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/default/taipan/svcomp-Reach-64bit-Taipan_Default-old.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem14_label27_false-unreach-call_false-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-dd2f093 [2018-07-23 19:35:26,903 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-07-23 19:35:26,905 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-07-23 19:35:26,917 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-07-23 19:35:26,917 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-07-23 19:35:26,918 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-07-23 19:35:26,920 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-07-23 19:35:26,922 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-07-23 19:35:26,923 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-07-23 19:35:26,924 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-07-23 19:35:26,925 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-07-23 19:35:26,925 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-07-23 19:35:26,926 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-07-23 19:35:26,927 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-07-23 19:35:26,928 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-07-23 19:35:26,931 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-07-23 19:35:26,932 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-07-23 19:35:26,933 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-07-23 19:35:26,941 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-07-23 19:35:26,946 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-07-23 19:35:26,947 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-07-23 19:35:26,948 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-07-23 19:35:26,952 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-07-23 19:35:26,952 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-07-23 19:35:26,956 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-07-23 19:35:26,957 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-07-23 19:35:26,958 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-07-23 19:35:26,962 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-07-23 19:35:26,963 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-07-23 19:35:26,968 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-07-23 19:35:26,968 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-07-23 19:35:26,969 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-07-23 19:35:26,969 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-07-23 19:35:26,970 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-07-23 19:35:26,972 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-07-23 19:35:26,973 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-07-23 19:35:26,973 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-old.epf [2018-07-23 19:35:27,005 INFO L110 SettingsManager]: Loading preferences was successful [2018-07-23 19:35:27,006 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-07-23 19:35:27,007 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-07-23 19:35:27,007 INFO L133 SettingsManager]: * User list type=DISABLED [2018-07-23 19:35:27,007 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-07-23 19:35:27,009 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-07-23 19:35:27,010 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-07-23 19:35:27,010 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-07-23 19:35:27,010 INFO L133 SettingsManager]: * Log string format=TERM [2018-07-23 19:35:27,010 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-07-23 19:35:27,010 INFO L133 SettingsManager]: * Interval Domain=false [2018-07-23 19:35:27,011 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-07-23 19:35:27,011 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-07-23 19:35:27,011 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-07-23 19:35:27,012 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-07-23 19:35:27,012 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-07-23 19:35:27,012 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-07-23 19:35:27,012 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-07-23 19:35:27,015 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-07-23 19:35:27,015 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-07-23 19:35:27,015 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-07-23 19:35:27,016 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-07-23 19:35:27,016 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-07-23 19:35:27,016 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-07-23 19:35:27,016 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-07-23 19:35:27,016 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-07-23 19:35:27,017 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-07-23 19:35:27,017 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-07-23 19:35:27,017 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-07-23 19:35:27,018 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-07-23 19:35:27,018 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-07-23 19:35:27,018 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-07-23 19:35:27,019 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-07-23 19:35:27,081 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-07-23 19:35:27,096 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-07-23 19:35:27,102 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-07-23 19:35:27,104 INFO L271 PluginConnector]: Initializing CDTParser... [2018-07-23 19:35:27,104 INFO L276 PluginConnector]: CDTParser initialized [2018-07-23 19:35:27,105 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem14_label27_false-unreach-call_false-termination.c [2018-07-23 19:35:27,473 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a30e4164/8d314d834e884f11a99d6f717ed60036/FLAG3016f2c93 [2018-07-23 19:35:27,796 INFO L276 CDTParser]: Found 1 translation units. [2018-07-23 19:35:27,797 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem14_label27_false-unreach-call_false-termination.c [2018-07-23 19:35:27,825 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a30e4164/8d314d834e884f11a99d6f717ed60036/FLAG3016f2c93 [2018-07-23 19:35:27,848 INFO L332 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a30e4164/8d314d834e884f11a99d6f717ed60036 [2018-07-23 19:35:27,860 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-07-23 19:35:27,864 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-07-23 19:35:27,865 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-07-23 19:35:27,865 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-07-23 19:35:27,872 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-07-23 19:35:27,873 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.07 07:35:27" (1/1) ... [2018-07-23 19:35:27,876 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22224105 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:27, skipping insertion in model container [2018-07-23 19:35:27,876 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.07 07:35:27" (1/1) ... [2018-07-23 19:35:28,100 INFO L179 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-07-23 19:35:28,426 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-23 19:35:28,444 INFO L422 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-07-23 19:35:28,675 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-23 19:35:28,731 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28 WrapperNode [2018-07-23 19:35:28,731 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-07-23 19:35:28,732 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-07-23 19:35:28,733 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-07-23 19:35:28,733 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-07-23 19:35:28,743 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:28,781 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:28,876 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-07-23 19:35:28,876 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-07-23 19:35:28,877 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-07-23 19:35:28,877 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-07-23 19:35:28,888 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:28,889 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:28,896 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:28,896 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:28,934 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:29,121 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:29,128 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (1/1) ... [2018-07-23 19:35:29,138 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-07-23 19:35:29,139 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-07-23 19:35:29,139 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-07-23 19:35:29,139 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-07-23 19:35:29,140 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (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 [2018-07-23 19:35:29,205 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-07-23 19:35:29,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-07-23 19:35:29,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-07-23 19:35:29,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-07-23 19:35:29,206 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-07-23 19:35:29,207 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-07-23 19:35:29,207 INFO L130 BoogieDeclarations]: Found specification of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___false_unreach_call_false_termination_c__calculate_output [2018-07-23 19:35:29,207 INFO L138 BoogieDeclarations]: Found implementation of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___false_unreach_call_false_termination_c__calculate_output [2018-07-23 19:35:33,000 INFO L261 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-07-23 19:35:33,001 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.07 07:35:33 BoogieIcfgContainer [2018-07-23 19:35:33,001 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-07-23 19:35:33,004 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-07-23 19:35:33,004 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-07-23 19:35:33,017 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-07-23 19:35:33,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.07 07:35:27" (1/3) ... [2018-07-23 19:35:33,019 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4da71df9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.07 07:35:33, skipping insertion in model container [2018-07-23 19:35:33,019 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.07 07:35:28" (2/3) ... [2018-07-23 19:35:33,019 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4da71df9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.07 07:35:33, skipping insertion in model container [2018-07-23 19:35:33,020 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.07 07:35:33" (3/3) ... [2018-07-23 19:35:33,025 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem14_label27_false-unreach-call_false-termination.c [2018-07-23 19:35:33,038 INFO L132 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-07-23 19:35:33,046 INFO L144 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-07-23 19:35:33,101 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2018-07-23 19:35:33,102 INFO L373 AbstractCegarLoop]: Interprodecural is true [2018-07-23 19:35:33,102 INFO L374 AbstractCegarLoop]: Hoare is true [2018-07-23 19:35:33,102 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-07-23 19:35:33,102 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-07-23 19:35:33,103 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-07-23 19:35:33,103 INFO L378 AbstractCegarLoop]: Difference is false [2018-07-23 19:35:33,103 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-07-23 19:35:33,103 INFO L384 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-07-23 19:35:33,132 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states. [2018-07-23 19:35:33,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-07-23 19:35:33,143 INFO L345 BasicCegarLoop]: Found error trace [2018-07-23 19:35:33,144 INFO L353 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-23 19:35:33,145 INFO L414 AbstractCegarLoop]: === Iteration 1 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___false_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-23 19:35:33,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1345553532, now seen corresponding path program 1 times [2018-07-23 19:35:33,152 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-23 19:35:33,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:35:33,197 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-23 19:35:33,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:35:33,198 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-23 19:35:33,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-23 19:35:33,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-23 19:35:33,608 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-23 19:35:33,609 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-07-23 19:35:33,609 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-23 19:35:33,617 INFO L450 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-07-23 19:35:33,632 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-07-23 19:35:33,633 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-07-23 19:35:33,636 INFO L87 Difference]: Start difference. First operand 255 states. Second operand 3 states. [2018-07-23 19:35:35,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-23 19:35:35,484 INFO L93 Difference]: Finished difference Result 691 states and 1226 transitions. [2018-07-23 19:35:35,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-07-23 19:35:35,487 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 36 [2018-07-23 19:35:35,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-23 19:35:35,509 INFO L225 Difference]: With dead ends: 691 [2018-07-23 19:35:35,510 INFO L226 Difference]: Without dead ends: 434 [2018-07-23 19:35:35,518 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-07-23 19:35:35,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2018-07-23 19:35:35,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 434. [2018-07-23 19:35:35,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2018-07-23 19:35:35,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 765 transitions. [2018-07-23 19:35:35,603 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 765 transitions. Word has length 36 [2018-07-23 19:35:35,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-23 19:35:35,604 INFO L471 AbstractCegarLoop]: Abstraction has 434 states and 765 transitions. [2018-07-23 19:35:35,604 INFO L472 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-07-23 19:35:35,604 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 765 transitions. [2018-07-23 19:35:35,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-07-23 19:35:35,610 INFO L345 BasicCegarLoop]: Found error trace [2018-07-23 19:35:35,611 INFO L353 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2018-07-23 19:35:35,611 INFO L414 AbstractCegarLoop]: === Iteration 2 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___false_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-23 19:35:35,612 INFO L82 PathProgramCache]: Analyzing trace with hash 892804791, now seen corresponding path program 1 times [2018-07-23 19:35:35,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-23 19:35:35,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:35:35,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-23 19:35:35,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:35:35,614 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-23 19:35:35,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-23 19:35:35,992 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-23 19:35:35,992 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-23 19:35:35,993 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-07-23 19:35:35,993 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-23 19:35:35,995 INFO L450 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-07-23 19:35:35,995 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-07-23 19:35:35,995 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2018-07-23 19:35:35,996 INFO L87 Difference]: Start difference. First operand 434 states and 765 transitions. Second operand 6 states. [2018-07-23 19:35:39,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-23 19:35:39,239 INFO L93 Difference]: Finished difference Result 1062 states and 1897 transitions. [2018-07-23 19:35:39,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-07-23 19:35:39,241 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 111 [2018-07-23 19:35:39,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-23 19:35:39,247 INFO L225 Difference]: With dead ends: 1062 [2018-07-23 19:35:39,247 INFO L226 Difference]: Without dead ends: 634 [2018-07-23 19:35:39,251 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2018-07-23 19:35:39,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2018-07-23 19:35:39,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 625. [2018-07-23 19:35:39,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 625 states. [2018-07-23 19:35:39,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 1019 transitions. [2018-07-23 19:35:39,293 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 1019 transitions. Word has length 111 [2018-07-23 19:35:39,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-23 19:35:39,294 INFO L471 AbstractCegarLoop]: Abstraction has 625 states and 1019 transitions. [2018-07-23 19:35:39,294 INFO L472 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-07-23 19:35:39,294 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 1019 transitions. [2018-07-23 19:35:39,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-07-23 19:35:39,297 INFO L345 BasicCegarLoop]: Found error trace [2018-07-23 19:35:39,298 INFO L353 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2018-07-23 19:35:39,298 INFO L414 AbstractCegarLoop]: === Iteration 3 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___false_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-23 19:35:39,298 INFO L82 PathProgramCache]: Analyzing trace with hash -393333916, now seen corresponding path program 1 times [2018-07-23 19:35:39,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-23 19:35:39,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:35:39,300 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-23 19:35:39,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:35:39,300 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-23 19:35:39,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-23 19:35:39,460 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-23 19:35:39,460 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-23 19:35:39,461 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-07-23 19:35:39,461 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-23 19:35:39,461 INFO L450 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-07-23 19:35:39,462 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-07-23 19:35:39,462 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-23 19:35:39,462 INFO L87 Difference]: Start difference. First operand 625 states and 1019 transitions. Second operand 4 states. [2018-07-23 19:35:43,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-23 19:35:43,597 INFO L93 Difference]: Finished difference Result 2350 states and 4011 transitions. [2018-07-23 19:35:43,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-07-23 19:35:43,599 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 120 [2018-07-23 19:35:43,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-23 19:35:43,616 INFO L225 Difference]: With dead ends: 2350 [2018-07-23 19:35:43,616 INFO L226 Difference]: Without dead ends: 1731 [2018-07-23 19:35:43,622 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-23 19:35:43,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1731 states. [2018-07-23 19:35:43,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1731 to 1731. [2018-07-23 19:35:43,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1731 states. [2018-07-23 19:35:43,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1731 states to 1731 states and 2640 transitions. [2018-07-23 19:35:43,691 INFO L78 Accepts]: Start accepts. Automaton has 1731 states and 2640 transitions. Word has length 120 [2018-07-23 19:35:43,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-23 19:35:43,691 INFO L471 AbstractCegarLoop]: Abstraction has 1731 states and 2640 transitions. [2018-07-23 19:35:43,692 INFO L472 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-07-23 19:35:43,692 INFO L276 IsEmpty]: Start isEmpty. Operand 1731 states and 2640 transitions. [2018-07-23 19:35:43,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-07-23 19:35:43,709 INFO L345 BasicCegarLoop]: Found error trace [2018-07-23 19:35:43,709 INFO L353 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2018-07-23 19:35:43,709 INFO L414 AbstractCegarLoop]: === Iteration 4 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___false_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-23 19:35:43,710 INFO L82 PathProgramCache]: Analyzing trace with hash 914752156, now seen corresponding path program 1 times [2018-07-23 19:35:43,710 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-23 19:35:43,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:35:43,712 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-23 19:35:43,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:35:43,712 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-23 19:35:43,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-23 19:35:44,322 WARN L169 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 10 [2018-07-23 19:35:44,796 WARN L169 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-07-23 19:35:44,962 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 58 proven. 76 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-23 19:35:44,962 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-23 19:35:44,962 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-23 19:35:44,963 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 231 with the following transitions: [2018-07-23 19:35:44,965 INFO L201 CegarAbsIntRunner]: [0], [1], [5], [9], [15], [19], [21], [26], [33], [41], [49], [57], [65], [73], [81], [89], [97], [105], [113], [121], [129], [137], [145], [153], [161], [169], [177], [185], [193], [201], [209], [213], [215], [218], [226], [234], [242], [250], [258], [266], [274], [282], [290], [298], [306], [314], [322], [330], [338], [346], [354], [362], [370], [378], [386], [394], [402], [410], [418], [426], [434], [442], [450], [458], [466], [474], [482], [490], [498], [506], [514], [519], [523], [527], [531], [535], [539], [543], [547], [551], [555], [559], [562], [563], [567], [571], [575], [579], [583], [587], [591], [595], [599], [603], [607], [611], [615], [619], [623], [627], [631], [635], [639], [643], [647], [651], [655], [659], [663], [667], [671], [675], [679], [683], [687], [690], [972], [973], [974], [975], [977], [978] [2018-07-23 19:35:45,036 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-07-23 19:35:45,037 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2018-07-23 19:35:50,498 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-07-23 19:35:50,500 INFO L272 AbstractInterpreter]: Visited 118 different actions 118 times. Never merged. Never widened. Never found a fixpoint. Largest state had 24 variables. [2018-07-23 19:35:50,510 INFO L395 sIntCurrentIteration]: Generating AbsInt predicates [2018-07-23 19:35:54,711 INFO L232 lantSequenceWeakener]: Weakened 222 states. On average, predicates are now at 77.73% of their original sizes. [2018-07-23 19:35:54,711 INFO L408 sIntCurrentIteration]: Unifying AI predicates [2018-07-23 19:35:55,097 INFO L419 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-07-23 19:35:55,098 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-07-23 19:35:55,098 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2018-07-23 19:35:55,098 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-23 19:35:55,099 INFO L450 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-07-23 19:35:55,099 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-07-23 19:35:55,099 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2018-07-23 19:35:55,100 INFO L87 Difference]: Start difference. First operand 1731 states and 2640 transitions. Second operand 7 states. [2018-07-23 19:36:10,446 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-07-23 19:36:29,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-23 19:36:29,792 INFO L93 Difference]: Finished difference Result 3641 states and 5554 transitions. [2018-07-23 19:36:29,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-07-23 19:36:29,792 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 230 [2018-07-23 19:36:29,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-23 19:36:29,809 INFO L225 Difference]: With dead ends: 3641 [2018-07-23 19:36:29,809 INFO L226 Difference]: Without dead ends: 1916 [2018-07-23 19:36:29,817 INFO L573 BasicCegarLoop]: 2 DeclaredPredicates, 230 GetRequests, 224 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2018-07-23 19:36:29,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1916 states. [2018-07-23 19:36:29,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1916 to 1914. [2018-07-23 19:36:29,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1914 states. [2018-07-23 19:36:29,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1914 states to 1914 states and 2831 transitions. [2018-07-23 19:36:29,881 INFO L78 Accepts]: Start accepts. Automaton has 1914 states and 2831 transitions. Word has length 230 [2018-07-23 19:36:29,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-23 19:36:29,881 INFO L471 AbstractCegarLoop]: Abstraction has 1914 states and 2831 transitions. [2018-07-23 19:36:29,881 INFO L472 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-07-23 19:36:29,881 INFO L276 IsEmpty]: Start isEmpty. Operand 1914 states and 2831 transitions. [2018-07-23 19:36:29,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-07-23 19:36:29,890 INFO L345 BasicCegarLoop]: Found error trace [2018-07-23 19:36:29,890 INFO L353 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2018-07-23 19:36:29,891 INFO L414 AbstractCegarLoop]: === Iteration 5 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___false_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-23 19:36:29,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1415940003, now seen corresponding path program 1 times [2018-07-23 19:36:29,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-23 19:36:29,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:36:29,892 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-23 19:36:29,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:36:29,893 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-23 19:36:29,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-23 19:36:30,726 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 175 proven. 154 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-23 19:36:30,727 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-23 19:36:30,727 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-23 19:36:30,727 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 316 with the following transitions: [2018-07-23 19:36:30,728 INFO L201 CegarAbsIntRunner]: [0], [1], [5], [9], [15], [19], [21], [26], [33], [41], [49], [57], [65], [73], [81], [89], [97], [105], [113], [121], [129], [137], [145], [153], [161], [169], [177], [185], [193], [201], [209], [213], [215], [218], [226], [234], [242], [250], [258], [266], [274], [282], [290], [298], [306], [314], [322], [330], [338], [346], [354], [362], [370], [378], [386], [394], [402], [410], [418], [426], [434], [442], [450], [458], [466], [474], [482], [490], [498], [506], [514], [519], [523], [527], [531], [535], [539], [543], [547], [551], [555], [559], [562], [563], [567], [571], [575], [578], [579], [583], [587], [591], [595], [599], [603], [607], [611], [615], [619], [623], [627], [631], [635], [639], [643], [647], [651], [655], [659], [663], [667], [671], [675], [679], [683], [687], [690], [972], [973], [974], [975], [977], [978] [2018-07-23 19:36:30,736 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-07-23 19:36:30,736 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2018-07-23 19:36:43,584 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-07-23 19:36:43,584 INFO L272 AbstractInterpreter]: Visited 122 different actions 237 times. Merged at 4 different actions 4 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 24 variables. [2018-07-23 19:36:43,593 INFO L395 sIntCurrentIteration]: Generating AbsInt predicates [2018-07-23 19:36:51,529 INFO L232 lantSequenceWeakener]: Weakened 313 states. On average, predicates are now at 77.67% of their original sizes. [2018-07-23 19:36:51,530 INFO L408 sIntCurrentIteration]: Unifying AI predicates [2018-07-23 19:36:52,956 INFO L419 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-07-23 19:36:52,957 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-07-23 19:36:52,958 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [11] imperfect sequences [12] total 21 [2018-07-23 19:36:52,958 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-23 19:36:52,958 INFO L450 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-07-23 19:36:52,959 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-07-23 19:36:52,959 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-07-23 19:36:52,959 INFO L87 Difference]: Start difference. First operand 1914 states and 2831 transitions. Second operand 11 states. [2018-07-23 19:37:30,146 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-07-23 19:37:52,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-23 19:37:52,342 INFO L93 Difference]: Finished difference Result 4011 states and 6027 transitions. [2018-07-23 19:37:52,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-07-23 19:37:52,343 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 315 [2018-07-23 19:37:52,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-23 19:37:52,355 INFO L225 Difference]: With dead ends: 4011 [2018-07-23 19:37:52,355 INFO L226 Difference]: Without dead ends: 2286 [2018-07-23 19:37:52,364 INFO L573 BasicCegarLoop]: 2 DeclaredPredicates, 321 GetRequests, 281 SyntacticMatches, 24 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-07-23 19:37:52,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2286 states. [2018-07-23 19:37:52,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2286 to 2283. [2018-07-23 19:37:52,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2283 states. [2018-07-23 19:37:52,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2283 states to 2283 states and 3217 transitions. [2018-07-23 19:37:52,430 INFO L78 Accepts]: Start accepts. Automaton has 2283 states and 3217 transitions. Word has length 315 [2018-07-23 19:37:52,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-23 19:37:52,430 INFO L471 AbstractCegarLoop]: Abstraction has 2283 states and 3217 transitions. [2018-07-23 19:37:52,430 INFO L472 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-07-23 19:37:52,431 INFO L276 IsEmpty]: Start isEmpty. Operand 2283 states and 3217 transitions. [2018-07-23 19:37:52,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 342 [2018-07-23 19:37:52,440 INFO L345 BasicCegarLoop]: Found error trace [2018-07-23 19:37:52,440 INFO L353 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2018-07-23 19:37:52,440 INFO L414 AbstractCegarLoop]: === Iteration 6 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___false_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-23 19:37:52,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1849176561, now seen corresponding path program 1 times [2018-07-23 19:37:52,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-23 19:37:52,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:37:52,442 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-23 19:37:52,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-23 19:37:52,442 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-23 19:37:52,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-23 19:37:52,938 WARN L169 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-07-23 19:37:53,133 WARN L169 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-07-23 19:37:53,350 WARN L169 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-07-23 19:37:53,750 WARN L169 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2018-07-23 19:37:54,219 WARN L169 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2018-07-23 19:37:54,755 WARN L169 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2018-07-23 19:37:55,280 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 100 proven. 255 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-23 19:37:55,280 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-23 19:37:55,280 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-23 19:37:55,281 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 342 with the following transitions: [2018-07-23 19:37:55,281 INFO L201 CegarAbsIntRunner]: [0], [1], [5], [9], [15], [19], [21], [26], [33], [41], [49], [57], [65], [73], [81], [89], [97], [105], [113], [121], [129], [137], [145], [153], [161], [169], [177], [185], [193], [201], [209], [213], [215], [218], [226], [234], [242], [250], [258], [266], [274], [282], [290], [298], [306], [314], [322], [330], [338], [346], [354], [362], [370], [378], [386], [394], [402], [410], [418], [426], [434], [442], [450], [458], [466], [474], [482], [490], [498], [506], [514], [519], [523], [527], [531], [535], [539], [543], [547], [551], [555], [559], [562], [563], [567], [571], [575], [579], [583], [587], [591], [595], [599], [603], [607], [611], [615], [619], [623], [627], [631], [635], [639], [643], [647], [651], [655], [659], [663], [667], [671], [675], [679], [682], [683], [687], [690], [972], [973], [974], [975], [977], [978] [2018-07-23 19:37:55,287 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-07-23 19:37:55,287 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2018-07-23 19:38:14,940 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-07-23 19:38:14,940 INFO L272 AbstractInterpreter]: Visited 122 different actions 238 times. Merged at 5 different actions 5 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 24 variables. [2018-07-23 19:38:14,951 INFO L395 sIntCurrentIteration]: Generating AbsInt predicates [2018-07-23 19:38:30,217 INFO L232 lantSequenceWeakener]: Weakened 339 states. On average, predicates are now at 77.64% of their original sizes. [2018-07-23 19:38:30,217 INFO L408 sIntCurrentIteration]: Unifying AI predicates [2018-07-23 19:38:31,334 INFO L419 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-07-23 19:38:31,334 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-07-23 19:38:31,335 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [11] imperfect sequences [15] total 24 [2018-07-23 19:38:31,335 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-23 19:38:31,335 INFO L450 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-07-23 19:38:31,336 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-07-23 19:38:31,336 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-07-23 19:38:31,336 INFO L87 Difference]: Start difference. First operand 2283 states and 3217 transitions. Second operand 11 states. [2018-07-23 19:39:01,444 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. Received shutdown request... [2018-07-23 19:39:19,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-07-23 19:39:19,553 WARN L540 AbstractCegarLoop]: Verification canceled [2018-07-23 19:39:19,558 WARN L202 ceAbstractionStarter]: Timeout [2018-07-23 19:39:19,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.07 07:39:19 BoogieIcfgContainer [2018-07-23 19:39:19,559 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-07-23 19:39:19,560 INFO L168 Benchmark]: Toolchain (without parser) took 231699.52 ms. Allocated memory was 1.5 GB in the beginning and 4.1 GB in the end (delta: 2.6 GB). Free memory was 1.4 GB in the beginning and 1.8 GB in the end (delta: -383.4 MB). Peak memory consumption was 2.2 GB. Max. memory is 7.1 GB. [2018-07-23 19:39:19,561 INFO L168 Benchmark]: CDTParser took 0.23 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. [2018-07-23 19:39:19,561 INFO L168 Benchmark]: CACSL2BoogieTranslator took 867.01 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: 52.9 MB). Peak memory consumption was 52.9 MB. Max. memory is 7.1 GB. [2018-07-23 19:39:19,562 INFO L168 Benchmark]: Boogie Procedure Inliner took 143.84 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.3 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-07-23 19:39:19,563 INFO L168 Benchmark]: Boogie Preprocessor took 262.11 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 766.0 MB). Free memory was 1.3 GB in the beginning and 2.2 GB in the end (delta: -868.0 MB). Peak memory consumption was 36.8 MB. Max. memory is 7.1 GB. [2018-07-23 19:39:19,564 INFO L168 Benchmark]: RCFGBuilder took 3862.50 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 137.7 MB). Peak memory consumption was 137.7 MB. Max. memory is 7.1 GB. [2018-07-23 19:39:19,565 INFO L168 Benchmark]: TraceAbstraction took 226555.30 ms. Allocated memory was 2.3 GB in the beginning and 4.1 GB in the end (delta: 1.9 GB). Free memory was 2.1 GB in the beginning and 1.8 GB in the end (delta: 283.5 MB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. [2018-07-23 19:39:19,570 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 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 867.01 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: 52.9 MB). Peak memory consumption was 52.9 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 143.84 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.3 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 262.11 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 766.0 MB). Free memory was 1.3 GB in the beginning and 2.2 GB in the end (delta: -868.0 MB). Peak memory consumption was 36.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 3862.50 ms. Allocated memory is still 2.3 GB. Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 137.7 MB). Peak memory consumption was 137.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 226555.30 ms. Allocated memory was 2.3 GB in the beginning and 4.1 GB in the end (delta: 1.9 GB). Free memory was 2.1 GB in the beginning and 1.8 GB in the end (delta: 283.5 MB). Peak memory consumption was 2.1 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 91]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 91). Cancelled while BasicCegarLoop was constructing difference of abstraction (2283states) and interpolant automaton (currently 14 states, 11 states before enhancement), while ReachableStatesComputation was computing reachable states (2805 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 255 locations, 1 error locations. TIMEOUT Result, 226.4s OverallTime, 6 OverallIterations, 4 TraceHistogramMax, 151.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 993 SDtfs, 3796 SDslu, 893 SDs, 0 SdLazy, 5138 SolverSat, 1215 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 103.3s Time, PredicateUnifierStatistics: 6 DeclaredPredicates, 920 GetRequests, 820 SyntacticMatches, 51 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 459 ImplicationChecksByTransitivity, 3.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2283occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 38.0s AbstIntTime, 3 AbstIntIterations, 3 AbstIntStrong, 0.9956074482577508 AbsIntWeakeningRatio, 0.10192525481313704 AbsIntAvgWeakeningVarsNumRemoved, 251.28539071347677 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 5 MinimizatonAttempts, 14 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.7s InterpolantComputationTime, 1153 NumberOfCodeBlocks, 1153 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 1147 ConstructedInterpolants, 0 QuantifiedInterpolants, 3919061 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 3 PerfectInterpolantSequences, 406/891 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/Problem14_label27_false-unreach-call_false-termination.c_svcomp-Reach-64bit-Taipan_Default-old.epf_AutomizerCInline.xml/Csv-Benchmark-0-2018-07-23_19-39-19-583.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/Problem14_label27_false-unreach-call_false-termination.c_svcomp-Reach-64bit-Taipan_Default-old.epf_AutomizerCInline.xml/Csv-TraceAbstractionBenchmarks-0-2018-07-23_19-39-19-583.csv Completed graceful shutdown