java -Xmx4000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCHC.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/down.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-55b8104 [2018-06-18 13:18:59,994 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-18 13:18:59,996 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-18 13:19:00,008 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-18 13:19:00,008 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-18 13:19:00,009 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-18 13:19:00,011 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-18 13:19:00,015 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-18 13:19:00,018 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-18 13:19:00,019 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-18 13:19:00,020 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-18 13:19:00,020 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-18 13:19:00,021 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-18 13:19:00,024 INFO L177 SettingsManager]: ChcToBoogie provides no preferences, ignoring... [2018-06-18 13:19:00,024 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-18 13:19:00,025 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-18 13:19:00,027 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-18 13:19:00,041 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-18 13:19:00,042 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-18 13:19:00,043 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-18 13:19:00,044 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-18 13:19:00,046 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-18 13:19:00,047 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-18 13:19:00,047 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-18 13:19:00,048 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-18 13:19:00,048 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-18 13:19:00,054 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-18 13:19:00,055 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-18 13:19:00,056 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-18 13:19:00,060 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-18 13:19:00,061 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-18 13:19:00,062 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-18 13:19:00,062 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-18 13:19:00,063 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-18 13:19:00,064 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-18 13:19:00,064 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chccomp2018/chcToBoogie_automizer.epf [2018-06-18 13:19:00,086 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-18 13:19:00,086 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-18 13:19:00,087 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-18 13:19:00,087 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-18 13:19:00,088 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-18 13:19:00,089 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-18 13:19:00,091 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-18 13:19:00,091 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-18 13:19:00,092 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-18 13:19:00,092 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-18 13:19:00,092 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-18 13:19:00,092 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-18 13:19:00,092 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-18 13:19:00,093 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-18 13:19:00,093 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-18 13:19:00,093 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-18 13:19:00,093 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-18 13:19:00,096 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-18 13:19:00,096 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-18 13:19:00,148 INFO ]: Repository-Root is: /tmp [2018-06-18 13:19:00,163 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-18 13:19:00,168 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-18 13:19:00,169 INFO ]: Initializing SmtParser... [2018-06-18 13:19:00,169 INFO ]: SmtParser initialized [2018-06-18 13:19:00,170 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/down.c.smt2 [2018-06-18 13:19:00,171 INFO ]: Parsing .smt2 file as a set of Horn Clauses No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2018-06-18 13:19:00,258 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/down.c.smt2 unknown [2018-06-18 13:19:00,458 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/down.c.smt2 [2018-06-18 13:19:00,462 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-18 13:19:00,469 INFO ]: Walking toolchain with 4 elements. [2018-06-18 13:19:00,469 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-18 13:19:00,469 INFO ]: Initializing ChcToBoogie... [2018-06-18 13:19:00,470 INFO ]: ChcToBoogie initialized [2018-06-18 13:19:00,478 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 01:19:00" (1/1) ... [2018-06-18 13:19:00,540 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00 Unit [2018-06-18 13:19:00,540 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-18 13:19:00,544 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-18 13:19:00,544 INFO ]: Initializing Boogie Preprocessor... [2018-06-18 13:19:00,544 INFO ]: Boogie Preprocessor initialized [2018-06-18 13:19:00,567 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (1/1) ... [2018-06-18 13:19:00,567 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (1/1) ... [2018-06-18 13:19:00,576 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (1/1) ... [2018-06-18 13:19:00,577 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (1/1) ... [2018-06-18 13:19:00,595 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (1/1) ... [2018-06-18 13:19:00,596 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (1/1) ... [2018-06-18 13:19:00,597 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (1/1) ... [2018-06-18 13:19:00,599 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-18 13:19:00,600 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-18 13:19:00,600 INFO ]: Initializing RCFGBuilder... [2018-06-18 13:19:00,600 INFO ]: RCFGBuilder initialized [2018-06-18 13:19:00,601 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (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 13:19:00,636 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-18 13:19:00,636 INFO ]: Found specification of procedure False [2018-06-18 13:19:00,636 INFO ]: Found implementation of procedure False [2018-06-18 13:19:00,636 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-18 13:19:00,637 INFO ]: Found specification of procedure state [2018-06-18 13:19:00,637 INFO ]: Found implementation of procedure state [2018-06-18 13:19:00,637 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-18 13:19:00,637 INFO ]: Found specification of procedure Ultimate.START [2018-06-18 13:19:00,637 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 13:19:00,937 INFO ]: Using library mode [2018-06-18 13:19:00,937 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 01:19:00 BoogieIcfgContainer [2018-06-18 13:19:00,937 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-18 13:19:00,938 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-18 13:19:00,938 INFO ]: Initializing TraceAbstraction... [2018-06-18 13:19:00,944 INFO ]: TraceAbstraction initialized [2018-06-18 13:19:00,944 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 18.06 01:19:00" (1/3) ... [2018-06-18 13:19:00,945 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3061fb80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 18.06 01:19:00, skipping insertion in model container [2018-06-18 13:19:00,945 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 18.06 01:19:00" (2/3) ... [2018-06-18 13:19:00,946 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3061fb80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.06 01:19:00, skipping insertion in model container [2018-06-18 13:19:00,946 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.06 01:19:00" (3/3) ... [2018-06-18 13:19:00,948 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-18 13:19:00,958 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-18 13:19:00,967 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-18 13:19:01,014 INFO ]: Using default assertion order modulation [2018-06-18 13:19:01,015 INFO ]: Interprodecural is true [2018-06-18 13:19:01,015 INFO ]: Hoare is false [2018-06-18 13:19:01,015 INFO ]: Compute interpolants for FPandBP [2018-06-18 13:19:01,015 INFO ]: Backedges is TWOTRACK [2018-06-18 13:19:01,015 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-18 13:19:01,015 INFO ]: Difference is false [2018-06-18 13:19:01,015 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-18 13:19:01,015 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-18 13:19:01,040 INFO ]: Start isEmpty. Operand 13 states. [2018-06-18 13:19:01,055 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-18 13:19:01,055 INFO ]: Found error trace [2018-06-18 13:19:01,059 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:01,059 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:01,065 INFO ]: Analyzing trace with hash -683425083, now seen corresponding path program 1 times [2018-06-18 13:19:01,067 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:01,068 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:01,121 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:01,121 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:19:01,121 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:01,159 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:01,169 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:01,268 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-18 13:19:01,270 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-18 13:19:01,270 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-18 13:19:01,271 INFO ]: Interpolant automaton has 4 states [2018-06-18 13:19:01,285 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-18 13:19:01,285 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 13:19:01,287 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-18 13:19:01,400 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:01,400 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-18 13:19:01,401 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-18 13:19:01,402 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-18 13:19:01,402 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:01,414 INFO ]: With dead ends: 13 [2018-06-18 13:19:01,414 INFO ]: Without dead ends: 13 [2018-06-18 13:19:01,416 INFO ]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-18 13:19:01,432 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-18 13:19:01,452 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-18 13:19:01,453 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-18 13:19:01,454 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-18 13:19:01,455 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-18 13:19:01,455 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:01,455 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-18 13:19:01,455 INFO ]: Interpolant automaton has 4 states. [2018-06-18 13:19:01,455 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-18 13:19:01,456 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-18 13:19:01,456 INFO ]: Found error trace [2018-06-18 13:19:01,456 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:01,456 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:01,457 INFO ]: Analyzing trace with hash 204343015, now seen corresponding path program 1 times [2018-06-18 13:19:01,457 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:01,457 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:01,457 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:01,457 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:19:01,457 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:01,494 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:01,495 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:01,682 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 13:19:01,682 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:01,682 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:01,690 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:19:01,725 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:01,734 INFO ]: Computing forward predicates... [2018-06-18 13:19:01,953 WARN ]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-06-18 13:19:02,129 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-18 13:19:02,165 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:02,165 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2018-06-18 13:19:02,165 INFO ]: Interpolant automaton has 9 states [2018-06-18 13:19:02,165 INFO ]: Constructing interpolant automaton starting with 9 interpolants. [2018-06-18 13:19:02,166 INFO ]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-06-18 13:19:02,166 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2018-06-18 13:19:02,475 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:02,475 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-18 13:19:02,475 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-18 13:19:02,475 INFO ]: Start accepts. Automaton has 9 states. Word has length 13 [2018-06-18 13:19:02,475 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:02,476 INFO ]: With dead ends: 15 [2018-06-18 13:19:02,476 INFO ]: Without dead ends: 15 [2018-06-18 13:19:02,477 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2018-06-18 13:19:02,477 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-18 13:19:02,480 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-18 13:19:02,480 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-18 13:19:02,480 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-18 13:19:02,481 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-18 13:19:02,481 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:02,481 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-18 13:19:02,481 INFO ]: Interpolant automaton has 9 states. [2018-06-18 13:19:02,481 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-18 13:19:02,481 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-18 13:19:02,481 INFO ]: Found error trace [2018-06-18 13:19:02,481 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:02,482 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:02,482 INFO ]: Analyzing trace with hash -1649658231, now seen corresponding path program 2 times [2018-06-18 13:19:02,482 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:02,482 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:02,483 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:02,483 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:19:02,483 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:02,517 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:02,518 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:02,737 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 13:19:02,737 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:02,737 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:02,746 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 13:19:02,788 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 13:19:02,788 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:02,791 INFO ]: Computing forward predicates... [2018-06-18 13:19:03,054 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-18 13:19:03,074 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:03,074 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2018-06-18 13:19:03,074 INFO ]: Interpolant automaton has 11 states [2018-06-18 13:19:03,074 INFO ]: Constructing interpolant automaton starting with 11 interpolants. [2018-06-18 13:19:03,075 INFO ]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2018-06-18 13:19:03,075 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 11 states. [2018-06-18 13:19:03,606 WARN ]: Spent 420.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2018-06-18 13:19:03,864 WARN ]: Spent 239.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 14 [2018-06-18 13:19:03,964 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:03,964 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-18 13:19:03,964 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-18 13:19:03,964 INFO ]: Start accepts. Automaton has 11 states. Word has length 17 [2018-06-18 13:19:03,964 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:03,965 INFO ]: With dead ends: 17 [2018-06-18 13:19:03,965 INFO ]: Without dead ends: 17 [2018-06-18 13:19:03,965 INFO ]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-06-18 13:19:03,965 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-18 13:19:03,968 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-18 13:19:03,968 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-18 13:19:03,969 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-18 13:19:03,969 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-18 13:19:03,969 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:03,969 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-18 13:19:03,969 INFO ]: Interpolant automaton has 11 states. [2018-06-18 13:19:03,969 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-18 13:19:03,970 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-18 13:19:03,970 INFO ]: Found error trace [2018-06-18 13:19:03,970 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:03,970 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:03,970 INFO ]: Analyzing trace with hash 2119922091, now seen corresponding path program 3 times [2018-06-18 13:19:03,970 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:03,970 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:03,971 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:03,971 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:19:03,971 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:04,003 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:04,004 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:04,320 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 13:19:04,320 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:04,320 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:04,332 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 13:19:04,365 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-18 13:19:04,365 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:04,368 INFO ]: Computing forward predicates... [2018-06-18 13:19:04,678 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-18 13:19:04,711 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:04,711 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 12 [2018-06-18 13:19:04,712 INFO ]: Interpolant automaton has 12 states [2018-06-18 13:19:04,712 INFO ]: Constructing interpolant automaton starting with 12 interpolants. [2018-06-18 13:19:04,712 INFO ]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2018-06-18 13:19:04,712 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 12 states. [2018-06-18 13:19:05,081 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:05,081 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-18 13:19:05,082 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-18 13:19:05,082 INFO ]: Start accepts. Automaton has 12 states. Word has length 21 [2018-06-18 13:19:05,082 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:05,083 INFO ]: With dead ends: 19 [2018-06-18 13:19:05,083 INFO ]: Without dead ends: 19 [2018-06-18 13:19:05,083 INFO ]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2018-06-18 13:19:05,083 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-18 13:19:05,086 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-18 13:19:05,086 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-18 13:19:05,087 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-18 13:19:05,087 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-18 13:19:05,087 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:05,087 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-18 13:19:05,087 INFO ]: Interpolant automaton has 12 states. [2018-06-18 13:19:05,087 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-18 13:19:05,088 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-18 13:19:05,088 INFO ]: Found error trace [2018-06-18 13:19:05,088 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:05,088 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:05,088 INFO ]: Analyzing trace with hash 1762711629, now seen corresponding path program 4 times [2018-06-18 13:19:05,088 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:05,088 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:05,089 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:05,089 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:19:05,089 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:05,124 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:05,125 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:05,443 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 13:19:05,443 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:05,443 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:05,454 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-18 13:19:05,486 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-18 13:19:05,486 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:05,490 INFO ]: Computing forward predicates... [2018-06-18 13:19:06,286 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-18 13:19:06,308 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:06,308 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 16 [2018-06-18 13:19:06,308 INFO ]: Interpolant automaton has 16 states [2018-06-18 13:19:06,308 INFO ]: Constructing interpolant automaton starting with 16 interpolants. [2018-06-18 13:19:06,309 INFO ]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2018-06-18 13:19:06,309 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 16 states. [2018-06-18 13:19:06,615 WARN ]: Spent 158.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 38 [2018-06-18 13:19:06,989 WARN ]: Spent 158.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 28 [2018-06-18 13:19:07,133 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:07,133 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-18 13:19:07,138 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-18 13:19:07,138 INFO ]: Start accepts. Automaton has 16 states. Word has length 25 [2018-06-18 13:19:07,139 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:07,139 INFO ]: With dead ends: 21 [2018-06-18 13:19:07,139 INFO ]: Without dead ends: 21 [2018-06-18 13:19:07,140 INFO ]: 0 DeclaredPredicates, 42 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2018-06-18 13:19:07,140 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-18 13:19:07,143 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-18 13:19:07,143 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-18 13:19:07,144 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-18 13:19:07,144 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-18 13:19:07,144 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:07,144 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-18 13:19:07,144 INFO ]: Interpolant automaton has 16 states. [2018-06-18 13:19:07,144 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-18 13:19:07,145 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-18 13:19:07,145 INFO ]: Found error trace [2018-06-18 13:19:07,145 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:07,145 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:07,145 INFO ]: Analyzing trace with hash 853117551, now seen corresponding path program 5 times [2018-06-18 13:19:07,145 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:07,145 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:07,146 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:07,146 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:19:07,146 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:07,228 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:07,228 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:07,537 WARN ]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-06-18 13:19:07,891 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 13:19:07,891 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:07,892 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:07,898 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-18 13:19:07,956 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-18 13:19:07,956 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:07,960 INFO ]: Computing forward predicates... [2018-06-18 13:19:13,123 WARN ]: Spent 4.49 s on a formula simplification. DAG size of input: 596 DAG size of output: 54 [2018-06-18 13:19:15,145 WARN ]: Spent 1.24 s on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2018-06-18 13:19:17,259 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-18 13:19:17,292 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:17,297 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2018-06-18 13:19:17,298 INFO ]: Interpolant automaton has 20 states [2018-06-18 13:19:17,298 INFO ]: Constructing interpolant automaton starting with 20 interpolants. [2018-06-18 13:19:17,298 INFO ]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2018-06-18 13:19:17,298 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 20 states. [2018-06-18 13:19:18,181 WARN ]: Spent 514.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 84 [2018-06-18 13:19:18,383 WARN ]: Spent 136.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 20 [2018-06-18 13:19:18,665 WARN ]: Spent 250.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 38 [2018-06-18 13:19:19,012 WARN ]: Spent 316.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 44 [2018-06-18 13:19:19,259 WARN ]: Spent 223.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 33 [2018-06-18 13:19:19,420 WARN ]: Spent 131.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 23 [2018-06-18 13:19:19,924 WARN ]: Spent 449.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 74 [2018-06-18 13:19:19,991 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:19,991 INFO ]: Finished difference Result 25 states and 26 transitions. [2018-06-18 13:19:19,992 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-06-18 13:19:19,992 INFO ]: Start accepts. Automaton has 20 states. Word has length 29 [2018-06-18 13:19:19,992 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:19,993 INFO ]: With dead ends: 25 [2018-06-18 13:19:19,993 INFO ]: Without dead ends: 25 [2018-06-18 13:19:19,993 INFO ]: 0 DeclaredPredicates, 49 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=153, Invalid=549, Unknown=0, NotChecked=0, Total=702 [2018-06-18 13:19:19,993 INFO ]: Start minimizeSevpa. Operand 25 states. [2018-06-18 13:19:19,999 INFO ]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-06-18 13:19:19,999 INFO ]: Start removeUnreachable. Operand 25 states. [2018-06-18 13:19:20,000 INFO ]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-06-18 13:19:20,000 INFO ]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 29 [2018-06-18 13:19:20,000 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:20,000 INFO ]: Abstraction has 25 states and 26 transitions. [2018-06-18 13:19:20,000 INFO ]: Interpolant automaton has 20 states. [2018-06-18 13:19:20,000 INFO ]: Start isEmpty. Operand 25 states and 26 transitions. [2018-06-18 13:19:20,001 INFO ]: Finished isEmpty. Found accepting run of length 38 [2018-06-18 13:19:20,001 INFO ]: Found error trace [2018-06-18 13:19:20,001 INFO ]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:20,001 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:20,001 INFO ]: Analyzing trace with hash -1494134477, now seen corresponding path program 6 times [2018-06-18 13:19:20,001 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:20,001 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:20,004 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:20,004 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:19:20,004 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:20,165 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:20,165 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:20,890 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-18 13:19:20,890 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:20,890 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-06-18 13:19:20,908 INFO ]: Keeping assertion order MIX_INSIDE_OUTSIDE Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:20,981 INFO ]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-06-18 13:19:20,981 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:20,986 INFO ]: Computing forward predicates... [2018-06-18 13:19:21,542 WARN ]: Spent 362.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 32 [2018-06-18 13:19:23,099 WARN ]: Spent 1.08 s on a formula simplification. DAG size of input: 48 DAG size of output: 25 [2018-06-18 13:19:24,349 WARN ]: Spent 560.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 28 [2018-06-18 13:19:25,383 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-18 13:19:25,404 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:25,404 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2018-06-18 13:19:25,404 INFO ]: Interpolant automaton has 27 states [2018-06-18 13:19:25,404 INFO ]: Constructing interpolant automaton starting with 27 interpolants. [2018-06-18 13:19:25,405 INFO ]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2018-06-18 13:19:25,405 INFO ]: Start difference. First operand 25 states and 26 transitions. Second operand 27 states. [2018-06-18 13:19:26,092 WARN ]: Spent 638.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 67 [2018-06-18 13:19:26,249 WARN ]: Spent 111.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 18 [2018-06-18 13:19:26,512 WARN ]: Spent 210.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 38 [2018-06-18 13:19:26,693 WARN ]: Spent 149.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 38 [2018-06-18 13:19:26,876 WARN ]: Spent 143.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 31 [2018-06-18 13:19:27,154 WARN ]: Spent 206.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 31 [2018-06-18 13:19:27,492 WARN ]: Spent 271.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 42 [2018-06-18 13:19:27,855 WARN ]: Spent 316.00 ms on a formula simplification. DAG size of input: 107 DAG size of output: 53 [2018-06-18 13:19:27,930 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:27,930 INFO ]: Finished difference Result 27 states and 28 transitions. [2018-06-18 13:19:27,931 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-06-18 13:19:27,931 INFO ]: Start accepts. Automaton has 27 states. Word has length 37 [2018-06-18 13:19:27,931 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:27,932 INFO ]: With dead ends: 27 [2018-06-18 13:19:27,932 INFO ]: Without dead ends: 27 [2018-06-18 13:19:27,932 INFO ]: 0 DeclaredPredicates, 62 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=228, Invalid=962, Unknown=0, NotChecked=0, Total=1190 [2018-06-18 13:19:27,932 INFO ]: Start minimizeSevpa. Operand 27 states. [2018-06-18 13:19:27,936 INFO ]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-06-18 13:19:27,936 INFO ]: Start removeUnreachable. Operand 27 states. [2018-06-18 13:19:27,937 INFO ]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-06-18 13:19:27,937 INFO ]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 37 [2018-06-18 13:19:27,937 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:27,937 INFO ]: Abstraction has 27 states and 28 transitions. [2018-06-18 13:19:27,937 INFO ]: Interpolant automaton has 27 states. [2018-06-18 13:19:27,937 INFO ]: Start isEmpty. Operand 27 states and 28 transitions. [2018-06-18 13:19:27,938 INFO ]: Finished isEmpty. Found accepting run of length 42 [2018-06-18 13:19:27,938 INFO ]: Found error trace [2018-06-18 13:19:27,938 INFO ]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:27,938 INFO ]: === Iteration 8 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:27,939 INFO ]: Analyzing trace with hash 1618126293, now seen corresponding path program 7 times [2018-06-18 13:19:27,939 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:27,939 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:27,939 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:27,939 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:19:27,939 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:28,059 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:28,060 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:28,722 WARN ]: Spent 111.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 33 [2018-06-18 13:19:29,059 INFO ]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-06-18 13:19:29,059 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:29,059 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:29,066 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:19:29,131 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:29,140 INFO ]: Computing forward predicates... [2018-06-18 13:19:32,512 WARN ]: Spent 3.00 s on a formula simplification. DAG size of input: 550 DAG size of output: 47 [2018-06-18 13:19:33,185 WARN ]: Spent 366.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 39 [2018-06-18 13:19:35,559 WARN ]: Spent 1.94 s on a formula simplification. DAG size of input: 251 DAG size of output: 57 [2018-06-18 13:19:36,185 INFO ]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-06-18 13:19:36,205 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:36,205 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2018-06-18 13:19:36,205 INFO ]: Interpolant automaton has 29 states [2018-06-18 13:19:36,206 INFO ]: Constructing interpolant automaton starting with 29 interpolants. [2018-06-18 13:19:36,206 INFO ]: CoverageRelationStatistics Valid=83, Invalid=729, Unknown=0, NotChecked=0, Total=812 [2018-06-18 13:19:36,206 INFO ]: Start difference. First operand 27 states and 28 transitions. Second operand 29 states. [2018-06-18 13:19:37,726 WARN ]: Spent 1.43 s on a formula simplification. DAG size of input: 164 DAG size of output: 93 [2018-06-18 13:19:38,128 WARN ]: Spent 337.00 ms on a formula simplification. DAG size of input: 158 DAG size of output: 21 [2018-06-18 13:19:38,499 WARN ]: Spent 323.00 ms on a formula simplification. DAG size of input: 169 DAG size of output: 42 [2018-06-18 13:19:39,030 WARN ]: Spent 452.00 ms on a formula simplification. DAG size of input: 164 DAG size of output: 53 [2018-06-18 13:19:39,493 WARN ]: Spent 419.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 22 [2018-06-18 13:19:40,018 WARN ]: Spent 479.00 ms on a formula simplification. DAG size of input: 160 DAG size of output: 32 [2018-06-18 13:19:40,688 WARN ]: Spent 624.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 43 [2018-06-18 13:19:41,384 WARN ]: Spent 652.00 ms on a formula simplification. DAG size of input: 163 DAG size of output: 53 [2018-06-18 13:19:42,340 WARN ]: Spent 893.00 ms on a formula simplification. DAG size of input: 168 DAG size of output: 57 [2018-06-18 13:19:42,398 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:42,398 INFO ]: Finished difference Result 29 states and 30 transitions. [2018-06-18 13:19:42,398 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-06-18 13:19:42,398 INFO ]: Start accepts. Automaton has 29 states. Word has length 41 [2018-06-18 13:19:42,399 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:42,399 INFO ]: With dead ends: 29 [2018-06-18 13:19:42,399 INFO ]: Without dead ends: 29 [2018-06-18 13:19:42,400 INFO ]: 0 DeclaredPredicates, 70 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2018-06-18 13:19:42,400 INFO ]: Start minimizeSevpa. Operand 29 states. [2018-06-18 13:19:42,404 INFO ]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-06-18 13:19:42,404 INFO ]: Start removeUnreachable. Operand 29 states. [2018-06-18 13:19:42,404 INFO ]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-06-18 13:19:42,404 INFO ]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 41 [2018-06-18 13:19:42,405 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:42,405 INFO ]: Abstraction has 29 states and 30 transitions. [2018-06-18 13:19:42,405 INFO ]: Interpolant automaton has 29 states. [2018-06-18 13:19:42,405 INFO ]: Start isEmpty. Operand 29 states and 30 transitions. [2018-06-18 13:19:42,406 INFO ]: Finished isEmpty. Found accepting run of length 46 [2018-06-18 13:19:42,406 INFO ]: Found error trace [2018-06-18 13:19:42,407 INFO ]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:42,407 INFO ]: === Iteration 9 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:42,407 INFO ]: Analyzing trace with hash 996918775, now seen corresponding path program 8 times [2018-06-18 13:19:42,407 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:42,407 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:42,407 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:42,407 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-18 13:19:42,407 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:42,476 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:42,477 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:42,711 WARN ]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-06-18 13:19:43,662 WARN ]: Spent 900.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2018-06-18 13:19:44,473 INFO ]: Checked inductivity of 171 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-06-18 13:19:44,473 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:44,473 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:44,480 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-18 13:19:44,560 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-18 13:19:44,560 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:44,568 INFO ]: Computing forward predicates... [2018-06-18 13:19:44,942 WARN ]: Spent 198.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 35 [2018-06-18 13:19:45,105 WARN ]: Spent 111.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 32 [2018-06-18 13:19:45,281 WARN ]: Spent 136.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2018-06-18 13:19:47,833 WARN ]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2018-06-18 13:19:48,720 INFO ]: Checked inductivity of 171 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-06-18 13:19:48,742 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:48,742 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 41 [2018-06-18 13:19:48,742 INFO ]: Interpolant automaton has 41 states [2018-06-18 13:19:48,742 INFO ]: Constructing interpolant automaton starting with 41 interpolants. [2018-06-18 13:19:48,743 INFO ]: CoverageRelationStatistics Valid=147, Invalid=1493, Unknown=0, NotChecked=0, Total=1640 [2018-06-18 13:19:48,743 INFO ]: Start difference. First operand 29 states and 30 transitions. Second operand 41 states. [2018-06-18 13:19:49,714 WARN ]: Spent 911.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 95 [2018-06-18 13:19:50,015 WARN ]: Spent 183.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 32 [2018-06-18 13:19:50,351 WARN ]: Spent 269.00 ms on a formula simplification. DAG size of input: 146 DAG size of output: 43 [2018-06-18 13:19:50,684 WARN ]: Spent 281.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 41 [2018-06-18 13:19:51,014 WARN ]: Spent 276.00 ms on a formula simplification. DAG size of input: 153 DAG size of output: 47 [2018-06-18 13:19:51,360 WARN ]: Spent 295.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 42 [2018-06-18 13:19:51,951 WARN ]: Spent 489.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 53 [2018-06-18 13:19:52,363 WARN ]: Spent 358.00 ms on a formula simplification. DAG size of input: 147 DAG size of output: 47 [2018-06-18 13:19:52,823 WARN ]: Spent 392.00 ms on a formula simplification. DAG size of input: 148 DAG size of output: 56 [2018-06-18 13:19:53,303 WARN ]: Spent 428.00 ms on a formula simplification. DAG size of input: 132 DAG size of output: 62 [2018-06-18 13:19:53,349 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-18 13:19:53,349 INFO ]: Finished difference Result 31 states and 32 transitions. [2018-06-18 13:19:53,385 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-06-18 13:19:53,385 INFO ]: Start accepts. Automaton has 41 states. Word has length 45 [2018-06-18 13:19:53,386 INFO ]: Finished accepts. some prefix is accepted. [2018-06-18 13:19:53,386 INFO ]: With dead ends: 31 [2018-06-18 13:19:53,386 INFO ]: Without dead ends: 31 [2018-06-18 13:19:53,387 INFO ]: 0 DeclaredPredicates, 76 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=391, Invalid=2159, Unknown=0, NotChecked=0, Total=2550 [2018-06-18 13:19:53,387 INFO ]: Start minimizeSevpa. Operand 31 states. [2018-06-18 13:19:53,391 INFO ]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-06-18 13:19:53,391 INFO ]: Start removeUnreachable. Operand 31 states. [2018-06-18 13:19:53,392 INFO ]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-06-18 13:19:53,392 INFO ]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 45 [2018-06-18 13:19:53,392 INFO ]: Finished accepts. word is rejected. [2018-06-18 13:19:53,392 INFO ]: Abstraction has 31 states and 32 transitions. [2018-06-18 13:19:53,392 INFO ]: Interpolant automaton has 41 states. [2018-06-18 13:19:53,392 INFO ]: Start isEmpty. Operand 31 states and 32 transitions. [2018-06-18 13:19:53,393 INFO ]: Finished isEmpty. Found accepting run of length 50 [2018-06-18 13:19:53,393 INFO ]: Found error trace [2018-06-18 13:19:53,393 INFO ]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-18 13:19:53,393 INFO ]: === Iteration 10 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-18 13:19:53,393 INFO ]: Analyzing trace with hash -570306151, now seen corresponding path program 9 times [2018-06-18 13:19:53,393 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-18 13:19:53,393 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-18 13:19:53,394 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:53,394 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-18 13:19:53,394 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-18 13:19:53,491 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:53,494 WARN ]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-06-18 13:19:54,301 WARN ]: Spent 528.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 14 [2018-06-18 13:19:55,109 INFO ]: Checked inductivity of 210 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-06-18 13:19:55,110 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-18 13:19:55,110 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-18 13:19:55,116 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-18 13:19:55,190 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-06-18 13:19:55,190 INFO ]: Conjunction of SSA is unsat [2018-06-18 13:19:55,199 INFO ]: Computing forward predicates... [2018-06-18 13:19:56,161 WARN ]: Spent 749.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 40 [2018-06-18 13:19:56,403 WARN ]: Spent 196.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 35 [2018-06-18 13:19:56,545 WARN ]: Spent 102.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 32 [2018-06-18 13:19:56,855 WARN ]: Spent 258.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 31 [2018-06-18 13:19:57,117 WARN ]: Spent 121.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 39 [2018-06-18 13:19:58,893 INFO ]: Checked inductivity of 210 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-06-18 13:19:58,914 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-18 13:19:58,914 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 43 [2018-06-18 13:19:58,914 INFO ]: Interpolant automaton has 43 states [2018-06-18 13:19:58,914 INFO ]: Constructing interpolant automaton starting with 43 interpolants. [2018-06-18 13:19:58,915 INFO ]: CoverageRelationStatistics Valid=146, Invalid=1660, Unknown=0, NotChecked=0, Total=1806 [2018-06-18 13:19:58,915 INFO ]: Start difference. First operand 31 states and 32 transitions. Second operand 43 states. [2018-06-18 13:19:59,646 WARN ]: Spent 672.00 ms on a formula simplification. DAG size of input: 138 DAG size of output: 84 Received shutdown request... [2018-06-18 13:19:59,835 WARN ]: Removed 15 from assertion stack [2018-06-18 13:19:59,835 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-06-18 13:19:59,835 WARN ]: Verification canceled [2018-06-18 13:19:59,840 WARN ]: Timeout [2018-06-18 13:19:59,840 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.06 01:19:59 BoogieIcfgContainer [2018-06-18 13:19:59,840 INFO ]: ------------------------ END TraceAbstraction---------------------------- [2018-06-18 13:19:59,841 INFO ]: Toolchain (without parser) took 59377.93 ms. Allocated memory was 309.3 MB in the beginning and 744.5 MB in the end (delta: 435.2 MB). Free memory was 263.7 MB in the beginning and 190.6 MB in the end (delta: 73.1 MB). Peak memory consumption was 508.2 MB. Max. memory is 3.6 GB. [2018-06-18 13:19:59,845 INFO ]: SmtParser took 0.07 ms. Allocated memory is still 309.3 MB. Free memory is still 274.8 MB. There was no memory consumed. Max. memory is 3.6 GB. [2018-06-18 13:19:59,845 INFO ]: ChcToBoogie took 71.15 ms. Allocated memory is still 309.3 MB. Free memory was 262.7 MB in the beginning and 260.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. [2018-06-18 13:19:59,845 INFO ]: Boogie Preprocessor took 55.56 ms. Allocated memory is still 309.3 MB. Free memory was 260.7 MB in the beginning and 258.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. [2018-06-18 13:19:59,846 INFO ]: RCFGBuilder took 337.45 ms. Allocated memory is still 309.3 MB. Free memory was 258.7 MB in the beginning and 250.7 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 3.6 GB. [2018-06-18 13:19:59,846 INFO ]: TraceAbstraction took 58901.62 ms. Allocated memory was 309.3 MB in the beginning and 744.5 MB in the end (delta: 435.2 MB). Free memory was 250.7 MB in the beginning and 190.6 MB in the end (delta: 60.1 MB). Peak memory consumption was 495.2 MB. Max. memory is 3.6 GB. [2018-06-18 13:19:59,858 INFO ]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * SmtParser took 0.07 ms. Allocated memory is still 309.3 MB. Free memory is still 274.8 MB. There was no memory consumed. Max. memory is 3.6 GB. * ChcToBoogie took 71.15 ms. Allocated memory is still 309.3 MB. Free memory was 262.7 MB in the beginning and 260.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. * Boogie Preprocessor took 55.56 ms. Allocated memory is still 309.3 MB. Free memory was 260.7 MB in the beginning and 258.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. * RCFGBuilder took 337.45 ms. Allocated memory is still 309.3 MB. Free memory was 258.7 MB in the beginning and 250.7 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 3.6 GB. * TraceAbstraction took 58901.62 ms. Allocated memory was 309.3 MB in the beginning and 744.5 MB in the end (delta: 435.2 MB). Free memory was 250.7 MB in the beginning and 190.6 MB in the end (delta: 60.1 MB). Peak memory consumption was 495.2 MB. Max. memory is 3.6 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [UNKNOWN] : Timeout (TraceAbstraction) Unable to prove that assertion always holds (line 0). Cancelled while BasicCegarLoop was constructing difference of abstraction (31states) and interpolant automaton (currently 5 states, 43 states before enhancement), while PredicateUnifier was unifying predicates, while SimplifyDDAWithTimeout was simplifying term of DAG size 136. - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 13 locations, 1 error locations. TIMEOUT Result, 58.8s OverallTime, 10 OverallIterations, 11 TraceHistogramMax, 19.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 126 SDtfs, 513 SDslu, 855 SDs, 0 SdLazy, 788 SolverSat, 632 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 460 GetRequests, 203 SyntacticMatches, 11 SemanticMatches, 245 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1294 ImplicationChecksByTransitivity, 46.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 9 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 37.5s InterpolantComputationTime, 563 NumberOfCodeBlocks, 563 NumberOfCodeBlocksAsserted, 46 NumberOfCheckSat, 544 ConstructedInterpolants, 0 QuantifiedInterpolants, 1009100 SizeOfPredicates, 564 NumberOfNonLiveVariables, 1954 ConjunctsInSsa, 475 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 398/1494 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/down.c.smt2_chcToBoogie_automizer.epf_AutomizerCHC.xml/Csv-Benchmark-0-2018-06-18_13-19-59-867.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/down.c.smt2_chcToBoogie_automizer.epf_AutomizerCHC.xml/Csv-TraceAbstractionBenchmarks-0-2018-06-18_13-19-59-867.csv Completed graceful shutdown