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_e2_704.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-55b8104 [2018-06-18 16:08:34,368 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-18 16:08:34,370 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-18 16:08:34,384 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-18 16:08:34,384 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-18 16:08:34,385 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-18 16:08:34,386 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-18 16:08:34,388 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-18 16:08:34,389 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-18 16:08:34,390 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-18 16:08:34,391 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-18 16:08:34,391 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-18 16:08:34,392 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-18 16:08:34,393 INFO L177 SettingsManager]: ChcToBoogie provides no preferences, ignoring... [2018-06-18 16:08:34,393 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-18 16:08:34,394 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-18 16:08:34,405 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-18 16:08:34,407 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-18 16:08:34,409 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-18 16:08:34,410 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-18 16:08:34,411 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-18 16:08:34,414 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-18 16:08:34,419 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-18 16:08:34,419 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-18 16:08:34,422 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-18 16:08:34,423 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-18 16:08:34,424 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-18 16:08:34,425 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-18 16:08:34,426 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-18 16:08:34,426 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-18 16:08:34,426 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-18 16:08:34,433 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-18 16:08:34,433 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-18 16:08:34,434 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-18 16:08:34,435 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-18 16:08:34,435 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf [2018-06-18 16:08:34,454 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-18 16:08:34,455 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-18 16:08:34,455 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-18 16:08:34,455 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-18 16:08:34,457 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-18 16:08:34,457 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-18 16:08:34,457 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-18 16:08:34,457 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-18 16:08:34,457 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 16:08:34,458 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-18 16:08:34,458 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-18 16:08:34,458 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-18 16:08:34,458 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-18 16:08:34,458 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-18 16:08:34,458 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-18 16:08:34,459 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-18 16:08:34,459 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-18 16:08:34,460 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-18 16:08:34,460 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-18 16:08:34,505 INFO ]: Repository-Root is: /tmp [2018-06-18 16:08:34,523 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-18 16:08:34,530 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-18 16:08:34,531 INFO ]: Initializing SmtParser... [2018-06-18 16:08:34,531 INFO ]: SmtParser initialized [2018-06-18 16:08:34,532 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e2_704.smt2 [2018-06-18 16:08:34,533 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 16:08:34,625 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e2_704.smt2 unknown [2018-06-18 16:08:35,044 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e2_704.smt2 [2018-06-18 16:08:35,049 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-18 16:08:35,055 INFO ]: Walking toolchain with 4 elements. [2018-06-18 16:08:35,055 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-18 16:08:35,055 INFO ]: Initializing ChcToBoogie... [2018-06-18 16:08:35,055 INFO ]: ChcToBoogie initialized [2018-06-18 16:08:35,062 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 04:08:35" (1/1) ... [2018-06-18 16:08:35,163 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35 Unit [2018-06-18 16:08:35,163 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-18 16:08:35,164 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-18 16:08:35,164 INFO ]: Initializing Boogie Preprocessor... [2018-06-18 16:08:35,164 INFO ]: Boogie Preprocessor initialized [2018-06-18 16:08:35,187 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (1/1) ... [2018-06-18 16:08:35,187 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (1/1) ... [2018-06-18 16:08:35,198 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (1/1) ... [2018-06-18 16:08:35,198 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (1/1) ... [2018-06-18 16:08:35,203 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (1/1) ... [2018-06-18 16:08:35,204 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (1/1) ... [2018-06-18 16:08:35,207 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (1/1) ... [2018-06-18 16:08:35,210 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-18 16:08:35,210 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-18 16:08:35,210 INFO ]: Initializing RCFGBuilder... [2018-06-18 16:08:35,210 INFO ]: RCFGBuilder initialized [2018-06-18 16:08:35,211 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2018-06-18 16:08:35,261 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-18 16:08:35,261 INFO ]: Found specification of procedure False [2018-06-18 16:08:35,261 INFO ]: Found implementation of procedure False [2018-06-18 16:08:35,261 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-18 16:08:35,261 INFO ]: Found specification of procedure state [2018-06-18 16:08:35,261 INFO ]: Found implementation of procedure state [2018-06-18 16:08:35,261 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-18 16:08:35,261 INFO ]: Found specification of procedure Ultimate.START [2018-06-18 16:08:35,261 INFO ]: Found implementation of procedure Ultimate.START Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 16:08:35,631 INFO ]: Using library mode [2018-06-18 16:08:35,632 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 04:08:35 BoogieIcfgContainer [2018-06-18 16:08:35,632 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-18 16:08:35,634 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-18 16:08:35,634 INFO ]: Initializing TraceAbstraction... [2018-06-18 16:08:35,637 INFO ]: TraceAbstraction initialized [2018-06-18 16:08:35,637 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 04:08:35" (1/3) ... [2018-06-18 16:08:35,638 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@432d9686 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 18.06 04:08:35, skipping insertion in model container [2018-06-18 16:08:35,638 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:08:35" (2/3) ... [2018-06-18 16:08:35,638 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@432d9686 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.06 04:08:35, skipping insertion in model container [2018-06-18 16:08:35,638 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 04:08:35" (3/3) ... [2018-06-18 16:08:35,640 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-18 16:08:35,650 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-18 16:08:35,659 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-18 16:08:35,712 INFO ]: Using default assertion order modulation [2018-06-18 16:08:35,713 INFO ]: Interprodecural is true [2018-06-18 16:08:35,713 INFO ]: Hoare is false [2018-06-18 16:08:35,713 INFO ]: Compute interpolants for FPandBP [2018-06-18 16:08:35,713 INFO ]: Backedges is TWOTRACK [2018-06-18 16:08:35,713 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-18 16:08:35,713 INFO ]: Difference is false [2018-06-18 16:08:35,713 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-18 16:08:35,713 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-18 16:08:35,735 INFO ]: Start isEmpty. Operand 13 states. [2018-06-18 16:08:35,752 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-18 16:08:35,752 INFO ]: Found error trace [2018-06-18 16:08:35,753 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:08:35,754 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:08:35,760 INFO ]: Analyzing trace with hash -683425083, now seen corresponding path program 1 times [2018-06-18 16:08:35,763 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:08:35,763 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:08:35,806 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:35,806 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:08:35,806 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:35,918 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:35,934 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:08:36,111 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-18 16:08:36,113 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-18 16:08:36,113 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-18 16:08:36,115 INFO ]: Interpolant automaton has 4 states [2018-06-18 16:08:36,131 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-18 16:08:36,131 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 16:08:36,133 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-18 16:08:36,282 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:08:36,282 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-18 16:08:36,283 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-18 16:08:36,284 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-18 16:08:36,284 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:08:36,297 INFO ]: With dead ends: 13 [2018-06-18 16:08:36,297 INFO ]: Without dead ends: 13 [2018-06-18 16:08:36,299 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 16:08:36,316 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-18 16:08:36,336 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-18 16:08:36,337 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-18 16:08:36,341 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-18 16:08:36,342 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-18 16:08:36,342 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:08:36,342 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-18 16:08:36,342 INFO ]: Interpolant automaton has 4 states. [2018-06-18 16:08:36,342 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-18 16:08:36,343 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-18 16:08:36,343 INFO ]: Found error trace [2018-06-18 16:08:36,344 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:08:36,344 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:08:36,344 INFO ]: Analyzing trace with hash 204343015, now seen corresponding path program 1 times [2018-06-18 16:08:36,344 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:08:36,344 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:08:36,345 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:36,345 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:08:36,345 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:36,457 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:36,458 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:08:37,128 WARN ]: Spent 451.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2018-06-18 16:08:37,336 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 16:08:37,337 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:08:37,337 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 16:08:37,344 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:08:37,475 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:37,487 INFO ]: Computing forward predicates... [2018-06-18 16:08:37,966 WARN ]: Spent 210.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 10 [2018-06-18 16:08:38,054 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 16:08:38,091 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:08:38,091 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2018-06-18 16:08:38,091 INFO ]: Interpolant automaton has 8 states [2018-06-18 16:08:38,092 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-18 16:08:38,092 INFO ]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-06-18 16:08:38,092 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 8 states. [2018-06-18 16:08:38,378 WARN ]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-06-18 16:08:38,731 WARN ]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2018-06-18 16:08:39,171 WARN ]: Spent 262.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 9 [2018-06-18 16:08:39,263 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:08:39,263 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-18 16:08:39,266 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-18 16:08:39,266 INFO ]: Start accepts. Automaton has 8 states. Word has length 13 [2018-06-18 16:08:39,266 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:08:39,266 INFO ]: With dead ends: 15 [2018-06-18 16:08:39,266 INFO ]: Without dead ends: 15 [2018-06-18 16:08:39,267 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2018-06-18 16:08:39,267 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-18 16:08:39,270 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-18 16:08:39,270 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-18 16:08:39,271 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-18 16:08:39,271 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-18 16:08:39,271 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:08:39,271 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-18 16:08:39,271 INFO ]: Interpolant automaton has 8 states. [2018-06-18 16:08:39,271 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-18 16:08:39,271 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-18 16:08:39,271 INFO ]: Found error trace [2018-06-18 16:08:39,272 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:08:39,272 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:08:39,272 INFO ]: Analyzing trace with hash -1649658231, now seen corresponding path program 2 times [2018-06-18 16:08:39,272 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:08:39,272 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:08:39,273 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:39,273 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:08:39,273 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:39,384 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:39,385 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:08:39,731 WARN ]: Spent 136.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 48 [2018-06-18 16:08:39,878 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 16:08:39,878 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:08:39,878 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 16:08:39,891 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 16:08:40,014 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 16:08:40,014 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:40,021 INFO ]: Computing forward predicates... [2018-06-18 16:08:40,565 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 16:08:40,597 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:08:40,597 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2018-06-18 16:08:40,598 INFO ]: Interpolant automaton has 13 states [2018-06-18 16:08:40,598 INFO ]: Constructing interpolant automaton starting with 13 interpolants. [2018-06-18 16:08:40,598 INFO ]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2018-06-18 16:08:40,598 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 13 states. [2018-06-18 16:08:40,921 WARN ]: Spent 221.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 99 [2018-06-18 16:08:41,335 WARN ]: Spent 350.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 114 [2018-06-18 16:08:41,641 WARN ]: Spent 253.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 83 [2018-06-18 16:08:41,762 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:08:41,762 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-18 16:08:41,765 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-18 16:08:41,765 INFO ]: Start accepts. Automaton has 13 states. Word has length 17 [2018-06-18 16:08:41,765 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:08:41,766 INFO ]: With dead ends: 17 [2018-06-18 16:08:41,766 INFO ]: Without dead ends: 17 [2018-06-18 16:08:41,766 INFO ]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2018-06-18 16:08:41,766 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-18 16:08:41,769 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-18 16:08:41,769 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-18 16:08:41,770 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-18 16:08:41,770 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-18 16:08:41,770 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:08:41,770 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-18 16:08:41,770 INFO ]: Interpolant automaton has 13 states. [2018-06-18 16:08:41,770 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-18 16:08:41,770 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-18 16:08:41,770 INFO ]: Found error trace [2018-06-18 16:08:41,770 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:08:41,771 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:08:41,773 INFO ]: Analyzing trace with hash 2119922091, now seen corresponding path program 3 times [2018-06-18 16:08:41,773 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:08:41,773 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:08:41,774 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:41,774 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:08:41,774 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:41,908 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:41,909 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:08:42,301 WARN ]: Spent 115.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 72 [2018-06-18 16:08:42,507 WARN ]: Spent 178.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 54 [2018-06-18 16:08:42,835 WARN ]: Spent 302.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 37 [2018-06-18 16:08:42,969 WARN ]: Spent 115.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 48 [2018-06-18 16:08:42,983 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 16:08:42,984 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:08:42,984 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 16:08:42,990 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 16:08:43,118 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-18 16:08:43,118 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:43,123 INFO ]: Computing forward predicates... [2018-06-18 16:08:43,315 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 16:08:43,336 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:08:43,336 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2018-06-18 16:08:43,336 INFO ]: Interpolant automaton has 17 states [2018-06-18 16:08:43,336 INFO ]: Constructing interpolant automaton starting with 17 interpolants. [2018-06-18 16:08:43,336 INFO ]: CoverageRelationStatistics Valid=37, Invalid=235, Unknown=0, NotChecked=0, Total=272 [2018-06-18 16:08:43,336 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 17 states. [2018-06-18 16:08:43,887 WARN ]: Spent 438.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 137 [2018-06-18 16:08:44,397 WARN ]: Spent 459.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 147 [2018-06-18 16:08:44,913 WARN ]: Spent 415.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 140 [2018-06-18 16:08:45,304 WARN ]: Spent 354.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 121 [2018-06-18 16:08:45,351 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:08:45,351 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-18 16:08:45,351 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-18 16:08:45,351 INFO ]: Start accepts. Automaton has 17 states. Word has length 21 [2018-06-18 16:08:45,352 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:08:45,352 INFO ]: With dead ends: 19 [2018-06-18 16:08:45,352 INFO ]: Without dead ends: 19 [2018-06-18 16:08:45,352 INFO ]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2018-06-18 16:08:45,352 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-18 16:08:45,355 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-18 16:08:45,355 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-18 16:08:45,355 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-18 16:08:45,355 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-18 16:08:45,355 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:08:45,355 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-18 16:08:45,355 INFO ]: Interpolant automaton has 17 states. [2018-06-18 16:08:45,356 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-18 16:08:45,356 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-18 16:08:45,356 INFO ]: Found error trace [2018-06-18 16:08:45,356 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:08:45,356 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:08:45,356 INFO ]: Analyzing trace with hash 1762711629, now seen corresponding path program 4 times [2018-06-18 16:08:45,357 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:08:45,357 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:08:45,357 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:45,358 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:08:45,358 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:45,492 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:45,494 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:08:46,445 WARN ]: Spent 492.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 21 [2018-06-18 16:08:47,062 WARN ]: Spent 530.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 64 [2018-06-18 16:08:47,710 WARN ]: Spent 571.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 61 [2018-06-18 16:08:48,177 WARN ]: Spent 446.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 62 [2018-06-18 16:08:48,345 WARN ]: Spent 130.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 37 [2018-06-18 16:08:48,686 WARN ]: Spent 289.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 42 [2018-06-18 16:08:49,154 WARN ]: Spent 358.00 ms on a formula simplification. DAG size of input: 167 DAG size of output: 56 [2018-06-18 16:08:49,172 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 16:08:49,172 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:08:49,172 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 16:08:49,178 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-18 16:08:49,341 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-18 16:08:49,341 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:49,350 INFO ]: Computing forward predicates... [2018-06-18 16:08:50,403 WARN ]: Spent 134.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 34 [2018-06-18 16:08:50,448 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 16:08:50,469 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:08:50,469 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2018-06-18 16:08:50,470 INFO ]: Interpolant automaton has 21 states [2018-06-18 16:08:50,470 INFO ]: Constructing interpolant automaton starting with 21 interpolants. [2018-06-18 16:08:50,470 INFO ]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2018-06-18 16:08:50,470 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 21 states. [2018-06-18 16:08:51,061 WARN ]: Spent 510.00 ms on a formula simplification. DAG size of input: 174 DAG size of output: 145 [2018-06-18 16:08:51,829 WARN ]: Spent 687.00 ms on a formula simplification. DAG size of input: 232 DAG size of output: 159 [2018-06-18 16:08:52,567 WARN ]: Spent 691.00 ms on a formula simplification. DAG size of input: 211 DAG size of output: 151 [2018-06-18 16:08:53,517 WARN ]: Spent 892.00 ms on a formula simplification. DAG size of input: 208 DAG size of output: 174 [2018-06-18 16:08:54,037 WARN ]: Spent 462.00 ms on a formula simplification. DAG size of input: 154 DAG size of output: 124 [2018-06-18 16:08:54,104 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:08:54,104 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-18 16:08:54,105 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-18 16:08:54,105 INFO ]: Start accepts. Automaton has 21 states. Word has length 25 [2018-06-18 16:08:54,105 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:08:54,106 INFO ]: With dead ends: 21 [2018-06-18 16:08:54,106 INFO ]: Without dead ends: 21 [2018-06-18 16:08:54,106 INFO ]: 0 DeclaredPredicates, 42 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2018-06-18 16:08:54,107 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-18 16:08:54,110 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-18 16:08:54,110 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-18 16:08:54,111 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-18 16:08:54,111 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-18 16:08:54,111 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:08:54,111 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-18 16:08:54,111 INFO ]: Interpolant automaton has 21 states. [2018-06-18 16:08:54,111 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-18 16:08:54,112 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-18 16:08:54,112 INFO ]: Found error trace [2018-06-18 16:08:54,112 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:08:54,112 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:08:54,112 INFO ]: Analyzing trace with hash 853117551, now seen corresponding path program 5 times [2018-06-18 16:08:54,112 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:08:54,112 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:08:54,113 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:54,113 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:08:54,113 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:08:54,379 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:08:54,380 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:08:55,784 WARN ]: Spent 447.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 17 [2018-06-18 16:08:56,349 WARN ]: Spent 525.00 ms on a formula simplification. DAG size of input: 243 DAG size of output: 64 [2018-06-18 16:08:57,463 WARN ]: Spent 995.00 ms on a formula simplification. DAG size of input: 320 DAG size of output: 82 [2018-06-18 16:08:58,754 WARN ]: Spent 1.11 s on a formula simplification. DAG size of input: 382 DAG size of output: 73 [2018-06-18 16:09:00,320 WARN ]: Spent 1.49 s on a formula simplification. DAG size of input: 222 DAG size of output: 63 [2018-06-18 16:09:01,331 WARN ]: Spent 920.00 ms on a formula simplification. DAG size of input: 162 DAG size of output: 35 [2018-06-18 16:09:03,024 WARN ]: Spent 1.50 s on a formula simplification. DAG size of input: 438 DAG size of output: 62 [2018-06-18 16:09:04,170 WARN ]: Spent 999.00 ms on a formula simplification. DAG size of input: 419 DAG size of output: 51 [2018-06-18 16:09:05,082 WARN ]: Spent 818.00 ms on a formula simplification. DAG size of input: 285 DAG size of output: 31 [2018-06-18 16:09:05,104 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 16:09:05,104 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:09:05,104 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 16:09:05,110 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-18 16:09:05,341 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-18 16:09:05,341 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:05,358 INFO ]: Computing forward predicates... [2018-06-18 16:09:06,117 INFO ]: Checked inductivity of 55 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-06-18 16:09:06,138 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:09:06,138 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2018-06-18 16:09:06,139 INFO ]: Interpolant automaton has 24 states [2018-06-18 16:09:06,139 INFO ]: Constructing interpolant automaton starting with 24 interpolants. [2018-06-18 16:09:06,139 INFO ]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2018-06-18 16:09:06,139 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 24 states. [2018-06-18 16:09:07,219 WARN ]: Spent 898.00 ms on a formula simplification. DAG size of input: 214 DAG size of output: 198 [2018-06-18 16:09:08,672 WARN ]: Spent 1.38 s on a formula simplification. DAG size of input: 298 DAG size of output: 215 [2018-06-18 16:09:10,715 WARN ]: Spent 1.86 s on a formula simplification. DAG size of input: 309 DAG size of output: 246 [2018-06-18 16:09:12,245 WARN ]: Spent 1.40 s on a formula simplification. DAG size of input: 280 DAG size of output: 233 [2018-06-18 16:09:13,318 WARN ]: Spent 987.00 ms on a formula simplification. DAG size of input: 229 DAG size of output: 211 [2018-06-18 16:09:14,222 WARN ]: Spent 823.00 ms on a formula simplification. DAG size of input: 198 DAG size of output: 182 [2018-06-18 16:09:14,371 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:09:14,371 INFO ]: Finished difference Result 23 states and 24 transitions. [2018-06-18 16:09:14,372 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-06-18 16:09:14,372 INFO ]: Start accepts. Automaton has 24 states. Word has length 29 [2018-06-18 16:09:14,374 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:09:14,375 INFO ]: With dead ends: 23 [2018-06-18 16:09:14,375 INFO ]: Without dead ends: 23 [2018-06-18 16:09:14,376 INFO ]: 0 DeclaredPredicates, 49 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=179, Invalid=751, Unknown=0, NotChecked=0, Total=930 [2018-06-18 16:09:14,376 INFO ]: Start minimizeSevpa. Operand 23 states. [2018-06-18 16:09:14,379 INFO ]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-06-18 16:09:14,379 INFO ]: Start removeUnreachable. Operand 23 states. [2018-06-18 16:09:14,380 INFO ]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-06-18 16:09:14,380 INFO ]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 29 [2018-06-18 16:09:14,380 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:09:14,380 INFO ]: Abstraction has 23 states and 24 transitions. [2018-06-18 16:09:14,380 INFO ]: Interpolant automaton has 24 states. [2018-06-18 16:09:14,380 INFO ]: Start isEmpty. Operand 23 states and 24 transitions. [2018-06-18 16:09:14,381 INFO ]: Finished isEmpty. Found accepting run of length 34 [2018-06-18 16:09:14,381 INFO ]: Found error trace [2018-06-18 16:09:14,381 INFO ]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:09:14,381 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:09:14,381 INFO ]: Analyzing trace with hash -1661294575, now seen corresponding path program 6 times [2018-06-18 16:09:14,381 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:09:14,381 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:09:14,382 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:14,382 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:09:14,382 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:09:15,132 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:09:15,133 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