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/cav12/toy-bug-2.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8d74a04 [2018-06-22 14:36:06,256 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-22 14:36:06,260 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-22 14:36:06,272 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-22 14:36:06,273 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-22 14:36:06,274 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-22 14:36:06,275 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-22 14:36:06,277 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-22 14:36:06,278 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-22 14:36:06,279 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-22 14:36:06,280 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-22 14:36:06,280 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-22 14:36:06,281 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-22 14:36:06,284 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-22 14:36:06,285 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-22 14:36:06,286 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-22 14:36:06,288 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-22 14:36:06,292 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-22 14:36:06,294 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-22 14:36:06,295 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-22 14:36:06,296 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-22 14:36:06,299 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-22 14:36:06,299 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-22 14:36:06,299 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-22 14:36:06,300 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-22 14:36:06,301 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-22 14:36:06,302 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-22 14:36:06,302 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-22 14:36:06,304 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-22 14:36:06,304 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-22 14:36:06,304 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-22 14:36:06,305 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-22 14:36:06,305 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-22 14:36:06,306 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-22 14:36:06,307 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-22 14:36:06,307 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 14:36:06,321 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-22 14:36:06,321 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-22 14:36:06,321 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-22 14:36:06,322 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-22 14:36:06,323 INFO L131 SettingsManager]: Preferences of ChcToBoogie differ from their defaults: [2018-06-22 14:36:06,323 INFO L133 SettingsManager]: * Use one large procedure with gotos to replace tail recursive calls=false [2018-06-22 14:36:06,323 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-22 14:36:06,323 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-22 14:36:06,324 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-22 14:36:06,324 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-22 14:36:06,324 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 14:36:06,324 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-22 14:36:06,324 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-22 14:36:06,325 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-22 14:36:06,325 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-22 14:36:06,325 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-22 14:36:06,325 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-22 14:36:06,325 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-22 14:36:06,326 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-22 14:36:06,327 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-22 14:36:06,327 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-22 14:36:06,379 INFO ]: Repository-Root is: /tmp [2018-06-22 14:36:06,397 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-22 14:36:06,405 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-22 14:36:06,407 INFO ]: Initializing SmtParser... [2018-06-22 14:36:06,407 INFO ]: SmtParser initialized [2018-06-22 14:36:06,408 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/cav12/toy-bug-2.smt2 [2018-06-22 14:36:06,409 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 14:36:06,515 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/cav12/toy-bug-2.smt2 unknown [2018-06-22 14:36:07,127 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/cav12/toy-bug-2.smt2 [2018-06-22 14:36:07,132 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-22 14:36:07,138 INFO ]: Walking toolchain with 4 elements. [2018-06-22 14:36:07,139 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-22 14:36:07,139 INFO ]: Initializing ChcToBoogie... [2018-06-22 14:36:07,140 INFO ]: ChcToBoogie initialized [2018-06-22 14:36:07,143 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 02:36:07" (1/1) ... [2018-06-22 14:36:07,202 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07 Unit [2018-06-22 14:36:07,203 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-22 14:36:07,203 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-22 14:36:07,203 INFO ]: Initializing Boogie Preprocessor... [2018-06-22 14:36:07,203 INFO ]: Boogie Preprocessor initialized [2018-06-22 14:36:07,229 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (1/1) ... [2018-06-22 14:36:07,229 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (1/1) ... [2018-06-22 14:36:07,247 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (1/1) ... [2018-06-22 14:36:07,247 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (1/1) ... [2018-06-22 14:36:07,259 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (1/1) ... [2018-06-22 14:36:07,261 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (1/1) ... [2018-06-22 14:36:07,266 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (1/1) ... [2018-06-22 14:36:07,270 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-22 14:36:07,271 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-22 14:36:07,271 INFO ]: Initializing RCFGBuilder... [2018-06-22 14:36:07,271 INFO ]: RCFGBuilder initialized [2018-06-22 14:36:07,272 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (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 14:36:07,284 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-22 14:36:07,284 INFO ]: Found specification of procedure False [2018-06-22 14:36:07,284 INFO ]: Found implementation of procedure False [2018-06-22 14:36:07,284 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-22 14:36:07,284 INFO ]: Found specification of procedure state [2018-06-22 14:36:07,284 INFO ]: Found implementation of procedure state [2018-06-22 14:36:07,284 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-22 14:36:07,284 INFO ]: Found specification of procedure Ultimate.START [2018-06-22 14:36:07,284 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 14:36:07,721 INFO ]: Using library mode [2018-06-22 14:36:07,722 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 02:36:07 BoogieIcfgContainer [2018-06-22 14:36:07,724 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-22 14:36:07,726 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-22 14:36:07,726 INFO ]: Initializing TraceAbstraction... [2018-06-22 14:36:07,733 INFO ]: TraceAbstraction initialized [2018-06-22 14:36:07,734 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 02:36:07" (1/3) ... [2018-06-22 14:36:07,735 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61a827e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 22.06 02:36:07, skipping insertion in model container [2018-06-22 14:36:07,735 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 02:36:07" (2/3) ... [2018-06-22 14:36:07,735 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61a827e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.06 02:36:07, skipping insertion in model container [2018-06-22 14:36:07,735 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 02:36:07" (3/3) ... [2018-06-22 14:36:07,740 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-22 14:36:07,751 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-22 14:36:07,762 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-22 14:36:07,816 INFO ]: Using default assertion order modulation [2018-06-22 14:36:07,816 INFO ]: Interprodecural is true [2018-06-22 14:36:07,816 INFO ]: Hoare is false [2018-06-22 14:36:07,816 INFO ]: Compute interpolants for FPandBP [2018-06-22 14:36:07,816 INFO ]: Backedges is TWOTRACK [2018-06-22 14:36:07,816 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-22 14:36:07,816 INFO ]: Difference is false [2018-06-22 14:36:07,816 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-22 14:36:07,816 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-22 14:36:07,836 INFO ]: Start isEmpty. Operand 13 states. [2018-06-22 14:36:07,853 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-22 14:36:07,853 INFO ]: Found error trace [2018-06-22 14:36:07,854 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 14:36:07,855 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 14:36:07,862 INFO ]: Analyzing trace with hash -597537630, now seen corresponding path program 1 times [2018-06-22 14:36:07,864 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 14:36:07,865 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 14:36:07,901 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:07,901 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 14:36:07,901 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:07,936 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:08,071 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 14:36:08,074 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-22 14:36:08,074 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-22 14:36:08,076 INFO ]: Interpolant automaton has 4 states [2018-06-22 14:36:08,089 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-22 14:36:08,089 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 14:36:08,091 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-22 14:36:08,238 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 14:36:08,239 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-22 14:36:08,239 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-22 14:36:08,241 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-22 14:36:08,241 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 14:36:08,254 INFO ]: With dead ends: 13 [2018-06-22 14:36:08,254 INFO ]: Without dead ends: 13 [2018-06-22 14:36:08,258 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 14:36:08,278 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-22 14:36:08,297 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-22 14:36:08,298 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-22 14:36:08,299 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-22 14:36:08,301 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-22 14:36:08,301 INFO ]: Finished accepts. word is rejected. [2018-06-22 14:36:08,301 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-22 14:36:08,301 INFO ]: Interpolant automaton has 4 states. [2018-06-22 14:36:08,301 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-22 14:36:08,302 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-22 14:36:08,302 INFO ]: Found error trace [2018-06-22 14:36:08,303 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 14:36:08,303 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 14:36:08,303 INFO ]: Analyzing trace with hash 1530833734, now seen corresponding path program 1 times [2018-06-22 14:36:08,303 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 14:36:08,303 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 14:36:08,304 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:08,304 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 14:36:08,304 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:08,465 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:08,856 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 14:36:08,856 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 14:36:08,856 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 14:36:08,865 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 14:36:08,946 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:08,957 INFO ]: Computing forward predicates... [2018-06-22 14:36:10,446 WARN ]: Spent 731.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 15 [2018-06-22 14:36:10,844 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 14:36:10,866 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 14:36:10,866 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2018-06-22 14:36:10,867 INFO ]: Interpolant automaton has 10 states [2018-06-22 14:36:10,867 INFO ]: Constructing interpolant automaton starting with 10 interpolants. [2018-06-22 14:36:10,867 INFO ]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2018-06-22 14:36:10,868 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 10 states. [2018-06-22 14:36:11,091 WARN ]: Spent 103.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 16 [2018-06-22 14:36:11,151 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 14:36:11,151 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-22 14:36:11,152 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-22 14:36:11,152 INFO ]: Start accepts. Automaton has 10 states. Word has length 13 [2018-06-22 14:36:11,152 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 14:36:11,152 INFO ]: With dead ends: 15 [2018-06-22 14:36:11,152 INFO ]: Without dead ends: 15 [2018-06-22 14:36:11,153 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-06-22 14:36:11,153 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-22 14:36:11,156 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-22 14:36:11,156 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-22 14:36:11,157 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-22 14:36:11,157 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-22 14:36:11,157 INFO ]: Finished accepts. word is rejected. [2018-06-22 14:36:11,157 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-22 14:36:11,157 INFO ]: Interpolant automaton has 10 states. [2018-06-22 14:36:11,157 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-22 14:36:11,158 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-22 14:36:11,158 INFO ]: Found error trace [2018-06-22 14:36:11,158 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 14:36:11,158 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 14:36:11,158 INFO ]: Analyzing trace with hash -1486246934, now seen corresponding path program 2 times [2018-06-22 14:36:11,158 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 14:36:11,158 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 14:36:11,159 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:11,159 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 14:36:11,159 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:11,237 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:11,545 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 14:36:11,545 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 14:36:11,546 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 14:36:11,554 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-22 14:36:11,623 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-22 14:36:11,623 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:11,631 INFO ]: Computing forward predicates... [2018-06-22 14:36:12,728 WARN ]: Spent 380.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 25 [2018-06-22 14:36:12,828 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 14:36:12,855 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 14:36:12,856 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2018-06-22 14:36:12,856 INFO ]: Interpolant automaton has 13 states [2018-06-22 14:36:12,856 INFO ]: Constructing interpolant automaton starting with 13 interpolants. [2018-06-22 14:36:12,856 INFO ]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2018-06-22 14:36:12,856 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 13 states. [2018-06-22 14:36:13,044 WARN ]: Spent 157.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 30 [2018-06-22 14:36:13,362 WARN ]: Spent 179.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 29 [2018-06-22 14:36:13,438 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 14:36:13,438 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-22 14:36:13,438 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-22 14:36:13,439 INFO ]: Start accepts. Automaton has 13 states. Word has length 17 [2018-06-22 14:36:13,439 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 14:36:13,439 INFO ]: With dead ends: 17 [2018-06-22 14:36:13,439 INFO ]: Without dead ends: 17 [2018-06-22 14:36:13,439 INFO ]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2018-06-22 14:36:13,439 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-22 14:36:13,443 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-22 14:36:13,443 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-22 14:36:13,444 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-22 14:36:13,444 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-22 14:36:13,444 INFO ]: Finished accepts. word is rejected. [2018-06-22 14:36:13,444 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-22 14:36:13,444 INFO ]: Interpolant automaton has 13 states. [2018-06-22 14:36:13,444 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-22 14:36:13,445 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-22 14:36:13,445 INFO ]: Found error trace [2018-06-22 14:36:13,445 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 14:36:13,445 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 14:36:13,445 INFO ]: Analyzing trace with hash -2056434034, now seen corresponding path program 3 times [2018-06-22 14:36:13,445 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 14:36:13,445 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 14:36:13,446 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:13,446 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 14:36:13,446 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:13,533 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:13,969 WARN ]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2018-06-22 14:36:14,167 WARN ]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-06-22 14:36:14,511 WARN ]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-06-22 14:36:14,759 WARN ]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-06-22 14:36:14,851 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-22 14:36:14,851 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 14:36:14,851 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 14:36:14,868 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-22 14:36:14,986 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-22 14:36:14,986 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:14,998 INFO ]: Computing forward predicates... [2018-06-22 14:36:16,941 WARN ]: Spent 568.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 32 [2018-06-22 14:36:17,060 INFO ]: Checked inductivity of 21 backedges. 2 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-22 14:36:17,103 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 14:36:17,103 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2018-06-22 14:36:17,104 INFO ]: Interpolant automaton has 16 states [2018-06-22 14:36:17,104 INFO ]: Constructing interpolant automaton starting with 16 interpolants. [2018-06-22 14:36:17,104 INFO ]: CoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2018-06-22 14:36:17,104 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 16 states. [2018-06-22 14:36:17,435 WARN ]: Spent 300.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 38 [2018-06-22 14:36:17,871 WARN ]: Spent 305.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 35 [2018-06-22 14:36:18,123 WARN ]: Spent 232.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 37 [2018-06-22 14:36:18,160 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 14:36:18,160 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-22 14:36:18,161 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-22 14:36:18,161 INFO ]: Start accepts. Automaton has 16 states. Word has length 21 [2018-06-22 14:36:18,161 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 14:36:18,162 INFO ]: With dead ends: 19 [2018-06-22 14:36:18,162 INFO ]: Without dead ends: 19 [2018-06-22 14:36:18,162 INFO ]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=110, Invalid=310, Unknown=0, NotChecked=0, Total=420 [2018-06-22 14:36:18,162 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-22 14:36:18,165 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-22 14:36:18,165 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-22 14:36:18,166 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-22 14:36:18,166 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-22 14:36:18,166 INFO ]: Finished accepts. word is rejected. [2018-06-22 14:36:18,166 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-22 14:36:18,166 INFO ]: Interpolant automaton has 16 states. [2018-06-22 14:36:18,166 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-22 14:36:18,167 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-22 14:36:18,167 INFO ]: Found error trace [2018-06-22 14:36:18,167 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 14:36:18,167 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 14:36:18,167 INFO ]: Analyzing trace with hash -434924750, now seen corresponding path program 4 times [2018-06-22 14:36:18,167 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 14:36:18,167 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 14:36:18,168 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:18,168 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 14:36:18,168 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 14:36:18,288 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:18,633 INFO ]: Checked inductivity of 36 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-22 14:36:18,633 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 14:36:18,633 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 14:36:18,640 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-22 14:36:22,986 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-22 14:36:22,986 INFO ]: Conjunction of SSA is unsat [2018-06-22 14:36:22,999 INFO ]: Computing forward predicates... [2018-06-22 14:36:24,029 WARN ]: Spent 419.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 Received shutdown request... [2018-06-22 14:37:17,139 INFO ]: Timeout while computing interpolants [2018-06-22 14:37:17,339 WARN ]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 14:37:17,339 WARN ]: Verification canceled [2018-06-22 14:37:17,357 WARN ]: Timeout [2018-06-22 14:37:17,357 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.06 02:37:17 BoogieIcfgContainer [2018-06-22 14:37:17,357 INFO ]: ------------------------ END TraceAbstraction---------------------------- [2018-06-22 14:37:17,358 INFO ]: Toolchain (without parser) took 70225.49 ms. Allocated memory was 308.8 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 241.3 MB in the beginning and 1.2 GB in the end (delta: -967.4 MB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. [2018-06-22 14:37:17,363 INFO ]: SmtParser took 0.09 ms. Allocated memory is still 308.8 MB. Free memory is still 273.3 MB. There was no memory consumed. Max. memory is 3.6 GB. [2018-06-22 14:37:17,363 INFO ]: ChcToBoogie took 63.60 ms. Allocated memory is still 308.8 MB. Free memory was 241.3 MB in the beginning and 239.3 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. [2018-06-22 14:37:17,363 INFO ]: Boogie Preprocessor took 67.06 ms. Allocated memory is still 308.8 MB. Free memory was 239.3 MB in the beginning and 237.3 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. [2018-06-22 14:37:17,364 INFO ]: RCFGBuilder took 453.24 ms. Allocated memory is still 308.8 MB. Free memory was 237.3 MB in the beginning and 213.2 MB in the end (delta: 24.1 MB). Peak memory consumption was 24.1 MB. Max. memory is 3.6 GB. [2018-06-22 14:37:17,364 INFO ]: TraceAbstraction took 69631.07 ms. Allocated memory was 308.8 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 213.2 MB in the beginning and 1.2 GB in the end (delta: -995.4 MB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. [2018-06-22 14:37:17,379 INFO ]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * SmtParser took 0.09 ms. Allocated memory is still 308.8 MB. Free memory is still 273.3 MB. There was no memory consumed. Max. memory is 3.6 GB. * ChcToBoogie took 63.60 ms. Allocated memory is still 308.8 MB. Free memory was 241.3 MB in the beginning and 239.3 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. * Boogie Preprocessor took 67.06 ms. Allocated memory is still 308.8 MB. Free memory was 239.3 MB in the beginning and 237.3 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 3.6 GB. * RCFGBuilder took 453.24 ms. Allocated memory is still 308.8 MB. Free memory was 237.3 MB in the beginning and 213.2 MB in the end (delta: 24.1 MB). Peak memory consumption was 24.1 MB. Max. memory is 3.6 GB. * TraceAbstraction took 69631.07 ms. Allocated memory was 308.8 MB in the beginning and 1.5 GB in the end (delta: 1.2 GB). Free memory was 213.2 MB in the beginning and 1.2 GB in the end (delta: -995.4 MB). Peak memory consumption was 1.3 GB. Max. memory is 3.6 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [UNKNOWN] : Timeout (TraceAbstraction) Unable to prove that assertion always holds (line 0). Cancelled while BasicCegarLoop was analyzing trace of length 26 with TraceHistMax 5, while TraceCheckSpWp was constructing forward predicates, while PartialQuantifierElimination was eliminating quantifiers from formula with 0 quantifier alternations, while DnfTransformerHelper was XNF transformer was simplifying 4400 conjuctions. . - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 13 locations, 1 error locations. TIMEOUT Result, 69.5s OverallTime, 5 OverallIterations, 5 TraceHistogramMax, 2.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 44 SDtfs, 48 SDslu, 127 SDs, 0 SdLazy, 88 SolverSat, 61 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 88 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 5.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=19occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 7.3s InterpolantComputationTime, 111 NumberOfCodeBlocks, 111 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 104 ConstructedInterpolants, 0 QuantifiedInterpolants, 13476 SizeOfPredicates, 498 NumberOfNonLiveVariables, 645 ConjunctsInSsa, 54 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 22/68 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/toy-bug-2.smt2_AutomizerCHC_No_Goto.epf_AutomizerCHC.xml/Csv-Benchmark-0-2018-06-22_14-37-17-407.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/toy-bug-2.smt2_AutomizerCHC_No_Goto.epf_AutomizerCHC.xml/Csv-TraceAbstractionBenchmarks-0-2018-06-22_14-37-17-407.csv Completed graceful shutdown