/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-ext/17_szymanski.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-4336eb1 [2019-12-27 04:49:42,167 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-27 04:49:42,171 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-27 04:49:42,189 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-27 04:49:42,189 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-27 04:49:42,191 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-27 04:49:42,193 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-27 04:49:42,199 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-27 04:49:42,202 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-27 04:49:42,204 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-27 04:49:42,204 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-27 04:49:42,207 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-27 04:49:42,208 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-27 04:49:42,209 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-27 04:49:42,212 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-27 04:49:42,213 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-27 04:49:42,215 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-27 04:49:42,216 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-27 04:49:42,218 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-27 04:49:42,223 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-27 04:49:42,227 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-27 04:49:42,231 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-27 04:49:42,232 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-27 04:49:42,233 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-27 04:49:42,235 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-12-27 04:49:42,240 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-27 04:49:42,242 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-27 04:49:42,243 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-27 04:49:42,243 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-27 04:49:42,244 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-27 04:49:42,244 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-27 04:49:42,245 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-27 04:49:42,245 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-27 04:49:42,245 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-27 04:49:42,246 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-27 04:49:42,247 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-27 04:49:42,247 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 [2019-12-27 04:49:42,261 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-27 04:49:42,261 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-27 04:49:42,262 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-12-27 04:49:42,263 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-12-27 04:49:42,263 INFO L138 SettingsManager]: * Use SBE=true [2019-12-27 04:49:42,263 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-27 04:49:42,263 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-27 04:49:42,263 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-27 04:49:42,264 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-27 04:49:42,264 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-27 04:49:42,264 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-27 04:49:42,264 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-27 04:49:42,264 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-27 04:49:42,265 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-27 04:49:42,265 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-27 04:49:42,265 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-27 04:49:42,265 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-27 04:49:42,265 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-27 04:49:42,266 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-12-27 04:49:42,266 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-27 04:49:42,266 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-27 04:49:42,266 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-27 04:49:42,266 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-27 04:49:42,267 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-27 04:49:42,267 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-27 04:49:42,267 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-12-27 04:49:42,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-27 04:49:42,267 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=VARIABLE_BASED_MOVER_CHECK [2019-12-27 04:49:42,268 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-27 04:49:42,268 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-27 04:49:42,550 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-27 04:49:42,563 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-27 04:49:42,566 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-27 04:49:42,568 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-27 04:49:42,568 INFO L275 PluginConnector]: CDTParser initialized [2019-12-27 04:49:42,569 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/pthread-ext/17_szymanski.i [2019-12-27 04:49:42,643 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23c6c42c1/c992b676654f4e29a713445fae029060/FLAGa67258b77 [2019-12-27 04:49:43,215 INFO L306 CDTParser]: Found 1 translation units. [2019-12-27 04:49:43,217 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/pthread-ext/17_szymanski.i [2019-12-27 04:49:43,235 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23c6c42c1/c992b676654f4e29a713445fae029060/FLAGa67258b77 [2019-12-27 04:49:43,539 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23c6c42c1/c992b676654f4e29a713445fae029060 [2019-12-27 04:49:43,549 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-27 04:49:43,551 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-12-27 04:49:43,552 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-27 04:49:43,552 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-27 04:49:43,556 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-27 04:49:43,557 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 04:49:43" (1/1) ... [2019-12-27 04:49:43,560 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4fe163cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:43, skipping insertion in model container [2019-12-27 04:49:43,560 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.12 04:49:43" (1/1) ... [2019-12-27 04:49:43,568 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-27 04:49:43,613 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-27 04:49:44,026 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-27 04:49:44,038 INFO L203 MainTranslator]: Completed pre-run [2019-12-27 04:49:44,083 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-27 04:49:44,150 INFO L208 MainTranslator]: Completed translation [2019-12-27 04:49:44,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44 WrapperNode [2019-12-27 04:49:44,151 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-27 04:49:44,152 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-27 04:49:44,152 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-27 04:49:44,152 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-27 04:49:44,161 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,177 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,199 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-27 04:49:44,200 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-27 04:49:44,200 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-27 04:49:44,200 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-27 04:49:44,210 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,210 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,213 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,213 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,218 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,225 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,227 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (1/1) ... [2019-12-27 04:49:44,230 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-27 04:49:44,231 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-27 04:49:44,231 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-27 04:49:44,231 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-27 04:49:44,232 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (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 [2019-12-27 04:49:44,298 INFO L130 BoogieDeclarations]: Found specification of procedure thr1 [2019-12-27 04:49:44,298 INFO L138 BoogieDeclarations]: Found implementation of procedure thr1 [2019-12-27 04:49:44,299 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-27 04:49:44,299 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-12-27 04:49:44,299 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-12-27 04:49:44,299 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-27 04:49:44,299 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-27 04:49:44,301 WARN L205 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2019-12-27 04:49:44,685 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-27 04:49:44,686 INFO L287 CfgBuilder]: Removed 16 assume(true) statements. [2019-12-27 04:49:44,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 04:49:44 BoogieIcfgContainer [2019-12-27 04:49:44,687 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-27 04:49:44,688 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-27 04:49:44,688 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-27 04:49:44,691 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-27 04:49:44,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.12 04:49:43" (1/3) ... [2019-12-27 04:49:44,692 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cf3f87a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 04:49:44, skipping insertion in model container [2019-12-27 04:49:44,692 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.12 04:49:44" (2/3) ... [2019-12-27 04:49:44,693 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cf3f87a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.12 04:49:44, skipping insertion in model container [2019-12-27 04:49:44,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.12 04:49:44" (3/3) ... [2019-12-27 04:49:44,695 INFO L109 eAbstractionObserver]: Analyzing ICFG 17_szymanski.i [2019-12-27 04:49:44,704 WARN L145 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2019-12-27 04:49:44,704 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-27 04:49:44,710 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2019-12-27 04:49:44,711 INFO L340 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2019-12-27 04:49:44,733 WARN L315 ript$VariableManager]: TermVariabe |thr1Thread1of1ForFork0_#in~arg.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,734 WARN L315 ript$VariableManager]: TermVariabe |thr1Thread1of1ForFork0_#in~arg.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,734 WARN L315 ript$VariableManager]: TermVariabe thr1Thread1of1ForFork0_~arg.offset not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,734 WARN L315 ript$VariableManager]: TermVariabe thr1Thread1of1ForFork0_~arg.base not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,735 WARN L315 ript$VariableManager]: TermVariabe |thr1Thread1of1ForFork0_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,735 WARN L315 ript$VariableManager]: TermVariabe |thr1Thread1of1ForFork0_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,740 WARN L315 ript$VariableManager]: TermVariabe |thr1Thread1of1ForFork0_#res.base| not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,740 WARN L315 ript$VariableManager]: TermVariabe thr1Thread1of1ForFork0_~arg.offset not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,741 WARN L315 ript$VariableManager]: TermVariabe thr1Thread1of1ForFork0_~arg.base not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,741 WARN L315 ript$VariableManager]: TermVariabe |thr1Thread1of1ForFork0_#res.offset| not constructed by VariableManager. Cannot ensure absence of name clashes. [2019-12-27 04:49:44,764 INFO L249 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2019-12-27 04:49:44,782 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-27 04:49:44,782 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-27 04:49:44,782 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-27 04:49:44,782 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-27 04:49:44,782 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-27 04:49:44,783 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-27 04:49:44,783 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-27 04:49:44,783 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-27 04:49:44,797 INFO L152 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 62 places, 82 transitions [2019-12-27 04:49:44,799 INFO L68 FinitePrefix]: Start finitePrefix. Operand has 62 places, 82 transitions [2019-12-27 04:49:44,851 INFO L132 PetriNetUnfolder]: 24/81 cut-off events. [2019-12-27 04:49:44,852 INFO L133 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2019-12-27 04:49:44,861 INFO L76 FinitePrefix]: Finished finitePrefix Result has 85 conditions, 81 events. 24/81 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 134 event pairs. 0/55 useless extension candidates. Maximal degree in co-relation 70. Up to 3 conditions per place. [2019-12-27 04:49:44,867 INFO L68 FinitePrefix]: Start finitePrefix. Operand has 62 places, 82 transitions [2019-12-27 04:49:44,894 INFO L132 PetriNetUnfolder]: 24/81 cut-off events. [2019-12-27 04:49:44,894 INFO L133 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2019-12-27 04:49:44,897 INFO L76 FinitePrefix]: Finished finitePrefix Result has 85 conditions, 81 events. 24/81 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 134 event pairs. 0/55 useless extension candidates. Maximal degree in co-relation 70. Up to 3 conditions per place. [2019-12-27 04:49:44,902 INFO L158 etLargeBlockEncoding]: Number of co-enabled transitions 2400 [2019-12-27 04:49:44,903 INFO L182 etLargeBlockEncoding]: Variable Check. [2019-12-27 04:49:45,640 INFO L206 etLargeBlockEncoding]: Checked pairs total: 4373 [2019-12-27 04:49:45,640 INFO L214 etLargeBlockEncoding]: Total number of compositions: 39 [2019-12-27 04:49:45,644 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 33 places, 51 transitions [2019-12-27 04:49:45,674 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result 227 states. [2019-12-27 04:49:45,676 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states. [2019-12-27 04:49:45,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-12-27 04:49:45,697 INFO L403 BasicCegarLoop]: Found error trace [2019-12-27 04:49:45,698 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-27 04:49:45,699 INFO L410 AbstractCegarLoop]: === Iteration 1 === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-27 04:49:45,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-27 04:49:45,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1558311805, now seen corresponding path program 1 times [2019-12-27 04:49:45,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-27 04:49:45,721 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341078088] [2019-12-27 04:49:45,721 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-27 04:49:45,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-27 04:49:45,946 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-27 04:49:45,947 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341078088] [2019-12-27 04:49:45,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-27 04:49:45,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-27 04:49:45,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971747631] [2019-12-27 04:49:45,954 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-12-27 04:49:45,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-27 04:49:45,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-12-27 04:49:45,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-27 04:49:45,971 INFO L87 Difference]: Start difference. First operand 227 states. Second operand 2 states. [2019-12-27 04:49:45,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-27 04:49:45,999 INFO L93 Difference]: Finished difference Result 198 states and 534 transitions. [2019-12-27 04:49:45,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-27 04:49:46,000 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2019-12-27 04:49:46,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-27 04:49:46,017 INFO L225 Difference]: With dead ends: 198 [2019-12-27 04:49:46,017 INFO L226 Difference]: Without dead ends: 198 [2019-12-27 04:49:46,019 INFO L631 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 [2019-12-27 04:49:46,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2019-12-27 04:49:46,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2019-12-27 04:49:46,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2019-12-27 04:49:46,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 534 transitions. [2019-12-27 04:49:46,088 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 534 transitions. Word has length 9 [2019-12-27 04:49:46,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-27 04:49:46,088 INFO L462 AbstractCegarLoop]: Abstraction has 198 states and 534 transitions. [2019-12-27 04:49:46,088 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-12-27 04:49:46,089 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 534 transitions. [2019-12-27 04:49:46,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-12-27 04:49:46,090 INFO L403 BasicCegarLoop]: Found error trace [2019-12-27 04:49:46,090 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-27 04:49:46,090 INFO L410 AbstractCegarLoop]: === Iteration 2 === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-27 04:49:46,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-27 04:49:46,091 INFO L82 PathProgramCache]: Analyzing trace with hash 1031484476, now seen corresponding path program 1 times [2019-12-27 04:49:46,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-27 04:49:46,091 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414408958] [2019-12-27 04:49:46,091 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-27 04:49:46,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-27 04:49:46,170 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-27 04:49:46,171 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414408958] [2019-12-27 04:49:46,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-27 04:49:46,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-27 04:49:46,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32147081] [2019-12-27 04:49:46,173 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-27 04:49:46,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-27 04:49:46,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-27 04:49:46,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-27 04:49:46,174 INFO L87 Difference]: Start difference. First operand 198 states and 534 transitions. Second operand 3 states. [2019-12-27 04:49:46,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-27 04:49:46,208 INFO L93 Difference]: Finished difference Result 362 states and 979 transitions. [2019-12-27 04:49:46,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-27 04:49:46,209 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-12-27 04:49:46,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-27 04:49:46,214 INFO L225 Difference]: With dead ends: 362 [2019-12-27 04:49:46,214 INFO L226 Difference]: Without dead ends: 362 [2019-12-27 04:49:46,215 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-27 04:49:46,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2019-12-27 04:49:46,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 221. [2019-12-27 04:49:46,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 221 states. [2019-12-27 04:49:46,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 589 transitions. [2019-12-27 04:49:46,241 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 589 transitions. Word has length 11 [2019-12-27 04:49:46,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-27 04:49:46,241 INFO L462 AbstractCegarLoop]: Abstraction has 221 states and 589 transitions. [2019-12-27 04:49:46,241 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-27 04:49:46,242 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 589 transitions. [2019-12-27 04:49:46,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-12-27 04:49:46,243 INFO L403 BasicCegarLoop]: Found error trace [2019-12-27 04:49:46,243 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-27 04:49:46,243 INFO L410 AbstractCegarLoop]: === Iteration 3 === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-27 04:49:46,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-27 04:49:46,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1746695160, now seen corresponding path program 1 times [2019-12-27 04:49:46,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-27 04:49:46,244 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417276531] [2019-12-27 04:49:46,244 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-27 04:49:46,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-27 04:49:46,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-27 04:49:46,294 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417276531] [2019-12-27 04:49:46,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-27 04:49:46,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-27 04:49:46,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836981554] [2019-12-27 04:49:46,295 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-27 04:49:46,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-27 04:49:46,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-27 04:49:46,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-27 04:49:46,296 INFO L87 Difference]: Start difference. First operand 221 states and 589 transitions. Second operand 3 states. [2019-12-27 04:49:46,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-27 04:49:46,315 INFO L93 Difference]: Finished difference Result 348 states and 934 transitions. [2019-12-27 04:49:46,316 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-27 04:49:46,316 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-12-27 04:49:46,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-27 04:49:46,320 INFO L225 Difference]: With dead ends: 348 [2019-12-27 04:49:46,320 INFO L226 Difference]: Without dead ends: 348 [2019-12-27 04:49:46,320 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-27 04:49:46,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2019-12-27 04:49:46,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 218. [2019-12-27 04:49:46,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2019-12-27 04:49:46,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 560 transitions. [2019-12-27 04:49:46,347 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 560 transitions. Word has length 11 [2019-12-27 04:49:46,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-27 04:49:46,347 INFO L462 AbstractCegarLoop]: Abstraction has 218 states and 560 transitions. [2019-12-27 04:49:46,347 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-27 04:49:46,347 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 560 transitions. [2019-12-27 04:49:46,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-12-27 04:49:46,353 INFO L403 BasicCegarLoop]: Found error trace [2019-12-27 04:49:46,353 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-27 04:49:46,354 INFO L410 AbstractCegarLoop]: === Iteration 4 === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-27 04:49:46,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-27 04:49:46,354 INFO L82 PathProgramCache]: Analyzing trace with hash -1652537164, now seen corresponding path program 1 times [2019-12-27 04:49:46,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-27 04:49:46,356 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518302300] [2019-12-27 04:49:46,356 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-27 04:49:46,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-27 04:49:46,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-27 04:49:46,418 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518302300] [2019-12-27 04:49:46,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-27 04:49:46,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-12-27 04:49:46,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659844658] [2019-12-27 04:49:46,420 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-27 04:49:46,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-27 04:49:46,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-27 04:49:46,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-27 04:49:46,420 INFO L87 Difference]: Start difference. First operand 218 states and 560 transitions. Second operand 3 states. [2019-12-27 04:49:46,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-27 04:49:46,470 INFO L93 Difference]: Finished difference Result 220 states and 542 transitions. [2019-12-27 04:49:46,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-27 04:49:46,470 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-12-27 04:49:46,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-27 04:49:46,472 INFO L225 Difference]: With dead ends: 220 [2019-12-27 04:49:46,472 INFO L226 Difference]: Without dead ends: 220 [2019-12-27 04:49:46,473 INFO L631 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 [2019-12-27 04:49:46,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2019-12-27 04:49:46,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 220. [2019-12-27 04:49:46,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2019-12-27 04:49:46,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 542 transitions. [2019-12-27 04:49:46,484 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 542 transitions. Word has length 19 [2019-12-27 04:49:46,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-27 04:49:46,485 INFO L462 AbstractCegarLoop]: Abstraction has 220 states and 542 transitions. [2019-12-27 04:49:46,485 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-27 04:49:46,485 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 542 transitions. [2019-12-27 04:49:46,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-12-27 04:49:46,487 INFO L403 BasicCegarLoop]: Found error trace [2019-12-27 04:49:46,487 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-27 04:49:46,487 INFO L410 AbstractCegarLoop]: === Iteration 5 === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-27 04:49:46,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-27 04:49:46,488 INFO L82 PathProgramCache]: Analyzing trace with hash 952506058, now seen corresponding path program 1 times [2019-12-27 04:49:46,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-27 04:49:46,488 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890103658] [2019-12-27 04:49:46,488 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-27 04:49:46,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-27 04:49:46,515 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-27 04:49:46,516 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890103658] [2019-12-27 04:49:46,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-27 04:49:46,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-12-27 04:49:46,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533856511] [2019-12-27 04:49:46,517 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-27 04:49:46,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-27 04:49:46,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-27 04:49:46,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-27 04:49:46,517 INFO L87 Difference]: Start difference. First operand 220 states and 542 transitions. Second operand 3 states. [2019-12-27 04:49:46,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-27 04:49:46,563 INFO L93 Difference]: Finished difference Result 240 states and 579 transitions. [2019-12-27 04:49:46,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-27 04:49:46,563 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-12-27 04:49:46,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-27 04:49:46,565 INFO L225 Difference]: With dead ends: 240 [2019-12-27 04:49:46,566 INFO L226 Difference]: Without dead ends: 240 [2019-12-27 04:49:46,566 INFO L631 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 [2019-12-27 04:49:46,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2019-12-27 04:49:46,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 230. [2019-12-27 04:49:46,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2019-12-27 04:49:46,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 557 transitions. [2019-12-27 04:49:46,576 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 557 transitions. Word has length 19 [2019-12-27 04:49:46,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-27 04:49:46,577 INFO L462 AbstractCegarLoop]: Abstraction has 230 states and 557 transitions. [2019-12-27 04:49:46,577 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-27 04:49:46,577 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 557 transitions. [2019-12-27 04:49:46,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-12-27 04:49:46,578 INFO L403 BasicCegarLoop]: Found error trace [2019-12-27 04:49:46,578 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-27 04:49:46,579 INFO L410 AbstractCegarLoop]: === Iteration 6 === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-27 04:49:46,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-27 04:49:46,579 INFO L82 PathProgramCache]: Analyzing trace with hash -687819132, now seen corresponding path program 2 times [2019-12-27 04:49:46,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-27 04:49:46,580 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474572094] [2019-12-27 04:49:46,580 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-27 04:49:46,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-27 04:49:46,609 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-27 04:49:46,609 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474572094] [2019-12-27 04:49:46,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-27 04:49:46,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-12-27 04:49:46,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714009591] [2019-12-27 04:49:46,611 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-27 04:49:46,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-27 04:49:46,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-27 04:49:46,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-27 04:49:46,612 INFO L87 Difference]: Start difference. First operand 230 states and 557 transitions. Second operand 3 states. [2019-12-27 04:49:46,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-27 04:49:46,683 INFO L93 Difference]: Finished difference Result 228 states and 541 transitions. [2019-12-27 04:49:46,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-27 04:49:46,684 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-12-27 04:49:46,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-27 04:49:46,686 INFO L225 Difference]: With dead ends: 228 [2019-12-27 04:49:46,687 INFO L226 Difference]: Without dead ends: 228 [2019-12-27 04:49:46,687 INFO L631 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 [2019-12-27 04:49:46,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2019-12-27 04:49:46,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 228. [2019-12-27 04:49:46,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 228 states. [2019-12-27 04:49:46,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 541 transitions. [2019-12-27 04:49:46,697 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 541 transitions. Word has length 19 [2019-12-27 04:49:46,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-27 04:49:46,697 INFO L462 AbstractCegarLoop]: Abstraction has 228 states and 541 transitions. [2019-12-27 04:49:46,697 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-27 04:49:46,697 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 541 transitions. [2019-12-27 04:49:46,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-12-27 04:49:46,698 INFO L403 BasicCegarLoop]: Found error trace [2019-12-27 04:49:46,699 INFO L411 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-27 04:49:46,699 INFO L410 AbstractCegarLoop]: === Iteration 7 === [thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, thr1Err0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-27 04:49:46,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-27 04:49:46,699 INFO L82 PathProgramCache]: Analyzing trace with hash -36638496, now seen corresponding path program 3 times [2019-12-27 04:49:46,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-12-27 04:49:46,700 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364448122] [2019-12-27 04:49:46,700 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-27 04:49:46,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-27 04:49:46,732 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-27 04:49:46,732 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364448122] [2019-12-27 04:49:46,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-27 04:49:46,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-12-27 04:49:46,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133064955] [2019-12-27 04:49:46,734 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-12-27 04:49:46,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-12-27 04:49:46,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-12-27 04:49:46,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-12-27 04:49:46,735 INFO L87 Difference]: Start difference. First operand 228 states and 541 transitions. Second operand 3 states. [2019-12-27 04:49:46,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-27 04:49:46,772 INFO L93 Difference]: Finished difference Result 194 states and 456 transitions. [2019-12-27 04:49:46,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-12-27 04:49:46,789 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2019-12-27 04:49:46,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-27 04:49:46,789 INFO L225 Difference]: With dead ends: 194 [2019-12-27 04:49:46,789 INFO L226 Difference]: Without dead ends: 0 [2019-12-27 04:49:46,790 INFO L631 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 [2019-12-27 04:49:46,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-12-27 04:49:46,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-12-27 04:49:46,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-12-27 04:49:46,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-12-27 04:49:46,792 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 19 [2019-12-27 04:49:46,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-27 04:49:46,792 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-12-27 04:49:46,792 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-12-27 04:49:46,792 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-12-27 04:49:46,792 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-12-27 04:49:46,796 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.12 04:49:46 BasicIcfg [2019-12-27 04:49:46,796 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-27 04:49:46,799 INFO L168 Benchmark]: Toolchain (without parser) took 3247.61 ms. Allocated memory was 137.4 MB in the beginning and 250.6 MB in the end (delta: 113.2 MB). Free memory was 100.5 MB in the beginning and 217.7 MB in the end (delta: -117.2 MB). Peak memory consumption was 119.6 MB. Max. memory is 7.1 GB. [2019-12-27 04:49:46,800 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 137.4 MB. Free memory is still 120.2 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-12-27 04:49:46,801 INFO L168 Benchmark]: CACSL2BoogieTranslator took 598.98 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 100.1 MB in the beginning and 160.9 MB in the end (delta: -60.8 MB). Peak memory consumption was 25.5 MB. Max. memory is 7.1 GB. [2019-12-27 04:49:46,801 INFO L168 Benchmark]: Boogie Procedure Inliner took 47.98 ms. Allocated memory is still 201.3 MB. Free memory was 160.9 MB in the beginning and 159.0 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. [2019-12-27 04:49:46,802 INFO L168 Benchmark]: Boogie Preprocessor took 30.92 ms. Allocated memory is still 201.3 MB. Free memory was 159.0 MB in the beginning and 157.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. [2019-12-27 04:49:46,803 INFO L168 Benchmark]: RCFGBuilder took 455.81 ms. Allocated memory is still 201.3 MB. Free memory was 157.0 MB in the beginning and 136.2 MB in the end (delta: 20.8 MB). Peak memory consumption was 20.8 MB. Max. memory is 7.1 GB. [2019-12-27 04:49:46,804 INFO L168 Benchmark]: TraceAbstraction took 2108.80 ms. Allocated memory was 201.3 MB in the beginning and 250.6 MB in the end (delta: 49.3 MB). Free memory was 135.2 MB in the beginning and 217.7 MB in the end (delta: -82.5 MB). Peak memory consumption was 90.3 MB. Max. memory is 7.1 GB. [2019-12-27 04:49:46,808 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 137.4 MB. Free memory is still 120.2 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 598.98 ms. Allocated memory was 137.4 MB in the beginning and 201.3 MB in the end (delta: 64.0 MB). Free memory was 100.1 MB in the beginning and 160.9 MB in the end (delta: -60.8 MB). Peak memory consumption was 25.5 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 47.98 ms. Allocated memory is still 201.3 MB. Free memory was 160.9 MB in the beginning and 159.0 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.92 ms. Allocated memory is still 201.3 MB. Free memory was 159.0 MB in the beginning and 157.0 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 455.81 ms. Allocated memory is still 201.3 MB. Free memory was 157.0 MB in the beginning and 136.2 MB in the end (delta: 20.8 MB). Peak memory consumption was 20.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2108.80 ms. Allocated memory was 201.3 MB in the beginning and 250.6 MB in the end (delta: 49.3 MB). Free memory was 135.2 MB in the beginning and 217.7 MB in the end (delta: -82.5 MB). Peak memory consumption was 90.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks LbeTime: 0.8s, 62 ProgramPointsBefore, 33 ProgramPointsAfterwards, 82 TransitionsBefore, 51 TransitionsAfterwards, 2400 CoEnabledTransitionPairs, 5 FixpointIterations, 9 TrivialSequentialCompositions, 18 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 12 ConcurrentYvCompositions, 4 ChoiceCompositions, 1006 VarBasedMoverChecksPositive, 37 VarBasedMoverChecksNegative, 0 SemBasedMoverChecksPositive, 0 SemBasedMoverChecksNegative, 0 SemBasedMoverChecksUnknown, SemBasedMoverCheckTime: 0.0s, 0 MoverChecksTotal, 4373 CheckedPairsTotal, 39 TotalNumberOfCompositions - PositiveResult [Line: 687]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - PositiveResult [Line: 705]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 2 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 59 locations, 2 error locations. Result: SAFE, OverallTime: 2.0s, OverallIterations: 7, TraceHistogramMax: 1, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 373 SDtfs, 152 SDslu, 134 SDs, 0 SdLazy, 98 SolverSat, 24 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=230occurred in iteration=5, 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, 7 MinimizatonAttempts, 281 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 107 NumberOfCodeBlocks, 107 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 100 ConstructedInterpolants, 0 QuantifiedInterpolants, 2248 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 7 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...