java -Xss1g -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/chc/AutomizerCHC/AutomizerCHC_No_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/gulv_simp.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8d74a04 [2018-06-22 15:05:46,899 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-22 15:05:46,901 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-22 15:05:46,916 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-22 15:05:46,916 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-22 15:05:46,917 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-22 15:05:46,918 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-22 15:05:46,920 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-22 15:05:46,921 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-22 15:05:46,922 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-22 15:05:46,924 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-22 15:05:46,924 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-22 15:05:46,925 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-22 15:05:46,926 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-22 15:05:46,926 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-22 15:05:46,929 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-22 15:05:46,931 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-22 15:05:46,940 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-22 15:05:46,942 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-22 15:05:46,942 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-22 15:05:46,943 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-22 15:05:46,949 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-22 15:05:46,949 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-22 15:05:46,949 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-22 15:05:46,950 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-22 15:05:46,951 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-22 15:05:46,951 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-22 15:05:46,954 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-22 15:05:46,955 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-22 15:05:46,955 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-22 15:05:46,956 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-22 15:05:46,956 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-22 15:05:46,957 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-22 15:05:46,957 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-22 15:05:46,962 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-22 15:05:46,963 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_No_Goto.epf [2018-06-22 15:05:46,978 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-22 15:05:46,979 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-22 15:05:46,981 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-22 15:05:46,981 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-22 15:05:46,982 INFO L131 SettingsManager]: Preferences of ChcToBoogie differ from their defaults: [2018-06-22 15:05:46,982 INFO L133 SettingsManager]: * Use one large procedure with gotos to replace tail recursive calls=false [2018-06-22 15:05:46,982 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-22 15:05:46,983 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-22 15:05:46,983 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-22 15:05:46,983 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-22 15:05:46,983 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 15:05:46,984 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-22 15:05:46,984 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-22 15:05:46,984 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-22 15:05:46,984 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-22 15:05:46,984 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-22 15:05:46,984 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-22 15:05:46,985 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-22 15:05:46,985 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-22 15:05:46,987 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-22 15:05:46,987 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-22 15:05:47,034 INFO ]: Repository-Root is: /tmp [2018-06-22 15:05:47,048 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-22 15:05:47,051 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-22 15:05:47,052 INFO ]: Initializing SmtParser... [2018-06-22 15:05:47,053 INFO ]: SmtParser initialized [2018-06-22 15:05:47,053 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/gulv_simp.c.smt2 [2018-06-22 15:05:47,055 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 [2018-06-22 15:05:47,117 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/gulv_simp.c.smt2 unknown [2018-06-22 15:05:47,317 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/gulv_simp.c.smt2 [2018-06-22 15:05:47,323 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-22 15:05:47,328 INFO ]: Walking toolchain with 4 elements. [2018-06-22 15:05:47,329 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-22 15:05:47,330 INFO ]: Initializing ChcToBoogie... [2018-06-22 15:05:47,330 INFO ]: ChcToBoogie initialized [2018-06-22 15:05:47,335 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 03:05:47" (1/1) ... [2018-06-22 15:05:47,381 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47 Unit [2018-06-22 15:05:47,381 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-22 15:05:47,385 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-22 15:05:47,385 INFO ]: Initializing Boogie Preprocessor... [2018-06-22 15:05:47,385 INFO ]: Boogie Preprocessor initialized [2018-06-22 15:05:47,407 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (1/1) ... [2018-06-22 15:05:47,407 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (1/1) ... [2018-06-22 15:05:47,415 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (1/1) ... [2018-06-22 15:05:47,416 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (1/1) ... [2018-06-22 15:05:47,428 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (1/1) ... [2018-06-22 