/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-SemanticLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-24 22:12:09,667 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-24 22:12:09,668 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-24 22:12:09,694 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-24 22:12:09,722 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-24 22:12:09,723 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-24 22:12:09,724 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-24 22:12:09,728 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-SemanticLbe.epf [2021-03-24 22:12:09,763 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-24 22:12:09,763 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-24 22:12:09,766 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-24 22:12:09,766 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-24 22:12:09,766 INFO L138 SettingsManager]: * Use SBE=true [2021-03-24 22:12:09,766 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-24 22:12:09,767 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-24 22:12:09,767 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-24 22:12:09,767 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-24 22:12:09,767 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-24 22:12:09,768 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-24 22:12:09,768 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-24 22:12:09,768 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-24 22:12:09,768 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-24 22:12:09,768 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-24 22:12:09,768 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-24 22:12:09,768 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-24 22:12:09,769 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-24 22:12:09,769 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-24 22:12:09,769 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-24 22:12:09,769 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-24 22:12:09,769 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 22:12:09,769 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-24 22:12:09,769 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-24 22:12:09,770 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-24 22:12:09,770 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-24 22:12:09,770 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-24 22:12:09,770 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-24 22:12:09,770 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-24 22:12:10,097 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-24 22:12:10,124 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-24 22:12:10,126 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-24 22:12:10,127 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-24 22:12:10,128 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-24 22:12:10,129 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl [2021-03-24 22:12:10,129 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl' [2021-03-24 22:12:10,157 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-24 22:12:10,159 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-24 22:12:10,160 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-24 22:12:10,160 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-24 22:12:10,160 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-24 22:12:10,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,175 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,182 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-24 22:12:10,184 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-24 22:12:10,184 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-24 22:12:10,184 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-24 22:12:10,191 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,191 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,192 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,193 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,194 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,197 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,197 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/1) ... [2021-03-24 22:12:10,198 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-24 22:12:10,199 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-24 22:12:10,199 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-24 22:12:10,199 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-24 22:12:10,200 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (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 22:12:10,284 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-24 22:12:10,284 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-24 22:12:10,284 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-24 22:12:10,285 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-03-24 22:12:10,286 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-03-24 22:12:10,286 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-03-24 22:12:10,286 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 22:12:10,393 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-24 22:12:10,393 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-24 22:12:10,395 INFO L202 PluginConnector]: Adding new model fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 10:12:10 BoogieIcfgContainer [2021-03-24 22:12:10,396 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-24 22:12:10,397 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-24 22:12:10,398 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-24 22:12:10,400 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-24 22:12:10,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:12:10" (1/2) ... [2021-03-24 22:12:10,401 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@111a8632 and model type fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.03 10:12:10, skipping insertion in model container [2021-03-24 22:12:10,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 10:12:10" (2/2) ... [2021-03-24 22:12:10,402 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_inc.bpl [2021-03-24 22:12:10,410 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-24 22:12:10,413 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-24 22:12:10,426 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-24 22:12:10,456 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:10,469 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:10,485 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:10,485 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:10,485 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:10,486 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:10,486 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:10,486 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:10,486 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:10,486 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:10,493 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 8 transitions, 21 flow [2021-03-24 22:12:10,506 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 22:12:10,506 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,508 INFO L84 FinitePrefix]: Finished finitePrefix Result has 16 conditions, 11 events. 0/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 19 event pairs, 0 based on Foata normal form. 0/9 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 22:12:10,508 INFO L82 GeneralOperation]: Start removeDead. Operand has 11 places, 8 transitions, 21 flow [2021-03-24 22:12:10,511 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 9 places, 6 transitions, 17 flow [2021-03-24 22:12:10,512 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:10,522 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-24 22:12:10,525 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-24 22:12:10,526 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 6 transitions, 17 flow [2021-03-24 22:12:10,528 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 22:12:10,528 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,528 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12 conditions, 7 events. 0/7 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 8 event pairs, 0 based on Foata normal form. 0/7 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 22:12:10,529 INFO L142 LiptonReduction]: Number of co-enabled transitions 8 [2021-03-24 22:12:10,577 INFO L154 LiptonReduction]: Checked pairs total: 2 [2021-03-24 22:12:10,577 INFO L156 LiptonReduction]: Total number of compositions: 1 [2021-03-24 22:12:10,579 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 68 [2021-03-24 22:12:10,585 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 22:12:10,586 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,586 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:10,586 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:10,586 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:10,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:10,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1315, now seen corresponding path program 1 times [2021-03-24 22:12:10,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:10,609 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198881379] [2021-03-24 22:12:10,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:10,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:10,721 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:10,722 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:10,729 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 22:12:10,730 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198881379] [2021-03-24 22:12:10,730 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:10,730 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:10,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830294901] [2021-03-24 22:12:10,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:10,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:10,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:10,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:10,754 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 9 [2021-03-24 22:12:10,755 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 8 places, 5 transitions, 15 flow. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 22:12:10,755 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:10,755 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 9 [2021-03-24 22:12:10,757 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:10,774 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-24 22:12:10,774 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,774 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12 conditions, 4 events. 0/4 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 3/7 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 22:12:10,775 INFO L132 encePairwiseOnDemand]: 7/9 looper letters, 1 selfloop transitions, 1 changer transitions 0/4 dead transitions. [2021-03-24 22:12:10,775 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 9 places, 4 transitions, 17 flow [2021-03-24 22:12:10,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:10,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:10,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 15 transitions. [2021-03-24 22:12:10,783 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5555555555555556 [2021-03-24 22:12:10,784 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 15 transitions. [2021-03-24 22:12:10,784 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 15 transitions. [2021-03-24 22:12:10,785 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:10,786 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 15 transitions. [2021-03-24 22:12:10,788 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 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 22:12:10,790 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 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 22:12:10,791 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 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 22:12:10,792 INFO L185 Difference]: Start difference. First operand has 8 places, 5 transitions, 15 flow. Second operand 3 states and 15 transitions. [2021-03-24 22:12:10,793 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 9 places, 4 transitions, 17 flow [2021-03-24 22:12:10,794 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 9 places, 4 transitions, 17 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:10,795 INFO L241 Difference]: Finished difference. Result has 9 places, 4 transitions, 15 flow [2021-03-24 22:12:10,797 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=9, PETRI_DIFFERENCE_MINUEND_FLOW=13, PETRI_DIFFERENCE_MINUEND_PLACES=7, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=4, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=3, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=15, PETRI_PLACES=9, PETRI_TRANSITIONS=4} [2021-03-24 22:12:10,797 INFO L343 CegarLoopForPetriNet]: 8 programPoint places, 1 predicate places. [2021-03-24 22:12:10,797 INFO L480 AbstractCegarLoop]: Abstraction has has 9 places, 4 transitions, 15 flow [2021-03-24 22:12:10,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 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 22:12:10,798 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:10,798 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-24 22:12:10,798 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-24 22:12:10,798 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:10,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:10,799 INFO L82 PathProgramCache]: Analyzing trace with hash 41033, now seen corresponding path program 1 times [2021-03-24 22:12:10,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:10,800 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130654224] [2021-03-24 22:12:10,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:10,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:10,803 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:10,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:10,806 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:10,818 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:10,818 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:10,819 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-24 22:12:10,819 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:10,819 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-24 22:12:10,825 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:10,826 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:10,832 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:10,832 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:10,832 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:10,832 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:10,832 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:10,832 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:10,832 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:10,832 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:10,833 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 16 places, 11 transitions, 34 flow [2021-03-24 22:12:10,837 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-24 22:12:10,837 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,837 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 17 events. 0/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 38 event pairs, 0 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-24 22:12:10,837 INFO L82 GeneralOperation]: Start removeDead. Operand has 16 places, 11 transitions, 34 flow [2021-03-24 22:12:10,838 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 9 transitions, 30 flow [2021-03-24 22:12:10,838 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:10,838 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-24 22:12:10,838 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-24 22:12:10,839 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 14 places, 9 transitions, 30 flow [2021-03-24 22:12:10,841 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 22:12:10,841 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,841 INFO L84 FinitePrefix]: Finished finitePrefix Result has 21 conditions, 11 events. 0/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 11 event pairs, 0 based on Foata normal form. 0/11 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-24 22:12:10,842 INFO L142 LiptonReduction]: Number of co-enabled transitions 28 [2021-03-24 22:12:10,880 INFO L154 LiptonReduction]: Checked pairs total: 9 [2021-03-24 22:12:10,880 INFO L156 LiptonReduction]: Total number of compositions: 2 [2021-03-24 22:12:10,881 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 43 [2021-03-24 22:12:10,883 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:12:10,883 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,883 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:10,883 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:10,883 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:10,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:10,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1699, now seen corresponding path program 1 times [2021-03-24 22:12:10,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:10,884 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811596517] [2021-03-24 22:12:10,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:10,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:10,890 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:10,891 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:10,894 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 22:12:10,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811596517] [2021-03-24 22:12:10,895 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:10,895 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:10,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223035883] [2021-03-24 22:12:10,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:10,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:10,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:10,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:10,897 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 13 [2021-03-24 22:12:10,897 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 12 places, 7 transitions, 26 flow. Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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 22:12:10,897 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:10,897 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 13 [2021-03-24 22:12:10,897 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:10,908 INFO L129 PetriNetUnfolder]: 1/8 cut-off events. [2021-03-24 22:12:10,908 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,909 INFO L84 FinitePrefix]: Finished finitePrefix Result has 24 conditions, 8 events. 1/8 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 6 event pairs, 1 based on Foata normal form. 6/13 useless extension candidates. Maximal degree in co-relation 9. Up to 5 conditions per place. [2021-03-24 22:12:10,909 INFO L132 encePairwiseOnDemand]: 11/13 looper letters, 2 selfloop transitions, 1 changer transitions 0/6 dead transitions. [2021-03-24 22:12:10,909 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 13 places, 6 transitions, 30 flow [2021-03-24 22:12:10,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:10,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:10,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 22 transitions. [2021-03-24 22:12:10,911 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5641025641025641 [2021-03-24 22:12:10,911 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 22 transitions. [2021-03-24 22:12:10,911 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 22 transitions. [2021-03-24 22:12:10,911 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:10,911 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 22 transitions. [2021-03-24 22:12:10,912 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 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 22:12:10,912 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 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 22:12:10,912 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 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 22:12:10,915 INFO L185 Difference]: Start difference. First operand has 12 places, 7 transitions, 26 flow. Second operand 3 states and 22 transitions. [2021-03-24 22:12:10,915 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 13 places, 6 transitions, 30 flow [2021-03-24 22:12:10,915 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 13 places, 6 transitions, 28 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:10,916 INFO L241 Difference]: Finished difference. Result has 13 places, 6 transitions, 24 flow [2021-03-24 22:12:10,916 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=13, PETRI_DIFFERENCE_MINUEND_FLOW=22, PETRI_DIFFERENCE_MINUEND_PLACES=11, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=6, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=5, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=24, PETRI_PLACES=13, PETRI_TRANSITIONS=6} [2021-03-24 22:12:10,916 INFO L343 CegarLoopForPetriNet]: 12 programPoint places, 1 predicate places. [2021-03-24 22:12:10,916 INFO L480 AbstractCegarLoop]: Abstraction has has 13 places, 6 transitions, 24 flow [2021-03-24 22:12:10,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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 22:12:10,917 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:10,917 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 22:12:10,917 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-24 22:12:10,917 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:10,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:10,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1643499, now seen corresponding path program 1 times [2021-03-24 22:12:10,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:10,918 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1531264765] [2021-03-24 22:12:10,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:10,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:10,922 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:10,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:10,924 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:10,925 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:10,925 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:10,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-24 22:12:10,925 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:10,926 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-24 22:12:10,933 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:10,934 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:10,937 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:10,937 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:10,937 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:10,937 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:10,937 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:10,937 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:10,937 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:10,937 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:10,938 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 14 transitions, 49 flow [2021-03-24 22:12:10,943 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-24 22:12:10,943 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,943 INFO L84 FinitePrefix]: Finished finitePrefix Result has 39 conditions, 23 events. 0/23 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 65 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-24 22:12:10,943 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 14 transitions, 49 flow [2021-03-24 22:12:10,944 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 19 places, 12 transitions, 45 flow [2021-03-24 22:12:10,944 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:10,944 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-24 22:12:10,945 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-24 22:12:10,945 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 19 places, 12 transitions, 45 flow [2021-03-24 22:12:10,948 INFO L129 PetriNetUnfolder]: 0/15 cut-off events. [2021-03-24 22:12:10,948 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:10,948 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 15 events. 0/15 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 23 event pairs, 0 based on Foata normal form. 0/15 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-24 22:12:10,949 INFO L142 LiptonReduction]: Number of co-enabled transitions 60 [2021-03-24 22:12:11,007 INFO L154 LiptonReduction]: Checked pairs total: 21 [2021-03-24 22:12:11,007 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-24 22:12:11,007 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 63 [2021-03-24 22:12:11,009 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:12:11,009 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,009 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:11,009 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:11,010 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:11,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:11,010 INFO L82 PathProgramCache]: Analyzing trace with hash 2211, now seen corresponding path program 1 times [2021-03-24 22:12:11,010 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:11,010 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214773884] [2021-03-24 22:12:11,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:11,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:11,017 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:11,017 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:11,020 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 22:12:11,020 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214773884] [2021-03-24 22:12:11,020 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:11,021 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:11,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384685213] [2021-03-24 22:12:11,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:11,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:11,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:11,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:11,022 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 17 [2021-03-24 22:12:11,023 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 16 places, 9 transitions, 39 flow. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 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 22:12:11,023 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:11,023 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 17 [2021-03-24 22:12:11,023 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:11,033 INFO L129 PetriNetUnfolder]: 5/17 cut-off events. [2021-03-24 22:12:11,033 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,034 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47 conditions, 17 events. 5/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 30 event pairs, 5 based on Foata normal form. 11/25 useless extension candidates. Maximal degree in co-relation 24. Up to 13 conditions per place. [2021-03-24 22:12:11,034 INFO L132 encePairwiseOnDemand]: 15/17 looper letters, 3 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2021-03-24 22:12:11,034 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 8 transitions, 45 flow [2021-03-24 22:12:11,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:11,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:11,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 29 transitions. [2021-03-24 22:12:11,035 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5686274509803921 [2021-03-24 22:12:11,035 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 29 transitions. [2021-03-24 22:12:11,035 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 29 transitions. [2021-03-24 22:12:11,036 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:11,036 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 29 transitions. [2021-03-24 22:12:11,036 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 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 22:12:11,037 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:11,037 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:11,037 INFO L185 Difference]: Start difference. First operand has 16 places, 9 transitions, 39 flow. Second operand 3 states and 29 transitions. [2021-03-24 22:12:11,037 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 8 transitions, 45 flow [2021-03-24 22:12:11,038 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 17 places, 8 transitions, 39 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:11,038 INFO L241 Difference]: Finished difference. Result has 17 places, 8 transitions, 33 flow [2021-03-24 22:12:11,038 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=17, PETRI_DIFFERENCE_MINUEND_FLOW=31, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=33, PETRI_PLACES=17, PETRI_TRANSITIONS=8} [2021-03-24 22:12:11,039 INFO L343 CegarLoopForPetriNet]: 16 programPoint places, 1 predicate places. [2021-03-24 22:12:11,039 INFO L480 AbstractCegarLoop]: Abstraction has has 17 places, 8 transitions, 33 flow [2021-03-24 22:12:11,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 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 22:12:11,039 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:11,039 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-03-24 22:12:11,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-24 22:12:11,039 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:11,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:11,040 INFO L82 PathProgramCache]: Analyzing trace with hash 66279044, now seen corresponding path program 1 times [2021-03-24 22:12:11,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:11,040 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782672576] [2021-03-24 22:12:11,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:11,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:11,044 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:11,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:11,046 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:11,048 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:11,048 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:11,048 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-24 22:12:11,048 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:11,049 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-24 22:12:11,056 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:11,056 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:11,057 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:11,057 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:11,057 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:11,057 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:11,057 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:11,057 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:11,058 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:11,058 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:11,058 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 17 transitions, 66 flow [2021-03-24 22:12:11,063 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-03-24 22:12:11,064 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,064 INFO L84 FinitePrefix]: Finished finitePrefix Result has 52 conditions, 29 events. 0/29 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 91 event pairs, 0 based on Foata normal form. 0/24 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-24 22:12:11,064 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 17 transitions, 66 flow [2021-03-24 22:12:11,064 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 15 transitions, 62 flow [2021-03-24 22:12:11,064 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:11,065 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-24 22:12:11,065 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-24 22:12:11,065 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 15 transitions, 62 flow [2021-03-24 22:12:11,078 INFO L129 PetriNetUnfolder]: 0/19 cut-off events. [2021-03-24 22:12:11,078 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,079 INFO L84 FinitePrefix]: Finished finitePrefix Result has 42 conditions, 19 events. 0/19 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 29 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-24 22:12:11,079 INFO L142 LiptonReduction]: Number of co-enabled transitions 104 [2021-03-24 22:12:11,189 INFO L154 LiptonReduction]: Checked pairs total: 38 [2021-03-24 22:12:11,190 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 22:12:11,190 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 126 [2021-03-24 22:12:11,192 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:12:11,192 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,192 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:11,192 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:11,192 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:11,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:11,193 INFO L82 PathProgramCache]: Analyzing trace with hash 2851, now seen corresponding path program 1 times [2021-03-24 22:12:11,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:11,193 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078161563] [2021-03-24 22:12:11,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:11,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:11,208 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:11,208 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:11,211 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 22:12:11,213 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078161563] [2021-03-24 22:12:11,213 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:11,213 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:11,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251065941] [2021-03-24 22:12:11,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:11,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:11,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:11,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:11,216 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 21 [2021-03-24 22:12:11,218 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 11 transitions, 54 flow. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 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 22:12:11,218 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:11,218 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 21 [2021-03-24 22:12:11,218 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:11,247 INFO L129 PetriNetUnfolder]: 17/38 cut-off events. [2021-03-24 22:12:11,248 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,248 INFO L84 FinitePrefix]: Finished finitePrefix Result has 95 conditions, 38 events. 17/38 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 111 event pairs, 17 based on Foata normal form. 20/52 useless extension candidates. Maximal degree in co-relation 64. Up to 33 conditions per place. [2021-03-24 22:12:11,249 INFO L132 encePairwiseOnDemand]: 19/21 looper letters, 4 selfloop transitions, 1 changer transitions 0/10 dead transitions. [2021-03-24 22:12:11,249 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 10 transitions, 62 flow [2021-03-24 22:12:11,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:11,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:11,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 36 transitions. [2021-03-24 22:12:11,254 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5714285714285714 [2021-03-24 22:12:11,254 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 36 transitions. [2021-03-24 22:12:11,254 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 36 transitions. [2021-03-24 22:12:11,254 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:11,255 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 36 transitions. [2021-03-24 22:12:11,256 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 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 22:12:11,257 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 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 22:12:11,258 INFO L81 ComplementDD]: Finished complementDD. Result has 4 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 22:12:11,258 INFO L185 Difference]: Start difference. First operand has 20 places, 11 transitions, 54 flow. Second operand 3 states and 36 transitions. [2021-03-24 22:12:11,258 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 10 transitions, 62 flow [2021-03-24 22:12:11,260 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 10 transitions, 50 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:11,262 INFO L241 Difference]: Finished difference. Result has 21 places, 10 transitions, 42 flow [2021-03-24 22:12:11,262 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=21, PETRI_DIFFERENCE_MINUEND_FLOW=40, PETRI_DIFFERENCE_MINUEND_PLACES=19, 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=42, PETRI_PLACES=21, PETRI_TRANSITIONS=10} [2021-03-24 22:12:11,262 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 1 predicate places. [2021-03-24 22:12:11,262 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 10 transitions, 42 flow [2021-03-24 22:12:11,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 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 22:12:11,263 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:11,263 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-24 22:12:11,263 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-24 22:12:11,264 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:11,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:11,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1646739026, now seen corresponding path program 1 times [2021-03-24 22:12:11,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:11,265 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090604913] [2021-03-24 22:12:11,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:11,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:11,277 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:11,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:11,282 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:11,286 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:11,286 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:11,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-24 22:12:11,287 WARN L342 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:11,288 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-03-24 22:12:11,301 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:11,302 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:11,304 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:11,306 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:11,306 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:11,306 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:11,306 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:11,306 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:11,306 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:11,306 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:11,311 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 20 transitions, 85 flow [2021-03-24 22:12:11,316 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-24 22:12:11,316 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,316 INFO L84 FinitePrefix]: Finished finitePrefix Result has 66 conditions, 35 events. 0/35 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 111 event pairs, 0 based on Foata normal form. 0/29 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-24 22:12:11,316 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 20 transitions, 85 flow [2021-03-24 22:12:11,317 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 18 transitions, 81 flow [2021-03-24 22:12:11,317 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:11,317 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-24 22:12:11,317 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-24 22:12:11,318 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 18 transitions, 81 flow [2021-03-24 22:12:11,321 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-24 22:12:11,321 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,321 INFO L84 FinitePrefix]: Finished finitePrefix Result has 54 conditions, 23 events. 0/23 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 54 event pairs, 0 based on Foata normal form. 0/23 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-24 22:12:11,322 INFO L142 LiptonReduction]: Number of co-enabled transitions 160 [2021-03-24 22:12:11,471 INFO L154 LiptonReduction]: Checked pairs total: 60 [2021-03-24 22:12:11,471 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-24 22:12:11,472 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 155 [2021-03-24 22:12:11,478 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 22:12:11,479 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,479 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:11,479 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:11,479 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:11,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:11,479 INFO L82 PathProgramCache]: Analyzing trace with hash 3619, now seen corresponding path program 1 times [2021-03-24 22:12:11,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:11,480 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672694130] [2021-03-24 22:12:11,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:11,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:11,493 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:11,493 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:11,496 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 22:12:11,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672694130] [2021-03-24 22:12:11,496 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:11,496 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:11,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189581559] [2021-03-24 22:12:11,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:11,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:11,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:11,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:11,498 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-03-24 22:12:11,498 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 13 transitions, 71 flow. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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 22:12:11,498 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:11,499 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-03-24 22:12:11,499 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:11,536 INFO L129 PetriNetUnfolder]: 49/87 cut-off events. [2021-03-24 22:12:11,537 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,539 INFO L84 FinitePrefix]: Finished finitePrefix Result has 200 conditions, 87 events. 49/87 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 316 event pairs, 49 based on Foata normal form. 37/111 useless extension candidates. Maximal degree in co-relation 160. Up to 81 conditions per place. [2021-03-24 22:12:11,540 INFO L132 encePairwiseOnDemand]: 23/25 looper letters, 5 selfloop transitions, 1 changer transitions 0/12 dead transitions. [2021-03-24 22:12:11,541 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 12 transitions, 81 flow [2021-03-24 22:12:11,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:11,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:11,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 43 transitions. [2021-03-24 22:12:11,546 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5733333333333334 [2021-03-24 22:12:11,546 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 43 transitions. [2021-03-24 22:12:11,546 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 43 transitions. [2021-03-24 22:12:11,546 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:11,546 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 43 transitions. [2021-03-24 22:12:11,548 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 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 22:12:11,549 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 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 22:12:11,549 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 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 22:12:11,550 INFO L185 Difference]: Start difference. First operand has 24 places, 13 transitions, 71 flow. Second operand 3 states and 43 transitions. [2021-03-24 22:12:11,550 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 12 transitions, 81 flow [2021-03-24 22:12:11,553 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 12 transitions, 61 flow, removed 10 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:11,554 INFO L241 Difference]: Finished difference. Result has 25 places, 12 transitions, 51 flow [2021-03-24 22:12:11,554 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=25, PETRI_DIFFERENCE_MINUEND_FLOW=49, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=51, PETRI_PLACES=25, PETRI_TRANSITIONS=12} [2021-03-24 22:12:11,554 INFO L343 CegarLoopForPetriNet]: 24 programPoint places, 1 predicate places. [2021-03-24 22:12:11,554 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 12 transitions, 51 flow [2021-03-24 22:12:11,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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 22:12:11,554 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:11,555 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:11,555 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-24 22:12:11,555 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:11,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:11,555 INFO L82 PathProgramCache]: Analyzing trace with hash 1085119695, now seen corresponding path program 1 times [2021-03-24 22:12:11,555 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:11,558 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424050058] [2021-03-24 22:12:11,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:11,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:11,568 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:11,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:11,581 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:11,583 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:11,583 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:11,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-24 22:12:11,584 WARN L342 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:11,584 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-03-24 22:12:11,593 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:11,593 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:11,594 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:11,594 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:11,594 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:11,594 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:11,595 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:11,595 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:11,595 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:11,595 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:11,596 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 36 places, 23 transitions, 106 flow [2021-03-24 22:12:11,600 INFO L129 PetriNetUnfolder]: 0/41 cut-off events. [2021-03-24 22:12:11,600 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,600 INFO L84 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 41 events. 0/41 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 136 event pairs, 0 based on Foata normal form. 0/34 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-24 22:12:11,600 INFO L82 GeneralOperation]: Start removeDead. Operand has 36 places, 23 transitions, 106 flow [2021-03-24 22:12:11,601 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 21 transitions, 102 flow [2021-03-24 22:12:11,601 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:11,601 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-24 22:12:11,601 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-24 22:12:11,601 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 21 transitions, 102 flow [2021-03-24 22:12:11,604 INFO L129 PetriNetUnfolder]: 0/27 cut-off events. [2021-03-24 22:12:11,604 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,604 INFO L84 FinitePrefix]: Finished finitePrefix Result has 67 conditions, 27 events. 0/27 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 59 event pairs, 0 based on Foata normal form. 0/27 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-24 22:12:11,605 INFO L142 LiptonReduction]: Number of co-enabled transitions 228 [2021-03-24 22:12:11,740 INFO L154 LiptonReduction]: Checked pairs total: 87 [2021-03-24 22:12:11,740 INFO L156 LiptonReduction]: Total number of compositions: 6 [2021-03-24 22:12:11,740 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 139 [2021-03-24 22:12:11,742 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:12:11,742 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,742 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:11,742 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:11,742 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:11,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:11,743 INFO L82 PathProgramCache]: Analyzing trace with hash 4515, now seen corresponding path program 1 times [2021-03-24 22:12:11,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:11,747 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878597567] [2021-03-24 22:12:11,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:11,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:11,758 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:11,760 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:11,762 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 22:12:11,762 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878597567] [2021-03-24 22:12:11,763 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:11,763 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:11,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596216308] [2021-03-24 22:12:11,764 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:11,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:11,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:11,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:11,765 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 29 [2021-03-24 22:12:11,766 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 15 transitions, 90 flow. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 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 22:12:11,766 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:11,766 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 29 [2021-03-24 22:12:11,766 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:11,805 INFO L129 PetriNetUnfolder]: 129/200 cut-off events. [2021-03-24 22:12:11,805 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,806 INFO L84 FinitePrefix]: Finished finitePrefix Result has 434 conditions, 200 events. 129/200 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 32. Compared 780 event pairs, 129 based on Foata normal form. 70/246 useless extension candidates. Maximal degree in co-relation 384. Up to 193 conditions per place. [2021-03-24 22:12:11,809 INFO L132 encePairwiseOnDemand]: 27/29 looper letters, 6 selfloop transitions, 1 changer transitions 0/14 dead transitions. [2021-03-24 22:12:11,809 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 14 transitions, 102 flow [2021-03-24 22:12:11,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:11,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:11,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 50 transitions. [2021-03-24 22:12:11,811 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5747126436781609 [2021-03-24 22:12:11,811 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 50 transitions. [2021-03-24 22:12:11,811 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 50 transitions. [2021-03-24 22:12:11,811 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:11,811 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 50 transitions. [2021-03-24 22:12:11,812 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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 22:12:11,812 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 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 22:12:11,813 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 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 22:12:11,813 INFO L185 Difference]: Start difference. First operand has 28 places, 15 transitions, 90 flow. Second operand 3 states and 50 transitions. [2021-03-24 22:12:11,813 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 14 transitions, 102 flow [2021-03-24 22:12:11,814 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 14 transitions, 72 flow, removed 15 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:11,815 INFO L241 Difference]: Finished difference. Result has 29 places, 14 transitions, 60 flow [2021-03-24 22:12:11,815 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=58, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=14, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=60, PETRI_PLACES=29, PETRI_TRANSITIONS=14} [2021-03-24 22:12:11,815 INFO L343 CegarLoopForPetriNet]: 28 programPoint places, 1 predicate places. [2021-03-24 22:12:11,815 INFO L480 AbstractCegarLoop]: Abstraction has has 29 places, 14 transitions, 60 flow [2021-03-24 22:12:11,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 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 22:12:11,816 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:11,816 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:11,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-24 22:12:11,816 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:11,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:11,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1719135375, now seen corresponding path program 1 times [2021-03-24 22:12:11,816 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:11,817 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636662983] [2021-03-24 22:12:11,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:11,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:11,827 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:11,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:11,832 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:11,836 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:11,836 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:11,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-03-24 22:12:11,837 WARN L342 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:11,837 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-03-24 22:12:11,848 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:11,848 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:11,851 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:11,852 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:11,852 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:11,852 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:11,852 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:11,852 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:11,852 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:11,852 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:11,853 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 26 transitions, 129 flow [2021-03-24 22:12:11,857 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-24 22:12:11,857 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,857 INFO L84 FinitePrefix]: Finished finitePrefix Result has 97 conditions, 47 events. 0/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 166 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-24 22:12:11,857 INFO L82 GeneralOperation]: Start removeDead. Operand has 41 places, 26 transitions, 129 flow [2021-03-24 22:12:11,858 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 39 places, 24 transitions, 125 flow [2021-03-24 22:12:11,858 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:11,858 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-24 22:12:11,858 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-24 22:12:11,858 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 39 places, 24 transitions, 125 flow [2021-03-24 22:12:11,861 INFO L129 PetriNetUnfolder]: 0/31 cut-off events. [2021-03-24 22:12:11,861 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:11,861 INFO L84 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 31 events. 0/31 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 86 event pairs, 0 based on Foata normal form. 0/31 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-24 22:12:11,861 INFO L142 LiptonReduction]: Number of co-enabled transitions 308 [2021-03-24 22:12:12,005 INFO L154 LiptonReduction]: Checked pairs total: 119 [2021-03-24 22:12:12,006 INFO L156 LiptonReduction]: Total number of compositions: 7 [2021-03-24 22:12:12,006 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 148 [2021-03-24 22:12:12,007 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:12:12,007 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,007 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:12,008 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:12,008 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:12,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:12,008 INFO L82 PathProgramCache]: Analyzing trace with hash 5539, now seen corresponding path program 1 times [2021-03-24 22:12:12,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:12,008 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905204273] [2021-03-24 22:12:12,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:12,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:12,013 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:12,015 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:12,017 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 22:12:12,018 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905204273] [2021-03-24 22:12:12,018 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:12,018 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:12,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643343440] [2021-03-24 22:12:12,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:12,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:12,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:12,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:12,019 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 33 [2021-03-24 22:12:12,019 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 17 transitions, 111 flow. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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 22:12:12,019 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:12,019 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 33 [2021-03-24 22:12:12,019 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:12,068 INFO L129 PetriNetUnfolder]: 321/457 cut-off events. [2021-03-24 22:12:12,069 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,071 INFO L84 FinitePrefix]: Finished finitePrefix Result has 957 conditions, 457 events. 321/457 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 61. Compared 1914 event pairs, 321 based on Foata normal form. 135/549 useless extension candidates. Maximal degree in co-relation 896. Up to 449 conditions per place. [2021-03-24 22:12:12,074 INFO L132 encePairwiseOnDemand]: 31/33 looper letters, 7 selfloop transitions, 1 changer transitions 0/16 dead transitions. [2021-03-24 22:12:12,074 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 16 transitions, 125 flow [2021-03-24 22:12:12,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:12,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:12,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 57 transitions. [2021-03-24 22:12:12,075 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5757575757575758 [2021-03-24 22:12:12,075 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 57 transitions. [2021-03-24 22:12:12,075 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 57 transitions. [2021-03-24 22:12:12,075 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:12,075 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 57 transitions. [2021-03-24 22:12:12,076 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 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 22:12:12,076 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 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 22:12:12,076 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 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 22:12:12,076 INFO L185 Difference]: Start difference. First operand has 32 places, 17 transitions, 111 flow. Second operand 3 states and 57 transitions. [2021-03-24 22:12:12,076 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 16 transitions, 125 flow [2021-03-24 22:12:12,077 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 16 transitions, 83 flow, removed 21 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:12,078 INFO L241 Difference]: Finished difference. Result has 33 places, 16 transitions, 69 flow [2021-03-24 22:12:12,078 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=33, PETRI_DIFFERENCE_MINUEND_FLOW=67, PETRI_DIFFERENCE_MINUEND_PLACES=31, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=69, PETRI_PLACES=33, PETRI_TRANSITIONS=16} [2021-03-24 22:12:12,078 INFO L343 CegarLoopForPetriNet]: 32 programPoint places, 1 predicate places. [2021-03-24 22:12:12,078 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 16 transitions, 69 flow [2021-03-24 22:12:12,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 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 22:12:12,078 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:12,078 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:12,079 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-03-24 22:12:12,079 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:12,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:12,079 INFO L82 PathProgramCache]: Analyzing trace with hash 779611434, now seen corresponding path program 1 times [2021-03-24 22:12:12,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:12,079 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560260456] [2021-03-24 22:12:12,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:12,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:12,083 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:12,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:12,085 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:12,086 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:12,087 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:12,087 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-03-24 22:12:12,087 WARN L342 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:12,087 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2021-03-24 22:12:12,097 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:12,098 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:12,098 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:12,098 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:12,099 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:12,099 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:12,099 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:12,099 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:12,099 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:12,099 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:12,100 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 29 transitions, 154 flow [2021-03-24 22:12:12,104 INFO L129 PetriNetUnfolder]: 0/53 cut-off events. [2021-03-24 22:12:12,104 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,104 INFO L84 FinitePrefix]: Finished finitePrefix Result has 114 conditions, 53 events. 0/53 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 191 event pairs, 0 based on Foata normal form. 0/44 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-24 22:12:12,104 INFO L82 GeneralOperation]: Start removeDead. Operand has 46 places, 29 transitions, 154 flow [2021-03-24 22:12:12,104 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 44 places, 27 transitions, 150 flow [2021-03-24 22:12:12,104 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:12,105 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-24 22:12:12,105 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-24 22:12:12,105 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 44 places, 27 transitions, 150 flow [2021-03-24 22:12:12,108 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-24 22:12:12,108 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,108 INFO L84 FinitePrefix]: Finished finitePrefix Result has 96 conditions, 35 events. 0/35 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 73 event pairs, 0 based on Foata normal form. 0/35 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-24 22:12:12,109 INFO L142 LiptonReduction]: Number of co-enabled transitions 400 [2021-03-24 22:12:12,291 INFO L154 LiptonReduction]: Checked pairs total: 156 [2021-03-24 22:12:12,292 INFO L156 LiptonReduction]: Total number of compositions: 8 [2021-03-24 22:12:12,292 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 188 [2021-03-24 22:12:12,293 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:12:12,293 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,293 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:12,293 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:12,293 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:12,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:12,294 INFO L82 PathProgramCache]: Analyzing trace with hash 6691, now seen corresponding path program 1 times [2021-03-24 22:12:12,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:12,294 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893239345] [2021-03-24 22:12:12,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:12,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:12,299 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:12,299 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:12,302 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 22:12:12,302 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893239345] [2021-03-24 22:12:12,302 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:12,302 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:12,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675724053] [2021-03-24 22:12:12,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:12,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:12,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:12,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:12,303 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 37 [2021-03-24 22:12:12,303 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 19 transitions, 134 flow. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 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 22:12:12,303 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:12,304 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 37 [2021-03-24 22:12:12,304 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:12,400 INFO L129 PetriNetUnfolder]: 769/1034 cut-off events. [2021-03-24 22:12:12,400 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,404 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2121 conditions, 1034 events. 769/1034 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 4476 event pairs, 769 based on Foata normal form. 264/1223 useless extension candidates. Maximal degree in co-relation 2048. Up to 1025 conditions per place. [2021-03-24 22:12:12,411 INFO L132 encePairwiseOnDemand]: 35/37 looper letters, 8 selfloop transitions, 1 changer transitions 0/18 dead transitions. [2021-03-24 22:12:12,411 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 18 transitions, 150 flow [2021-03-24 22:12:12,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:12,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:12,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 64 transitions. [2021-03-24 22:12:12,412 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5765765765765766 [2021-03-24 22:12:12,413 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 64 transitions. [2021-03-24 22:12:12,413 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 64 transitions. [2021-03-24 22:12:12,413 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:12,413 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 64 transitions. [2021-03-24 22:12:12,413 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 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 22:12:12,414 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 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 22:12:12,414 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 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 22:12:12,414 INFO L185 Difference]: Start difference. First operand has 36 places, 19 transitions, 134 flow. Second operand 3 states and 64 transitions. [2021-03-24 22:12:12,414 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 18 transitions, 150 flow [2021-03-24 22:12:12,415 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 18 transitions, 94 flow, removed 28 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:12,416 INFO L241 Difference]: Finished difference. Result has 37 places, 18 transitions, 78 flow [2021-03-24 22:12:12,416 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=37, PETRI_DIFFERENCE_MINUEND_FLOW=76, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=78, PETRI_PLACES=37, PETRI_TRANSITIONS=18} [2021-03-24 22:12:12,416 INFO L343 CegarLoopForPetriNet]: 36 programPoint places, 1 predicate places. [2021-03-24 22:12:12,416 INFO L480 AbstractCegarLoop]: Abstraction has has 37 places, 18 transitions, 78 flow [2021-03-24 22:12:12,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 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 22:12:12,416 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:12,416 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:12,417 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-03-24 22:12:12,417 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:12,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:12,417 INFO L82 PathProgramCache]: Analyzing trace with hash -2053304524, now seen corresponding path program 1 times [2021-03-24 22:12:12,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:12,417 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470750609] [2021-03-24 22:12:12,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:12,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:12,421 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:12,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:12,423 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:12,464 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:12,464 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:12,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-03-24 22:12:12,465 WARN L342 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:12,465 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2021-03-24 22:12:12,478 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:12,478 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:12,479 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:12,479 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:12,479 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:12,479 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:12,479 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:12,479 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:12,479 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:12,480 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:12,480 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 51 places, 32 transitions, 181 flow [2021-03-24 22:12:12,484 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-24 22:12:12,484 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,484 INFO L84 FinitePrefix]: Finished finitePrefix Result has 132 conditions, 59 events. 0/59 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 212 event pairs, 0 based on Foata normal form. 0/49 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-24 22:12:12,485 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 32 transitions, 181 flow [2021-03-24 22:12:12,485 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 30 transitions, 177 flow [2021-03-24 22:12:12,485 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:12,485 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-24 22:12:12,485 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-24 22:12:12,486 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 30 transitions, 177 flow [2021-03-24 22:12:12,488 INFO L129 PetriNetUnfolder]: 0/39 cut-off events. [2021-03-24 22:12:12,488 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,488 INFO L84 FinitePrefix]: Finished finitePrefix Result has 112 conditions, 39 events. 0/39 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 100 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-24 22:12:12,489 INFO L142 LiptonReduction]: Number of co-enabled transitions 504 [2021-03-24 22:12:12,702 INFO L154 LiptonReduction]: Checked pairs total: 198 [2021-03-24 22:12:12,702 INFO L156 LiptonReduction]: Total number of compositions: 9 [2021-03-24 22:12:12,702 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 217 [2021-03-24 22:12:12,703 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 22:12:12,703 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,703 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:12,704 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:12,704 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:12,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:12,704 INFO L82 PathProgramCache]: Analyzing trace with hash 7971, now seen corresponding path program 1 times [2021-03-24 22:12:12,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:12,704 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752502757] [2021-03-24 22:12:12,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:12,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:12,711 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:12,712 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:12,714 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 22:12:12,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752502757] [2021-03-24 22:12:12,714 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:12,714 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:12,714 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939090483] [2021-03-24 22:12:12,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:12,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:12,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:12,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:12,715 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 41 [2021-03-24 22:12:12,715 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 40 places, 21 transitions, 159 flow. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:12,715 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:12,716 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 41 [2021-03-24 22:12:12,716 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:12,939 INFO L129 PetriNetUnfolder]: 1793/2315 cut-off events. [2021-03-24 22:12:12,939 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:12,946 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4694 conditions, 2315 events. 1793/2315 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 233. Compared 10434 event pairs, 1793 based on Foata normal form. 521/2705 useless extension candidates. Maximal degree in co-relation 4608. Up to 2305 conditions per place. [2021-03-24 22:12:12,961 INFO L132 encePairwiseOnDemand]: 39/41 looper letters, 9 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2021-03-24 22:12:12,961 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 20 transitions, 177 flow [2021-03-24 22:12:12,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:12,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:12,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 71 transitions. [2021-03-24 22:12:12,964 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5772357723577236 [2021-03-24 22:12:12,964 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 71 transitions. [2021-03-24 22:12:12,964 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 71 transitions. [2021-03-24 22:12:12,964 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:12,964 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 71 transitions. [2021-03-24 22:12:12,965 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 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 22:12:12,966 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 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 22:12:12,966 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 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 22:12:12,966 INFO L185 Difference]: Start difference. First operand has 40 places, 21 transitions, 159 flow. Second operand 3 states and 71 transitions. [2021-03-24 22:12:12,966 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 20 transitions, 177 flow [2021-03-24 22:12:12,969 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 20 transitions, 105 flow, removed 36 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:12,969 INFO L241 Difference]: Finished difference. Result has 41 places, 20 transitions, 87 flow [2021-03-24 22:12:12,969 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=41, PETRI_DIFFERENCE_MINUEND_FLOW=85, PETRI_DIFFERENCE_MINUEND_PLACES=39, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=87, PETRI_PLACES=41, PETRI_TRANSITIONS=20} [2021-03-24 22:12:12,969 INFO L343 CegarLoopForPetriNet]: 40 programPoint places, 1 predicate places. [2021-03-24 22:12:12,970 INFO L480 AbstractCegarLoop]: Abstraction has has 41 places, 20 transitions, 87 flow [2021-03-24 22:12:12,970 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:12,970 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:12,970 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:12,970 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-03-24 22:12:12,970 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:12,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:12,970 INFO L82 PathProgramCache]: Analyzing trace with hash -607272555, now seen corresponding path program 1 times [2021-03-24 22:12:12,970 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:12,971 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930473216] [2021-03-24 22:12:12,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:12,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:12,984 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:12,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:12,990 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:12,992 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:12,992 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:12,992 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-03-24 22:12:12,992 WARN L342 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:12,992 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2021-03-24 22:12:13,006 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:13,007 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:13,009 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:13,009 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:13,009 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:13,009 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:13,009 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:13,009 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:13,009 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:13,009 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:13,011 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 56 places, 35 transitions, 210 flow [2021-03-24 22:12:13,016 INFO L129 PetriNetUnfolder]: 0/65 cut-off events. [2021-03-24 22:12:13,016 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:13,017 INFO L84 FinitePrefix]: Finished finitePrefix Result has 151 conditions, 65 events. 0/65 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 234 event pairs, 0 based on Foata normal form. 0/54 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-24 22:12:13,017 INFO L82 GeneralOperation]: Start removeDead. Operand has 56 places, 35 transitions, 210 flow [2021-03-24 22:12:13,017 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 54 places, 33 transitions, 206 flow [2021-03-24 22:12:13,017 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:13,017 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-24 22:12:13,018 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-24 22:12:13,018 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 54 places, 33 transitions, 206 flow [2021-03-24 22:12:13,022 INFO L129 PetriNetUnfolder]: 0/43 cut-off events. [2021-03-24 22:12:13,022 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:13,022 INFO L84 FinitePrefix]: Finished finitePrefix Result has 129 conditions, 43 events. 0/43 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 110 event pairs, 0 based on Foata normal form. 0/43 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-24 22:12:13,023 INFO L142 LiptonReduction]: Number of co-enabled transitions 620 [2021-03-24 22:12:13,305 INFO L154 LiptonReduction]: Checked pairs total: 245 [2021-03-24 22:12:13,305 INFO L156 LiptonReduction]: Total number of compositions: 10 [2021-03-24 22:12:13,305 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 288 [2021-03-24 22:12:13,306 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:12:13,306 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:13,306 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:13,306 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:13,306 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:13,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:13,306 INFO L82 PathProgramCache]: Analyzing trace with hash 9379, now seen corresponding path program 1 times [2021-03-24 22:12:13,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:13,307 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364807589] [2021-03-24 22:12:13,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:13,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:13,312 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:13,312 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:13,314 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 22:12:13,314 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364807589] [2021-03-24 22:12:13,314 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:13,315 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:13,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904829386] [2021-03-24 22:12:13,315 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:13,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:13,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:13,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:13,316 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 45 [2021-03-24 22:12:13,316 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 23 transitions, 186 flow. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:13,317 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:13,317 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 45 [2021-03-24 22:12:13,317 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:13,769 INFO L129 PetriNetUnfolder]: 4097/5132 cut-off events. [2021-03-24 22:12:13,769 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:13,785 INFO L84 FinitePrefix]: Finished finitePrefix Result has 10340 conditions, 5132 events. 4097/5132 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 456. Compared 23250 event pairs, 4097 based on Foata normal form. 1034/5949 useless extension candidates. Maximal degree in co-relation 10240. Up to 5121 conditions per place. [2021-03-24 22:12:13,851 INFO L132 encePairwiseOnDemand]: 43/45 looper letters, 10 selfloop transitions, 1 changer transitions 0/22 dead transitions. [2021-03-24 22:12:13,851 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 22 transitions, 206 flow [2021-03-24 22:12:13,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:13,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:13,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 78 transitions. [2021-03-24 22:12:13,852 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5777777777777777 [2021-03-24 22:12:13,852 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 78 transitions. [2021-03-24 22:12:13,852 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 78 transitions. [2021-03-24 22:12:13,853 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:13,853 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 78 transitions. [2021-03-24 22:12:13,853 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:13,853 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 45.0) internal successors, (180), 4 states have internal predecessors, (180), 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 22:12:13,854 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 45.0) internal successors, (180), 4 states have internal predecessors, (180), 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 22:12:13,854 INFO L185 Difference]: Start difference. First operand has 44 places, 23 transitions, 186 flow. Second operand 3 states and 78 transitions. [2021-03-24 22:12:13,854 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 22 transitions, 206 flow [2021-03-24 22:12:13,855 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 22 transitions, 116 flow, removed 45 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:13,855 INFO L241 Difference]: Finished difference. Result has 45 places, 22 transitions, 96 flow [2021-03-24 22:12:13,856 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=45, PETRI_DIFFERENCE_MINUEND_FLOW=94, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=96, PETRI_PLACES=45, PETRI_TRANSITIONS=22} [2021-03-24 22:12:13,856 INFO L343 CegarLoopForPetriNet]: 44 programPoint places, 1 predicate places. [2021-03-24 22:12:13,856 INFO L480 AbstractCegarLoop]: Abstraction has has 45 places, 22 transitions, 96 flow [2021-03-24 22:12:13,856 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:13,856 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:13,856 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:13,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-03-24 22:12:13,856 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:13,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:13,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1208304905, now seen corresponding path program 1 times [2021-03-24 22:12:13,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:13,857 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583117295] [2021-03-24 22:12:13,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:13,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:13,860 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:13,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:13,862 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:13,863 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:13,863 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:13,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-03-24 22:12:13,863 WARN L342 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:13,864 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2021-03-24 22:12:13,882 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:13,882 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:13,883 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:13,883 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:13,883 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:13,883 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:13,883 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:13,883 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:13,883 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:13,883 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:13,885 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 38 transitions, 241 flow [2021-03-24 22:12:13,890 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-24 22:12:13,890 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:13,890 INFO L84 FinitePrefix]: Finished finitePrefix Result has 171 conditions, 71 events. 0/71 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 257 event pairs, 0 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-24 22:12:13,890 INFO L82 GeneralOperation]: Start removeDead. Operand has 61 places, 38 transitions, 241 flow [2021-03-24 22:12:13,890 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 36 transitions, 237 flow [2021-03-24 22:12:13,891 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:13,891 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-24 22:12:13,891 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-24 22:12:13,891 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 59 places, 36 transitions, 237 flow [2021-03-24 22:12:13,894 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-24 22:12:13,894 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:13,894 INFO L84 FinitePrefix]: Finished finitePrefix Result has 147 conditions, 47 events. 0/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 142 event pairs, 0 based on Foata normal form. 0/47 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-24 22:12:13,895 INFO L142 LiptonReduction]: Number of co-enabled transitions 748 [2021-03-24 22:12:14,195 INFO L154 LiptonReduction]: Checked pairs total: 297 [2021-03-24 22:12:14,196 INFO L156 LiptonReduction]: Total number of compositions: 11 [2021-03-24 22:12:14,196 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 305 [2021-03-24 22:12:14,197 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 22:12:14,197 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:14,197 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:14,197 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:14,197 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:14,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:14,198 INFO L82 PathProgramCache]: Analyzing trace with hash 10915, now seen corresponding path program 1 times [2021-03-24 22:12:14,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:14,198 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056866895] [2021-03-24 22:12:14,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:14,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:14,210 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:14,211 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:14,213 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 22:12:14,213 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056866895] [2021-03-24 22:12:14,214 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:14,214 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:14,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516741544] [2021-03-24 22:12:14,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:14,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:14,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:14,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:14,215 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 49 [2021-03-24 22:12:14,215 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 25 transitions, 215 flow. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:14,215 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:14,215 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 49 [2021-03-24 22:12:14,215 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:15,204 INFO L129 PetriNetUnfolder]: 9217/11277 cut-off events. [2021-03-24 22:12:15,204 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:15,250 INFO L84 FinitePrefix]: Finished finitePrefix Result has 22643 conditions, 11277 events. 9217/11277 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 891. Compared 52532 event pairs, 9217 based on Foata normal form. 2059/12977 useless extension candidates. Maximal degree in co-relation 22528. Up to 11265 conditions per place. [2021-03-24 22:12:15,354 INFO L132 encePairwiseOnDemand]: 47/49 looper letters, 11 selfloop transitions, 1 changer transitions 0/24 dead transitions. [2021-03-24 22:12:15,354 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 24 transitions, 237 flow [2021-03-24 22:12:15,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:15,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:15,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 85 transitions. [2021-03-24 22:12:15,356 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5782312925170068 [2021-03-24 22:12:15,356 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 85 transitions. [2021-03-24 22:12:15,356 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 85 transitions. [2021-03-24 22:12:15,356 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:15,356 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 85 transitions. [2021-03-24 22:12:15,356 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 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 22:12:15,357 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 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 22:12:15,357 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 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 22:12:15,357 INFO L185 Difference]: Start difference. First operand has 48 places, 25 transitions, 215 flow. Second operand 3 states and 85 transitions. [2021-03-24 22:12:15,357 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 24 transitions, 237 flow [2021-03-24 22:12:15,359 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 24 transitions, 127 flow, removed 55 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:15,359 INFO L241 Difference]: Finished difference. Result has 49 places, 24 transitions, 105 flow [2021-03-24 22:12:15,359 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=49, PETRI_DIFFERENCE_MINUEND_FLOW=103, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=105, PETRI_PLACES=49, PETRI_TRANSITIONS=24} [2021-03-24 22:12:15,359 INFO L343 CegarLoopForPetriNet]: 48 programPoint places, 1 predicate places. [2021-03-24 22:12:15,360 INFO L480 AbstractCegarLoop]: Abstraction has has 49 places, 24 transitions, 105 flow [2021-03-24 22:12:15,360 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:15,360 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:15,360 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:15,360 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-03-24 22:12:15,360 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:15,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:15,361 INFO L82 PathProgramCache]: Analyzing trace with hash 941462544, now seen corresponding path program 1 times [2021-03-24 22:12:15,361 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:15,361 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299241023] [2021-03-24 22:12:15,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:15,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:15,365 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:15,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:15,366 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:15,368 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:15,368 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:15,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-03-24 22:12:15,369 WARN L342 ceAbstractionStarter]: 11 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:15,369 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 12 thread instances. [2021-03-24 22:12:15,385 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:15,385 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:15,386 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:15,386 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:15,386 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:15,386 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:15,386 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:15,386 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:15,386 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:15,386 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:15,387 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 66 places, 41 transitions, 274 flow [2021-03-24 22:12:15,391 INFO L129 PetriNetUnfolder]: 0/77 cut-off events. [2021-03-24 22:12:15,392 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:15,392 INFO L84 FinitePrefix]: Finished finitePrefix Result has 192 conditions, 77 events. 0/77 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 294 event pairs, 0 based on Foata normal form. 0/64 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-24 22:12:15,392 INFO L82 GeneralOperation]: Start removeDead. Operand has 66 places, 41 transitions, 274 flow [2021-03-24 22:12:15,393 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 39 transitions, 270 flow [2021-03-24 22:12:15,393 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:15,393 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-24 22:12:15,393 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-24 22:12:15,393 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 64 places, 39 transitions, 270 flow [2021-03-24 22:12:15,397 INFO L129 PetriNetUnfolder]: 0/51 cut-off events. [2021-03-24 22:12:15,397 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:15,397 INFO L84 FinitePrefix]: Finished finitePrefix Result has 166 conditions, 51 events. 0/51 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 153 event pairs, 0 based on Foata normal form. 0/51 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-24 22:12:15,398 INFO L142 LiptonReduction]: Number of co-enabled transitions 888 [2021-03-24 22:12:15,730 INFO L154 LiptonReduction]: Checked pairs total: 354 [2021-03-24 22:12:15,730 INFO L156 LiptonReduction]: Total number of compositions: 12 [2021-03-24 22:12:15,730 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 337 [2021-03-24 22:12:15,731 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 22:12:15,731 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:15,731 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:15,731 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:15,731 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:15,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:15,732 INFO L82 PathProgramCache]: Analyzing trace with hash 12579, now seen corresponding path program 1 times [2021-03-24 22:12:15,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:15,732 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237967953] [2021-03-24 22:12:15,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:15,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:15,736 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:15,737 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:15,739 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 22:12:15,739 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237967953] [2021-03-24 22:12:15,739 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:15,739 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:15,740 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937536057] [2021-03-24 22:12:15,740 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:15,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:15,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:15,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:15,741 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 53 [2021-03-24 22:12:15,741 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 27 transitions, 246 flow. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 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 22:12:15,741 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:15,741 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 53 [2021-03-24 22:12:15,741 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:17,993 INFO L129 PetriNetUnfolder]: 20481/24590 cut-off events. [2021-03-24 22:12:17,993 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:18,100 INFO L84 FinitePrefix]: Finished finitePrefix Result has 49283 conditions, 24590 events. 20481/24590 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1750. Compared 115355 event pairs, 20481 based on Foata normal form. 4108/28107 useless extension candidates. Maximal degree in co-relation 49152. Up to 24577 conditions per place. [2021-03-24 22:12:18,291 INFO L132 encePairwiseOnDemand]: 51/53 looper letters, 12 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2021-03-24 22:12:18,292 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 26 transitions, 270 flow [2021-03-24 22:12:18,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:18,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:18,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 92 transitions. [2021-03-24 22:12:18,293 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5786163522012578 [2021-03-24 22:12:18,293 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 92 transitions. [2021-03-24 22:12:18,293 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 92 transitions. [2021-03-24 22:12:18,294 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:18,294 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 92 transitions. [2021-03-24 22:12:18,295 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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 22:12:18,295 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 53.0) internal successors, (212), 4 states have internal predecessors, (212), 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 22:12:18,295 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 53.0) internal successors, (212), 4 states have internal predecessors, (212), 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 22:12:18,295 INFO L185 Difference]: Start difference. First operand has 52 places, 27 transitions, 246 flow. Second operand 3 states and 92 transitions. [2021-03-24 22:12:18,295 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 26 transitions, 270 flow [2021-03-24 22:12:18,297 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 53 places, 26 transitions, 138 flow, removed 66 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:18,297 INFO L241 Difference]: Finished difference. Result has 53 places, 26 transitions, 114 flow [2021-03-24 22:12:18,298 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=53, PETRI_DIFFERENCE_MINUEND_FLOW=112, PETRI_DIFFERENCE_MINUEND_PLACES=51, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=114, PETRI_PLACES=53, PETRI_TRANSITIONS=26} [2021-03-24 22:12:18,298 INFO L343 CegarLoopForPetriNet]: 52 programPoint places, 1 predicate places. [2021-03-24 22:12:18,298 INFO L480 AbstractCegarLoop]: Abstraction has has 53 places, 26 transitions, 114 flow [2021-03-24 22:12:18,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 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 22:12:18,298 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:18,298 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:18,298 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-03-24 22:12:18,298 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:18,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:18,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1127292090, now seen corresponding path program 1 times [2021-03-24 22:12:18,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:18,299 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566157747] [2021-03-24 22:12:18,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:18,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:18,308 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:18,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:18,311 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:18,318 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:18,318 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:18,319 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-03-24 22:12:18,319 WARN L342 ceAbstractionStarter]: 12 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:18,320 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 13 thread instances. [2021-03-24 22:12:18,338 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:18,339 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:18,339 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:18,339 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:18,339 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:18,339 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:18,339 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:18,339 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:18,339 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:18,339 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:18,340 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 71 places, 44 transitions, 309 flow [2021-03-24 22:12:18,346 INFO L129 PetriNetUnfolder]: 0/83 cut-off events. [2021-03-24 22:12:18,347 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:18,347 INFO L84 FinitePrefix]: Finished finitePrefix Result has 214 conditions, 83 events. 0/83 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 304 event pairs, 0 based on Foata normal form. 0/69 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-24 22:12:18,347 INFO L82 GeneralOperation]: Start removeDead. Operand has 71 places, 44 transitions, 309 flow [2021-03-24 22:12:18,347 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 69 places, 42 transitions, 305 flow [2021-03-24 22:12:18,347 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:18,348 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-24 22:12:18,348 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-24 22:12:18,349 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 69 places, 42 transitions, 305 flow [2021-03-24 22:12:18,353 INFO L129 PetriNetUnfolder]: 0/55 cut-off events. [2021-03-24 22:12:18,353 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:18,353 INFO L84 FinitePrefix]: Finished finitePrefix Result has 186 conditions, 55 events. 0/55 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 126 event pairs, 0 based on Foata normal form. 0/55 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-24 22:12:18,354 INFO L142 LiptonReduction]: Number of co-enabled transitions 1040 [2021-03-24 22:12:18,702 INFO L154 LiptonReduction]: Checked pairs total: 416 [2021-03-24 22:12:18,702 INFO L156 LiptonReduction]: Total number of compositions: 13 [2021-03-24 22:12:18,703 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 356 [2021-03-24 22:12:18,704 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:12:18,704 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:18,704 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:18,705 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:18,705 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:18,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:18,705 INFO L82 PathProgramCache]: Analyzing trace with hash 14371, now seen corresponding path program 1 times [2021-03-24 22:12:18,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:18,705 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545986569] [2021-03-24 22:12:18,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:18,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:18,713 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:18,713 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:18,715 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 22:12:18,716 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545986569] [2021-03-24 22:12:18,716 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:18,716 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:18,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419749979] [2021-03-24 22:12:18,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:18,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:18,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:18,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:18,717 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 57 [2021-03-24 22:12:18,717 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 29 transitions, 279 flow. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:18,717 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:18,717 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 57 [2021-03-24 22:12:18,717 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:22,830 INFO L129 PetriNetUnfolder]: 45057/53263 cut-off events. [2021-03-24 22:12:22,830 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:23,302 INFO L84 FinitePrefix]: Finished finitePrefix Result has 106644 conditions, 53263 events. 45057/53263 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3418. Compared 250977 event pairs, 45057 based on Foata normal form. 8205/60501 useless extension candidates. Maximal degree in co-relation 106496. Up to 53249 conditions per place. [2021-03-24 22:12:23,569 INFO L132 encePairwiseOnDemand]: 55/57 looper letters, 13 selfloop transitions, 1 changer transitions 0/28 dead transitions. [2021-03-24 22:12:23,570 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 28 transitions, 305 flow [2021-03-24 22:12:23,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:23,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:23,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2021-03-24 22:12:23,571 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5789473684210527 [2021-03-24 22:12:23,571 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 99 transitions. [2021-03-24 22:12:23,571 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 99 transitions. [2021-03-24 22:12:23,571 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:23,571 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 99 transitions. [2021-03-24 22:12:23,572 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 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 22:12:23,572 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 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 22:12:23,573 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 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 22:12:23,573 INFO L185 Difference]: Start difference. First operand has 56 places, 29 transitions, 279 flow. Second operand 3 states and 99 transitions. [2021-03-24 22:12:23,573 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 28 transitions, 305 flow [2021-03-24 22:12:23,576 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 28 transitions, 149 flow, removed 78 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:23,576 INFO L241 Difference]: Finished difference. Result has 57 places, 28 transitions, 123 flow [2021-03-24 22:12:23,576 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=57, PETRI_DIFFERENCE_MINUEND_FLOW=121, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=123, PETRI_PLACES=57, PETRI_TRANSITIONS=28} [2021-03-24 22:12:23,577 INFO L343 CegarLoopForPetriNet]: 56 programPoint places, 1 predicate places. [2021-03-24 22:12:23,577 INFO L480 AbstractCegarLoop]: Abstraction has has 57 places, 28 transitions, 123 flow [2021-03-24 22:12:23,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:12:23,577 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:23,577 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:23,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-03-24 22:12:23,577 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:23,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:23,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1451810459, now seen corresponding path program 1 times [2021-03-24 22:12:23,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:23,578 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221362956] [2021-03-24 22:12:23,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:23,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:23,589 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:23,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:23,596 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:23,597 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:23,597 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:23,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-03-24 22:12:23,598 WARN L342 ceAbstractionStarter]: 13 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:23,598 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 14 thread instances. [2021-03-24 22:12:23,619 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:23,619 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:23,620 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:23,621 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:23,621 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:23,621 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:23,621 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:23,621 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:23,621 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:23,621 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:23,622 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 76 places, 47 transitions, 346 flow [2021-03-24 22:12:23,627 INFO L129 PetriNetUnfolder]: 0/89 cut-off events. [2021-03-24 22:12:23,627 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:23,627 INFO L84 FinitePrefix]: Finished finitePrefix Result has 237 conditions, 89 events. 0/89 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 346 event pairs, 0 based on Foata normal form. 0/74 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-24 22:12:23,627 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 47 transitions, 346 flow [2021-03-24 22:12:23,628 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 74 places, 45 transitions, 342 flow [2021-03-24 22:12:23,628 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:23,628 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-24 22:12:23,628 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-24 22:12:23,629 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 74 places, 45 transitions, 342 flow [2021-03-24 22:12:23,633 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-24 22:12:23,633 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:23,633 INFO L84 FinitePrefix]: Finished finitePrefix Result has 207 conditions, 59 events. 0/59 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 167 event pairs, 0 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-24 22:12:23,634 INFO L142 LiptonReduction]: Number of co-enabled transitions 1204 [2021-03-24 22:12:24,067 INFO L154 LiptonReduction]: Checked pairs total: 483 [2021-03-24 22:12:24,067 INFO L156 LiptonReduction]: Total number of compositions: 14 [2021-03-24 22:12:24,067 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 439 [2021-03-24 22:12:24,068 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 22:12:24,068 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:24,068 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:24,068 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:24,068 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:24,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:24,069 INFO L82 PathProgramCache]: Analyzing trace with hash 16291, now seen corresponding path program 1 times [2021-03-24 22:12:24,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:24,069 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191811765] [2021-03-24 22:12:24,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:24,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:24,076 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:24,076 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:24,079 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 22:12:24,079 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191811765] [2021-03-24 22:12:24,079 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:24,079 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:24,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928321185] [2021-03-24 22:12:24,079 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:24,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:24,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:24,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:24,080 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 61 [2021-03-24 22:12:24,081 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 31 transitions, 314 flow. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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 22:12:24,081 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:24,081 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 61 [2021-03-24 22:12:24,081 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:12:34,640 INFO L129 PetriNetUnfolder]: 98305/114704 cut-off events. [2021-03-24 22:12:34,640 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:35,943 INFO L84 FinitePrefix]: Finished finitePrefix Result has 229542 conditions, 114704 events. 98305/114704 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6734. Compared 544782 event pairs, 98305 based on Foata normal form. 16398/129530 useless extension candidates. Maximal degree in co-relation 229376. Up to 114689 conditions per place. [2021-03-24 22:12:36,660 INFO L132 encePairwiseOnDemand]: 59/61 looper letters, 14 selfloop transitions, 1 changer transitions 0/30 dead transitions. [2021-03-24 22:12:36,661 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 30 transitions, 342 flow [2021-03-24 22:12:36,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:12:36,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:12:36,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 106 transitions. [2021-03-24 22:12:36,662 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5792349726775956 [2021-03-24 22:12:36,662 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 106 transitions. [2021-03-24 22:12:36,662 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 106 transitions. [2021-03-24 22:12:36,662 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:12:36,662 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 106 transitions. [2021-03-24 22:12:36,662 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 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 22:12:36,663 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 61.0) internal successors, (244), 4 states have internal predecessors, (244), 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 22:12:36,663 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 61.0) internal successors, (244), 4 states have internal predecessors, (244), 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 22:12:36,663 INFO L185 Difference]: Start difference. First operand has 60 places, 31 transitions, 314 flow. Second operand 3 states and 106 transitions. [2021-03-24 22:12:36,663 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 30 transitions, 342 flow [2021-03-24 22:12:36,665 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 30 transitions, 160 flow, removed 91 selfloop flow, removed 0 redundant places. [2021-03-24 22:12:36,665 INFO L241 Difference]: Finished difference. Result has 61 places, 30 transitions, 132 flow [2021-03-24 22:12:36,665 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=61, PETRI_DIFFERENCE_MINUEND_FLOW=130, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=132, PETRI_PLACES=61, PETRI_TRANSITIONS=30} [2021-03-24 22:12:36,665 INFO L343 CegarLoopForPetriNet]: 60 programPoint places, 1 predicate places. [2021-03-24 22:12:36,665 INFO L480 AbstractCegarLoop]: Abstraction has has 61 places, 30 transitions, 132 flow [2021-03-24 22:12:36,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 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 22:12:36,666 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:36,666 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:12:36,666 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-03-24 22:12:36,666 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:36,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:36,666 INFO L82 PathProgramCache]: Analyzing trace with hash -138593667, now seen corresponding path program 1 times [2021-03-24 22:12:36,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:36,666 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403825199] [2021-03-24 22:12:36,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:36,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:36,670 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:36,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:12:36,672 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:12:36,674 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:12:36,674 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:12:36,674 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-03-24 22:12:36,674 WARN L342 ceAbstractionStarter]: 14 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:12:36,674 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 15 thread instances. [2021-03-24 22:12:36,691 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:12:36,691 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:12:36,692 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:12:36,692 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:12:36,692 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:12:36,692 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:12:36,692 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:12:36,692 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:12:36,692 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:12:36,692 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:12:36,693 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 81 places, 50 transitions, 385 flow [2021-03-24 22:12:36,699 INFO L129 PetriNetUnfolder]: 0/95 cut-off events. [2021-03-24 22:12:36,699 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:36,699 INFO L84 FinitePrefix]: Finished finitePrefix Result has 261 conditions, 95 events. 0/95 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 296 event pairs, 0 based on Foata normal form. 0/79 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-24 22:12:36,699 INFO L82 GeneralOperation]: Start removeDead. Operand has 81 places, 50 transitions, 385 flow [2021-03-24 22:12:36,700 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 79 places, 48 transitions, 381 flow [2021-03-24 22:12:36,700 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:12:36,700 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-24 22:12:36,700 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-24 22:12:36,701 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 79 places, 48 transitions, 381 flow [2021-03-24 22:12:36,705 INFO L129 PetriNetUnfolder]: 0/63 cut-off events. [2021-03-24 22:12:36,705 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:36,705 INFO L84 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 63 events. 0/63 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 179 event pairs, 0 based on Foata normal form. 0/63 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-24 22:12:36,706 INFO L142 LiptonReduction]: Number of co-enabled transitions 1380 [2021-03-24 22:12:37,169 INFO L154 LiptonReduction]: Checked pairs total: 555 [2021-03-24 22:12:37,169 INFO L156 LiptonReduction]: Total number of compositions: 15 [2021-03-24 22:12:37,170 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 470 [2021-03-24 22:12:37,171 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 22:12:37,171 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:12:37,171 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:12:37,171 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:12:37,171 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:12:37,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:12:37,171 INFO L82 PathProgramCache]: Analyzing trace with hash 18339, now seen corresponding path program 1 times [2021-03-24 22:12:37,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:12:37,172 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122549787] [2021-03-24 22:12:37,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:12:37,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:12:37,184 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:12:37,185 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:12:37,187 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 22:12:37,187 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122549787] [2021-03-24 22:12:37,187 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:12:37,187 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:12:37,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320837597] [2021-03-24 22:12:37,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:12:37,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:12:37,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:12:37,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:12:37,189 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 65 [2021-03-24 22:12:37,189 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 33 transitions, 351 flow. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 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 22:12:37,189 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:12:37,189 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 65 [2021-03-24 22:12:37,189 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:13:13,046 INFO L129 PetriNetUnfolder]: 212993/245777 cut-off events. [2021-03-24 22:13:13,046 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:13:16,594 INFO L84 FinitePrefix]: Finished finitePrefix Result has 491705 conditions, 245777 events. 212993/245777 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 13156. Compared 1164137 event pairs, 212993 based on Foata normal form. 32783/275999 useless extension candidates. Maximal degree in co-relation 491520. Up to 245761 conditions per place. [2021-03-24 22:13:17,435 INFO L132 encePairwiseOnDemand]: 63/65 looper letters, 15 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2021-03-24 22:13:17,436 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 32 transitions, 381 flow [2021-03-24 22:13:17,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:13:17,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:13:17,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 113 transitions. [2021-03-24 22:13:17,437 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5794871794871795 [2021-03-24 22:13:17,437 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 113 transitions. [2021-03-24 22:13:17,437 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 113 transitions. [2021-03-24 22:13:17,437 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:13:17,437 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 113 transitions. [2021-03-24 22:13:17,438 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 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 22:13:17,438 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 65.0) internal successors, (260), 4 states have internal predecessors, (260), 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 22:13:17,438 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 65.0) internal successors, (260), 4 states have internal predecessors, (260), 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 22:13:17,438 INFO L185 Difference]: Start difference. First operand has 64 places, 33 transitions, 351 flow. Second operand 3 states and 113 transitions. [2021-03-24 22:13:17,439 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 32 transitions, 381 flow [2021-03-24 22:13:17,441 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 32 transitions, 171 flow, removed 105 selfloop flow, removed 0 redundant places. [2021-03-24 22:13:17,441 INFO L241 Difference]: Finished difference. Result has 65 places, 32 transitions, 141 flow [2021-03-24 22:13:17,442 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=65, PETRI_DIFFERENCE_MINUEND_FLOW=139, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=141, PETRI_PLACES=65, PETRI_TRANSITIONS=32} [2021-03-24 22:13:17,442 INFO L343 CegarLoopForPetriNet]: 64 programPoint places, 1 predicate places. [2021-03-24 22:13:17,442 INFO L480 AbstractCegarLoop]: Abstraction has has 65 places, 32 transitions, 141 flow [2021-03-24 22:13:17,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 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 22:13:17,442 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:13:17,442 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:13:17,442 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-03-24 22:13:17,442 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:13:17,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:13:17,443 INFO L82 PathProgramCache]: Analyzing trace with hash -1465640138, now seen corresponding path program 1 times [2021-03-24 22:13:17,443 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:13:17,443 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636615032] [2021-03-24 22:13:17,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:13:17,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:13:17,446 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:13:17,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:13:17,448 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:13:17,450 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:13:17,450 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:13:17,450 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-03-24 22:13:17,450 WARN L342 ceAbstractionStarter]: 15 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:13:17,450 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 16 thread instances. [2021-03-24 22:13:17,466 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:13:17,467 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:13:17,467 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:13:17,467 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:13:17,467 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:13:17,467 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:13:17,468 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:13:17,468 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:13:17,468 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:13:17,468 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:13:17,468 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 86 places, 53 transitions, 426 flow [2021-03-24 22:13:17,474 INFO L129 PetriNetUnfolder]: 0/101 cut-off events. [2021-03-24 22:13:17,474 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:13:17,474 INFO L84 FinitePrefix]: Finished finitePrefix Result has 286 conditions, 101 events. 0/101 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 329 event pairs, 0 based on Foata normal form. 0/84 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-24 22:13:17,475 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 53 transitions, 426 flow [2021-03-24 22:13:17,475 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 84 places, 51 transitions, 422 flow [2021-03-24 22:13:17,475 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:13:17,475 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-24 22:13:17,475 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-24 22:13:17,476 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 84 places, 51 transitions, 422 flow [2021-03-24 22:13:17,480 INFO L129 PetriNetUnfolder]: 0/67 cut-off events. [2021-03-24 22:13:17,480 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:13:17,480 INFO L84 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 67 events. 0/67 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 175 event pairs, 0 based on Foata normal form. 0/67 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-24 22:13:17,482 INFO L142 LiptonReduction]: Number of co-enabled transitions 1568 [2021-03-24 22:13:18,118 INFO L154 LiptonReduction]: Checked pairs total: 632 [2021-03-24 22:13:18,118 INFO L156 LiptonReduction]: Total number of compositions: 16 [2021-03-24 22:13:18,118 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 643 [2021-03-24 22:13:18,119 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 22:13:18,119 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:13:18,119 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:13:18,120 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:13:18,120 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:13:18,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:13:18,120 INFO L82 PathProgramCache]: Analyzing trace with hash 20515, now seen corresponding path program 1 times [2021-03-24 22:13:18,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:13:18,120 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684945813] [2021-03-24 22:13:18,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:13:18,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:13:18,125 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:13:18,125 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:13:18,127 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 22:13:18,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684945813] [2021-03-24 22:13:18,128 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:13:18,128 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:13:18,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64603770] [2021-03-24 22:13:18,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:13:18,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:13:18,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:13:18,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:13:18,129 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 34 out of 69 [2021-03-24 22:13:18,129 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 68 places, 35 transitions, 390 flow. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 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) [2021-03-24 22:13:18,129 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:13:18,129 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 34 of 69 [2021-03-24 22:13:18,129 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:14:55,794 INFO L129 PetriNetUnfolder]: 458753/524306 cut-off events. [2021-03-24 22:14:55,794 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:15:02,454 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1048781 conditions, 524306 events. 458753/524306 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 25986. Compared 2516437 event pairs, 458753 based on Foata normal form. 65552/585703 useless extension candidates. Maximal degree in co-relation 1048576. Up to 524289 conditions per place. [2021-03-24 22:15:04,280 INFO L132 encePairwiseOnDemand]: 67/69 looper letters, 16 selfloop transitions, 1 changer transitions 0/34 dead transitions. [2021-03-24 22:15:04,280 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 34 transitions, 422 flow [2021-03-24 22:15:04,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:15:04,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:15:04,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 120 transitions. [2021-03-24 22:15:04,281 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5797101449275363 [2021-03-24 22:15:04,281 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 120 transitions. [2021-03-24 22:15:04,281 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 120 transitions. [2021-03-24 22:15:04,282 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:15:04,283 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 120 transitions. [2021-03-24 22:15:04,284 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 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 22:15:04,284 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 69.0) internal successors, (276), 4 states have internal predecessors, (276), 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 22:15:04,285 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 69.0) internal successors, (276), 4 states have internal predecessors, (276), 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 22:15:04,285 INFO L185 Difference]: Start difference. First operand has 68 places, 35 transitions, 390 flow. Second operand 3 states and 120 transitions. [2021-03-24 22:15:04,285 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 34 transitions, 422 flow [2021-03-24 22:15:04,287 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 34 transitions, 182 flow, removed 120 selfloop flow, removed 0 redundant places. [2021-03-24 22:15:04,287 INFO L241 Difference]: Finished difference. Result has 69 places, 34 transitions, 150 flow [2021-03-24 22:15:04,288 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=69, PETRI_DIFFERENCE_MINUEND_FLOW=148, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=34, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=33, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=150, PETRI_PLACES=69, PETRI_TRANSITIONS=34} [2021-03-24 22:15:04,288 INFO L343 CegarLoopForPetriNet]: 68 programPoint places, 1 predicate places. [2021-03-24 22:15:04,288 INFO L480 AbstractCegarLoop]: Abstraction has has 69 places, 34 transitions, 150 flow [2021-03-24 22:15:04,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 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) [2021-03-24 22:15:04,288 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:15:04,288 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:15:04,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-03-24 22:15:04,288 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:15:04,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:15:04,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1833507392, now seen corresponding path program 1 times [2021-03-24 22:15:04,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:15:04,289 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739641741] [2021-03-24 22:15:04,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:15:04,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:15:04,292 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:15:04,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:15:04,293 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:15:04,295 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:15:04,295 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:15:04,295 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-03-24 22:15:04,295 WARN L342 ceAbstractionStarter]: 16 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:15:04,295 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 17 thread instances. [2021-03-24 22:15:04,319 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:15:04,320 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 22:15:04,320 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:15:04,320 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:15:04,320 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:15:04,320 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:15:04,320 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:15:04,320 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:15:04,321 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:15:04,321 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:15:04,321 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 91 places, 56 transitions, 469 flow [2021-03-24 22:15:04,328 INFO L129 PetriNetUnfolder]: 0/107 cut-off events. [2021-03-24 22:15:04,328 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:15:04,328 INFO L84 FinitePrefix]: Finished finitePrefix Result has 312 conditions, 107 events. 0/107 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 345 event pairs, 0 based on Foata normal form. 0/89 useless extension candidates. Maximal degree in co-relation 0. Up to 18 conditions per place. [2021-03-24 22:15:04,328 INFO L82 GeneralOperation]: Start removeDead. Operand has 91 places, 56 transitions, 469 flow [2021-03-24 22:15:04,330 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 89 places, 54 transitions, 465 flow [2021-03-24 22:15:04,330 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:15:04,330 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-24 22:15:04,330 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-24 22:15:04,331 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 89 places, 54 transitions, 465 flow [2021-03-24 22:15:04,334 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-24 22:15:04,334 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:15:04,334 INFO L84 FinitePrefix]: Finished finitePrefix Result has 276 conditions, 71 events. 0/71 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 185 event pairs, 0 based on Foata normal form. 0/71 useless extension candidates. Maximal degree in co-relation 0. Up to 18 conditions per place. [2021-03-24 22:15:04,335 INFO L142 LiptonReduction]: Number of co-enabled transitions 1768 [2021-03-24 22:15:04,917 INFO L154 LiptonReduction]: Checked pairs total: 714 [2021-03-24 22:15:04,917 INFO L156 LiptonReduction]: Total number of compositions: 17 [2021-03-24 22:15:04,917 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 587 [2021-03-24 22:15:04,918 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 22:15:04,918 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:15:04,918 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:15:04,918 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 22:15:04,918 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:15:04,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:15:04,918 INFO L82 PathProgramCache]: Analyzing trace with hash 22819, now seen corresponding path program 1 times [2021-03-24 22:15:04,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:15:04,919 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611722130] [2021-03-24 22:15:04,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:15:04,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:15:04,924 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:15:04,924 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:15:04,927 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 22:15:04,927 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611722130] [2021-03-24 22:15:04,927 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:15:04,927 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:15:04,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135716817] [2021-03-24 22:15:04,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:15:04,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:15:04,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:15:04,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:15:04,928 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 73 [2021-03-24 22:15:04,928 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 37 transitions, 431 flow. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 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 22:15:04,929 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:15:04,929 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 73 [2021-03-24 22:15:04,929 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand