/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/weaver-benchmarks/generated/chl/collitem-trans.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-25 19:01:05,337 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-25 19:01:05,339 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-25 19:01:05,371 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-25 19:01:05,372 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-25 19:01:05,374 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-25 19:01:05,376 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-25 19:01:05,381 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-25 19:01:05,382 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-25 19:01:05,386 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-25 19:01:05,387 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-25 19:01:05,388 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-03-25 19:01:05,388 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-25 19:01:05,390 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-25 19:01:05,391 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-25 19:01:05,391 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-25 19:01:05,394 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-25 19:01:05,394 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-25 19:01:05,396 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-25 19:01:05,402 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-25 19:01:05,403 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-25 19:01:05,404 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-25 19:01:05,404 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-25 19:01:05,405 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-25 19:01:05,406 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-03-25 19:01:05,408 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-03-25 19:01:05,408 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-03-25 19:01:05,408 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-03-25 19:01:05,409 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-03-25 19:01:05,409 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-03-25 19:01:05,409 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-03-25 19:01:05,410 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-03-25 19:01:05,410 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-03-25 19:01:05,410 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-25 19:01:05,411 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-25 19:01:05,411 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-25 19:01:05,412 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 19:01:05,425 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-25 19:01:05,425 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-25 19:01:05,426 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-25 19:01:05,426 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-25 19:01:05,426 INFO L138 SettingsManager]: * Use SBE=true [2021-03-25 19:01:05,426 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-25 19:01:05,427 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-25 19:01:05,428 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-25 19:01:05,428 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-25 19:01:05,428 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-25 19:01:05,428 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-25 19:01:05,428 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-25 19:01:05,428 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-25 19:01:05,428 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-25 19:01:05,428 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-25 19:01:05,428 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-25 19:01:05,428 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-25 19:01:05,429 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-25 19:01:05,429 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-25 19:01:05,429 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-03-25 19:01:05,429 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-25 19:01:05,687 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-25 19:01:05,709 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-25 19:01:05,711 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-25 19:01:05,712 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-25 19:01:05,713 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-25 19:01:05,713 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/chl/collitem-trans.wvr.bpl [2021-03-25 19:01:05,714 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/chl/collitem-trans.wvr.bpl' [2021-03-25 19:01:05,755 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-25 19:01:05,756 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-25 19:01:05,757 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-25 19:01:05,757 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-25 19:01:05,757 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-25 19:01:05,765 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,770 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,787 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-25 19:01:05,789 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-25 19:01:05,789 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-25 19:01:05,789 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-25 19:01:05,795 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,795 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,797 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,797 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,801 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,801 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,802 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/1) ... [2021-03-25 19:01:05,805 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-25 19:01:05,806 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-25 19:01:05,807 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-25 19:01:05,807 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-25 19:01:05,808 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (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 19:01:05,860 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-03-25 19:01:05,860 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-03-25 19:01:05,861 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-03-25 19:01:05,861 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-03-25 19:01:05,861 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-03-25 19:01:05,861 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-03-25 19:01:05,862 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-25 19:01:05,862 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-25 19:01:05,862 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-25 19:01:05,862 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-03-25 19:01:05,862 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-03-25 19:01:05,862 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-03-25 19:01:05,863 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 19:01:06,103 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-25 19:01:06,103 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-25 19:01:06,104 INFO L202 PluginConnector]: Adding new model collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 07:01:06 BoogieIcfgContainer [2021-03-25 19:01:06,104 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-25 19:01:06,105 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-25 19:01:06,106 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-25 19:01:06,107 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-25 19:01:06,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 07:01:05" (1/2) ... [2021-03-25 19:01:06,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cfa9a40 and model type collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.03 07:01:06, skipping insertion in model container [2021-03-25 19:01:06,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 07:01:06" (2/2) ... [2021-03-25 19:01:06,109 INFO L111 eAbstractionObserver]: Analyzing ICFG collitem-trans.wvr.bpl [2021-03-25 19:01:06,113 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-25 19:01:06,115 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-25 19:01:06,116 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-25 19:01:06,143 INFO L149 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2021-03-25 19:01:06,154 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-25 19:01:06,170 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 19:01:06,171 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 19:01:06,171 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 19:01:06,171 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 19:01:06,171 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 19:01:06,171 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 19:01:06,171 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 19:01:06,171 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 19:01:06,177 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 19 transitions, 62 flow [2021-03-25 19:01:06,190 INFO L129 PetriNetUnfolder]: 0/16 cut-off events. [2021-03-25 19:01:06,190 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-03-25 19:01:06,191 INFO L84 FinitePrefix]: Finished finitePrefix Result has 29 conditions, 16 events. 0/16 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 14 event pairs, 0 based on Foata normal form. 0/15 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-25 19:01:06,191 INFO L82 GeneralOperation]: Start removeDead. Operand has 29 places, 19 transitions, 62 flow [2021-03-25 19:01:06,194 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 14 transitions, 46 flow [2021-03-25 19:01:06,194 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 19:01:06,203 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 24 places, 14 transitions, 46 flow [2021-03-25 19:01:06,205 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 24 places, 14 transitions, 46 flow [2021-03-25 19:01:06,205 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 14 transitions, 46 flow [2021-03-25 19:01:06,210 INFO L129 PetriNetUnfolder]: 0/14 cut-off events. [2021-03-25 19:01:06,210 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-03-25 19:01:06,210 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 14 events. 0/14 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 14 event pairs, 0 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-25 19:01:06,211 INFO L142 LiptonReduction]: Number of co-enabled transitions 48 [2021-03-25 19:01:06,267 INFO L154 LiptonReduction]: Checked pairs total: 18 [2021-03-25 19:01:06,267 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-25 19:01:06,268 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 74 [2021-03-25 19:01:06,276 INFO L129 PetriNetUnfolder]: 0/9 cut-off events. [2021-03-25 19:01:06,276 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-03-25 19:01:06,276 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 19:01:06,277 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 19:01:06,277 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 19:01:06,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 19:01:06,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1809114803, now seen corresponding path program 1 times [2021-03-25 19:01:06,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 19:01:06,285 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579186351] [2021-03-25 19:01:06,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 19:01:06,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 19:01:06,564 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:06,564 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 19:01:06,655 INFO L142 QuantifierPusher]: treesize reduction 2787, result has 23.2 percent of original size [2021-03-25 19:01:06,663 INFO L147 QuantifierPusher]: treesize reduction 385, result has 54.4 percent of original size 459 [2021-03-25 19:01:06,827 WARN L205 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 39 [2021-03-25 19:01:06,848 INFO L142 QuantifierPusher]: treesize reduction 1339, result has 34.0 percent of original size [2021-03-25 19:01:06,854 INFO L147 QuantifierPusher]: treesize reduction 55, result has 92.0 percent of original size 635 [2021-03-25 19:01:07,080 WARN L205 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 53 [2021-03-25 19:01:07,082 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:07,083 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-03-25 19:01:07,103 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 19:01:07,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579186351] [2021-03-25 19:01:07,104 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 19:01:07,104 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-25 19:01:07,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452378070] [2021-03-25 19:01:07,117 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-25 19:01:07,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 19:01:07,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-25 19:01:07,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-25 19:01:07,129 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 23 [2021-03-25 19:01:07,131 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 10 transitions, 38 flow. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:07,131 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 19:01:07,131 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 23 [2021-03-25 19:01:07,132 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 19:01:07,327 INFO L129 PetriNetUnfolder]: 3/29 cut-off events. [2021-03-25 19:01:07,328 INFO L130 PetriNetUnfolder]: For 11/11 co-relation queries the response was YES. [2021-03-25 19:01:07,329 INFO L84 FinitePrefix]: Finished finitePrefix Result has 66 conditions, 29 events. 3/29 cut-off events. For 11/11 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 81 event pairs, 1 based on Foata normal form. 1/29 useless extension candidates. Maximal degree in co-relation 42. Up to 7 conditions per place. [2021-03-25 19:01:07,330 INFO L132 encePairwiseOnDemand]: 19/23 looper letters, 5 selfloop transitions, 2 changer transitions 1/14 dead transitions. [2021-03-25 19:01:07,330 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 14 transitions, 62 flow [2021-03-25 19:01:07,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-25 19:01:07,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-25 19:01:07,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 79 transitions. [2021-03-25 19:01:07,339 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6869565217391305 [2021-03-25 19:01:07,339 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 79 transitions. [2021-03-25 19:01:07,339 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 79 transitions. [2021-03-25 19:01:07,340 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 19:01:07,353 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 79 transitions. [2021-03-25 19:01:07,355 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 15.8) internal successors, (79), 5 states have internal predecessors, (79), 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 19:01:07,362 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:07,362 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:07,363 INFO L185 Difference]: Start difference. First operand has 20 places, 10 transitions, 38 flow. Second operand 5 states and 79 transitions. [2021-03-25 19:01:07,364 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 14 transitions, 62 flow [2021-03-25 19:01:07,377 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 18 places, 14 transitions, 50 flow, removed 0 selfloop flow, removed 6 redundant places. [2021-03-25 19:01:07,379 INFO L241 Difference]: Finished difference. Result has 21 places, 11 transitions, 41 flow [2021-03-25 19:01:07,380 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=23, PETRI_DIFFERENCE_MINUEND_FLOW=26, PETRI_DIFFERENCE_MINUEND_PLACES=14, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=8, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=41, PETRI_PLACES=21, PETRI_TRANSITIONS=11} [2021-03-25 19:01:07,381 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 1 predicate places. [2021-03-25 19:01:07,381 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 19:01:07,384 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 21 places, 11 transitions, 41 flow [2021-03-25 19:01:07,384 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 21 places, 11 transitions, 41 flow [2021-03-25 19:01:07,385 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 11 transitions, 41 flow [2021-03-25 19:01:07,390 INFO L129 PetriNetUnfolder]: 0/19 cut-off events. [2021-03-25 19:01:07,390 INFO L130 PetriNetUnfolder]: For 4/5 co-relation queries the response was YES. [2021-03-25 19:01:07,390 INFO L84 FinitePrefix]: Finished finitePrefix Result has 37 conditions, 19 events. 0/19 cut-off events. For 4/5 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 29 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-25 19:01:07,390 INFO L142 LiptonReduction]: Number of co-enabled transitions 18 [2021-03-25 19:01:07,392 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 19:01:07,392 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 19:01:07,392 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 11 [2021-03-25 19:01:07,393 INFO L480 AbstractCegarLoop]: Abstraction has has 20 places, 11 transitions, 41 flow [2021-03-25 19:01:07,394 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:07,394 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 19:01:07,394 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 19:01:07,394 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-25 19:01:07,395 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 19:01:07,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 19:01:07,396 INFO L82 PathProgramCache]: Analyzing trace with hash 840283623, now seen corresponding path program 2 times [2021-03-25 19:01:07,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 19:01:07,396 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652106197] [2021-03-25 19:01:07,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 19:01:07,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 19:01:07,535 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:07,536 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 19:01:07,600 INFO L142 QuantifierPusher]: treesize reduction 9033, result has 20.9 percent of original size [2021-03-25 19:01:07,618 INFO L147 QuantifierPusher]: treesize reduction 123, result has 94.8 percent of original size 2264 [2021-03-25 19:01:08,065 WARN L205 SmtUtils]: Spent 435.00 ms on a formula simplification. DAG size of input: 220 DAG size of output: 49 [2021-03-25 19:01:08,074 INFO L142 QuantifierPusher]: treesize reduction 825, result has 45.8 percent of original size [2021-03-25 19:01:08,092 INFO L147 QuantifierPusher]: treesize reduction 336, result has 51.7 percent of original size 360 [2021-03-25 19:01:08,222 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 58 [2021-03-25 19:01:08,228 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:08,229 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-03-25 19:01:08,248 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 19:01:08,248 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652106197] [2021-03-25 19:01:08,248 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 19:01:08,248 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-25 19:01:08,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623708864] [2021-03-25 19:01:08,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-25 19:01:08,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 19:01:08,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-25 19:01:08,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-25 19:01:08,267 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 23 [2021-03-25 19:01:08,268 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 11 transitions, 41 flow. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:08,268 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 19:01:08,268 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 23 [2021-03-25 19:01:08,268 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 19:01:08,436 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 90 [2021-03-25 19:01:08,608 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 97 [2021-03-25 19:01:08,618 INFO L129 PetriNetUnfolder]: 2/29 cut-off events. [2021-03-25 19:01:08,618 INFO L130 PetriNetUnfolder]: For 24/26 co-relation queries the response was YES. [2021-03-25 19:01:08,618 INFO L84 FinitePrefix]: Finished finitePrefix Result has 70 conditions, 29 events. 2/29 cut-off events. For 24/26 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 76 event pairs, 0 based on Foata normal form. 1/27 useless extension candidates. Maximal degree in co-relation 58. Up to 7 conditions per place. [2021-03-25 19:01:08,619 INFO L132 encePairwiseOnDemand]: 19/23 looper letters, 5 selfloop transitions, 2 changer transitions 3/16 dead transitions. [2021-03-25 19:01:08,619 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 16 transitions, 85 flow [2021-03-25 19:01:08,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-25 19:01:08,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-25 19:01:08,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 79 transitions. [2021-03-25 19:01:08,621 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6869565217391305 [2021-03-25 19:01:08,621 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 79 transitions. [2021-03-25 19:01:08,621 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 79 transitions. [2021-03-25 19:01:08,621 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 19:01:08,621 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 79 transitions. [2021-03-25 19:01:08,621 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 15.8) internal successors, (79), 5 states have internal predecessors, (79), 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 19:01:08,622 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:08,622 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:08,622 INFO L185 Difference]: Start difference. First operand has 20 places, 11 transitions, 41 flow. Second operand 5 states and 79 transitions. [2021-03-25 19:01:08,622 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 16 transitions, 85 flow [2021-03-25 19:01:08,623 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 22 places, 16 transitions, 78 flow, removed 2 selfloop flow, removed 2 redundant places. [2021-03-25 19:01:08,623 INFO L241 Difference]: Finished difference. Result has 25 places, 11 transitions, 51 flow [2021-03-25 19:01:08,623 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=23, PETRI_DIFFERENCE_MINUEND_FLOW=38, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=51, PETRI_PLACES=25, PETRI_TRANSITIONS=11} [2021-03-25 19:01:08,624 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 5 predicate places. [2021-03-25 19:01:08,624 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 19:01:08,624 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 25 places, 11 transitions, 51 flow [2021-03-25 19:01:08,624 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 25 places, 11 transitions, 51 flow [2021-03-25 19:01:08,624 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 11 transitions, 51 flow [2021-03-25 19:01:08,627 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-25 19:01:08,627 INFO L130 PetriNetUnfolder]: For 13/14 co-relation queries the response was YES. [2021-03-25 19:01:08,627 INFO L84 FinitePrefix]: Finished finitePrefix Result has 43 conditions, 17 events. 0/17 cut-off events. For 13/14 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 24 event pairs, 0 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-25 19:01:08,629 INFO L142 LiptonReduction]: Number of co-enabled transitions 14 [2021-03-25 19:01:08,631 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 19:01:08,631 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 19:01:08,631 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 7 [2021-03-25 19:01:08,632 INFO L480 AbstractCegarLoop]: Abstraction has has 24 places, 11 transitions, 51 flow [2021-03-25 19:01:08,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:08,632 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 19:01:08,632 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 19:01:08,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-25 19:01:08,632 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 19:01:08,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 19:01:08,633 INFO L82 PathProgramCache]: Analyzing trace with hash -31273989, now seen corresponding path program 3 times [2021-03-25 19:01:08,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 19:01:08,633 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528652578] [2021-03-25 19:01:08,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 19:01:08,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 19:01:08,743 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:08,743 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 19:01:08,754 INFO L142 QuantifierPusher]: treesize reduction 1977, result has 27.9 percent of original size [2021-03-25 19:01:08,758 INFO L147 QuantifierPusher]: treesize reduction 166, result has 78.3 percent of original size 598 [2021-03-25 19:01:08,881 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 33 [2021-03-25 19:01:08,944 INFO L142 QuantifierPusher]: treesize reduction 18199, result has 7.9 percent of original size [2021-03-25 19:01:08,957 INFO L147 QuantifierPusher]: treesize reduction 336, result has 78.5 percent of original size 1227 [2021-03-25 19:01:09,257 WARN L205 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 45 [2021-03-25 19:01:09,259 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:09,260 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-03-25 19:01:09,276 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 19:01:09,279 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528652578] [2021-03-25 19:01:09,280 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 19:01:09,280 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-25 19:01:09,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638743691] [2021-03-25 19:01:09,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-25 19:01:09,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 19:01:09,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-25 19:01:09,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-25 19:01:09,282 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 23 [2021-03-25 19:01:09,283 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 11 transitions, 51 flow. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:09,283 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 19:01:09,283 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 23 [2021-03-25 19:01:09,283 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 19:01:09,440 INFO L129 PetriNetUnfolder]: 1/23 cut-off events. [2021-03-25 19:01:09,441 INFO L130 PetriNetUnfolder]: For 43/46 co-relation queries the response was YES. [2021-03-25 19:01:09,441 INFO L84 FinitePrefix]: Finished finitePrefix Result has 70 conditions, 23 events. 1/23 cut-off events. For 43/46 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 50 event pairs, 1 based on Foata normal form. 1/23 useless extension candidates. Maximal degree in co-relation 56. Up to 5 conditions per place. [2021-03-25 19:01:09,441 INFO L132 encePairwiseOnDemand]: 19/23 looper letters, 5 selfloop transitions, 3 changer transitions 1/15 dead transitions. [2021-03-25 19:01:09,441 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 28 places, 15 transitions, 93 flow [2021-03-25 19:01:09,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-25 19:01:09,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-25 19:01:09,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 79 transitions. [2021-03-25 19:01:09,442 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6869565217391305 [2021-03-25 19:01:09,442 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 79 transitions. [2021-03-25 19:01:09,442 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 79 transitions. [2021-03-25 19:01:09,443 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 19:01:09,443 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 79 transitions. [2021-03-25 19:01:09,443 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 15.8) internal successors, (79), 5 states have internal predecessors, (79), 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 19:01:09,444 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:09,444 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:09,444 INFO L185 Difference]: Start difference. First operand has 24 places, 11 transitions, 51 flow. Second operand 5 states and 79 transitions. [2021-03-25 19:01:09,444 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 28 places, 15 transitions, 93 flow [2021-03-25 19:01:09,445 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 15 transitions, 74 flow, removed 7 selfloop flow, removed 4 redundant places. [2021-03-25 19:01:09,445 INFO L241 Difference]: Finished difference. Result has 27 places, 12 transitions, 62 flow [2021-03-25 19:01:09,445 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=23, PETRI_DIFFERENCE_MINUEND_FLOW=42, PETRI_DIFFERENCE_MINUEND_PLACES=20, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=8, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=62, PETRI_PLACES=27, PETRI_TRANSITIONS=12} [2021-03-25 19:01:09,445 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 7 predicate places. [2021-03-25 19:01:09,445 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 19:01:09,445 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 27 places, 12 transitions, 62 flow [2021-03-25 19:01:09,446 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 27 places, 12 transitions, 62 flow [2021-03-25 19:01:09,446 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 12 transitions, 62 flow [2021-03-25 19:01:09,448 INFO L129 PetriNetUnfolder]: 0/19 cut-off events. [2021-03-25 19:01:09,449 INFO L130 PetriNetUnfolder]: For 23/24 co-relation queries the response was YES. [2021-03-25 19:01:09,449 INFO L84 FinitePrefix]: Finished finitePrefix Result has 51 conditions, 19 events. 0/19 cut-off events. For 23/24 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 28 event pairs, 0 based on Foata normal form. 0/18 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-25 19:01:09,449 INFO L142 LiptonReduction]: Number of co-enabled transitions 14 [2021-03-25 19:01:09,449 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 19:01:09,449 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 19:01:09,450 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 19:01:09,450 INFO L480 AbstractCegarLoop]: Abstraction has has 26 places, 12 transitions, 62 flow [2021-03-25 19:01:09,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:09,450 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 19:01:09,450 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 19:01:09,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-25 19:01:09,450 INFO L428 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 19:01:09,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 19:01:09,451 INFO L82 PathProgramCache]: Analyzing trace with hash -15909717, now seen corresponding path program 4 times [2021-03-25 19:01:09,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 19:01:09,451 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35419184] [2021-03-25 19:01:09,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 19:01:09,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 19:01:09,516 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:09,517 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 19:01:09,560 INFO L142 QuantifierPusher]: treesize reduction 28376, result has 3.6 percent of original size [2021-03-25 19:01:09,564 INFO L147 QuantifierPusher]: treesize reduction 140, result has 86.7 percent of original size 913 [2021-03-25 19:01:09,683 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 35 [2021-03-25 19:01:09,691 INFO L142 QuantifierPusher]: treesize reduction 979, result has 29.2 percent of original size [2021-03-25 19:01:09,693 INFO L147 QuantifierPusher]: treesize reduction 268, result has 33.5 percent of original size 135 [2021-03-25 19:01:09,791 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:09,792 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-03-25 19:01:09,812 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 19:01:09,813 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35419184] [2021-03-25 19:01:09,813 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 19:01:09,813 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-25 19:01:09,813 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143289742] [2021-03-25 19:01:09,813 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-25 19:01:09,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 19:01:09,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-25 19:01:09,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-25 19:01:09,814 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 23 [2021-03-25 19:01:09,814 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 26 places, 12 transitions, 62 flow. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:09,814 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 19:01:09,815 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 23 [2021-03-25 19:01:09,815 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 19:01:09,948 INFO L129 PetriNetUnfolder]: 1/20 cut-off events. [2021-03-25 19:01:09,948 INFO L130 PetriNetUnfolder]: For 34/37 co-relation queries the response was YES. [2021-03-25 19:01:09,949 INFO L84 FinitePrefix]: Finished finitePrefix Result has 66 conditions, 20 events. 1/20 cut-off events. For 34/37 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 32 event pairs, 1 based on Foata normal form. 1/20 useless extension candidates. Maximal degree in co-relation 55. Up to 5 conditions per place. [2021-03-25 19:01:09,950 INFO L132 encePairwiseOnDemand]: 19/23 looper letters, 3 selfloop transitions, 1 changer transitions 4/14 dead transitions. [2021-03-25 19:01:09,950 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 14 transitions, 92 flow [2021-03-25 19:01:09,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-25 19:01:09,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-25 19:01:09,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 78 transitions. [2021-03-25 19:01:09,952 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6782608695652174 [2021-03-25 19:01:09,953 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 78 transitions. [2021-03-25 19:01:09,953 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 78 transitions. [2021-03-25 19:01:09,954 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 19:01:09,954 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 78 transitions. [2021-03-25 19:01:09,955 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 15.6) internal successors, (78), 5 states have internal predecessors, (78), 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 19:01:09,956 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:09,956 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:09,956 INFO L185 Difference]: Start difference. First operand has 26 places, 12 transitions, 62 flow. Second operand 5 states and 78 transitions. [2021-03-25 19:01:09,956 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 14 transitions, 92 flow [2021-03-25 19:01:09,959 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 14 transitions, 88 flow, removed 1 selfloop flow, removed 2 redundant places. [2021-03-25 19:01:09,959 INFO L241 Difference]: Finished difference. Result has 30 places, 10 transitions, 49 flow [2021-03-25 19:01:09,959 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=23, PETRI_DIFFERENCE_MINUEND_FLOW=58, PETRI_DIFFERENCE_MINUEND_PLACES=24, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=49, PETRI_PLACES=30, PETRI_TRANSITIONS=10} [2021-03-25 19:01:09,959 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 10 predicate places. [2021-03-25 19:01:09,959 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 19:01:09,960 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 30 places, 10 transitions, 49 flow [2021-03-25 19:01:09,960 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 30 places, 10 transitions, 49 flow [2021-03-25 19:01:09,960 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 10 transitions, 49 flow [2021-03-25 19:01:09,962 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-03-25 19:01:09,962 INFO L130 PetriNetUnfolder]: For 14/15 co-relation queries the response was YES. [2021-03-25 19:01:09,963 INFO L84 FinitePrefix]: Finished finitePrefix Result has 33 conditions, 10 events. 0/10 cut-off events. For 14/15 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 0/10 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-25 19:01:09,963 INFO L142 LiptonReduction]: Number of co-enabled transitions 4 [2021-03-25 19:01:09,964 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 19:01:09,964 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 19:01:09,964 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 19:01:09,966 INFO L480 AbstractCegarLoop]: Abstraction has has 27 places, 10 transitions, 49 flow [2021-03-25 19:01:09,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:09,966 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 19:01:09,967 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 19:01:09,967 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-25 19:01:09,967 INFO L428 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 19:01:09,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 19:01:09,967 INFO L82 PathProgramCache]: Analyzing trace with hash 815259183, now seen corresponding path program 5 times [2021-03-25 19:01:09,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 19:01:09,967 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1485089867] [2021-03-25 19:01:09,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 19:01:09,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 19:01:10,036 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:10,037 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 19:01:10,071 INFO L142 QuantifierPusher]: treesize reduction 9632, result has 18.3 percent of original size [2021-03-25 19:01:10,080 INFO L147 QuantifierPusher]: treesize reduction 312, result has 85.6 percent of original size 1848 [2021-03-25 19:01:10,458 WARN L205 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 189 DAG size of output: 50 [2021-03-25 19:01:10,476 INFO L142 QuantifierPusher]: treesize reduction 1376, result has 40.8 percent of original size [2021-03-25 19:01:10,483 INFO L147 QuantifierPusher]: treesize reduction 184, result has 80.6 percent of original size 766 [2021-03-25 19:01:10,735 WARN L205 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 56 [2021-03-25 19:01:10,737 INFO L142 QuantifierPusher]: treesize reduction 16, result has 59.0 percent of original size [2021-03-25 19:01:10,739 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 23 [2021-03-25 19:01:10,756 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 19:01:10,756 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1485089867] [2021-03-25 19:01:10,757 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 19:01:10,757 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-25 19:01:10,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352191259] [2021-03-25 19:01:10,757 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-25 19:01:10,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 19:01:10,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-25 19:01:10,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-25 19:01:10,758 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 23 [2021-03-25 19:01:10,758 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 10 transitions, 49 flow. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:10,758 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 19:01:10,758 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 23 [2021-03-25 19:01:10,758 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 19:01:10,998 WARN L205 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 85 [2021-03-25 19:01:11,240 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 92 [2021-03-25 19:01:11,246 INFO L129 PetriNetUnfolder]: 0/16 cut-off events. [2021-03-25 19:01:11,246 INFO L130 PetriNetUnfolder]: For 32/32 co-relation queries the response was YES. [2021-03-25 19:01:11,246 INFO L84 FinitePrefix]: Finished finitePrefix Result has 58 conditions, 16 events. 0/16 cut-off events. For 32/32 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 12 event pairs, 0 based on Foata normal form. 1/16 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-25 19:01:11,246 INFO L132 encePairwiseOnDemand]: 19/23 looper letters, 3 selfloop transitions, 1 changer transitions 2/12 dead transitions. [2021-03-25 19:01:11,246 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 12 transitions, 80 flow [2021-03-25 19:01:11,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-25 19:01:11,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-25 19:01:11,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 77 transitions. [2021-03-25 19:01:11,247 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6695652173913044 [2021-03-25 19:01:11,247 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 77 transitions. [2021-03-25 19:01:11,247 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 77 transitions. [2021-03-25 19:01:11,247 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 19:01:11,247 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 77 transitions. [2021-03-25 19:01:11,247 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 15.4) internal successors, (77), 5 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 19:01:11,248 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:11,248 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:11,248 INFO L185 Difference]: Start difference. First operand has 27 places, 10 transitions, 49 flow. Second operand 5 states and 77 transitions. [2021-03-25 19:01:11,248 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 12 transitions, 80 flow [2021-03-25 19:01:11,248 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 12 transitions, 47 flow, removed 5 selfloop flow, removed 11 redundant places. [2021-03-25 19:01:11,249 INFO L241 Difference]: Finished difference. Result has 23 places, 10 transitions, 35 flow [2021-03-25 19:01:11,249 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=23, PETRI_DIFFERENCE_MINUEND_FLOW=26, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=35, PETRI_PLACES=23, PETRI_TRANSITIONS=10} [2021-03-25 19:01:11,249 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 3 predicate places. [2021-03-25 19:01:11,249 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 19:01:11,249 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 23 places, 10 transitions, 35 flow [2021-03-25 19:01:11,249 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 23 places, 10 transitions, 35 flow [2021-03-25 19:01:11,249 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 10 transitions, 35 flow [2021-03-25 19:01:11,251 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-25 19:01:11,251 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-03-25 19:01:11,251 INFO L84 FinitePrefix]: Finished finitePrefix Result has 26 conditions, 11 events. 0/11 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 2 event pairs, 0 based on Foata normal form. 0/10 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-25 19:01:11,251 INFO L142 LiptonReduction]: Number of co-enabled transitions 2 [2021-03-25 19:01:11,251 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 19:01:11,251 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 19:01:11,252 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 3 [2021-03-25 19:01:11,252 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 10 transitions, 35 flow [2021-03-25 19:01:11,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:11,252 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 19:01:11,252 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 19:01:11,252 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-25 19:01:11,252 INFO L428 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 19:01:11,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 19:01:11,252 INFO L82 PathProgramCache]: Analyzing trace with hash -902489877, now seen corresponding path program 6 times [2021-03-25 19:01:11,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 19:01:11,253 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585683516] [2021-03-25 19:01:11,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 19:01:11,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 19:01:11,278 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:11,279 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-25 19:01:11,324 INFO L142 QuantifierPusher]: treesize reduction 26263, result has 10.8 percent of original size [2021-03-25 19:01:11,331 INFO L147 QuantifierPusher]: treesize reduction 2159, result has 31.8 percent of original size 1007 [2021-03-25 19:01:11,547 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 37 [2021-03-25 19:01:11,554 INFO L142 QuantifierPusher]: treesize reduction 1093, result has 20.9 percent of original size [2021-03-25 19:01:11,556 INFO L147 QuantifierPusher]: treesize reduction 144, result has 50.2 percent of original size 145 [2021-03-25 19:01:11,624 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 19:01:11,625 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-03-25 19:01:11,642 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 19:01:11,642 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585683516] [2021-03-25 19:01:11,642 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 19:01:11,642 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-25 19:01:11,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083361957] [2021-03-25 19:01:11,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-25 19:01:11,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 19:01:11,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-25 19:01:11,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-03-25 19:01:11,643 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 23 [2021-03-25 19:01:11,643 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 21 places, 10 transitions, 35 flow. Second operand has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:11,643 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 19:01:11,643 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 23 [2021-03-25 19:01:11,643 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 19:01:11,748 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-03-25 19:01:11,748 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-25 19:01:11,748 INFO L84 FinitePrefix]: Finished finitePrefix Result has 29 conditions, 10 events. 0/10 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 3 event pairs, 0 based on Foata normal form. 1/11 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-25 19:01:11,748 INFO L132 encePairwiseOnDemand]: 19/23 looper letters, 0 selfloop transitions, 0 changer transitions 10/10 dead transitions. [2021-03-25 19:01:11,748 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 10 transitions, 44 flow [2021-03-25 19:01:11,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-25 19:01:11,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-25 19:01:11,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 75 transitions. [2021-03-25 19:01:11,749 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6521739130434783 [2021-03-25 19:01:11,749 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 75 transitions. [2021-03-25 19:01:11,749 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 75 transitions. [2021-03-25 19:01:11,749 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 19:01:11,749 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 75 transitions. [2021-03-25 19:01:11,749 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 15.0) internal successors, (75), 5 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 19:01:11,750 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:11,750 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 23.0) internal successors, (138), 6 states have internal predecessors, (138), 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 19:01:11,750 INFO L185 Difference]: Start difference. First operand has 21 places, 10 transitions, 35 flow. Second operand 5 states and 75 transitions. [2021-03-25 19:01:11,750 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 10 transitions, 44 flow [2021-03-25 19:01:11,750 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 22 places, 10 transitions, 40 flow, removed 1 selfloop flow, removed 2 redundant places. [2021-03-25 19:01:11,750 INFO L241 Difference]: Finished difference. Result has 22 places, 0 transitions, 0 flow [2021-03-25 19:01:11,750 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=23, PETRI_DIFFERENCE_MINUEND_FLOW=28, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=9, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=0, PETRI_PLACES=22, PETRI_TRANSITIONS=0} [2021-03-25 19:01:11,750 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 2 predicate places. [2021-03-25 19:01:11,750 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 19:01:11,751 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 22 places, 0 transitions, 0 flow [2021-03-25 19:01:11,751 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 22 places, 0 transitions, 0 flow [2021-03-25 19:01:11,751 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 0 places, 0 transitions, 0 flow [2021-03-25 19:01:11,751 INFO L129 PetriNetUnfolder]: 0/0 cut-off events. [2021-03-25 19:01:11,751 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 19:01:11,751 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 19:01:11,751 INFO L142 LiptonReduction]: Number of co-enabled transitions 0 [2021-03-25 19:01:11,751 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 19:01:11,751 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 19:01:11,751 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 1 [2021-03-25 19:01:11,752 INFO L480 AbstractCegarLoop]: Abstraction has has 0 places, 0 transitions, 0 flow [2021-03-25 19:01:11,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 14.8) internal successors, (74), 5 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 19:01:11,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-25 19:01:11,754 INFO L202 PluginConnector]: Adding new model collitem-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.03 07:01:11 BasicIcfg [2021-03-25 19:01:11,754 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-25 19:01:11,755 INFO L168 Benchmark]: Toolchain (without parser) took 5998.87 ms. Allocated memory was 343.9 MB in the beginning and 413.1 MB in the end (delta: 69.2 MB). Free memory was 324.3 MB in the beginning and 384.6 MB in the end (delta: -60.4 MB). Peak memory consumption was 10.3 MB. Max. memory is 16.0 GB. [2021-03-25 19:01:11,755 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.71 ms. Allocated memory is still 343.9 MB. Free memory was 325.4 MB in the beginning and 325.3 MB in the end (delta: 79.2 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-25 19:01:11,755 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.78 ms. Allocated memory is still 343.9 MB. Free memory was 324.1 MB in the beginning and 322.7 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-25 19:01:11,755 INFO L168 Benchmark]: Boogie Preprocessor took 16.56 ms. Allocated memory is still 343.9 MB. Free memory was 322.7 MB in the beginning and 321.8 MB in the end (delta: 936.4 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-25 19:01:11,756 INFO L168 Benchmark]: RCFGBuilder took 297.96 ms. Allocated memory is still 343.9 MB. Free memory was 321.7 MB in the beginning and 304.8 MB in the end (delta: 16.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.0 GB. [2021-03-25 19:01:11,756 INFO L168 Benchmark]: TraceAbstraction took 5648.86 ms. Allocated memory was 343.9 MB in the beginning and 413.1 MB in the end (delta: 69.2 MB). Free memory was 304.4 MB in the beginning and 384.6 MB in the end (delta: -80.3 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-25 19:01:11,757 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 0.71 ms. Allocated memory is still 343.9 MB. Free memory was 325.4 MB in the beginning and 325.3 MB in the end (delta: 79.2 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 30.78 ms. Allocated memory is still 343.9 MB. Free memory was 324.1 MB in the beginning and 322.7 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 16.56 ms. Allocated memory is still 343.9 MB. Free memory was 322.7 MB in the beginning and 321.8 MB in the end (delta: 936.4 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 297.96 ms. Allocated memory is still 343.9 MB. Free memory was 321.7 MB in the beginning and 304.8 MB in the end (delta: 16.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.0 GB. * TraceAbstraction took 5648.86 ms. Allocated memory was 343.9 MB in the beginning and 413.1 MB in the end (delta: 69.2 MB). Free memory was 304.4 MB in the beginning and 384.6 MB in the end (delta: -80.3 MB). There was no memory consumed. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 62.2ms, 24 PlacesBefore, 20 PlacesAfterwards, 14 TransitionsBefore, 10 TransitionsAfterwards, 48 CoEnabledTransitionPairs, 2 FixpointIterations, 1 TrivialSequentialCompositions, 3 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 4 TotalNumberOfCompositions, 18 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 18, positive: 18, positive conditional: 0, positive unconditional: 18, 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: 18, positive: 18, positive conditional: 0, positive unconditional: 18, 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: 18, positive: 18, positive conditional: 0, positive unconditional: 18, 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: 18, positive: 18, positive conditional: 0, positive unconditional: 18, 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: 18, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 18, unknown conditional: 0, unknown unconditional: 18] , 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: 7.4ms, 21 PlacesBefore, 20 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: 6.5ms, 25 PlacesBefore, 24 PlacesAfterwards, 11 TransitionsBefore, 11 TransitionsAfterwards, 14 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: 3.8ms, 27 PlacesBefore, 26 PlacesAfterwards, 12 TransitionsBefore, 12 TransitionsAfterwards, 14 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: 4.0ms, 30 PlacesBefore, 27 PlacesAfterwards, 10 TransitionsBefore, 10 TransitionsAfterwards, 4 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: 2.2ms, 23 PlacesBefore, 21 PlacesAfterwards, 10 TransitionsBefore, 10 TransitionsAfterwards, 2 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: 0.4ms, 22 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: 68]: 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: 3.4ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 5584.5ms, OverallIterations: 6, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 1525.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 101.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 16 SDtfs, 27 SDslu, 0 SDs, 0 SdLazy, 94 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 91.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 36 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3866.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=62occurred in iteration=3, InterpolantAutomatonStates: 30, 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: 8.6ms SsaConstructionTime, 148.3ms SatisfiabilityAnalysisTime, 3641.4ms InterpolantComputationTime, 60 NumberOfCodeBlocks, 60 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 54 ConstructedInterpolants, 0 QuantifiedInterpolants, 1801 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 6 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...