java -Xmx8000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --generate-csv --csv-dir csv -s ../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf -i ../../../trunk/examples/svcomp/loops/sum03_false-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-dd2f093 [2018-07-24 10:43:56,478 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-07-24 10:43:56,481 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-07-24 10:43:56,495 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-07-24 10:43:56,495 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-07-24 10:43:56,496 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-07-24 10:43:56,498 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-07-24 10:43:56,500 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-07-24 10:43:56,502 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-07-24 10:43:56,503 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-07-24 10:43:56,504 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-07-24 10:43:56,505 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-07-24 10:43:56,506 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-07-24 10:43:56,508 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-07-24 10:43:56,509 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-07-24 10:43:56,510 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-07-24 10:43:56,517 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-07-24 10:43:56,521 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-07-24 10:43:56,524 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-07-24 10:43:56,528 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-07-24 10:43:56,530 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-07-24 10:43:56,531 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-07-24 10:43:56,534 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-07-24 10:43:56,534 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-07-24 10:43:56,534 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-07-24 10:43:56,536 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-07-24 10:43:56,536 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-07-24 10:43:56,537 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-07-24 10:43:56,538 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-07-24 10:43:56,539 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-07-24 10:43:56,539 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-07-24 10:43:56,540 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-07-24 10:43:56,542 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-07-24 10:43:56,542 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-07-24 10:43:56,544 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-07-24 10:43:56,545 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-07-24 10:43:56,545 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf [2018-07-24 10:43:56,562 INFO L110 SettingsManager]: Loading preferences was successful [2018-07-24 10:43:56,562 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-07-24 10:43:56,563 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-07-24 10:43:56,563 INFO L133 SettingsManager]: * User list type=DISABLED [2018-07-24 10:43:56,564 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-07-24 10:43:56,564 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-07-24 10:43:56,564 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-07-24 10:43:56,564 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-07-24 10:43:56,564 INFO L133 SettingsManager]: * Log string format=TERM [2018-07-24 10:43:56,564 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-07-24 10:43:56,565 INFO L133 SettingsManager]: * Interval Domain=false [2018-07-24 10:43:56,565 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-07-24 10:43:56,566 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-07-24 10:43:56,566 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-07-24 10:43:56,566 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-07-24 10:43:56,566 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-07-24 10:43:56,566 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-07-24 10:43:56,566 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-07-24 10:43:56,567 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-07-24 10:43:56,567 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-07-24 10:43:56,567 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-07-24 10:43:56,567 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-07-24 10:43:56,567 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-07-24 10:43:56,568 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-07-24 10:43:56,568 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-07-24 10:43:56,568 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-07-24 10:43:56,568 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-07-24 10:43:56,568 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-07-24 10:43:56,569 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-07-24 10:43:56,569 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-07-24 10:43:56,569 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-07-24 10:43:56,569 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-07-24 10:43:56,569 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-07-24 10:43:56,614 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-07-24 10:43:56,627 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-07-24 10:43:56,634 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-07-24 10:43:56,636 INFO L271 PluginConnector]: Initializing CDTParser... [2018-07-24 10:43:56,636 INFO L276 PluginConnector]: CDTParser initialized [2018-07-24 10:43:56,637 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum03_false-unreach-call_true-termination.i [2018-07-24 10:43:57,028 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2278c4545/4939a9b0c52646e486e711524bf32064/FLAG193c25d84 [2018-07-24 10:43:57,191 INFO L276 CDTParser]: Found 1 translation units. [2018-07-24 10:43:57,192 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum03_false-unreach-call_true-termination.i [2018-07-24 10:43:57,199 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2278c4545/4939a9b0c52646e486e711524bf32064/FLAG193c25d84 [2018-07-24 10:43:57,219 INFO L332 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2278c4545/4939a9b0c52646e486e711524bf32064 [2018-07-24 10:43:57,230 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-07-24 10:43:57,232 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-07-24 10:43:57,233 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-07-24 10:43:57,233 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-07-24 10:43:57,240 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-07-24 10:43:57,241 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,244 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47db165b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57, skipping insertion in model container [2018-07-24 10:43:57,244 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,422 INFO L179 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-07-24 10:43:57,461 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-24 10:43:57,478 INFO L422 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-07-24 10:43:57,483 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-24 10:43:57,496 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57 WrapperNode [2018-07-24 10:43:57,496 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-07-24 10:43:57,497 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-07-24 10:43:57,497 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-07-24 10:43:57,497 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-07-24 10:43:57,507 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,514 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,520 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-07-24 10:43:57,520 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-07-24 10:43:57,521 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-07-24 10:43:57,521 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-07-24 10:43:57,530 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,531 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,531 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,532 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,533 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,539 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,540 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... [2018-07-24 10:43:57,541 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-07-24 10:43:57,541 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-07-24 10:43:57,542 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-07-24 10:43:57,542 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-07-24 10:43:57,543 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 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 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-07-24 10:43:57,612 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-07-24 10:43:57,613 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-07-24 10:43:57,613 INFO L130 BoogieDeclarations]: Found specification of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assert [2018-07-24 10:43:57,613 INFO L138 BoogieDeclarations]: Found implementation of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assert [2018-07-24 10:43:57,614 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-07-24 10:43:57,614 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-07-24 10:43:57,614 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-07-24 10:43:57,614 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-07-24 10:43:57,931 INFO L261 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-07-24 10:43:57,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.07 10:43:57 BoogieIcfgContainer [2018-07-24 10:43:57,932 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-07-24 10:43:57,933 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-07-24 10:43:57,933 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-07-24 10:43:57,936 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-07-24 10:43:57,936 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.07 10:43:57" (1/3) ... [2018-07-24 10:43:57,937 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@527df2dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.07 10:43:57, skipping insertion in model container [2018-07-24 10:43:57,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 10:43:57" (2/3) ... [2018-07-24 10:43:57,938 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@527df2dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.07 10:43:57, skipping insertion in model container [2018-07-24 10:43:57,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.07 10:43:57" (3/3) ... [2018-07-24 10:43:57,940 INFO L112 eAbstractionObserver]: Analyzing ICFG sum03_false-unreach-call_true-termination.i [2018-07-24 10:43:57,949 INFO L132 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-07-24 10:43:57,961 INFO L144 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-07-24 10:43:58,020 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2018-07-24 10:43:58,021 INFO L373 AbstractCegarLoop]: Interprodecural is true [2018-07-24 10:43:58,021 INFO L374 AbstractCegarLoop]: Hoare is true [2018-07-24 10:43:58,021 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-07-24 10:43:58,021 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-07-24 10:43:58,021 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-07-24 10:43:58,022 INFO L378 AbstractCegarLoop]: Difference is false [2018-07-24 10:43:58,022 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-07-24 10:43:58,022 INFO L384 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-07-24 10:43:58,038 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-07-24 10:43:58,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-07-24 10:43:58,044 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 10:43:58,045 INFO L353 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 10:43:58,045 INFO L414 AbstractCegarLoop]: === Iteration 1 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 10:43:58,050 INFO L82 PathProgramCache]: Analyzing trace with hash -445381290, now seen corresponding path program 1 times [2018-07-24 10:43:58,053 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 10:43:58,105 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:43:58,105 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 10:43:58,106 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:43:58,106 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 10:43:58,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:43:58,579 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 10:43:58,581 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-24 10:43:58,582 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-07-24 10:43:58,582 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-24 10:43:58,586 INFO L450 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-07-24 10:43:58,599 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-07-24 10:43:58,600 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-07-24 10:43:58,603 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 6 states. [2018-07-24 10:43:58,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 10:43:58,813 INFO L93 Difference]: Finished difference Result 41 states and 54 transitions. [2018-07-24 10:43:58,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-07-24 10:43:58,815 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2018-07-24 10:43:58,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 10:43:58,828 INFO L225 Difference]: With dead ends: 41 [2018-07-24 10:43:58,829 INFO L226 Difference]: Without dead ends: 26 [2018-07-24 10:43:58,833 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-07-24 10:43:58,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-07-24 10:43:58,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-07-24 10:43:58,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-07-24 10:43:58,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-07-24 10:43:58,873 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 13 [2018-07-24 10:43:58,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 10:43:58,874 INFO L471 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-07-24 10:43:58,874 INFO L472 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-07-24 10:43:58,874 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-07-24 10:43:58,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-07-24 10:43:58,875 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 10:43:58,875 INFO L353 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 10:43:58,875 INFO L414 AbstractCegarLoop]: === Iteration 2 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 10:43:58,875 INFO L82 PathProgramCache]: Analyzing trace with hash -388122988, now seen corresponding path program 1 times [2018-07-24 10:43:58,876 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 10:43:58,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:43:58,877 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 10:43:58,877 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:43:58,877 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 10:43:58,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:43:58,956 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 10:43:58,957 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-24 10:43:58,957 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-07-24 10:43:58,957 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-24 10:43:58,959 INFO L450 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-07-24 10:43:58,959 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-07-24 10:43:58,959 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-07-24 10:43:58,960 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2018-07-24 10:43:59,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 10:43:59,182 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2018-07-24 10:43:59,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-07-24 10:43:59,183 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-07-24 10:43:59,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 10:43:59,186 INFO L225 Difference]: With dead ends: 39 [2018-07-24 10:43:59,186 INFO L226 Difference]: Without dead ends: 37 [2018-07-24 10:43:59,187 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-07-24 10:43:59,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-07-24 10:43:59,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-07-24 10:43:59,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-07-24 10:43:59,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2018-07-24 10:43:59,197 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 13 [2018-07-24 10:43:59,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 10:43:59,197 INFO L471 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2018-07-24 10:43:59,197 INFO L472 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-07-24 10:43:59,198 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2018-07-24 10:43:59,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-07-24 10:43:59,199 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 10:43:59,199 INFO L353 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 10:43:59,199 INFO L414 AbstractCegarLoop]: === Iteration 3 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 10:43:59,199 INFO L82 PathProgramCache]: Analyzing trace with hash 663519350, now seen corresponding path program 1 times [2018-07-24 10:43:59,200 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 10:43:59,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:43:59,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 10:43:59,201 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:43:59,201 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 10:43:59,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:43:59,324 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 10:43:59,324 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:43:59,324 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 10:43:59,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 10:43:59,344 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 10:43:59,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:43:59,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:43:59,412 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 10:43:59,412 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:43:59,482 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 10:43:59,506 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:43:59,506 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 10:43:59,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 10:43:59,523 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 10:43:59,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:43:59,548 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:43:59,582 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 10:43:59,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:43:59,648 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 10:43:59,653 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 10:43:59,653 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-07-24 10:43:59,653 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 10:43:59,654 INFO L450 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-07-24 10:43:59,655 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-07-24 10:43:59,655 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-07-24 10:43:59,656 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 4 states. [2018-07-24 10:43:59,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 10:43:59,716 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2018-07-24 10:43:59,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-07-24 10:43:59,716 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2018-07-24 10:43:59,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 10:43:59,718 INFO L225 Difference]: With dead ends: 54 [2018-07-24 10:43:59,718 INFO L226 Difference]: Without dead ends: 34 [2018-07-24 10:43:59,720 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 84 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-07-24 10:43:59,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-07-24 10:43:59,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-07-24 10:43:59,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-07-24 10:43:59,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2018-07-24 10:43:59,731 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 22 [2018-07-24 10:43:59,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 10:43:59,733 INFO L471 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2018-07-24 10:43:59,733 INFO L472 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-07-24 10:43:59,733 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2018-07-24 10:43:59,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-07-24 10:43:59,735 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 10:43:59,736 INFO L353 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 10:43:59,736 INFO L414 AbstractCegarLoop]: === Iteration 4 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 10:43:59,736 INFO L82 PathProgramCache]: Analyzing trace with hash -549079852, now seen corresponding path program 2 times [2018-07-24 10:43:59,736 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 10:43:59,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:43:59,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 10:43:59,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:43:59,738 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 10:43:59,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:43:59,951 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-07-24 10:43:59,951 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:43:59,951 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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 [2018-07-24 10:43:59,960 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-24 10:43:59,961 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-24 10:43:59,976 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-24 10:43:59,977 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:43:59,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:00,003 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-07-24 10:44:00,004 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:44:00,148 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-07-24 10:44:00,168 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:44:00,169 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 10:44:00,185 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-24 10:44:00,185 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-24 10:44:00,217 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-24 10:44:00,217 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:44:00,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:00,246 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-07-24 10:44:00,246 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:44:00,302 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-07-24 10:44:00,305 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 10:44:00,305 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-07-24 10:44:00,306 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 10:44:00,307 INFO L450 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-07-24 10:44:00,309 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-07-24 10:44:00,309 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-07-24 10:44:00,310 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 5 states. [2018-07-24 10:44:00,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 10:44:00,402 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2018-07-24 10:44:00,403 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-07-24 10:44:00,403 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-07-24 10:44:00,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 10:44:00,404 INFO L225 Difference]: With dead ends: 50 [2018-07-24 10:44:00,404 INFO L226 Difference]: Without dead ends: 39 [2018-07-24 10:44:00,405 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-07-24 10:44:00,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-07-24 10:44:00,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-07-24 10:44:00,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-07-24 10:44:00,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2018-07-24 10:44:00,413 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 31 [2018-07-24 10:44:00,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 10:44:00,413 INFO L471 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2018-07-24 10:44:00,414 INFO L472 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-07-24 10:44:00,414 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2018-07-24 10:44:00,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-07-24 10:44:00,415 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 10:44:00,416 INFO L353 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 10:44:00,416 INFO L414 AbstractCegarLoop]: === Iteration 5 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 10:44:00,416 INFO L82 PathProgramCache]: Analyzing trace with hash 1704888886, now seen corresponding path program 3 times [2018-07-24 10:44:00,416 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 10:44:00,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:44:00,417 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-24 10:44:00,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:44:00,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 10:44:00,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:44:00,868 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-07-24 10:44:00,869 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:44:00,869 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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 [2018-07-24 10:44:00,878 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-24 10:44:00,879 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-24 10:44:01,205 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-07-24 10:44:01,205 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:44:01,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:01,244 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-07-24 10:44:01,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:44:01,446 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-07-24 10:44:01,467 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:44:01,468 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 10:44:01,484 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-24 10:44:01,484 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-24 10:44:01,560 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-07-24 10:44:01,560 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:44:01,565 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:01,606 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-07-24 10:44:01,606 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:44:01,743 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-07-24 10:44:01,745 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 10:44:01,745 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-07-24 10:44:01,745 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 10:44:01,746 INFO L450 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-07-24 10:44:01,746 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-07-24 10:44:01,747 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-07-24 10:44:01,747 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 6 states. [2018-07-24 10:44:01,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 10:44:01,825 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2018-07-24 10:44:01,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-07-24 10:44:01,827 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 40 [2018-07-24 10:44:01,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 10:44:01,828 INFO L225 Difference]: With dead ends: 55 [2018-07-24 10:44:01,828 INFO L226 Difference]: Without dead ends: 44 [2018-07-24 10:44:01,829 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 154 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-07-24 10:44:01,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-07-24 10:44:01,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2018-07-24 10:44:01,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-07-24 10:44:01,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 48 transitions. [2018-07-24 10:44:01,837 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 48 transitions. Word has length 40 [2018-07-24 10:44:01,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 10:44:01,838 INFO L471 AbstractCegarLoop]: Abstraction has 43 states and 48 transitions. [2018-07-24 10:44:01,838 INFO L472 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-07-24 10:44:01,838 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 48 transitions. [2018-07-24 10:44:01,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-07-24 10:44:01,840 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 10:44:01,840 INFO L353 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 10:44:01,840 INFO L414 AbstractCegarLoop]: === Iteration 6 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 10:44:01,840 INFO L82 PathProgramCache]: Analyzing trace with hash 562209556, now seen corresponding path program 4 times [2018-07-24 10:44:01,840 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 10:44:01,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:44:01,841 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-24 10:44:01,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:44:01,842 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 10:44:01,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:44:02,026 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-07-24 10:44:02,026 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:44:02,027 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 10:44:02,035 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-24 10:44:02,036 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-24 10:44:02,057 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-24 10:44:02,057 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:44:02,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:02,119 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-07-24 10:44:02,119 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:44:02,346 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-07-24 10:44:02,366 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:44:02,367 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 10:44:02,383 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-24 10:44:02,383 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-24 10:44:02,425 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-24 10:44:02,425 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:44:02,430 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:02,465 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-07-24 10:44:02,466 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:44:02,499 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 16 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-07-24 10:44:02,500 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 10:44:02,501 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-07-24 10:44:02,501 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 10:44:02,502 INFO L450 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-07-24 10:44:02,503 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-07-24 10:44:02,503 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-07-24 10:44:02,503 INFO L87 Difference]: Start difference. First operand 43 states and 48 transitions. Second operand 7 states. [2018-07-24 10:44:02,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 10:44:02,668 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2018-07-24 10:44:02,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-07-24 10:44:02,671 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 49 [2018-07-24 10:44:02,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 10:44:02,672 INFO L225 Difference]: With dead ends: 60 [2018-07-24 10:44:02,672 INFO L226 Difference]: Without dead ends: 49 [2018-07-24 10:44:02,673 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 189 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-07-24 10:44:02,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-07-24 10:44:02,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-07-24 10:44:02,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-07-24 10:44:02,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2018-07-24 10:44:02,682 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 49 [2018-07-24 10:44:02,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 10:44:02,683 INFO L471 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2018-07-24 10:44:02,683 INFO L472 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-07-24 10:44:02,683 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2018-07-24 10:44:02,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-07-24 10:44:02,685 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 10:44:02,685 INFO L353 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 10:44:02,686 INFO L414 AbstractCegarLoop]: === Iteration 7 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 10:44:02,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1080665078, now seen corresponding path program 5 times [2018-07-24 10:44:02,686 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 10:44:02,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:44:02,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-24 10:44:02,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:44:02,687 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 10:44:02,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:44:02,871 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 65 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-07-24 10:44:02,872 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:44:02,872 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 10:44:02,880 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-24 10:44:02,880 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-24 10:44:03,178 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-07-24 10:44:03,178 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:44:03,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:03,223 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 65 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-07-24 10:44:03,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:44:03,986 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 65 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-07-24 10:44:04,008 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:44:04,009 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 10:44:04,024 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-24 10:44:04,024 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-24 10:44:04,170 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-07-24 10:44:04,170 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:44:04,175 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:04,214 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 65 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-07-24 10:44:04,214 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:44:04,350 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 65 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-07-24 10:44:04,353 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 10:44:04,353 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-07-24 10:44:04,353 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 10:44:04,354 INFO L450 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-07-24 10:44:04,354 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-07-24 10:44:04,354 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2018-07-24 10:44:04,355 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand 8 states. [2018-07-24 10:44:04,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 10:44:04,519 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2018-07-24 10:44:04,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-07-24 10:44:04,520 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 58 [2018-07-24 10:44:04,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 10:44:04,522 INFO L225 Difference]: With dead ends: 65 [2018-07-24 10:44:04,522 INFO L226 Difference]: Without dead ends: 54 [2018-07-24 10:44:04,523 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 224 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2018-07-24 10:44:04,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-07-24 10:44:04,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-07-24 10:44:04,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-07-24 10:44:04,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2018-07-24 10:44:04,531 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 58 [2018-07-24 10:44:04,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 10:44:04,532 INFO L471 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2018-07-24 10:44:04,532 INFO L472 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-07-24 10:44:04,532 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2018-07-24 10:44:04,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-07-24 10:44:04,534 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 10:44:04,534 INFO L353 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 10:44:04,534 INFO L414 AbstractCegarLoop]: === Iteration 8 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 10:44:04,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1640464044, now seen corresponding path program 6 times [2018-07-24 10:44:04,535 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 10:44:04,535 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:44:04,536 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-24 10:44:04,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 10:44:04,536 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 10:44:04,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 10:44:04,770 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 24 proven. 93 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-07-24 10:44:04,771 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:44:04,771 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 10:44:04,781 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-24 10:44:04,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-24 10:44:05,120 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2018-07-24 10:44:05,121 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:44:05,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:44:06,078 WARN L169 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 18 [2018-07-24 10:44:22,117 WARN L169 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2018-07-24 10:44:27,540 WARN L169 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 31 [2018-07-24 10:44:30,673 WARN L169 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 34 [2018-07-24 10:44:42,907 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 36 proven. 99 refuted. 6 times theorem prover too weak. 36 trivial. 0 not checked. [2018-07-24 10:44:42,907 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 10:46:05,554 WARN L169 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 39 DAG size of output: 34 [2018-07-24 10:46:12,609 WARN L169 SmtUtils]: Spent 2.48 s on a formula simplification that was a NOOP. DAG size: 35 [2018-07-24 10:46:27,138 WARN L169 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 35 [2018-07-24 10:47:02,055 WARN L1032 $PredicateComparison]: unable to prove that (or (forall ((v_prenex_3 Int) (v_main_~sn~0_BEFORE_CALL_12 Int) (v_main_~x~0_BEFORE_CALL_68 Int)) (let ((.cse3 (* 2 v_prenex_3)) (.cse2 (* 2 v_main_~x~0_BEFORE_CALL_68))) (or (exists ((v_prenex_4 Int) (main_~sn~0 Int)) (let ((.cse0 (* 2 v_prenex_4)) (.cse1 (* 2 v_main_~x~0_BEFORE_CALL_68))) (and (= (mod .cse0 4294967296) (mod (+ main_~sn~0 8) 4294967296)) (<= 10 (mod (+ v_prenex_4 1) 4294967296)) (= (mod (+ main_~sn~0 10) 4294967296) (mod (+ .cse0 2) 4294967296)) (= (mod main_~sn~0 4294967296) (mod .cse1 4294967296)) (< (mod v_prenex_4 4294967296) 10) (= (mod (+ main_~sn~0 2) 4294967296) (mod (+ .cse1 2) 4294967296))))) (< (mod (+ v_prenex_3 1) 4294967296) 10) (not (= (mod (+ .cse2 2) 4294967296) (mod (+ v_main_~sn~0_BEFORE_CALL_12 2) 4294967296))) (not (= (mod .cse3 4294967296) (mod (+ v_main_~sn~0_BEFORE_CALL_12 8) 4294967296))) (not (= (mod (+ .cse3 2) 4294967296) (mod (+ v_main_~sn~0_BEFORE_CALL_12 10) 4294967296))) (= v_main_~sn~0_BEFORE_CALL_12 0) (= (mod .cse2 4294967296) (mod v_main_~sn~0_BEFORE_CALL_12 4294967296)) (<= 10 (mod v_prenex_3 4294967296))))) (not (= |c___U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assert_#in~cond| 0))) is different from true [2018-07-24 10:47:12,135 WARN L1032 $PredicateComparison]: unable to prove that (or (= c___U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assert_~cond 0) (forall ((v_prenex_3 Int) (v_main_~sn~0_BEFORE_CALL_12 Int) (v_main_~x~0_BEFORE_CALL_68 Int)) (let ((.cse3 (* 2 v_prenex_3)) (.cse2 (* 2 v_main_~x~0_BEFORE_CALL_68))) (or (exists ((v_prenex_4 Int) (main_~sn~0 Int)) (let ((.cse0 (* 2 v_prenex_4)) (.cse1 (* 2 v_main_~x~0_BEFORE_CALL_68))) (and (= (mod .cse0 4294967296) (mod (+ main_~sn~0 8) 4294967296)) (<= 10 (mod (+ v_prenex_4 1) 4294967296)) (= (mod (+ main_~sn~0 10) 4294967296) (mod (+ .cse0 2) 4294967296)) (= (mod main_~sn~0 4294967296) (mod .cse1 4294967296)) (< (mod v_prenex_4 4294967296) 10) (= (mod (+ main_~sn~0 2) 4294967296) (mod (+ .cse1 2) 4294967296))))) (< (mod (+ v_prenex_3 1) 4294967296) 10) (not (= (mod (+ .cse2 2) 4294967296) (mod (+ v_main_~sn~0_BEFORE_CALL_12 2) 4294967296))) (not (= (mod .cse3 4294967296) (mod (+ v_main_~sn~0_BEFORE_CALL_12 8) 4294967296))) (not (= (mod (+ .cse3 2) 4294967296) (mod (+ v_main_~sn~0_BEFORE_CALL_12 10) 4294967296))) (= v_main_~sn~0_BEFORE_CALL_12 0) (= (mod .cse2 4294967296) (mod v_main_~sn~0_BEFORE_CALL_12 4294967296)) (<= 10 (mod v_prenex_3 4294967296))))) (not (= |c___U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loops_sum___false_unreach_call_true_termination_i____VERIFIER_assert_#in~cond| 0))) is different from true [2018-07-24 10:47:38,804 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 28 proven. 104 refuted. 11 times theorem prover too weak. 27 trivial. 7 not checked. [2018-07-24 10:47:38,839 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 10:47:38,840 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 10:47:38,864 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-24 10:47:38,865 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-24 10:47:39,075 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2018-07-24 10:47:39,075 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 10:47:39,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 10:48:28,506 WARN L169 SmtUtils]: Spent 1.91 s on a formula simplification that was a NOOP. DAG size: 30 Received shutdown request... [2018-07-24 10:48:46,254 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-07-24 10:48:46,455 WARN L512 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 10:48:46,455 WARN L540 AbstractCegarLoop]: Verification canceled [2018-07-24 10:48:46,461 WARN L202 ceAbstractionStarter]: Timeout [2018-07-24 10:48:46,461 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.07 10:48:46 BoogieIcfgContainer [2018-07-24 10:48:46,461 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-07-24 10:48:46,462 INFO L168 Benchmark]: Toolchain (without parser) took 289231.24 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 866.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -797.9 MB). Peak memory consumption was 68.7 MB. Max. memory is 7.1 GB. [2018-07-24 10:48:46,463 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-07-24 10:48:46,463 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.72 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-07-24 10:48:46,464 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.96 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-07-24 10:48:46,465 INFO L168 Benchmark]: Boogie Preprocessor took 20.76 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-07-24 10:48:46,465 INFO L168 Benchmark]: RCFGBuilder took 390.63 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 703.6 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -754.1 MB). Peak memory consumption was 27.0 MB. Max. memory is 7.1 GB. [2018-07-24 10:48:46,466 INFO L168 Benchmark]: TraceAbstraction took 288528.50 ms. Allocated memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: 163.1 MB). Free memory was 2.1 GB in the beginning and 2.2 GB in the end (delta: -54.4 MB). Peak memory consumption was 108.7 MB. Max. memory is 7.1 GB. [2018-07-24 10:48:46,470 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.72 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 22.96 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 20.76 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 390.63 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 703.6 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -754.1 MB). Peak memory consumption was 27.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 288528.50 ms. Allocated memory was 2.2 GB in the beginning and 2.4 GB in the end (delta: 163.1 MB). Free memory was 2.1 GB in the beginning and 2.2 GB in the end (delta: -54.4 MB). Peak memory consumption was 108.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was analyzing trace of length 68 with TraceHistMax 7, while TraceCheckSpWp was constructing forward predicates, while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 45 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 288.4s OverallTime, 8 OverallIterations, 7 TraceHistogramMax, 1.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 161 SDtfs, 16 SDslu, 502 SDs, 0 SdLazy, 326 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 839 GetRequests, 775 SyntacticMatches, 15 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 2.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=53occurred in iteration=7, 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, 7 MinimizatonAttempts, 6 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 3.7s InterpolantComputationTime, 626 NumberOfCodeBlocks, 626 NumberOfCodeBlocksAsserted, 37 NumberOfCheckSat, 999 ConstructedInterpolants, 0 QuantifiedInterpolants, 158907 SizeOfPredicates, 10 NumberOfNonLiveVariables, 800 ConjunctsInSsa, 90 ConjunctsInUnsatCore, 27 InterpolantComputations, 2 PerfectInterpolantSequences, 700/1425 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/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/sum03_false-unreach-call_true-termination.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-Benchmark-0-2018-07-24_10-48-46-483.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/sum03_false-unreach-call_true-termination.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-TraceAbstractionBenchmarks-0-2018-07-24_10-48-46-483.csv Completed graceful shutdown