java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem12_label50_false-unreach-call.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 18:20:56,160 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 18:20:56,166 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 18:20:56,179 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 18:20:56,180 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 18:20:56,181 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 18:20:56,185 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 18:20:56,187 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 18:20:56,190 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 18:20:56,196 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 18:20:56,197 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 18:20:56,198 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 18:20:56,199 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 18:20:56,203 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 18:20:56,204 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 18:20:56,205 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 18:20:56,206 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 18:20:56,208 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 18:20:56,210 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 18:20:56,211 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 18:20:56,212 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 18:20:56,213 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 18:20:56,215 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 18:20:56,216 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 18:20:56,216 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 18:20:56,217 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 18:20:56,218 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 18:20:56,218 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 18:20:56,219 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 18:20:56,220 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 18:20:56,220 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 18:20:56,221 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-24 18:20:56,221 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-24 18:20:56,221 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-24 18:20:56,222 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-24 18:20:56,223 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-24 18:20:56,223 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-24 18:20:56,256 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 18:20:56,256 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 18:20:56,257 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 18:20:56,257 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 18:20:56,258 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 18:20:56,258 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 18:20:56,258 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 18:20:56,258 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 18:20:56,258 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 18:20:56,259 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 18:20:56,260 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 18:20:56,261 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 18:20:56,261 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 18:20:56,262 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 18:20:56,262 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 18:20:56,262 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 18:20:56,262 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 18:20:56,262 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 18:20:56,263 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 18:20:56,263 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 18:20:56,263 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 18:20:56,263 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 18:20:56,263 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 18:20:56,264 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 18:20:56,265 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 18:20:56,265 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 18:20:56,265 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 18:20:56,265 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 18:20:56,266 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 18:20:56,266 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 18:20:56,266 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 18:20:56,266 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 18:20:56,266 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 18:20:56,266 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 18:20:56,343 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 18:20:56,360 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 18:20:56,366 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 18:20:56,367 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 18:20:56,368 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 18:20:56,369 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem12_label50_false-unreach-call.c [2018-10-24 18:20:56,428 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/efd0ab5d9/6d3416f846d14fe99b982c1750c04f82/FLAG7e33b8a4a [2018-10-24 18:20:57,131 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 18:20:57,132 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem12_label50_false-unreach-call.c [2018-10-24 18:20:57,168 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/efd0ab5d9/6d3416f846d14fe99b982c1750c04f82/FLAG7e33b8a4a [2018-10-24 18:20:57,188 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/efd0ab5d9/6d3416f846d14fe99b982c1750c04f82 [2018-10-24 18:20:57,202 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 18:20:57,204 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 18:20:57,205 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 18:20:57,205 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 18:20:57,210 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 18:20:57,211 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 06:20:57" (1/1) ... [2018-10-24 18:20:57,214 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46764b1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:57, skipping insertion in model container [2018-10-24 18:20:57,215 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 06:20:57" (1/1) ... [2018-10-24 18:20:57,226 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 18:20:57,389 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 18:20:58,694 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 18:20:58,699 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 18:20:59,439 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 18:20:59,477 INFO L193 MainTranslator]: Completed translation [2018-10-24 18:20:59,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59 WrapperNode [2018-10-24 18:20:59,478 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 18:20:59,479 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 18:20:59,479 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 18:20:59,479 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 18:20:59,491 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:20:59,561 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:21:00,011 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 18:21:00,012 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 18:21:00,012 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 18:21:00,012 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 18:21:00,023 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:21:00,023 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:21:00,047 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:21:00,048 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:21:00,158 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:21:00,202 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:21:00,241 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... [2018-10-24 18:21:00,277 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 18:21:00,277 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 18:21:00,278 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 18:21:00,278 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 18:21:00,279 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-24 18:21:00,358 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 18:21:00,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 18:21:00,359 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2018-10-24 18:21:00,359 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2018-10-24 18:21:00,360 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2018-10-24 18:21:00,360 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2018-10-24 18:21:00,360 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2018-10-24 18:21:00,360 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2018-10-24 18:21:00,360 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2018-10-24 18:21:00,361 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2018-10-24 18:21:00,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 18:21:00,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 18:21:00,361 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 18:21:00,363 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 18:21:11,999 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 18:21:12,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 06:21:12 BoogieIcfgContainer [2018-10-24 18:21:12,000 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 18:21:12,002 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 18:21:12,002 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 18:21:12,005 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 18:21:12,006 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 06:20:57" (1/3) ... [2018-10-24 18:21:12,007 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ef33c60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 06:21:12, skipping insertion in model container [2018-10-24 18:21:12,007 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 06:20:59" (2/3) ... [2018-10-24 18:21:12,007 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ef33c60 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 06:21:12, skipping insertion in model container [2018-10-24 18:21:12,007 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 06:21:12" (3/3) ... [2018-10-24 18:21:12,009 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem12_label50_false-unreach-call.c [2018-10-24 18:21:12,018 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 18:21:12,027 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 18:21:12,043 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 18:21:12,090 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 18:21:12,091 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 18:21:12,091 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 18:21:12,091 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 18:21:12,091 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 18:21:12,091 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 18:21:12,092 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 18:21:12,092 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 18:21:12,274 INFO L276 IsEmpty]: Start isEmpty. Operand 840 states. [2018-10-24 18:21:12,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-24 18:21:12,281 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 18:21:12,282 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 18:21:12,285 INFO L424 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 18:21:12,304 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 18:21:12,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1732506723, now seen corresponding path program 1 times [2018-10-24 18:21:12,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 18:21:12,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 18:21:12,373 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 18:21:12,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 18:21:12,374 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 18:21:12,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 18:21:12,824 WARN L179 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 4 [2018-10-24 18:21:12,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 18:21:12,938 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 18:21:12,938 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-24 18:21:12,939 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 18:21:12,946 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-24 18:21:12,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-24 18:21:12,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 18:21:12,969 INFO L87 Difference]: Start difference. First operand 840 states. Second operand 3 states. [2018-10-24 18:21:22,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 18:21:22,447 INFO L93 Difference]: Finished difference Result 2446 states and 4700 transitions. [2018-10-24 18:21:22,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-24 18:21:22,449 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2018-10-24 18:21:22,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 18:21:22,482 INFO L225 Difference]: With dead ends: 2446 [2018-10-24 18:21:22,482 INFO L226 Difference]: Without dead ends: 1604 [2018-10-24 18:21:22,493 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-24 18:21:22,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1604 states. [2018-10-24 18:21:22,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1604 to 1604. [2018-10-24 18:21:22,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1604 states. [2018-10-24 18:21:22,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1604 states to 1604 states and 3014 transitions. [2018-10-24 18:21:22,653 INFO L78 Accepts]: Start accepts. Automaton has 1604 states and 3014 transitions. Word has length 25 [2018-10-24 18:21:22,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 18:21:22,654 INFO L481 AbstractCegarLoop]: Abstraction has 1604 states and 3014 transitions. [2018-10-24 18:21:22,654 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-24 18:21:22,654 INFO L276 IsEmpty]: Start isEmpty. Operand 1604 states and 3014 transitions. [2018-10-24 18:21:22,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-24 18:21:22,660 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 18:21:22,660 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 18:21:22,661 INFO L424 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 18:21:22,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 18:21:22,661 INFO L82 PathProgramCache]: Analyzing trace with hash 149843156, now seen corresponding path program 1 times [2018-10-24 18:21:22,661 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 18:21:22,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 18:21:22,663 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 18:21:22,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 18:21:22,663 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 18:21:22,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 18:21:22,901 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 18:21:22,901 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 18:21:22,901 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 18:21:22,901 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 18:21:22,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 18:21:22,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 18:21:22,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-10-24 18:21:22,904 INFO L87 Difference]: Start difference. First operand 1604 states and 3014 transitions. Second operand 5 states. [2018-10-24 18:21:39,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 18:21:39,398 INFO L93 Difference]: Finished difference Result 4873 states and 9168 transitions. [2018-10-24 18:21:39,408 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 18:21:39,408 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 95 [2018-10-24 18:21:39,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 18:21:39,432 INFO L225 Difference]: With dead ends: 4873 [2018-10-24 18:21:39,433 INFO L226 Difference]: Without dead ends: 3275 [2018-10-24 18:21:39,439 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-10-24 18:21:39,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3275 states. [2018-10-24 18:21:39,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3275 to 3241. [2018-10-24 18:21:39,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3241 states. [2018-10-24 18:21:39,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3241 states to 3241 states and 5443 transitions. [2018-10-24 18:21:39,590 INFO L78 Accepts]: Start accepts. Automaton has 3241 states and 5443 transitions. Word has length 95 [2018-10-24 18:21:39,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 18:21:39,592 INFO L481 AbstractCegarLoop]: Abstraction has 3241 states and 5443 transitions. [2018-10-24 18:21:39,592 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 18:21:39,592 INFO L276 IsEmpty]: Start isEmpty. Operand 3241 states and 5443 transitions. [2018-10-24 18:21:39,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-10-24 18:21:39,599 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 18:21:39,599 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 18:21:39,599 INFO L424 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 18:21:39,599 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 18:21:39,601 INFO L82 PathProgramCache]: Analyzing trace with hash 757765696, now seen corresponding path program 1 times [2018-10-24 18:21:39,601 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 18:21:39,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 18:21:39,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 18:21:39,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 18:21:39,603 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 18:21:39,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 18:21:39,888 WARN L179 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 4 [2018-10-24 18:21:39,972 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 18:21:39,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 18:21:39,973 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 18:21:39,974 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 102 with the following transitions: [2018-10-24 18:21:39,976 INFO L202 CegarAbsIntRunner]: [0], [1], [1868], [1875], [1883], [1891], [1899], [1907], [1915], [1923], [1931], [1939], [1947], [1955], [1963], [1967], [1969], [1972], [1980], [1988], [1996], [2004], [2012], [2020], [2028], [2036], [2044], [2052], [2060], [2068], [2076], [2084], [2092], [2100], [2108], [2116], [2124], [2132], [2140], [2148], [2156], [2164], [2172], [2180], [2188], [2196], [2204], [2212], [2220], [2228], [2236], [2244], [2252], [2260], [2268], [2276], [2284], [2292], [2300], [2308], [2316], [2324], [2332], [2340], [2348], [2356], [2361], [2365], [2369], [2373], [2377], [2381], [2384], [3240], [3244], [3248], [3254], [3258], [3260], [3271], [3272], [3273], [3275], [3276] [2018-10-24 18:21:40,063 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-24 18:21:40,064 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 18:21:44,808 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-24 18:21:44,810 INFO L272 AbstractInterpreter]: Visited 83 different actions 159 times. Merged at 4 different actions 4 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 26 variables. [2018-10-24 18:21:44,870 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 18:21:44,870 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-24 18:21:47,063 INFO L232 lantSequenceWeakener]: Weakened 12 states. On average, predicates are now at 80.9% of their original sizes. [2018-10-24 18:21:47,063 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-24 18:21:58,713 INFO L413 sIntCurrentIteration]: We have 100 unified AI predicates [2018-10-24 18:21:58,713 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-24 18:21:58,714 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-24 18:21:58,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [16] imperfect sequences [7] total 21 [2018-10-24 18:21:58,714 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 18:21:58,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 18:21:58,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 18:21:58,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-24 18:21:58,716 INFO L87 Difference]: Start difference. First operand 3241 states and 5443 transitions. Second operand 16 states. [2018-10-24 18:22:23,315 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. Received shutdown request... [2018-10-24 18:24:46,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 18:24:46,617 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 18:24:46,622 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 18:24:46,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 06:24:46 BoogieIcfgContainer [2018-10-24 18:24:46,623 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 18:24:46,624 INFO L168 Benchmark]: Toolchain (without parser) took 229420.85 ms. Allocated memory was 1.5 GB in the beginning and 4.2 GB in the end (delta: 2.7 GB). Free memory was 1.4 GB in the beginning and 3.9 GB in the end (delta: -2.5 GB). Peak memory consumption was 167.6 MB. Max. memory is 7.1 GB. [2018-10-24 18:24:46,625 INFO L168 Benchmark]: CDTParser took 0.20 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. [2018-10-24 18:24:46,626 INFO L168 Benchmark]: CACSL2BoogieTranslator took 2273.10 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.2 GB in the end (delta: 200.8 MB). Peak memory consumption was 200.8 MB. Max. memory is 7.1 GB. [2018-10-24 18:24:46,626 INFO L168 Benchmark]: Boogie Procedure Inliner took 532.91 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 770.2 MB). Free memory was 1.2 GB in the beginning and 2.2 GB in the end (delta: -1.0 GB). Peak memory consumption was 69.0 MB. Max. memory is 7.1 GB. [2018-10-24 18:24:46,627 INFO L168 Benchmark]: Boogie Preprocessor took 264.86 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: 38.0 MB). Peak memory consumption was 38.0 MB. Max. memory is 7.1 GB. [2018-10-24 18:24:46,629 INFO L168 Benchmark]: RCFGBuilder took 11723.06 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 1.5 GB in the end (delta: 657.4 MB). Peak memory consumption was 657.4 MB. Max. memory is 7.1 GB. [2018-10-24 18:24:46,630 INFO L168 Benchmark]: TraceAbstraction took 214621.24 ms. Allocated memory was 2.3 GB in the beginning and 4.2 GB in the end (delta: 1.9 GB). Free memory was 1.5 GB in the beginning and 3.9 GB in the end (delta: -2.4 GB). There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 18:24:46,637 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 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 2273.10 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.2 GB in the end (delta: 200.8 MB). Peak memory consumption was 200.8 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 532.91 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 770.2 MB). Free memory was 1.2 GB in the beginning and 2.2 GB in the end (delta: -1.0 GB). Peak memory consumption was 69.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 264.86 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.2 GB in the end (delta: 38.0 MB). Peak memory consumption was 38.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 11723.06 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 1.5 GB in the end (delta: 657.4 MB). Peak memory consumption was 657.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 214621.24 ms. Allocated memory was 2.3 GB in the beginning and 4.2 GB in the end (delta: 1.9 GB). Free memory was 1.5 GB in the beginning and 3.9 GB in the end (delta: -2.4 GB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 66]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 66). Cancelled while BasicCegarLoop was constructing difference of abstraction (3241states) and FLOYD_HOARE automaton (currently 16 states, 16 states before enhancement),while ReachableStatesComputation was computing reachable states (1988 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 840 locations, 1 error locations. TIMEOUT Result, 214.5s OverallTime, 3 OverallIterations, 2 TraceHistogramMax, 193.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 447 SDtfs, 6730 SDslu, 388 SDs, 0 SdLazy, 8239 SolverSat, 1726 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 108.6s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 119 GetRequests, 89 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 14.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=3241occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 4.8s AbstIntTime, 1 AbstIntIterations, 1 AbstIntStrong, 0.9910923076923077 AbsIntWeakeningRatio, 0.21 AbsIntAvgWeakeningVarsNumRemoved, 424.73 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 2 MinimizatonAttempts, 34 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 221 NumberOfCodeBlocks, 221 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 218 ConstructedInterpolants, 0 QuantifiedInterpolants, 91572 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 2 PerfectInterpolantSequences, 29/36 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown