java -Xmx4000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCHC.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/gulwani_fig1a.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-55b8104 [2018-06-18 13:23:26,174 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-18 13:23:26,176 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-18 13:23:26,194 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-18 13:23:26,194 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-18 13:23:26,195 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-18 13:23:26,196 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-18 13:23:26,201 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-18 13:23:26,202 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-18 13:23:26,204 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-18 13:23:26,205 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-18 13:23:26,205 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-18 13:23:26,206 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-18 13:23:26,210 INFO L177 SettingsManager]: ChcToBoogie provides no preferences, ignoring... [2018-06-18 13:23:26,211 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-18 13:23:26,211 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-18 13:23:26,213 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-18 13:23:26,226 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-18 13:23:26,227 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-18 13:23:26,228 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-18 13:23:26,229 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-18 13:23:26,231 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-18 13:23:26,231 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-18 13:23:26,231 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-18 13:23:26,235 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-18 13:23:26,235 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-18 13:23:26,236 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-18 13:23:26,237 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-18 13:23:26,238 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-18 13:23:26,241 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-18 13:23:26,242 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-18 13:23:26,243 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-18 13:23:26,243 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-18 13:23:26,244 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-18 13:23:26,244 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-18 13:23:26,244 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf [2018-06-18 13:23:26,265 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-18 13:23:26,265 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-18 13:23:26,265 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-18 13:23:26,266 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-18 13:23:26,269 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-18 13:23:26,270 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-18 13:23:26,270 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-18 13:23:26,270 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-18 13:23:26,270 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 13:23:26,270 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-18 13:23:26,271 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-18 13:23:26,271 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-18 13:23:26,271 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-18 13:23:26,271 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-18 13:23:26,271 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-18 13:23:26,271 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-18 13:23:26,272 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-18 13:23:26,274 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-18 13:23:26,274 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-18 13:23:26,331 INFO ]: Repository-Root is: /tmp [2018-06-18 13:23:26,346 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-18 13:23:26,351 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-18 13:23:26,353 INFO ]: Initializing SmtParser... [2018-06-18 13:23:26,353 INFO ]: SmtParser initialized [2018-06-18 13:23:26,354 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/gulwani_fig1a.c.smt2 [2018-06-18 13:23:26,355 INFO ]: Parsing .smt2 file as a set of Horn Clauses No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2018-06-18 13:23:26,445 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/gulwani_fig1a.c.smt2 unknown [2018-06-18 13:23:26,634 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/gulwani_fig1a.c.smt2 [2018-06-18 13:23:26,637 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-18 13:23:26,641 INFO ]: Walking toolchain with 4 elements. [2018-06-18 13:23:26,641 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-18 13:23:26,642 INFO ]: Initializing ChcToBoogie... [2018-06-18 13:23:26,642 INFO ]: ChcToBoogie initialized [2018-06-18 13:23:26,648 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 01:23:26" (1/1) ... [2018-06-18 13:23:26,712 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26 Unit [2018-06-18 13:23:26,712 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-18 13:23:26,715 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-18 13:23:26,715 INFO ]: Initializing Boogie Preprocessor... [2018-06-18 13:23:26,715 INFO ]: Boogie Preprocessor initialized [2018-06-18 13:23:26,737 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (1/1) ... [2018-06-18 13:23:26,737 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (1/1) ... [2018-06-18 13:23:26,747 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (1/1) ... [2018-06-18 13:23:26,747 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (1/1) ... [2018-06-18 13:23:26,751 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (1/1) ... [2018-06-18 13:23:26,752 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (1/1) ... [2018-06-18 13:23:26,753 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (1/1) ... [2018-06-18 13:23:26,756 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-18 13:23:26,756 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-18 13:23:26,756 INFO ]: Initializing RCFGBuilder... [2018-06-18 13:23:26,756 INFO ]: RCFGBuilder initialized [2018-06-18 13:23:26,757 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 13:23:26,770 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-18 13:23:26,770 INFO ]: Found specification of procedure False [2018-06-18 13:23:26,770 INFO ]: Found implementation of procedure False [2018-06-18 13:23:26,770 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-18 13:23:26,770 INFO ]: Found specification of procedure state [2018-06-18 13:23:26,770 INFO ]: Found implementation of procedure state [2018-06-18 13:23:26,770 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-18 13:23:26,770 INFO ]: Found specification of procedure Ultimate.START [2018-06-18 13:23:26,770 INFO ]: Found implementation of procedure Ultimate.START [2018-06-18 13:23:27,005 INFO ]: Using library mode [2018-06-18 13:23:27,005 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 01:23:27 BoogieIcfgContainer [2018-06-18 13:23:27,005 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-18 13:23:27,010 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-18 13:23:27,010 INFO ]: Initializing TraceAbstraction... [2018-06-18 13:23:27,013 INFO ]: TraceAbstraction initialized [2018-06-18 13:23:27,013 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 01:23:26" (1/3) ... [2018-06-18 13:23:27,014 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a5cc340 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 18.06 01:23:27, skipping insertion in model container [2018-06-18 13:23:27,014 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:23:26" (2/3) ... [2018-06-18 13:23:27,014 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a5cc340 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.06 01:23:27, skipping insertion in model container [2018-06-18 13:23:27,014 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 01:23:27" (3/3) ... [2018-06-18 13:23:27,016 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-18 13:23:27,026 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-18 13:23:27,035 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-18 13:23:27,073 INFO ]: Using default assertion order modulation [2018-06-18 13:23:27,074 INFO ]: Interprodecural is true [2018-06-18 13:23:27,074 INFO ]: Hoare is false [2018-06-18 13:23:27,074 INFO ]: Compute interpolants for FPandBP [2018-06-18 13:23:27,074 INFO ]: Backedges is TWOTRACK [2018-06-18 13:23:27,074 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-18 13:23:27,074 INFO ]: Difference is false [2018-06-18 13:23:27,074 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-18 13:23:27,074 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-18 13:23:27,088 INFO ]: Start isEmpty. Operand 13 states. [2018-06-18 13:23:27,098 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-18 13:23:27,098 INFO ]: Found error trace [2018-06-18 13:23:27,099 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:27,099 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:27,102 INFO ]: Analyzing trace with hash -683425083, now seen corresponding path program 1 times [2018-06-18 13:23:27,104 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:27,104 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:27,138 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:27,138 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:23:27,138 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:27,165 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:27,175 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:27,267 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-18 13:23:27,270 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-18 13:23:27,271 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-18 13:23:27,273 INFO ]: Interpolant automaton has 4 states [2018-06-18 13:23:27,290 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-18 13:23:27,291 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 13:23:27,293 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-18 13:23:27,405 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:27,405 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-18 13:23:27,406 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-18 13:23:27,407 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-18 13:23:27,407 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:27,418 INFO ]: With dead ends: 13 [2018-06-18 13:23:27,418 INFO ]: Without dead ends: 13 [2018-06-18 13:23:27,420 INFO ]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 13:23:27,433 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-18 13:23:27,453 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-18 13:23:27,455 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-18 13:23:27,455 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-18 13:23:27,457 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-18 13:23:27,457 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:27,457 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-18 13:23:27,457 INFO ]: Interpolant automaton has 4 states. [2018-06-18 13:23:27,457 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-18 13:23:27,459 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-18 13:23:27,459 INFO ]: Found error trace [2018-06-18 13:23:27,459 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:27,459 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:27,459 INFO ]: Analyzing trace with hash 204343015, now seen corresponding path program 1 times [2018-06-18 13:23:27,459 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:27,459 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:27,460 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:27,460 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:23:27,460 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:27,489 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:27,495 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:27,692 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 13:23:27,693 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:27,693 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:27,700 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:23:27,727 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:27,735 INFO ]: Computing forward predicates... [2018-06-18 13:23:28,018 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 13:23:28,053 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:28,053 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-06-18 13:23:28,054 INFO ]: Interpolant automaton has 6 states [2018-06-18 13:23:28,054 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-18 13:23:28,054 INFO ]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-18 13:23:28,054 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 6 states. [2018-06-18 13:23:28,224 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:28,224 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-18 13:23:28,226 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-18 13:23:28,226 INFO ]: Start accepts. Automaton has 6 states. Word has length 13 [2018-06-18 13:23:28,226 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:28,226 INFO ]: With dead ends: 15 [2018-06-18 13:23:28,226 INFO ]: Without dead ends: 15 [2018-06-18 13:23:28,227 INFO ]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-18 13:23:28,228 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-18 13:23:28,231 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-18 13:23:28,232 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-18 13:23:28,232 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-18 13:23:28,232 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-18 13:23:28,232 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:28,232 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-18 13:23:28,232 INFO ]: Interpolant automaton has 6 states. [2018-06-18 13:23:28,232 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-18 13:23:28,233 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-18 13:23:28,233 INFO ]: Found error trace [2018-06-18 13:23:28,233 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:28,233 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:28,233 INFO ]: Analyzing trace with hash -1649658231, now seen corresponding path program 2 times [2018-06-18 13:23:28,233 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:28,233 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:28,234 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:28,235 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:23:28,235 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:28,273 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:28,274 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:28,567 WARN ]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-06-18 13:23:28,723 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 13:23:28,723 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:28,723 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:28,733 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 13:23:28,770 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 13:23:28,770 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:28,773 INFO ]: Computing forward predicates... [2018-06-18 13:23:29,218 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 13:23:29,238 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:29,238 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2018-06-18 13:23:29,238 INFO ]: Interpolant automaton has 11 states [2018-06-18 13:23:29,239 INFO ]: Constructing interpolant automaton starting with 11 interpolants. [2018-06-18 13:23:29,239 INFO ]: CoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-06-18 13:23:29,239 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 11 states. [2018-06-18 13:23:29,401 WARN ]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2018-06-18 13:23:29,826 WARN ]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 20 [2018-06-18 13:23:29,841 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:29,841 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-18 13:23:29,842 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-18 13:23:29,842 INFO ]: Start accepts. Automaton has 11 states. Word has length 17 [2018-06-18 13:23:29,842 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:29,843 INFO ]: With dead ends: 17 [2018-06-18 13:23:29,843 INFO ]: Without dead ends: 17 [2018-06-18 13:23:29,843 INFO ]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2018-06-18 13:23:29,843 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-18 13:23:29,846 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-18 13:23:29,846 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-18 13:23:29,847 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-18 13:23:29,847 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-18 13:23:29,847 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:29,847 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-18 13:23:29,847 INFO ]: Interpolant automaton has 11 states. [2018-06-18 13:23:29,847 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-18 13:23:29,848 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-18 13:23:29,848 INFO ]: Found error trace [2018-06-18 13:23:29,848 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:29,848 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:29,848 INFO ]: Analyzing trace with hash 2119922091, now seen corresponding path program 3 times [2018-06-18 13:23:29,848 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:29,848 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:29,849 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:29,849 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:29,849 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:29,873 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:29,874 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:30,041 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 13:23:30,041 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:30,041 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:30,050 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 13:23:30,081 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-18 13:23:30,081 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:30,085 INFO ]: Computing forward predicates... [2018-06-18 13:23:30,271 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 13:23:30,302 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:30,302 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 12 [2018-06-18 13:23:30,302 INFO ]: Interpolant automaton has 12 states [2018-06-18 13:23:30,303 INFO ]: Constructing interpolant automaton starting with 12 interpolants. [2018-06-18 13:23:30,303 INFO ]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-06-18 13:23:30,303 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 12 states. [2018-06-18 13:23:30,530 WARN ]: Spent 190.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 26 [2018-06-18 13:23:30,733 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:30,733 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-18 13:23:30,733 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-18 13:23:30,733 INFO ]: Start accepts. Automaton has 12 states. Word has length 21 [2018-06-18 13:23:30,733 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:30,734 INFO ]: With dead ends: 19 [2018-06-18 13:23:30,734 INFO ]: Without dead ends: 19 [2018-06-18 13:23:30,734 INFO ]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2018-06-18 13:23:30,734 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-18 13:23:30,738 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-18 13:23:30,738 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-18 13:23:30,739 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-18 13:23:30,739 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-18 13:23:30,739 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:30,739 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-18 13:23:30,739 INFO ]: Interpolant automaton has 12 states. [2018-06-18 13:23:30,739 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-18 13:23:30,740 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-18 13:23:30,740 INFO ]: Found error trace [2018-06-18 13:23:30,740 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:30,740 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:30,740 INFO ]: Analyzing trace with hash 1762711629, now seen corresponding path program 4 times [2018-06-18 13:23:30,740 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:30,740 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:30,741 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:30,741 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:30,741 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:30,764 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:30,765 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:30,946 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 13:23:30,946 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:30,946 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:30,953 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-18 13:23:30,974 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-18 13:23:30,974 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:30,977 INFO ]: Computing forward predicates... [2018-06-18 13:23:31,469 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 13:23:31,490 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:31,490 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2018-06-18 13:23:31,490 INFO ]: Interpolant automaton has 14 states [2018-06-18 13:23:31,490 INFO ]: Constructing interpolant automaton starting with 14 interpolants. [2018-06-18 13:23:31,490 INFO ]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2018-06-18 13:23:31,490 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 14 states. [2018-06-18 13:23:31,850 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:31,850 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-18 13:23:31,855 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-18 13:23:31,855 INFO ]: Start accepts. Automaton has 14 states. Word has length 25 [2018-06-18 13:23:31,855 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:31,856 INFO ]: With dead ends: 21 [2018-06-18 13:23:31,856 INFO ]: Without dead ends: 21 [2018-06-18 13:23:31,856 INFO ]: 0 DeclaredPredicates, 41 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2018-06-18 13:23:31,856 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-18 13:23:31,859 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-18 13:23:31,859 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-18 13:23:31,860 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-18 13:23:31,860 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-18 13:23:31,860 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:31,860 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-18 13:23:31,860 INFO ]: Interpolant automaton has 14 states. [2018-06-18 13:23:31,860 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-18 13:23:31,866 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-18 13:23:31,866 INFO ]: Found error trace [2018-06-18 13:23:31,867 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:31,867 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:31,867 INFO ]: Analyzing trace with hash 853117551, now seen corresponding path program 5 times [2018-06-18 13:23:31,867 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:31,867 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:31,868 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:31,868 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:31,868 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:31,892 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:31,893 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:32,114 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 13:23:32,114 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:32,114 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:32,120 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-18 13:23:32,222 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-18 13:23:32,223 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:32,226 INFO ]: Computing forward predicates... [2018-06-18 13:23:32,647 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 13:23:32,667 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:32,667 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 16 [2018-06-18 13:23:32,667 INFO ]: Interpolant automaton has 16 states [2018-06-18 13:23:32,667 INFO ]: Constructing interpolant automaton starting with 16 interpolants. [2018-06-18 13:23:32,667 INFO ]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2018-06-18 13:23:32,668 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 16 states. [2018-06-18 13:23:32,801 WARN ]: Spent 107.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 32 [2018-06-18 13:23:32,954 WARN ]: Spent 132.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2018-06-18 13:23:33,256 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:33,257 INFO ]: Finished difference Result 23 states and 24 transitions. [2018-06-18 13:23:33,258 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-06-18 13:23:33,258 INFO ]: Start accepts. Automaton has 16 states. Word has length 29 [2018-06-18 13:23:33,258 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:33,258 INFO ]: With dead ends: 23 [2018-06-18 13:23:33,259 INFO ]: Without dead ends: 23 [2018-06-18 13:23:33,259 INFO ]: 0 DeclaredPredicates, 48 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=117, Invalid=345, Unknown=0, NotChecked=0, Total=462 [2018-06-18 13:23:33,259 INFO ]: Start minimizeSevpa. Operand 23 states. [2018-06-18 13:23:33,262 INFO ]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-06-18 13:23:33,262 INFO ]: Start removeUnreachable. Operand 23 states. [2018-06-18 13:23:33,263 INFO ]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-06-18 13:23:33,263 INFO ]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 29 [2018-06-18 13:23:33,263 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:33,263 INFO ]: Abstraction has 23 states and 24 transitions. [2018-06-18 13:23:33,263 INFO ]: Interpolant automaton has 16 states. [2018-06-18 13:23:33,263 INFO ]: Start isEmpty. Operand 23 states and 24 transitions. [2018-06-18 13:23:33,264 INFO ]: Finished isEmpty. Found accepting run of length 34 [2018-06-18 13:23:33,264 INFO ]: Found error trace [2018-06-18 13:23:33,264 INFO ]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:33,264 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:33,265 INFO ]: Analyzing trace with hash -1661294575, now seen corresponding path program 6 times [2018-06-18 13:23:33,265 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:33,265 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:33,265 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:33,265 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:33,265 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:33,297 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:33,298 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:33,625 INFO ]: Checked inductivity of 78 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-06-18 13:23:33,625 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:33,625 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:33,634 INFO ]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-06-18 13:23:33,693 INFO ]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-06-18 13:23:33,693 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:33,696 INFO ]: Computing forward predicates... [2018-06-18 13:23:33,827 INFO ]: Checked inductivity of 78 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-06-18 13:23:33,858 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:33,858 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 18 [2018-06-18 13:23:33,859 INFO ]: Interpolant automaton has 18 states [2018-06-18 13:23:33,859 INFO ]: Constructing interpolant automaton starting with 18 interpolants. [2018-06-18 13:23:33,859 INFO ]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2018-06-18 13:23:33,859 INFO ]: Start difference. First operand 23 states and 24 transitions. Second operand 18 states. [2018-06-18 13:23:34,019 WARN ]: Spent 138.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 33 [2018-06-18 13:23:34,596 WARN ]: Spent 121.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 32 [2018-06-18 13:23:34,663 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:34,663 INFO ]: Finished difference Result 25 states and 26 transitions. [2018-06-18 13:23:34,664 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-06-18 13:23:34,664 INFO ]: Start accepts. Automaton has 18 states. Word has length 33 [2018-06-18 13:23:34,664 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:34,665 INFO ]: With dead ends: 25 [2018-06-18 13:23:34,665 INFO ]: Without dead ends: 25 [2018-06-18 13:23:34,665 INFO ]: 0 DeclaredPredicates, 55 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=149, Invalid=451, Unknown=0, NotChecked=0, Total=600 [2018-06-18 13:23:34,665 INFO ]: Start minimizeSevpa. Operand 25 states. [2018-06-18 13:23:34,669 INFO ]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-06-18 13:23:34,669 INFO ]: Start removeUnreachable. Operand 25 states. [2018-06-18 13:23:34,670 INFO ]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-06-18 13:23:34,670 INFO ]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 33 [2018-06-18 13:23:34,670 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:34,670 INFO ]: Abstraction has 25 states and 26 transitions. [2018-06-18 13:23:34,670 INFO ]: Interpolant automaton has 18 states. [2018-06-18 13:23:34,670 INFO ]: Start isEmpty. Operand 25 states and 26 transitions. [2018-06-18 13:23:34,671 INFO ]: Finished isEmpty. Found accepting run of length 38 [2018-06-18 13:23:34,671 INFO ]: Found error trace [2018-06-18 13:23:34,671 INFO ]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:34,671 INFO ]: === Iteration 8 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:34,672 INFO ]: Analyzing trace with hash -1494134477, now seen corresponding path program 7 times [2018-06-18 13:23:34,672 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:34,672 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:34,672 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:34,672 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:34,672 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:34,725 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:34,726 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:35,342 WARN ]: Spent 398.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2018-06-18 13:23:35,643 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-18 13:23:35,643 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:35,643 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:35,650 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:23:35,689 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:35,694 INFO ]: Computing forward predicates... [2018-06-18 13:23:35,899 WARN ]: Spent 162.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2018-06-18 13:23:36,329 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-18 13:23:36,350 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:36,350 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2018-06-18 13:23:36,350 INFO ]: Interpolant automaton has 28 states [2018-06-18 13:23:36,351 INFO ]: Constructing interpolant automaton starting with 28 interpolants. [2018-06-18 13:23:36,351 INFO ]: CoverageRelationStatistics Valid=94, Invalid=662, Unknown=0, NotChecked=0, Total=756 [2018-06-18 13:23:36,351 INFO ]: Start difference. First operand 25 states and 26 transitions. Second operand 28 states. [2018-06-18 13:23:36,658 WARN ]: Spent 269.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 51 [2018-06-18 13:23:36,880 WARN ]: Spent 107.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 28 [2018-06-18 13:23:37,053 WARN ]: Spent 152.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 30 [2018-06-18 13:23:37,204 WARN ]: Spent 122.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 29 [2018-06-18 13:23:37,871 WARN ]: Spent 340.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 48 [2018-06-18 13:23:37,902 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:37,902 INFO ]: Finished difference Result 27 states and 28 transitions. [2018-06-18 13:23:37,903 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-06-18 13:23:37,903 INFO ]: Start accepts. Automaton has 28 states. Word has length 37 [2018-06-18 13:23:37,903 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:37,904 INFO ]: With dead ends: 27 [2018-06-18 13:23:37,904 INFO ]: Without dead ends: 27 [2018-06-18 13:23:37,904 INFO ]: 0 DeclaredPredicates, 62 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=247, Invalid=1013, Unknown=0, NotChecked=0, Total=1260 [2018-06-18 13:23:37,905 INFO ]: Start minimizeSevpa. Operand 27 states. [2018-06-18 13:23:37,908 INFO ]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-06-18 13:23:37,908 INFO ]: Start removeUnreachable. Operand 27 states. [2018-06-18 13:23:37,909 INFO ]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-06-18 13:23:37,909 INFO ]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 37 [2018-06-18 13:23:37,909 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:37,909 INFO ]: Abstraction has 27 states and 28 transitions. [2018-06-18 13:23:37,909 INFO ]: Interpolant automaton has 28 states. [2018-06-18 13:23:37,909 INFO ]: Start isEmpty. Operand 27 states and 28 transitions. [2018-06-18 13:23:37,910 INFO ]: Finished isEmpty. Found accepting run of length 42 [2018-06-18 13:23:37,910 INFO ]: Found error trace [2018-06-18 13:23:37,910 INFO ]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:37,910 INFO ]: === Iteration 9 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:37,910 INFO ]: Analyzing trace with hash 1618126293, now seen corresponding path program 8 times [2018-06-18 13:23:37,910 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:37,910 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:37,911 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:37,911 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:23:37,911 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:37,974 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:37,975 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:39,138 WARN ]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-06-18 13:23:39,189 INFO ]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-06-18 13:23:39,190 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:39,190 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:39,197 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 13:23:39,243 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 13:23:39,243 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:39,248 INFO ]: Computing forward predicates... [2018-06-18 13:23:40,349 WARN ]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-06-18 13:23:41,186 INFO ]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-06-18 13:23:41,207 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:41,207 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 30 [2018-06-18 13:23:41,207 INFO ]: Interpolant automaton has 30 states [2018-06-18 13:23:41,207 INFO ]: Constructing interpolant automaton starting with 30 interpolants. [2018-06-18 13:23:41,208 INFO ]: CoverageRelationStatistics Valid=92, Invalid=778, Unknown=0, NotChecked=0, Total=870 [2018-06-18 13:23:41,208 INFO ]: Start difference. First operand 27 states and 28 transitions. Second operand 30 states. [2018-06-18 13:23:41,481 WARN ]: Spent 213.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 54 [2018-06-18 13:23:41,752 WARN ]: Spent 110.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 32 [2018-06-18 13:23:41,907 WARN ]: Spent 109.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 35 [2018-06-18 13:23:42,154 WARN ]: Spent 103.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 37 [2018-06-18 13:23:42,349 WARN ]: Spent 134.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 40 [2018-06-18 13:23:42,512 WARN ]: Spent 125.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 36 [2018-06-18 13:23:42,805 WARN ]: Spent 187.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 42 [2018-06-18 13:23:42,846 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:42,846 INFO ]: Finished difference Result 29 states and 30 transitions. [2018-06-18 13:23:42,847 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-06-18 13:23:42,847 INFO ]: Start accepts. Automaton has 30 states. Word has length 41 [2018-06-18 13:23:42,847 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:42,848 INFO ]: With dead ends: 29 [2018-06-18 13:23:42,848 INFO ]: Without dead ends: 29 [2018-06-18 13:23:42,849 INFO ]: 0 DeclaredPredicates, 69 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=279, Invalid=1203, Unknown=0, NotChecked=0, Total=1482 [2018-06-18 13:23:42,849 INFO ]: Start minimizeSevpa. Operand 29 states. [2018-06-18 13:23:42,852 INFO ]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-06-18 13:23:42,852 INFO ]: Start removeUnreachable. Operand 29 states. [2018-06-18 13:23:42,853 INFO ]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-06-18 13:23:42,854 INFO ]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 41 [2018-06-18 13:23:42,854 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:42,854 INFO ]: Abstraction has 29 states and 30 transitions. [2018-06-18 13:23:42,854 INFO ]: Interpolant automaton has 30 states. [2018-06-18 13:23:42,854 INFO ]: Start isEmpty. Operand 29 states and 30 transitions. [2018-06-18 13:23:42,855 INFO ]: Finished isEmpty. Found accepting run of length 46 [2018-06-18 13:23:42,855 INFO ]: Found error trace [2018-06-18 13:23:42,855 INFO ]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:42,855 INFO ]: === Iteration 10 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:42,855 INFO ]: Analyzing trace with hash 996918775, now seen corresponding path program 9 times [2018-06-18 13:23:42,855 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:42,855 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:42,856 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:42,856 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:42,856 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:42,913 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:42,914 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:43,553 INFO ]: Checked inductivity of 171 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-06-18 13:23:43,553 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:43,553 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:43,560 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 13:23:43,612 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-06-18 13:23:43,612 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:43,622 INFO ]: Computing forward predicates... [2018-06-18 13:23:44,407 INFO ]: Checked inductivity of 171 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-06-18 13:23:44,427 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:44,427 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2018-06-18 13:23:44,427 INFO ]: Interpolant automaton has 28 states [2018-06-18 13:23:44,427 INFO ]: Constructing interpolant automaton starting with 28 interpolants. [2018-06-18 13:23:44,427 INFO ]: CoverageRelationStatistics Valid=84, Invalid=672, Unknown=0, NotChecked=0, Total=756 [2018-06-18 13:23:44,428 INFO ]: Start difference. First operand 29 states and 30 transitions. Second operand 28 states. [2018-06-18 13:23:44,846 WARN ]: Spent 382.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 59 [2018-06-18 13:23:45,129 WARN ]: Spent 105.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 31 [2018-06-18 13:23:45,265 WARN ]: Spent 111.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 35 [2018-06-18 13:23:45,660 WARN ]: Spent 113.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 40 [2018-06-18 13:23:45,805 WARN ]: Spent 120.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 37 [2018-06-18 13:23:45,985 WARN ]: Spent 156.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 39 [2018-06-18 13:23:46,309 WARN ]: Spent 292.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 54 [2018-06-18 13:23:46,352 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:46,352 INFO ]: Finished difference Result 31 states and 32 transitions. [2018-06-18 13:23:46,352 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-06-18 13:23:46,352 INFO ]: Start accepts. Automaton has 28 states. Word has length 45 [2018-06-18 13:23:46,353 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:46,353 INFO ]: With dead ends: 31 [2018-06-18 13:23:46,353 INFO ]: Without dead ends: 31 [2018-06-18 13:23:46,354 INFO ]: 0 DeclaredPredicates, 76 GetRequests, 36 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=283, Invalid=1123, Unknown=0, NotChecked=0, Total=1406 [2018-06-18 13:23:46,354 INFO ]: Start minimizeSevpa. Operand 31 states. [2018-06-18 13:23:46,357 INFO ]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-06-18 13:23:46,357 INFO ]: Start removeUnreachable. Operand 31 states. [2018-06-18 13:23:46,360 INFO ]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-06-18 13:23:46,360 INFO ]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 45 [2018-06-18 13:23:46,360 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:46,360 INFO ]: Abstraction has 31 states and 32 transitions. [2018-06-18 13:23:46,360 INFO ]: Interpolant automaton has 28 states. [2018-06-18 13:23:46,360 INFO ]: Start isEmpty. Operand 31 states and 32 transitions. [2018-06-18 13:23:46,361 INFO ]: Finished isEmpty. Found accepting run of length 50 [2018-06-18 13:23:46,361 INFO ]: Found error trace [2018-06-18 13:23:46,361 INFO ]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:46,361 INFO ]: === Iteration 11 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:46,361 INFO ]: Analyzing trace with hash -570306151, now seen corresponding path program 10 times [2018-06-18 13:23:46,361 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:46,361 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:46,362 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:46,362 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:46,362 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:46,426 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:46,427 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:47,028 WARN ]: Spent 438.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 7 [2018-06-18 13:23:47,360 WARN ]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2018-06-18 13:23:47,769 INFO ]: Checked inductivity of 210 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-06-18 13:23:47,769 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:47,769 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:47,774 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-18 13:23:47,809 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-18 13:23:47,809 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:47,814 INFO ]: Computing forward predicates... [2018-06-18 13:23:48,513 INFO ]: Checked inductivity of 210 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-06-18 13:23:48,533 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:48,533 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 31 [2018-06-18 13:23:48,534 INFO ]: Interpolant automaton has 31 states [2018-06-18 13:23:48,534 INFO ]: Constructing interpolant automaton starting with 31 interpolants. [2018-06-18 13:23:48,534 INFO ]: CoverageRelationStatistics Valid=100, Invalid=830, Unknown=0, NotChecked=0, Total=930 [2018-06-18 13:23:48,535 INFO ]: Start difference. First operand 31 states and 32 transitions. Second operand 31 states. [2018-06-18 13:23:48,928 WARN ]: Spent 353.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 58 [2018-06-18 13:23:49,207 WARN ]: Spent 120.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 33 [2018-06-18 13:23:49,348 WARN ]: Spent 110.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 37 [2018-06-18 13:23:49,601 WARN ]: Spent 106.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 39 [2018-06-18 13:23:49,771 WARN ]: Spent 115.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 41 [2018-06-18 13:23:49,962 WARN ]: Spent 141.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 39 [2018-06-18 13:23:50,165 WARN ]: Spent 157.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 38 [2018-06-18 13:23:50,294 WARN ]: Spent 104.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 38 [2018-06-18 13:23:50,625 WARN ]: Spent 295.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 56 [2018-06-18 13:23:50,655 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:50,655 INFO ]: Finished difference Result 33 states and 34 transitions. [2018-06-18 13:23:50,655 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-06-18 13:23:50,655 INFO ]: Start accepts. Automaton has 31 states. Word has length 49 [2018-06-18 13:23:50,656 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:50,656 INFO ]: With dead ends: 33 [2018-06-18 13:23:50,656 INFO ]: Without dead ends: 33 [2018-06-18 13:23:50,657 INFO ]: 0 DeclaredPredicates, 83 GetRequests, 38 SyntacticMatches, 5 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=335, Invalid=1387, Unknown=0, NotChecked=0, Total=1722 [2018-06-18 13:23:50,657 INFO ]: Start minimizeSevpa. Operand 33 states. [2018-06-18 13:23:50,661 INFO ]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-06-18 13:23:50,661 INFO ]: Start removeUnreachable. Operand 33 states. [2018-06-18 13:23:50,662 INFO ]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-06-18 13:23:50,662 INFO ]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 49 [2018-06-18 13:23:50,662 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:50,662 INFO ]: Abstraction has 33 states and 34 transitions. [2018-06-18 13:23:50,662 INFO ]: Interpolant automaton has 31 states. [2018-06-18 13:23:50,662 INFO ]: Start isEmpty. Operand 33 states and 34 transitions. [2018-06-18 13:23:50,664 INFO ]: Finished isEmpty. Found accepting run of length 54 [2018-06-18 13:23:50,664 INFO ]: Found error trace [2018-06-18 13:23:50,664 INFO ]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:50,664 INFO ]: === Iteration 12 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:50,665 INFO ]: Analyzing trace with hash 1955719355, now seen corresponding path program 11 times [2018-06-18 13:23:50,665 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:50,665 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:50,665 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:50,665 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:50,665 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:50,725 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:50,725 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:51,884 INFO ]: Checked inductivity of 253 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-06-18 13:23:51,884 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:23:51,884 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:23:51,890 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-18 13:23:51,939 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-06-18 13:23:51,939 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:51,945 INFO ]: Computing forward predicates... [2018-06-18 13:23:52,341 WARN ]: Spent 137.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 29 [2018-06-18 13:23:54,452 WARN ]: Spent 101.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 27 [2018-06-18 13:23:55,353 WARN ]: Spent 182.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2018-06-18 13:23:55,403 INFO ]: Checked inductivity of 253 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-06-18 13:23:55,431 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:23:55,431 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 43 [2018-06-18 13:23:55,432 INFO ]: Interpolant automaton has 43 states [2018-06-18 13:23:55,432 INFO ]: Constructing interpolant automaton starting with 43 interpolants. [2018-06-18 13:23:55,432 INFO ]: CoverageRelationStatistics Valid=170, Invalid=1636, Unknown=0, NotChecked=0, Total=1806 [2018-06-18 13:23:55,432 INFO ]: Start difference. First operand 33 states and 34 transitions. Second operand 43 states. [2018-06-18 13:23:56,260 WARN ]: Spent 778.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 68 [2018-06-18 13:23:56,409 WARN ]: Spent 106.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 34 [2018-06-18 13:23:56,670 WARN ]: Spent 183.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 30 [2018-06-18 13:23:56,886 WARN ]: Spent 184.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 34 [2018-06-18 13:23:57,024 WARN ]: Spent 107.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 34 [2018-06-18 13:23:57,287 WARN ]: Spent 152.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 37 [2018-06-18 13:23:57,558 WARN ]: Spent 237.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 36 [2018-06-18 13:23:57,900 WARN ]: Spent 305.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 49 [2018-06-18 13:23:58,160 WARN ]: Spent 219.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 53 [2018-06-18 13:23:58,451 WARN ]: Spent 250.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 60 [2018-06-18 13:23:58,692 WARN ]: Spent 199.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 59 [2018-06-18 13:23:59,133 WARN ]: Spent 399.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 64 [2018-06-18 13:23:59,172 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:23:59,172 INFO ]: Finished difference Result 35 states and 36 transitions. [2018-06-18 13:23:59,173 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-06-18 13:23:59,173 INFO ]: Start accepts. Automaton has 43 states. Word has length 53 [2018-06-18 13:23:59,173 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:23:59,174 INFO ]: With dead ends: 35 [2018-06-18 13:23:59,174 INFO ]: Without dead ends: 35 [2018-06-18 13:23:59,174 INFO ]: 0 DeclaredPredicates, 90 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=499, Invalid=2471, Unknown=0, NotChecked=0, Total=2970 [2018-06-18 13:23:59,175 INFO ]: Start minimizeSevpa. Operand 35 states. [2018-06-18 13:23:59,179 INFO ]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-06-18 13:23:59,179 INFO ]: Start removeUnreachable. Operand 35 states. [2018-06-18 13:23:59,180 INFO ]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2018-06-18 13:23:59,180 INFO ]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 53 [2018-06-18 13:23:59,180 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:23:59,180 INFO ]: Abstraction has 35 states and 36 transitions. [2018-06-18 13:23:59,180 INFO ]: Interpolant automaton has 43 states. [2018-06-18 13:23:59,180 INFO ]: Start isEmpty. Operand 35 states and 36 transitions. [2018-06-18 13:23:59,181 INFO ]: Finished isEmpty. Found accepting run of length 58 [2018-06-18 13:23:59,181 INFO ]: Found error trace [2018-06-18 13:23:59,181 INFO ]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:23:59,181 INFO ]: === Iteration 13 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:23:59,181 INFO ]: Analyzing trace with hash -2085541027, now seen corresponding path program 12 times [2018-06-18 13:23:59,181 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:23:59,181 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:23:59,182 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:59,182 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:23:59,182 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:23:59,243 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:23:59,244 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:23:59,814 WARN ]: Spent 109.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 30 [2018-06-18 13:24:00,442 INFO ]: Checked inductivity of 300 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-06-18 13:24:00,442 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:24:00,442 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:24:00,448 INFO ]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-06-18 13:24:00,498 INFO ]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-06-18 13:24:00,498 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:24:00,509 INFO ]: Computing forward predicates... [2018-06-18 13:24:01,229 WARN ]: Spent 404.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 28 [2018-06-18 13:24:01,403 WARN ]: Spent 138.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 29 [2018-06-18 13:24:05,374 INFO ]: Checked inductivity of 300 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-06-18 13:24:05,394 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:24:05,394 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 46 [2018-06-18 13:24:05,394 INFO ]: Interpolant automaton has 46 states [2018-06-18 13:24:05,395 INFO ]: Constructing interpolant automaton starting with 46 interpolants. [2018-06-18 13:24:05,395 INFO ]: CoverageRelationStatistics Valid=171, Invalid=1899, Unknown=0, NotChecked=0, Total=2070 [2018-06-18 13:24:05,395 INFO ]: Start difference. First operand 35 states and 36 transitions. Second operand 46 states. [2018-06-18 13:24:06,462 WARN ]: Spent 933.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 78 [2018-06-18 13:24:06,635 WARN ]: Spent 118.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 30 [2018-06-18 13:24:06,848 WARN ]: Spent 179.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 28 [2018-06-18 13:24:07,004 WARN ]: Spent 123.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 28 [2018-06-18 13:24:07,155 WARN ]: Spent 115.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 29 [2018-06-18 13:24:07,346 WARN ]: Spent 137.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 34 [2018-06-18 13:24:07,532 WARN ]: Spent 146.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 34 [2018-06-18 13:24:07,812 WARN ]: Spent 242.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 45 [2018-06-18 13:24:08,074 WARN ]: Spent 207.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 51 [2018-06-18 13:24:08,371 WARN ]: Spent 255.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 55 [2018-06-18 13:24:08,710 WARN ]: Spent 291.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 59 [2018-06-18 13:24:09,101 WARN ]: Spent 356.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2018-06-18 13:24:09,976 WARN ]: Spent 823.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 73 [2018-06-18 13:24:10,041 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:24:10,041 INFO ]: Finished difference Result 37 states and 38 transitions. [2018-06-18 13:24:10,042 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-06-18 13:24:10,042 INFO ]: Start accepts. Automaton has 46 states. Word has length 57 [2018-06-18 13:24:10,042 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:24:10,043 INFO ]: With dead ends: 37 [2018-06-18 13:24:10,043 INFO ]: Without dead ends: 37 [2018-06-18 13:24:10,044 INFO ]: 0 DeclaredPredicates, 97 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=563, Invalid=2859, Unknown=0, NotChecked=0, Total=3422 [2018-06-18 13:24:10,044 INFO ]: Start minimizeSevpa. Operand 37 states. [2018-06-18 13:24:10,050 INFO ]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-06-18 13:24:10,050 INFO ]: Start removeUnreachable. Operand 37 states. [2018-06-18 13:24:10,053 INFO ]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-06-18 13:24:10,053 INFO ]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 57 [2018-06-18 13:24:10,053 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:24:10,053 INFO ]: Abstraction has 37 states and 38 transitions. [2018-06-18 13:24:10,053 INFO ]: Interpolant automaton has 46 states. [2018-06-18 13:24:10,053 INFO ]: Start isEmpty. Operand 37 states and 38 transitions. [2018-06-18 13:24:10,058 INFO ]: Finished isEmpty. Found accepting run of length 62 [2018-06-18 13:24:10,058 INFO ]: Found error trace [2018-06-18 13:24:10,058 INFO ]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:24:10,058 INFO ]: === Iteration 14 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:24:10,058 INFO ]: Analyzing trace with hash 976009599, now seen corresponding path program 13 times [2018-06-18 13:24:10,058 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:24:10,058 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:24:10,059 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:24:10,059 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:24:10,059 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:24:10,126 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:24:10,127 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:24:10,432 WARN ]: Spent 121.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 12 [2018-06-18 13:24:11,185 INFO ]: Checked inductivity of 351 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-06-18 13:24:11,185 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:24:11,215 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:24:11,220 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:24:11,273 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:24:11,279 INFO ]: Computing forward predicates... [2018-06-18 13:24:11,542 WARN ]: Spent 192.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 16 [2018-06-18 13:24:11,799 WARN ]: Spent 221.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 34 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown