/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/example_multiple_interleavings.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-24 13:30:09,925 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-24 13:30:09,927 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-24 13:30:09,957 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-24 13:30:09,972 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-24 13:30:09,973 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-24 13:30:09,974 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-24 13:30:09,975 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-24 13:30:09,977 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-24 13:30:09,977 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-24 13:30:09,979 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-24 13:30:09,985 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-24 13:30:09,986 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-24 13:30:09,987 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-24 13:30:09,988 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-24 13:30:09,989 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-24 13:30:09,993 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-03-24 13:30:10,001 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-VariableLbe.epf [2021-03-24 13:30:10,028 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-24 13:30:10,028 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-24 13:30:10,031 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-24 13:30:10,031 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-24 13:30:10,031 INFO L138 SettingsManager]: * Use SBE=true [2021-03-24 13:30:10,031 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-24 13:30:10,031 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-24 13:30:10,031 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-24 13:30:10,031 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-24 13:30:10,032 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-24 13:30:10,032 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-24 13:30:10,033 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-24 13:30:10,033 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-24 13:30:10,033 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-24 13:30:10,033 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-24 13:30:10,033 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-24 13:30:10,033 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-24 13:30:10,033 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-24 13:30:10,033 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-24 13:30:10,034 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-24 13:30:10,034 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-24 13:30:10,034 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 13:30:10,034 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-24 13:30:10,034 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-24 13:30:10,034 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-24 13:30:10,034 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-24 13:30:10,035 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-24 13:30:10,035 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=VARIABLE_BASED_MOVER_CHECK [2021-03-24 13:30:10,035 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-24 13:30:10,035 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-24 13:30:10,276 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-24 13:30:10,289 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-24 13:30:10,291 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-24 13:30:10,291 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-24 13:30:10,292 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-24 13:30:10,293 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/example_multiple_interleavings.bpl [2021-03-24 13:30:10,293 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/example_multiple_interleavings.bpl' [2021-03-24 13:30:10,329 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-24 13:30:10,330 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-24 13:30:10,331 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-24 13:30:10,331 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-24 13:30:10,331 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-24 13:30:10,339 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,344 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,350 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-24 13:30:10,351 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-24 13:30:10,351 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-24 13:30:10,351 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-24 13:30:10,356 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,356 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,357 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,357 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,358 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,359 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,359 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... [2021-03-24 13:30:10,360 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-24 13:30:10,360 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-24 13:30:10,361 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-24 13:30:10,361 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-24 13:30:10,362 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 13:30:10,412 INFO L124 BoogieDeclarations]: Specification and implementation of procedure set_y given in one single declaration [2021-03-24 13:30:10,413 INFO L130 BoogieDeclarations]: Found specification of procedure set_y [2021-03-24 13:30:10,414 INFO L138 BoogieDeclarations]: Found implementation of procedure set_y [2021-03-24 13:30:10,414 INFO L124 BoogieDeclarations]: Specification and implementation of procedure set_x_1 given in one single declaration [2021-03-24 13:30:10,414 INFO L130 BoogieDeclarations]: Found specification of procedure set_x_1 [2021-03-24 13:30:10,414 INFO L138 BoogieDeclarations]: Found implementation of procedure set_x_1 [2021-03-24 13:30:10,414 INFO L124 BoogieDeclarations]: Specification and implementation of procedure set_x_0 given in one single declaration [2021-03-24 13:30:10,414 INFO L130 BoogieDeclarations]: Found specification of procedure set_x_0 [2021-03-24 13:30:10,414 INFO L138 BoogieDeclarations]: Found implementation of procedure set_x_0 [2021-03-24 13:30:10,414 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-24 13:30:10,415 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-24 13:30:10,415 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-24 13:30:10,415 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-24 13:30:10,515 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-24 13:30:10,516 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-24 13:30:10,517 INFO L202 PluginConnector]: Adding new model example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:30:10 BoogieIcfgContainer [2021-03-24 13:30:10,517 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-24 13:30:10,532 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-24 13:30:10,532 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-24 13:30:10,534 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-24 13:30:10,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:10" (1/2) ... [2021-03-24 13:30:10,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3993cab3 and model type example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.03 01:30:10, skipping insertion in model container [2021-03-24 13:30:10,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:30:10" (2/2) ... [2021-03-24 13:30:10,536 INFO L111 eAbstractionObserver]: Analyzing ICFG example_multiple_interleavings.bpl [2021-03-24 13:30:10,542 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-24 13:30:10,544 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-24 13:30:10,545 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-24 13:30:10,601 INFO L149 ThreadInstanceAdder]: Constructed 9 joinOtherThreadTransitions. [2021-03-24 13:30:10,613 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-24 13:30:10,638 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:30:10,638 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:30:10,638 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:30:10,638 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:30:10,638 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:30:10,638 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:30:10,638 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:30:10,638 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:30:10,644 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 28 places, 24 transitions, 90 flow [2021-03-24 13:30:10,656 INFO L129 PetriNetUnfolder]: 5/24 cut-off events. [2021-03-24 13:30:10,656 INFO L130 PetriNetUnfolder]: For 12/12 co-relation queries the response was YES. [2021-03-24 13:30:10,658 INFO L84 FinitePrefix]: Finished finitePrefix Result has 46 conditions, 24 events. 5/24 cut-off events. For 12/12 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 32 event pairs, 0 based on Foata normal form. 0/23 useless extension candidates. Maximal degree in co-relation 20. Up to 6 conditions per place. [2021-03-24 13:30:10,658 INFO L82 GeneralOperation]: Start removeDead. Operand has 28 places, 24 transitions, 90 flow [2021-03-24 13:30:10,660 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 23 places, 19 transitions, 74 flow [2021-03-24 13:30:10,661 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:30:10,666 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 23 places, 19 transitions, 74 flow [2021-03-24 13:30:10,670 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 23 places, 19 transitions, 74 flow [2021-03-24 13:30:10,671 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 23 places, 19 transitions, 74 flow [2021-03-24 13:30:10,683 INFO L129 PetriNetUnfolder]: 5/22 cut-off events. [2021-03-24 13:30:10,685 INFO L130 PetriNetUnfolder]: For 12/12 co-relation queries the response was YES. [2021-03-24 13:30:10,686 INFO L84 FinitePrefix]: Finished finitePrefix Result has 44 conditions, 22 events. 5/22 cut-off events. For 12/12 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 37 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 20. Up to 6 conditions per place. [2021-03-24 13:30:10,688 INFO L142 LiptonReduction]: Number of co-enabled transitions 84 [2021-03-24 13:30:10,748 INFO L154 LiptonReduction]: Checked pairs total: 46 [2021-03-24 13:30:10,748 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-24 13:30:10,749 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 89 [2021-03-24 13:30:10,755 INFO L129 PetriNetUnfolder]: 5/18 cut-off events. [2021-03-24 13:30:10,756 INFO L130 PetriNetUnfolder]: For 12/12 co-relation queries the response was YES. [2021-03-24 13:30:10,756 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:10,756 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:10,756 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:10,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:10,759 INFO L82 PathProgramCache]: Analyzing trace with hash 902393523, now seen corresponding path program 1 times [2021-03-24 13:30:10,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:10,764 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454652320] [2021-03-24 13:30:10,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:10,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:10,829 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,830 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:10,836 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,837 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:10,842 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,842 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:10,843 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:30:10,843 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454652320] [2021-03-24 13:30:10,844 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:10,844 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:30:10,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866496378] [2021-03-24 13:30:10,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:30:10,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:10,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:30:10,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:30:10,857 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 23 out of 27 [2021-03-24 13:30:10,858 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 16 transitions, 68 flow. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,858 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:10,858 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 23 of 27 [2021-03-24 13:30:10,859 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:10,868 INFO L129 PetriNetUnfolder]: 3/16 cut-off events. [2021-03-24 13:30:10,868 INFO L130 PetriNetUnfolder]: For 19/19 co-relation queries the response was YES. [2021-03-24 13:30:10,869 INFO L84 FinitePrefix]: Finished finitePrefix Result has 40 conditions, 16 events. 3/16 cut-off events. For 19/19 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 17 event pairs, 0 based on Foata normal form. 1/17 useless extension candidates. Maximal degree in co-relation 14. Up to 4 conditions per place. [2021-03-24 13:30:10,869 INFO L132 encePairwiseOnDemand]: 25/27 looper letters, 2 selfloop transitions, 1 changer transitions 0/15 dead transitions. [2021-03-24 13:30:10,869 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 22 places, 15 transitions, 69 flow [2021-03-24 13:30:10,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:30:10,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:30:10,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 73 transitions. [2021-03-24 13:30:10,876 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.9012345679012346 [2021-03-24 13:30:10,877 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 73 transitions. [2021-03-24 13:30:10,877 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 73 transitions. [2021-03-24 13:30:10,877 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:10,879 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 73 transitions. [2021-03-24 13:30:10,880 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,882 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 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) [2021-03-24 13:30:10,883 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 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) [2021-03-24 13:30:10,884 INFO L185 Difference]: Start difference. First operand has 20 places, 16 transitions, 68 flow. Second operand 3 states and 73 transitions. [2021-03-24 13:30:10,884 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 22 places, 15 transitions, 69 flow [2021-03-24 13:30:10,892 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 16 places, 15 transitions, 47 flow, removed 0 selfloop flow, removed 6 redundant places. [2021-03-24 13:30:10,893 INFO L241 Difference]: Finished difference. Result has 16 places, 15 transitions, 43 flow [2021-03-24 13:30:10,894 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=41, PETRI_DIFFERENCE_MINUEND_PLACES=14, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=15, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=14, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=43, PETRI_PLACES=16, PETRI_TRANSITIONS=15} [2021-03-24 13:30:10,894 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, -4 predicate places. [2021-03-24 13:30:10,894 INFO L480 AbstractCegarLoop]: Abstraction has has 16 places, 15 transitions, 43 flow [2021-03-24 13:30:10,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,895 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:10,895 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:10,895 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-24 13:30:10,895 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:10,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:10,896 INFO L82 PathProgramCache]: Analyzing trace with hash 892361613, now seen corresponding path program 1 times [2021-03-24 13:30:10,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:10,896 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053008708] [2021-03-24 13:30:10,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:10,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:10,921 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,922 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:10,922 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,923 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:10,927 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,927 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:10,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:30:10,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053008708] [2021-03-24 13:30:10,928 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:10,928 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:30:10,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663578848] [2021-03-24 13:30:10,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:30:10,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:10,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:30:10,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:30:10,930 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 23 out of 27 [2021-03-24 13:30:10,930 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 16 places, 15 transitions, 43 flow. Second operand has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,930 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:10,930 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 23 of 27 [2021-03-24 13:30:10,930 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:10,935 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-03-24 13:30:10,935 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-03-24 13:30:10,935 INFO L84 FinitePrefix]: Finished finitePrefix Result has 19 conditions, 10 events. 0/10 cut-off events. For 3/3 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 5 event pairs, 0 based on Foata normal form. 2/12 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:30:10,935 INFO L132 encePairwiseOnDemand]: 24/27 looper letters, 1 selfloop transitions, 1 changer transitions 0/10 dead transitions. [2021-03-24 13:30:10,935 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 18 places, 10 transitions, 32 flow [2021-03-24 13:30:10,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:30:10,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:30:10,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 73 transitions. [2021-03-24 13:30:10,936 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.9012345679012346 [2021-03-24 13:30:10,936 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 73 transitions. [2021-03-24 13:30:10,936 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 73 transitions. [2021-03-24 13:30:10,936 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:10,937 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 73 transitions. [2021-03-24 13:30:10,937 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,937 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 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) [2021-03-24 13:30:10,938 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 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) [2021-03-24 13:30:10,938 INFO L185 Difference]: Start difference. First operand has 16 places, 15 transitions, 43 flow. Second operand 3 states and 73 transitions. [2021-03-24 13:30:10,938 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 18 places, 10 transitions, 32 flow [2021-03-24 13:30:10,938 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 17 places, 10 transitions, 31 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-24 13:30:10,938 INFO L241 Difference]: Finished difference. Result has 17 places, 10 transitions, 29 flow [2021-03-24 13:30:10,938 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=27, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=29, PETRI_PLACES=17, PETRI_TRANSITIONS=10} [2021-03-24 13:30:10,939 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, -3 predicate places. [2021-03-24 13:30:10,939 INFO L480 AbstractCegarLoop]: Abstraction has has 17 places, 10 transitions, 29 flow [2021-03-24 13:30:10,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,939 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:10,939 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:10,939 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-24 13:30:10,939 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:10,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:10,940 INFO L82 PathProgramCache]: Analyzing trace with hash 957775953, now seen corresponding path program 1 times [2021-03-24 13:30:10,940 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:10,940 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433905708] [2021-03-24 13:30:10,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:10,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:10,949 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,950 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:10,950 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,950 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:10,956 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,957 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:30:10,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:30:10,962 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433905708] [2021-03-24 13:30:10,962 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:10,962 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:30:10,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497890026] [2021-03-24 13:30:10,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:30:10,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:10,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:30:10,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:30:10,963 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 19 out of 27 [2021-03-24 13:30:10,964 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 17 places, 10 transitions, 29 flow. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,964 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:10,964 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 19 of 27 [2021-03-24 13:30:10,964 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:10,973 INFO L129 PetriNetUnfolder]: 4/25 cut-off events. [2021-03-24 13:30:10,973 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:30:10,973 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47 conditions, 25 events. 4/25 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 48 event pairs, 1 based on Foata normal form. 1/24 useless extension candidates. Maximal degree in co-relation 39. Up to 8 conditions per place. [2021-03-24 13:30:10,973 INFO L132 encePairwiseOnDemand]: 23/27 looper letters, 4 selfloop transitions, 3 changer transitions 0/13 dead transitions. [2021-03-24 13:30:10,973 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 20 places, 13 transitions, 49 flow [2021-03-24 13:30:10,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:30:10,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:30:10,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 84 transitions. [2021-03-24 13:30:10,974 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.7777777777777778 [2021-03-24 13:30:10,974 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 84 transitions. [2021-03-24 13:30:10,974 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 84 transitions. [2021-03-24 13:30:10,975 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:10,975 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 84 transitions. [2021-03-24 13:30:10,975 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) [2021-03-24 13:30:10,976 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,976 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,976 INFO L185 Difference]: Start difference. First operand has 17 places, 10 transitions, 29 flow. Second operand 4 states and 84 transitions. [2021-03-24 13:30:10,976 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 20 places, 13 transitions, 49 flow [2021-03-24 13:30:10,977 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 19 places, 13 transitions, 48 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-24 13:30:10,977 INFO L241 Difference]: Finished difference. Result has 21 places, 12 transitions, 49 flow [2021-03-24 13:30:10,978 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=28, PETRI_DIFFERENCE_MINUEND_PLACES=16, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=49, PETRI_PLACES=21, PETRI_TRANSITIONS=12} [2021-03-24 13:30:10,978 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 1 predicate places. [2021-03-24 13:30:10,978 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 12 transitions, 49 flow [2021-03-24 13:30:10,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,978 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:10,978 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:10,978 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-24 13:30:10,978 INFO L428 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:10,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:10,979 INFO L82 PathProgramCache]: Analyzing trace with hash -842576759, now seen corresponding path program 2 times [2021-03-24 13:30:10,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:10,979 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945382012] [2021-03-24 13:30:10,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:10,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:10,988 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,988 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:10,988 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,989 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:10,991 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:10,991 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:30:10,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:30:10,997 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945382012] [2021-03-24 13:30:10,997 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:10,997 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:30:10,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820043437] [2021-03-24 13:30:10,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:30:10,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:10,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:30:10,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:30:10,998 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 19 out of 27 [2021-03-24 13:30:10,998 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 21 places, 12 transitions, 49 flow. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:10,999 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:10,999 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 19 of 27 [2021-03-24 13:30:10,999 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:11,007 INFO L129 PetriNetUnfolder]: 3/28 cut-off events. [2021-03-24 13:30:11,007 INFO L130 PetriNetUnfolder]: For 23/26 co-relation queries the response was YES. [2021-03-24 13:30:11,007 INFO L84 FinitePrefix]: Finished finitePrefix Result has 71 conditions, 28 events. 3/28 cut-off events. For 23/26 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 73 event pairs, 1 based on Foata normal form. 1/28 useless extension candidates. Maximal degree in co-relation 61. Up to 10 conditions per place. [2021-03-24 13:30:11,007 INFO L132 encePairwiseOnDemand]: 23/27 looper letters, 2 selfloop transitions, 6 changer transitions 1/15 dead transitions. [2021-03-24 13:30:11,007 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 24 places, 15 transitions, 80 flow [2021-03-24 13:30:11,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:30:11,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:30:11,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 84 transitions. [2021-03-24 13:30:11,008 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.7777777777777778 [2021-03-24 13:30:11,008 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 84 transitions. [2021-03-24 13:30:11,008 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 84 transitions. [2021-03-24 13:30:11,009 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:11,009 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 84 transitions. [2021-03-24 13:30:11,009 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) [2021-03-24 13:30:11,010 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,010 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,010 INFO L185 Difference]: Start difference. First operand has 21 places, 12 transitions, 49 flow. Second operand 4 states and 84 transitions. [2021-03-24 13:30:11,010 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 24 places, 15 transitions, 80 flow [2021-03-24 13:30:11,010 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 23 places, 15 transitions, 78 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-24 13:30:11,011 INFO L241 Difference]: Finished difference. Result has 25 places, 14 transitions, 79 flow [2021-03-24 13:30:11,011 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=48, PETRI_DIFFERENCE_MINUEND_PLACES=20, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=79, PETRI_PLACES=25, PETRI_TRANSITIONS=14} [2021-03-24 13:30:11,011 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 5 predicate places. [2021-03-24 13:30:11,011 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 14 transitions, 79 flow [2021-03-24 13:30:11,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,011 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:11,011 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:11,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-24 13:30:11,012 INFO L428 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:11,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:11,012 INFO L82 PathProgramCache]: Analyzing trace with hash 71195793, now seen corresponding path program 3 times [2021-03-24 13:30:11,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:11,012 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125484660] [2021-03-24 13:30:11,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:11,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:11,020 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:11,021 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:11,021 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:11,021 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-03-24 13:30:11,024 INFO L142 QuantifierPusher]: treesize reduction 2, result has 77.8 percent of original size [2021-03-24 13:30:11,025 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:30:11,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:30:11,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125484660] [2021-03-24 13:30:11,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:11,029 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:30:11,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175690106] [2021-03-24 13:30:11,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:30:11,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:11,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:30:11,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:30:11,031 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 19 out of 27 [2021-03-24 13:30:11,031 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 25 places, 14 transitions, 79 flow. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,031 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:11,031 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 19 of 27 [2021-03-24 13:30:11,037 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:11,044 INFO L129 PetriNetUnfolder]: 1/18 cut-off events. [2021-03-24 13:30:11,044 INFO L130 PetriNetUnfolder]: For 31/37 co-relation queries the response was YES. [2021-03-24 13:30:11,044 INFO L84 FinitePrefix]: Finished finitePrefix Result has 63 conditions, 18 events. 1/18 cut-off events. For 31/37 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 31 event pairs, 0 based on Foata normal form. 1/19 useless extension candidates. Maximal degree in co-relation 51. Up to 6 conditions per place. [2021-03-24 13:30:11,045 INFO L132 encePairwiseOnDemand]: 24/27 looper letters, 5 selfloop transitions, 2 changer transitions 2/15 dead transitions. [2021-03-24 13:30:11,045 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 28 places, 15 transitions, 103 flow [2021-03-24 13:30:11,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:30:11,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:30:11,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 82 transitions. [2021-03-24 13:30:11,046 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.7592592592592593 [2021-03-24 13:30:11,046 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 82 transitions. [2021-03-24 13:30:11,046 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 82 transitions. [2021-03-24 13:30:11,046 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:11,046 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 82 transitions. [2021-03-24 13:30:11,046 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,047 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,047 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,047 INFO L185 Difference]: Start difference. First operand has 25 places, 14 transitions, 79 flow. Second operand 4 states and 82 transitions. [2021-03-24 13:30:11,047 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 28 places, 15 transitions, 103 flow [2021-03-24 13:30:11,048 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 26 places, 15 transitions, 90 flow, removed 3 selfloop flow, removed 2 redundant places. [2021-03-24 13:30:11,048 INFO L241 Difference]: Finished difference. Result has 28 places, 13 transitions, 70 flow [2021-03-24 13:30:11,048 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=66, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=14, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=70, PETRI_PLACES=28, PETRI_TRANSITIONS=13} [2021-03-24 13:30:11,049 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 8 predicate places. [2021-03-24 13:30:11,049 INFO L480 AbstractCegarLoop]: Abstraction has has 28 places, 13 transitions, 70 flow [2021-03-24 13:30:11,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,049 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:11,049 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:11,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-24 13:30:11,049 INFO L428 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr2INUSE_VIOLATION, ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:11,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:11,049 INFO L82 PathProgramCache]: Analyzing trace with hash 66230165, now seen corresponding path program 4 times [2021-03-24 13:30:11,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:11,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695906933] [2021-03-24 13:30:11,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:11,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:11,057 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:11,057 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:11,057 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:11,058 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:11,060 INFO L142 QuantifierPusher]: treesize reduction 2, result has 77.8 percent of original size [2021-03-24 13:30:11,061 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 13:30:11,066 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:30:11,066 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695906933] [2021-03-24 13:30:11,066 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:11,066 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:30:11,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105376720] [2021-03-24 13:30:11,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:30:11,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:11,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:30:11,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:30:11,067 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 19 out of 27 [2021-03-24 13:30:11,067 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 13 transitions, 70 flow. Second operand has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,067 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:11,067 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 19 of 27 [2021-03-24 13:30:11,068 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:11,072 INFO L129 PetriNetUnfolder]: 1/13 cut-off events. [2021-03-24 13:30:11,072 INFO L130 PetriNetUnfolder]: For 24/30 co-relation queries the response was YES. [2021-03-24 13:30:11,073 INFO L84 FinitePrefix]: Finished finitePrefix Result has 48 conditions, 13 events. 1/13 cut-off events. For 24/30 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 11 event pairs, 0 based on Foata normal form. 1/14 useless extension candidates. Maximal degree in co-relation 40. Up to 4 conditions per place. [2021-03-24 13:30:11,073 INFO L132 encePairwiseOnDemand]: 24/27 looper letters, 0 selfloop transitions, 0 changer transitions 12/12 dead transitions. [2021-03-24 13:30:11,073 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 12 transitions, 78 flow [2021-03-24 13:30:11,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:30:11,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:30:11,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 81 transitions. [2021-03-24 13:30:11,074 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.75 [2021-03-24 13:30:11,074 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 81 transitions. [2021-03-24 13:30:11,074 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 81 transitions. [2021-03-24 13:30:11,074 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:11,074 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 81 transitions. [2021-03-24 13:30:11,074 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,075 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,075 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,075 INFO L185 Difference]: Start difference. First operand has 28 places, 13 transitions, 70 flow. Second operand 4 states and 81 transitions. [2021-03-24 13:30:11,075 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 12 transitions, 78 flow [2021-03-24 13:30:11,075 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 24 places, 12 transitions, 64 flow, removed 1 selfloop flow, removed 5 redundant places. [2021-03-24 13:30:11,076 INFO L241 Difference]: Finished difference. Result has 24 places, 0 transitions, 0 flow [2021-03-24 13:30:11,076 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=52, PETRI_DIFFERENCE_MINUEND_PLACES=21, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=0, PETRI_PLACES=24, PETRI_TRANSITIONS=0} [2021-03-24 13:30:11,076 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 4 predicate places. [2021-03-24 13:30:11,076 INFO L480 AbstractCegarLoop]: Abstraction has has 24 places, 0 transitions, 0 flow [2021-03-24 13:30:11,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:11,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-24 13:30:11,079 INFO L202 PluginConnector]: Adding new model example_multiple_interleavings.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.03 01:30:11 BasicIcfg [2021-03-24 13:30:11,079 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-24 13:30:11,079 INFO L168 Benchmark]: Toolchain (without parser) took 748.98 ms. Allocated memory was 255.9 MB in the beginning and 383.8 MB in the end (delta: 127.9 MB). Free memory was 236.6 MB in the beginning and 358.9 MB in the end (delta: -122.3 MB). Peak memory consumption was 6.2 MB. Max. memory is 16.0 GB. [2021-03-24 13:30:11,080 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.08 ms. Allocated memory is still 255.9 MB. Free memory was 237.6 MB in the beginning and 237.4 MB in the end (delta: 182.0 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 13:30:11,080 INFO L168 Benchmark]: Boogie Procedure Inliner took 19.22 ms. Allocated memory is still 255.9 MB. Free memory was 236.6 MB in the beginning and 235.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-24 13:30:11,080 INFO L168 Benchmark]: Boogie Preprocessor took 9.23 ms. Allocated memory is still 255.9 MB. Free memory was 235.1 MB in the beginning and 234.2 MB in the end (delta: 931.1 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 13:30:11,081 INFO L168 Benchmark]: RCFGBuilder took 156.97 ms. Allocated memory is still 255.9 MB. Free memory was 234.2 MB in the beginning and 225.6 MB in the end (delta: 8.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. [2021-03-24 13:30:11,081 INFO L168 Benchmark]: TraceAbstraction took 546.36 ms. Allocated memory was 255.9 MB in the beginning and 383.8 MB in the end (delta: 127.9 MB). Free memory was 240.9 MB in the beginning and 358.9 MB in the end (delta: -118.0 MB). Peak memory consumption was 8.6 MB. Max. memory is 16.0 GB. [2021-03-24 13:30:11,082 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 255.9 MB. Free memory was 237.6 MB in the beginning and 237.4 MB in the end (delta: 182.0 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 19.22 ms. Allocated memory is still 255.9 MB. Free memory was 236.6 MB in the beginning and 235.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 9.23 ms. Allocated memory is still 255.9 MB. Free memory was 235.1 MB in the beginning and 234.2 MB in the end (delta: 931.1 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 156.97 ms. Allocated memory is still 255.9 MB. Free memory was 234.2 MB in the beginning and 225.6 MB in the end (delta: 8.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. * TraceAbstraction took 546.36 ms. Allocated memory was 255.9 MB in the beginning and 383.8 MB in the end (delta: 127.9 MB). Free memory was 240.9 MB in the beginning and 358.9 MB in the end (delta: -118.0 MB). Peak memory consumption was 8.6 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 78.7ms, 23 PlacesBefore, 20 PlacesAfterwards, 19 TransitionsBefore, 16 TransitionsAfterwards, 84 CoEnabledTransitionPairs, 2 FixpointIterations, 0 TrivialSequentialCompositions, 3 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 3 TotalNumberOfCompositions, 46 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 42, positive: 40, positive conditional: 0, positive unconditional: 40, negative: 2, negative conditional: 0, negative unconditional: 2, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 35, positive: 34, positive conditional: 0, positive unconditional: 34, negative: 1, negative conditional: 0, negative unconditional: 1, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 35, positive: 34, positive conditional: 0, positive unconditional: 34, negative: 1, negative conditional: 0, negative unconditional: 1, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 42, positive: 6, positive conditional: 0, positive unconditional: 6, negative: 1, negative conditional: 0, negative unconditional: 1, unknown: 35, unknown conditional: 0, unknown unconditional: 35] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - PositiveResult [Line: 19]: assertion always holds For all program executions holds that assertion always holds at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 3.4ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 441.5ms, OverallIterations: 6, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 105.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 114.0ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 21 SDtfs, 10 SDslu, 5 SDs, 0 SdLazy, 19 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 13.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.1ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=79occurred in iteration=4, InterpolantAutomatonStates: 22, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 8.1ms SsaConstructionTime, 16.6ms SatisfiabilityAnalysisTime, 111.3ms InterpolantComputationTime, 60 NumberOfCodeBlocks, 60 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 54 ConstructedInterpolants, 0 QuantifiedInterpolants, 166 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 6 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...