15:05:47,429 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (1/1) ... [2018-06-22 15:05:47,430 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (1/1) ... [2018-06-22 15:05:47,439 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-22 15:05:47,440 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-22 15:05:47,440 INFO ]: Initializing RCFGBuilder... [2018-06-22 15:05:47,440 INFO ]: RCFGBuilder initialized [2018-06-22 15:05:47,441 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (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) [2018-06-22 15:05:47,466 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-22 15:05:47,466 INFO ]: Found specification of procedure False [2018-06-22 15:05:47,466 INFO ]: Found implementation of procedure False [2018-06-22 15:05:47,466 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-22 15:05:47,466 INFO ]: Found specification of procedure state [2018-06-22 15:05:47,466 INFO ]: Found implementation of procedure state [2018-06-22 15:05:47,467 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-22 15:05:47,467 INFO ]: Found specification of procedure Ultimate.START [2018-06-22 15:05:47,467 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 [2018-06-22 15:05:47,729 INFO ]: Using library mode [2018-06-22 15:05:47,730 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 03:05:47 BoogieIcfgContainer [2018-06-22 15:05:47,730 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-22 15:05:47,739 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-22 15:05:47,740 INFO ]: Initializing TraceAbstraction... [2018-06-22 15:05:47,743 INFO ]: TraceAbstraction initialized [2018-06-22 15:05:47,743 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 03:05:47" (1/3) ... [2018-06-22 15:05:47,744 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@738735a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 22.06 03:05:47, skipping insertion in model container [2018-06-22 15:05:47,744 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 03:05:47" (2/3) ... [2018-06-22 15:05:47,744 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@738735a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.06 03:05:47, skipping insertion in model container [2018-06-22 15:05:47,745 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 03:05:47" (3/3) ... [2018-06-22 15:05:47,747 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-22 15:05:47,756 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-22 15:05:47,780 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-22 15:05:47,831 INFO ]: Using default assertion order modulation [2018-06-22 15:05:47,832 INFO ]: Interprodecural is true [2018-06-22 15:05:47,832 INFO ]: Hoare is false [2018-06-22 15:05:47,832 INFO ]: Compute interpolants for FPandBP [2018-06-22 15:05:47,832 INFO ]: Backedges is TWOTRACK [2018-06-22 15:05:47,832 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-22 15:05:47,832 INFO ]: Difference is false [2018-06-22 15:05:47,832 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-22 15:05:47,832 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-22 15:05:47,851 INFO ]: Start isEmpty. Operand 13 states. [2018-06-22 15:05:47,865 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-22 15:05:47,865 INFO ]: Found error trace [2018-06-22 15:05:47,866 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:05:47,867 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:05:47,872 INFO ]: Analyzing trace with hash -597537630, now seen corresponding path program 1 times [2018-06-22 15:05:47,874 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:05:47,875 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:05:47,920 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:47,920 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:05:47,920 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:47,952 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:48,081 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 15:05:48,084 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-22 15:05:48,084 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-22 15:05:48,085 INFO ]: Interpolant automaton has 4 states [2018-06-22 15:05:48,098 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-22 15:05:48,098 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 15:05:48,100 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-22 15:05:48,173 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:05:48,173 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-22 15:05:48,175 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-22 15:05:48,176 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-22 15:05:48,176 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:05:48,186 INFO ]: With dead ends: 13 [2018-06-22 15:05:48,186 INFO ]: Without dead ends: 13 [2018-06-22 15:05:48,187 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 [2018-06-22 15:05:48,203 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-22 15:05:48,225 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-22 15:05:48,227 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-22 15:05:48,228 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-22 15:05:48,229 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-22 15:05:48,229 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:05:48,229 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-22 15:05:48,229 INFO ]: Interpolant automaton has 4 states. [2018-06-22 15:05:48,229 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-22 15:05:48,230 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-22 15:05:48,230 INFO ]: Found error trace [2018-06-22 15:05:48,230 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:05:48,230 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:05:48,231 INFO ]: Analyzing trace with hash 1530833734, now seen corresponding path program 1 times [2018-06-22 15:05:48,231 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:05:48,231 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:05:48,231 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:48,231 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:05:48,231 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:48,272 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:48,496 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 15:05:48,496 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:05:48,496 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 [2018-06-22 15:05:48,508 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:05:48,554 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:48,564 INFO ]: Computing forward predicates... [2018-06-22 15:05:48,757 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 15:05:48,791 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:05:48,791 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-06-22 15:05:48,791 INFO ]: Interpolant automaton has 6 states [2018-06-22 15:05:48,792 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-22 15:05:48,792 INFO ]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-22 15:05:48,792 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 6 states. [2018-06-22 15:05:48,969 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:05:48,969 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-22 15:05:48,970 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-22 15:05:48,970 INFO ]: Start accepts. Automaton has 6 states. Word has length 13 [2018-06-22 15:05:48,971 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:05:48,971 INFO ]: With dead ends: 15 [2018-06-22 15:05:48,971 INFO ]: Without dead ends: 15 [2018-06-22 15:05:48,972 INFO ]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-22 15:05:48,972 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-22 15:05:48,976 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-22 15:05:48,976 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-22 15:05:48,976 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-22 15:05:48,976 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-22 15:05:48,977 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:05:48,977 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-22 15:05:48,977 INFO ]: Interpolant automaton has 6 states. [2018-06-22 15:05:48,977 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-22 15:05:48,977 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-22 15:05:48,977 INFO ]: Found error trace [2018-06-22 15:05:48,977 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:05:48,977 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:05:48,978 INFO ]: Analyzing trace with hash -1486246934, now seen corresponding path program 2 times [2018-06-22 15:05:48,978 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:05:48,978 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:05:48,979 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:48,979 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:05:48,979 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:49,036 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:49,525 WARN ]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2018-06-22 15:05:49,713 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 15:05:49,713 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:05:49,713 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 [2018-06-22 15:05:49,721 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-22 15:05:49,792 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-22 15:05:49,792 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:49,796 INFO ]: Computing forward predicates... [2018-06-22 15:05:49,902 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 15:05:49,925 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:05:49,925 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-06-22 15:05:49,926 INFO ]: Interpolant automaton has 8 states [2018-06-22 15:05:49,926 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-22 15:05:49,926 INFO ]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-06-22 15:05:49,926 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 8 states. [2018-06-22 15:05:50,436 WARN ]: Spent 303.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 18 [2018-06-22 15:05:50,486 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:05:50,486 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-22 15:05:50,487 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-22 15:05:50,487 INFO ]: Start accepts. Automaton has 8 states. Word has length 17 [2018-06-22 15:05:50,487 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:05:50,487 INFO ]: With dead ends: 17 [2018-06-22 15:05:50,487 INFO ]: Without dead ends: 17 [2018-06-22 15:05:50,488 INFO ]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2018-06-22 15:05:50,488 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-22 15:05:50,491 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-22 15:05:50,491 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-22 15:05:50,492 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-22 15:05:50,492 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-22 15:05:50,492 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:05:50,492 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-22 15:05:50,492 INFO ]: Interpolant automaton has 8 states. [2018-06-22 15:05:50,492 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-22 15:05:50,492 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-22 15:05:50,492 INFO ]: Found error trace [2018-06-22 15:05:50,493 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:05:50,493 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:05:50,493 INFO ]: Analyzing trace with hash -2056434034, now seen corresponding path program 3 times [2018-06-22 15:05:50,493 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:05:50,493 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:05:50,494 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:50,494 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:05:50,494 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:50,521 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:50,777 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-22 15:05:50,777 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:05:50,777 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 [2018-06-22 15:05:50,784 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-22 15:05:50,819 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-22 15:05:50,819 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:50,823 INFO ]: Computing forward predicates... [2018-06-22 15:05:51,048 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-22 15:05:51,080 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:05:51,080 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2018-06-22 15:05:51,081 INFO ]: Interpolant automaton has 13 states [2018-06-22 15:05:51,081 INFO ]: Constructing interpolant automaton starting with 13 interpolants. [2018-06-22 15:05:51,081 INFO ]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2018-06-22 15:05:51,081 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 13 states. [2018-06-22 15:05:51,316 WARN ]: Spent 161.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 23 [2018-06-22 15:05:51,603 WARN ]: Spent 114.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2018-06-22 15:05:51,666 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:05:51,666 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-22 15:05:51,667 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-22 15:05:51,667 INFO ]: Start accepts. Automaton has 13 states. Word has length 21 [2018-06-22 15:05:51,667 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:05:51,667 INFO ]: With dead ends: 19 [2018-06-22 15:05:51,667 INFO ]: Without dead ends: 19 [2018-06-22 15:05:51,668 INFO ]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2018-06-22 15:05:51,668 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-22 15:05:51,671 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-22 15:05:51,671 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-22 15:05:51,671 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-22 15:05:51,671 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-22 15:05:51,672 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:05:51,672 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-22 15:05:51,672 INFO ]: Interpolant automaton has 13 states. [2018-06-22 15:05:51,672 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-22 15:05:51,672 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-22 15:05:51,672 INFO ]: Found error trace [2018-06-22 15:05:51,673 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:05:51,673 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:05:51,673 INFO ]: Analyzing trace with hash -434924750, now seen corresponding path program 4 times [2018-06-22 15:05:51,673 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:05:51,673 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:05:51,674 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:51,674 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:05:51,674 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:51,705 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:52,062 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-22 15:05:52,062 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:05:52,062 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 [2018-06-22 15:05:52,070 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-22 15:05:52,098 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-22 15:05:52,098 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:52,101 INFO ]: Computing forward predicates... [2018-06-22 15:05:52,854 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-22 15:05:52,873 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:05:52,873 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2018-06-22 15:05:52,874 INFO ]: Interpolant automaton has 20 states [2018-06-22 15:05:52,874 INFO ]: Constructing interpolant automaton starting with 20 interpolants. [2018-06-22 15:05:52,874 INFO ]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2018-06-22 15:05:52,874 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 20 states. [2018-06-22 15:05:53,176 WARN ]: Spent 280.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 39 [2018-06-22 15:05:53,704 WARN ]: Spent 219.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 35 [2018-06-22 15:05:53,845 WARN ]: Spent 112.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 27 [2018-06-22 15:05:53,879 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:05:53,879 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-22 15:05:53,884 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-22 15:05:53,884 INFO ]: Start accepts. Automaton has 20 states. Word has length 25 [2018-06-22 15:05:53,884 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:05:53,885 INFO ]: With dead ends: 21 [2018-06-22 15:05:53,885 INFO ]: Without dead ends: 21 [2018-06-22 15:05:53,885 INFO ]: 0 DeclaredPredicates, 41 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2018-06-22 15:05:53,885 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-22 15:05:53,888 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-22 15:05:53,889 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-22 15:05:53,889 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-22 15:05:53,889 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-22 15:05:53,889 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:05:53,889 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-22 15:05:53,889 INFO ]: Interpolant automaton has 20 states. [2018-06-22 15:05:53,890 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-22 15:05:53,890 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-22 15:05:53,890 INFO ]: Found error trace [2018-06-22 15:05:53,890 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:05:53,890 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:05:53,892 INFO ]: Analyzing trace with hash 1986427350, now seen corresponding path program 5 times [2018-06-22 15:05:53,892 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:05:53,893 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:05:53,893 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:53,893 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:05:53,893 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:53,946 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:54,713 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-22 15:05:54,714 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:05:54,714 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 [2018-06-22 15:05:54,720 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-22 15:05:54,833 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-22 15:05:54,833 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:54,838 INFO ]: Computing forward predicates... [2018-06-22 15:05:55,556 WARN ]: Spent 450.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 33 [2018-06-22 15:05:57,150 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-22 15:05:57,169 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:05:57,169 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2018-06-22 15:05:57,170 INFO ]: Interpolant automaton has 21 states [2018-06-22 15:05:57,170 INFO ]: Constructing interpolant automaton starting with 21 interpolants. [2018-06-22 15:05:57,170 INFO ]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2018-06-22 15:05:57,170 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 21 states. [2018-06-22 15:05:57,739 WARN ]: Spent 521.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 63 [2018-06-22 15:05:57,915 WARN ]: Spent 138.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 32 [2018-06-22 15:05:58,143 WARN ]: Spent 198.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 32 [2018-06-22 15:05:58,656 WARN ]: Spent 491.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 52 [2018-06-22 15:05:58,925 WARN ]: Spent 240.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 46 [2018-06-22 15:05:59,369 WARN ]: Spent 416.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 60 [2018-06-22 15:05:59,504 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:05:59,504 INFO ]: Finished difference Result 23 states and 24 transitions. [2018-06-22 15:05:59,505 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-06-22 15:05:59,505 INFO ]: Start accepts. Automaton has 21 states. Word has length 29 [2018-06-22 15:05:59,505 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:05:59,505 INFO ]: With dead ends: 23 [2018-06-22 15:05:59,505 INFO ]: Without dead ends: 23 [2018-06-22 15:05:59,506 INFO ]: 0 DeclaredPredicates, 49 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=144, Invalid=612, Unknown=0, NotChecked=0, Total=756 [2018-06-22 15:05:59,506 INFO ]: Start minimizeSevpa. Operand 23 states. [2018-06-22 15:05:59,510 INFO ]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-06-22 15:05:59,510 INFO ]: Start removeUnreachable. Operand 23 states. [2018-06-22 15:05:59,510 INFO ]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-06-22 15:05:59,510 INFO ]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 29 [2018-06-22 15:05:59,511 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:05:59,511 INFO ]: Abstraction has 23 states and 24 transitions. [2018-06-22 15:05:59,511 INFO ]: Interpolant automaton has 21 states. [2018-06-22 15:05:59,511 INFO ]: Start isEmpty. Operand 23 states and 24 transitions. [2018-06-22 15:05:59,511 INFO ]: Finished isEmpty. Found accepting run of length 34 [2018-06-22 15:05:59,511 INFO ]: Found error trace [2018-06-22 15:05:59,512 INFO ]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:05:59,512 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:05:59,513 INFO ]: Analyzing trace with hash 800064122, now seen corresponding path program 6 times [2018-06-22 15:05:59,513 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:05:59,513 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:05:59,514 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:59,514 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:05:59,514 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:05:59,579 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:05:59,822 WARN ]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2018-06-22 15:06:00,603 WARN ]: Spent 720.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2018-06-22 15:06:00,721 WARN ]: Spent 111.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 38 [2018-06-22 15:06:01,329 INFO ]: Checked inductivity of 78 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-06-22 15:06:01,329 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:06:01,329 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 15:06:01,341 INFO ]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-06-22 15:06:01,398 INFO ]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-06-22 15:06:01,398 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:06:01,402 INFO ]: Computing forward predicates... [2018-06-22 15:06:01,863 WARN ]: Spent 329.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 31 [2018-06-22 15:06:02,139 WARN ]: Spent 233.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 34 [2018-06-22 15:06:02,348 WARN ]: Spent 134.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 31 [2018-06-22 15:06:03,001 INFO ]: Checked inductivity of 78 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-06-22 15:06:03,031 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:06:03,031 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2018-06-22 15:06:03,032 INFO ]: Interpolant automaton has 26 states [2018-06-22 15:06:03,032 INFO ]: Constructing interpolant automaton starting with 26 interpolants. [2018-06-22 15:06:03,032 INFO ]: CoverageRelationStatistics Valid=75, Invalid=575, Unknown=0, NotChecked=0, Total=650 [2018-06-22 15:06:03,032 INFO ]: Start difference. First operand 23 states and 24 transitions. Second operand 26 states. [2018-06-22 15:06:03,741 WARN ]: Spent 565.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 87 [2018-06-22 15:06:03,966 WARN ]: Spent 174.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 32 [2018-06-22 15:06:04,174 WARN ]: Spent 182.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 36 [2018-06-22 15:06:04,470 WARN ]: Spent 269.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 48 [2018-06-22 15:06:04,758 WARN ]: Spent 258.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 46 [2018-06-22 15:06:05,208 WARN ]: Spent 419.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 51 [2018-06-22 15:06:05,752 WARN ]: Spent 431.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 69 [2018-06-22 15:06:05,809 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:06:05,809 INFO ]: Finished difference Result 25 states and 26 transitions. [2018-06-22 15:06:05,810 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-06-22 15:06:05,810 INFO ]: Start accepts. Automaton has 26 states. Word has length 33 [2018-06-22 15:06:05,810 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:06:05,811 INFO ]: With dead ends: 25 [2018-06-22 15:06:05,811 INFO ]: Without dead ends: 25 [2018-06-22 15:06:05,812 INFO ]: 0 DeclaredPredicates, 56 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=195, Invalid=927, Unknown=0, NotChecked=0, Total=1122 [2018-06-22 15:06:05,812 INFO ]: Start minimizeSevpa. Operand 25 states. [2018-06-22 15:06:05,816 INFO ]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-06-22 15:06:05,816 INFO ]: Start removeUnreachable. Operand 25 states. [2018-06-22 15:06:05,817 INFO ]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-06-22 15:06:05,817 INFO ]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 33 [2018-06-22 15:06:05,817 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:06:05,817 INFO ]: Abstraction has 25 states and 26 transitions. [2018-06-22 15:06:05,817 INFO ]: Interpolant automaton has 26 states. [2018-06-22 15:06:05,817 INFO ]: Start isEmpty. Operand 25 states and 26 transitions. [2018-06-22 15:06:05,818 INFO ]: Finished isEmpty. Found accepting run of length 38 [2018-06-22 15:06:05,818 INFO ]: Found error trace [2018-06-22 15:06:05,818 INFO ]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:06:05,818 INFO ]: === Iteration 8 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:06:05,818 INFO ]: Analyzing trace with hash -411423458, now seen corresponding path program 7 times [2018-06-22 15:06:05,818 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:06:05,818 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:06:05,819 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:06:05,819 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:06:05,819 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:06:05,876 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:06:06,854 WARN ]: Spent 733.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-06-22 15:06:07,078 WARN ]: Spent 154.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 31 [2018-06-22 15:06:07,616 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-22 15:06:07,617 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:06:07,617 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 [2018-06-22 15:06:07,623 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:06:07,675 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:06:07,681 INFO ]: Computing forward predicates... [2018-06-22 15:06:07,912 WARN ]: Spent 174.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 30 [2018-06-22 15:06:08,343 WARN ]: Spent 218.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 34 [2018-06-22 15:06:09,174 INFO ]: Checked inductivity of 105 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-06-22 15:06:09,193 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:06:09,193 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2018-06-22 15:06:09,194 INFO ]: Interpolant automaton has 27 states [2018-06-22 15:06:09,194 INFO ]: Constructing interpolant automaton starting with 27 interpolants. [2018-06-22 15:06:09,194 INFO ]: CoverageRelationStatistics Valid=87, Invalid=615, Unknown=0, NotChecked=0, Total=702 [2018-06-22 15:06:09,194 INFO ]: Start difference. First operand 25 states and 26 transitions. Second operand 27 states. [2018-06-22 15:06:09,690 WARN ]: Spent 392.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 83 [2018-06-22 15:06:09,964 WARN ]: Spent 226.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 33 [2018-06-22 15:06:10,163 WARN ]: Spent 163.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 32 [2018-06-22 15:06:10,479 WARN ]: Spent 278.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 50 [2018-06-22 15:06:10,735 WARN ]: Spent 221.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 42 [2018-06-22 15:06:11,062 WARN ]: Spent 298.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 52 [2018-06-22 15:06:11,492 WARN ]: Spent 403.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 49 [2018-06-22 15:06:12,233 WARN ]: Spent 703.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 79 [2018-06-22 15:06:12,264 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:06:12,264 INFO ]: Finished difference Result 27 states and 28 transitions. [2018-06-22 15:06:12,266 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-06-22 15:06:12,266 INFO ]: Start accepts. Automaton has 27 states. Word has length 37 [2018-06-22 15:06:12,266 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:06:12,267 INFO ]: With dead ends: 27 [2018-06-22 15:06:12,267 INFO ]: Without dead ends: 27 [2018-06-22 15:06:12,268 INFO ]: 0 DeclaredPredicates, 63 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=225, Invalid=1035, Unknown=0, NotChecked=0, Total=1260 [2018-06-22 15:06:12,268 INFO ]: Start minimizeSevpa. Operand 27 states. [2018-06-22 15:06:12,271 INFO ]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-06-22 15:06:12,271 INFO ]: Start removeUnreachable. Operand 27 states. [2018-06-22 15:06:12,272 INFO ]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-06-22 15:06:12,272 INFO ]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 37 [2018-06-22 15:06:12,272 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:06:12,272 INFO ]: Abstraction has 27 states and 28 transitions. [2018-06-22 15:06:12,272 INFO ]: Interpolant automaton has 27 states. [2018-06-22 15:06:12,272 INFO ]: Start isEmpty. Operand 27 states and 28 transitions. [2018-06-22 15:06:12,273 INFO ]: Finished isEmpty. Found accepting run of length 42 [2018-06-22 15:06:12,273 INFO ]: Found error trace [2018-06-22 15:06:12,273 INFO ]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:06:12,273 INFO ]: === Iteration 9 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:06:12,274 INFO ]: Analyzing trace with hash -544278078, now seen corresponding path program 8 times [2018-06-22 15:06:12,274 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:06:12,274 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:06:12,275 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:06:12,275 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 15:06:12,275 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:06:12,329 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:06:12,789 WARN ]: Spent 130.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 39 [2018-06-22 15:06:13,533 INFO ]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-06-22 15:06:13,533 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:06:13,533 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 [2018-06-22 15:06:13,540 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-22 15:06:13,588 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-22 15:06:13,588 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:06:13,593 INFO ]: Computing forward predicates... [2018-06-22 15:06:14,002 WARN ]: Spent 339.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 30 [2018-06-22 15:06:14,289 WARN ]: Spent 227.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2018-06-22 15:06:14,480 WARN ]: Spent 114.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 31 [2018-06-22 15:06:15,360 INFO ]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-06-22 15:06:15,379 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 15:06:15,379 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 30 [2018-06-22 15:06:15,380 INFO ]: Interpolant automaton has 30 states [2018-06-22 15:06:15,380 INFO ]: Constructing interpolant automaton starting with 30 interpolants. [2018-06-22 15:06:15,380 INFO ]: CoverageRelationStatistics Valid=89, Invalid=781, Unknown=0, NotChecked=0, Total=870 [2018-06-22 15:06:15,380 INFO ]: Start difference. First operand 27 states and 28 transitions. Second operand 30 states. [2018-06-22 15:06:16,172 WARN ]: Spent 742.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 93 [2018-06-22 15:06:16,596 WARN ]: Spent 324.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 40 [2018-06-22 15:06:16,933 WARN ]: Spent 242.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 36 [2018-06-22 15:06:17,224 WARN ]: Spent 255.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 38 [2018-06-22 15:06:17,522 WARN ]: Spent 264.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 41 [2018-06-22 15:06:17,986 WARN ]: Spent 415.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 47 [2018-06-22 15:06:18,500 WARN ]: Spent 474.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 51 [2018-06-22 15:06:18,946 WARN ]: Spent 386.00 ms on a formula simplification. DAG size of input: 124 DAG size of output: 61 [2018-06-22 15:06:19,673 WARN ]: Spent 686.00 ms on a formula simplification. DAG size of input: 118 DAG size of output: 90 [2018-06-22 15:06:19,710 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 15:06:19,710 INFO ]: Finished difference Result 29 states and 30 transitions. [2018-06-22 15:06:19,711 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-06-22 15:06:19,711 INFO ]: Start accepts. Automaton has 30 states. Word has length 41 [2018-06-22 15:06:19,711 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 15:06:19,711 INFO ]: With dead ends: 29 [2018-06-22 15:06:19,711 INFO ]: Without dead ends: 29 [2018-06-22 15:06:19,712 INFO ]: 0 DeclaredPredicates, 70 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=265, Invalid=1295, Unknown=0, NotChecked=0, Total=1560 [2018-06-22 15:06:19,712 INFO ]: Start minimizeSevpa. Operand 29 states. [2018-06-22 15:06:19,716 INFO ]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-06-22 15:06:19,716 INFO ]: Start removeUnreachable. Operand 29 states. [2018-06-22 15:06:19,717 INFO ]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-06-22 15:06:19,717 INFO ]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 41 [2018-06-22 15:06:19,717 INFO ]: Finished accepts. word is rejected. [2018-06-22 15:06:19,717 INFO ]: Abstraction has 29 states and 30 transitions. [2018-06-22 15:06:19,717 INFO ]: Interpolant automaton has 30 states. [2018-06-22 15:06:19,717 INFO ]: Start isEmpty. Operand 29 states and 30 transitions. [2018-06-22 15:06:19,718 INFO ]: Finished isEmpty. Found accepting run of length 46 [2018-06-22 15:06:19,718 INFO ]: Found error trace [2018-06-22 15:06:19,718 INFO ]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 15:06:19,718 INFO ]: === Iteration 10 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 15:06:19,718 INFO ]: Analyzing trace with hash 1442343014, now seen corresponding path program 9 times [2018-06-22 15:06:19,718 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 15:06:19,718 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 15:06:19,722 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:06:19,722 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 15:06:19,722 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 15:06:19,801 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:06:20,433 WARN ]: Spent 142.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 49 [2018-06-22 15:06:20,638 WARN ]: Spent 189.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 38 [2018-06-22 15:06:21,204 INFO ]: Checked inductivity of 171 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-06-22 15:06:21,204 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 15:06:21,205 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 [2018-06-22 15:06:21,210 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-22 15:06:21,265 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-06-22 15:06:21,265 INFO ]: Conjunction of SSA is unsat [2018-06-22 15:06:21,281 INFO ]: Computing forward predicates... [2018-06-22 15:06:24,978 WARN ]: Spent 3.22 s on a formula simplification. DAG size of input: 573 DAG size of output: 78 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown