/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/Peterson.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-9bbddad6b14272d9691b7fb6f1c011d15ab18596-9bbddad [2021-06-13 08:22:55,333 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-13 08:22:55,335 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-13 08:22:55,355 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-06-13 08:22:55,393 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 08:22:55,440 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-13 08:22:55,440 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-13 08:22:55,442 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-13 08:22:55,442 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-13 08:22:55,442 INFO L138 SettingsManager]: * Use SBE=true [2021-06-13 08:22:55,442 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-13 08:22:55,442 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-13 08:22:55,443 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-13 08:22:55,443 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-13 08:22:55,443 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-13 08:22:55,443 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-13 08:22:55,443 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-13 08:22:55,444 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-13 08:22:55,444 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-13 08:22:55,445 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-13 08:22:55,445 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-13 08:22:55,445 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-13 08:22:55,445 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-13 08:22:55,445 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-13 08:22:55,445 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-13 08:22:55,445 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-06-13 08:22:55,445 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-13 08:22:55,667 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-13 08:22:55,679 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-13 08:22:55,680 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-13 08:22:55,681 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-13 08:22:55,681 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-13 08:22:55,682 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/showcase/Peterson.bpl [2021-06-13 08:22:55,682 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/showcase/Peterson.bpl' [2021-06-13 08:22:55,705 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-13 08:22:55,706 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-13 08:22:55,707 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-13 08:22:55,707 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-13 08:22:55,707 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-13 08:22:55,714 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,718 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,722 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-13 08:22:55,723 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-13 08:22:55,723 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-13 08:22:55,723 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-13 08:22:55,728 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,728 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,728 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,729 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,730 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,732 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,732 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/1) ... [2021-06-13 08:22:55,733 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-13 08:22:55,733 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-13 08:22:55,733 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-13 08:22:55,733 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-13 08:22:55,734 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (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 08:22:55,783 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Process0 given in one single declaration [2021-06-13 08:22:55,783 INFO L130 BoogieDeclarations]: Found specification of procedure Process0 [2021-06-13 08:22:55,784 INFO L138 BoogieDeclarations]: Found implementation of procedure Process0 [2021-06-13 08:22:55,784 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Process1 given in one single declaration [2021-06-13 08:22:55,784 INFO L130 BoogieDeclarations]: Found specification of procedure Process1 [2021-06-13 08:22:55,784 INFO L138 BoogieDeclarations]: Found implementation of procedure Process1 [2021-06-13 08:22:55,784 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-06-13 08:22:55,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-13 08:22:55,784 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-13 08:22:55,785 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 08:22:55,878 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-13 08:22:55,879 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-06-13 08:22:55,880 INFO L202 PluginConnector]: Adding new model Peterson.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.06 08:22:55 BoogieIcfgContainer [2021-06-13 08:22:55,880 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-13 08:22:55,881 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-13 08:22:55,881 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-13 08:22:55,883 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-13 08:22:55,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Peterson.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:55" (1/2) ... [2021-06-13 08:22:55,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@380356cc and model type Peterson.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.06 08:22:55, skipping insertion in model container [2021-06-13 08:22:55,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Peterson.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.06 08:22:55" (2/2) ... [2021-06-13 08:22:55,885 INFO L111 eAbstractionObserver]: Analyzing ICFG Peterson.bpl [2021-06-13 08:22:55,888 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-13 08:22:55,888 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-06-13 08:22:55,905 INFO L471 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-13 08:22:55,927 WARN L313 ript$VariableManager]: TermVariabe Process0Thread1of1ForFork0_x not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:55,927 WARN L313 ript$VariableManager]: TermVariabe Process0Thread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:55,940 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_a not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:55,941 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_b not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:55,942 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-13 08:22:55,955 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-13 08:22:55,981 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:55,981 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:55,981 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:55,981 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:55,981 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:55,981 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:55,981 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:55,981 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process0======== [2021-06-13 08:22:55,987 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,013 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:56,014 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,017 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 5. Compared 47 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 24. Up to 2 conditions per place. [2021-06-13 08:22:56,018 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,019 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 0 places, 0 transitions, 0 flow [2021-06-13 08:22:56,019 INFO L129 PetriNetUnfolder]: 0/0 cut-off events. [2021-06-13 08:22:56,020 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,020 INFO L301 ceAbstractionStarter]: Result for error location Process0 was SAFE (1/5) [2021-06-13 08:22:56,021 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-13 08:22:56,032 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:56,032 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:56,032 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:56,033 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:56,033 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:56,033 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:56,033 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:56,033 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process1======== [2021-06-13 08:22:56,034 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,037 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:56,038 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,038 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 5. Compared 47 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 24. Up to 2 conditions per place. [2021-06-13 08:22:56,038 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,038 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 0 places, 0 transitions, 0 flow [2021-06-13 08:22:56,038 INFO L129 PetriNetUnfolder]: 0/0 cut-off events. [2021-06-13 08:22:56,038 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,039 INFO L301 ceAbstractionStarter]: Result for error location Process1 was SAFE (2/5) [2021-06-13 08:22:56,039 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-06-13 08:22:56,040 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:56,040 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:56,040 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:56,040 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:56,040 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:56,040 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:56,041 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:56,041 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-06-13 08:22:56,042 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,045 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:56,045 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,045 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 5. Compared 47 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 24. Up to 2 conditions per place. [2021-06-13 08:22:56,045 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,046 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 0 places, 0 transitions, 0 flow [2021-06-13 08:22:56,046 INFO L129 PetriNetUnfolder]: 0/0 cut-off events. [2021-06-13 08:22:56,046 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,046 INFO L301 ceAbstractionStarter]: Result for error location ULTIMATE.start was SAFE (3/5) [2021-06-13 08:22:56,046 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-13 08:22:56,047 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:56,047 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:56,047 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:56,047 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:56,047 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:56,048 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:56,048 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:56,048 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process1Thread1of1ForFork1======== [2021-06-13 08:22:56,049 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,053 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:56,053 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,053 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 5. Compared 47 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 24. Up to 2 conditions per place. [2021-06-13 08:22:56,054 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,055 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 24 transitions, 54 flow [2021-06-13 08:22:56,058 INFO L129 PetriNetUnfolder]: 0/16 cut-off events. [2021-06-13 08:22:56,058 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,058 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:56,058 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:56,058 INFO L430 AbstractCegarLoop]: === Iteration 1 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:56,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:56,061 INFO L82 PathProgramCache]: Analyzing trace with hash 206120117, now seen corresponding path program 1 times [2021-06-13 08:22:56,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:56,067 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [182502509] [2021-06-13 08:22:56,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:56,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:56,136 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,137 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:56,149 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 08:22:56,149 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:56,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [182502509] [2021-06-13 08:22:56,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [182502509] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:56,150 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:56,150 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-06-13 08:22:56,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133792255] [2021-06-13 08:22:56,155 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-13 08:22:56,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:56,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-13 08:22:56,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-13 08:22:56,164 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 26 [2021-06-13 08:22:56,165 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 08:22:56,165 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:56,165 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 26 [2021-06-13 08:22:56,166 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:56,195 INFO L129 PetriNetUnfolder]: 22/81 cut-off events. [2021-06-13 08:22:56,195 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,195 INFO L84 FinitePrefix]: Finished finitePrefix Result has 134 conditions, 81 events. 22/81 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 226 event pairs, 4 based on Foata normal form. 15/93 useless extension candidates. Maximal degree in co-relation 125. Up to 30 conditions per place. [2021-06-13 08:22:56,197 INFO L132 encePairwiseOnDemand]: 15/26 looper letters, 7 selfloop transitions, 7 changer transitions 1/26 dead transitions. [2021-06-13 08:22:56,197 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 26 transitions, 88 flow [2021-06-13 08:22:56,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-13 08:22:56,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-06-13 08:22:56,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 66 transitions. [2021-06-13 08:22:56,203 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8461538461538461 [2021-06-13 08:22:56,204 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 66 transitions. [2021-06-13 08:22:56,204 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 66 transitions. [2021-06-13 08:22:56,204 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:56,206 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 66 transitions. [2021-06-13 08:22:56,207 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 08:22:56,209 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 08:22:56,209 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 08:22:56,210 INFO L185 Difference]: Start difference. First operand has 29 places, 24 transitions, 54 flow. Second operand 3 states and 66 transitions. [2021-06-13 08:22:56,211 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 26 transitions, 88 flow [2021-06-13 08:22:56,212 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 08:22:56,214 INFO L241 Difference]: Finished difference. Result has 27 places, 25 transitions, 96 flow [2021-06-13 08:22:56,215 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 08:22:56,215 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, -2 predicate places. [2021-06-13 08:22:56,215 INFO L482 AbstractCegarLoop]: Abstraction has has 27 places, 25 transitions, 96 flow [2021-06-13 08:22:56,215 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 08:22:56,216 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:56,216 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:56,216 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-06-13 08:22:56,216 INFO L430 AbstractCegarLoop]: === Iteration 2 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:56,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:56,216 INFO L82 PathProgramCache]: Analyzing trace with hash -968737348, now seen corresponding path program 1 times [2021-06-13 08:22:56,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:56,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290678121] [2021-06-13 08:22:56,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:56,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:56,229 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,229 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:56,230 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,231 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:56,237 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,238 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-06-13 08:22:56,244 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,244 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:56,245 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 08:22:56,245 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:56,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290678121] [2021-06-13 08:22:56,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290678121] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:56,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:56,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-13 08:22:56,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256119925] [2021-06-13 08:22:56,246 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-13 08:22:56,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:56,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-13 08:22:56,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-13 08:22:56,247 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 26 [2021-06-13 08:22:56,247 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 25 transitions, 96 flow. Second operand has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:56,248 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:56,248 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 26 [2021-06-13 08:22:56,248 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:56,271 INFO L129 PetriNetUnfolder]: 27/88 cut-off events. [2021-06-13 08:22:56,271 INFO L130 PetriNetUnfolder]: For 4/4 co-relation queries the response was YES. [2021-06-13 08:22:56,272 INFO L84 FinitePrefix]: Finished finitePrefix Result has 199 conditions, 88 events. 27/88 cut-off events. For 4/4 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 253 event pairs, 7 based on Foata normal form. 5/91 useless extension candidates. Maximal degree in co-relation 189. Up to 29 conditions per place. [2021-06-13 08:22:56,272 INFO L132 encePairwiseOnDemand]: 21/26 looper letters, 6 selfloop transitions, 5 changer transitions 0/30 dead transitions. [2021-06-13 08:22:56,272 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 30 transitions, 128 flow [2021-06-13 08:22:56,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-13 08:22:56,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-06-13 08:22:56,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 84 transitions. [2021-06-13 08:22:56,274 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8076923076923077 [2021-06-13 08:22:56,274 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,274 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,274 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:56,274 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,275 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 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 08:22:56,275 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 08:22:56,275 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 08:22:56,275 INFO L185 Difference]: Start difference. First operand has 27 places, 25 transitions, 96 flow. Second operand 4 states and 84 transitions. [2021-06-13 08:22:56,275 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 30 transitions, 128 flow [2021-06-13 08:22:56,276 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 30 transitions, 114 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-13 08:22:56,277 INFO L241 Difference]: Finished difference. Result has 29 places, 28 transitions, 111 flow [2021-06-13 08:22:56,277 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=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=111, PETRI_PLACES=29, PETRI_TRANSITIONS=28} [2021-06-13 08:22:56,278 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 0 predicate places. [2021-06-13 08:22:56,278 INFO L482 AbstractCegarLoop]: Abstraction has has 29 places, 28 transitions, 111 flow [2021-06-13 08:22:56,278 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:56,278 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:56,278 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:56,278 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-06-13 08:22:56,278 INFO L430 AbstractCegarLoop]: === Iteration 3 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:56,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:56,279 INFO L82 PathProgramCache]: Analyzing trace with hash -533317838, now seen corresponding path program 2 times [2021-06-13 08:22:56,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:56,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383747278] [2021-06-13 08:22:56,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:56,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:56,293 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,293 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:56,294 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,298 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:56,303 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,303 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-06-13 08:22:56,310 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,310 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:56,311 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 08:22:56,311 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:56,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1383747278] [2021-06-13 08:22:56,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1383747278] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:56,311 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:56,311 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-13 08:22:56,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640586600] [2021-06-13 08:22:56,311 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-13 08:22:56,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:56,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-13 08:22:56,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-13 08:22:56,312 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 26 [2021-06-13 08:22:56,313 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 28 transitions, 111 flow. Second operand has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:56,313 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:56,313 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 26 [2021-06-13 08:22:56,313 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:56,340 INFO L129 PetriNetUnfolder]: 10/40 cut-off events. [2021-06-13 08:22:56,340 INFO L130 PetriNetUnfolder]: For 14/17 co-relation queries the response was YES. [2021-06-13 08:22:56,340 INFO L84 FinitePrefix]: Finished finitePrefix Result has 107 conditions, 40 events. 10/40 cut-off events. For 14/17 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 87 event pairs, 0 based on Foata normal form. 4/43 useless extension candidates. Maximal degree in co-relation 96. Up to 12 conditions per place. [2021-06-13 08:22:56,341 INFO L132 encePairwiseOnDemand]: 21/26 looper letters, 0 selfloop transitions, 0 changer transitions 26/26 dead transitions. [2021-06-13 08:22:56,341 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 26 transitions, 127 flow [2021-06-13 08:22:56,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-13 08:22:56,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-06-13 08:22:56,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 84 transitions. [2021-06-13 08:22:56,343 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8076923076923077 [2021-06-13 08:22:56,343 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,343 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,343 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:56,343 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,344 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 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 08:22:56,344 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 08:22:56,345 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 08:22:56,345 INFO L185 Difference]: Start difference. First operand has 29 places, 28 transitions, 111 flow. Second operand 4 states and 84 transitions. [2021-06-13 08:22:56,345 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 26 transitions, 127 flow [2021-06-13 08:22:56,345 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 26 transitions, 110 flow, removed 2 selfloop flow, removed 3 redundant places. [2021-06-13 08:22:56,346 INFO L241 Difference]: Finished difference. Result has 28 places, 0 transitions, 0 flow [2021-06-13 08:22:56,346 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=66, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=28, PETRI_TRANSITIONS=0} [2021-06-13 08:22:56,346 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, -1 predicate places. [2021-06-13 08:22:56,346 INFO L482 AbstractCegarLoop]: Abstraction has has 28 places, 0 transitions, 0 flow [2021-06-13 08:22:56,346 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:56,346 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-06-13 08:22:56,347 INFO L301 ceAbstractionStarter]: Result for error location Process1Thread1of1ForFork1 was SAFE (4/5) [2021-06-13 08:22:56,347 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-13 08:22:56,348 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:56,348 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:56,348 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:56,348 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:56,348 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:56,348 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:56,348 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:56,348 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process0Thread1of1ForFork0======== [2021-06-13 08:22:56,349 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,356 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-06-13 08:22:56,356 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,357 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 5. Compared 47 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 24. Up to 2 conditions per place. [2021-06-13 08:22:56,357 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-06-13 08:22:56,361 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 24 transitions, 54 flow [2021-06-13 08:22:56,364 INFO L129 PetriNetUnfolder]: 0/14 cut-off events. [2021-06-13 08:22:56,364 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,364 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:56,364 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-06-13 08:22:56,365 INFO L430 AbstractCegarLoop]: === Iteration 1 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:56,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:56,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1933706754, now seen corresponding path program 1 times [2021-06-13 08:22:56,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:56,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123158111] [2021-06-13 08:22:56,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:56,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:56,380 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,384 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:56,386 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 08:22:56,386 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:56,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123158111] [2021-06-13 08:22:56,387 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123158111] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:56,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:56,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-06-13 08:22:56,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416288797] [2021-06-13 08:22:56,387 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-13 08:22:56,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:56,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-13 08:22:56,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-13 08:22:56,389 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 26 [2021-06-13 08:22:56,389 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 08:22:56,389 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:56,389 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 26 [2021-06-13 08:22:56,390 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:56,416 INFO L129 PetriNetUnfolder]: 22/81 cut-off events. [2021-06-13 08:22:56,416 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-13 08:22:56,418 INFO L84 FinitePrefix]: Finished finitePrefix Result has 134 conditions, 81 events. 22/81 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 226 event pairs, 4 based on Foata normal form. 15/93 useless extension candidates. Maximal degree in co-relation 125. Up to 30 conditions per place. [2021-06-13 08:22:56,419 INFO L132 encePairwiseOnDemand]: 15/26 looper letters, 7 selfloop transitions, 7 changer transitions 1/26 dead transitions. [2021-06-13 08:22:56,419 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 27 places, 26 transitions, 88 flow [2021-06-13 08:22:56,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-13 08:22:56,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-06-13 08:22:56,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 66 transitions. [2021-06-13 08:22:56,422 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8461538461538461 [2021-06-13 08:22:56,422 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 66 transitions. [2021-06-13 08:22:56,422 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 66 transitions. [2021-06-13 08:22:56,422 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:56,422 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 66 transitions. [2021-06-13 08:22:56,423 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 08:22:56,424 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 08:22:56,424 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 08:22:56,424 INFO L185 Difference]: Start difference. First operand has 29 places, 24 transitions, 54 flow. Second operand 3 states and 66 transitions. [2021-06-13 08:22:56,425 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 27 places, 26 transitions, 88 flow [2021-06-13 08:22:56,426 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 08:22:56,427 INFO L241 Difference]: Finished difference. Result has 27 places, 25 transitions, 96 flow [2021-06-13 08:22:56,427 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 08:22:56,427 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, -2 predicate places. [2021-06-13 08:22:56,427 INFO L482 AbstractCegarLoop]: Abstraction has has 27 places, 25 transitions, 96 flow [2021-06-13 08:22:56,427 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 08:22:56,427 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:56,427 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:56,427 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-06-13 08:22:56,427 INFO L430 AbstractCegarLoop]: === Iteration 2 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:56,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:56,428 INFO L82 PathProgramCache]: Analyzing trace with hash -533307928, now seen corresponding path program 1 times [2021-06-13 08:22:56,428 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:56,428 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1220666943] [2021-06-13 08:22:56,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:56,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:56,461 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,462 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:56,463 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,463 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:56,466 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,467 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-06-13 08:22:56,474 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,474 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:56,474 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 08:22:56,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:56,475 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1220666943] [2021-06-13 08:22:56,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1220666943] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:56,475 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:56,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-13 08:22:56,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256756678] [2021-06-13 08:22:56,476 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-13 08:22:56,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:56,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-13 08:22:56,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-13 08:22:56,477 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 26 [2021-06-13 08:22:56,477 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 25 transitions, 96 flow. Second operand has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:56,478 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:56,478 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 26 [2021-06-13 08:22:56,478 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:56,507 INFO L129 PetriNetUnfolder]: 24/86 cut-off events. [2021-06-13 08:22:56,507 INFO L130 PetriNetUnfolder]: For 4/4 co-relation queries the response was YES. [2021-06-13 08:22:56,508 INFO L84 FinitePrefix]: Finished finitePrefix Result has 191 conditions, 86 events. 24/86 cut-off events. For 4/4 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 250 event pairs, 4 based on Foata normal form. 7/92 useless extension candidates. Maximal degree in co-relation 181. Up to 27 conditions per place. [2021-06-13 08:22:56,508 INFO L132 encePairwiseOnDemand]: 21/26 looper letters, 6 selfloop transitions, 5 changer transitions 0/30 dead transitions. [2021-06-13 08:22:56,508 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 30 transitions, 128 flow [2021-06-13 08:22:56,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-13 08:22:56,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-06-13 08:22:56,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 84 transitions. [2021-06-13 08:22:56,510 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8076923076923077 [2021-06-13 08:22:56,510 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,510 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,510 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:56,511 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,511 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 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 08:22:56,512 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 08:22:56,512 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 08:22:56,513 INFO L185 Difference]: Start difference. First operand has 27 places, 25 transitions, 96 flow. Second operand 4 states and 84 transitions. [2021-06-13 08:22:56,513 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 30 transitions, 128 flow [2021-06-13 08:22:56,515 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 30 transitions, 114 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-13 08:22:56,515 INFO L241 Difference]: Finished difference. Result has 29 places, 28 transitions, 111 flow [2021-06-13 08:22:56,516 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=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=111, PETRI_PLACES=29, PETRI_TRANSITIONS=28} [2021-06-13 08:22:56,516 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, 0 predicate places. [2021-06-13 08:22:56,516 INFO L482 AbstractCegarLoop]: Abstraction has has 29 places, 28 transitions, 111 flow [2021-06-13 08:22:56,516 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:56,516 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:56,516 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:56,516 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-06-13 08:22:56,516 INFO L430 AbstractCegarLoop]: === Iteration 3 === [Process0Err0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:56,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:56,517 INFO L82 PathProgramCache]: Analyzing trace with hash -968727438, now seen corresponding path program 2 times [2021-06-13 08:22:56,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:56,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539710181] [2021-06-13 08:22:56,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:56,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:56,541 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,542 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:56,545 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,545 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:56,549 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,550 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-06-13 08:22:56,560 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:56,561 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:56,562 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 08:22:56,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:56,564 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539710181] [2021-06-13 08:22:56,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539710181] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:56,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:56,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-13 08:22:56,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704199626] [2021-06-13 08:22:56,565 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-13 08:22:56,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:56,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-13 08:22:56,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-13 08:22:56,566 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 26 [2021-06-13 08:22:56,566 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 28 transitions, 111 flow. Second operand has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:56,566 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:56,566 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 26 [2021-06-13 08:22:56,566 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:56,580 INFO L129 PetriNetUnfolder]: 11/44 cut-off events. [2021-06-13 08:22:56,580 INFO L130 PetriNetUnfolder]: For 9/9 co-relation queries the response was YES. [2021-06-13 08:22:56,580 INFO L84 FinitePrefix]: Finished finitePrefix Result has 115 conditions, 44 events. 11/44 cut-off events. For 9/9 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 84 event pairs, 0 based on Foata normal form. 3/47 useless extension candidates. Maximal degree in co-relation 104. Up to 13 conditions per place. [2021-06-13 08:22:56,581 INFO L132 encePairwiseOnDemand]: 21/26 looper letters, 0 selfloop transitions, 0 changer transitions 26/26 dead transitions. [2021-06-13 08:22:56,581 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 26 transitions, 127 flow [2021-06-13 08:22:56,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-13 08:22:56,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-06-13 08:22:56,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 84 transitions. [2021-06-13 08:22:56,581 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8076923076923077 [2021-06-13 08:22:56,581 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,581 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,582 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:56,582 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 84 transitions. [2021-06-13 08:22:56,583 