/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-RepeatedSemanticLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-25 17:39:32,156 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-25 17:39:32,159 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-25 17:39:32,197 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-25 17:39:32,255 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-RepeatedSemanticLbe.epf [2021-03-25 17:39:32,288 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-25 17:39:32,288 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-25 17:39:32,291 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-25 17:39:32,292 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-25 17:39:32,292 INFO L138 SettingsManager]: * Use SBE=true [2021-03-25 17:39:32,292 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-25 17:39:32,292 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-25 17:39:32,292 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-25 17:39:32,292 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-25 17:39:32,293 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-25 17:39:32,293 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-25 17:39:32,293 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-25 17:39:32,294 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-25 17:39:32,294 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-25 17:39:32,294 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-25 17:39:32,294 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-25 17:39:32,294 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-25 17:39:32,294 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-25 17:39:32,294 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-25 17:39:32,295 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-25 17:39:32,295 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-25 17:39:32,295 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-25 17:39:32,295 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-25 17:39:32,295 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-25 17:39:32,295 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-25 17:39:32,296 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-25 17:39:32,296 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-25 17:39:32,296 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-25 17:39:32,296 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-03-25 17:39:32,296 INFO L138 SettingsManager]: * Apply repeated Lipton Reduction=true WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-25 17:39:32,609 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-25 17:39:32,627 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-25 17:39:32,629 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-25 17:39:32,630 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-25 17:39:32,631 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-25 17:39:32,632 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl [2021-03-25 17:39:32,632 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl' [2021-03-25 17:39:32,658 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-25 17:39:32,659 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-25 17:39:32,660 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-25 17:39:32,660 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-25 17:39:32,661 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-25 17:39:32,676 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 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,681 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 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,686 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-25 17:39:32,687 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-25 17:39:32,687 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-25 17:39:32,688 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-25 17:39:32,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,696 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,696 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,697 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,699 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,699 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/1) ... [2021-03-25 17:39:32,700 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-25 17:39:32,701 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-25 17:39:32,701 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-25 17:39:32,701 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-25 17:39:32,704 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-25 17:39:32,750 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-25 17:39:32,750 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-25 17:39:32,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-25 17:39:32,751 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-03-25 17:39:32,751 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-03-25 17:39:32,751 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-03-25 17:39:32,751 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-25 17:39:32,828 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-25 17:39:32,828 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-25 17:39:32,829 INFO L202 PluginConnector]: Adding new model fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 05:39:32 BoogieIcfgContainer [2021-03-25 17:39:32,829 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-25 17:39:32,830 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-25 17:39:32,830 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-25 17:39:32,832 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-25 17:39:32,832 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:39:32" (1/2) ... [2021-03-25 17:39:32,833 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3da3580 and model type fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.03 05:39:32, skipping insertion in model container [2021-03-25 17:39:32,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 05:39:32" (2/2) ... [2021-03-25 17:39:32,847 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_inc.bpl [2021-03-25 17:39:32,855 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-25 17:39:32,858 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-25 17:39:32,859 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-25 17:39:32,875 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:32,886 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:32,901 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:32,901 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:32,901 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:32,901 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:32,901 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:32,901 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:32,902 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:32,902 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:32,908 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 8 transitions, 21 flow [2021-03-25 17:39:32,920 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-25 17:39:32,920 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:32,921 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. [2021-03-25 17:39:32,922 INFO L82 GeneralOperation]: Start removeDead. Operand has 11 places, 8 transitions, 21 flow [2021-03-25 17:39:32,924 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 9 places, 6 transitions, 17 flow [2021-03-25 17:39:32,925 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:32,935 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-25 17:39:32,938 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-25 17:39:32,938 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 6 transitions, 17 flow [2021-03-25 17:39:32,940 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-25 17:39:32,941 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:32,941 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. [2021-03-25 17:39:32,942 INFO L142 LiptonReduction]: Number of co-enabled transitions 8 [2021-03-25 17:39:32,966 INFO L154 LiptonReduction]: Checked pairs total: 2 [2021-03-25 17:39:32,966 INFO L156 LiptonReduction]: Total number of compositions: 1 [2021-03-25 17:39:32,968 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 44 [2021-03-25 17:39:32,974 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 17:39:32,974 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:32,974 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:32,975 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:32,975 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:32,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:32,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1315, now seen corresponding path program 1 times [2021-03-25 17:39:32,986 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:32,987 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024312313] [2021-03-25 17:39:32,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:33,058 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:33,059 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:33,088 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:33,089 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024312313] [2021-03-25 17:39:33,089 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:33,089 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:33,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764385717] [2021-03-25 17:39:33,094 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:33,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:33,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:33,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:33,104 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 9 [2021-03-25 17:39:33,105 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) [2021-03-25 17:39:33,105 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:33,105 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 9 [2021-03-25 17:39:33,105 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:33,114 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-25 17:39:33,114 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,114 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. [2021-03-25 17:39:33,115 INFO L132 encePairwiseOnDemand]: 7/9 looper letters, 1 selfloop transitions, 1 changer transitions 0/4 dead transitions. [2021-03-25 17:39:33,115 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 9 places, 4 transitions, 17 flow [2021-03-25 17:39:33,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:33,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:33,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 15 transitions. [2021-03-25 17:39:33,124 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5555555555555556 [2021-03-25 17:39:33,124 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 15 transitions. [2021-03-25 17:39:33,125 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 15 transitions. [2021-03-25 17:39:33,125 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:33,127 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 15 transitions. [2021-03-25 17:39:33,129 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) [2021-03-25 17:39:33,131 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) [2021-03-25 17:39:33,132 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) [2021-03-25 17:39:33,133 INFO L185 Difference]: Start difference. First operand has 8 places, 5 transitions, 15 flow. Second operand 3 states and 15 transitions. [2021-03-25 17:39:33,134 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 9 places, 4 transitions, 17 flow [2021-03-25 17:39:33,136 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 9 places, 4 transitions, 17 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:33,137 INFO L241 Difference]: Finished difference. Result has 9 places, 4 transitions, 15 flow [2021-03-25 17:39:33,138 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} [2021-03-25 17:39:33,139 INFO L343 CegarLoopForPetriNet]: 8 programPoint places, 1 predicate places. [2021-03-25 17:39:33,139 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,139 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 4 transitions, 15 flow [2021-03-25 17:39:33,139 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 4 transitions, 15 flow [2021-03-25 17:39:33,140 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 4 transitions, 15 flow [2021-03-25 17:39:33,141 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-25 17:39:33,141 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,141 INFO L84 FinitePrefix]: Finished finitePrefix Result has 11 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. 0/4 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-25 17:39:33,142 INFO L142 LiptonReduction]: Number of co-enabled transitions 2 [2021-03-25 17:39:33,142 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:33,142 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:33,142 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 3 [2021-03-25 17:39:33,143 INFO L480 AbstractCegarLoop]: Abstraction has has 9 places, 4 transitions, 15 flow [2021-03-25 17:39:33,144 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) [2021-03-25 17:39:33,144 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,144 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-25 17:39:33,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-25 17:39:33,144 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,145 INFO L82 PathProgramCache]: Analyzing trace with hash 41033, now seen corresponding path program 1 times [2021-03-25 17:39:33,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,145 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022490568] [2021-03-25 17:39:33,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,149 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,151 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,160 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:33,161 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:33,161 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-25 17:39:33,162 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:33,163 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-25 17:39:33,168 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:33,168 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:33,170 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:33,170 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:33,170 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:33,170 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:33,170 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:33,170 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:33,170 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:33,171 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:33,171 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 16 places, 11 transitions, 34 flow [2021-03-25 17:39:33,178 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-25 17:39:33,178 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,179 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. [2021-03-25 17:39:33,179 INFO L82 GeneralOperation]: Start removeDead. Operand has 16 places, 11 transitions, 34 flow [2021-03-25 17:39:33,179 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 9 transitions, 30 flow [2021-03-25 17:39:33,179 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,180 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-25 17:39:33,180 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-25 17:39:33,180 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 14 places, 9 transitions, 30 flow [2021-03-25 17:39:33,183 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-25 17:39:33,183 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,183 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. [2021-03-25 17:39:33,184 INFO L142 LiptonReduction]: Number of co-enabled transitions 28 [2021-03-25 17:39:33,255 INFO L154 LiptonReduction]: Checked pairs total: 9 [2021-03-25 17:39:33,255 INFO L156 LiptonReduction]: Total number of compositions: 2 [2021-03-25 17:39:33,255 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 76 [2021-03-25 17:39:33,257 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:39:33,257 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,257 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,257 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:33,257 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1699, now seen corresponding path program 1 times [2021-03-25 17:39:33,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,258 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903668521] [2021-03-25 17:39:33,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:33,280 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:33,280 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:33,285 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:33,285 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903668521] [2021-03-25 17:39:33,285 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:33,285 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:33,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345535063] [2021-03-25 17:39:33,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:33,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:33,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:33,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:33,288 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 13 [2021-03-25 17:39:33,288 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) [2021-03-25 17:39:33,289 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:33,289 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 13 [2021-03-25 17:39:33,289 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:33,299 INFO L129 PetriNetUnfolder]: 1/8 cut-off events. [2021-03-25 17:39:33,299 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,301 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. [2021-03-25 17:39:33,301 INFO L132 encePairwiseOnDemand]: 11/13 looper letters, 2 selfloop transitions, 1 changer transitions 0/6 dead transitions. [2021-03-25 17:39:33,301 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 13 places, 6 transitions, 30 flow [2021-03-25 17:39:33,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:33,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:33,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 22 transitions. [2021-03-25 17:39:33,302 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5641025641025641 [2021-03-25 17:39:33,302 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 22 transitions. [2021-03-25 17:39:33,303 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 22 transitions. [2021-03-25 17:39:33,303 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:33,303 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 22 transitions. [2021-03-25 17:39:33,303 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) [2021-03-25 17:39:33,304 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) [2021-03-25 17:39:33,304 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) [2021-03-25 17:39:33,304 INFO L185 Difference]: Start difference. First operand has 12 places, 7 transitions, 26 flow. Second operand 3 states and 22 transitions. [2021-03-25 17:39:33,304 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 13 places, 6 transitions, 30 flow [2021-03-25 17:39:33,305 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 13 places, 6 transitions, 28 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:33,305 INFO L241 Difference]: Finished difference. Result has 13 places, 6 transitions, 24 flow [2021-03-25 17:39:33,305 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} [2021-03-25 17:39:33,305 INFO L343 CegarLoopForPetriNet]: 12 programPoint places, 1 predicate places. [2021-03-25 17:39:33,306 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,306 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 13 places, 6 transitions, 24 flow [2021-03-25 17:39:33,306 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 13 places, 6 transitions, 24 flow [2021-03-25 17:39:33,306 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 6 transitions, 24 flow [2021-03-25 17:39:33,308 INFO L129 PetriNetUnfolder]: 0/6 cut-off events. [2021-03-25 17:39:33,308 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,308 INFO L84 FinitePrefix]: Finished finitePrefix Result has 17 conditions, 6 events. 0/6 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 2 event pairs, 0 based on Foata normal form. 0/6 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-25 17:39:33,309 INFO L142 LiptonReduction]: Number of co-enabled transitions 8 [2021-03-25 17:39:33,309 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:33,309 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:33,309 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 3 [2021-03-25 17:39:33,310 INFO L480 AbstractCegarLoop]: Abstraction has has 13 places, 6 transitions, 24 flow [2021-03-25 17:39:33,310 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) [2021-03-25 17:39:33,311 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,311 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-25 17:39:33,311 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-25 17:39:33,311 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,311 INFO L82 PathProgramCache]: Analyzing trace with hash 1643499, now seen corresponding path program 1 times [2021-03-25 17:39:33,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,312 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368286894] [2021-03-25 17:39:33,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,315 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,317 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,318 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:33,318 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:33,318 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-25 17:39:33,319 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:33,320 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-25 17:39:33,326 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:33,326 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:33,328 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:33,328 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:33,328 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:33,328 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:33,328 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:33,328 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:33,328 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:33,328 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:33,329 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 14 transitions, 49 flow [2021-03-25 17:39:33,333 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-25 17:39:33,334 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,334 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. [2021-03-25 17:39:33,334 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 14 transitions, 49 flow [2021-03-25 17:39:33,334 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 19 places, 12 transitions, 45 flow [2021-03-25 17:39:33,334 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,335 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-25 17:39:33,335 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-25 17:39:33,335 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 19 places, 12 transitions, 45 flow [2021-03-25 17:39:33,338 INFO L129 PetriNetUnfolder]: 0/15 cut-off events. [2021-03-25 17:39:33,338 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,338 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. [2021-03-25 17:39:33,339 INFO L142 LiptonReduction]: Number of co-enabled transitions 60 [2021-03-25 17:39:33,390 INFO L154 LiptonReduction]: Checked pairs total: 21 [2021-03-25 17:39:33,391 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-25 17:39:33,391 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 57 [2021-03-25 17:39:33,393 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:39:33,393 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,393 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,393 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:33,393 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,393 INFO L82 PathProgramCache]: Analyzing trace with hash 2211, now seen corresponding path program 1 times [2021-03-25 17:39:33,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,394 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795807849] [2021-03-25 17:39:33,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:33,400 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:33,400 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:33,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:33,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795807849] [2021-03-25 17:39:33,403 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:33,403 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:33,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288364795] [2021-03-25 17:39:33,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:33,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:33,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:33,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:33,405 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 17 [2021-03-25 17:39:33,405 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) [2021-03-25 17:39:33,405 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:33,405 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 17 [2021-03-25 17:39:33,405 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:33,416 INFO L129 PetriNetUnfolder]: 5/17 cut-off events. [2021-03-25 17:39:33,416 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,416 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. [2021-03-25 17:39:33,417 INFO L132 encePairwiseOnDemand]: 15/17 looper letters, 3 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2021-03-25 17:39:33,417 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 8 transitions, 45 flow [2021-03-25 17:39:33,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:33,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:33,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 29 transitions. [2021-03-25 17:39:33,421 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5686274509803921 [2021-03-25 17:39:33,422 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 29 transitions. [2021-03-25 17:39:33,422 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 29 transitions. [2021-03-25 17:39:33,422 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:33,422 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 29 transitions. [2021-03-25 17:39:33,422 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) [2021-03-25 17:39:33,423 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) [2021-03-25 17:39:33,423 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) [2021-03-25 17:39:33,423 INFO L185 Difference]: Start difference. First operand has 16 places, 9 transitions, 39 flow. Second operand 3 states and 29 transitions. [2021-03-25 17:39:33,424 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 8 transitions, 45 flow [2021-03-25 17:39:33,425 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 17 places, 8 transitions, 39 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:33,425 INFO L241 Difference]: Finished difference. Result has 17 places, 8 transitions, 33 flow [2021-03-25 17:39:33,426 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} [2021-03-25 17:39:33,426 INFO L343 CegarLoopForPetriNet]: 16 programPoint places, 1 predicate places. [2021-03-25 17:39:33,426 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,426 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 17 places, 8 transitions, 33 flow [2021-03-25 17:39:33,427 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 17 places, 8 transitions, 33 flow [2021-03-25 17:39:33,427 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 17 places, 8 transitions, 33 flow [2021-03-25 17:39:33,438 INFO L129 PetriNetUnfolder]: 0/8 cut-off events. [2021-03-25 17:39:33,438 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,438 INFO L84 FinitePrefix]: Finished finitePrefix Result has 23 conditions, 8 events. 0/8 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 3 event pairs, 0 based on Foata normal form. 0/8 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-25 17:39:33,438 INFO L142 LiptonReduction]: Number of co-enabled transitions 18 [2021-03-25 17:39:33,439 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:33,439 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:33,439 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 13 [2021-03-25 17:39:33,440 INFO L480 AbstractCegarLoop]: Abstraction has has 17 places, 8 transitions, 33 flow [2021-03-25 17:39:33,440 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) [2021-03-25 17:39:33,440 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,441 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-03-25 17:39:33,441 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-25 17:39:33,441 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,441 INFO L82 PathProgramCache]: Analyzing trace with hash 66279044, now seen corresponding path program 1 times [2021-03-25 17:39:33,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,442 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897954118] [2021-03-25 17:39:33,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,445 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,454 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,457 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:33,457 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:33,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-25 17:39:33,457 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:33,458 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-25 17:39:33,476 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:33,477 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:33,479 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:33,479 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:33,480 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:33,480 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:33,480 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:33,482 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:33,482 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:33,482 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:33,483 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 17 transitions, 66 flow [2021-03-25 17:39:33,493 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-03-25 17:39:33,493 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,493 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. [2021-03-25 17:39:33,494 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 17 transitions, 66 flow [2021-03-25 17:39:33,494 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 15 transitions, 62 flow [2021-03-25 17:39:33,494 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,494 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-25 17:39:33,495 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-25 17:39:33,495 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 15 transitions, 62 flow [2021-03-25 17:39:33,498 INFO L129 PetriNetUnfolder]: 0/19 cut-off events. [2021-03-25 17:39:33,498 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,498 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. [2021-03-25 17:39:33,499 INFO L142 LiptonReduction]: Number of co-enabled transitions 104 [2021-03-25 17:39:33,625 INFO L154 LiptonReduction]: Checked pairs total: 38 [2021-03-25 17:39:33,625 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-25 17:39:33,625 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 131 [2021-03-25 17:39:33,633 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:39:33,634 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,634 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,634 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:33,634 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,634 INFO L82 PathProgramCache]: Analyzing trace with hash 2851, now seen corresponding path program 1 times [2021-03-25 17:39:33,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,635 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154869065] [2021-03-25 17:39:33,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:33,644 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:33,644 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:33,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:33,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154869065] [2021-03-25 17:39:33,648 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:33,648 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:33,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920179882] [2021-03-25 17:39:33,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:33,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:33,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:33,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:33,649 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 21 [2021-03-25 17:39:33,650 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) [2021-03-25 17:39:33,650 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:33,650 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 21 [2021-03-25 17:39:33,650 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:33,666 INFO L129 PetriNetUnfolder]: 17/38 cut-off events. [2021-03-25 17:39:33,666 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,667 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. [2021-03-25 17:39:33,667 INFO L132 encePairwiseOnDemand]: 19/21 looper letters, 4 selfloop transitions, 1 changer transitions 0/10 dead transitions. [2021-03-25 17:39:33,668 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 10 transitions, 62 flow [2021-03-25 17:39:33,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:33,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:33,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 36 transitions. [2021-03-25 17:39:33,669 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5714285714285714 [2021-03-25 17:39:33,669 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 36 transitions. [2021-03-25 17:39:33,669 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 36 transitions. [2021-03-25 17:39:33,670 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:33,670 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 36 transitions. [2021-03-25 17:39:33,670 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) [2021-03-25 17:39:33,671 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) [2021-03-25 17:39:33,671 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) [2021-03-25 17:39:33,671 INFO L185 Difference]: Start difference. First operand has 20 places, 11 transitions, 54 flow. Second operand 3 states and 36 transitions. [2021-03-25 17:39:33,671 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 10 transitions, 62 flow [2021-03-25 17:39:33,672 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 10 transitions, 50 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:33,672 INFO L241 Difference]: Finished difference. Result has 21 places, 10 transitions, 42 flow [2021-03-25 17:39:33,673 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} [2021-03-25 17:39:33,673 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 1 predicate places. [2021-03-25 17:39:33,673 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,673 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 21 places, 10 transitions, 42 flow [2021-03-25 17:39:33,673 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 21 places, 10 transitions, 42 flow [2021-03-25 17:39:33,674 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 10 transitions, 42 flow [2021-03-25 17:39:33,676 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-03-25 17:39:33,676 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,676 INFO L84 FinitePrefix]: Finished finitePrefix Result has 29 conditions, 10 events. 0/10 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 8 event pairs, 0 based on Foata normal form. 0/10 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-25 17:39:33,676 INFO L142 LiptonReduction]: Number of co-enabled transitions 32 [2021-03-25 17:39:33,677 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:33,677 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:33,677 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-25 17:39:33,678 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 10 transitions, 42 flow [2021-03-25 17:39:33,678 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) [2021-03-25 17:39:33,678 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,678 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-25 17:39:33,679 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-25 17:39:33,679 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1646739026, now seen corresponding path program 1 times [2021-03-25 17:39:33,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972161575] [2021-03-25 17:39:33,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,683 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,686 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,687 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:33,687 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:33,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-25 17:39:33,687 WARN L342 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:33,688 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-03-25 17:39:33,695 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:33,695 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:33,696 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:33,697 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:33,697 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:33,697 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:33,697 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:33,697 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:33,697 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:33,697 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:33,698 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 20 transitions, 85 flow [2021-03-25 17:39:33,703 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-25 17:39:33,703 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,703 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. [2021-03-25 17:39:33,703 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 20 transitions, 85 flow [2021-03-25 17:39:33,704 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 18 transitions, 81 flow [2021-03-25 17:39:33,704 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,704 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-25 17:39:33,704 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-25 17:39:33,705 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 18 transitions, 81 flow [2021-03-25 17:39:33,708 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-25 17:39:33,708 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,708 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. [2021-03-25 17:39:33,708 INFO L142 LiptonReduction]: Number of co-enabled transitions 160 [2021-03-25 17:39:33,794 INFO L154 LiptonReduction]: Checked pairs total: 60 [2021-03-25 17:39:33,794 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-25 17:39:33,795 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 91 [2021-03-25 17:39:33,796 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 17:39:33,797 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,797 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,797 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:33,797 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,797 INFO L82 PathProgramCache]: Analyzing trace with hash 3619, now seen corresponding path program 1 times [2021-03-25 17:39:33,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,798 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641205405] [2021-03-25 17:39:33,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:33,803 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:33,803 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:33,806 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:33,806 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641205405] [2021-03-25 17:39:33,806 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:33,806 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:33,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013199794] [2021-03-25 17:39:33,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:33,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:33,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:33,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:33,807 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-03-25 17:39:33,808 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) [2021-03-25 17:39:33,808 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:33,808 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-03-25 17:39:33,808 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:33,829 INFO L129 PetriNetUnfolder]: 49/87 cut-off events. [2021-03-25 17:39:33,829 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,829 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. [2021-03-25 17:39:33,830 INFO L132 encePairwiseOnDemand]: 23/25 looper letters, 5 selfloop transitions, 1 changer transitions 0/12 dead transitions. [2021-03-25 17:39:33,830 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 12 transitions, 81 flow [2021-03-25 17:39:33,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:33,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:33,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 43 transitions. [2021-03-25 17:39:33,831 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5733333333333334 [2021-03-25 17:39:33,831 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 43 transitions. [2021-03-25 17:39:33,832 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 43 transitions. [2021-03-25 17:39:33,832 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:33,832 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 43 transitions. [2021-03-25 17:39:33,832 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) [2021-03-25 17:39:33,833 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) [2021-03-25 17:39:33,833 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) [2021-03-25 17:39:33,833 INFO L185 Difference]: Start difference. First operand has 24 places, 13 transitions, 71 flow. Second operand 3 states and 43 transitions. [2021-03-25 17:39:33,833 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 12 transitions, 81 flow [2021-03-25 17:39:33,834 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 12 transitions, 61 flow, removed 10 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:33,835 INFO L241 Difference]: Finished difference. Result has 25 places, 12 transitions, 51 flow [2021-03-25 17:39:33,835 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} [2021-03-25 17:39:33,835 INFO L343 CegarLoopForPetriNet]: 24 programPoint places, 1 predicate places. [2021-03-25 17:39:33,835 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,835 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 25 places, 12 transitions, 51 flow [2021-03-25 17:39:33,835 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 25 places, 12 transitions, 51 flow [2021-03-25 17:39:33,836 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 25 places, 12 transitions, 51 flow [2021-03-25 17:39:33,837 INFO L129 PetriNetUnfolder]: 0/12 cut-off events. [2021-03-25 17:39:33,837 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,837 INFO L84 FinitePrefix]: Finished finitePrefix Result has 35 conditions, 12 events. 0/12 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 9 event pairs, 0 based on Foata normal form. 0/12 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-25 17:39:33,838 INFO L142 LiptonReduction]: Number of co-enabled transitions 50 [2021-03-25 17:39:33,838 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:33,838 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:33,838 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 3 [2021-03-25 17:39:33,839 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 12 transitions, 51 flow [2021-03-25 17:39:33,839 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) [2021-03-25 17:39:33,839 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,839 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:33,839 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-25 17:39:33,839 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1085119695, now seen corresponding path program 1 times [2021-03-25 17:39:33,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,840 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952942499] [2021-03-25 17:39:33,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,844 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:33,846 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:33,848 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:33,848 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:33,848 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-25 17:39:33,848 WARN L342 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:33,848 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-03-25 17:39:33,857 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:33,858 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:33,858 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:33,859 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:33,859 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:33,859 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:33,859 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:33,859 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:33,859 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:33,859 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:33,860 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 36 places, 23 transitions, 106 flow [2021-03-25 17:39:33,863 INFO L129 PetriNetUnfolder]: 0/41 cut-off events. [2021-03-25 17:39:33,864 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,864 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. [2021-03-25 17:39:33,864 INFO L82 GeneralOperation]: Start removeDead. Operand has 36 places, 23 transitions, 106 flow [2021-03-25 17:39:33,864 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 21 transitions, 102 flow [2021-03-25 17:39:33,865 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:33,865 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-25 17:39:33,865 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-25 17:39:33,865 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 21 transitions, 102 flow [2021-03-25 17:39:33,868 INFO L129 PetriNetUnfolder]: 0/27 cut-off events. [2021-03-25 17:39:33,868 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,868 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. [2021-03-25 17:39:33,869 INFO L142 LiptonReduction]: Number of co-enabled transitions 228 [2021-03-25 17:39:33,984 INFO L154 LiptonReduction]: Checked pairs total: 87 [2021-03-25 17:39:33,984 INFO L156 LiptonReduction]: Total number of compositions: 6 [2021-03-25 17:39:33,984 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 120 [2021-03-25 17:39:33,985 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:39:33,985 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:33,985 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:33,985 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:33,985 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:33,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:33,986 INFO L82 PathProgramCache]: Analyzing trace with hash 4515, now seen corresponding path program 1 times [2021-03-25 17:39:33,986 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:33,986 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524716564] [2021-03-25 17:39:33,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:33,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:33,991 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:33,991 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:33,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:33,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524716564] [2021-03-25 17:39:33,994 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:33,994 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:33,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100539316] [2021-03-25 17:39:33,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:33,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:33,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:33,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:33,995 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 29 [2021-03-25 17:39:33,995 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) [2021-03-25 17:39:33,995 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:33,995 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 29 [2021-03-25 17:39:33,995 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:34,022 INFO L129 PetriNetUnfolder]: 129/200 cut-off events. [2021-03-25 17:39:34,023 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,023 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. [2021-03-25 17:39:34,025 INFO L132 encePairwiseOnDemand]: 27/29 looper letters, 6 selfloop transitions, 1 changer transitions 0/14 dead transitions. [2021-03-25 17:39:34,025 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 14 transitions, 102 flow [2021-03-25 17:39:34,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:34,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:34,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 50 transitions. [2021-03-25 17:39:34,026 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5747126436781609 [2021-03-25 17:39:34,026 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 50 transitions. [2021-03-25 17:39:34,026 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 50 transitions. [2021-03-25 17:39:34,027 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:34,027 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 50 transitions. [2021-03-25 17:39:34,027 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) [2021-03-25 17:39:34,028 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) [2021-03-25 17:39:34,028 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) [2021-03-25 17:39:34,028 INFO L185 Difference]: Start difference. First operand has 28 places, 15 transitions, 90 flow. Second operand 3 states and 50 transitions. [2021-03-25 17:39:34,028 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 14 transitions, 102 flow [2021-03-25 17:39:34,029 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 14 transitions, 72 flow, removed 15 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:34,030 INFO L241 Difference]: Finished difference. Result has 29 places, 14 transitions, 60 flow [2021-03-25 17:39:34,030 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} [2021-03-25 17:39:34,030 INFO L343 CegarLoopForPetriNet]: 28 programPoint places, 1 predicate places. [2021-03-25 17:39:34,030 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:34,030 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 14 transitions, 60 flow [2021-03-25 17:39:34,030 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 14 transitions, 60 flow [2021-03-25 17:39:34,031 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 14 transitions, 60 flow [2021-03-25 17:39:34,032 INFO L129 PetriNetUnfolder]: 0/14 cut-off events. [2021-03-25 17:39:34,032 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,032 INFO L84 FinitePrefix]: Finished finitePrefix Result has 41 conditions, 14 events. 0/14 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 6 event pairs, 0 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-25 17:39:34,033 INFO L142 LiptonReduction]: Number of co-enabled transitions 72 [2021-03-25 17:39:34,033 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:34,034 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:34,034 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-25 17:39:34,034 INFO L480 AbstractCegarLoop]: Abstraction has has 29 places, 14 transitions, 60 flow [2021-03-25 17:39:34,034 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) [2021-03-25 17:39:34,034 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:34,034 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:34,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-25 17:39:34,035 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:34,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:34,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1719135375, now seen corresponding path program 1 times [2021-03-25 17:39:34,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:34,035 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904752425] [2021-03-25 17:39:34,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:34,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:34,039 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:34,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:34,041 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:34,043 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:34,043 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:34,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-03-25 17:39:34,043 WARN L342 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:34,043 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-03-25 17:39:34,052 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:34,052 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:34,053 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:34,053 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:34,053 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:34,053 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:34,053 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:34,053 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:34,053 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:34,053 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:34,054 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 26 transitions, 129 flow [2021-03-25 17:39:34,057 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-25 17:39:34,057 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,058 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. [2021-03-25 17:39:34,058 INFO L82 GeneralOperation]: Start removeDead. Operand has 41 places, 26 transitions, 129 flow [2021-03-25 17:39:34,058 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 39 places, 24 transitions, 125 flow [2021-03-25 17:39:34,058 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:34,058 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-25 17:39:34,059 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-25 17:39:34,059 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 39 places, 24 transitions, 125 flow [2021-03-25 17:39:34,061 INFO L129 PetriNetUnfolder]: 0/31 cut-off events. [2021-03-25 17:39:34,061 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,062 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. [2021-03-25 17:39:34,062 INFO L142 LiptonReduction]: Number of co-enabled transitions 308 [2021-03-25 17:39:34,194 INFO L154 LiptonReduction]: Checked pairs total: 119 [2021-03-25 17:39:34,194 INFO L156 LiptonReduction]: Total number of compositions: 7 [2021-03-25 17:39:34,195 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 137 [2021-03-25 17:39:34,197 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:39:34,197 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,197 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:34,197 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:34,197 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:34,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:34,197 INFO L82 PathProgramCache]: Analyzing trace with hash 5539, now seen corresponding path program 1 times [2021-03-25 17:39:34,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:34,198 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045403135] [2021-03-25 17:39:34,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:34,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:34,207 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:34,207 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:34,210 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:34,210 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045403135] [2021-03-25 17:39:34,210 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:34,210 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:34,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193290241] [2021-03-25 17:39:34,210 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:34,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:34,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:34,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:34,211 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 33 [2021-03-25 17:39:34,212 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) [2021-03-25 17:39:34,212 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:34,212 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 33 [2021-03-25 17:39:34,212 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:34,269 INFO L129 PetriNetUnfolder]: 321/457 cut-off events. [2021-03-25 17:39:34,270 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,273 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. [2021-03-25 17:39:34,276 INFO L132 encePairwiseOnDemand]: 31/33 looper letters, 7 selfloop transitions, 1 changer transitions 0/16 dead transitions. [2021-03-25 17:39:34,276 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 16 transitions, 125 flow [2021-03-25 17:39:34,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:34,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:34,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 57 transitions. [2021-03-25 17:39:34,279 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5757575757575758 [2021-03-25 17:39:34,279 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 57 transitions. [2021-03-25 17:39:34,279 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 57 transitions. [2021-03-25 17:39:34,279 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:34,279 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 57 transitions. [2021-03-25 17:39:34,281 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) [2021-03-25 17:39:34,281 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) [2021-03-25 17:39:34,281 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) [2021-03-25 17:39:34,282 INFO L185 Difference]: Start difference. First operand has 32 places, 17 transitions, 111 flow. Second operand 3 states and 57 transitions. [2021-03-25 17:39:34,282 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 16 transitions, 125 flow [2021-03-25 17:39:34,284 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 16 transitions, 83 flow, removed 21 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:34,284 INFO L241 Difference]: Finished difference. Result has 33 places, 16 transitions, 69 flow [2021-03-25 17:39:34,284 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} [2021-03-25 17:39:34,285 INFO L343 CegarLoopForPetriNet]: 32 programPoint places, 1 predicate places. [2021-03-25 17:39:34,285 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:34,285 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 33 places, 16 transitions, 69 flow [2021-03-25 17:39:34,285 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 33 places, 16 transitions, 69 flow [2021-03-25 17:39:34,285 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 33 places, 16 transitions, 69 flow [2021-03-25 17:39:34,288 INFO L129 PetriNetUnfolder]: 0/16 cut-off events. [2021-03-25 17:39:34,288 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,288 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47 conditions, 16 events. 0/16 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 19 event pairs, 0 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-25 17:39:34,288 INFO L142 LiptonReduction]: Number of co-enabled transitions 98 [2021-03-25 17:39:34,290 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:34,290 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:34,290 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 17:39:34,290 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 16 transitions, 69 flow [2021-03-25 17:39:34,290 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) [2021-03-25 17:39:34,291 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:34,291 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:34,291 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-03-25 17:39:34,291 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:34,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:34,291 INFO L82 PathProgramCache]: Analyzing trace with hash 779611434, now seen corresponding path program 1 times [2021-03-25 17:39:34,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:34,292 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186648261] [2021-03-25 17:39:34,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:34,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:34,303 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:34,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:34,317 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:34,320 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:34,320 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:34,320 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-03-25 17:39:34,321 WARN L342 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:34,321 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2021-03-25 17:39:34,333 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:34,333 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:34,334 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:34,335 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:34,335 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:34,335 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:34,335 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:34,335 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:34,335 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:34,335 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:34,337 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 29 transitions, 154 flow [2021-03-25 17:39:34,344 INFO L129 PetriNetUnfolder]: 0/53 cut-off events. [2021-03-25 17:39:34,344 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,344 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. [2021-03-25 17:39:34,344 INFO L82 GeneralOperation]: Start removeDead. Operand has 46 places, 29 transitions, 154 flow [2021-03-25 17:39:34,345 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 44 places, 27 transitions, 150 flow [2021-03-25 17:39:34,345 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:34,345 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-25 17:39:34,345 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-25 17:39:34,346 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 44 places, 27 transitions, 150 flow [2021-03-25 17:39:34,349 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-25 17:39:34,353 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,354 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. [2021-03-25 17:39:34,360 INFO L142 LiptonReduction]: Number of co-enabled transitions 400 [2021-03-25 17:39:34,527 INFO L154 LiptonReduction]: Checked pairs total: 156 [2021-03-25 17:39:34,529 INFO L156 LiptonReduction]: Total number of compositions: 8 [2021-03-25 17:39:34,529 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 184 [2021-03-25 17:39:34,530 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:39:34,530 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,531 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:34,531 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:34,531 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:34,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:34,531 INFO L82 PathProgramCache]: Analyzing trace with hash 6691, now seen corresponding path program 1 times [2021-03-25 17:39:34,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:34,531 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751856833] [2021-03-25 17:39:34,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:34,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:34,554 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:34,554 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:34,556 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:34,556 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751856833] [2021-03-25 17:39:34,556 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:34,556 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:34,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615695603] [2021-03-25 17:39:34,557 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:34,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:34,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:34,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:34,557 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 37 [2021-03-25 17:39:34,575 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) [2021-03-25 17:39:34,575 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:34,576 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 37 [2021-03-25 17:39:34,576 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:34,694 INFO L129 PetriNetUnfolder]: 769/1034 cut-off events. [2021-03-25 17:39:34,694 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,698 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. [2021-03-25 17:39:34,704 INFO L132 encePairwiseOnDemand]: 35/37 looper letters, 8 selfloop transitions, 1 changer transitions 0/18 dead transitions. [2021-03-25 17:39:34,704 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 18 transitions, 150 flow [2021-03-25 17:39:34,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:34,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:34,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 64 transitions. [2021-03-25 17:39:34,707 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5765765765765766 [2021-03-25 17:39:34,707 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 64 transitions. [2021-03-25 17:39:34,707 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 64 transitions. [2021-03-25 17:39:34,707 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:34,707 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 64 transitions. [2021-03-25 17:39:34,708 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) [2021-03-25 17:39:34,709 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) [2021-03-25 17:39:34,709 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) [2021-03-25 17:39:34,709 INFO L185 Difference]: Start difference. First operand has 36 places, 19 transitions, 134 flow. Second operand 3 states and 64 transitions. [2021-03-25 17:39:34,709 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 18 transitions, 150 flow [2021-03-25 17:39:34,711 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 18 transitions, 94 flow, removed 28 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:34,711 INFO L241 Difference]: Finished difference. Result has 37 places, 18 transitions, 78 flow [2021-03-25 17:39:34,712 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} [2021-03-25 17:39:34,712 INFO L343 CegarLoopForPetriNet]: 36 programPoint places, 1 predicate places. [2021-03-25 17:39:34,712 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:34,712 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 37 places, 18 transitions, 78 flow [2021-03-25 17:39:34,712 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 37 places, 18 transitions, 78 flow [2021-03-25 17:39:34,713 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 37 places, 18 transitions, 78 flow [2021-03-25 17:39:34,715 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-25 17:39:34,716 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,716 INFO L84 FinitePrefix]: Finished finitePrefix Result has 53 conditions, 18 events. 0/18 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 20 event pairs, 0 based on Foata normal form. 0/18 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-25 17:39:34,716 INFO L142 LiptonReduction]: Number of co-enabled transitions 128 [2021-03-25 17:39:34,717 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:34,717 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:34,717 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 17:39:34,719 INFO L480 AbstractCegarLoop]: Abstraction has has 37 places, 18 transitions, 78 flow [2021-03-25 17:39:34,719 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) [2021-03-25 17:39:34,719 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:34,720 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:34,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-03-25 17:39:34,720 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:34,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:34,720 INFO L82 PathProgramCache]: Analyzing trace with hash -2053304524, now seen corresponding path program 1 times [2021-03-25 17:39:34,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:34,720 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681227420] [2021-03-25 17:39:34,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:34,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:34,723 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:34,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:34,733 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:34,735 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:34,736 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:34,737 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-03-25 17:39:34,737 WARN L342 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:34,737 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2021-03-25 17:39:34,751 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:34,751 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:34,752 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:34,752 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:34,752 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:34,752 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:34,752 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:34,752 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:34,752 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:34,752 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:34,754 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 51 places, 32 transitions, 181 flow [2021-03-25 17:39:34,758 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-25 17:39:34,758 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,758 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. [2021-03-25 17:39:34,758 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 32 transitions, 181 flow [2021-03-25 17:39:34,758 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 30 transitions, 177 flow [2021-03-25 17:39:34,759 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:34,759 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-25 17:39:34,759 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-25 17:39:34,760 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 30 transitions, 177 flow [2021-03-25 17:39:34,765 INFO L129 PetriNetUnfolder]: 0/39 cut-off events. [2021-03-25 17:39:34,765 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,765 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. [2021-03-25 17:39:34,765 INFO L142 LiptonReduction]: Number of co-enabled transitions 504 [2021-03-25 17:39:34,984 INFO L154 LiptonReduction]: Checked pairs total: 198 [2021-03-25 17:39:34,984 INFO L156 LiptonReduction]: Total number of compositions: 9 [2021-03-25 17:39:34,984 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 225 [2021-03-25 17:39:34,985 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 17:39:34,985 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:34,985 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:34,985 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:34,985 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:34,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:34,985 INFO L82 PathProgramCache]: Analyzing trace with hash 7971, now seen corresponding path program 1 times [2021-03-25 17:39:34,986 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:34,986 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279615422] [2021-03-25 17:39:34,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:34,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:34,990 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:34,991 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:34,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:34,993 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279615422] [2021-03-25 17:39:34,993 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:34,993 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:34,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52911040] [2021-03-25 17:39:34,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:34,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:34,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:34,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:34,995 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 41 [2021-03-25 17:39:34,995 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) [2021-03-25 17:39:34,995 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:34,995 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 41 [2021-03-25 17:39:34,996 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:35,207 INFO L129 PetriNetUnfolder]: 1793/2315 cut-off events. [2021-03-25 17:39:35,207 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:35,215 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. [2021-03-25 17:39:35,229 INFO L132 encePairwiseOnDemand]: 39/41 looper letters, 9 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2021-03-25 17:39:35,230 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 20 transitions, 177 flow [2021-03-25 17:39:35,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:35,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:35,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 71 transitions. [2021-03-25 17:39:35,231 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5772357723577236 [2021-03-25 17:39:35,231 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 71 transitions. [2021-03-25 17:39:35,231 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 71 transitions. [2021-03-25 17:39:35,231 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:35,231 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 71 transitions. [2021-03-25 17:39:35,231 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) [2021-03-25 17:39:35,232 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) [2021-03-25 17:39:35,232 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) [2021-03-25 17:39:35,232 INFO L185 Difference]: Start difference. First operand has 40 places, 21 transitions, 159 flow. Second operand 3 states and 71 transitions. [2021-03-25 17:39:35,232 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 20 transitions, 177 flow [2021-03-25 17:39:35,233 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 20 transitions, 105 flow, removed 36 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:35,234 INFO L241 Difference]: Finished difference. Result has 41 places, 20 transitions, 87 flow [2021-03-25 17:39:35,234 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} [2021-03-25 17:39:35,234 INFO L343 CegarLoopForPetriNet]: 40 programPoint places, 1 predicate places. [2021-03-25 17:39:35,234 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:35,234 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 41 places, 20 transitions, 87 flow [2021-03-25 17:39:35,234 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 41 places, 20 transitions, 87 flow [2021-03-25 17:39:35,235 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 20 transitions, 87 flow [2021-03-25 17:39:35,236 INFO L129 PetriNetUnfolder]: 0/20 cut-off events. [2021-03-25 17:39:35,236 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:35,237 INFO L84 FinitePrefix]: Finished finitePrefix Result has 59 conditions, 20 events. 0/20 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 15 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-25 17:39:35,237 INFO L142 LiptonReduction]: Number of co-enabled transitions 162 [2021-03-25 17:39:35,238 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:35,238 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:35,238 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-25 17:39:35,238 INFO L480 AbstractCegarLoop]: Abstraction has has 41 places, 20 transitions, 87 flow [2021-03-25 17:39:35,238 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) [2021-03-25 17:39:35,238 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:35,239 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:35,239 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-03-25 17:39:35,239 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:35,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:35,239 INFO L82 PathProgramCache]: Analyzing trace with hash -607272555, now seen corresponding path program 1 times [2021-03-25 17:39:35,239 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:35,239 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177696041] [2021-03-25 17:39:35,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:35,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:35,242 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:35,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:35,245 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:35,246 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:35,246 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:35,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-03-25 17:39:35,246 WARN L342 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:35,247 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2021-03-25 17:39:35,258 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:35,259 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:35,259 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:35,259 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:35,259 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:35,259 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:35,259 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:35,259 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:35,259 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:35,260 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:35,260 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 56 places, 35 transitions, 210 flow [2021-03-25 17:39:35,264 INFO L129 PetriNetUnfolder]: 0/65 cut-off events. [2021-03-25 17:39:35,264 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:35,264 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. [2021-03-25 17:39:35,264 INFO L82 GeneralOperation]: Start removeDead. Operand has 56 places, 35 transitions, 210 flow [2021-03-25 17:39:35,265 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 54 places, 33 transitions, 206 flow [2021-03-25 17:39:35,265 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:35,265 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-25 17:39:35,265 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-25 17:39:35,265 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 54 places, 33 transitions, 206 flow [2021-03-25 17:39:35,268 INFO L129 PetriNetUnfolder]: 0/43 cut-off events. [2021-03-25 17:39:35,268 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:35,268 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. [2021-03-25 17:39:35,269 INFO L142 LiptonReduction]: Number of co-enabled transitions 620 [2021-03-25 17:39:35,505 INFO L154 LiptonReduction]: Checked pairs total: 245 [2021-03-25 17:39:35,512 INFO L156 LiptonReduction]: Total number of compositions: 10 [2021-03-25 17:39:35,512 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 247 [2021-03-25 17:39:35,513 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:39:35,513 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:35,513 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:35,513 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:35,513 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:35,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:35,514 INFO L82 PathProgramCache]: Analyzing trace with hash 9379, now seen corresponding path program 1 times [2021-03-25 17:39:35,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:35,514 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [63349637] [2021-03-25 17:39:35,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:35,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:35,518 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:35,519 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:35,521 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:35,521 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [63349637] [2021-03-25 17:39:35,522 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:35,522 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:35,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687348240] [2021-03-25 17:39:35,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:35,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:35,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:35,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:35,523 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 45 [2021-03-25 17:39:35,523 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) [2021-03-25 17:39:35,523 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:35,523 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 45 [2021-03-25 17:39:35,523 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:35,916 INFO L129 PetriNetUnfolder]: 4097/5132 cut-off events. [2021-03-25 17:39:35,916 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:35,939 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. [2021-03-25 17:39:35,973 INFO L132 encePairwiseOnDemand]: 43/45 looper letters, 10 selfloop transitions, 1 changer transitions 0/22 dead transitions. [2021-03-25 17:39:35,973 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 22 transitions, 206 flow [2021-03-25 17:39:35,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:35,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:35,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 78 transitions. [2021-03-25 17:39:35,974 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5777777777777777 [2021-03-25 17:39:35,974 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 78 transitions. [2021-03-25 17:39:35,974 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 78 transitions. [2021-03-25 17:39:35,975 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:35,975 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 78 transitions. [2021-03-25 17:39:35,975 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) [2021-03-25 17:39:35,975 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) [2021-03-25 17:39:35,975 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) [2021-03-25 17:39:35,976 INFO L185 Difference]: Start difference. First operand has 44 places, 23 transitions, 186 flow. Second operand 3 states and 78 transitions. [2021-03-25 17:39:35,976 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 22 transitions, 206 flow [2021-03-25 17:39:35,977 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 22 transitions, 116 flow, removed 45 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:35,977 INFO L241 Difference]: Finished difference. Result has 45 places, 22 transitions, 96 flow [2021-03-25 17:39:35,977 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} [2021-03-25 17:39:35,978 INFO L343 CegarLoopForPetriNet]: 44 programPoint places, 1 predicate places. [2021-03-25 17:39:35,978 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:35,978 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 45 places, 22 transitions, 96 flow [2021-03-25 17:39:35,978 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 45 places, 22 transitions, 96 flow [2021-03-25 17:39:35,978 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 45 places, 22 transitions, 96 flow [2021-03-25 17:39:35,987 INFO L129 PetriNetUnfolder]: 0/22 cut-off events. [2021-03-25 17:39:35,988 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:35,988 INFO L84 FinitePrefix]: Finished finitePrefix Result has 65 conditions, 22 events. 0/22 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 20 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-25 17:39:35,988 INFO L142 LiptonReduction]: Number of co-enabled transitions 200 [2021-03-25 17:39:35,989 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:35,989 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:35,989 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 11 [2021-03-25 17:39:35,990 INFO L480 AbstractCegarLoop]: Abstraction has has 45 places, 22 transitions, 96 flow [2021-03-25 17:39:35,990 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) [2021-03-25 17:39:35,990 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:35,990 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:35,990 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-03-25 17:39:35,990 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:35,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:35,990 INFO L82 PathProgramCache]: Analyzing trace with hash -1208304905, now seen corresponding path program 1 times [2021-03-25 17:39:35,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:35,991 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52525082] [2021-03-25 17:39:35,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:35,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:35,994 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:35,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:35,996 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:35,997 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:35,997 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:35,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-03-25 17:39:35,997 WARN L342 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:35,998 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2021-03-25 17:39:36,014 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:36,014 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:36,015 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:36,015 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:36,015 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:36,015 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:36,015 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:36,015 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:36,015 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:36,015 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:36,016 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 38 transitions, 241 flow [2021-03-25 17:39:36,020 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-25 17:39:36,020 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:36,020 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. [2021-03-25 17:39:36,020 INFO L82 GeneralOperation]: Start removeDead. Operand has 61 places, 38 transitions, 241 flow [2021-03-25 17:39:36,021 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 36 transitions, 237 flow [2021-03-25 17:39:36,021 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:36,021 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-25 17:39:36,021 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-25 17:39:36,021 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 59 places, 36 transitions, 237 flow [2021-03-25 17:39:36,024 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-25 17:39:36,024 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:36,025 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. [2021-03-25 17:39:36,025 INFO L142 LiptonReduction]: Number of co-enabled transitions 748 [2021-03-25 17:39:36,311 INFO L154 LiptonReduction]: Checked pairs total: 297 [2021-03-25 17:39:36,312 INFO L156 LiptonReduction]: Total number of compositions: 11 [2021-03-25 17:39:36,312 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 291 [2021-03-25 17:39:36,313 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 17:39:36,313 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:36,313 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:36,314 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:36,314 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:36,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:36,314 INFO L82 PathProgramCache]: Analyzing trace with hash 10915, now seen corresponding path program 1 times [2021-03-25 17:39:36,314 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:36,314 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232239966] [2021-03-25 17:39:36,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:36,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:36,324 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:36,324 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:36,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:36,327 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232239966] [2021-03-25 17:39:36,327 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:36,327 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:36,327 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104393836] [2021-03-25 17:39:36,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:36,328 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:36,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:36,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:36,328 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 49 [2021-03-25 17:39:36,329 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) [2021-03-25 17:39:36,329 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:36,329 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 49 [2021-03-25 17:39:36,329 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:37,434 INFO L129 PetriNetUnfolder]: 9217/11277 cut-off events. [2021-03-25 17:39:37,434 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:37,476 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. [2021-03-25 17:39:37,571 INFO L132 encePairwiseOnDemand]: 47/49 looper letters, 11 selfloop transitions, 1 changer transitions 0/24 dead transitions. [2021-03-25 17:39:37,571 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 24 transitions, 237 flow [2021-03-25 17:39:37,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:37,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:37,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 85 transitions. [2021-03-25 17:39:37,573 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5782312925170068 [2021-03-25 17:39:37,573 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 85 transitions. [2021-03-25 17:39:37,573 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 85 transitions. [2021-03-25 17:39:37,573 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:37,573 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 85 transitions. [2021-03-25 17:39:37,574 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) [2021-03-25 17:39:37,575 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) [2021-03-25 17:39:37,575 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) [2021-03-25 17:39:37,575 INFO L185 Difference]: Start difference. First operand has 48 places, 25 transitions, 215 flow. Second operand 3 states and 85 transitions. [2021-03-25 17:39:37,575 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 24 transitions, 237 flow [2021-03-25 17:39:37,576 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 24 transitions, 127 flow, removed 55 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:37,577 INFO L241 Difference]: Finished difference. Result has 49 places, 24 transitions, 105 flow [2021-03-25 17:39:37,577 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} [2021-03-25 17:39:37,578 INFO L343 CegarLoopForPetriNet]: 48 programPoint places, 1 predicate places. [2021-03-25 17:39:37,578 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:37,578 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 24 transitions, 105 flow [2021-03-25 17:39:37,578 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 24 transitions, 105 flow [2021-03-25 17:39:37,578 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 24 transitions, 105 flow [2021-03-25 17:39:37,580 INFO L129 PetriNetUnfolder]: 0/24 cut-off events. [2021-03-25 17:39:37,580 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:37,580 INFO L84 FinitePrefix]: Finished finitePrefix Result has 71 conditions, 24 events. 0/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 21 event pairs, 0 based on Foata normal form. 0/24 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-25 17:39:37,580 INFO L142 LiptonReduction]: Number of co-enabled transitions 242 [2021-03-25 17:39:37,582 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:37,582 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:37,582 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-25 17:39:37,582 INFO L480 AbstractCegarLoop]: Abstraction has has 49 places, 24 transitions, 105 flow [2021-03-25 17:39:37,582 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) [2021-03-25 17:39:37,582 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:37,583 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:37,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-03-25 17:39:37,583 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:37,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:37,583 INFO L82 PathProgramCache]: Analyzing trace with hash 941462544, now seen corresponding path program 1 times [2021-03-25 17:39:37,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:37,583 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476658133] [2021-03-25 17:39:37,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:37,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:37,590 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:37,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:37,602 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:37,606 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:37,606 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:37,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-03-25 17:39:37,606 WARN L342 ceAbstractionStarter]: 11 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:37,606 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 12 thread instances. [2021-03-25 17:39:37,622 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:37,622 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:37,622 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:37,623 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:37,623 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:37,623 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:37,623 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:37,623 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:37,623 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:37,623 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:37,623 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 66 places, 41 transitions, 274 flow [2021-03-25 17:39:37,628 INFO L129 PetriNetUnfolder]: 0/77 cut-off events. [2021-03-25 17:39:37,628 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:37,629 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. [2021-03-25 17:39:37,629 INFO L82 GeneralOperation]: Start removeDead. Operand has 66 places, 41 transitions, 274 flow [2021-03-25 17:39:37,630 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 39 transitions, 270 flow [2021-03-25 17:39:37,630 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:37,630 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-25 17:39:37,630 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-25 17:39:37,631 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 64 places, 39 transitions, 270 flow [2021-03-25 17:39:37,633 INFO L129 PetriNetUnfolder]: 0/51 cut-off events. [2021-03-25 17:39:37,633 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:37,634 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. [2021-03-25 17:39:37,634 INFO L142 LiptonReduction]: Number of co-enabled transitions 888 [2021-03-25 17:39:37,996 INFO L154 LiptonReduction]: Checked pairs total: 354 [2021-03-25 17:39:37,996 INFO L156 LiptonReduction]: Total number of compositions: 12 [2021-03-25 17:39:37,997 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 367 [2021-03-25 17:39:37,997 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 17:39:37,998 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:37,998 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:37,998 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:37,998 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:37,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:37,998 INFO L82 PathProgramCache]: Analyzing trace with hash 12579, now seen corresponding path program 1 times [2021-03-25 17:39:37,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:37,998 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1501637842] [2021-03-25 17:39:37,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:38,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:38,003 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:38,004 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:38,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:38,006 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1501637842] [2021-03-25 17:39:38,006 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:38,006 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:38,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943593595] [2021-03-25 17:39:38,006 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:38,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:38,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:38,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:38,007 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 53 [2021-03-25 17:39:38,007 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) [2021-03-25 17:39:38,007 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:38,008 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 53 [2021-03-25 17:39:38,008 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:40,166 INFO L129 PetriNetUnfolder]: 20481/24590 cut-off events. [2021-03-25 17:39:40,166 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:40,400 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. [2021-03-25 17:39:40,515 INFO L132 encePairwiseOnDemand]: 51/53 looper letters, 12 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2021-03-25 17:39:40,515 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 26 transitions, 270 flow [2021-03-25 17:39:40,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:40,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:40,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 92 transitions. [2021-03-25 17:39:40,516 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5786163522012578 [2021-03-25 17:39:40,516 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 92 transitions. [2021-03-25 17:39:40,516 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 92 transitions. [2021-03-25 17:39:40,517 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:40,517 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 92 transitions. [2021-03-25 17:39:40,517 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) [2021-03-25 17:39:40,518 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) [2021-03-25 17:39:40,518 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) [2021-03-25 17:39:40,518 INFO L185 Difference]: Start difference. First operand has 52 places, 27 transitions, 246 flow. Second operand 3 states and 92 transitions. [2021-03-25 17:39:40,518 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 26 transitions, 270 flow [2021-03-25 17:39:40,520 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 53 places, 26 transitions, 138 flow, removed 66 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:40,521 INFO L241 Difference]: Finished difference. Result has 53 places, 26 transitions, 114 flow [2021-03-25 17:39:40,521 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} [2021-03-25 17:39:40,521 INFO L343 CegarLoopForPetriNet]: 52 programPoint places, 1 predicate places. [2021-03-25 17:39:40,521 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:40,522 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 53 places, 26 transitions, 114 flow [2021-03-25 17:39:40,522 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 53 places, 26 transitions, 114 flow [2021-03-25 17:39:40,522 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 53 places, 26 transitions, 114 flow [2021-03-25 17:39:40,525 INFO L129 PetriNetUnfolder]: 0/26 cut-off events. [2021-03-25 17:39:40,525 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:40,525 INFO L84 FinitePrefix]: Finished finitePrefix Result has 77 conditions, 26 events. 0/26 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 24 event pairs, 0 based on Foata normal form. 0/26 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-25 17:39:40,526 INFO L142 LiptonReduction]: Number of co-enabled transitions 288 [2021-03-25 17:39:40,527 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:40,527 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:40,527 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-03-25 17:39:40,528 INFO L480 AbstractCegarLoop]: Abstraction has has 53 places, 26 transitions, 114 flow [2021-03-25 17:39:40,528 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) [2021-03-25 17:39:40,528 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:40,528 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:40,528 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-03-25 17:39:40,528 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:40,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:40,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1127292090, now seen corresponding path program 1 times [2021-03-25 17:39:40,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:40,529 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551122291] [2021-03-25 17:39:40,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:40,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:40,543 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:40,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:40,545 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:40,547 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:40,547 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:40,547 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-03-25 17:39:40,547 WARN L342 ceAbstractionStarter]: 12 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:40,547 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 13 thread instances. [2021-03-25 17:39:40,567 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:40,567 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:40,568 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:40,568 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:40,568 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:40,569 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:40,569 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:40,569 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:40,569 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:40,569 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:40,569 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 71 places, 44 transitions, 309 flow [2021-03-25 17:39:40,575 INFO L129 PetriNetUnfolder]: 0/83 cut-off events. [2021-03-25 17:39:40,576 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:40,576 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. [2021-03-25 17:39:40,576 INFO L82 GeneralOperation]: Start removeDead. Operand has 71 places, 44 transitions, 309 flow [2021-03-25 17:39:40,576 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 69 places, 42 transitions, 305 flow [2021-03-25 17:39:40,577 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:40,577 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-25 17:39:40,577 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-25 17:39:40,577 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 69 places, 42 transitions, 305 flow [2021-03-25 17:39:40,583 INFO L129 PetriNetUnfolder]: 0/55 cut-off events. [2021-03-25 17:39:40,583 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:40,583 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. [2021-03-25 17:39:40,584 INFO L142 LiptonReduction]: Number of co-enabled transitions 1040 [2021-03-25 17:39:41,048 INFO L154 LiptonReduction]: Checked pairs total: 416 [2021-03-25 17:39:41,049 INFO L156 LiptonReduction]: Total number of compositions: 13 [2021-03-25 17:39:41,049 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 472 [2021-03-25 17:39:41,049 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:39:41,050 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:41,050 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:41,050 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:41,050 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:41,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:41,050 INFO L82 PathProgramCache]: Analyzing trace with hash 14371, now seen corresponding path program 1 times [2021-03-25 17:39:41,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:41,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346999971] [2021-03-25 17:39:41,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:41,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:41,058 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:41,058 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:41,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:41,061 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346999971] [2021-03-25 17:39:41,061 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:41,061 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:41,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721163172] [2021-03-25 17:39:41,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:41,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:41,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:41,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:41,062 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 57 [2021-03-25 17:39:41,062 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) [2021-03-25 17:39:41,062 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:41,062 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 57 [2021-03-25 17:39:41,063 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:45,119 INFO L129 PetriNetUnfolder]: 45057/53263 cut-off events. [2021-03-25 17:39:45,119 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:45,585 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. [2021-03-25 17:39:45,782 INFO L132 encePairwiseOnDemand]: 55/57 looper letters, 13 selfloop transitions, 1 changer transitions 0/28 dead transitions. [2021-03-25 17:39:45,783 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 28 transitions, 305 flow [2021-03-25 17:39:45,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:45,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:45,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2021-03-25 17:39:45,784 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5789473684210527 [2021-03-25 17:39:45,784 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 99 transitions. [2021-03-25 17:39:45,784 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 99 transitions. [2021-03-25 17:39:45,784 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:45,784 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 99 transitions. [2021-03-25 17:39:45,785 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) [2021-03-25 17:39:45,786 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) [2021-03-25 17:39:45,786 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) [2021-03-25 17:39:45,786 INFO L185 Difference]: Start difference. First operand has 56 places, 29 transitions, 279 flow. Second operand 3 states and 99 transitions. [2021-03-25 17:39:45,786 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 28 transitions, 305 flow [2021-03-25 17:39:45,789 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 28 transitions, 149 flow, removed 78 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:45,789 INFO L241 Difference]: Finished difference. Result has 57 places, 28 transitions, 123 flow [2021-03-25 17:39:45,790 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} [2021-03-25 17:39:45,790 INFO L343 CegarLoopForPetriNet]: 56 programPoint places, 1 predicate places. [2021-03-25 17:39:45,790 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:45,790 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 57 places, 28 transitions, 123 flow [2021-03-25 17:39:45,791 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 57 places, 28 transitions, 123 flow [2021-03-25 17:39:45,791 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 57 places, 28 transitions, 123 flow [2021-03-25 17:39:45,794 INFO L129 PetriNetUnfolder]: 0/28 cut-off events. [2021-03-25 17:39:45,794 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:45,794 INFO L84 FinitePrefix]: Finished finitePrefix Result has 83 conditions, 28 events. 0/28 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 23 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-25 17:39:45,794 INFO L142 LiptonReduction]: Number of co-enabled transitions 338 [2021-03-25 17:39:45,796 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:45,796 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:45,796 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-03-25 17:39:45,797 INFO L480 AbstractCegarLoop]: Abstraction has has 57 places, 28 transitions, 123 flow [2021-03-25 17:39:45,797 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) [2021-03-25 17:39:45,797 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:45,797 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:45,797 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-03-25 17:39:45,797 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:45,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:45,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1451810459, now seen corresponding path program 1 times [2021-03-25 17:39:45,798 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:45,798 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903398870] [2021-03-25 17:39:45,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:45,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:45,812 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:45,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:45,814 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:45,816 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:45,816 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:45,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-03-25 17:39:45,816 WARN L342 ceAbstractionStarter]: 13 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:45,817 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 14 thread instances. [2021-03-25 17:39:45,838 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:45,838 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:45,839 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:45,839 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:45,839 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:45,839 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:45,839 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:45,839 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:45,839 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:45,840 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:45,840 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 76 places, 47 transitions, 346 flow [2021-03-25 17:39:45,844 INFO L129 PetriNetUnfolder]: 0/89 cut-off events. [2021-03-25 17:39:45,845 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:45,845 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. [2021-03-25 17:39:45,845 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 47 transitions, 346 flow [2021-03-25 17:39:45,845 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 74 places, 45 transitions, 342 flow [2021-03-25 17:39:45,845 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:45,845 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-25 17:39:45,846 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-25 17:39:45,846 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 74 places, 45 transitions, 342 flow [2021-03-25 17:39:45,849 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-25 17:39:45,849 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:45,849 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. [2021-03-25 17:39:45,850 INFO L142 LiptonReduction]: Number of co-enabled transitions 1204 [2021-03-25 17:39:46,406 INFO L154 LiptonReduction]: Checked pairs total: 483 [2021-03-25 17:39:46,406 INFO L156 LiptonReduction]: Total number of compositions: 14 [2021-03-25 17:39:46,406 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 561 [2021-03-25 17:39:46,408 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 17:39:46,408 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:46,408 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:46,408 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:46,408 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:46,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:46,408 INFO L82 PathProgramCache]: Analyzing trace with hash 16291, now seen corresponding path program 1 times [2021-03-25 17:39:46,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:46,409 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267958329] [2021-03-25 17:39:46,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:46,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:46,414 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:46,415 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:46,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:46,418 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267958329] [2021-03-25 17:39:46,418 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:46,418 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:46,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240926673] [2021-03-25 17:39:46,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:46,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:46,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:46,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:46,419 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 61 [2021-03-25 17:39:46,419 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) [2021-03-25 17:39:46,420 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:46,420 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 61 [2021-03-25 17:39:46,420 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:39:56,595 INFO L129 PetriNetUnfolder]: 98305/114704 cut-off events. [2021-03-25 17:39:56,596 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:57,774 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. [2021-03-25 17:39:58,383 INFO L132 encePairwiseOnDemand]: 59/61 looper letters, 14 selfloop transitions, 1 changer transitions 0/30 dead transitions. [2021-03-25 17:39:58,383 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 30 transitions, 342 flow [2021-03-25 17:39:58,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:39:58,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:39:58,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 106 transitions. [2021-03-25 17:39:58,384 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5792349726775956 [2021-03-25 17:39:58,384 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 106 transitions. [2021-03-25 17:39:58,384 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 106 transitions. [2021-03-25 17:39:58,385 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:39:58,385 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 106 transitions. [2021-03-25 17:39:58,385 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) [2021-03-25 17:39:58,386 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) [2021-03-25 17:39:58,386 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) [2021-03-25 17:39:58,386 INFO L185 Difference]: Start difference. First operand has 60 places, 31 transitions, 314 flow. Second operand 3 states and 106 transitions. [2021-03-25 17:39:58,386 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 30 transitions, 342 flow [2021-03-25 17:39:58,388 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 30 transitions, 160 flow, removed 91 selfloop flow, removed 0 redundant places. [2021-03-25 17:39:58,388 INFO L241 Difference]: Finished difference. Result has 61 places, 30 transitions, 132 flow [2021-03-25 17:39:58,389 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} [2021-03-25 17:39:58,389 INFO L343 CegarLoopForPetriNet]: 60 programPoint places, 1 predicate places. [2021-03-25 17:39:58,389 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:58,389 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 61 places, 30 transitions, 132 flow [2021-03-25 17:39:58,389 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 61 places, 30 transitions, 132 flow [2021-03-25 17:39:58,389 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 30 transitions, 132 flow [2021-03-25 17:39:58,392 INFO L129 PetriNetUnfolder]: 0/30 cut-off events. [2021-03-25 17:39:58,392 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:58,392 INFO L84 FinitePrefix]: Finished finitePrefix Result has 89 conditions, 30 events. 0/30 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 32 event pairs, 0 based on Foata normal form. 0/30 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-25 17:39:58,392 INFO L142 LiptonReduction]: Number of co-enabled transitions 392 [2021-03-25 17:39:58,394 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:39:58,394 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:39:58,394 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 17:39:58,394 INFO L480 AbstractCegarLoop]: Abstraction has has 61 places, 30 transitions, 132 flow [2021-03-25 17:39:58,395 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) [2021-03-25 17:39:58,395 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:58,395 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:39:58,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-03-25 17:39:58,395 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:58,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:58,395 INFO L82 PathProgramCache]: Analyzing trace with hash -138593667, now seen corresponding path program 1 times [2021-03-25 17:39:58,395 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:58,395 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51512320] [2021-03-25 17:39:58,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:58,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:58,399 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:58,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:39:58,401 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:39:58,403 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:39:58,403 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:39:58,403 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-03-25 17:39:58,403 WARN L342 ceAbstractionStarter]: 14 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:39:58,404 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 15 thread instances. [2021-03-25 17:39:58,421 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:39:58,421 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:39:58,422 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:39:58,422 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:39:58,422 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:39:58,422 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:39:58,422 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:39:58,422 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:39:58,422 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:39:58,422 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:39:58,423 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 81 places, 50 transitions, 385 flow [2021-03-25 17:39:58,428 INFO L129 PetriNetUnfolder]: 0/95 cut-off events. [2021-03-25 17:39:58,429 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:58,429 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. [2021-03-25 17:39:58,429 INFO L82 GeneralOperation]: Start removeDead. Operand has 81 places, 50 transitions, 385 flow [2021-03-25 17:39:58,429 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 79 places, 48 transitions, 381 flow [2021-03-25 17:39:58,430 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:39:58,430 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-25 17:39:58,430 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-25 17:39:58,430 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 79 places, 48 transitions, 381 flow [2021-03-25 17:39:58,434 INFO L129 PetriNetUnfolder]: 0/63 cut-off events. [2021-03-25 17:39:58,434 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:58,435 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. [2021-03-25 17:39:58,436 INFO L142 LiptonReduction]: Number of co-enabled transitions 1380 [2021-03-25 17:39:58,887 INFO L154 LiptonReduction]: Checked pairs total: 555 [2021-03-25 17:39:58,887 INFO L156 LiptonReduction]: Total number of compositions: 15 [2021-03-25 17:39:58,887 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 457 [2021-03-25 17:39:58,888 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 17:39:58,888 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:39:58,888 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:39:58,888 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:39:58,888 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:39:58,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:39:58,889 INFO L82 PathProgramCache]: Analyzing trace with hash 18339, now seen corresponding path program 1 times [2021-03-25 17:39:58,889 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:39:58,889 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852393448] [2021-03-25 17:39:58,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:39:58,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:39:58,900 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:39:58,901 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:39:58,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:39:58,903 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852393448] [2021-03-25 17:39:58,903 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:39:58,904 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:39:58,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465500538] [2021-03-25 17:39:58,904 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:39:58,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:39:58,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:39:58,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:39:58,905 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 65 [2021-03-25 17:39:58,905 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) [2021-03-25 17:39:58,905 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:39:58,905 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 65 [2021-03-25 17:39:58,905 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:40:31,955 INFO L129 PetriNetUnfolder]: 212993/245777 cut-off events. [2021-03-25 17:40:31,955 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:40:34,930 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. [2021-03-25 17:40:35,660 INFO L132 encePairwiseOnDemand]: 63/65 looper letters, 15 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2021-03-25 17:40:35,660 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 32 transitions, 381 flow [2021-03-25 17:40:35,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:40:35,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:40:35,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 113 transitions. [2021-03-25 17:40:35,661 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5794871794871795 [2021-03-25 17:40:35,661 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 113 transitions. [2021-03-25 17:40:35,661 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 113 transitions. [2021-03-25 17:40:35,661 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:40:35,661 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 113 transitions. [2021-03-25 17:40:35,662 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) [2021-03-25 17:40:35,662 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) [2021-03-25 17:40:35,662 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) [2021-03-25 17:40:35,662 INFO L185 Difference]: Start difference. First operand has 64 places, 33 transitions, 351 flow. Second operand 3 states and 113 transitions. [2021-03-25 17:40:35,662 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 32 transitions, 381 flow [2021-03-25 17:40:35,664 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 32 transitions, 171 flow, removed 105 selfloop flow, removed 0 redundant places. [2021-03-25 17:40:35,665 INFO L241 Difference]: Finished difference. Result has 65 places, 32 transitions, 141 flow [2021-03-25 17:40:35,665 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} [2021-03-25 17:40:35,665 INFO L343 CegarLoopForPetriNet]: 64 programPoint places, 1 predicate places. [2021-03-25 17:40:35,665 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:40:35,666 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 65 places, 32 transitions, 141 flow [2021-03-25 17:40:35,666 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 65 places, 32 transitions, 141 flow [2021-03-25 17:40:35,666 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 65 places, 32 transitions, 141 flow [2021-03-25 17:40:35,668 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-25 17:40:35,668 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:40:35,668 INFO L84 FinitePrefix]: Finished finitePrefix Result has 95 conditions, 32 events. 0/32 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 29 event pairs, 0 based on Foata normal form. 0/32 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-25 17:40:35,669 INFO L142 LiptonReduction]: Number of co-enabled transitions 450 [2021-03-25 17:40:35,670 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:40:35,671 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:40:35,671 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-03-25 17:40:35,671 INFO L480 AbstractCegarLoop]: Abstraction has has 65 places, 32 transitions, 141 flow [2021-03-25 17:40:35,671 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) [2021-03-25 17:40:35,671 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:40:35,671 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:40:35,671 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-03-25 17:40:35,671 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:40:35,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:40:35,672 INFO L82 PathProgramCache]: Analyzing trace with hash -1465640138, now seen corresponding path program 1 times [2021-03-25 17:40:35,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:40:35,672 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300861310] [2021-03-25 17:40:35,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:40:35,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:40:35,675 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:40:35,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:40:35,677 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:40:35,678 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:40:35,678 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:40:35,679 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-03-25 17:40:35,679 WARN L342 ceAbstractionStarter]: 15 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:40:35,679 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 16 thread instances. [2021-03-25 17:40:35,700 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:40:35,700 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:40:35,701 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:40:35,701 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:40:35,701 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:40:35,701 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:40:35,701 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:40:35,701 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:40:35,701 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:40:35,702 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:40:35,702 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 86 places, 53 transitions, 426 flow [2021-03-25 17:40:35,708 INFO L129 PetriNetUnfolder]: 0/101 cut-off events. [2021-03-25 17:40:35,708 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:40:35,708 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. [2021-03-25 17:40:35,708 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 53 transitions, 426 flow [2021-03-25 17:40:35,708 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 84 places, 51 transitions, 422 flow [2021-03-25 17:40:35,708 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:40:35,709 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-25 17:40:35,709 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-25 17:40:35,709 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 84 places, 51 transitions, 422 flow [2021-03-25 17:40:35,713 INFO L129 PetriNetUnfolder]: 0/67 cut-off events. [2021-03-25 17:40:35,713 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:40:35,713 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. [2021-03-25 17:40:35,714 INFO L142 LiptonReduction]: Number of co-enabled transitions 1568 [2021-03-25 17:40:36,270 INFO L154 LiptonReduction]: Checked pairs total: 632 [2021-03-25 17:40:36,270 INFO L156 LiptonReduction]: Total number of compositions: 16 [2021-03-25 17:40:36,270 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 562 [2021-03-25 17:40:36,271 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 17:40:36,271 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:40:36,271 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:40:36,271 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:40:36,271 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:40:36,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:40:36,272 INFO L82 PathProgramCache]: Analyzing trace with hash 20515, now seen corresponding path program 1 times [2021-03-25 17:40:36,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:40:36,272 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693457528] [2021-03-25 17:40:36,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:40:36,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:40:36,278 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:40:36,279 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:40:36,281 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:40:36,281 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693457528] [2021-03-25 17:40:36,281 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:40:36,281 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:40:36,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774180860] [2021-03-25 17:40:36,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:40:36,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:40:36,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:40:36,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:40:36,282 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 34 out of 69 [2021-03-25 17:40:36,282 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) [2021-03-25 17:40:36,282 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:40:36,282 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 34 of 69 [2021-03-25 17:40:36,282 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 17:42:11,020 INFO L129 PetriNetUnfolder]: 458753/524306 cut-off events. [2021-03-25 17:42:11,021 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:42:17,723 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. [2021-03-25 17:42:19,433 INFO L132 encePairwiseOnDemand]: 67/69 looper letters, 16 selfloop transitions, 1 changer transitions 0/34 dead transitions. [2021-03-25 17:42:19,433 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 34 transitions, 422 flow [2021-03-25 17:42:19,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 17:42:19,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 17:42:19,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 120 transitions. [2021-03-25 17:42:19,434 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5797101449275363 [2021-03-25 17:42:19,434 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 120 transitions. [2021-03-25 17:42:19,434 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 120 transitions. [2021-03-25 17:42:19,436 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 17:42:19,436 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 120 transitions. [2021-03-25 17:42:19,436 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) [2021-03-25 17:42:19,436 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) [2021-03-25 17:42:19,437 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) [2021-03-25 17:42:19,437 INFO L185 Difference]: Start difference. First operand has 68 places, 35 transitions, 390 flow. Second operand 3 states and 120 transitions. [2021-03-25 17:42:19,437 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 34 transitions, 422 flow [2021-03-25 17:42:19,439 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 34 transitions, 182 flow, removed 120 selfloop flow, removed 0 redundant places. [2021-03-25 17:42:19,439 INFO L241 Difference]: Finished difference. Result has 69 places, 34 transitions, 150 flow [2021-03-25 17:42:19,439 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} [2021-03-25 17:42:19,440 INFO L343 CegarLoopForPetriNet]: 68 programPoint places, 1 predicate places. [2021-03-25 17:42:19,440 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:42:19,440 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 69 places, 34 transitions, 150 flow [2021-03-25 17:42:19,440 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 69 places, 34 transitions, 150 flow [2021-03-25 17:42:19,440 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 69 places, 34 transitions, 150 flow [2021-03-25 17:42:19,442 INFO L129 PetriNetUnfolder]: 0/34 cut-off events. [2021-03-25 17:42:19,442 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:42:19,443 INFO L84 FinitePrefix]: Finished finitePrefix Result has 101 conditions, 34 events. 0/34 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 34 event pairs, 0 based on Foata normal form. 0/34 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-25 17:42:19,443 INFO L142 LiptonReduction]: Number of co-enabled transitions 512 [2021-03-25 17:42:19,445 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:42:19,445 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:42:19,445 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 17:42:19,446 INFO L480 AbstractCegarLoop]: Abstraction has has 69 places, 34 transitions, 150 flow [2021-03-25 17:42:19,446 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) [2021-03-25 17:42:19,446 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:42:19,446 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:42:19,446 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-03-25 17:42:19,446 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:42:19,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:42:19,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1833507392, now seen corresponding path program 1 times [2021-03-25 17:42:19,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:42:19,447 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817031840] [2021-03-25 17:42:19,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:42:19,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:42:19,450 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:42:19,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:42:19,451 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:42:19,456 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:42:19,456 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:42:19,456 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-03-25 17:42:19,456 WARN L342 ceAbstractionStarter]: 16 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 17:42:19,457 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 17 thread instances. [2021-03-25 17:42:19,474 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 17:42:19,475 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 17:42:19,475 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:42:19,476 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:42:19,476 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:42:19,476 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:42:19,476 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:42:19,476 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:42:19,476 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:42:19,476 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:42:19,477 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 91 places, 56 transitions, 469 flow [2021-03-25 17:42:19,482 INFO L129 PetriNetUnfolder]: 0/107 cut-off events. [2021-03-25 17:42:19,483 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:42:19,483 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. [2021-03-25 17:42:19,483 INFO L82 GeneralOperation]: Start removeDead. Operand has 91 places, 56 transitions, 469 flow [2021-03-25 17:42:19,483 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 89 places, 54 transitions, 465 flow [2021-03-25 17:42:19,483 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:42:19,484 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-25 17:42:19,484 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-25 17:42:19,484 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 89 places, 54 transitions, 465 flow [2021-03-25 17:42:19,489 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-25 17:42:19,489 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:42:19,489 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. [2021-03-25 17:42:19,490 INFO L142 LiptonReduction]: Number of co-enabled transitions 1768 [2021-03-25 17:42:19,987 INFO L154 LiptonReduction]: Checked pairs total: 714 [2021-03-25 17:42:19,987 INFO L156 LiptonReduction]: Total number of compositions: 17 [2021-03-25 17:42:19,987 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 504 [2021-03-25 17:42:19,987 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 17:42:19,988 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 17:42:19,988 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:42:19,988 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 17:42:19,988 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:42:19,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:42:19,988 INFO L82 PathProgramCache]: Analyzing trace with hash 22819, now seen corresponding path program 1 times [2021-03-25 17:42:19,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:42:19,988 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922052315] [2021-03-25 17:42:19,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:42:19,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 17:42:19,996 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 17:42:19,997 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 17:42:19,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 17:42:19,999 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922052315] [2021-03-25 17:42:19,999 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 17:42:19,999 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 17:42:19,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528884980] [2021-03-25 17:42:20,000 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 17:42:20,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 17:42:20,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 17:42:20,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 17:42:20,000 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 73 [2021-03-25 17:42:20,000 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) [2021-03-25 17:42:20,001 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 17:42:20,001 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 73 [2021-03-25 17:42:20,001 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand