/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-RepeatedSemanticLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/example_unnecessary_interleavings.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-25 17:48:02,506 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-25 17:48:02,509 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-25 17:48:02,544 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-25 17:48:02,562 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-25 17:48:02,564 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-25 17:48:02,565 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-25 17:48:02,566 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-25 17:48:02,568 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-25 17:48:02,569 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-25 17:48:02,571 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-25 17:48:02,579 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-25 17:48:02,580 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-25 17:48:02,581 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-25 17:48:02,582 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-25 17:48:02,583 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-25 17:48:02,589 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-03-25 17:48:02,596 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-25 17:48:02,596 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-25 17:48:02,597 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-25 17:48:02,597 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-PN-RepeatedSemanticLbe.epf [2021-03-25 17:48:02,631 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-25 17:48:02,631 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-25 17:48:02,634 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-25 17:48:02,634 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-25 17:48:02,635 INFO L138 SettingsManager]: * Use SBE=true [2021-03-25 17:48:02,635 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-25 17:48:02,635 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-25 17:48:02,635 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-25 17:48:02,635 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-25 17:48:02,635 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-25 17:48:02,636 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-25 17:48:02,636 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-25 17:48:02,636 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-25 17:48:02,636 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-25 17:48:02,637 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-25 17:48:02,637 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-25 17:48:02,637 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-25 17:48:02,637 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-25 17:48:02,637 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-25 17:48:02,637 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-25 17:48:02,637 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-25 17:48:02,638 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-25 17:48:02,638 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-25 17:48:02,638 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-25 17:48:02,638 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-25 17:48:02,638 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-25 17:48:02,638 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-25 17:48:02,638 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-25 17:48:02,638 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-03-25 17:48:02,639 INFO L138 SettingsManager]: * Apply repeated Lipton Reduction=true WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-25 17:48:02,955 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-25 17:48:02,979 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-25 17:48:02,981 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-25 17:48:02,982 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-25 17:48:02,983 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-25 17:48:02,983 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/example_unnecessary_interleavings.bpl [2021-03-25 17:48:02,984 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/example_unnecessary_interleavings.bpl' [2021-03-25 17:48:03,012 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-25 17:48:03,013 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-25 17:48:03,014 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-25 17:48:03,014 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-25 17:48:03,014 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-25 17:48:03,025 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,031 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,038 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-25 17:48:03,039 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-25 17:48:03,040 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-25 17:48:03,040 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-25 17:48:03,046 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,047 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,047 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,047 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,049 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,049 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,049 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/1) ... [2021-03-25 17:48:03,050 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-25 17:48:03,051 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-25 17:48:03,051 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-25 17:48:03,051 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-25 17:48:03,056 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (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 [2021-03-25 17:48:03,121 INFO L124 BoogieDeclarations]: Specification and implementation of procedure set_y given in one single declaration [2021-03-25 17:48:03,122 INFO L130 BoogieDeclarations]: Found specification of procedure set_y [2021-03-25 17:48:03,122 INFO L138 BoogieDeclarations]: Found implementation of procedure set_y [2021-03-25 17:48:03,122 INFO L124 BoogieDeclarations]: Specification and implementation of procedure set_z given in one single declaration [2021-03-25 17:48:03,122 INFO L130 BoogieDeclarations]: Found specification of procedure set_z [2021-03-25 17:48:03,122 INFO L138 BoogieDeclarations]: Found implementation of procedure set_z [2021-03-25 17:48:03,122 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-25 17:48:03,122 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-25 17:48:03,123 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-25 17:48:03,123 INFO L124 BoogieDeclarations]: Specification and implementation of procedure set_x given in one single declaration [2021-03-25 17:48:03,123 INFO L130 BoogieDeclarations]: Found specification of procedure set_x [2021-03-25 17:48:03,123 INFO L138 BoogieDeclarations]: Found implementation of procedure set_x [2021-03-25 17:48:03,124 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-25 17:48:03,222 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-25 17:48:03,223 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-25 17:48:03,224 INFO L202 PluginConnector]: Adding new model example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 05:48:03 BoogieIcfgContainer [2021-03-25 17:48:03,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-25 17:48:03,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-25 17:48:03,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-25 17:48:03,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-25 17:48:03,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:03" (1/2) ... [2021-03-25 17:48:03,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17cd2308 and model type example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.03 05:48:03, skipping insertion in model container [2021-03-25 17:48:03,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 05:48:03" (2/2) ... [2021-03-25 17:48:03,230 INFO L111 eAbstractionObserver]: Analyzing ICFG example_unnecessary_interleavings.bpl [2021-03-25 17:48:03,235 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-25 17:48:03,238 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-25 17:48:03,238 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-25 17:48:03,278 INFO L149 ThreadInstanceAdder]: Constructed 9 joinOtherThreadTransitions. [2021-03-25 17:48:03,304 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-25 17:48:03,341 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:48:03,341 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:48:03,342 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:48:03,342 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:48:03,342 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:48:03,342 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:48:03,342 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:48:03,342 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:48:03,353 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 25 transitions, 92 flow [2021-03-25 17:48:03,388 INFO L129 PetriNetUnfolder]: 5/25 cut-off events. [2021-03-25 17:48:03,389 INFO L130 PetriNetUnfolder]: For 12/12 co-relation queries the response was YES. [2021-03-25 17:48:03,391 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47 conditions, 25 events. 5/25 cut-off events. For 12/12 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 33 event pairs, 0 based on Foata normal form. 0/24 useless extension candidates. Maximal degree in co-relation 20. Up to 6 conditions per place. [2021-03-25 17:48:03,392 INFO L82 GeneralOperation]: Start removeDead. Operand has 29 places, 25 transitions, 92 flow [2021-03-25 17:48:03,395 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 20 transitions, 76 flow [2021-03-25 17:48:03,396 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:48:03,408 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 24 places, 20 transitions, 76 flow [2021-03-25 17:48:03,411 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 24 places, 20 transitions, 76 flow [2021-03-25 17:48:03,412 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 20 transitions, 76 flow [2021-03-25 17:48:03,431 INFO L129 PetriNetUnfolder]: 5/23 cut-off events. [2021-03-25 17:48:03,432 INFO L130 PetriNetUnfolder]: For 12/12 co-relation queries the response was YES. [2021-03-25 17:48:03,432 INFO L84 FinitePrefix]: Finished finitePrefix Result has 45 conditions, 23 events. 5/23 cut-off events. For 12/12 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 36 event pairs, 0 based on Foata normal form. 0/23 useless extension candidates. Maximal degree in co-relation 20. Up to 6 conditions per place. [2021-03-25 17:48:03,434 INFO L142 LiptonReduction]: Number of co-enabled transitions 84 [2021-03-25 17:48:03,478 INFO L154 LiptonReduction]: Checked pairs total: 27 [2021-03-25 17:48:03,478 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-25 17:48:03,480 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 85 [2021-03-25 17:48:03,496 INFO L129 PetriNetUnfolder]: 5/19 cut-off events. [2021-03-25 17:48:03,496 INFO L130 PetriNetUnfolder]: For 12/12 co-relation queries the response was YES. [2021-03-25 17:48:03,496 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:48:03,497 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:48:03,497 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:48:03,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:48:03,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1687139461, now seen corresponding path program 1 times [2021-03-25 17:48:03,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:48:03,509 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575237730] [2021-03-25 17:48:03,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:48:03,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:48:03,596 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:48:03,597 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 17:48:03,606 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:48:03,606 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:48:03,613 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:48:03,613 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 17:48:03,614 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:48:03,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575237730] [2021-03-25 17:48:03,615 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:48:03,616 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-25 17:48:03,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384063740] [2021-03-25 17:48:03,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:48:03,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:48:03,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:48:03,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:48:03,635 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 28 [2021-03-25 17:48:03,636 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 21 places, 17 transitions, 70 flow. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,637 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:48:03,637 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 28 [2021-03-25 17:48:03,638 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:48:03,650 INFO L129 PetriNetUnfolder]: 1/13 cut-off events. [2021-03-25 17:48:03,650 INFO L130 PetriNetUnfolder]: For 17/17 co-relation queries the response was YES. [2021-03-25 17:48:03,651 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 13 events. 1/13 cut-off events. For 17/17 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 9 event pairs, 0 based on Foata normal form. 3/16 useless extension candidates. Maximal degree in co-relation 11. Up to 3 conditions per place. [2021-03-25 17:48:03,652 INFO L132 encePairwiseOnDemand]: 25/28 looper letters, 1 selfloop transitions, 1 changer transitions 0/13 dead transitions. [2021-03-25 17:48:03,652 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 13 transitions, 54 flow [2021-03-25 17:48:03,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:48:03,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:48:03,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 76 transitions. [2021-03-25 17:48:03,661 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.9047619047619048 [2021-03-25 17:48:03,661 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 76 transitions. [2021-03-25 17:48:03,662 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 76 transitions. [2021-03-25 17:48:03,662 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:48:03,664 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 76 transitions. [2021-03-25 17:48:03,666 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 25.333333333333332) internal successors, (76), 3 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,669 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,669 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,670 INFO L185 Difference]: Start difference. First operand has 21 places, 17 transitions, 70 flow. Second operand 3 states and 76 transitions. [2021-03-25 17:48:03,671 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 13 transitions, 54 flow [2021-03-25 17:48:03,673 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 17 places, 13 transitions, 38 flow, removed 0 selfloop flow, removed 6 redundant places. [2021-03-25 17:48:03,675 INFO L241 Difference]: Finished difference. Result has 17 places, 13 transitions, 36 flow [2021-03-25 17:48:03,676 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=28, PETRI_DIFFERENCE_MINUEND_FLOW=34, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=36, PETRI_PLACES=17, PETRI_TRANSITIONS=13} [2021-03-25 17:48:03,677 INFO L343 CegarLoopForPetriNet]: 21 programPoint places, -4 predicate places. [2021-03-25 17:48:03,677 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:48:03,677 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 17 places, 13 transitions, 36 flow [2021-03-25 17:48:03,677 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 17 places, 13 transitions, 36 flow [2021-03-25 17:48:03,678 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 17 places, 13 transitions, 36 flow [2021-03-25 17:48:03,681 INFO L129 PetriNetUnfolder]: 1/13 cut-off events. [2021-03-25 17:48:03,682 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:48:03,682 INFO L84 FinitePrefix]: Finished finitePrefix Result has 19 conditions, 13 events. 1/13 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 9 event pairs, 0 based on Foata normal form. 0/13 useless extension candidates. Maximal degree in co-relation 9. Up to 2 conditions per place. [2021-03-25 17:48:03,682 INFO L142 LiptonReduction]: Number of co-enabled transitions 24 [2021-03-25 17:48:03,683 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:48:03,683 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:48:03,683 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-03-25 17:48:03,684 INFO L480 AbstractCegarLoop]: Abstraction has has 17 places, 13 transitions, 36 flow [2021-03-25 17:48:03,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,685 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:48:03,685 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:48:03,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-25 17:48:03,685 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:48:03,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:48:03,686 INFO L82 PathProgramCache]: Analyzing trace with hash -1436662561, now seen corresponding path program 1 times [2021-03-25 17:48:03,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:48:03,686 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989687312] [2021-03-25 17:48:03,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:48:03,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:48:03,699 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:48:03,699 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 17:48:03,700 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:48:03,700 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:48:03,704 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:48:03,704 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 17:48:03,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:48:03,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989687312] [2021-03-25 17:48:03,705 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:48:03,705 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-25 17:48:03,705 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249521779] [2021-03-25 17:48:03,706 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:48:03,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:48:03,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:48:03,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:48:03,708 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 28 [2021-03-25 17:48:03,708 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 17 places, 13 transitions, 36 flow. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,708 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:48:03,708 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 28 [2021-03-25 17:48:03,708 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:48:03,713 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-25 17:48:03,713 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-25 17:48:03,714 INFO L84 FinitePrefix]: Finished finitePrefix Result has 20 conditions, 11 events. 0/11 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 7 event pairs, 0 based on Foata normal form. 1/12 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-25 17:48:03,714 INFO L132 encePairwiseOnDemand]: 26/28 looper letters, 1 selfloop transitions, 1 changer transitions 0/11 dead transitions. [2021-03-25 17:48:03,714 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 19 places, 11 transitions, 34 flow [2021-03-25 17:48:03,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:48:03,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:48:03,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 75 transitions. [2021-03-25 17:48:03,716 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.8928571428571429 [2021-03-25 17:48:03,716 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 75 transitions. [2021-03-25 17:48:03,716 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 75 transitions. [2021-03-25 17:48:03,716 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:48:03,716 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 75 transitions. [2021-03-25 17:48:03,717 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,718 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,718 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,718 INFO L185 Difference]: Start difference. First operand has 17 places, 13 transitions, 36 flow. Second operand 3 states and 75 transitions. [2021-03-25 17:48:03,718 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 19 places, 11 transitions, 34 flow [2021-03-25 17:48:03,718 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 18 places, 11 transitions, 33 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-25 17:48:03,719 INFO L241 Difference]: Finished difference. Result has 18 places, 11 transitions, 31 flow [2021-03-25 17:48:03,719 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=28, PETRI_DIFFERENCE_MINUEND_FLOW=29, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=31, PETRI_PLACES=18, PETRI_TRANSITIONS=11} [2021-03-25 17:48:03,720 INFO L343 CegarLoopForPetriNet]: 21 programPoint places, -3 predicate places. [2021-03-25 17:48:03,720 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:48:03,720 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 18 places, 11 transitions, 31 flow [2021-03-25 17:48:03,720 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 18 places, 11 transitions, 31 flow [2021-03-25 17:48:03,721 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 18 places, 11 transitions, 31 flow [2021-03-25 17:48:03,723 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-25 17:48:03,724 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:48:03,724 INFO L84 FinitePrefix]: Finished finitePrefix Result has 18 conditions, 11 events. 0/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 5 event pairs, 0 based on Foata normal form. 0/11 useless extension candidates. Maximal degree in co-relation 0. Up to 1 conditions per place. [2021-03-25 17:48:03,724 INFO L142 LiptonReduction]: Number of co-enabled transitions 18 [2021-03-25 17:48:03,725 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:48:03,725 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:48:03,725 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 17:48:03,726 INFO L480 AbstractCegarLoop]: Abstraction has has 18 places, 11 transitions, 31 flow [2021-03-25 17:48:03,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,726 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:48:03,726 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:48:03,727 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-25 17:48:03,727 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:48:03,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:48:03,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1427696431, now seen corresponding path program 1 times [2021-03-25 17:48:03,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:48:03,728 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495652660] [2021-03-25 17:48:03,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:48:03,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:48:03,744 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:48:03,745 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:48:03,753 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:48:03,753 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495652660] [2021-03-25 17:48:03,754 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:48:03,754 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:48:03,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040810726] [2021-03-25 17:48:03,754 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:48:03,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:48:03,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:48:03,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:48:03,756 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 25 out of 28 [2021-03-25 17:48:03,756 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 18 places, 11 transitions, 31 flow. Second operand has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,756 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:48:03,756 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 25 of 28 [2021-03-25 17:48:03,757 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:48:03,759 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-03-25 17:48:03,759 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:48:03,759 INFO L84 FinitePrefix]: Finished finitePrefix Result has 19 conditions, 10 events. 0/10 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 7 event pairs, 0 based on Foata normal form. 1/11 useless extension candidates. Maximal degree in co-relation 0. Up to 1 conditions per place. [2021-03-25 17:48:03,759 INFO L132 encePairwiseOnDemand]: 26/28 looper letters, 0 selfloop transitions, 0 changer transitions 10/10 dead transitions. [2021-03-25 17:48:03,759 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 19 places, 10 transitions, 31 flow [2021-03-25 17:48:03,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:48:03,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:48:03,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 77 transitions. [2021-03-25 17:48:03,760 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.9166666666666666 [2021-03-25 17:48:03,761 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 77 transitions. [2021-03-25 17:48:03,761 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 77 transitions. [2021-03-25 17:48:03,761 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:48:03,761 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 77 transitions. [2021-03-25 17:48:03,762 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,762 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,762 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,762 INFO L185 Difference]: Start difference. First operand has 18 places, 11 transitions, 31 flow. Second operand 3 states and 77 transitions. [2021-03-25 17:48:03,763 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 19 places, 10 transitions, 31 flow [2021-03-25 17:48:03,763 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 18 places, 10 transitions, 30 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-25 17:48:03,763 INFO L241 Difference]: Finished difference. Result has 18 places, 0 transitions, 0 flow [2021-03-25 17:48:03,764 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=28, PETRI_DIFFERENCE_MINUEND_FLOW=28, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=18, PETRI_TRANSITIONS=0} [2021-03-25 17:48:03,764 INFO L343 CegarLoopForPetriNet]: 21 programPoint places, -3 predicate places. [2021-03-25 17:48:03,764 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:48:03,764 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 18 places, 0 transitions, 0 flow [2021-03-25 17:48:03,765 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 18 places, 0 transitions, 0 flow [2021-03-25 17:48:03,765 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 0 places, 0 transitions, 0 flow [2021-03-25 17:48:03,765 INFO L129 PetriNetUnfolder]: 0/0 cut-off events. [2021-03-25 17:48:03,765 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:48:03,765 INFO L84 FinitePrefix]: Finished finitePrefix Result has 0 conditions, 0 events. 0/0 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 0. Compared 0 event pairs, 0 based on Foata normal form. 0/0 useless extension candidates. Maximal degree in co-relation 0. Up to 0 conditions per place. [2021-03-25 17:48:03,765 INFO L142 LiptonReduction]: Number of co-enabled transitions 0 [2021-03-25 17:48:03,765 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:48:03,765 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:48:03,766 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 2 [2021-03-25 17:48:03,766 INFO L480 AbstractCegarLoop]: Abstraction has has 0 places, 0 transitions, 0 flow [2021-03-25 17:48:03,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 25.666666666666668) internal successors, (77), 3 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-25 17:48:03,767 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-25 17:48:03,770 INFO L202 PluginConnector]: Adding new model example_unnecessary_interleavings.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.03 05:48:03 BasicIcfg [2021-03-25 17:48:03,770 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-25 17:48:03,771 INFO L168 Benchmark]: Toolchain (without parser) took 758.03 ms. Allocated memory is still 325.1 MB. Free memory was 305.3 MB in the beginning and 278.0 MB in the end (delta: 27.2 MB). Peak memory consumption was 29.6 MB. Max. memory is 16.0 GB. [2021-03-25 17:48:03,772 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 325.1 MB. Free memory was 306.3 MB in the beginning and 306.2 MB in the end (delta: 75.1 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-25 17:48:03,772 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.52 ms. Allocated memory is still 325.1 MB. Free memory was 305.2 MB in the beginning and 303.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-25 17:48:03,773 INFO L168 Benchmark]: Boogie Preprocessor took 10.88 ms. Allocated memory is still 325.1 MB. Free memory was 303.8 MB in the beginning and 302.9 MB in the end (delta: 847.7 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-25 17:48:03,774 INFO L168 Benchmark]: RCFGBuilder took 173.26 ms. Allocated memory is still 325.1 MB. Free memory was 302.8 MB in the beginning and 294.0 MB in the end (delta: 8.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.0 GB. [2021-03-25 17:48:03,774 INFO L168 Benchmark]: TraceAbstraction took 544.89 ms. Allocated memory is still 325.1 MB. Free memory was 293.5 MB in the beginning and 278.0 MB in the end (delta: 15.5 MB). Peak memory consumption was 17.0 MB. Max. memory is 16.0 GB. [2021-03-25 17:48:03,777 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 325.1 MB. Free memory was 306.3 MB in the beginning and 306.2 MB in the end (delta: 75.1 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 24.52 ms. Allocated memory is still 325.1 MB. Free memory was 305.2 MB in the beginning and 303.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 10.88 ms. Allocated memory is still 325.1 MB. Free memory was 303.8 MB in the beginning and 302.9 MB in the end (delta: 847.7 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 173.26 ms. Allocated memory is still 325.1 MB. Free memory was 302.8 MB in the beginning and 294.0 MB in the end (delta: 8.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.0 GB. * TraceAbstraction took 544.89 ms. Allocated memory is still 325.1 MB. Free memory was 293.5 MB in the beginning and 278.0 MB in the end (delta: 15.5 MB). Peak memory consumption was 17.0 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 67.5ms, 24 PlacesBefore, 21 PlacesAfterwards, 20 TransitionsBefore, 17 TransitionsAfterwards, 84 CoEnabledTransitionPairs, 2 FixpointIterations, 0 TrivialSequentialCompositions, 3 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 3 TotalNumberOfCompositions, 27 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 27, positive: 27, positive conditional: 0, positive unconditional: 27, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 27, positive: 27, positive conditional: 0, positive unconditional: 27, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 27, positive: 27, positive conditional: 0, positive unconditional: 27, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.Independence Queries: [ total: 27, positive: 27, positive conditional: 0, positive unconditional: 27, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 27, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 27, unknown conditional: 0, unknown unconditional: 27] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 5.8ms, 17 PlacesBefore, 17 PlacesAfterwards, 13 TransitionsBefore, 13 TransitionsAfterwards, 24 CoEnabledTransitionPairs, 1 FixpointIterations, 0 TrivialSequentialCompositions, 0 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 0 TotalNumberOfCompositions, 0 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 4.4ms, 18 PlacesBefore, 18 PlacesAfterwards, 11 TransitionsBefore, 11 TransitionsAfterwards, 18 CoEnabledTransitionPairs, 1 FixpointIterations, 0 TrivialSequentialCompositions, 0 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 0 TotalNumberOfCompositions, 0 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 0.9ms, 18 PlacesBefore, 0 PlacesAfterwards, 0 TransitionsBefore, 0 TransitionsAfterwards, 0 CoEnabledTransitionPairs, 1 FixpointIterations, 0 TrivialSequentialCompositions, 0 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 0 TotalNumberOfCompositions, 0 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - PositiveResult [Line: 20]: assertion always holds For all program executions holds that assertion always holds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 6.2ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 435.1ms, OverallIterations: 3, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 67.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 147.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 3 SDtfs, 2 SDslu, 0 SDs, 0 SdLazy, 2 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=70occurred in iteration=0, InterpolantAutomatonStates: 9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 5.1ms SsaConstructionTime, 15.2ms SatisfiabilityAnalysisTime, 77.7ms InterpolantComputationTime, 33 NumberOfCodeBlocks, 33 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 30 ConstructedInterpolants, 0 QuantifiedInterpolants, 62 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...