/usr/bin/java -Xmx8000000000 -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-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/showcase/Bakery.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-9bbddad6b14272d9691b7fb6f1c011d15ab18596-9bbddad [2021-06-13 08:22:37,642 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-13 08:22:37,644 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-13 08:22:37,671 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-06-13 08:22:37,672 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-06-13 08:22:37,674 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-06-13 08:22:37,676 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-06-13 08:22:37,680 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-06-13 08:22:37,681 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-06-13 08:22:37,684 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-06-13 08:22:37,685 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-06-13 08:22:37,686 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-06-13 08:22:37,686 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-06-13 08:22:37,688 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-06-13 08:22:37,688 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-06-13 08:22:37,689 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-06-13 08:22:37,691 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-06-13 08:22:37,692 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-06-13 08:22:37,693 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-06-13 08:22:37,697 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-06-13 08:22:37,699 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-06-13 08:22:37,700 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-06-13 08:22:37,701 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-06-13 08:22:37,702 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-06-13 08:22:37,706 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-06-13 08:22:37,712 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-06-13 08:22:37,713 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-06-13 08:22:37,713 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-06-13 08:22:37,714 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-NoLbe.epf [2021-06-13 08:22:37,751 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-13 08:22:37,752 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-13 08:22:37,753 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-13 08:22:37,754 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-13 08:22:37,754 INFO L138 SettingsManager]: * Use SBE=true [2021-06-13 08:22:37,754 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-13 08:22:37,754 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-13 08:22:37,754 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-13 08:22:37,754 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-13 08:22:37,754 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-13 08:22:37,755 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-13 08:22:37,755 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-13 08:22:37,755 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-13 08:22:37,755 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-13 08:22:37,755 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-13 08:22:37,756 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-13 08:22:37,756 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-13 08:22:37,756 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-13 08:22:37,756 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-13 08:22:37,756 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-13 08:22:37,756 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-13 08:22:37,756 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-13 08:22:37,756 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-13 08:22:37,756 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-13 08:22:37,757 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-13 08:22:37,757 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-13 08:22:37,757 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-13 08:22:37,757 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-13 08:22:37,757 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-06-13 08:22:37,757 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-13 08:22:37,999 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-13 08:22:38,013 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-13 08:22:38,014 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-13 08:22:38,015 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-13 08:22:38,015 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-13 08:22:38,016 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/showcase/Bakery.bpl [2021-06-13 08:22:38,016 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/showcase/Bakery.bpl' [2021-06-13 08:22:38,040 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-13 08:22:38,041 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-13 08:22:38,042 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-13 08:22:38,042 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-13 08:22:38,042 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-13 08:22:38,050 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,055 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,060 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-13 08:22:38,061 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-13 08:22:38,061 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-13 08:22:38,061 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-13 08:22:38,066 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,066 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,067 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,067 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,069 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,071 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,072 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/1) ... [2021-06-13 08:22:38,072 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-13 08:22:38,074 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-13 08:22:38,074 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-13 08:22:38,074 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-13 08:22:38,075 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (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 [2021-06-13 08:22:38,120 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Process0 given in one single declaration [2021-06-13 08:22:38,121 INFO L130 BoogieDeclarations]: Found specification of procedure Process0 [2021-06-13 08:22:38,122 INFO L138 BoogieDeclarations]: Found implementation of procedure Process0 [2021-06-13 08:22:38,122 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Process1 given in one single declaration [2021-06-13 08:22:38,122 INFO L130 BoogieDeclarations]: Found specification of procedure Process1 [2021-06-13 08:22:38,122 INFO L138 BoogieDeclarations]: Found implementation of procedure Process1 [2021-06-13 08:22:38,122 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-06-13 08:22:38,122 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-13 08:22:38,123 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-13 08:22:38,123 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-06-13 08:22:38,250 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-13 08:22:38,250 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-06-13 08:22:38,251 INFO L202 PluginConnector]: Adding new model Bakery.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.06 08:22:38 BoogieIcfgContainer [2021-06-13 08:22:38,251 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-13 08:22:38,253 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-13 08:22:38,253 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-13 08:22:38,254 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-13 08:22:38,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Bakery.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:38" (1/2) ... [2021-06-13 08:22:38,255 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32765d1b and model type Bakery.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.06 08:22:38, skipping insertion in model container [2021-06-13 08:22:38,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Bakery.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.06 08:22:38" (2/2) ... [2021-06-13 08:22:38,262 INFO L111 eAbstractionObserver]: Analyzing ICFG Bakery.bpl [2021-06-13 08:22:38,266 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-13 08:22:38,266 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-06-13 08:22:38,266 INFO L471 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-13 08:22:38,302 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-13 08:22:38,324 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-13 08:22:38,344 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:38,344 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:38,344 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:38,345 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:38,345 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:38,345 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:38,345 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:38,345 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process0======== [2021-06-13 08:22:38,352 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:38,368 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:38,369 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,372 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 24 events. 2/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 45 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 22. Up to 2 conditions per place. [2021-06-13 08:22:38,372 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:38,374 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 0 places, 0 transitions, 0 flow [2021-06-13 08:22:38,374 INFO L129 PetriNetUnfolder]: 0/0 cut-off events. [2021-06-13 08:22:38,374 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,375 INFO L301 ceAbstractionStarter]: Result for error location Process0 was SAFE (1/5) [2021-06-13 08:22:38,376 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-13 08:22:38,386 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:38,386 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:38,386 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:38,386 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:38,386 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:38,386 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:38,386 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:38,386 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process1======== [2021-06-13 08:22:38,388 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:38,394 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:38,394 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,394 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 24 events. 2/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 45 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 22. Up to 2 conditions per place. [2021-06-13 08:22:38,394 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:38,394 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 0 places, 0 transitions, 0 flow [2021-06-13 08:22:38,394 INFO L129 PetriNetUnfolder]: 0/0 cut-off events. [2021-06-13 08:22:38,394 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,395 INFO L301 ceAbstractionStarter]: Result for error location Process1 was SAFE (2/5) [2021-06-13 08:22:38,395 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-06-13 08:22:38,397 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:38,397 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:38,397 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:38,397 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:38,397 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:38,398 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:38,398 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:38,398 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-06-13 08:22:38,400 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:38,408 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:38,408 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,409 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 24 events. 2/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 45 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 22. Up to 2 conditions per place. [2021-06-13 08:22:38,409 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:38,409 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 0 places, 0 transitions, 0 flow [2021-06-13 08:22:38,409 INFO L129 PetriNetUnfolder]: 0/0 cut-off events. [2021-06-13 08:22:38,409 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,410 INFO L301 ceAbstractionStarter]: Result for error location ULTIMATE.start was SAFE (3/5) [2021-06-13 08:22:38,410 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-13 08:22:38,412 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:38,412 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:38,412 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:38,412 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:38,412 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:38,413 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:38,413 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:38,413 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process1Thread1of1ForFork1======== [2021-06-13 08:22:38,416 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:38,423 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:38,423 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,423 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 24 events. 2/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 45 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 22. Up to 2 conditions per place. [2021-06-13 08:22:38,424 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:38,425 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 24 transitions, 54 flow [2021-06-13 08:22:38,435 INFO L129 PetriNetUnfolder]: 0/16 cut-off events. [2021-06-13 08:22:38,435 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,435 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:38,435 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:38,436 INFO L430 AbstractCegarLoop]: === Iteration 1 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:38,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:38,439 INFO L82 PathProgramCache]: Analyzing trace with hash 281769241, now seen corresponding path program 1 times [2021-06-13 08:22:38,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:38,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463799356] [2021-06-13 08:22:38,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:38,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:38,526 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,527 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:38,553 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:38,553 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463799356] [2021-06-13 08:22:38,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463799356] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:38,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:38,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-06-13 08:22:38,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852907003] [2021-06-13 08:22:38,559 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-13 08:22:38,559 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:38,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-13 08:22:38,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-13 08:22:38,568 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 26 [2021-06-13 08:22:38,570 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 24 transitions, 54 flow. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) [2021-06-13 08:22:38,570 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:38,570 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 26 [2021-06-13 08:22:38,571 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:38,623 INFO L129 PetriNetUnfolder]: 22/75 cut-off events. [2021-06-13 08:22:38,624 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:38,624 INFO L84 FinitePrefix]: Finished finitePrefix Result has 128 conditions, 75 events. 22/75 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 203 event pairs, 4 based on Foata normal form. 15/86 useless extension candidates. Maximal degree in co-relation 117. Up to 30 conditions per place. [2021-06-13 08:22:38,625 INFO L132 encePairwiseOnDemand]: 15/26 looper letters, 7 selfloop transitions, 7 changer transitions 1/26 dead transitions. [2021-06-13 08:22:38,625 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 26 transitions, 88 flow [2021-06-13 08:22:38,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-13 08:22:38,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-06-13 08:22:38,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 66 transitions. [2021-06-13 08:22:38,635 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8461538461538461 [2021-06-13 08:22:38,635 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 66 transitions. [2021-06-13 08:22:38,636 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 66 transitions. [2021-06-13 08:22:38,636 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:38,637 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 66 transitions. [2021-06-13 08:22:38,639 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 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) [2021-06-13 08:22:38,642 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 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) [2021-06-13 08:22:38,642 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 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) [2021-06-13 08:22:38,643 INFO L185 Difference]: Start difference. First operand has 29 places, 24 transitions, 54 flow. Second operand 3 states and 66 transitions. [2021-06-13 08:22:38,644 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 26 transitions, 88 flow [2021-06-13 08:22:38,646 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 26 transitions, 86 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-13 08:22:38,649 INFO L241 Difference]: Finished difference. Result has 27 places, 25 transitions, 96 flow [2021-06-13 08:22:38,650 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=44, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=96, PETRI_PLACES=27, PETRI_TRANSITIONS=25} [2021-06-13 08:22:38,651 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, -2 predicate places. [2021-06-13 08:22:38,651 INFO L482 AbstractCegarLoop]: Abstraction has has 27 places, 25 transitions, 96 flow [2021-06-13 08:22:38,651 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) [2021-06-13 08:22:38,651 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:38,651 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:38,652 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-06-13 08:22:38,652 INFO L430 AbstractCegarLoop]: === Iteration 2 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:38,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:38,655 INFO L82 PathProgramCache]: Analyzing trace with hash 617375958, now seen corresponding path program 1 times [2021-06-13 08:22:38,655 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:38,656 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015103972] [2021-06-13 08:22:38,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:38,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:38,681 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,681 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:38,682 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,682 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,687 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,687 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,697 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,698 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:38,705 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,705 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:38,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:38,705 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:38,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015103972] [2021-06-13 08:22:38,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015103972] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:38,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:38,706 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-13 08:22:38,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657974936] [2021-06-13 08:22:38,706 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-13 08:22:38,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:38,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-13 08:22:38,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-13 08:22:38,708 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:38,708 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 25 transitions, 96 flow. Second operand has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 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) [2021-06-13 08:22:38,708 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:38,708 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:38,708 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:38,753 INFO L129 PetriNetUnfolder]: 51/151 cut-off events. [2021-06-13 08:22:38,753 INFO L130 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2021-06-13 08:22:38,754 INFO L84 FinitePrefix]: Finished finitePrefix Result has 355 conditions, 151 events. 51/151 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 464 event pairs, 11 based on Foata normal form. 5/153 useless extension candidates. Maximal degree in co-relation 341. Up to 55 conditions per place. [2021-06-13 08:22:38,755 INFO L132 encePairwiseOnDemand]: 19/26 looper letters, 13 selfloop transitions, 9 changer transitions 0/39 dead transitions. [2021-06-13 08:22:38,755 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 39 transitions, 168 flow [2021-06-13 08:22:38,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-06-13 08:22:38,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-06-13 08:22:38,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 103 transitions. [2021-06-13 08:22:38,756 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7923076923076923 [2021-06-13 08:22:38,757 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 103 transitions. [2021-06-13 08:22:38,757 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 103 transitions. [2021-06-13 08:22:38,757 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:38,757 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 103 transitions. [2021-06-13 08:22:38,757 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 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) [2021-06-13 08:22:38,758 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 26.0) internal successors, (156), 6 states have internal predecessors, (156), 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) [2021-06-13 08:22:38,758 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 26.0) internal successors, (156), 6 states have internal predecessors, (156), 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) [2021-06-13 08:22:38,758 INFO L185 Difference]: Start difference. First operand has 27 places, 25 transitions, 96 flow. Second operand 5 states and 103 transitions. [2021-06-13 08:22:38,758 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 39 transitions, 168 flow [2021-06-13 08:22:38,759 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 39 transitions, 154 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-13 08:22:38,760 INFO L241 Difference]: Finished difference. Result has 32 places, 31 transitions, 142 flow [2021-06-13 08:22:38,761 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=82, PETRI_DIFFERENCE_MINUEND_PLACES=24, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=142, PETRI_PLACES=32, PETRI_TRANSITIONS=31} [2021-06-13 08:22:38,761 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 3 predicate places. [2021-06-13 08:22:38,761 INFO L482 AbstractCegarLoop]: Abstraction has has 32 places, 31 transitions, 142 flow [2021-06-13 08:22:38,761 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 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) [2021-06-13 08:22:38,761 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:38,761 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:38,761 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-06-13 08:22:38,761 INFO L430 AbstractCegarLoop]: === Iteration 3 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:38,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:38,762 INFO L82 PathProgramCache]: Analyzing trace with hash 391107300, now seen corresponding path program 2 times [2021-06-13 08:22:38,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:38,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066232805] [2021-06-13 08:22:38,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:38,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:38,773 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,773 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:38,773 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,774 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,776 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,776 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,780 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,780 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:38,786 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,786 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:38,786 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:38,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:38,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066232805] [2021-06-13 08:22:38,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066232805] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:38,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:38,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-13 08:22:38,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713924813] [2021-06-13 08:22:38,787 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-13 08:22:38,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:38,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-13 08:22:38,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-13 08:22:38,788 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:38,788 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 31 transitions, 142 flow. Second operand has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 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) [2021-06-13 08:22:38,788 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:38,788 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:38,788 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:38,827 INFO L129 PetriNetUnfolder]: 56/175 cut-off events. [2021-06-13 08:22:38,827 INFO L130 PetriNetUnfolder]: For 107/116 co-relation queries the response was YES. [2021-06-13 08:22:38,828 INFO L84 FinitePrefix]: Finished finitePrefix Result has 471 conditions, 175 events. 56/175 cut-off events. For 107/116 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 635 event pairs, 15 based on Foata normal form. 8/176 useless extension candidates. Maximal degree in co-relation 451. Up to 65 conditions per place. [2021-06-13 08:22:38,829 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 16 selfloop transitions, 9 changer transitions 0/42 dead transitions. [2021-06-13 08:22:38,829 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 42 transitions, 242 flow [2021-06-13 08:22:38,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-06-13 08:22:38,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-06-13 08:22:38,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 117 transitions. [2021-06-13 08:22:38,830 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.75 [2021-06-13 08:22:38,830 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 117 transitions. [2021-06-13 08:22:38,830 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 117 transitions. [2021-06-13 08:22:38,831 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:38,831 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 117 transitions. [2021-06-13 08:22:38,831 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 19.5) internal successors, (117), 6 states have internal predecessors, (117), 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) [2021-06-13 08:22:38,832 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 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) [2021-06-13 08:22:38,832 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 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) [2021-06-13 08:22:38,832 INFO L185 Difference]: Start difference. First operand has 32 places, 31 transitions, 142 flow. Second operand 6 states and 117 transitions. [2021-06-13 08:22:38,832 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 42 transitions, 242 flow [2021-06-13 08:22:38,834 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 42 transitions, 242 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-06-13 08:22:38,834 INFO L241 Difference]: Finished difference. Result has 41 places, 38 transitions, 226 flow [2021-06-13 08:22:38,835 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=142, PETRI_DIFFERENCE_MINUEND_PLACES=32, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=31, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=226, PETRI_PLACES=41, PETRI_TRANSITIONS=38} [2021-06-13 08:22:38,835 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 12 predicate places. [2021-06-13 08:22:38,835 INFO L482 AbstractCegarLoop]: Abstraction has has 41 places, 38 transitions, 226 flow [2021-06-13 08:22:38,835 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 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) [2021-06-13 08:22:38,835 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:38,835 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:38,835 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-06-13 08:22:38,835 INFO L430 AbstractCegarLoop]: === Iteration 4 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:38,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:38,836 INFO L82 PathProgramCache]: Analyzing trace with hash -1120438928, now seen corresponding path program 1 times [2021-06-13 08:22:38,836 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:38,836 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318926202] [2021-06-13 08:22:38,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:38,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:38,852 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,852 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:38,853 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,853 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,856 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,856 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,859 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,859 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,863 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,864 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:38,870 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,871 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:38,871 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:38,871 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:38,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318926202] [2021-06-13 08:22:38,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [318926202] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:38,872 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:38,872 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-06-13 08:22:38,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375434217] [2021-06-13 08:22:38,872 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-13 08:22:38,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:38,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-13 08:22:38,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-06-13 08:22:38,873 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:38,873 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 41 places, 38 transitions, 226 flow. Second operand has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 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) [2021-06-13 08:22:38,873 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:38,873 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:38,873 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:38,919 INFO L129 PetriNetUnfolder]: 36/125 cut-off events. [2021-06-13 08:22:38,919 INFO L130 PetriNetUnfolder]: For 161/174 co-relation queries the response was YES. [2021-06-13 08:22:38,920 INFO L84 FinitePrefix]: Finished finitePrefix Result has 399 conditions, 125 events. 36/125 cut-off events. For 161/174 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 360 event pairs, 6 based on Foata normal form. 14/136 useless extension candidates. Maximal degree in co-relation 373. Up to 41 conditions per place. [2021-06-13 08:22:38,920 INFO L132 encePairwiseOnDemand]: 19/26 looper letters, 11 selfloop transitions, 18 changer transitions 0/46 dead transitions. [2021-06-13 08:22:38,920 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 47 places, 46 transitions, 324 flow [2021-06-13 08:22:38,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-13 08:22:38,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-06-13 08:22:38,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 136 transitions. [2021-06-13 08:22:38,921 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7472527472527473 [2021-06-13 08:22:38,922 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 136 transitions. [2021-06-13 08:22:38,922 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 136 transitions. [2021-06-13 08:22:38,922 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:38,922 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 136 transitions. [2021-06-13 08:22:38,922 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 19.428571428571427) internal successors, (136), 7 states have internal predecessors, (136), 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) [2021-06-13 08:22:38,923 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 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) [2021-06-13 08:22:38,923 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 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) [2021-06-13 08:22:38,923 INFO L185 Difference]: Start difference. First operand has 41 places, 38 transitions, 226 flow. Second operand 7 states and 136 transitions. [2021-06-13 08:22:38,923 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 47 places, 46 transitions, 324 flow [2021-06-13 08:22:38,925 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 47 places, 46 transitions, 316 flow, removed 4 selfloop flow, removed 0 redundant places. [2021-06-13 08:22:38,925 INFO L241 Difference]: Finished difference. Result has 48 places, 40 transitions, 275 flow [2021-06-13 08:22:38,926 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=218, PETRI_DIFFERENCE_MINUEND_PLACES=41, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=38, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=16, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=275, PETRI_PLACES=48, PETRI_TRANSITIONS=40} [2021-06-13 08:22:38,926 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 19 predicate places. [2021-06-13 08:22:38,926 INFO L482 AbstractCegarLoop]: Abstraction has has 48 places, 40 transitions, 275 flow [2021-06-13 08:22:38,926 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 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) [2021-06-13 08:22:38,926 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:38,926 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:38,926 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-06-13 08:22:38,926 INFO L430 AbstractCegarLoop]: === Iteration 5 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:38,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:38,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1026689604, now seen corresponding path program 2 times [2021-06-13 08:22:38,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:38,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087123898] [2021-06-13 08:22:38,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:38,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:38,938 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,938 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:38,938 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,939 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,941 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,941 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:38,944 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,944 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:38,950 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:38,950 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:38,951 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:38,951 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:38,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087123898] [2021-06-13 08:22:38,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087123898] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:38,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:38,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-13 08:22:38,951 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599871160] [2021-06-13 08:22:38,951 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-13 08:22:38,951 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:38,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-13 08:22:38,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-13 08:22:38,952 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:38,952 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 40 transitions, 275 flow. Second operand has 5 states, 5 states have (on average 17.8) internal successors, (89), 5 states have internal predecessors, (89), 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) [2021-06-13 08:22:38,952 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:38,952 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:38,952 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,006 INFO L129 PetriNetUnfolder]: 35/123 cut-off events. [2021-06-13 08:22:39,007 INFO L130 PetriNetUnfolder]: For 296/318 co-relation queries the response was YES. [2021-06-13 08:22:39,007 INFO L84 FinitePrefix]: Finished finitePrefix Result has 434 conditions, 123 events. 35/123 cut-off events. For 296/318 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 282 event pairs, 5 based on Foata normal form. 18/138 useless extension candidates. Maximal degree in co-relation 404. Up to 40 conditions per place. [2021-06-13 08:22:39,007 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 15 selfloop transitions, 15 changer transitions 0/47 dead transitions. [2021-06-13 08:22:39,008 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 52 places, 47 transitions, 373 flow [2021-06-13 08:22:39,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-06-13 08:22:39,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-06-13 08:22:39,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 101 transitions. [2021-06-13 08:22:39,015 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7769230769230769 [2021-06-13 08:22:39,015 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 101 transitions. [2021-06-13 08:22:39,015 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 101 transitions. [2021-06-13 08:22:39,015 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,015 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 101 transitions. [2021-06-13 08:22:39,015 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 20.2) internal successors, (101), 5 states have internal predecessors, (101), 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) [2021-06-13 08:22:39,016 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 26.0) internal successors, (156), 6 states have internal predecessors, (156), 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) [2021-06-13 08:22:39,016 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 26.0) internal successors, (156), 6 states have internal predecessors, (156), 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) [2021-06-13 08:22:39,016 INFO L185 Difference]: Start difference. First operand has 48 places, 40 transitions, 275 flow. Second operand 5 states and 101 transitions. [2021-06-13 08:22:39,016 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 52 places, 47 transitions, 373 flow [2021-06-13 08:22:39,018 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 46 places, 47 transitions, 324 flow, removed 6 selfloop flow, removed 6 redundant places. [2021-06-13 08:22:39,018 INFO L241 Difference]: Finished difference. Result has 47 places, 41 transitions, 275 flow [2021-06-13 08:22:39,019 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=233, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=14, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=26, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=275, PETRI_PLACES=47, PETRI_TRANSITIONS=41} [2021-06-13 08:22:39,019 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 18 predicate places. [2021-06-13 08:22:39,019 INFO L482 AbstractCegarLoop]: Abstraction has has 47 places, 41 transitions, 275 flow [2021-06-13 08:22:39,019 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 17.8) internal successors, (89), 5 states have internal predecessors, (89), 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) [2021-06-13 08:22:39,019 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:39,019 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:39,019 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-06-13 08:22:39,019 INFO L430 AbstractCegarLoop]: === Iteration 6 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:39,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:39,019 INFO L82 PathProgramCache]: Analyzing trace with hash -954834044, now seen corresponding path program 1 times [2021-06-13 08:22:39,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:39,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191279280] [2021-06-13 08:22:39,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:39,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:39,054 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,054 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,055 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,055 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,057 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,058 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,060 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,060 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,064 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,065 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:39,070 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,071 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,071 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:39,071 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:39,071 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191279280] [2021-06-13 08:22:39,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191279280] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:39,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:39,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-06-13 08:22:39,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926749611] [2021-06-13 08:22:39,072 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-13 08:22:39,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:39,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-13 08:22:39,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-06-13 08:22:39,073 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:39,073 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 47 places, 41 transitions, 275 flow. Second operand has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 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) [2021-06-13 08:22:39,073 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:39,073 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:39,073 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,104 INFO L129 PetriNetUnfolder]: 15/71 cut-off events. [2021-06-13 08:22:39,104 INFO L130 PetriNetUnfolder]: For 236/252 co-relation queries the response was YES. [2021-06-13 08:22:39,105 INFO L84 FinitePrefix]: Finished finitePrefix Result has 286 conditions, 71 events. 15/71 cut-off events. For 236/252 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 142 event pairs, 1 based on Foata normal form. 13/84 useless extension candidates. Maximal degree in co-relation 258. Up to 17 conditions per place. [2021-06-13 08:22:39,105 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 0 selfloop transitions, 0 changer transitions 42/42 dead transitions. [2021-06-13 08:22:39,105 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 52 places, 42 transitions, 360 flow [2021-06-13 08:22:39,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-13 08:22:39,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-06-13 08:22:39,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 134 transitions. [2021-06-13 08:22:39,106 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7362637362637363 [2021-06-13 08:22:39,106 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 134 transitions. [2021-06-13 08:22:39,106 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 134 transitions. [2021-06-13 08:22:39,106 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,106 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 134 transitions. [2021-06-13 08:22:39,106 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 19.142857142857142) internal successors, (134), 7 states have internal predecessors, (134), 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) [2021-06-13 08:22:39,107 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 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) [2021-06-13 08:22:39,107 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 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) [2021-06-13 08:22:39,107 INFO L185 Difference]: Start difference. First operand has 47 places, 41 transitions, 275 flow. Second operand 7 states and 134 transitions. [2021-06-13 08:22:39,107 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 52 places, 42 transitions, 360 flow [2021-06-13 08:22:39,109 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 48 places, 42 transitions, 333 flow, removed 5 selfloop flow, removed 4 redundant places. [2021-06-13 08:22:39,109 INFO L241 Difference]: Finished difference. Result has 48 places, 0 transitions, 0 flow [2021-06-13 08:22:39,109 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=221, PETRI_DIFFERENCE_MINUEND_PLACES=42, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=34, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=34, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=48, PETRI_TRANSITIONS=0} [2021-06-13 08:22:39,109 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 19 predicate places. [2021-06-13 08:22:39,109 INFO L482 AbstractCegarLoop]: Abstraction has has 48 places, 0 transitions, 0 flow [2021-06-13 08:22:39,110 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 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) [2021-06-13 08:22:39,110 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-06-13 08:22:39,110 INFO L301 ceAbstractionStarter]: Result for error location Process1Thread1of1ForFork1 was SAFE (4/5) [2021-06-13 08:22:39,111 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-13 08:22:39,111 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:39,111 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:39,111 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:39,111 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:39,111 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:39,111 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:39,111 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:39,111 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process0Thread1of1ForFork0======== [2021-06-13 08:22:39,112 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:39,113 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:39,113 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:39,113 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 24 events. 2/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 45 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 22. Up to 2 conditions per place. [2021-06-13 08:22:39,113 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:39,113 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 24 transitions, 54 flow [2021-06-13 08:22:39,114 INFO L129 PetriNetUnfolder]: 0/15 cut-off events. [2021-06-13 08:22:39,114 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:39,114 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:39,114 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:39,114 INFO L430 AbstractCegarLoop]: === Iteration 1 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:39,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:39,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1948731573, now seen corresponding path program 1 times [2021-06-13 08:22:39,115 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:39,115 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153625682] [2021-06-13 08:22:39,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:39,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:39,121 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,121 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,121 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,122 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,124 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,124 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:39,129 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,129 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:39,129 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:39,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153625682] [2021-06-13 08:22:39,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153625682] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:39,130 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:39,130 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-13 08:22:39,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182859253] [2021-06-13 08:22:39,130 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-13 08:22:39,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:39,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-13 08:22:39,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-13 08:22:39,131 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:39,131 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 24 transitions, 54 flow. Second operand has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 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) [2021-06-13 08:22:39,131 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:39,131 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:39,131 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,147 INFO L129 PetriNetUnfolder]: 17/73 cut-off events. [2021-06-13 08:22:39,147 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:39,147 INFO L84 FinitePrefix]: Finished finitePrefix Result has 118 conditions, 73 events. 17/73 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 236 event pairs, 4 based on Foata normal form. 3/66 useless extension candidates. Maximal degree in co-relation 106. Up to 25 conditions per place. [2021-06-13 08:22:39,147 INFO L132 encePairwiseOnDemand]: 19/26 looper letters, 11 selfloop transitions, 6 changer transitions 0/29 dead transitions. [2021-06-13 08:22:39,147 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 28 places, 29 transitions, 98 flow [2021-06-13 08:22:39,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-13 08:22:39,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-06-13 08:22:39,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 87 transitions. [2021-06-13 08:22:39,148 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8365384615384616 [2021-06-13 08:22:39,148 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 87 transitions. [2021-06-13 08:22:39,148 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 87 transitions. [2021-06-13 08:22:39,148 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,148 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 87 transitions. [2021-06-13 08:22:39,149 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 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) [2021-06-13 08:22:39,149 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 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) [2021-06-13 08:22:39,149 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 26.0) internal successors, (130), 5 states have internal predecessors, (130), 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) [2021-06-13 08:22:39,149 INFO L185 Difference]: Start difference. First operand has 29 places, 24 transitions, 54 flow. Second operand 4 states and 87 transitions. [2021-06-13 08:22:39,149 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 28 places, 29 transitions, 98 flow [2021-06-13 08:22:39,149 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 26 places, 29 transitions, 96 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-13 08:22:39,150 INFO L241 Difference]: Finished difference. Result has 28 places, 25 transitions, 82 flow [2021-06-13 08:22:39,150 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=44, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=82, PETRI_PLACES=28, PETRI_TRANSITIONS=25} [2021-06-13 08:22:39,150 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, -1 predicate places. [2021-06-13 08:22:39,150 INFO L482 AbstractCegarLoop]: Abstraction has has 28 places, 25 transitions, 82 flow [2021-06-13 08:22:39,150 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 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) [2021-06-13 08:22:39,150 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:39,150 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:39,151 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-06-13 08:22:39,151 INFO L430 AbstractCegarLoop]: === Iteration 2 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:39,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:39,151 INFO L82 PathProgramCache]: Analyzing trace with hash 125873225, now seen corresponding path program 1 times [2021-06-13 08:22:39,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:39,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892692950] [2021-06-13 08:22:39,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:39,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:39,157 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,157 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:39,159 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:39,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892692950] [2021-06-13 08:22:39,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892692950] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:39,160 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:39,160 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-06-13 08:22:39,160 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883583234] [2021-06-13 08:22:39,160 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-13 08:22:39,160 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:39,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-13 08:22:39,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-13 08:22:39,161 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 26 [2021-06-13 08:22:39,161 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 25 transitions, 82 flow. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) [2021-06-13 08:22:39,161 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:39,161 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 26 [2021-06-13 08:22:39,161 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,175 INFO L129 PetriNetUnfolder]: 37/124 cut-off events. [2021-06-13 08:22:39,175 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-06-13 08:22:39,175 INFO L84 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 124 events. 37/124 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 19. Compared 486 event pairs, 8 based on Foata normal form. 0/119 useless extension candidates. Maximal degree in co-relation 239. Up to 49 conditions per place. [2021-06-13 08:22:39,176 INFO L132 encePairwiseOnDemand]: 17/26 looper letters, 7 selfloop transitions, 7 changer transitions 1/31 dead transitions. [2021-06-13 08:22:39,176 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 31 transitions, 124 flow [2021-06-13 08:22:39,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-13 08:22:39,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-06-13 08:22:39,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 62 transitions. [2021-06-13 08:22:39,177 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7948717948717948 [2021-06-13 08:22:39,177 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 62 transitions. [2021-06-13 08:22:39,177 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 62 transitions. [2021-06-13 08:22:39,177 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,177 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 62 transitions. [2021-06-13 08:22:39,177 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 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) [2021-06-13 08:22:39,177 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 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) [2021-06-13 08:22:39,178 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 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) [2021-06-13 08:22:39,178 INFO L185 Difference]: Start difference. First operand has 28 places, 25 transitions, 82 flow. Second operand 3 states and 62 transitions. [2021-06-13 08:22:39,178 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 31 transitions, 124 flow [2021-06-13 08:22:39,178 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 31 transitions, 124 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-06-13 08:22:39,179 INFO L241 Difference]: Finished difference. Result has 32 places, 30 transitions, 134 flow [2021-06-13 08:22:39,179 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=82, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=25, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=18, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=134, PETRI_PLACES=32, PETRI_TRANSITIONS=30} [2021-06-13 08:22:39,179 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 3 predicate places. [2021-06-13 08:22:39,179 INFO L482 AbstractCegarLoop]: Abstraction has has 32 places, 30 transitions, 134 flow [2021-06-13 08:22:39,179 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 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) [2021-06-13 08:22:39,179 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:39,179 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:39,179 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-06-13 08:22:39,179 INFO L430 AbstractCegarLoop]: === Iteration 3 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:39,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:39,180 INFO L82 PathProgramCache]: Analyzing trace with hash 391474269, now seen corresponding path program 1 times [2021-06-13 08:22:39,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:39,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208334027] [2021-06-13 08:22:39,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:39,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:39,187 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,187 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,188 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,188 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,190 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,190 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,193 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,194 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:39,199 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,200 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:39,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:39,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208334027] [2021-06-13 08:22:39,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208334027] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:39,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:39,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-13 08:22:39,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423363603] [2021-06-13 08:22:39,201 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-13 08:22:39,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:39,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-13 08:22:39,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-13 08:22:39,201 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:39,202 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 30 transitions, 134 flow. Second operand has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 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) [2021-06-13 08:22:39,202 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:39,202 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:39,202 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,231 INFO L129 PetriNetUnfolder]: 53/159 cut-off events. [2021-06-13 08:22:39,231 INFO L130 PetriNetUnfolder]: For 40/44 co-relation queries the response was YES. [2021-06-13 08:22:39,232 INFO L84 FinitePrefix]: Finished finitePrefix Result has 430 conditions, 159 events. 53/159 cut-off events. For 40/44 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 416 event pairs, 13 based on Foata normal form. 10/164 useless extension candidates. Maximal degree in co-relation 412. Up to 58 conditions per place. [2021-06-13 08:22:39,232 INFO L132 encePairwiseOnDemand]: 19/26 looper letters, 11 selfloop transitions, 14 changer transitions 0/42 dead transitions. [2021-06-13 08:22:39,233 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 36 places, 42 transitions, 224 flow [2021-06-13 08:22:39,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-06-13 08:22:39,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2021-06-13 08:22:39,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 119 transitions. [2021-06-13 08:22:39,233 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7628205128205128 [2021-06-13 08:22:39,233 INFO L72 ComplementDD]: Start complementDD. Operand 6 states and 119 transitions. [2021-06-13 08:22:39,233 INFO L73 IsDeterministic]: Start isDeterministic. Operand 6 states and 119 transitions. [2021-06-13 08:22:39,234 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,234 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 6 states and 119 transitions. [2021-06-13 08:22:39,234 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 7 states, 6 states have (on average 19.833333333333332) internal successors, (119), 6 states have internal predecessors, (119), 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) [2021-06-13 08:22:39,234 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 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) [2021-06-13 08:22:39,234 INFO L81 ComplementDD]: Finished complementDD. Result has 7 states, 7 states have (on average 26.0) internal successors, (182), 7 states have internal predecessors, (182), 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) [2021-06-13 08:22:39,234 INFO L185 Difference]: Start difference. First operand has 32 places, 30 transitions, 134 flow. Second operand 6 states and 119 transitions. [2021-06-13 08:22:39,234 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 36 places, 42 transitions, 224 flow [2021-06-13 08:22:39,235 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 34 places, 42 transitions, 210 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-13 08:22:39,236 INFO L241 Difference]: Finished difference. Result has 38 places, 38 transitions, 211 flow [2021-06-13 08:22:39,236 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=120, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=8, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=6, PETRI_FLOW=211, PETRI_PLACES=38, PETRI_TRANSITIONS=38} [2021-06-13 08:22:39,236 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 9 predicate places. [2021-06-13 08:22:39,236 INFO L482 AbstractCegarLoop]: Abstraction has has 38 places, 38 transitions, 211 flow [2021-06-13 08:22:39,236 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 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) [2021-06-13 08:22:39,236 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:39,236 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:39,236 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-06-13 08:22:39,236 INFO L430 AbstractCegarLoop]: === Iteration 4 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:39,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:39,237 INFO L82 PathProgramCache]: Analyzing trace with hash 617384877, now seen corresponding path program 2 times [2021-06-13 08:22:39,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:39,237 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856626624] [2021-06-13 08:22:39,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:39,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:39,243 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,244 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,244 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,244 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,246 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,247 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,250 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,255 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:39,262 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,262 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:39,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:39,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856626624] [2021-06-13 08:22:39,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [856626624] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:39,263 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:39,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-13 08:22:39,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395101738] [2021-06-13 08:22:39,263 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-13 08:22:39,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:39,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-13 08:22:39,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-13 08:22:39,264 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:39,264 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 38 places, 38 transitions, 211 flow. Second operand has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 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) [2021-06-13 08:22:39,264 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:39,264 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:39,264 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,302 INFO L129 PetriNetUnfolder]: 58/188 cut-off events. [2021-06-13 08:22:39,302 INFO L130 PetriNetUnfolder]: For 174/178 co-relation queries the response was YES. [2021-06-13 08:22:39,303 INFO L84 FinitePrefix]: Finished finitePrefix Result has 551 conditions, 188 events. 58/188 cut-off events. For 174/178 co-relation queries the response was YES. Maximal size of possible extension queue 18. Compared 694 event pairs, 11 based on Foata normal form. 9/191 useless extension candidates. Maximal degree in co-relation 529. Up to 66 conditions per place. [2021-06-13 08:22:39,304 INFO L132 encePairwiseOnDemand]: 19/26 looper letters, 15 selfloop transitions, 16 changer transitions 0/48 dead transitions. [2021-06-13 08:22:39,304 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 42 places, 48 transitions, 319 flow [2021-06-13 08:22:39,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-06-13 08:22:39,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-06-13 08:22:39,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 103 transitions. [2021-06-13 08:22:39,305 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7923076923076923 [2021-06-13 08:22:39,305 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 103 transitions. [2021-06-13 08:22:39,305 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 103 transitions. [2021-06-13 08:22:39,305 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,305 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 103 transitions. [2021-06-13 08:22:39,305 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 20.6) internal successors, (103), 5 states have internal predecessors, (103), 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) [2021-06-13 08:22:39,306 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 26.0) internal successors, (156), 6 states have internal predecessors, (156), 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) [2021-06-13 08:22:39,306 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 26.0) internal successors, (156), 6 states have internal predecessors, (156), 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) [2021-06-13 08:22:39,306 INFO L185 Difference]: Start difference. First operand has 38 places, 38 transitions, 211 flow. Second operand 5 states and 103 transitions. [2021-06-13 08:22:39,306 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 42 places, 48 transitions, 319 flow [2021-06-13 08:22:39,307 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 48 transitions, 308 flow, removed 4 selfloop flow, removed 1 redundant places. [2021-06-13 08:22:39,309 INFO L241 Difference]: Finished difference. Result has 45 places, 41 transitions, 290 flow [2021-06-13 08:22:39,309 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=188, PETRI_DIFFERENCE_MINUEND_PLACES=37, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=11, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=290, PETRI_PLACES=45, PETRI_TRANSITIONS=41} [2021-06-13 08:22:39,309 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 16 predicate places. [2021-06-13 08:22:39,309 INFO L482 AbstractCegarLoop]: Abstraction has has 45 places, 41 transitions, 290 flow [2021-06-13 08:22:39,309 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 5 states have internal predecessors, (86), 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) [2021-06-13 08:22:39,309 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:39,310 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:39,310 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-06-13 08:22:39,310 INFO L430 AbstractCegarLoop]: === Iteration 5 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:39,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:39,310 INFO L82 PathProgramCache]: Analyzing trace with hash -620211087, now seen corresponding path program 1 times [2021-06-13 08:22:39,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:39,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612808821] [2021-06-13 08:22:39,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:39,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:39,327 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,327 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,328 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,328 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,330 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,331 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,334 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,334 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,338 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,339 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:39,345 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,346 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:39,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:39,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612808821] [2021-06-13 08:22:39,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612808821] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:39,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:39,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-06-13 08:22:39,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557196637] [2021-06-13 08:22:39,347 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-13 08:22:39,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:39,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-13 08:22:39,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-06-13 08:22:39,347 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:39,348 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 45 places, 41 transitions, 290 flow. Second operand has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 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) [2021-06-13 08:22:39,348 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:39,348 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:39,348 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,387 INFO L129 PetriNetUnfolder]: 38/139 cut-off events. [2021-06-13 08:22:39,387 INFO L130 PetriNetUnfolder]: For 342/350 co-relation queries the response was YES. [2021-06-13 08:22:39,388 INFO L84 FinitePrefix]: Finished finitePrefix Result has 510 conditions, 139 events. 38/139 cut-off events. For 342/350 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 413 event pairs, 6 based on Foata normal form. 10/146 useless extension candidates. Maximal degree in co-relation 481. Up to 45 conditions per place. [2021-06-13 08:22:39,388 INFO L132 encePairwiseOnDemand]: 19/26 looper letters, 11 selfloop transitions, 21 changer transitions 0/49 dead transitions. [2021-06-13 08:22:39,388 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 51 places, 49 transitions, 404 flow [2021-06-13 08:22:39,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-13 08:22:39,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-06-13 08:22:39,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 136 transitions. [2021-06-13 08:22:39,389 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7472527472527473 [2021-06-13 08:22:39,389 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 136 transitions. [2021-06-13 08:22:39,389 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 136 transitions. [2021-06-13 08:22:39,390 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,390 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 136 transitions. [2021-06-13 08:22:39,390 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 19.428571428571427) internal successors, (136), 7 states have internal predecessors, (136), 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) [2021-06-13 08:22:39,390 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 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) [2021-06-13 08:22:39,390 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 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) [2021-06-13 08:22:39,390 INFO L185 Difference]: Start difference. First operand has 45 places, 41 transitions, 290 flow. Second operand 7 states and 136 transitions. [2021-06-13 08:22:39,391 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 51 places, 49 transitions, 404 flow [2021-06-13 08:22:39,392 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 49 transitions, 387 flow, removed 6 selfloop flow, removed 1 redundant places. [2021-06-13 08:22:39,392 INFO L241 Difference]: Finished difference. Result has 51 places, 43 transitions, 342 flow [2021-06-13 08:22:39,393 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=277, PETRI_DIFFERENCE_MINUEND_PLACES=44, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=41, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=19, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=342, PETRI_PLACES=51, PETRI_TRANSITIONS=43} [2021-06-13 08:22:39,393 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 22 predicate places. [2021-06-13 08:22:39,393 INFO L482 AbstractCegarLoop]: Abstraction has has 51 places, 43 transitions, 342 flow [2021-06-13 08:22:39,393 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 17.5) internal successors, (105), 6 states have internal predecessors, (105), 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) [2021-06-13 08:22:39,393 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:39,393 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:39,393 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-06-13 08:22:39,393 INFO L430 AbstractCegarLoop]: === Iteration 6 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:39,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:39,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1026698523, now seen corresponding path program 2 times [2021-06-13 08:22:39,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:39,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107887773] [2021-06-13 08:22:39,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:39,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:39,412 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,412 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,412 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,413 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,441 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,441 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,445 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,445 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:39,450 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,451 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:39,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:39,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107887773] [2021-06-13 08:22:39,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107887773] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:39,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:39,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-13 08:22:39,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920800506] [2021-06-13 08:22:39,452 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-13 08:22:39,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:39,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-13 08:22:39,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-13 08:22:39,452 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:39,452 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 51 places, 43 transitions, 342 flow. Second operand has 5 states, 5 states have (on average 17.8) internal successors, (89), 5 states have internal predecessors, (89), 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) [2021-06-13 08:22:39,452 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:39,452 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:39,452 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,482 INFO L129 PetriNetUnfolder]: 36/134 cut-off events. [2021-06-13 08:22:39,482 INFO L130 PetriNetUnfolder]: For 481/496 co-relation queries the response was YES. [2021-06-13 08:22:39,483 INFO L84 FinitePrefix]: Finished finitePrefix Result has 520 conditions, 134 events. 36/134 cut-off events. For 481/496 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 361 event pairs, 5 based on Foata normal form. 13/144 useless extension candidates. Maximal degree in co-relation 488. Up to 43 conditions per place. [2021-06-13 08:22:39,483 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 17 selfloop transitions, 16 changer transitions 0/50 dead transitions. [2021-06-13 08:22:39,483 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 50 transitions, 452 flow [2021-06-13 08:22:39,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-06-13 08:22:39,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-06-13 08:22:39,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 101 transitions. [2021-06-13 08:22:39,484 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7769230769230769 [2021-06-13 08:22:39,484 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 101 transitions. [2021-06-13 08:22:39,484 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 101 transitions. [2021-06-13 08:22:39,484 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,484 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 101 transitions. [2021-06-13 08:22:39,484 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 20.2) internal successors, (101), 5 states have internal predecessors, (101), 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) [2021-06-13 08:22:39,485 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 26.0) internal successors, (156), 6 states have internal predecessors, (156), 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) [2021-06-13 08:22:39,485 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 26.0) internal successors, (156), 6 states have internal predecessors, (156), 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) [2021-06-13 08:22:39,485 INFO L185 Difference]: Start difference. First operand has 51 places, 43 transitions, 342 flow. Second operand 5 states and 101 transitions. [2021-06-13 08:22:39,485 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 50 transitions, 452 flow [2021-06-13 08:22:39,487 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 50 transitions, 395 flow, removed 7 selfloop flow, removed 6 redundant places. [2021-06-13 08:22:39,488 INFO L241 Difference]: Finished difference. Result has 50 places, 44 transitions, 338 flow [2021-06-13 08:22:39,488 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=292, PETRI_DIFFERENCE_MINUEND_PLACES=45, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=43, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=15, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=338, PETRI_PLACES=50, PETRI_TRANSITIONS=44} [2021-06-13 08:22:39,488 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 21 predicate places. [2021-06-13 08:22:39,488 INFO L482 AbstractCegarLoop]: Abstraction has has 50 places, 44 transitions, 338 flow [2021-06-13 08:22:39,488 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 17.8) internal successors, (89), 5 states have internal predecessors, (89), 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) [2021-06-13 08:22:39,488 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:39,488 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:39,488 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-06-13 08:22:39,488 INFO L430 AbstractCegarLoop]: === Iteration 7 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:39,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:39,488 INFO L82 PathProgramCache]: Analyzing trace with hash -941522405, now seen corresponding path program 1 times [2021-06-13 08:22:39,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:39,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623804575] [2021-06-13 08:22:39,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:39,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:39,515 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,515 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,516 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,516 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,518 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,519 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,521 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,522 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:39,525 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,526 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-06-13 08:22:39,532 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:39,532 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:39,532 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:39,532 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:39,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623804575] [2021-06-13 08:22:39,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623804575] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:39,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:39,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-06-13 08:22:39,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319661033] [2021-06-13 08:22:39,533 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-13 08:22:39,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:39,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-13 08:22:39,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-06-13 08:22:39,533 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-06-13 08:22:39,533 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 50 places, 44 transitions, 338 flow. Second operand has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 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) [2021-06-13 08:22:39,534 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:39,534 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-06-13 08:22:39,534 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:39,565 INFO L129 PetriNetUnfolder]: 17/85 cut-off events. [2021-06-13 08:22:39,565 INFO L130 PetriNetUnfolder]: For 358/370 co-relation queries the response was YES. [2021-06-13 08:22:39,566 INFO L84 FinitePrefix]: Finished finitePrefix Result has 366 conditions, 85 events. 17/85 cut-off events. For 358/370 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 173 event pairs, 1 based on Foata normal form. 11/96 useless extension candidates. Maximal degree in co-relation 336. Up to 21 conditions per place. [2021-06-13 08:22:39,566 INFO L132 encePairwiseOnDemand]: 20/26 looper letters, 0 selfloop transitions, 0 changer transitions 45/45 dead transitions. [2021-06-13 08:22:39,566 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 45 transitions, 435 flow [2021-06-13 08:22:39,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-13 08:22:39,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2021-06-13 08:22:39,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 134 transitions. [2021-06-13 08:22:39,567 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7362637362637363 [2021-06-13 08:22:39,567 INFO L72 ComplementDD]: Start complementDD. Operand 7 states and 134 transitions. [2021-06-13 08:22:39,567 INFO L73 IsDeterministic]: Start isDeterministic. Operand 7 states and 134 transitions. [2021-06-13 08:22:39,567 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:39,567 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 7 states and 134 transitions. [2021-06-13 08:22:39,567 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 8 states, 7 states have (on average 19.142857142857142) internal successors, (134), 7 states have internal predecessors, (134), 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) [2021-06-13 08:22:39,567 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 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) [2021-06-13 08:22:39,568 INFO L81 ComplementDD]: Finished complementDD. Result has 8 states, 8 states have (on average 26.0) internal successors, (208), 8 states have internal predecessors, (208), 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) [2021-06-13 08:22:39,568 INFO L185 Difference]: Start difference. First operand has 50 places, 44 transitions, 338 flow. Second operand 7 states and 134 transitions. [2021-06-13 08:22:39,568 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 45 transitions, 435 flow [2021-06-13 08:22:39,569 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 52 places, 45 transitions, 411 flow, removed 5 selfloop flow, removed 3 redundant places. [2021-06-13 08:22:39,569 INFO L241 Difference]: Finished difference. Result has 52 places, 0 transitions, 0 flow [2021-06-13 08:22:39,569 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=286, PETRI_DIFFERENCE_MINUEND_PLACES=46, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=37, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=37, PETRI_DIFFERENCE_SUBTRAHEND_STATES=7, PETRI_FLOW=0, PETRI_PLACES=52, PETRI_TRANSITIONS=0} [2021-06-13 08:22:39,569 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 23 predicate places. [2021-06-13 08:22:39,569 INFO L482 AbstractCegarLoop]: Abstraction has has 52 places, 0 transitions, 0 flow [2021-06-13 08:22:39,569 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 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) [2021-06-13 08:22:39,570 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-06-13 08:22:39,570 INFO L301 ceAbstractionStarter]: Result for error location Process0Thread1of1ForFork0 was SAFE (5/5) [2021-06-13 08:22:39,570 INFO L247 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2021-06-13 08:22:39,572 INFO L202 PluginConnector]: Adding new model Bakery.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.06 08:22:39 BasicIcfg [2021-06-13 08:22:39,572 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-06-13 08:22:39,573 INFO L168 Benchmark]: Toolchain (without parser) took 1531.53 ms. Allocated memory was 208.7 MB in the beginning and 250.6 MB in the end (delta: 41.9 MB). Free memory was 189.1 MB in the beginning and 200.0 MB in the end (delta: -10.9 MB). Peak memory consumption was 32.1 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:39,573 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.08 ms. Allocated memory is still 208.7 MB. Free memory is still 190.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-06-13 08:22:39,573 INFO L168 Benchmark]: Boogie Procedure Inliner took 18.51 ms. Allocated memory is still 208.7 MB. Free memory was 189.1 MB in the beginning and 187.5 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:39,573 INFO L168 Benchmark]: Boogie Preprocessor took 11.68 ms. Allocated memory is still 208.7 MB. Free memory was 187.5 MB in the beginning and 186.6 MB in the end (delta: 980.8 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:39,573 INFO L168 Benchmark]: RCFGBuilder took 177.72 ms. Allocated memory is still 208.7 MB. Free memory was 186.6 MB in the beginning and 176.4 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:39,574 INFO L168 Benchmark]: TraceAbstraction took 1319.72 ms. Allocated memory was 208.7 MB in the beginning and 250.6 MB in the end (delta: 41.9 MB). Free memory was 175.9 MB in the beginning and 200.0 MB in the end (delta: -24.0 MB). Peak memory consumption was 18.4 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:39,574 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 0.08 ms. Allocated memory is still 208.7 MB. Free memory is still 190.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 18.51 ms. Allocated memory is still 208.7 MB. Free memory was 189.1 MB in the beginning and 187.5 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 11.68 ms. Allocated memory is still 208.7 MB. Free memory was 187.5 MB in the beginning and 186.6 MB in the end (delta: 980.8 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 177.72 ms. Allocated memory is still 208.7 MB. Free memory was 186.6 MB in the beginning and 176.4 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1319.72 ms. Allocated memory was 208.7 MB in the beginning and 250.6 MB in the end (delta: 41.9 MB). Free memory was 175.9 MB in the beginning and 200.0 MB in the end (delta: -24.0 MB). Peak memory consumption was 18.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 38]: assertion always holds For all program executions holds that assertion always holds at this location - PositiveResult [Line: 53]: assertion always holds For all program executions holds that assertion always holds at this location - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process0 with 1 thread instances CFG has 5 procedures, 45 locations, 6 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 0.2ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 33.7ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 0.0ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 28.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=0occurred in iteration=0, InterpolantAutomatonStates: 0, 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: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process1 with 1 thread instances CFG has 5 procedures, 45 locations, 6 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 0.1ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 14.7ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 0.0ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 8.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=0occurred in iteration=0, InterpolantAutomatonStates: 0, 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: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: ULTIMATE.start with 1 thread instances CFG has 5 procedures, 45 locations, 6 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 0.1ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 13.0ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 0.0ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.5ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=0occurred in iteration=0, InterpolantAutomatonStates: 0, 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: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process1Thread1of1ForFork1 with 1 thread instances CFG has 5 procedures, 45 locations, 6 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 9.0ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 697.9ms, OverallIterations: 6, TraceHistogramMax: 2, EmptinessCheckTime: 0.0ms, AutomataDifference: 345.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 11.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 37 SDtfs, 59 SDslu, 26 SDs, 0 SdLazy, 124 SolverSat, 30 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 103.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 120.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=275occurred in iteration=4, InterpolantAutomatonStates: 33, 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: 9.3ms SsaConstructionTime, 28.2ms SatisfiabilityAnalysisTime, 201.4ms InterpolantComputationTime, 92 NumberOfCodeBlocks, 92 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 86 ConstructedInterpolants, 0 QuantifiedInterpolants, 212 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 6 PerfectInterpolantSequences, 13/13 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 - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process0Thread1of1ForFork0 with 1 thread instances CFG has 5 procedures, 45 locations, 6 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 0.7ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 458.6ms, OverallIterations: 7, TraceHistogramMax: 2, EmptinessCheckTime: 0.0ms, AutomataDifference: 237.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 2.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 47 SDtfs, 65 SDslu, 29 SDs, 0 SdLazy, 138 SolverSat, 31 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 75.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 124.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=342occurred in iteration=5, InterpolantAutomatonStates: 37, 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: 4.1ms SsaConstructionTime, 30.8ms SatisfiabilityAnalysisTime, 161.3ms InterpolantComputationTime, 100 NumberOfCodeBlocks, 100 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 93 ConstructedInterpolants, 0 QuantifiedInterpolants, 237 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 7 PerfectInterpolantSequences, 15/15 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 2 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...