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_e1_1116_e7_1440.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-55b8104 [2018-06-18 16:06:23,247 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-18 16:06:23,249 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-18 16:06:23,261 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-18 16:06:23,261 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-18 16:06:23,262 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-18 16:06:23,263 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-18 16:06:23,265 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-18 16:06:23,267 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-18 16:06:23,268 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-18 16:06:23,269 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-18 16:06:23,269 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-18 16:06:23,270 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-18 16:06:23,271 INFO L177 SettingsManager]: ChcToBoogie provides no preferences, ignoring... [2018-06-18 16:06:23,271 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-18 16:06:23,272 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-18 16:06:23,274 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-18 16:06:23,276 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-18 16:06:23,278 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-18 16:06:23,279 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-18 16:06:23,281 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-18 16:06:23,283 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-18 16:06:23,284 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-18 16:06:23,284 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-18 16:06:23,285 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-18 16:06:23,286 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-18 16:06:23,287 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-18 16:06:23,287 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-18 16:06:23,289 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-18 16:06:23,289 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-18 16:06:23,290 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-18 16:06:23,290 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-18 16:06:23,291 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-18 16:06:23,292 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-18 16:06:23,292 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-18 16:06:23,293 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf [2018-06-18 16:06:23,306 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-18 16:06:23,306 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-18 16:06:23,307 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-18 16:06:23,307 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-18 16:06:23,309 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-18 16:06:23,309 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-18 16:06:23,309 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-18 16:06:23,309 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-18 16:06:23,310 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 16:06:23,310 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-18 16:06:23,310 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-18 16:06:23,311 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-18 16:06:23,311 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-18 16:06:23,311 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-18 16:06:23,311 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-18 16:06:23,312 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-18 16:06:23,312 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-18 16:06:23,313 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-18 16:06:23,314 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-18 16:06:23,365 INFO ]: Repository-Root is: /tmp [2018-06-18 16:06:23,382 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-18 16:06:23,389 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-18 16:06:23,390 INFO ]: Initializing SmtParser... [2018-06-18 16:06:23,391 INFO ]: SmtParser initialized [2018-06-18 16:06:23,391 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e1_1116_e7_1440.smt2 [2018-06-18 16:06:23,393 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 16:06:23,486 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e1_1116_e7_1440.smt2 unknown [2018-06-18 16:06:23,881 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e1_1116_e7_1440.smt2 [2018-06-18 16:06:23,886 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-18 16:06:23,904 INFO ]: Walking toolchain with 4 elements. [2018-06-18 16:06:23,904 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-18 16:06:23,904 INFO ]: Initializing ChcToBoogie... [2018-06-18 16:06:23,904 INFO ]: ChcToBoogie initialized [2018-06-18 16:06:23,920 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 04:06:23" (1/1) ... [2018-06-18 16:06:24,051 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24 Unit [2018-06-18 16:06:24,051 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-18 16:06:24,063 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-18 16:06:24,063 INFO ]: Initializing Boogie Preprocessor... [2018-06-18 16:06:24,063 INFO ]: Boogie Preprocessor initialized [2018-06-18 16:06:24,105 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (1/1) ... [2018-06-18 16:06:24,105 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (1/1) ... [2018-06-18 16:06:24,125 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (1/1) ... [2018-06-18 16:06:24,125 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (1/1) ... [2018-06-18 16:06:24,134 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (1/1) ... [2018-06-18 16:06:24,140 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (1/1) ... [2018-06-18 16:06:24,142 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (1/1) ... [2018-06-18 16:06:24,156 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-18 16:06:24,157 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-18 16:06:24,157 INFO ]: Initializing RCFGBuilder... [2018-06-18 16:06:24,157 INFO ]: RCFGBuilder initialized [2018-06-18 16:06:24,158 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (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 16:06:24,173 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-18 16:06:24,173 INFO ]: Found specification of procedure False [2018-06-18 16:06:24,173 INFO ]: Found implementation of procedure False [2018-06-18 16:06:24,173 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-18 16:06:24,173 INFO ]: Found specification of procedure state [2018-06-18 16:06:24,173 INFO ]: Found implementation of procedure state [2018-06-18 16:06:24,173 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-18 16:06:24,173 INFO ]: Found specification of procedure Ultimate.START [2018-06-18 16:06:24,173 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 16:06:24,460 INFO ]: Using library mode [2018-06-18 16:06:24,460 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 04:06:24 BoogieIcfgContainer [2018-06-18 16:06:24,460 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-18 16:06:24,462 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-18 16:06:24,462 INFO ]: Initializing TraceAbstraction... [2018-06-18 16:06:24,465 INFO ]: TraceAbstraction initialized [2018-06-18 16:06:24,466 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 04:06:23" (1/3) ... [2018-06-18 16:06:24,466 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4801cbde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 18.06 04:06:24, skipping insertion in model container [2018-06-18 16:06:24,466 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 04:06:24" (2/3) ... [2018-06-18 16:06:24,467 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4801cbde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.06 04:06:24, skipping insertion in model container [2018-06-18 16:06:24,467 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 04:06:24" (3/3) ... [2018-06-18 16:06:24,469 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-18 16:06:24,478 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-18 16:06:24,490 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-18 16:06:24,540 INFO ]: Using default assertion order modulation [2018-06-18 16:06:24,541 INFO ]: Interprodecural is true [2018-06-18 16:06:24,541 INFO ]: Hoare is false [2018-06-18 16:06:24,541 INFO ]: Compute interpolants for FPandBP [2018-06-18 16:06:24,541 INFO ]: Backedges is TWOTRACK [2018-06-18 16:06:24,541 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-18 16:06:24,541 INFO ]: Difference is false [2018-06-18 16:06:24,541 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-18 16:06:24,541 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-18 16:06:24,564 INFO ]: Start isEmpty. Operand 13 states. [2018-06-18 16:06:24,575 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-18 16:06:24,575 INFO ]: Found error trace [2018-06-18 16:06:24,576 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:06:24,576 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:06:24,584 INFO ]: Analyzing trace with hash -597537630, now seen corresponding path program 1 times [2018-06-18 16:06:24,586 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:06:24,587 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:06:24,637 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:24,637 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:06:24,638 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:24,749 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:24,757 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:06:24,893 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-18 16:06:24,895 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-18 16:06:24,895 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-18 16:06:24,897 INFO ]: Interpolant automaton has 4 states [2018-06-18 16:06:24,912 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-18 16:06:24,912 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 16:06:24,914 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-18 16:06:25,018 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:06:25,018 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-18 16:06:25,018 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-18 16:06:25,019 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-18 16:06:25,020 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:06:25,033 INFO ]: With dead ends: 13 [2018-06-18 16:06:25,033 INFO ]: Without dead ends: 13 [2018-06-18 16:06:25,035 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 16:06:25,055 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-18 16:06:25,081 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-18 16:06:25,083 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-18 16:06:25,083 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-18 16:06:25,084 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-18 16:06:25,085 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:06:25,085 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-18 16:06:25,085 INFO ]: Interpolant automaton has 4 states. [2018-06-18 16:06:25,085 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-18 16:06:25,086 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-18 16:06:25,086 INFO ]: Found error trace [2018-06-18 16:06:25,086 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:06:25,086 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:06:25,088 INFO ]: Analyzing trace with hash 1530833734, now seen corresponding path program 1 times [2018-06-18 16:06:25,088 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:06:25,088 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:06:25,089 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:25,089 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:06:25,089 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:25,215 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:25,216 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:06:25,763 WARN ]: Spent 356.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2018-06-18 16:06:26,096 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 16:06:26,097 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:06:26,097 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) [2018-06-18 16:06:26,113 INFO ]: Keeping assertion order NOT_INCREMENTALLY Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 16:06:26,233 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:26,243 INFO ]: Computing forward predicates... [2018-06-18 16:06:26,618 WARN ]: Spent 121.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 10 [2018-06-18 16:06:26,717 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 16:06:26,751 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:06:26,751 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2018-06-18 16:06:26,751 INFO ]: Interpolant automaton has 8 states [2018-06-18 16:06:26,752 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-18 16:06:26,752 INFO ]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-06-18 16:06:26,752 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 8 states. [2018-06-18 16:06:27,044 WARN ]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2018-06-18 16:06:27,490 WARN ]: Spent 159.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 14 [2018-06-18 16:06:27,553 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:06:27,553 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-18 16:06:27,555 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-18 16:06:27,555 INFO ]: Start accepts. Automaton has 8 states. Word has length 13 [2018-06-18 16:06:27,555 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:06:27,555 INFO ]: With dead ends: 15 [2018-06-18 16:06:27,555 INFO ]: Without dead ends: 15 [2018-06-18 16:06:27,556 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2018-06-18 16:06:27,556 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-18 16:06:27,562 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-18 16:06:27,562 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-18 16:06:27,563 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-18 16:06:27,563 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-18 16:06:27,563 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:06:27,563 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-18 16:06:27,563 INFO ]: Interpolant automaton has 8 states. [2018-06-18 16:06:27,563 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-18 16:06:27,564 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-18 16:06:27,564 INFO ]: Found error trace [2018-06-18 16:06:27,564 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:06:27,564 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:06:27,564 INFO ]: Analyzing trace with hash -1486246934, now seen corresponding path program 2 times [2018-06-18 16:06:27,564 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:06:27,564 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:06:27,565 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:27,565 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 16:06:27,565 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:27,684 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:27,685 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:06:28,120 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 16:06:28,120 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:06:28,120 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 16:06:28,130 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 16:06:28,280 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 16:06:28,280 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:28,286 INFO ]: Computing forward predicates... [2018-06-18 16:06:28,530 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 16:06:28,563 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:06:28,563 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2018-06-18 16:06:28,564 INFO ]: Interpolant automaton has 13 states [2018-06-18 16:06:28,564 INFO ]: Constructing interpolant automaton starting with 13 interpolants. [2018-06-18 16:06:28,564 INFO ]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2018-06-18 16:06:28,564 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 13 states. [2018-06-18 16:06:28,728 WARN ]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2018-06-18 16:06:28,954 WARN ]: Spent 159.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 81 [2018-06-18 16:06:29,123 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:06:29,123 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-18 16:06:29,125 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-18 16:06:29,125 INFO ]: Start accepts. Automaton has 13 states. Word has length 17 [2018-06-18 16:06:29,125 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:06:29,125 INFO ]: With dead ends: 17 [2018-06-18 16:06:29,125 INFO ]: Without dead ends: 17 [2018-06-18 16:06:29,126 INFO ]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2018-06-18 16:06:29,126 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-18 16:06:29,130 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-18 16:06:29,130 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-18 16:06:29,130 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-18 16:06:29,131 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-18 16:06:29,131 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:06:29,131 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-18 16:06:29,131 INFO ]: Interpolant automaton has 13 states. [2018-06-18 16:06:29,131 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-18 16:06:29,131 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-18 16:06:29,132 INFO ]: Found error trace [2018-06-18 16:06:29,132 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:06:29,132 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:06:29,132 INFO ]: Analyzing trace with hash -2056434034, now seen corresponding path program 3 times [2018-06-18 16:06:29,132 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:06:29,132 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:06:29,133 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:29,133 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:06:29,133 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:29,240 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:29,241 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:06:29,781 WARN ]: Spent 255.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2018-06-18 16:06:30,492 WARN ]: Spent 620.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2018-06-18 16:06:30,747 WARN ]: Spent 224.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 56 [2018-06-18 16:06:31,053 WARN ]: Spent 230.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 36 [2018-06-18 16:06:31,200 WARN ]: Spent 127.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 26 [2018-06-18 16:06:31,218 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 16:06:31,218 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:06:31,218 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 16:06:31,224 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 16:06:31,398 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-18 16:06:31,399 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:31,404 INFO ]: Computing forward predicates... [2018-06-18 16:06:31,659 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 16:06:31,679 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:06:31,680 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2018-06-18 16:06:31,680 INFO ]: Interpolant automaton has 17 states [2018-06-18 16:06:31,680 INFO ]: Constructing interpolant automaton starting with 17 interpolants. [2018-06-18 16:06:31,680 INFO ]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2018-06-18 16:06:31,680 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 17 states. [2018-06-18 16:06:31,926 WARN ]: Spent 185.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 106 [2018-06-18 16:06:32,301 WARN ]: Spent 283.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 119 [2018-06-18 16:06:32,623 WARN ]: Spent 272.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 112 [2018-06-18 16:06:32,836 WARN ]: Spent 164.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 91 [2018-06-18 16:06:32,882 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:06:32,882 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-18 16:06:32,883 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-18 16:06:32,883 INFO ]: Start accepts. Automaton has 17 states. Word has length 21 [2018-06-18 16:06:32,883 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:06:32,884 INFO ]: With dead ends: 19 [2018-06-18 16:06:32,884 INFO ]: Without dead ends: 19 [2018-06-18 16:06:32,884 INFO ]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2018-06-18 16:06:32,884 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-18 16:06:32,887 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-18 16:06:32,887 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-18 16:06:32,888 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-18 16:06:32,888 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-18 16:06:32,888 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:06:32,888 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-18 16:06:32,888 INFO ]: Interpolant automaton has 17 states. [2018-06-18 16:06:32,888 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-18 16:06:32,888 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-18 16:06:32,889 INFO ]: Found error trace [2018-06-18 16:06:32,889 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:06:32,889 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:06:32,889 INFO ]: Analyzing trace with hash -434924750, now seen corresponding path program 4 times [2018-06-18 16:06:32,889 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:06:32,889 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:06:32,890 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:32,890 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:06:32,890 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:33,033 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:33,043 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:06:33,981 WARN ]: Spent 472.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 22 [2018-06-18 16:06:34,629 WARN ]: Spent 609.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 51 [2018-06-18 16:06:35,142 WARN ]: Spent 424.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 69 [2018-06-18 16:06:35,379 WARN ]: Spent 214.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 38 [2018-06-18 16:06:35,630 WARN ]: Spent 214.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 25 [2018-06-18 16:06:36,070 WARN ]: Spent 248.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 38 [2018-06-18 16:06:36,286 WARN ]: Spent 183.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 36 [2018-06-18 16:06:36,304 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 16:06:36,304 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:06:36,304 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 16:06:36,318 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-18 16:06:36,507 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-18 16:06:36,508 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:36,519 INFO ]: Computing forward predicates... [2018-06-18 16:06:37,084 INFO ]: Checked inductivity of 36 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-06-18 16:06:37,106 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:06:37,106 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2018-06-18 16:06:37,106 INFO ]: Interpolant automaton has 20 states [2018-06-18 16:06:37,106 INFO ]: Constructing interpolant automaton starting with 20 interpolants. [2018-06-18 16:06:37,106 INFO ]: CoverageRelationStatistics Valid=44, Invalid=336, Unknown=0, NotChecked=0, Total=380 [2018-06-18 16:06:37,106 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 20 states. [2018-06-18 16:06:37,744 WARN ]: Spent 579.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 102 [2018-06-18 16:06:38,697 WARN ]: Spent 768.00 ms on a formula simplification. DAG size of input: 214 DAG size of output: 99 [2018-06-18 16:06:39,247 WARN ]: Spent 450.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 127 [2018-06-18 16:06:40,042 WARN ]: Spent 660.00 ms on a formula simplification. DAG size of input: 209 DAG size of output: 118 [2018-06-18 16:06:40,441 WARN ]: Spent 340.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 84 [2018-06-18 16:06:40,501 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:06:40,501 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-18 16:06:40,506 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-18 16:06:40,506 INFO ]: Start accepts. Automaton has 20 states. Word has length 25 [2018-06-18 16:06:40,506 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:06:40,507 INFO ]: With dead ends: 21 [2018-06-18 16:06:40,507 INFO ]: Without dead ends: 21 [2018-06-18 16:06:40,507 INFO ]: 0 DeclaredPredicates, 42 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-06-18 16:06:40,508 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-18 16:06:40,512 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-18 16:06:40,512 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-18 16:06:40,513 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-18 16:06:40,513 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-18 16:06:40,513 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:06:40,513 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-18 16:06:40,513 INFO ]: Interpolant automaton has 20 states. [2018-06-18 16:06:40,513 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-18 16:06:40,514 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-18 16:06:40,514 INFO ]: Found error trace [2018-06-18 16:06:40,514 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:06:40,514 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:06:40,514 INFO ]: Analyzing trace with hash 1986427350, now seen corresponding path program 5 times [2018-06-18 16:06:40,514 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:06:40,514 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:06:40,515 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:40,515 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:06:40,515 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:06:40,797 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:06:40,799 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 16:06:44,481 WARN ]: Spent 1.84 s on a formula simplification. DAG size of input: 254 DAG size of output: 21 [2018-06-18 16:06:46,019 WARN ]: Spent 1.45 s on a formula simplification. DAG size of input: 304 DAG size of output: 44 [2018-06-18 16:06:47,356 WARN ]: Spent 1.21 s on a formula simplification. DAG size of input: 290 DAG size of output: 41 [2018-06-18 16:06:49,466 WARN ]: Spent 1.90 s on a formula simplification. DAG size of input: 401 DAG size of output: 43 [2018-06-18 16:06:50,742 WARN ]: Spent 1.11 s on a formula simplification. DAG size of input: 364 DAG size of output: 51 [2018-06-18 16:06:52,388 WARN ]: Spent 1.53 s on a formula simplification. DAG size of input: 348 DAG size of output: 52 [2018-06-18 16:06:56,311 WARN ]: Spent 3.65 s on a formula simplification. DAG size of input: 605 DAG size of output: 50 [2018-06-18 16:06:59,090 WARN ]: Spent 2.59 s on a formula simplification. DAG size of input: 550 DAG size of output: 52 [2018-06-18 16:07:04,859 WARN ]: Spent 5.37 s on a formula simplification. DAG size of input: 523 DAG size of output: 43 [2018-06-18 16:07:04,880 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 16:07:04,881 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 16:07:04,881 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 16:07:04,887 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-18 16:07:05,215 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-18 16:07:05,215 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:07:05,225 INFO ]: Computing forward predicates... [2018-06-18 16:07:05,840 INFO ]: Checked inductivity of 55 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-06-18 16:07:05,861 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 16:07:05,861 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2018-06-18 16:07:05,861 INFO ]: Interpolant automaton has 23 states [2018-06-18 16:07:05,861 INFO ]: Constructing interpolant automaton starting with 23 interpolants. [2018-06-18 16:07:05,861 INFO ]: CoverageRelationStatistics Valid=54, Invalid=452, Unknown=0, NotChecked=0, Total=506 [2018-06-18 16:07:05,862 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 23 states. [2018-06-18 16:07:06,153 WARN ]: Spent 212.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 93 [2018-06-18 16:07:06,331 WARN ]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-06-18 16:07:07,259 WARN ]: Spent 820.00 ms on a formula simplification. DAG size of input: 271 DAG size of output: 125 [2018-06-18 16:07:08,973 WARN ]: Spent 1.66 s on a formula simplification. DAG size of input: 277 DAG size of output: 125 [2018-06-18 16:07:09,734 WARN ]: Spent 687.00 ms on a formula simplification. DAG size of input: 253 DAG size of output: 145 [2018-06-18 16:07:10,314 WARN ]: Spent 391.00 ms on a formula simplification. DAG size of input: 190 DAG size of output: 142 [2018-06-18 16:07:10,581 WARN ]: Spent 197.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 79 [2018-06-18 16:07:10,637 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 16:07:10,637 INFO ]: Finished difference Result 23 states and 24 transitions. [2018-06-18 16:07:10,637 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-06-18 16:07:10,637 INFO ]: Start accepts. Automaton has 23 states. Word has length 29 [2018-06-18 16:07:10,637 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 16:07:10,638 INFO ]: With dead ends: 23 [2018-06-18 16:07:10,638 INFO ]: Without dead ends: 23 [2018-06-18 16:07:10,638 INFO ]: 0 DeclaredPredicates, 49 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 26.8s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2018-06-18 16:07:10,638 INFO ]: Start minimizeSevpa. Operand 23 states. [2018-06-18 16:07:10,640 INFO ]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-06-18 16:07:10,640 INFO ]: Start removeUnreachable. Operand 23 states. [2018-06-18 16:07:10,642 INFO ]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-06-18 16:07:10,643 INFO ]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 29 [2018-06-18 16:07:10,643 INFO ]: Finished accepts. word is rejected. [2018-06-18 16:07:10,643 INFO ]: Abstraction has 23 states and 24 transitions. [2018-06-18 16:07:10,643 INFO ]: Interpolant automaton has 23 states. [2018-06-18 16:07:10,643 INFO ]: Start isEmpty. Operand 23 states and 24 transitions. [2018-06-18 16:07:10,644 INFO ]: Finished isEmpty. Found accepting run of length 34 [2018-06-18 16:07:10,644 INFO ]: Found error trace [2018-06-18 16:07:10,644 INFO ]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 16:07:10,644 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 16:07:10,644 INFO ]: Analyzing trace with hash 800064122, now seen corresponding path program 6 times [2018-06-18 16:07:10,644 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 16:07:10,644 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 16:07:10,645 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:07:10,645 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 16:07:10,645 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 16:07:11,415 INFO ]: Conjunction of SSA is unsat [2018-06-18 16:07:11,416 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