/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-VariableLbe.epf -i ../../../trunk/examples/svcomp/pthread-wmm/thin001_tso.oepc.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-b981219 [2020-04-18 02:55:52,500 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-04-18 02:55:52,503 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-04-18 02:55:52,520 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-04-18 02:55:52,521 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-04-18 02:55:52,523 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-04-18 02:55:52,525 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-04-18 02:55:52,537 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-04-18 02:55:52,539 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-04-18 02:55:52,540 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-04-18 02:55:52,542 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-04-18 02:55:52,544 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-04-18 02:55:52,544 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-04-18 02:55:52,547 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-04-18 02:55:52,549 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-04-18 02:55:52,551 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-04-18 02:55:52,553 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-04-18 02:55:52,554 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-04-18 02:55:52,556 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-04-18 02:55:52,561 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-04-18 02:55:52,566 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-04-18 02:55:52,567 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-04-18 02:55:52,570 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-04-18 02:55:52,571 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-04-18 02:55:52,573 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-04-18 02:55:52,573 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-04-18 02:55:52,573 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-04-18 02:55:52,576 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-04-18 02:55:52,578 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-04-18 02:55:52,578 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-04-18 02:55:52,579 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-04-18 02:55:52,579 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-04-18 02:55:52,580 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-04-18 02:55:52,581 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-04-18 02:55:52,582 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-04-18 02:55:52,583 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-04-18 02:55:52,584 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-04-18 02:55:52,584 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-04-18 02:55:52,584 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-04-18 02:55:52,585 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-04-18 02:55:52,588 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-04-18 02:55:52,589 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-VariableLbe.epf [2020-04-18 02:55:52,610 INFO L113 SettingsManager]: Loading preferences was successful [2020-04-18 02:55:52,610 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-04-18 02:55:52,612 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-04-18 02:55:52,612 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-04-18 02:55:52,613 INFO L138 SettingsManager]: * Use SBE=true [2020-04-18 02:55:52,613 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-04-18 02:55:52,613 INFO L138 SettingsManager]: * sizeof long=4 [2020-04-18 02:55:52,613 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-04-18 02:55:52,613 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-04-18 02:55:52,614 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-04-18 02:55:52,615 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-04-18 02:55:52,615 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-04-18 02:55:52,615 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-04-18 02:55:52,615 INFO L138 SettingsManager]: * sizeof long double=12 [2020-04-18 02:55:52,616 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-04-18 02:55:52,616 INFO L138 SettingsManager]: * Use constant arrays=true [2020-04-18 02:55:52,616 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-04-18 02:55:52,616 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-04-18 02:55:52,616 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-04-18 02:55:52,617 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-04-18 02:55:52,617 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-04-18 02:55:52,617 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-04-18 02:55:52,617 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-04-18 02:55:52,617 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-04-18 02:55:52,617 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-04-18 02:55:52,618 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-04-18 02:55:52,618 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-04-18 02:55:52,618 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=VARIABLE_BASED_MOVER_CHECK [2020-04-18 02:55:52,618 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-04-18 02:55:52,618 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-04-18 02:55:52,884 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-04-18 02:55:52,900 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-04-18 02:55:52,905 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-04-18 02:55:52,906 INFO L271 PluginConnector]: Initializing CDTParser... [2020-04-18 02:55:52,907 INFO L275 PluginConnector]: CDTParser initialized [2020-04-18 02:55:52,907 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-wmm/thin001_tso.oepc.i [2020-04-18 02:55:52,967 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a4ff719d/c8e8d3d55a534c34abe8f0fe2877eded/FLAG869bc4086 [2020-04-18 02:55:53,504 INFO L306 CDTParser]: Found 1 translation units. [2020-04-18 02:55:53,506 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-wmm/thin001_tso.oepc.i [2020-04-18 02:55:53,528 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a4ff719d/c8e8d3d55a534c34abe8f0fe2877eded/FLAG869bc4086 [2020-04-18 02:55:53,788 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a4ff719d/c8e8d3d55a534c34abe8f0fe2877eded [2020-04-18 02:55:53,796 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-04-18 02:55:53,813 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2020-04-18 02:55:53,815 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-04-18 02:55:53,815 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-04-18 02:55:53,818 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-04-18 02:55:53,819 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.04 02:55:53" (1/1) ... [2020-04-18 02:55:53,822 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@694972d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:53, skipping insertion in model container [2020-04-18 02:55:53,822 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.04 02:55:53" (1/1) ... [2020-04-18 02:55:53,830 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-04-18 02:55:53,884 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-04-18 02:55:54,463 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-04-18 02:55:54,481 INFO L203 MainTranslator]: Completed pre-run [2020-04-18 02:55:54,532 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-04-18 02:55:54,618 INFO L208 MainTranslator]: Completed translation [2020-04-18 02:55:54,620 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54 WrapperNode [2020-04-18 02:55:54,620 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-04-18 02:55:54,621 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-04-18 02:55:54,621 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-04-18 02:55:54,621 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-04-18 02:55:54,630 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,662 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,691 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-04-18 02:55:54,692 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-04-18 02:55:54,692 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-04-18 02:55:54,693 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-04-18 02:55:54,701 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,701 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,704 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,704 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,711 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,713 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,715 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (1/1) ... [2020-04-18 02:55:54,718 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-04-18 02:55:54,719 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-04-18 02:55:54,719 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-04-18 02:55:54,719 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-04-18 02:55:54,720 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (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 [2020-04-18 02:55:54,778 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-04-18 02:55:54,778 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_begin [2020-04-18 02:55:54,778 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-04-18 02:55:54,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-04-18 02:55:54,778 INFO L130 BoogieDeclarations]: Found specification of procedure P0 [2020-04-18 02:55:54,779 INFO L138 BoogieDeclarations]: Found implementation of procedure P0 [2020-04-18 02:55:54,779 INFO L130 BoogieDeclarations]: Found specification of procedure P1 [2020-04-18 02:55:54,779 INFO L138 BoogieDeclarations]: Found implementation of procedure P1 [2020-04-18 02:55:54,779 INFO L130 BoogieDeclarations]: Found specification of procedure P2 [2020-04-18 02:55:54,779 INFO L138 BoogieDeclarations]: Found implementation of procedure P2 [2020-04-18 02:55:54,779 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_atomic_end [2020-04-18 02:55:54,780 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-04-18 02:55:54,780 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-04-18 02:55:54,782 WARN L205 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2020-04-18 02:55:55,163 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-04-18 02:55:55,164 INFO L295 CfgBuilder]: Removed 8 assume(true) statements. [2020-04-18 02:55:55,168 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.04 02:55:55 BoogieIcfgContainer [2020-04-18 02:55:55,168 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-04-18 02:55:55,169 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-04-18 02:55:55,170 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-04-18 02:55:55,173 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-04-18 02:55:55,173 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.04 02:55:53" (1/3) ... [2020-04-18 02:55:55,174 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d00e556 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.04 02:55:55, skipping insertion in model container [2020-04-18 02:55:55,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.04 02:55:54" (2/3) ... [2020-04-18 02:55:55,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d00e556 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.04 02:55:55, skipping insertion in model container [2020-04-18 02:55:55,175 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.04 02:55:55" (3/3) ... [2020-04-18 02:55:55,177 INFO L109 eAbstractionObserver]: Analyzing ICFG thin001_tso.oepc.i [2020-04-18 02:55:55,187 WARN L146 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2020-04-18 02:55:55,187 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-04-18 02:55:55,195 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-04-18 02:55:55,196 INFO L340 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2020-04-18 02:55:55,222 WARN L315 ript$VariableManager]: TermVariabe |P0Thread1of1ForFork0_#in~arg.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,222 WARN L315 ript$VariableManager]: TermVariabe |P0Thread1of1ForFork0_#in~arg.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,223 WARN L315 ript$VariableManager]: TermVariabe P0Thread1of1ForFork0_~arg.base not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,223 WARN L315 ript$VariableManager]: TermVariabe P0Thread1of1ForFork0_~arg.offset not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,224 WARN L315 ript$VariableManager]: TermVariabe |P0Thread1of1ForFork0_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,224 WARN L315 ript$VariableManager]: TermVariabe |P0Thread1of1ForFork0_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,224 WARN L315 ript$VariableManager]: TermVariabe |P1Thread1of1ForFork1_#in~arg.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,225 WARN L315 ript$VariableManager]: TermVariabe |P1Thread1of1ForFork1_#in~arg.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,225 WARN L315 ript$VariableManager]: TermVariabe P1Thread1of1ForFork1_~arg.offset not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,225 WARN L315 ript$VariableManager]: TermVariabe P1Thread1of1ForFork1_~arg.base not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,226 WARN L315 ript$VariableManager]: TermVariabe |P1Thread1of1ForFork1_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,226 WARN L315 ript$VariableManager]: TermVariabe |P1Thread1of1ForFork1_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,226 WARN L315 ript$VariableManager]: TermVariabe |P2Thread1of1ForFork2_#in~arg.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,227 WARN L315 ript$VariableManager]: TermVariabe |P2Thread1of1ForFork2_#in~arg.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,227 WARN L315 ript$VariableManager]: TermVariabe P2Thread1of1ForFork2_~arg.offset not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,227 WARN L315 ript$VariableManager]: TermVariabe P2Thread1of1ForFork2_~arg.base not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,227 WARN L315 ript$VariableManager]: TermVariabe |P2Thread1of1ForFork2_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,228 WARN L315 ript$VariableManager]: TermVariabe |P2Thread1of1ForFork2_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,232 WARN L315 ript$VariableManager]: TermVariabe |P0Thread1of1ForFork0_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,232 WARN L315 ript$VariableManager]: TermVariabe |P0Thread1of1ForFork0_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,233 WARN L315 ript$VariableManager]: TermVariabe P0Thread1of1ForFork0_~arg.base not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,233 WARN L315 ript$VariableManager]: TermVariabe P0Thread1of1ForFork0_~arg.offset not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,239 WARN L315 ript$VariableManager]: TermVariabe P1Thread1of1ForFork1_~arg.offset not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,239 WARN L315 ript$VariableManager]: TermVariabe |P1Thread1of1ForFork1_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,239 WARN L315 ript$VariableManager]: TermVariabe P1Thread1of1ForFork1_~arg.base not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,240 WARN L315 ript$VariableManager]: TermVariabe |P1Thread1of1ForFork1_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,249 WARN L315 ript$VariableManager]: TermVariabe P2Thread1of1ForFork2_~arg.base not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,249 WARN L315 ript$VariableManager]: TermVariabe P2Thread1of1ForFork2_~arg.offset not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,250 WARN L315 ript$VariableManager]: TermVariabe |P2Thread1of1ForFork2_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,250 WARN L315 ript$VariableManager]: TermVariabe |P2Thread1of1ForFork2_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2020-04-18 02:55:55,273 INFO L251 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2020-04-18 02:55:55,297 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-04-18 02:55:55,297 INFO L376 AbstractCegarLoop]: Hoare is true [2020-04-18 02:55:55,298 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-04-18 02:55:55,298 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-04-18 02:55:55,298 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-04-18 02:55:55,299 INFO L380 AbstractCegarLoop]: Difference is false [2020-04-18 02:55:55,299 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-04-18 02:55:55,299 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-04-18 02:55:55,325 INFO L152 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 79 places, 71 transitions, 157 flow [2020-04-18 02:55:55,328 INFO L71 FinitePrefix]: Start finitePrefix. Operand has 79 places, 71 transitions, 157 flow [2020-04-18 02:55:55,376 INFO L129 PetriNetUnfolder]: 2/68 cut-off events. [2020-04-18 02:55:55,377 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2020-04-18 02:55:55,381 INFO L80 FinitePrefix]: Finished finitePrefix Result has 78 conditions, 68 events. 2/68 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 51 event pairs, 0 based on Foata normal form. 0/65 useless extension candidates. Maximal degree in co-relation 55. Up to 2 conditions per place. [2020-04-18 02:55:55,384 INFO L71 FinitePrefix]: Start finitePrefix. Operand has 79 places, 71 transitions, 157 flow [2020-04-18 02:55:55,404 INFO L129 PetriNetUnfolder]: 2/68 cut-off events. [2020-04-18 02:55:55,405 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2020-04-18 02:55:55,405 INFO L80 FinitePrefix]: Finished finitePrefix Result has 78 conditions, 68 events. 2/68 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 51 event pairs, 0 based on Foata normal form. 0/65 useless extension candidates. Maximal degree in co-relation 55. Up to 2 conditions per place. [2020-04-18 02:55:55,408 INFO L158 etLargeBlockEncoding]: Number of co-enabled transitions 1260 [2020-04-18 02:55:55,409 INFO L182 etLargeBlockEncoding]: Variable Check. [2020-04-18 02:55:56,651 WARN L192 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 51 [2020-04-18 02:55:56,759 INFO L206 etLargeBlockEncoding]: Checked pairs total: 2463 [2020-04-18 02:55:56,759 INFO L214 etLargeBlockEncoding]: Total number of compositions: 57 [2020-04-18 02:55:56,763 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 32 places, 23 transitions, 61 flow [2020-04-18 02:55:56,791 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result 362 states. [2020-04-18 02:55:56,793 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states. [2020-04-18 02:55:56,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-04-18 02:55:56,801 INFO L417 BasicCegarLoop]: Found error trace [2020-04-18 02:55:56,802 INFO L425 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-04-18 02:55:56,802 INFO L427 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-04-18 02:55:56,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-04-18 02:55:56,808 INFO L82 PathProgramCache]: Analyzing trace with hash -691335731, now seen corresponding path program 1 times [2020-04-18 02:55:56,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-04-18 02:55:56,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224180194] [2020-04-18 02:55:56,815 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-04-18 02:55:56,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-04-18 02:55:56,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-04-18 02:55:56,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224180194] [2020-04-18 02:55:56,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-04-18 02:55:56,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-04-18 02:55:56,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302501848] [2020-04-18 02:55:56,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-04-18 02:55:56,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-04-18 02:55:56,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-04-18 02:55:56,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-04-18 02:55:57,001 INFO L87 Difference]: Start difference. First operand 362 states. Second operand 2 states. [2020-04-18 02:55:57,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-04-18 02:55:57,045 INFO L93 Difference]: Finished difference Result 362 states and 1072 transitions. [2020-04-18 02:55:57,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-04-18 02:55:57,047 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 8 [2020-04-18 02:55:57,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-04-18 02:55:57,066 INFO L225 Difference]: With dead ends: 362 [2020-04-18 02:55:57,066 INFO L226 Difference]: Without dead ends: 298 [2020-04-18 02:55:57,069 INFO L678 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 [2020-04-18 02:55:57,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-04-18 02:55:57,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 298. [2020-04-18 02:55:57,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2020-04-18 02:55:57,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 864 transitions. [2020-04-18 02:55:57,139 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 864 transitions. Word has length 8 [2020-04-18 02:55:57,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-04-18 02:55:57,140 INFO L479 AbstractCegarLoop]: Abstraction has 298 states and 864 transitions. [2020-04-18 02:55:57,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-04-18 02:55:57,141 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 864 transitions. [2020-04-18 02:55:57,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-04-18 02:55:57,142 INFO L417 BasicCegarLoop]: Found error trace [2020-04-18 02:55:57,142 INFO L425 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-04-18 02:55:57,143 INFO L427 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-04-18 02:55:57,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-04-18 02:55:57,143 INFO L82 PathProgramCache]: Analyzing trace with hash 43425274, now seen corresponding path program 1 times [2020-04-18 02:55:57,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-04-18 02:55:57,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644932252] [2020-04-18 02:55:57,144 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-04-18 02:55:57,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-04-18 02:55:57,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-04-18 02:55:57,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644932252] [2020-04-18 02:55:57,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-04-18 02:55:57,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-04-18 02:55:57,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045015597] [2020-04-18 02:55:57,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-04-18 02:55:57,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-04-18 02:55:57,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-04-18 02:55:57,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-04-18 02:55:57,287 INFO L87 Difference]: Start difference. First operand 298 states and 864 transitions. Second operand 4 states. [2020-04-18 02:55:57,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-04-18 02:55:57,333 INFO L93 Difference]: Finished difference Result 330 states and 912 transitions. [2020-04-18 02:55:57,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-04-18 02:55:57,334 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-04-18 02:55:57,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-04-18 02:55:57,339 INFO L225 Difference]: With dead ends: 330 [2020-04-18 02:55:57,340 INFO L226 Difference]: Without dead ends: 266 [2020-04-18 02:55:57,342 INFO L678 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-04-18 02:55:57,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2020-04-18 02:55:57,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 266. [2020-04-18 02:55:57,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 266 states. [2020-04-18 02:55:57,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 752 transitions. [2020-04-18 02:55:57,381 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 752 transitions. Word has length 9 [2020-04-18 02:55:57,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-04-18 02:55:57,381 INFO L479 AbstractCegarLoop]: Abstraction has 266 states and 752 transitions. [2020-04-18 02:55:57,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-04-18 02:55:57,382 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 752 transitions. [2020-04-18 02:55:57,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-04-18 02:55:57,383 INFO L417 BasicCegarLoop]: Found error trace [2020-04-18 02:55:57,383 INFO L425 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-04-18 02:55:57,384 INFO L427 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-04-18 02:55:57,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-04-18 02:55:57,384 INFO L82 PathProgramCache]: Analyzing trace with hash 1345064228, now seen corresponding path program 1 times [2020-04-18 02:55:57,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-04-18 02:55:57,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522868314] [2020-04-18 02:55:57,385 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-04-18 02:55:57,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-04-18 02:55:57,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-04-18 02:55:57,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522868314] [2020-04-18 02:55:57,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-04-18 02:55:57,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-04-18 02:55:57,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000805646] [2020-04-18 02:55:57,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-04-18 02:55:57,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-04-18 02:55:57,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-04-18 02:55:57,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-04-18 02:55:57,503 INFO L87 Difference]: Start difference. First operand 266 states and 752 transitions. Second operand 4 states. [2020-04-18 02:55:57,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-04-18 02:55:57,525 INFO L93 Difference]: Finished difference Result 290 states and 786 transitions. [2020-04-18 02:55:57,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-04-18 02:55:57,526 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2020-04-18 02:55:57,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-04-18 02:55:57,528 INFO L225 Difference]: With dead ends: 290 [2020-04-18 02:55:57,528 INFO L226 Difference]: Without dead ends: 242 [2020-04-18 02:55:57,529 INFO L678 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-04-18 02:55:57,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2020-04-18 02:55:57,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 242. [2020-04-18 02:55:57,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-04-18 02:55:57,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 670 transitions. [2020-04-18 02:55:57,541 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 670 transitions. Word has length 10 [2020-04-18 02:55:57,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-04-18 02:55:57,542 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 670 transitions. [2020-04-18 02:55:57,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-04-18 02:55:57,542 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 670 transitions. [2020-04-18 02:55:57,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-04-18 02:55:57,544 INFO L417 BasicCegarLoop]: Found error trace [2020-04-18 02:55:57,544 INFO L425 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-04-18 02:55:57,544 INFO L427 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-04-18 02:55:57,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-04-18 02:55:57,545 INFO L82 PathProgramCache]: Analyzing trace with hash 1654538757, now seen corresponding path program 1 times [2020-04-18 02:55:57,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-04-18 02:55:57,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059302018] [2020-04-18 02:55:57,545 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-04-18 02:55:57,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-04-18 02:55:57,609 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-04-18 02:55:57,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059302018] [2020-04-18 02:55:57,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-04-18 02:55:57,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-04-18 02:55:57,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837659130] [2020-04-18 02:55:57,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-04-18 02:55:57,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-04-18 02:55:57,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-04-18 02:55:57,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-04-18 02:55:57,615 INFO L87 Difference]: Start difference. First operand 242 states and 670 transitions. Second operand 5 states. [2020-04-18 02:55:57,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-04-18 02:55:57,678 INFO L93 Difference]: Finished difference Result 290 states and 777 transitions. [2020-04-18 02:55:57,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-04-18 02:55:57,679 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-04-18 02:55:57,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-04-18 02:55:57,680 INFO L225 Difference]: With dead ends: 290 [2020-04-18 02:55:57,680 INFO L226 Difference]: Without dead ends: 158 [2020-04-18 02:55:57,681 INFO L678 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-04-18 02:55:57,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-04-18 02:55:57,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2020-04-18 02:55:57,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-04-18 02:55:57,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 394 transitions. [2020-04-18 02:55:57,689 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 394 transitions. Word has length 11 [2020-04-18 02:55:57,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-04-18 02:55:57,689 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 394 transitions. [2020-04-18 02:55:57,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-04-18 02:55:57,689 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 394 transitions. [2020-04-18 02:55:57,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-04-18 02:55:57,691 INFO L417 BasicCegarLoop]: Found error trace [2020-04-18 02:55:57,691 INFO L425 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-04-18 02:55:57,691 INFO L427 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-04-18 02:55:57,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-04-18 02:55:57,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1491329578, now seen corresponding path program 1 times [2020-04-18 02:55:57,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-04-18 02:55:57,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708983999] [2020-04-18 02:55:57,692 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-04-18 02:55:57,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-04-18 02:55:57,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-04-18 02:55:57,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708983999] [2020-04-18 02:55:57,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-04-18 02:55:57,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-04-18 02:55:57,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114291356] [2020-04-18 02:55:57,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-04-18 02:55:57,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-04-18 02:55:57,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-04-18 02:55:57,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-04-18 02:55:57,778 INFO L87 Difference]: Start difference. First operand 158 states and 394 transitions. Second operand 5 states. [2020-04-18 02:55:57,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-04-18 02:55:57,837 INFO L93 Difference]: Finished difference Result 212 states and 513 transitions. [2020-04-18 02:55:57,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-04-18 02:55:57,840 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-04-18 02:55:57,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-04-18 02:55:57,842 INFO L225 Difference]: With dead ends: 212 [2020-04-18 02:55:57,842 INFO L226 Difference]: Without dead ends: 98 [2020-04-18 02:55:57,842 INFO L678 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-04-18 02:55:57,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-04-18 02:55:57,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-04-18 02:55:57,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-04-18 02:55:57,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 218 transitions. [2020-04-18 02:55:57,852 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 218 transitions. Word has length 13 [2020-04-18 02:55:57,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-04-18 02:55:57,853 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 218 transitions. [2020-04-18 02:55:57,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-04-18 02:55:57,853 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 218 transitions. [2020-04-18 02:55:57,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-04-18 02:55:57,854 INFO L417 BasicCegarLoop]: Found error trace [2020-04-18 02:55:57,854 INFO L425 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-04-18 02:55:57,854 INFO L427 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-04-18 02:55:57,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-04-18 02:55:57,855 INFO L82 PathProgramCache]: Analyzing trace with hash -647415272, now seen corresponding path program 1 times [2020-04-18 02:55:57,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-04-18 02:55:57,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637608875] [2020-04-18 02:55:57,860 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-04-18 02:55:57,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-04-18 02:55:57,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-04-18 02:55:57,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637608875] [2020-04-18 02:55:57,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-04-18 02:55:57,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-04-18 02:55:57,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483431264] [2020-04-18 02:55:57,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-04-18 02:55:57,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-04-18 02:55:57,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-04-18 02:55:57,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-04-18 02:55:57,951 INFO L87 Difference]: Start difference. First operand 98 states and 218 transitions. Second operand 5 states. [2020-04-18 02:55:57,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-04-18 02:55:57,990 INFO L93 Difference]: Finished difference Result 86 states and 186 transitions. [2020-04-18 02:55:57,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-04-18 02:55:57,990 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-04-18 02:55:57,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-04-18 02:55:57,991 INFO L225 Difference]: With dead ends: 86 [2020-04-18 02:55:57,991 INFO L226 Difference]: Without dead ends: 0 [2020-04-18 02:55:57,991 INFO L678 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-04-18 02:55:57,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-04-18 02:55:57,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-04-18 02:55:57,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-04-18 02:55:57,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-04-18 02:55:57,993 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 14 [2020-04-18 02:55:57,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-04-18 02:55:57,993 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-04-18 02:55:57,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-04-18 02:55:57,994 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-04-18 02:55:57,994 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-04-18 02:55:58,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.04 02:55:57 BasicIcfg [2020-04-18 02:55:58,000 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-04-18 02:55:58,004 INFO L168 Benchmark]: Toolchain (without parser) took 4204.11 ms. Allocated memory was 144.7 MB in the beginning and 246.9 MB in the end (delta: 102.2 MB). Free memory was 101.3 MB in the beginning and 117.5 MB in the end (delta: -16.3 MB). Peak memory consumption was 86.0 MB. Max. memory is 7.1 GB. [2020-04-18 02:55:58,005 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 144.7 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-04-18 02:55:58,010 INFO L168 Benchmark]: CACSL2BoogieTranslator took 805.90 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 99.2 MB in the beginning and 157.0 MB in the end (delta: -57.8 MB). Peak memory consumption was 20.5 MB. Max. memory is 7.1 GB. [2020-04-18 02:55:58,011 INFO L168 Benchmark]: Boogie Procedure Inliner took 70.87 ms. Allocated memory is still 201.9 MB. Free memory was 157.0 MB in the beginning and 154.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. [2020-04-18 02:55:58,012 INFO L168 Benchmark]: Boogie Preprocessor took 26.82 ms. Allocated memory is still 201.9 MB. Free memory was 154.3 MB in the beginning and 152.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-04-18 02:55:58,013 INFO L168 Benchmark]: RCFGBuilder took 449.16 ms. Allocated memory is still 201.9 MB. Free memory was 152.9 MB in the beginning and 130.4 MB in the end (delta: 22.5 MB). Peak memory consumption was 22.5 MB. Max. memory is 7.1 GB. [2020-04-18 02:55:58,013 INFO L168 Benchmark]: TraceAbstraction took 2830.81 ms. Allocated memory was 201.9 MB in the beginning and 246.9 MB in the end (delta: 45.1 MB). Free memory was 130.4 MB in the beginning and 117.5 MB in the end (delta: 12.9 MB). Peak memory consumption was 58.0 MB. Max. memory is 7.1 GB. [2020-04-18 02:55:58,022 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 144.7 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 805.90 ms. Allocated memory was 144.7 MB in the beginning and 201.9 MB in the end (delta: 57.1 MB). Free memory was 99.2 MB in the beginning and 157.0 MB in the end (delta: -57.8 MB). Peak memory consumption was 20.5 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 70.87 ms. Allocated memory is still 201.9 MB. Free memory was 157.0 MB in the beginning and 154.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.82 ms. Allocated memory is still 201.9 MB. Free memory was 154.3 MB in the beginning and 152.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 449.16 ms. Allocated memory is still 201.9 MB. Free memory was 152.9 MB in the beginning and 130.4 MB in the end (delta: 22.5 MB). Peak memory consumption was 22.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2830.81 ms. Allocated memory was 201.9 MB in the beginning and 246.9 MB in the end (delta: 45.1 MB). Free memory was 130.4 MB in the beginning and 117.5 MB in the end (delta: 12.9 MB). Peak memory consumption was 58.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks LbeTime: 1.4s, 79 ProgramPointsBefore, 32 ProgramPointsAfterwards, 71 TransitionsBefore, 23 TransitionsAfterwards, 1260 CoEnabledTransitionPairs, 6 FixpointIterations, 15 TrivialSequentialCompositions, 32 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 10 ConcurrentYvCompositions, 1 ChoiceCompositions, 668 VarBasedMoverChecksPositive, 20 VarBasedMoverChecksNegative, 0 SemBasedMoverChecksPositive, 0 SemBasedMoverChecksNegative, 0 SemBasedMoverChecksUnknown, SemBasedMoverCheckTime: 0.0s, 0 MoverChecksTotal, 2463 CheckedPairsTotal, 57 TotalNumberOfCompositions - PositiveResult [Line: 7]: 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 - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 70 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 2.7s, OverallIterations: 6, TraceHistogramMax: 1, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 1.4s, HoareTripleCheckerStatistics: 133 SDtfs, 141 SDslu, 178 SDs, 0 SdLazy, 40 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 26 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=362occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 65 NumberOfCodeBlocks, 65 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 59 ConstructedInterpolants, 0 QuantifiedInterpolants, 1775 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 6 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...