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 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 08:22:56,583 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 08:22:56,583 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 08:22:56,583 INFO L185 Difference]: Start difference. First operand has 29 places, 28 transitions, 111 flow. Second operand 4 states and 84 transitions. [2021-06-13 08:22:56,583 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 26 transitions, 127 flow [2021-06-13 08:22:56,585 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 28 places, 26 transitions, 110 flow, removed 2 selfloop flow, removed 3 redundant places. [2021-06-13 08:22:56,586 INFO L241 Difference]: Finished difference. Result has 28 places, 0 transitions, 0 flow [2021-06-13 08:22:56,586 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=26, PETRI_DIFFERENCE_MINUEND_FLOW=66, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=21, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=28, PETRI_TRANSITIONS=0} [2021-06-13 08:22:56,586 INFO L335 CegarLoopForPetriNet]: 29 programPoint places, -1 predicate places. [2021-06-13 08:22:56,586 INFO L482 AbstractCegarLoop]: Abstraction has has 28 places, 0 transitions, 0 flow [2021-06-13 08:22:56,586 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:56,586 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-06-13 08:22:56,586 INFO L301 ceAbstractionStarter]: Result for error location Process0Thread1of1ForFork0 was SAFE (5/5) [2021-06-13 08:22:56,587 INFO L247 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2021-06-13 08:22:56,590 INFO L202 PluginConnector]: Adding new model Peterson.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.06 08:22:56 BasicIcfg [2021-06-13 08:22:56,590 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-06-13 08:22:56,591 INFO L168 Benchmark]: Toolchain (without parser) took 884.28 ms. Allocated memory is still 208.7 MB. Free memory was 189.5 MB in the beginning and 186.2 MB in the end (delta: 3.3 MB). Peak memory consumption was 4.8 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:56,591 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.08 ms. Allocated memory is still 208.7 MB. Free memory is still 190.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-06-13 08:22:56,591 INFO L168 Benchmark]: Boogie Procedure Inliner took 15.79 ms. Allocated memory is still 208.7 MB. Free memory was 189.5 MB in the beginning and 188.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:56,592 INFO L168 Benchmark]: Boogie Preprocessor took 9.60 ms. Allocated memory is still 208.7 MB. Free memory was 188.0 MB in the beginning and 187.1 MB in the end (delta: 944.5 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:56,593 INFO L168 Benchmark]: RCFGBuilder took 146.77 ms. Allocated memory is still 208.7 MB. Free memory was 187.0 MB in the beginning and 177.0 MB in the end (delta: 10.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:56,594 INFO L168 Benchmark]: TraceAbstraction took 709.03 ms. Allocated memory is still 208.7 MB. Free memory was 176.5 MB in the beginning and 186.2 MB in the end (delta: -9.7 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-06-13 08:22:56,597 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 190.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 15.79 ms. Allocated memory is still 208.7 MB. Free memory was 189.5 MB in the beginning and 188.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 9.60 ms. Allocated memory is still 208.7 MB. Free memory was 188.0 MB in the beginning and 187.1 MB in the end (delta: 944.5 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 146.77 ms. Allocated memory is still 208.7 MB. Free memory was 187.0 MB in the beginning and 177.0 MB in the end (delta: 10.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * TraceAbstraction took 709.03 ms. Allocated memory is still 208.7 MB. Free memory was 176.5 MB in the beginning and 186.2 MB in the end (delta: -9.7 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 37]: assertion always holds For all program executions holds that assertion always holds at this location - PositiveResult [Line: 54]: 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, 47 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: 41.9ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 0.0ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 37.8ms, 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, 47 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: 6.6ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 0.0ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 5.2ms, 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, 47 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: 6.2ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 0.0ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 5.0ms, 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: Process1Thread1of1ForFork1 with 1 thread instances CFG has 5 procedures, 47 locations, 6 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 2.9ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 299.5ms, OverallIterations: 3, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 120.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 6.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 26 SDtfs, 8 SDslu, 2 SDs, 0 SdLazy, 26 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 28.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=111occurred in iteration=2, InterpolantAutomatonStates: 11, 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: 3.9ms SsaConstructionTime, 13.4ms SatisfiabilityAnalysisTime, 82.0ms InterpolantComputationTime, 31 NumberOfCodeBlocks, 31 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 28 ConstructedInterpolants, 0 QuantifiedInterpolants, 70 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process0Thread1of1ForFork0 with 1 thread instances CFG has 5 procedures, 47 locations, 6 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 2.8ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 238.5ms, OverallIterations: 3, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 98.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 12.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 27 SDtfs, 8 SDslu, 2 SDs, 0 SdLazy, 26 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 23.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.1ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=111occurred in iteration=2, InterpolantAutomatonStates: 11, 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: 4.3ms SsaConstructionTime, 14.3ms SatisfiabilityAnalysisTime, 82.4ms InterpolantComputationTime, 30 NumberOfCodeBlocks, 30 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 27 ConstructedInterpolants, 0 QuantifiedInterpolants, 67 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 2 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...