java -Xss4m -Xmx4000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCHC_wBE.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/nested6.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-14921ce [2018-06-25 01:11:10,824 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-25 01:11:10,829 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-25 01:11:10,842 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-25 01:11:10,843 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-25 01:11:10,844 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-25 01:11:10,847 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-25 01:11:10,849 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-25 01:11:10,851 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-25 01:11:10,851 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-25 01:11:10,854 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-25 01:11:10,854 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-25 01:11:10,855 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-25 01:11:10,856 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-25 01:11:10,856 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-25 01:11:10,859 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-25 01:11:10,861 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-25 01:11:10,870 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-25 01:11:10,872 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-25 01:11:10,873 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-25 01:11:10,874 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-25 01:11:10,880 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-25 01:11:10,880 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-25 01:11:10,880 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-25 01:11:10,881 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-25 01:11:10,884 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-25 01:11:10,885 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-25 01:11:10,886 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-25 01:11:10,887 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-25 01:11:10,890 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-25 01:11:10,891 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-25 01:11:10,892 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-25 01:11:10,892 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-25 01:11:10,893 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-25 01:11:10,893 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-25 01:11:10,894 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-25 01:11:10,918 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-25 01:11:10,918 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-25 01:11:10,918 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-25 01:11:10,919 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-25 01:11:10,920 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-06-25 01:11:10,920 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-06-25 01:11:10,920 INFO L133 SettingsManager]: * Create interprocedural compositions=false [2018-06-25 01:11:10,921 INFO L133 SettingsManager]: * Use SBE=true [2018-06-25 01:11:10,921 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-25 01:11:10,921 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-25 01:11:10,921 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-25 01:11:10,922 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-25 01:11:10,922 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 01:11:10,922 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-25 01:11:10,922 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-25 01:11:10,922 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-25 01:11:10,923 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-25 01:11:10,923 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-25 01:11:10,923 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-25 01:11:10,923 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-25 01:11:10,923 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-25 01:11:10,925 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-25 01:11:10,925 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-25 01:11:10,975 INFO ]: Repository-Root is: /tmp [2018-06-25 01:11:10,992 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-25 01:11:10,998 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-25 01:11:11,000 INFO ]: Initializing SmtParser... [2018-06-25 01:11:11,000 INFO ]: SmtParser initialized [2018-06-25 01:11:11,001 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested6.c.smt2 [2018-06-25 01:11:11,002 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 [2018-06-25 01:11:11,090 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested6.c.smt2 unknown [2018-06-25 01:11:11,426 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested6.c.smt2 [2018-06-25 01:11:11,433 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-25 01:11:11,439 INFO ]: Walking toolchain with 5 elements. [2018-06-25 01:11:11,440 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-25 01:11:11,440 INFO ]: Initializing ChcToBoogie... [2018-06-25 01:11:11,440 INFO ]: ChcToBoogie initialized [2018-06-25 01:11:11,444 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,508 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11 Unit [2018-06-25 01:11:11,508 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-25 01:11:11,509 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-25 01:11:11,509 INFO ]: Initializing Boogie Preprocessor... [2018-06-25 01:11:11,509 INFO ]: Boogie Preprocessor initialized [2018-06-25 01:11:11,532 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,532 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,540 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,540 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,546 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,548 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,549 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,551 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-25 01:11:11,552 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-25 01:11:11,552 INFO ]: Initializing RCFGBuilder... [2018-06-25 01:11:11,552 INFO ]: RCFGBuilder initialized [2018-06-25 01:11:11,553 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (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) [2018-06-25 01:11:11,579 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-25 01:11:11,579 INFO ]: Found specification of procedure gotoProc [2018-06-25 01:11:11,580 INFO ]: Found implementation of procedure gotoProc [2018-06-25 01:11:11,580 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-25 01:11:11,580 INFO ]: Found specification of procedure Ultimate.START [2018-06-25 01:11:11,580 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 [2018-06-25 01:11:11,819 INFO ]: Using library mode [2018-06-25 01:11:11,819 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:11:11 BoogieIcfgContainer [2018-06-25 01:11:11,819 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-25 01:11:11,820 INFO ]: ------------------------BlockEncodingV2---------------------------- [2018-06-25 01:11:11,820 INFO ]: Initializing BlockEncodingV2... [2018-06-25 01:11:11,821 INFO ]: BlockEncodingV2 initialized [2018-06-25 01:11:11,821 INFO ]: Executing the observer BlockEncodingObserver from plugin BlockEncodingV2 for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:11:11" (1/1) ... [2018-06-25 01:11:11,839 INFO ]: Initial Icfg 10 locations, 10 edges [2018-06-25 01:11:11,841 INFO ]: Using Remove infeasible edges [2018-06-25 01:11:11,842 INFO ]: Using Maximize final states [2018-06-25 01:11:11,842 INFO ]: Using Minimize states even if more edges are added than removed.=false [2018-06-25 01:11:11,842 INFO ]: Using Minimize states using LBE with the strategy=MULTI [2018-06-25 01:11:11,844 INFO ]: Using Remove sink states [2018-06-25 01:11:11,845 INFO ]: Using Apply optimizations until nothing changes=true [2018-06-25 01:11:11,845 INFO ]: Using Use SBE [2018-06-25 01:11:11,853 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:11,887 WARN ]: aborting because of expected exponential blowup for input size 40 [2018-06-25 01:11:11,897 WARN ]: aborting because of expected exponential blowup for input size 40 [2018-06-25 01:11:11,898 INFO ]: SBE split 1 edges [2018-06-25 01:11:11,905 INFO ]: Removed 2 edges and 2 locations because of local infeasibility [2018-06-25 01:11:11,908 INFO ]: 0 new accepting states [2018-06-25 01:11:11,995 INFO ]: Removed 6 edges and 2 locations by large block encoding [2018-06-25 01:11:11,999 INFO ]: Removed 0 edges and 0 locations by removing sink states [2018-06-25 01:11:12,000 INFO ]: Removed 0 edges and 0 locations because of local infeasibility [2018-06-25 01:11:12,001 INFO ]: 0 new accepting states [2018-06-25 01:11:12,001 INFO ]: Removed 0 edges and 0 locations by large block encoding [2018-06-25 01:11:12,001 INFO ]: Removed 0 edges and 0 locations by removing sink states [2018-06-25 01:11:12,001 INFO ]: Encoded RCFG 6 locations, 8 edges [2018-06-25 01:11:12,001 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.blockencoding CFG 25.06 01:11:12 BasicIcfg [2018-06-25 01:11:12,001 INFO ]: ------------------------ END BlockEncodingV2---------------------------- [2018-06-25 01:11:12,002 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-25 01:11:12,002 INFO ]: Initializing TraceAbstraction... [2018-06-25 01:11:12,005 INFO ]: TraceAbstraction initialized [2018-06-25 01:11:12,005 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:11:11" (1/4) ... [2018-06-25 01:11:12,006 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b95fa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 25.06 01:11:12, skipping insertion in model container [2018-06-25 01:11:12,006 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:11:11" (2/4) ... [2018-06-25 01:11:12,006 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b95fa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.06 01:11:12, skipping insertion in model container [2018-06-25 01:11:12,006 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:11:11" (3/4) ... [2018-06-25 01:11:12,012 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b95fa1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.06 01:11:12, skipping insertion in model container [2018-06-25 01:11:12,012 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.blockencoding CFG 25.06 01:11:12" (4/4) ... [2018-06-25 01:11:12,014 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver_BEv2 [2018-06-25 01:11:12,022 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-25 01:11:12,031 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-25 01:11:12,073 INFO ]: Using default assertion order modulation [2018-06-25 01:11:12,077 INFO ]: Interprodecural is true [2018-06-25 01:11:12,077 INFO ]: Hoare is false [2018-06-25 01:11:12,077 INFO ]: Compute interpolants for FPandBP [2018-06-25 01:11:12,077 INFO ]: Backedges is TWOTRACK [2018-06-25 01:11:12,077 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-25 01:11:12,077 INFO ]: Difference is false [2018-06-25 01:11:12,077 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-25 01:11:12,077 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-25 01:11:12,085 INFO ]: Start isEmpty. Operand 6 states. [2018-06-25 01:11:12,094 INFO ]: Finished isEmpty. Found accepting run of length 6 [2018-06-25 01:11:12,094 INFO ]: Found error trace [2018-06-25 01:11:12,095 INFO ]: trace histogram [1, 1, 1, 1, 1] [2018-06-25 01:11:12,095 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:11:12,100 INFO ]: Analyzing trace with hash 35496740, now seen corresponding path program 1 times [2018-06-25 01:11:12,102 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:11:12,102 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:11:12,140 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:12,140 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:11:12,140 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:12,175 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:12,245 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:11:12,246 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-25 01:11:12,246 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-25 01:11:12,248 INFO ]: Interpolant automaton has 3 states [2018-06-25 01:11:12,258 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-25 01:11:12,258 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 01:11:12,261 INFO ]: Start difference. First operand 6 states. Second operand 3 states. [2018-06-25 01:11:12,358 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:11:12,358 INFO ]: Finished difference Result 7 states and 9 transitions. [2018-06-25 01:11:12,367 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-25 01:11:12,369 INFO ]: Start accepts. Automaton has 3 states. Word has length 5 [2018-06-25 01:11:12,369 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:11:12,376 INFO ]: With dead ends: 7 [2018-06-25 01:11:12,376 INFO ]: Without dead ends: 7 [2018-06-25 01:11:12,378 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 [2018-06-25 01:11:12,396 INFO ]: Start minimizeSevpa. Operand 7 states. [2018-06-25 01:11:12,428 INFO ]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-06-25 01:11:12,433 INFO ]: Start removeUnreachable. Operand 7 states. [2018-06-25 01:11:12,433 INFO ]: Finished removeUnreachable. Reduced from 7 states to 7 states and 9 transitions. [2018-06-25 01:11:12,434 INFO ]: Start accepts. Automaton has 7 states and 9 transitions. Word has length 5 [2018-06-25 01:11:12,435 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:11:12,436 INFO ]: Abstraction has 7 states and 9 transitions. [2018-06-25 01:11:12,436 INFO ]: Interpolant automaton has 3 states. [2018-06-25 01:11:12,436 INFO ]: Start isEmpty. Operand 7 states and 9 transitions. [2018-06-25 01:11:12,436 INFO ]: Finished isEmpty. Found accepting run of length 7 [2018-06-25 01:11:12,436 INFO ]: Found error trace [2018-06-25 01:11:12,436 INFO ]: trace histogram [1, 1, 1, 1, 1, 1] [2018-06-25 01:11:12,437 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:11:12,437 INFO ]: Analyzing trace with hash 1099958961, now seen corresponding path program 1 times [2018-06-25 01:11:12,437 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:11:12,437 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:11:12,438 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:12,438 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:11:12,438 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:12,503 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:12,781 WARN ]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2018-06-25 01:11:12,782 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:11:12,782 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:11:12,782 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 [2018-06-25 01:11:12,793 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:11:12,843 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:12,856 INFO ]: Computing forward predicates... [2018-06-25 01:11:13,111 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:11:13,144 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:11:13,144 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-06-25 01:11:13,144 INFO ]: Interpolant automaton has 4 states [2018-06-25 01:11:13,144 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-25 01:11:13,144 INFO ]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-25 01:11:13,144 INFO ]: Start difference. First operand 7 states and 9 transitions. Second operand 4 states. [2018-06-25 01:11:13,243 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:11:13,243 INFO ]: Finished difference Result 8 states and 10 transitions. [2018-06-25 01:11:13,243 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-25 01:11:13,243 INFO ]: Start accepts. Automaton has 4 states. Word has length 6 [2018-06-25 01:11:13,244 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:11:13,244 INFO ]: With dead ends: 8 [2018-06-25 01:11:13,244 INFO ]: Without dead ends: 8 [2018-06-25 01:11:13,244 INFO ]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-06-25 01:11:13,244 INFO ]: Start minimizeSevpa. Operand 8 states. [2018-06-25 01:11:13,245 INFO ]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-06-25 01:11:13,245 INFO ]: Start removeUnreachable. Operand 8 states. [2018-06-25 01:11:13,246 INFO ]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2018-06-25 01:11:13,246 INFO ]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 6 [2018-06-25 01:11:13,246 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:11:13,246 INFO ]: Abstraction has 8 states and 10 transitions. [2018-06-25 01:11:13,246 INFO ]: Interpolant automaton has 4 states. [2018-06-25 01:11:13,246 INFO ]: Start isEmpty. Operand 8 states and 10 transitions. [2018-06-25 01:11:13,246 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 01:11:13,246 INFO ]: Found error trace [2018-06-25 01:11:13,246 INFO ]: trace histogram [2, 1, 1, 1, 1, 1] [2018-06-25 01:11:13,246 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:11:13,246 INFO ]: Analyzing trace with hash -261450556, now seen corresponding path program 2 times [2018-06-25 01:11:13,246 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:11:13,246 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:11:13,247 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:13,247 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 01:11:13,247 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:13,298 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:13,907 WARN ]: Spent 428.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 7 [2018-06-25 01:11:14,014 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:11:14,014 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:11:14,014 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 [2018-06-25 01:11:14,022 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-25 01:11:14,108 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 01:11:14,109 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:14,113 INFO ]: Computing forward predicates... [2018-06-25 01:11:14,931 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:11:14,952 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:11:14,952 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 01:11:14,952 INFO ]: Interpolant automaton has 6 states [2018-06-25 01:11:14,952 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 01:11:14,952 INFO ]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-06-25 01:11:14,952 INFO ]: Start difference. First operand 8 states and 10 transitions. Second operand 6 states. [2018-06-25 01:11:15,176 WARN ]: Spent 157.00 ms on a formula simplification. DAG size of input: 10 DAG size of output: 10 [2018-06-25 01:11:15,186 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:11:15,186 INFO ]: Finished difference Result 10 states and 12 transitions. [2018-06-25 01:11:15,186 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-25 01:11:15,186 INFO ]: Start accepts. Automaton has 6 states. Word has length 7 [2018-06-25 01:11:15,186 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:11:15,187 INFO ]: With dead ends: 10 [2018-06-25 01:11:15,187 INFO ]: Without dead ends: 10 [2018-06-25 01:11:15,187 INFO ]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=26, Invalid=30, Unknown=0, NotChecked=0, Total=56 [2018-06-25 01:11:15,187 INFO ]: Start minimizeSevpa. Operand 10 states. [2018-06-25 01:11:15,188 INFO ]: Finished minimizeSevpa. Reduced states from 10 to 9. [2018-06-25 01:11:15,188 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 01:11:15,188 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2018-06-25 01:11:15,188 INFO ]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2018-06-25 01:11:15,188 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:11:15,188 INFO ]: Abstraction has 9 states and 11 transitions. [2018-06-25 01:11:15,188 INFO ]: Interpolant automaton has 6 states. [2018-06-25 01:11:15,188 INFO ]: Start isEmpty. Operand 9 states and 11 transitions. [2018-06-25 01:11:15,188 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-25 01:11:15,188 INFO ]: Found error trace [2018-06-25 01:11:15,188 INFO ]: trace histogram [3, 1, 1, 1, 1, 1] [2018-06-25 01:11:15,188 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:11:15,189 INFO ]: Analyzing trace with hash 484527377, now seen corresponding path program 3 times [2018-06-25 01:11:15,189 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:11:15,189 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:11:15,189 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:15,189 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 01:11:15,189 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:15,238 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:15,484 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:11:15,484 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:11:15,484 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 [2018-06-25 01:11:15,490 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-25 01:11:15,564 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-25 01:11:15,564 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:15,569 INFO ]: Computing forward predicates... [2018-06-25 01:11:16,188 WARN ]: Spent 313.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 5 [2018-06-25 01:11:21,831 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:11:21,864 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 01:11:21,864 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2018-06-25 01:11:21,864 INFO ]: Interpolant automaton has 8 states [2018-06-25 01:11:21,865 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-25 01:11:21,865 INFO ]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2018-06-25 01:11:21,865 INFO ]: Start difference. First operand 9 states and 11 transitions. Second operand 8 states. [2018-06-25 01:11:22,071 WARN ]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 6 [2018-06-25 01:11:22,168 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 01:11:22,168 INFO ]: Finished difference Result 12 states and 14 transitions. [2018-06-25 01:11:22,168 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-25 01:11:22,168 INFO ]: Start accepts. Automaton has 8 states. Word has length 8 [2018-06-25 01:11:22,168 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 01:11:22,169 INFO ]: With dead ends: 12 [2018-06-25 01:11:22,169 INFO ]: Without dead ends: 12 [2018-06-25 01:11:22,169 INFO ]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=74, Unknown=0, NotChecked=0, Total=132 [2018-06-25 01:11:22,169 INFO ]: Start minimizeSevpa. Operand 12 states. [2018-06-25 01:11:22,170 INFO ]: Finished minimizeSevpa. Reduced states from 12 to 10. [2018-06-25 01:11:22,170 INFO ]: Start removeUnreachable. Operand 10 states. [2018-06-25 01:11:22,170 INFO ]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2018-06-25 01:11:22,170 INFO ]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 8 [2018-06-25 01:11:22,170 INFO ]: Finished accepts. word is rejected. [2018-06-25 01:11:22,170 INFO ]: Abstraction has 10 states and 12 transitions. [2018-06-25 01:11:22,170 INFO ]: Interpolant automaton has 8 states. [2018-06-25 01:11:22,171 INFO ]: Start isEmpty. Operand 10 states and 12 transitions. [2018-06-25 01:11:22,171 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-25 01:11:22,171 INFO ]: Found error trace [2018-06-25 01:11:22,171 INFO ]: trace histogram [4, 1, 1, 1, 1, 1] [2018-06-25 01:11:22,171 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 01:11:22,171 INFO ]: Analyzing trace with hash 2135006820, now seen corresponding path program 4 times [2018-06-25 01:11:22,171 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 01:11:22,171 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 01:11:22,172 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:22,172 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 01:11:22,172 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 01:11:22,233 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:22,703 INFO ]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 01:11:22,703 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 01:11:22,703 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 [2018-06-25 01:11:22,715 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-25 01:11:22,766 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-25 01:11:22,766 INFO ]: Conjunction of SSA is unsat [2018-06-25 01:11:22,772 INFO ]: Computing forward predicates... [2018-06-25 01:11:40,768 WARN ]: expecting exponential blowup for input size 13 [2018-06-25 01:11:40,874 WARN ]: Simplifying disjunction of 6416 conjuctions. This might take some time... [2018-06-25 01:11:41,581 INFO ]: Simplified to disjunction of 624 conjuctions. [2018-06-25 01:11:41,586 WARN ]: expecting exponential blowup for input size 8 [2018-06-25 01:11:41,605 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:41,629 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:41,654 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:41,657 WARN ]: expecting exponential blowup for input size 11 [2018-06-25 01:11:41,746 WARN ]: Simplifying disjunction of 9456 conjuctions. This might take some time... [2018-06-25 01:11:42,999 INFO ]: Simplified to disjunction of 992 conjuctions. [2018-06-25 01:11:43,008 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:43,014 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:43,042 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:43,079 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:43,090 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:43,095 WARN ]: expecting exponential blowup for input size 10 [2018-06-25 01:11:43,340 WARN ]: expecting exponential blowup for input size 10 [2018-06-25 01:11:43,606 WARN ]: expecting exponential blowup for input size 9 [2018-06-25 01:11:43,631 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:43,646 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:43,650 WARN ]: expecting exponential blowup for input size 8 [2018-06-25 01:11:43,673 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:43,675 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:43,680 WARN ]: expecting exponential blowup for input size 9 [2018-06-25 01:11:43,705 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:43,707 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:43,757 WARN ]: expecting exponential blowup for input size 9 [2018-06-25 01:11:43,810 WARN ]: expecting exponential blowup for input size 8 [2018-06-25 01:11:43,833 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:43,845 WARN ]: expecting exponential blowup for input size 10 [2018-06-25 01:11:44,010 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:44,014 WARN ]: expecting exponential blowup for input size 11 [2018-06-25 01:11:44,060 WARN ]: Simplifying disjunction of 9520 conjuctions. This might take some time... [2018-06-25 01:11:45,149 INFO ]: Simplified to disjunction of 992 conjuctions. [2018-06-25 01:11:45,165 WARN ]: expecting exponential blowup for input size 9 [2018-06-25 01:11:45,225 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:45,228 WARN ]: expecting exponential blowup for input size 8 [2018-06-25 01:11:45,420 WARN ]: expecting exponential blowup for input size 8 [2018-06-25 01:11:45,454 WARN ]: expecting exponential blowup for input size 10 [2018-06-25 01:11:45,722 WARN ]: expecting exponential blowup for input size 10 [2018-06-25 01:11:45,955 WARN ]: expecting exponential blowup for input size 9 [2018-06-25 01:11:46,008 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:46,018 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:46,020 WARN ]: expecting exponential blowup for input size 7 [2018-06-25 01:11:46,026 WARN ]: expecting exponential blowup for input size 11 [2018-06-25 01:11:46,064 WARN ]: Simplifying disjunction of 8400 conjuctions. This might take some time... [2018-06-25 01:11:46,743 INFO ]: Simplified to disjunction of 992 conjuctions. [2018-06-25 01:11:46,747 WARN ]: expecting exponential blowup for input size 10 [2018-06-25 01:11:46,871 WARN ]: expecting exponential blowup for input size 6 [2018-06-25 01:11:46,877 WARN ]: expecting exponential blowup for input size 8 [2018-06-25 01:11:46,889 WARN ]: expecting exponential blowup for input size 9 [2018-06-25 01:11:46,907 WARN ]: expecting exponential blowup for input size 6 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown