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_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/dillig17.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8d74a04 [2018-06-22 05:16:45,307 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-22 05:16:45,343 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-22 05:16:45,370 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-22 05:16:45,370 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-22 05:16:45,371 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-22 05:16:45,372 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-22 05:16:45,378 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-22 05:16:45,380 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-22 05:16:45,382 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-22 05:16:45,383 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-22 05:16:45,383 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-22 05:16:45,384 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-22 05:16:45,388 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-22 05:16:45,389 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-22 05:16:45,390 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-22 05:16:45,403 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-22 05:16:45,405 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-22 05:16:45,407 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-22 05:16:45,408 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-22 05:16:45,409 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-22 05:16:45,411 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-22 05:16:45,413 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-22 05:16:45,413 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-22 05:16:45,414 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-22 05:16:45,415 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-22 05:16:45,416 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-22 05:16:45,417 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-22 05:16:45,418 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-22 05:16:45,418 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-22 05:16:45,419 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-22 05:16:45,419 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-22 05:16:45,419 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-22 05:16:45,420 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-22 05:16:45,421 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-22 05:16:45,421 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-22 05:16:45,447 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-22 05:16:45,447 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-22 05:16:45,448 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-22 05:16:45,448 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-22 05:16:45,449 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-22 05:16:45,449 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-22 05:16:45,449 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-22 05:16:45,449 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-22 05:16:45,450 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 05:16:45,450 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-22 05:16:45,450 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-22 05:16:45,450 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-22 05:16:45,450 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-22 05:16:45,451 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-22 05:16:45,451 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-22 05:16:45,451 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-22 05:16:45,451 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-22 05:16:45,453 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-22 05:16:45,453 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-22 05:16:45,502 INFO ]: Repository-Root is: /tmp [2018-06-22 05:16:45,602 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-22 05:16:45,605 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-22 05:16:45,606 INFO ]: Initializing SmtParser... [2018-06-22 05:16:45,606 INFO ]: SmtParser initialized [2018-06-22 05:16:45,607 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/dillig17.c.smt2 [2018-06-22 05:16:45,608 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 05:16:46,215 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/dillig17.c.smt2 unknown [2018-06-22 05:16:46,963 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/dillig17.c.smt2 [2018-06-22 05:16:46,969 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-22 05:16:46,975 INFO ]: Walking toolchain with 4 elements. [2018-06-22 05:16:46,976 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-22 05:16:46,976 INFO ]: Initializing ChcToBoogie... [2018-06-22 05:16:46,976 INFO ]: ChcToBoogie initialized [2018-06-22 05:16:47,025 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 05:16:46" (1/1) ... [2018-06-22 05:16:47,144 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47 Unit [2018-06-22 05:16:47,144 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-22 05:16:47,145 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-22 05:16:47,145 INFO ]: Initializing Boogie Preprocessor... [2018-06-22 05:16:47,145 INFO ]: Boogie Preprocessor initialized [2018-06-22 05:16:47,257 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (1/1) ... [2018-06-22 05:16:47,257 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (1/1) ... [2018-06-22 05:16:47,263 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (1/1) ... [2018-06-22 05:16:47,263 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (1/1) ... [2018-06-22 05:16:47,267 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (1/1) ... [2018-06-22 05:16:47,274 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (1/1) ... [2018-06-22 05:16:47,275 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (1/1) ... [2018-06-22 05:16:47,277 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-22 05:16:47,278 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-22 05:16:47,278 INFO ]: Initializing RCFGBuilder... [2018-06-22 05:16:47,278 INFO ]: RCFGBuilder initialized [2018-06-22 05:16:47,279 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (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) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 05:16:47,315 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-22 05:16:47,315 INFO ]: Found specification of procedure gotoProc [2018-06-22 05:16:47,316 INFO ]: Found implementation of procedure gotoProc [2018-06-22 05:16:47,316 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-22 05:16:47,316 INFO ]: Found specification of procedure Ultimate.START [2018-06-22 05:16:47,316 INFO ]: Found implementation of procedure Ultimate.START [2018-06-22 05:16:47,548 INFO ]: Using library mode [2018-06-22 05:16:47,548 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 05:16:47 BoogieIcfgContainer [2018-06-22 05:16:47,548 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-22 05:16:47,550 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-22 05:16:47,550 INFO ]: Initializing TraceAbstraction... [2018-06-22 05:16:47,605 INFO ]: TraceAbstraction initialized [2018-06-22 05:16:47,605 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 05:16:46" (1/3) ... [2018-06-22 05:16:47,606 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f0eebe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 22.06 05:16:47, skipping insertion in model container [2018-06-22 05:16:47,606 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 05:16:47" (2/3) ... [2018-06-22 05:16:47,606 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f0eebe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.06 05:16:47, skipping insertion in model container [2018-06-22 05:16:47,607 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 05:16:47" (3/3) ... [2018-06-22 05:16:47,608 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-22 05:16:47,697 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-22 05:16:47,729 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-22 05:16:48,597 INFO ]: Using default assertion order modulation [2018-06-22 05:16:48,597 INFO ]: Interprodecural is true [2018-06-22 05:16:48,598 INFO ]: Hoare is false [2018-06-22 05:16:48,598 INFO ]: Compute interpolants for FPandBP [2018-06-22 05:16:48,598 INFO ]: Backedges is TWOTRACK [2018-06-22 05:16:48,598 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-22 05:16:48,598 INFO ]: Difference is false [2018-06-22 05:16:48,598 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-22 05:16:48,598 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-22 05:16:48,694 INFO ]: Start isEmpty. Operand 10 states. [2018-06-22 05:16:48,789 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-22 05:16:48,789 INFO ]: Found error trace [2018-06-22 05:16:48,809 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-06-22 05:16:48,809 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 05:16:48,826 INFO ]: Analyzing trace with hash 1284994894, now seen corresponding path program 1 times [2018-06-22 05:16:48,828 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 05:16:48,828 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 05:16:48,865 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:48,865 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 05:16:48,865 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:48,901 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:48,969 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:48,971 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-22 05:16:48,971 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-22 05:16:48,973 INFO ]: Interpolant automaton has 3 states [2018-06-22 05:16:48,983 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-22 05:16:48,983 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-22 05:16:48,985 INFO ]: Start difference. First operand 10 states. Second operand 3 states. [2018-06-22 05:16:49,067 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 05:16:49,067 INFO ]: Finished difference Result 9 states and 9 transitions. [2018-06-22 05:16:49,067 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-22 05:16:49,069 INFO ]: Start accepts. Automaton has 3 states. Word has length 7 [2018-06-22 05:16:49,069 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 05:16:49,077 INFO ]: With dead ends: 9 [2018-06-22 05:16:49,078 INFO ]: Without dead ends: 9 [2018-06-22 05:16:49,079 INFO ]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-22 05:16:49,098 INFO ]: Start minimizeSevpa. Operand 9 states. [2018-06-22 05:16:49,135 INFO ]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-06-22 05:16:49,137 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-22 05:16:49,137 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-06-22 05:16:49,147 INFO ]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-06-22 05:16:49,148 INFO ]: Finished accepts. word is rejected. [2018-06-22 05:16:49,148 INFO ]: Abstraction has 9 states and 9 transitions. [2018-06-22 05:16:49,148 INFO ]: Interpolant automaton has 3 states. [2018-06-22 05:16:49,148 INFO ]: Start isEmpty. Operand 9 states and 9 transitions. [2018-06-22 05:16:49,148 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-22 05:16:49,148 INFO ]: Found error trace [2018-06-22 05:16:49,148 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 05:16:49,148 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 05:16:49,148 INFO ]: Analyzing trace with hash 1180964567, now seen corresponding path program 1 times [2018-06-22 05:16:49,148 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 05:16:49,148 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 05:16:49,149 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:49,149 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 05:16:49,149 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:49,205 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:49,402 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:49,402 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 05:16:49,402 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 05:16:49,412 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 05:16:49,460 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:49,471 INFO ]: Computing forward predicates... [2018-06-22 05:16:49,684 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:49,705 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 05:16:49,705 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-06-22 05:16:49,706 INFO ]: Interpolant automaton has 4 states [2018-06-22 05:16:49,706 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-22 05:16:49,706 INFO ]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-22 05:16:49,706 INFO ]: Start difference. First operand 9 states and 9 transitions. Second operand 4 states. [2018-06-22 05:16:49,795 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 05:16:49,795 INFO ]: Finished difference Result 10 states and 10 transitions. [2018-06-22 05:16:49,796 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-22 05:16:49,796 INFO ]: Start accepts. Automaton has 4 states. Word has length 8 [2018-06-22 05:16:49,796 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 05:16:49,796 INFO ]: With dead ends: 10 [2018-06-22 05:16:49,796 INFO ]: Without dead ends: 10 [2018-06-22 05:16:49,797 INFO ]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-22 05:16:49,797 INFO ]: Start minimizeSevpa. Operand 10 states. [2018-06-22 05:16:49,798 INFO ]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-06-22 05:16:49,798 INFO ]: Start removeUnreachable. Operand 10 states. [2018-06-22 05:16:49,799 INFO ]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-06-22 05:16:49,799 INFO ]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-06-22 05:16:49,799 INFO ]: Finished accepts. word is rejected. [2018-06-22 05:16:49,799 INFO ]: Abstraction has 10 states and 10 transitions. [2018-06-22 05:16:49,799 INFO ]: Interpolant automaton has 4 states. [2018-06-22 05:16:49,799 INFO ]: Start isEmpty. Operand 10 states and 10 transitions. [2018-06-22 05:16:49,800 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-22 05:16:49,800 INFO ]: Found error trace [2018-06-22 05:16:49,800 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 05:16:49,800 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 05:16:49,800 INFO ]: Analyzing trace with hash -2043975570, now seen corresponding path program 2 times [2018-06-22 05:16:49,800 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 05:16:49,800 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 05:16:49,801 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:49,801 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 05:16:49,801 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:49,876 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:50,156 WARN ]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2018-06-22 05:16:50,157 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:50,157 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 05:16:50,157 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) [2018-06-22 05:16:50,173 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 05:16:50,244 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-22 05:16:50,244 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:50,248 INFO ]: Computing forward predicates... [2018-06-22 05:16:50,960 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:50,992 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 05:16:50,992 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-22 05:16:50,992 INFO ]: Interpolant automaton has 6 states [2018-06-22 05:16:50,992 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-22 05:16:50,992 INFO ]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-06-22 05:16:50,992 INFO ]: Start difference. First operand 10 states and 10 transitions. Second operand 6 states. [2018-06-22 05:16:51,333 WARN ]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-06-22 05:16:51,390 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 05:16:51,390 INFO ]: Finished difference Result 11 states and 11 transitions. [2018-06-22 05:16:51,391 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-22 05:16:51,391 INFO ]: Start accepts. Automaton has 6 states. Word has length 9 [2018-06-22 05:16:51,392 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 05:16:51,392 INFO ]: With dead ends: 11 [2018-06-22 05:16:51,392 INFO ]: Without dead ends: 11 [2018-06-22 05:16:51,392 INFO ]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2018-06-22 05:16:51,392 INFO ]: Start minimizeSevpa. Operand 11 states. [2018-06-22 05:16:51,395 INFO ]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-06-22 05:16:51,395 INFO ]: Start removeUnreachable. Operand 11 states. [2018-06-22 05:16:51,395 INFO ]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-06-22 05:16:51,395 INFO ]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-06-22 05:16:51,395 INFO ]: Finished accepts. word is rejected. [2018-06-22 05:16:51,395 INFO ]: Abstraction has 11 states and 11 transitions. [2018-06-22 05:16:51,395 INFO ]: Interpolant automaton has 6 states. [2018-06-22 05:16:51,395 INFO ]: Start isEmpty. Operand 11 states and 11 transitions. [2018-06-22 05:16:51,395 INFO ]: Finished isEmpty. Found accepting run of length 11 [2018-06-22 05:16:51,396 INFO ]: Found error trace [2018-06-22 05:16:51,396 INFO ]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 05:16:51,396 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 05:16:51,396 INFO ]: Analyzing trace with hash 1062095287, now seen corresponding path program 3 times [2018-06-22 05:16:51,396 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 05:16:51,396 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 05:16:51,397 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:51,397 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 05:16:51,397 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:51,437 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:51,574 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:51,574 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 05:16:51,574 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 05:16:51,580 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-22 05:16:51,659 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-22 05:16:51,659 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:51,662 INFO ]: Computing forward predicates... [2018-06-22 05:16:52,961 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:52,986 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 05:16:52,986 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2018-06-22 05:16:52,987 INFO ]: Interpolant automaton has 7 states [2018-06-22 05:16:52,987 INFO ]: Constructing interpolant automaton starting with 7 interpolants. [2018-06-22 05:16:52,987 INFO ]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2018-06-22 05:16:52,987 INFO ]: Start difference. First operand 11 states and 11 transitions. Second operand 7 states. [2018-06-22 05:16:53,165 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 05:16:53,165 INFO ]: Finished difference Result 12 states and 12 transitions. [2018-06-22 05:16:53,165 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-22 05:16:53,165 INFO ]: Start accepts. Automaton has 7 states. Word has length 10 [2018-06-22 05:16:53,165 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 05:16:53,165 INFO ]: With dead ends: 12 [2018-06-22 05:16:53,165 INFO ]: Without dead ends: 12 [2018-06-22 05:16:53,166 INFO ]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2018-06-22 05:16:53,166 INFO ]: Start minimizeSevpa. Operand 12 states. [2018-06-22 05:16:53,167 INFO ]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-06-22 05:16:53,167 INFO ]: Start removeUnreachable. Operand 12 states. [2018-06-22 05:16:53,168 INFO ]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-06-22 05:16:53,168 INFO ]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-06-22 05:16:53,168 INFO ]: Finished accepts. word is rejected. [2018-06-22 05:16:53,168 INFO ]: Abstraction has 12 states and 12 transitions. [2018-06-22 05:16:53,168 INFO ]: Interpolant automaton has 7 states. [2018-06-22 05:16:53,168 INFO ]: Start isEmpty. Operand 12 states and 12 transitions. [2018-06-22 05:16:53,168 INFO ]: Finished isEmpty. Found accepting run of length 12 [2018-06-22 05:16:53,168 INFO ]: Found error trace [2018-06-22 05:16:53,168 INFO ]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 05:16:53,168 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 05:16:53,169 INFO ]: Analyzing trace with hash -1433955954, now seen corresponding path program 4 times [2018-06-22 05:16:53,169 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 05:16:53,169 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 05:16:53,169 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:53,169 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 05:16:53,169 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:53,204 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:53,398 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:53,398 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 05:16:53,398 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 05:16:53,404 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-22 05:16:53,435 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-22 05:16:53,435 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:53,441 INFO ]: Computing forward predicates... [2018-06-22 05:16:57,810 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:57,845 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 05:16:57,845 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2018-06-22 05:16:57,845 INFO ]: Interpolant automaton has 8 states [2018-06-22 05:16:57,846 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-22 05:16:57,846 INFO ]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-06-22 05:16:57,846 INFO ]: Start difference. First operand 12 states and 12 transitions. Second operand 8 states. [2018-06-22 05:16:58,216 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 05:16:58,216 INFO ]: Finished difference Result 13 states and 13 transitions. [2018-06-22 05:16:58,216 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-22 05:16:58,216 INFO ]: Start accepts. Automaton has 8 states. Word has length 11 [2018-06-22 05:16:58,216 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 05:16:58,217 INFO ]: With dead ends: 13 [2018-06-22 05:16:58,217 INFO ]: Without dead ends: 13 [2018-06-22 05:16:58,217 INFO ]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-06-22 05:16:58,217 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-22 05:16:58,218 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-22 05:16:58,218 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-22 05:16:58,219 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-06-22 05:16:58,219 INFO ]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-06-22 05:16:58,219 INFO ]: Finished accepts. word is rejected. [2018-06-22 05:16:58,219 INFO ]: Abstraction has 13 states and 13 transitions. [2018-06-22 05:16:58,219 INFO ]: Interpolant automaton has 8 states. [2018-06-22 05:16:58,219 INFO ]: Start isEmpty. Operand 13 states and 13 transitions. [2018-06-22 05:16:58,219 INFO ]: Finished isEmpty. Found accepting run of length 13 [2018-06-22 05:16:58,219 INFO ]: Found error trace [2018-06-22 05:16:58,219 INFO ]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 05:16:58,220 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 05:16:58,220 INFO ]: Analyzing trace with hash -1502133097, now seen corresponding path program 5 times [2018-06-22 05:16:58,220 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 05:16:58,220 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 05:16:58,220 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:58,220 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 05:16:58,220 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:16:58,303 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:58,916 WARN ]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2018-06-22 05:16:59,081 INFO ]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:16:59,081 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 05:16:59,081 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 05:16:59,091 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-22 05:16:59,184 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-06-22 05:16:59,184 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:16:59,188 INFO ]: Computing forward predicates... [2018-06-22 05:17:01,487 WARN ]: expecting exponential blowup for input size 6 [2018-06-22 05:17:05,994 WARN ]: Spent 139.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 21 [2018-06-22 05:17:06,816 INFO ]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:17:06,837 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 05:17:06,837 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2018-06-22 05:17:06,837 INFO ]: Interpolant automaton has 11 states [2018-06-22 05:17:06,838 INFO ]: Constructing interpolant automaton starting with 11 interpolants. [2018-06-22 05:17:06,838 INFO ]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2018-06-22 05:17:06,838 INFO ]: Start difference. First operand 13 states and 13 transitions. Second operand 11 states. [2018-06-22 05:17:07,108 WARN ]: Spent 115.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2018-06-22 05:17:07,223 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 05:17:07,224 INFO ]: Finished difference Result 14 states and 14 transitions. [2018-06-22 05:17:07,224 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-22 05:17:07,224 INFO ]: Start accepts. Automaton has 11 states. Word has length 12 [2018-06-22 05:17:07,224 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 05:17:07,224 INFO ]: With dead ends: 14 [2018-06-22 05:17:07,224 INFO ]: Without dead ends: 14 [2018-06-22 05:17:07,224 INFO ]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2018-06-22 05:17:07,224 INFO ]: Start minimizeSevpa. Operand 14 states. [2018-06-22 05:17:07,225 INFO ]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-06-22 05:17:07,225 INFO ]: Start removeUnreachable. Operand 14 states. [2018-06-22 05:17:07,226 INFO ]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-06-22 05:17:07,226 INFO ]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-06-22 05:17:07,226 INFO ]: Finished accepts. word is rejected. [2018-06-22 05:17:07,226 INFO ]: Abstraction has 14 states and 14 transitions. [2018-06-22 05:17:07,226 INFO ]: Interpolant automaton has 11 states. [2018-06-22 05:17:07,226 INFO ]: Start isEmpty. Operand 14 states and 14 transitions. [2018-06-22 05:17:07,226 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-22 05:17:07,226 INFO ]: Found error trace [2018-06-22 05:17:07,226 INFO ]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 05:17:07,226 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 05:17:07,226 INFO ]: Analyzing trace with hash 679342766, now seen corresponding path program 6 times [2018-06-22 05:17:07,226 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 05:17:07,227 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 05:17:07,227 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:17:07,227 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 05:17:07,227 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 05:17:07,320 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:17:08,224 WARN ]: Spent 664.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 16 [2018-06-22 05:17:08,366 INFO ]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 05:17:08,367 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 05:17:08,367 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) [2018-06-22 05:17:08,381 INFO ]: Keeping assertion order MIX_INSIDE_OUTSIDE Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 05:17:08,479 INFO ]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-06-22 05:17:08,479 INFO ]: Conjunction of SSA is unsat [2018-06-22 05:17:08,489 INFO ]: Computing forward predicates... [2018-06-22 05:17:08,748 WARN ]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 9 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown