./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loop-acceleration/nested_true-unreach-call1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loop-acceleration/nested_true-unreach-call1.i -s /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/config/svcomp-Reach-32bit-PetriAutomizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a5caa00ae79e87f00b53813a39ed64b4be57c6c3 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-5842f4b [2018-11-18 17:06:42,584 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 17:06:42,585 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 17:06:42,592 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 17:06:42,592 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 17:06:42,593 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 17:06:42,593 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 17:06:42,595 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 17:06:42,596 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 17:06:42,596 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 17:06:42,597 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 17:06:42,597 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 17:06:42,598 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 17:06:42,598 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 17:06:42,599 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 17:06:42,600 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 17:06:42,600 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 17:06:42,601 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 17:06:42,603 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 17:06:42,604 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 17:06:42,604 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 17:06:42,605 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 17:06:42,607 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 17:06:42,607 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 17:06:42,607 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 17:06:42,608 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 17:06:42,608 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 17:06:42,609 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 17:06:42,609 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 17:06:42,610 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 17:06:42,610 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 17:06:42,611 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 17:06:42,611 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 17:06:42,611 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 17:06:42,612 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 17:06:42,612 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 17:06:42,612 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/config/svcomp-Reach-32bit-PetriAutomizer_Default.epf [2018-11-18 17:06:42,622 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 17:06:42,623 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 17:06:42,623 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 17:06:42,623 INFO L133 SettingsManager]: * Process only entry and re-entry procedures=false [2018-11-18 17:06:42,624 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-11-18 17:06:42,624 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-11-18 17:06:42,624 INFO L133 SettingsManager]: * Use SBE=true [2018-11-18 17:06:42,625 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 17:06:42,625 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 17:06:42,625 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 17:06:42,625 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 17:06:42,625 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 17:06:42,625 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 17:06:42,625 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 17:06:42,625 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 17:06:42,626 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 17:06:42,626 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 17:06:42,626 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 17:06:42,626 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 17:06:42,626 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 17:06:42,626 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 17:06:42,626 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 17:06:42,627 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 17:06:42,627 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 17:06:42,627 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 17:06:42,627 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 17:06:42,627 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 17:06:42,627 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-11-18 17:06:42,627 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 17:06:42,627 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 17:06:42,628 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a5caa00ae79e87f00b53813a39ed64b4be57c6c3 [2018-11-18 17:06:42,649 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 17:06:42,656 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 17:06:42,658 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 17:06:42,659 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 17:06:42,659 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 17:06:42,659 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/../../sv-benchmarks/c/loop-acceleration/nested_true-unreach-call1.i [2018-11-18 17:06:42,694 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/data/72e9b66ed/62472bc11e0247408595e496b78cf8f0/FLAG2e7c8b3f5 [2018-11-18 17:06:43,098 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 17:06:43,098 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/sv-benchmarks/c/loop-acceleration/nested_true-unreach-call1.i [2018-11-18 17:06:43,102 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/data/72e9b66ed/62472bc11e0247408595e496b78cf8f0/FLAG2e7c8b3f5 [2018-11-18 17:06:43,110 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/data/72e9b66ed/62472bc11e0247408595e496b78cf8f0 [2018-11-18 17:06:43,113 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 17:06:43,114 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-18 17:06:43,114 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 17:06:43,115 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 17:06:43,117 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 17:06:43,118 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,120 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@617ec0df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43, skipping insertion in model container [2018-11-18 17:06:43,120 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,128 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 17:06:43,143 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 17:06:43,255 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 17:06:43,257 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 17:06:43,266 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 17:06:43,273 INFO L195 MainTranslator]: Completed translation [2018-11-18 17:06:43,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43 WrapperNode [2018-11-18 17:06:43,274 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 17:06:43,274 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 17:06:43,274 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 17:06:43,274 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 17:06:43,281 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,282 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,284 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,285 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,286 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,289 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,290 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (1/1) ... [2018-11-18 17:06:43,290 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 17:06:43,291 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 17:06:43,291 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 17:06:43,291 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 17:06:43,291 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/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 [2018-11-18 17:06:43,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 17:06:43,360 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 17:06:43,360 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-18 17:06:43,360 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 17:06:43,360 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-11-18 17:06:43,360 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-18 17:06:43,360 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 17:06:43,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 17:06:43,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 17:06:43,456 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 17:06:43,456 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 05:06:43 BoogieIcfgContainer [2018-11-18 17:06:43,457 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 17:06:43,457 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 17:06:43,457 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 17:06:43,459 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 17:06:43,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 05:06:43" (1/3) ... [2018-11-18 17:06:43,459 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@480fc2d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 05:06:43, skipping insertion in model container [2018-11-18 17:06:43,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 05:06:43" (2/3) ... [2018-11-18 17:06:43,460 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@480fc2d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 05:06:43, skipping insertion in model container [2018-11-18 17:06:43,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 05:06:43" (3/3) ... [2018-11-18 17:06:43,461 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_true-unreach-call1.i [2018-11-18 17:06:43,467 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 17:06:43,471 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-18 17:06:43,479 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-18 17:06:43,498 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-11-18 17:06:43,498 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 17:06:43,499 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 17:06:43,499 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 17:06:43,499 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 17:06:43,499 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 17:06:43,499 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 17:06:43,499 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 17:06:43,499 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 17:06:43,511 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-18 17:06:43,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-18 17:06:43,514 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 17:06:43,515 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 17:06:43,516 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 17:06:43,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 17:06:43,520 INFO L82 PathProgramCache]: Analyzing trace with hash -283544510, now seen corresponding path program 1 times [2018-11-18 17:06:43,521 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 17:06:43,521 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 17:06:43,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:43,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 17:06:43,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:43,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 17:06:43,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 17:06:43,588 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 17:06:43,589 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-18 17:06:43,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-18 17:06:43,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-18 17:06:43,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 17:06:43,600 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-18 17:06:43,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 17:06:43,617 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2018-11-18 17:06:43,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-18 17:06:43,618 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-18 17:06:43,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 17:06:43,624 INFO L225 Difference]: With dead ends: 37 [2018-11-18 17:06:43,624 INFO L226 Difference]: Without dead ends: 15 [2018-11-18 17:06:43,627 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-18 17:06:43,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-11-18 17:06:43,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-11-18 17:06:43,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-11-18 17:06:43,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-11-18 17:06:43,652 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2018-11-18 17:06:43,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 17:06:43,652 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-11-18 17:06:43,652 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-18 17:06:43,652 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-11-18 17:06:43,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-18 17:06:43,653 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 17:06:43,653 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 17:06:43,653 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 17:06:43,653 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 17:06:43,653 INFO L82 PathProgramCache]: Analyzing trace with hash -863512858, now seen corresponding path program 1 times [2018-11-18 17:06:43,653 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 17:06:43,653 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 17:06:43,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:43,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 17:06:43,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:43,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 17:06:43,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 17:06:43,722 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 17:06:43,722 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 17:06:43,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-18 17:06:43,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-18 17:06:43,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 17:06:43,723 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 3 states. [2018-11-18 17:06:43,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 17:06:43,734 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2018-11-18 17:06:43,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-18 17:06:43,735 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-18 17:06:43,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 17:06:43,735 INFO L225 Difference]: With dead ends: 25 [2018-11-18 17:06:43,735 INFO L226 Difference]: Without dead ends: 20 [2018-11-18 17:06:43,736 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 17:06:43,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-11-18 17:06:43,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2018-11-18 17:06:43,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-18 17:06:43,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-11-18 17:06:43,739 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-11-18 17:06:43,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 17:06:43,740 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-11-18 17:06:43,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-18 17:06:43,740 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-11-18 17:06:43,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-18 17:06:43,740 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 17:06:43,741 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 17:06:43,741 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 17:06:43,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 17:06:43,741 INFO L82 PathProgramCache]: Analyzing trace with hash -1427803270, now seen corresponding path program 1 times [2018-11-18 17:06:43,741 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 17:06:43,741 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 17:06:43,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:43,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 17:06:43,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:43,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 17:06:43,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 17:06:43,823 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 17:06:43,823 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-18 17:06:43,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-18 17:06:43,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-18 17:06:43,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 17:06:43,824 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 3 states. [2018-11-18 17:06:43,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 17:06:43,838 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-11-18 17:06:43,840 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-18 17:06:43,840 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2018-11-18 17:06:43,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 17:06:43,840 INFO L225 Difference]: With dead ends: 29 [2018-11-18 17:06:43,840 INFO L226 Difference]: Without dead ends: 19 [2018-11-18 17:06:43,841 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-18 17:06:43,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-18 17:06:43,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-11-18 17:06:43,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-18 17:06:43,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-11-18 17:06:43,846 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2018-11-18 17:06:43,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 17:06:43,846 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-11-18 17:06:43,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-18 17:06:43,846 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-11-18 17:06:43,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-18 17:06:43,846 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 17:06:43,846 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 17:06:43,846 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 17:06:43,847 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 17:06:43,847 INFO L82 PathProgramCache]: Analyzing trace with hash 1523179828, now seen corresponding path program 1 times [2018-11-18 17:06:43,847 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 17:06:43,847 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 17:06:43,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:43,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 17:06:43,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:43,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 17:06:43,897 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 17:06:43,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 17:06:43,897 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 17:06:43,915 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 17:06:43,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 17:06:43,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 17:06:43,976 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 17:06:43,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 17:06:43,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 7 [2018-11-18 17:06:43,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 17:06:43,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 17:06:43,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-11-18 17:06:43,993 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 7 states. [2018-11-18 17:06:44,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 17:06:44,087 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2018-11-18 17:06:44,088 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-18 17:06:44,088 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2018-11-18 17:06:44,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 17:06:44,088 INFO L225 Difference]: With dead ends: 49 [2018-11-18 17:06:44,088 INFO L226 Difference]: Without dead ends: 37 [2018-11-18 17:06:44,089 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2018-11-18 17:06:44,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-18 17:06:44,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2018-11-18 17:06:44,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-18 17:06:44,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-11-18 17:06:44,092 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 18 [2018-11-18 17:06:44,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 17:06:44,093 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-11-18 17:06:44,093 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 17:06:44,093 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-11-18 17:06:44,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-18 17:06:44,093 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 17:06:44,093 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 17:06:44,094 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 17:06:44,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 17:06:44,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1070919706, now seen corresponding path program 2 times [2018-11-18 17:06:44,094 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 17:06:44,094 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 17:06:44,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:44,095 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 17:06:44,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:44,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 17:06:44,148 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-18 17:06:44,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 17:06:44,148 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 17:06:44,154 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-11-18 17:06:44,163 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-11-18 17:06:44,163 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 17:06:44,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 17:06:44,188 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-11-18 17:06:44,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-11-18 17:06:44,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2018-11-18 17:06:44,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-18 17:06:44,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-18 17:06:44,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-11-18 17:06:44,214 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 8 states. [2018-11-18 17:06:44,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 17:06:44,360 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2018-11-18 17:06:44,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-18 17:06:44,361 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2018-11-18 17:06:44,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 17:06:44,362 INFO L225 Difference]: With dead ends: 71 [2018-11-18 17:06:44,362 INFO L226 Difference]: Without dead ends: 54 [2018-11-18 17:06:44,362 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2018-11-18 17:06:44,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-18 17:06:44,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2018-11-18 17:06:44,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-18 17:06:44,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-11-18 17:06:44,371 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 29 [2018-11-18 17:06:44,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 17:06:44,371 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-11-18 17:06:44,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-18 17:06:44,371 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-11-18 17:06:44,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-18 17:06:44,372 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 17:06:44,372 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 17:06:44,373 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 17:06:44,373 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 17:06:44,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1068904040, now seen corresponding path program 3 times [2018-11-18 17:06:44,373 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-11-18 17:06:44,373 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-11-18 17:06:44,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:44,374 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-18 17:06:44,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 17:06:44,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 17:06:44,480 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-11-18 17:06:44,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-18 17:06:44,480 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-18 17:06:44,489 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-18 17:06:44,504 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-18 17:06:44,504 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-18 17:06:44,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-18 17:06:49,415 WARN L180 SmtUtils]: Spent 667.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 19 [2018-11-18 17:06:53,498 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2018-11-18 17:06:53,522 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-11-18 17:06:53,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 11 [2018-11-18 17:06:53,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-18 17:06:53,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-18 17:06:53,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=84, Unknown=3, NotChecked=0, Total=110 [2018-11-18 17:06:53,524 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 11 states. [2018-11-18 17:06:59,447 WARN L180 SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2018-11-18 17:06:59,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 17:06:59,448 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2018-11-18 17:06:59,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-18 17:06:59,448 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 44 [2018-11-18 17:06:59,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 17:06:59,448 INFO L225 Difference]: With dead ends: 79 [2018-11-18 17:06:59,448 INFO L226 Difference]: Without dead ends: 0 [2018-11-18 17:06:59,449 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=90, Invalid=326, Unknown=4, NotChecked=0, Total=420 [2018-11-18 17:06:59,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-11-18 17:06:59,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-11-18 17:06:59,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-11-18 17:06:59,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-11-18 17:06:59,450 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 44 [2018-11-18 17:06:59,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 17:06:59,450 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-11-18 17:06:59,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-18 17:06:59,450 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-11-18 17:06:59,450 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-11-18 17:06:59,454 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-11-18 17:06:59,548 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-11-18 17:06:59,549 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-11-18 17:06:59,549 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-11-18 17:06:59,549 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-11-18 17:06:59,549 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-11-18 17:06:59,549 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-11-18 17:06:59,549 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 8 19) no Hoare annotation was computed. [2018-11-18 17:06:59,549 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 8 19) no Hoare annotation was computed. [2018-11-18 17:06:59,549 INFO L425 ceAbstractionStarter]: For program point L13-1(lines 13 15) no Hoare annotation was computed. [2018-11-18 17:06:59,550 INFO L425 ceAbstractionStarter]: For program point L11-1(lines 11 17) no Hoare annotation was computed. [2018-11-18 17:06:59,550 INFO L421 ceAbstractionStarter]: At program point L13-3(lines 13 15) the Hoare annotation is: (or (= main_~x~0 0) (and (< (mod (+ main_~x~0 4294967295) 4294967296) 268435455) (< (mod main_~x~0 4294967296) 268435455))) [2018-11-18 17:06:59,550 INFO L425 ceAbstractionStarter]: For program point L13-4(lines 13 15) no Hoare annotation was computed. [2018-11-18 17:06:59,552 INFO L421 ceAbstractionStarter]: At program point L11-3(lines 11 17) the Hoare annotation is: (or (< (mod (+ main_~x~0 4294967295) 4294967296) 268435455) (and (<= 0 main_~y~0) (<= main_~x~0 0) (<= 0 main_~x~0) (<= main_~y~0 0))) [2018-11-18 17:06:59,552 INFO L421 ceAbstractionStarter]: At program point L11-4(lines 11 17) the Hoare annotation is: (and (< (mod (+ main_~x~0 4294967295) 4294967296) 268435455) (<= 268435455 (mod main_~x~0 4294967296))) [2018-11-18 17:06:59,552 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 8 19) the Hoare annotation is: true [2018-11-18 17:06:59,553 INFO L425 ceAbstractionStarter]: For program point L3-2(lines 2 7) no Hoare annotation was computed. [2018-11-18 17:06:59,553 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 2 7) the Hoare annotation is: true [2018-11-18 17:06:59,553 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 2 7) no Hoare annotation was computed. [2018-11-18 17:06:59,553 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 4) no Hoare annotation was computed. [2018-11-18 17:06:59,553 INFO L425 ceAbstractionStarter]: For program point L4(line 4) no Hoare annotation was computed. [2018-11-18 17:06:59,553 INFO L425 ceAbstractionStarter]: For program point L3(lines 3 5) no Hoare annotation was computed. [2018-11-18 17:06:59,563 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 05:06:59 BoogieIcfgContainer [2018-11-18 17:06:59,564 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 17:06:59,564 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 17:06:59,564 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 17:06:59,564 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 17:06:59,565 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 05:06:43" (3/4) ... [2018-11-18 17:06:59,567 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-11-18 17:06:59,571 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-11-18 17:06:59,571 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-11-18 17:06:59,572 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-11-18 17:06:59,574 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 11 nodes and edges [2018-11-18 17:06:59,574 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2018-11-18 17:06:59,574 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-11-18 17:06:59,601 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_d82ef487-8541-4b48-a358-26229ac9c03b/bin-2019/uautomizer/witness.graphml [2018-11-18 17:06:59,601 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 17:06:59,601 INFO L168 Benchmark]: Toolchain (without parser) took 16488.26 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 169.9 MB). Free memory was 958.4 MB in the beginning and 959.4 MB in the end (delta: -1.0 MB). Peak memory consumption was 168.9 MB. Max. memory is 11.5 GB. [2018-11-18 17:06:59,602 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 985.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 17:06:59,602 INFO L168 Benchmark]: CACSL2BoogieTranslator took 159.59 ms. Allocated memory is still 1.0 GB. Free memory was 958.4 MB in the beginning and 947.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. [2018-11-18 17:06:59,603 INFO L168 Benchmark]: Boogie Preprocessor took 16.15 ms. Allocated memory is still 1.0 GB. Free memory was 947.6 MB in the beginning and 944.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 17:06:59,603 INFO L168 Benchmark]: RCFGBuilder took 166.03 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 169.9 MB). Free memory was 944.9 MB in the beginning and 1.2 GB in the end (delta: -211.9 MB). Peak memory consumption was 20.6 MB. Max. memory is 11.5 GB. [2018-11-18 17:06:59,604 INFO L168 Benchmark]: TraceAbstraction took 16106.76 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 962.6 MB in the end (delta: 194.1 MB). Peak memory consumption was 194.1 MB. Max. memory is 11.5 GB. [2018-11-18 17:06:59,604 INFO L168 Benchmark]: Witness Printer took 36.74 ms. Allocated memory is still 1.2 GB. Free memory was 962.6 MB in the beginning and 959.4 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 11.5 GB. [2018-11-18 17:06:59,606 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 985.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 159.59 ms. Allocated memory is still 1.0 GB. Free memory was 958.4 MB in the beginning and 947.6 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 16.15 ms. Allocated memory is still 1.0 GB. Free memory was 947.6 MB in the beginning and 944.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 166.03 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 169.9 MB). Free memory was 944.9 MB in the beginning and 1.2 GB in the end (delta: -211.9 MB). Peak memory consumption was 20.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 16106.76 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 962.6 MB in the end (delta: 194.1 MB). Peak memory consumption was 194.1 MB. Max. memory is 11.5 GB. * Witness Printer took 36.74 ms. Allocated memory is still 1.2 GB. Free memory was 962.6 MB in the beginning and 959.4 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 4]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: (x + 4294967295) % 4294967296 < 268435455 || (((0 <= y && x <= 0) && 0 <= x) && y <= 0) - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: x == 0 || ((x + 4294967295) % 4294967296 < 268435455 && x % 4294967296 < 268435455) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. SAFE Result, 16.0s OverallTime, 6 OverallIterations, 12 TraceHistogramMax, 6.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 105 SDtfs, 34 SDslu, 253 SDs, 0 SdLazy, 208 SolverSat, 32 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 135 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 14.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=45occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 19 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 14 PreInvPairs, 34 NumberOfFragments, 56 HoareAnnotationTreeSize, 14 FomulaSimplifications, 492 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 17 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 9.3s InterpolantComputationTime, 219 NumberOfCodeBlocks, 191 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 210 ConstructedInterpolants, 2 QuantifiedInterpolants, 17284 SizeOfPredicates, 5 NumberOfNonLiveVariables, 127 ConjunctsInSsa, 26 ConjunctsInUnsatCore, 9 InterpolantComputations, 4 PerfectInterpolantSequences, 329/378 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...