/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-RepeatedVariableLbe.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 07:40:16,217 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-25 07:40:16,220 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-25 07:40:16,257 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-25 07:40:16,315 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-RepeatedVariableLbe.epf [2021-03-25 07:40:16,348 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-25 07:40:16,348 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-25 07:40:16,351 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-25 07:40:16,351 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-25 07:40:16,352 INFO L138 SettingsManager]: * Use SBE=true [2021-03-25 07:40:16,352 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-25 07:40:16,352 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-25 07:40:16,352 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-25 07:40:16,352 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-25 07:40:16,353 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-25 07:40:16,353 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-25 07:40:16,353 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-25 07:40:16,354 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-25 07:40:16,354 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-25 07:40:16,354 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-25 07:40:16,354 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-25 07:40:16,354 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-25 07:40:16,354 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-25 07:40:16,354 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-25 07:40:16,354 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-25 07:40:16,355 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-25 07:40:16,355 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-25 07:40:16,355 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-25 07:40:16,355 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-25 07:40:16,355 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-25 07:40:16,355 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-25 07:40:16,356 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-25 07:40:16,356 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=VARIABLE_BASED_MOVER_CHECK [2021-03-25 07:40:16,356 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-25 07:40:16,356 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-03-25 07:40:16,356 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-25 07:40:16,671 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-25 07:40:16,746 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-25 07:40:16,749 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-25 07:40:16,749 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-25 07:40:16,750 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-25 07:40:16,751 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl [2021-03-25 07:40:16,752 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl' [2021-03-25 07:40:16,796 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-25 07:40:16,797 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-25 07:40:16,798 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-25 07:40:16,798 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-25 07:40:16,798 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-25 07:40:16,815 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,829 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,836 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-25 07:40:16,841 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-25 07:40:16,841 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-25 07:40:16,841 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-25 07:40:16,847 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,848 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,848 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,848 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,850 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,851 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,852 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 07:40:16" (1/1) ... [2021-03-25 07:40:16,852 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-25 07:40:16,853 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-25 07:40:16,853 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-25 07:40:16,853 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-25 07:40:16,860 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 07:40:16" (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 07:40:16,923 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-25 07:40:16,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-25 07:40:16,924 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-25 07:40:16,924 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-03-25 07:40:16,924 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-03-25 07:40:16,924 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-03-25 07:40:16,925 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 07:40:17,025 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-25 07:40:17,025 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-25 07:40:17,027 INFO L202 PluginConnector]: Adding new model fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 07:40:17 BoogieIcfgContainer [2021-03-25 07:40:17,027 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-25 07:40:17,028 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-25 07:40:17,028 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-25 07:40:17,030 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-25 07:40:17,030 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 07:40:16" (1/2) ... [2021-03-25 07:40:17,031 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e58eee0 and model type fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.03 07:40:17, skipping insertion in model container [2021-03-25 07:40:17,031 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 07:40:17" (2/2) ... [2021-03-25 07:40:17,032 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_inc.bpl [2021-03-25 07:40:17,053 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-25 07:40:17,057 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-25 07:40:17,058 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-25 07:40:17,088 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:17,103 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:17,136 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:17,136 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:17,136 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:17,136 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:17,136 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:17,136 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:17,137 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:17,137 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:17,146 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 8 transitions, 21 flow [2021-03-25 07:40:17,164 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-25 07:40:17,164 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,166 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 07:40:17,167 INFO L82 GeneralOperation]: Start removeDead. Operand has 11 places, 8 transitions, 21 flow [2021-03-25 07:40:17,170 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 9 places, 6 transitions, 17 flow [2021-03-25 07:40:17,171 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,180 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-25 07:40:17,184 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-25 07:40:17,186 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 6 transitions, 17 flow [2021-03-25 07:40:17,191 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-25 07:40:17,191 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,192 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 07:40:17,193 INFO L142 LiptonReduction]: Number of co-enabled transitions 8 [2021-03-25 07:40:17,232 INFO L154 LiptonReduction]: Checked pairs total: 4 [2021-03-25 07:40:17,232 INFO L156 LiptonReduction]: Total number of compositions: 1 [2021-03-25 07:40:17,235 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 65 [2021-03-25 07:40:17,243 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 07:40:17,243 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,243 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,244 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:17,244 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1315, now seen corresponding path program 1 times [2021-03-25 07:40:17,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,259 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047544175] [2021-03-25 07:40:17,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:17,349 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:17,350 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:17,373 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 07:40:17,374 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047544175] [2021-03-25 07:40:17,375 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:17,375 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:17,375 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329118821] [2021-03-25 07:40:17,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:17,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:17,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:17,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:17,396 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 9 [2021-03-25 07:40:17,397 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 07:40:17,397 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:17,397 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 9 [2021-03-25 07:40:17,398 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:17,414 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-25 07:40:17,415 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,415 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 07:40:17,416 INFO L132 encePairwiseOnDemand]: 7/9 looper letters, 1 selfloop transitions, 1 changer transitions 0/4 dead transitions. [2021-03-25 07:40:17,416 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 9 places, 4 transitions, 17 flow [2021-03-25 07:40:17,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:17,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:17,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 15 transitions. [2021-03-25 07:40:17,425 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5555555555555556 [2021-03-25 07:40:17,426 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 15 transitions. [2021-03-25 07:40:17,427 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 15 transitions. [2021-03-25 07:40:17,428 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:17,429 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 15 transitions. [2021-03-25 07:40:17,431 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 07:40:17,435 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 07:40:17,436 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 07:40:17,437 INFO L185 Difference]: Start difference. First operand has 8 places, 5 transitions, 15 flow. Second operand 3 states and 15 transitions. [2021-03-25 07:40:17,438 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 9 places, 4 transitions, 17 flow [2021-03-25 07:40:17,441 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 07:40:17,450 INFO L241 Difference]: Finished difference. Result has 9 places, 4 transitions, 15 flow [2021-03-25 07:40:17,452 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 07:40:17,453 INFO L343 CegarLoopForPetriNet]: 8 programPoint places, 1 predicate places. [2021-03-25 07:40:17,453 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,453 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 4 transitions, 15 flow [2021-03-25 07:40:17,453 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 4 transitions, 15 flow [2021-03-25 07:40:17,454 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 4 transitions, 15 flow [2021-03-25 07:40:17,457 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-25 07:40:17,457 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,457 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 07:40:17,457 INFO L142 LiptonReduction]: Number of co-enabled transitions 2 [2021-03-25 07:40:17,458 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:17,458 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:17,458 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:17,459 INFO L480 AbstractCegarLoop]: Abstraction has has 9 places, 4 transitions, 15 flow [2021-03-25 07:40:17,459 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 07:40:17,459 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,459 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-25 07:40:17,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-25 07:40:17,460 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,460 INFO L82 PathProgramCache]: Analyzing trace with hash 41033, now seen corresponding path program 1 times [2021-03-25 07:40:17,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,461 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473160536] [2021-03-25 07:40:17,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:17,474 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:17,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:17,478 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:17,489 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:17,489 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:17,490 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-25 07:40:17,491 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:17,491 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-25 07:40:17,516 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:17,517 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:17,518 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:17,518 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:17,518 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:17,518 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:17,518 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:17,518 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:17,518 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:17,519 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:17,519 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 16 places, 11 transitions, 34 flow [2021-03-25 07:40:17,537 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-25 07:40:17,537 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,537 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 07:40:17,537 INFO L82 GeneralOperation]: Start removeDead. Operand has 16 places, 11 transitions, 34 flow [2021-03-25 07:40:17,538 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 9 transitions, 30 flow [2021-03-25 07:40:17,538 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,538 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-25 07:40:17,538 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-25 07:40:17,538 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 14 places, 9 transitions, 30 flow [2021-03-25 07:40:17,541 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-25 07:40:17,541 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,541 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 07:40:17,541 INFO L142 LiptonReduction]: Number of co-enabled transitions 28 [2021-03-25 07:40:17,576 INFO L154 LiptonReduction]: Checked pairs total: 18 [2021-03-25 07:40:17,576 INFO L156 LiptonReduction]: Total number of compositions: 2 [2021-03-25 07:40:17,576 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 38 [2021-03-25 07:40:17,578 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:40:17,578 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,578 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,578 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:17,578 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1699, now seen corresponding path program 1 times [2021-03-25 07:40:17,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,579 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381395808] [2021-03-25 07:40:17,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:17,585 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:17,585 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:17,588 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 07:40:17,589 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381395808] [2021-03-25 07:40:17,589 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:17,589 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:17,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489351162] [2021-03-25 07:40:17,589 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:17,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:17,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:17,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:17,590 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 13 [2021-03-25 07:40:17,591 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 07:40:17,591 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:17,591 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 13 [2021-03-25 07:40:17,591 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:17,597 INFO L129 PetriNetUnfolder]: 1/8 cut-off events. [2021-03-25 07:40:17,597 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,598 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 07:40:17,599 INFO L132 encePairwiseOnDemand]: 11/13 looper letters, 2 selfloop transitions, 1 changer transitions 0/6 dead transitions. [2021-03-25 07:40:17,599 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 13 places, 6 transitions, 30 flow [2021-03-25 07:40:17,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:17,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:17,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 22 transitions. [2021-03-25 07:40:17,600 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5641025641025641 [2021-03-25 07:40:17,600 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 22 transitions. [2021-03-25 07:40:17,600 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 22 transitions. [2021-03-25 07:40:17,600 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:17,600 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 22 transitions. [2021-03-25 07:40:17,600 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 07:40:17,601 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 07:40:17,601 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 07:40:17,601 INFO L185 Difference]: Start difference. First operand has 12 places, 7 transitions, 26 flow. Second operand 3 states and 22 transitions. [2021-03-25 07:40:17,601 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 13 places, 6 transitions, 30 flow [2021-03-25 07:40:17,602 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 07:40:17,602 INFO L241 Difference]: Finished difference. Result has 13 places, 6 transitions, 24 flow [2021-03-25 07:40:17,602 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 07:40:17,602 INFO L343 CegarLoopForPetriNet]: 12 programPoint places, 1 predicate places. [2021-03-25 07:40:17,602 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,603 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 13 places, 6 transitions, 24 flow [2021-03-25 07:40:17,603 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 13 places, 6 transitions, 24 flow [2021-03-25 07:40:17,603 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 6 transitions, 24 flow [2021-03-25 07:40:17,605 INFO L129 PetriNetUnfolder]: 0/6 cut-off events. [2021-03-25 07:40:17,605 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,605 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 07:40:17,605 INFO L142 LiptonReduction]: Number of co-enabled transitions 8 [2021-03-25 07:40:17,606 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:17,606 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:17,606 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-25 07:40:17,606 INFO L480 AbstractCegarLoop]: Abstraction has has 13 places, 6 transitions, 24 flow [2021-03-25 07:40:17,607 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 07:40:17,607 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,607 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-25 07:40:17,607 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-25 07:40:17,607 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1643499, now seen corresponding path program 1 times [2021-03-25 07:40:17,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,608 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243933355] [2021-03-25 07:40:17,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:17,611 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:17,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:17,624 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:17,625 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:17,625 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:17,626 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-25 07:40:17,626 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:17,629 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-25 07:40:17,644 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:17,645 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:17,646 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:17,646 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:17,646 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:17,646 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:17,646 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:17,646 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:17,646 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:17,646 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:17,647 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 14 transitions, 49 flow [2021-03-25 07:40:17,651 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-25 07:40:17,651 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,652 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 07:40:17,652 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 14 transitions, 49 flow [2021-03-25 07:40:17,652 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 19 places, 12 transitions, 45 flow [2021-03-25 07:40:17,652 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,652 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-25 07:40:17,653 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-25 07:40:17,653 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 19 places, 12 transitions, 45 flow [2021-03-25 07:40:17,656 INFO L129 PetriNetUnfolder]: 0/15 cut-off events. [2021-03-25 07:40:17,656 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,656 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 07:40:17,656 INFO L142 LiptonReduction]: Number of co-enabled transitions 60 [2021-03-25 07:40:17,688 INFO L154 LiptonReduction]: Checked pairs total: 42 [2021-03-25 07:40:17,688 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-25 07:40:17,688 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 36 [2021-03-25 07:40:17,690 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:40:17,690 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,690 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,690 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:17,690 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,691 INFO L82 PathProgramCache]: Analyzing trace with hash 2211, now seen corresponding path program 1 times [2021-03-25 07:40:17,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,691 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240228799] [2021-03-25 07:40:17,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:17,697 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:17,698 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:17,701 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 07:40:17,701 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240228799] [2021-03-25 07:40:17,702 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:17,702 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:17,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604575758] [2021-03-25 07:40:17,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:17,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:17,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:17,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:17,703 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 17 [2021-03-25 07:40:17,704 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 07:40:17,704 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:17,704 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 17 [2021-03-25 07:40:17,704 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:17,715 INFO L129 PetriNetUnfolder]: 5/17 cut-off events. [2021-03-25 07:40:17,715 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,716 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 07:40:17,716 INFO L132 encePairwiseOnDemand]: 15/17 looper letters, 3 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2021-03-25 07:40:17,716 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 8 transitions, 45 flow [2021-03-25 07:40:17,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:17,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:17,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 29 transitions. [2021-03-25 07:40:17,718 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5686274509803921 [2021-03-25 07:40:17,718 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 29 transitions. [2021-03-25 07:40:17,718 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 29 transitions. [2021-03-25 07:40:17,718 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:17,718 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 29 transitions. [2021-03-25 07:40:17,719 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 07:40:17,719 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 07:40:17,719 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 07:40:17,720 INFO L185 Difference]: Start difference. First operand has 16 places, 9 transitions, 39 flow. Second operand 3 states and 29 transitions. [2021-03-25 07:40:17,720 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 8 transitions, 45 flow [2021-03-25 07:40:17,720 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 07:40:17,721 INFO L241 Difference]: Finished difference. Result has 17 places, 8 transitions, 33 flow [2021-03-25 07:40:17,721 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 07:40:17,721 INFO L343 CegarLoopForPetriNet]: 16 programPoint places, 1 predicate places. [2021-03-25 07:40:17,721 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,721 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 17 places, 8 transitions, 33 flow [2021-03-25 07:40:17,722 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 17 places, 8 transitions, 33 flow [2021-03-25 07:40:17,722 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 17 places, 8 transitions, 33 flow [2021-03-25 07:40:17,724 INFO L129 PetriNetUnfolder]: 0/8 cut-off events. [2021-03-25 07:40:17,724 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,724 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 07:40:17,725 INFO L142 LiptonReduction]: Number of co-enabled transitions 18 [2021-03-25 07:40:17,725 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:17,725 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:17,726 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:17,726 INFO L480 AbstractCegarLoop]: Abstraction has has 17 places, 8 transitions, 33 flow [2021-03-25 07:40:17,726 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 07:40:17,727 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,727 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-03-25 07:40:17,727 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-25 07:40:17,727 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,727 INFO L82 PathProgramCache]: Analyzing trace with hash 66279044, now seen corresponding path program 1 times [2021-03-25 07:40:17,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,728 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717582830] [2021-03-25 07:40:17,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:17,732 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:17,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:17,734 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:17,735 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:17,735 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:17,735 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-25 07:40:17,736 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:17,736 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-25 07:40:17,749 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:17,749 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:17,750 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:17,750 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:17,750 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:17,750 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:17,750 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:17,750 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:17,750 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:17,751 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:17,751 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 17 transitions, 66 flow [2021-03-25 07:40:17,760 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-03-25 07:40:17,760 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,760 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 07:40:17,760 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 17 transitions, 66 flow [2021-03-25 07:40:17,761 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 15 transitions, 62 flow [2021-03-25 07:40:17,761 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,761 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-25 07:40:17,761 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-25 07:40:17,761 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 15 transitions, 62 flow [2021-03-25 07:40:17,765 INFO L129 PetriNetUnfolder]: 0/19 cut-off events. [2021-03-25 07:40:17,765 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,765 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 07:40:17,765 INFO L142 LiptonReduction]: Number of co-enabled transitions 104 [2021-03-25 07:40:17,802 INFO L154 LiptonReduction]: Checked pairs total: 76 [2021-03-25 07:40:17,802 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-25 07:40:17,802 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 41 [2021-03-25 07:40:17,804 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:40:17,804 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,804 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,804 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:17,804 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,804 INFO L82 PathProgramCache]: Analyzing trace with hash 2851, now seen corresponding path program 1 times [2021-03-25 07:40:17,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,805 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106758840] [2021-03-25 07:40:17,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:17,819 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:17,820 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:17,823 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 07:40:17,824 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106758840] [2021-03-25 07:40:17,824 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:17,824 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:17,824 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129843617] [2021-03-25 07:40:17,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:17,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:17,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:17,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:17,825 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 21 [2021-03-25 07:40:17,826 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 07:40:17,826 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:17,826 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 21 [2021-03-25 07:40:17,826 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:17,852 INFO L129 PetriNetUnfolder]: 17/38 cut-off events. [2021-03-25 07:40:17,852 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,853 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 07:40:17,853 INFO L132 encePairwiseOnDemand]: 19/21 looper letters, 4 selfloop transitions, 1 changer transitions 0/10 dead transitions. [2021-03-25 07:40:17,853 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 10 transitions, 62 flow [2021-03-25 07:40:17,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:17,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:17,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 36 transitions. [2021-03-25 07:40:17,859 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5714285714285714 [2021-03-25 07:40:17,860 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 36 transitions. [2021-03-25 07:40:17,861 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 36 transitions. [2021-03-25 07:40:17,861 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:17,861 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 36 transitions. [2021-03-25 07:40:17,861 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 07:40:17,862 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 07:40:17,862 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 07:40:17,862 INFO L185 Difference]: Start difference. First operand has 20 places, 11 transitions, 54 flow. Second operand 3 states and 36 transitions. [2021-03-25 07:40:17,863 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 10 transitions, 62 flow [2021-03-25 07:40:17,863 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 07:40:17,864 INFO L241 Difference]: Finished difference. Result has 21 places, 10 transitions, 42 flow [2021-03-25 07:40:17,864 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 07:40:17,864 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 1 predicate places. [2021-03-25 07:40:17,864 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,865 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 21 places, 10 transitions, 42 flow [2021-03-25 07:40:17,865 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 21 places, 10 transitions, 42 flow [2021-03-25 07:40:17,865 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 10 transitions, 42 flow [2021-03-25 07:40:17,867 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-03-25 07:40:17,868 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,868 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 07:40:17,868 INFO L142 LiptonReduction]: Number of co-enabled transitions 32 [2021-03-25 07:40:17,869 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:17,869 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:17,869 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:17,870 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 10 transitions, 42 flow [2021-03-25 07:40:17,870 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 07:40:17,870 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,870 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-25 07:40:17,870 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-25 07:40:17,870 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1646739026, now seen corresponding path program 1 times [2021-03-25 07:40:17,871 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,871 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238902648] [2021-03-25 07:40:17,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:17,891 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:17,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:17,893 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:17,895 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:17,895 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:17,895 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-25 07:40:17,895 WARN L342 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:17,896 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-03-25 07:40:17,913 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:17,913 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:17,914 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:17,915 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:17,915 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:17,915 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:17,915 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:17,915 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:17,915 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:17,915 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:17,918 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 20 transitions, 85 flow [2021-03-25 07:40:17,939 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-25 07:40:17,939 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,939 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 07:40:17,939 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 20 transitions, 85 flow [2021-03-25 07:40:17,940 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 18 transitions, 81 flow [2021-03-25 07:40:17,940 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:17,940 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-25 07:40:17,941 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-25 07:40:17,941 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 18 transitions, 81 flow [2021-03-25 07:40:17,944 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-25 07:40:17,944 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,944 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 07:40:17,945 INFO L142 LiptonReduction]: Number of co-enabled transitions 160 [2021-03-25 07:40:17,979 INFO L154 LiptonReduction]: Checked pairs total: 120 [2021-03-25 07:40:17,979 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-25 07:40:17,979 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 39 [2021-03-25 07:40:17,981 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 07:40:17,981 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:17,981 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:17,981 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:17,981 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:17,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:17,982 INFO L82 PathProgramCache]: Analyzing trace with hash 3619, now seen corresponding path program 1 times [2021-03-25 07:40:17,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:17,982 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121336590] [2021-03-25 07:40:17,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:17,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:17,987 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:17,987 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:17,990 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 07:40:17,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121336590] [2021-03-25 07:40:17,990 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:17,991 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:17,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246381295] [2021-03-25 07:40:17,991 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:17,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:17,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:17,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:17,992 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-03-25 07:40:17,992 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 07:40:17,993 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:17,993 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-03-25 07:40:17,993 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:18,015 INFO L129 PetriNetUnfolder]: 49/87 cut-off events. [2021-03-25 07:40:18,015 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,017 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 07:40:18,018 INFO L132 encePairwiseOnDemand]: 23/25 looper letters, 5 selfloop transitions, 1 changer transitions 0/12 dead transitions. [2021-03-25 07:40:18,018 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 12 transitions, 81 flow [2021-03-25 07:40:18,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:18,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:18,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 43 transitions. [2021-03-25 07:40:18,019 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5733333333333334 [2021-03-25 07:40:18,019 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 43 transitions. [2021-03-25 07:40:18,020 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 43 transitions. [2021-03-25 07:40:18,020 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:18,020 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 43 transitions. [2021-03-25 07:40:18,020 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 07:40:18,021 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 07:40:18,021 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 07:40:18,021 INFO L185 Difference]: Start difference. First operand has 24 places, 13 transitions, 71 flow. Second operand 3 states and 43 transitions. [2021-03-25 07:40:18,022 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 12 transitions, 81 flow [2021-03-25 07:40:18,023 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 07:40:18,023 INFO L241 Difference]: Finished difference. Result has 25 places, 12 transitions, 51 flow [2021-03-25 07:40:18,023 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 07:40:18,024 INFO L343 CegarLoopForPetriNet]: 24 programPoint places, 1 predicate places. [2021-03-25 07:40:18,024 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,024 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 25 places, 12 transitions, 51 flow [2021-03-25 07:40:18,024 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 25 places, 12 transitions, 51 flow [2021-03-25 07:40:18,025 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 25 places, 12 transitions, 51 flow [2021-03-25 07:40:18,027 INFO L129 PetriNetUnfolder]: 0/12 cut-off events. [2021-03-25 07:40:18,027 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,027 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 07:40:18,027 INFO L142 LiptonReduction]: Number of co-enabled transitions 50 [2021-03-25 07:40:18,028 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:18,028 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:18,028 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-25 07:40:18,029 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 12 transitions, 51 flow [2021-03-25 07:40:18,029 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 07:40:18,029 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,029 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:18,029 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-25 07:40:18,030 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1085119695, now seen corresponding path program 1 times [2021-03-25 07:40:18,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,030 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633826537] [2021-03-25 07:40:18,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,034 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,037 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,038 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:18,038 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:18,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-25 07:40:18,039 WARN L342 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:18,039 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-03-25 07:40:18,049 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:18,049 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:18,050 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:18,050 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:18,050 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:18,050 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:18,050 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:18,050 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:18,050 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:18,050 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:18,051 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 36 places, 23 transitions, 106 flow [2021-03-25 07:40:18,055 INFO L129 PetriNetUnfolder]: 0/41 cut-off events. [2021-03-25 07:40:18,055 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,056 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 07:40:18,056 INFO L82 GeneralOperation]: Start removeDead. Operand has 36 places, 23 transitions, 106 flow [2021-03-25 07:40:18,056 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 21 transitions, 102 flow [2021-03-25 07:40:18,056 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,057 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-25 07:40:18,057 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-25 07:40:18,057 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 21 transitions, 102 flow [2021-03-25 07:40:18,060 INFO L129 PetriNetUnfolder]: 0/27 cut-off events. [2021-03-25 07:40:18,060 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,060 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 07:40:18,061 INFO L142 LiptonReduction]: Number of co-enabled transitions 228 [2021-03-25 07:40:18,101 INFO L154 LiptonReduction]: Checked pairs total: 174 [2021-03-25 07:40:18,101 INFO L156 LiptonReduction]: Total number of compositions: 6 [2021-03-25 07:40:18,101 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 45 [2021-03-25 07:40:18,102 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:40:18,102 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,103 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,103 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:18,103 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,103 INFO L82 PathProgramCache]: Analyzing trace with hash 4515, now seen corresponding path program 1 times [2021-03-25 07:40:18,103 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,104 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816856141] [2021-03-25 07:40:18,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:18,109 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:18,109 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:18,112 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 07:40:18,112 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816856141] [2021-03-25 07:40:18,112 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:18,112 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:18,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791496888] [2021-03-25 07:40:18,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:18,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:18,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:18,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:18,114 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 29 [2021-03-25 07:40:18,114 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 07:40:18,114 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:18,114 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 29 [2021-03-25 07:40:18,115 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:18,147 INFO L129 PetriNetUnfolder]: 129/200 cut-off events. [2021-03-25 07:40:18,148 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,149 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 07:40:18,150 INFO L132 encePairwiseOnDemand]: 27/29 looper letters, 6 selfloop transitions, 1 changer transitions 0/14 dead transitions. [2021-03-25 07:40:18,150 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 14 transitions, 102 flow [2021-03-25 07:40:18,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:18,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:18,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 50 transitions. [2021-03-25 07:40:18,152 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5747126436781609 [2021-03-25 07:40:18,152 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 50 transitions. [2021-03-25 07:40:18,152 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 50 transitions. [2021-03-25 07:40:18,152 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:18,152 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 50 transitions. [2021-03-25 07:40:18,153 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 07:40:18,153 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 07:40:18,153 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 07:40:18,153 INFO L185 Difference]: Start difference. First operand has 28 places, 15 transitions, 90 flow. Second operand 3 states and 50 transitions. [2021-03-25 07:40:18,153 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 14 transitions, 102 flow [2021-03-25 07:40:18,155 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 07:40:18,155 INFO L241 Difference]: Finished difference. Result has 29 places, 14 transitions, 60 flow [2021-03-25 07:40:18,155 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 07:40:18,155 INFO L343 CegarLoopForPetriNet]: 28 programPoint places, 1 predicate places. [2021-03-25 07:40:18,155 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,156 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 14 transitions, 60 flow [2021-03-25 07:40:18,156 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 14 transitions, 60 flow [2021-03-25 07:40:18,156 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 14 transitions, 60 flow [2021-03-25 07:40:18,158 INFO L129 PetriNetUnfolder]: 0/14 cut-off events. [2021-03-25 07:40:18,158 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,158 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 07:40:18,158 INFO L142 LiptonReduction]: Number of co-enabled transitions 72 [2021-03-25 07:40:18,159 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:18,159 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:18,160 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:18,160 INFO L480 AbstractCegarLoop]: Abstraction has has 29 places, 14 transitions, 60 flow [2021-03-25 07:40:18,160 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 07:40:18,161 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,161 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:18,161 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-25 07:40:18,161 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1719135375, now seen corresponding path program 1 times [2021-03-25 07:40:18,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,162 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215159298] [2021-03-25 07:40:18,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,167 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,170 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,172 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:18,172 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:18,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-03-25 07:40:18,172 WARN L342 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:18,172 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-03-25 07:40:18,183 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:18,183 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:18,184 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:18,184 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:18,184 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:18,184 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:18,184 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:18,184 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:18,184 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:18,185 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:18,185 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 26 transitions, 129 flow [2021-03-25 07:40:18,189 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-25 07:40:18,189 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,189 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 07:40:18,189 INFO L82 GeneralOperation]: Start removeDead. Operand has 41 places, 26 transitions, 129 flow [2021-03-25 07:40:18,190 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 39 places, 24 transitions, 125 flow [2021-03-25 07:40:18,190 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,190 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-25 07:40:18,190 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-25 07:40:18,191 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 39 places, 24 transitions, 125 flow [2021-03-25 07:40:18,193 INFO L129 PetriNetUnfolder]: 0/31 cut-off events. [2021-03-25 07:40:18,193 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,194 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 07:40:18,194 INFO L142 LiptonReduction]: Number of co-enabled transitions 308 [2021-03-25 07:40:18,252 INFO L154 LiptonReduction]: Checked pairs total: 238 [2021-03-25 07:40:18,252 INFO L156 LiptonReduction]: Total number of compositions: 7 [2021-03-25 07:40:18,253 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 63 [2021-03-25 07:40:18,254 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:40:18,254 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,254 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,254 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:18,254 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,255 INFO L82 PathProgramCache]: Analyzing trace with hash 5539, now seen corresponding path program 1 times [2021-03-25 07:40:18,255 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,255 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762483568] [2021-03-25 07:40:18,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:18,261 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:18,261 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:18,263 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-25 07:40:18,264 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762483568] [2021-03-25 07:40:18,264 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:18,264 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:18,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982160115] [2021-03-25 07:40:18,264 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:18,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:18,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:18,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:18,265 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 33 [2021-03-25 07:40:18,265 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 07:40:18,265 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:18,265 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 33 [2021-03-25 07:40:18,265 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:18,314 INFO L129 PetriNetUnfolder]: 321/457 cut-off events. [2021-03-25 07:40:18,314 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,316 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 07:40:18,319 INFO L132 encePairwiseOnDemand]: 31/33 looper letters, 7 selfloop transitions, 1 changer transitions 0/16 dead transitions. [2021-03-25 07:40:18,319 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 16 transitions, 125 flow [2021-03-25 07:40:18,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:18,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:18,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 57 transitions. [2021-03-25 07:40:18,320 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5757575757575758 [2021-03-25 07:40:18,320 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 57 transitions. [2021-03-25 07:40:18,321 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 57 transitions. [2021-03-25 07:40:18,321 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:18,321 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 57 transitions. [2021-03-25 07:40:18,321 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 07:40:18,322 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 07:40:18,322 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 07:40:18,322 INFO L185 Difference]: Start difference. First operand has 32 places, 17 transitions, 111 flow. Second operand 3 states and 57 transitions. [2021-03-25 07:40:18,322 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 16 transitions, 125 flow [2021-03-25 07:40:18,323 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 07:40:18,324 INFO L241 Difference]: Finished difference. Result has 33 places, 16 transitions, 69 flow [2021-03-25 07:40:18,324 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 07:40:18,324 INFO L343 CegarLoopForPetriNet]: 32 programPoint places, 1 predicate places. [2021-03-25 07:40:18,324 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,324 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 33 places, 16 transitions, 69 flow [2021-03-25 07:40:18,325 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 33 places, 16 transitions, 69 flow [2021-03-25 07:40:18,325 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 33 places, 16 transitions, 69 flow [2021-03-25 07:40:18,327 INFO L129 PetriNetUnfolder]: 0/16 cut-off events. [2021-03-25 07:40:18,327 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,327 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 07:40:18,327 INFO L142 LiptonReduction]: Number of co-enabled transitions 98 [2021-03-25 07:40:18,328 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:18,328 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:18,328 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-25 07:40:18,329 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 16 transitions, 69 flow [2021-03-25 07:40:18,329 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 07:40:18,329 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,329 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:18,329 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-03-25 07:40:18,329 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,330 INFO L82 PathProgramCache]: Analyzing trace with hash 779611434, now seen corresponding path program 1 times [2021-03-25 07:40:18,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,330 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302813759] [2021-03-25 07:40:18,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,334 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,336 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,338 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:18,338 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:18,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-03-25 07:40:18,339 WARN L342 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:18,339 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2021-03-25 07:40:18,349 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:18,350 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:18,350 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:18,351 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:18,351 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:18,351 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:18,351 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:18,351 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:18,351 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:18,351 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:18,352 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 29 transitions, 154 flow [2021-03-25 07:40:18,356 INFO L129 PetriNetUnfolder]: 0/53 cut-off events. [2021-03-25 07:40:18,356 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,356 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 07:40:18,356 INFO L82 GeneralOperation]: Start removeDead. Operand has 46 places, 29 transitions, 154 flow [2021-03-25 07:40:18,357 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 44 places, 27 transitions, 150 flow [2021-03-25 07:40:18,357 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,357 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-25 07:40:18,357 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-25 07:40:18,357 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 44 places, 27 transitions, 150 flow [2021-03-25 07:40:18,360 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-25 07:40:18,360 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,360 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 07:40:18,361 INFO L142 LiptonReduction]: Number of co-enabled transitions 400 [2021-03-25 07:40:18,408 INFO L154 LiptonReduction]: Checked pairs total: 312 [2021-03-25 07:40:18,408 INFO L156 LiptonReduction]: Total number of compositions: 8 [2021-03-25 07:40:18,409 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 52 [2021-03-25 07:40:18,410 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:40:18,410 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,410 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,410 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:18,410 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,410 INFO L82 PathProgramCache]: Analyzing trace with hash 6691, now seen corresponding path program 1 times [2021-03-25 07:40:18,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,411 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90388584] [2021-03-25 07:40:18,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:18,416 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:18,416 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:18,418 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 07:40:18,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90388584] [2021-03-25 07:40:18,419 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:18,419 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:18,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436719720] [2021-03-25 07:40:18,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:18,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:18,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:18,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:18,420 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 37 [2021-03-25 07:40:18,420 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 07:40:18,420 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:18,420 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 37 [2021-03-25 07:40:18,420 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:18,520 INFO L129 PetriNetUnfolder]: 769/1034 cut-off events. [2021-03-25 07:40:18,520 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,525 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 07:40:18,532 INFO L132 encePairwiseOnDemand]: 35/37 looper letters, 8 selfloop transitions, 1 changer transitions 0/18 dead transitions. [2021-03-25 07:40:18,532 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 18 transitions, 150 flow [2021-03-25 07:40:18,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:18,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:18,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 64 transitions. [2021-03-25 07:40:18,535 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5765765765765766 [2021-03-25 07:40:18,535 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 64 transitions. [2021-03-25 07:40:18,535 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 64 transitions. [2021-03-25 07:40:18,536 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:18,537 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 64 transitions. [2021-03-25 07:40:18,537 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 07:40:18,539 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 07:40:18,539 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 07:40:18,539 INFO L185 Difference]: Start difference. First operand has 36 places, 19 transitions, 134 flow. Second operand 3 states and 64 transitions. [2021-03-25 07:40:18,539 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 18 transitions, 150 flow [2021-03-25 07:40:18,542 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 07:40:18,543 INFO L241 Difference]: Finished difference. Result has 37 places, 18 transitions, 78 flow [2021-03-25 07:40:18,543 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 07:40:18,543 INFO L343 CegarLoopForPetriNet]: 36 programPoint places, 1 predicate places. [2021-03-25 07:40:18,544 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,544 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 37 places, 18 transitions, 78 flow [2021-03-25 07:40:18,544 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 37 places, 18 transitions, 78 flow [2021-03-25 07:40:18,544 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 37 places, 18 transitions, 78 flow [2021-03-25 07:40:18,548 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-25 07:40:18,548 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,548 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 07:40:18,549 INFO L142 LiptonReduction]: Number of co-enabled transitions 128 [2021-03-25 07:40:18,550 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:18,550 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:18,550 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-03-25 07:40:18,558 INFO L480 AbstractCegarLoop]: Abstraction has has 37 places, 18 transitions, 78 flow [2021-03-25 07:40:18,559 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 07:40:18,559 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,559 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:18,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-03-25 07:40:18,559 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,560 INFO L82 PathProgramCache]: Analyzing trace with hash -2053304524, now seen corresponding path program 1 times [2021-03-25 07:40:18,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,561 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353188686] [2021-03-25 07:40:18,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,569 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,579 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,581 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:18,581 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:18,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-03-25 07:40:18,581 WARN L342 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:18,581 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2021-03-25 07:40:18,602 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:18,602 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:18,603 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:18,603 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:18,603 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:18,603 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:18,603 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:18,603 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:18,603 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:18,603 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:18,605 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 51 places, 32 transitions, 181 flow [2021-03-25 07:40:18,610 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-25 07:40:18,610 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,610 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 07:40:18,610 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 32 transitions, 181 flow [2021-03-25 07:40:18,611 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 30 transitions, 177 flow [2021-03-25 07:40:18,611 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,611 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-25 07:40:18,612 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-25 07:40:18,612 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 30 transitions, 177 flow [2021-03-25 07:40:18,622 INFO L129 PetriNetUnfolder]: 0/39 cut-off events. [2021-03-25 07:40:18,622 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,622 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 07:40:18,623 INFO L142 LiptonReduction]: Number of co-enabled transitions 504 [2021-03-25 07:40:18,684 INFO L154 LiptonReduction]: Checked pairs total: 396 [2021-03-25 07:40:18,684 INFO L156 LiptonReduction]: Total number of compositions: 9 [2021-03-25 07:40:18,684 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 73 [2021-03-25 07:40:18,686 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 07:40:18,686 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,686 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,686 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:18,686 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,686 INFO L82 PathProgramCache]: Analyzing trace with hash 7971, now seen corresponding path program 1 times [2021-03-25 07:40:18,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,687 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867657030] [2021-03-25 07:40:18,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:18,695 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:18,695 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:18,697 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 07:40:18,698 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867657030] [2021-03-25 07:40:18,698 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:18,698 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:18,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613826486] [2021-03-25 07:40:18,698 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:18,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:18,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:18,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:18,699 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 41 [2021-03-25 07:40:18,699 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 07:40:18,699 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:18,699 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 41 [2021-03-25 07:40:18,699 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:18,911 INFO L129 PetriNetUnfolder]: 1793/2315 cut-off events. [2021-03-25 07:40:18,911 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,920 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 07:40:18,933 INFO L132 encePairwiseOnDemand]: 39/41 looper letters, 9 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2021-03-25 07:40:18,934 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 20 transitions, 177 flow [2021-03-25 07:40:18,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:18,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:18,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 71 transitions. [2021-03-25 07:40:18,936 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5772357723577236 [2021-03-25 07:40:18,936 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 71 transitions. [2021-03-25 07:40:18,936 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 71 transitions. [2021-03-25 07:40:18,936 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:18,936 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 71 transitions. [2021-03-25 07:40:18,937 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 07:40:18,938 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 07:40:18,939 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 07:40:18,939 INFO L185 Difference]: Start difference. First operand has 40 places, 21 transitions, 159 flow. Second operand 3 states and 71 transitions. [2021-03-25 07:40:18,939 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 20 transitions, 177 flow [2021-03-25 07:40:18,941 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 07:40:18,941 INFO L241 Difference]: Finished difference. Result has 41 places, 20 transitions, 87 flow [2021-03-25 07:40:18,942 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 07:40:18,942 INFO L343 CegarLoopForPetriNet]: 40 programPoint places, 1 predicate places. [2021-03-25 07:40:18,942 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:18,942 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 41 places, 20 transitions, 87 flow [2021-03-25 07:40:18,942 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 41 places, 20 transitions, 87 flow [2021-03-25 07:40:18,942 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 20 transitions, 87 flow [2021-03-25 07:40:18,945 INFO L129 PetriNetUnfolder]: 0/20 cut-off events. [2021-03-25 07:40:18,945 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:18,946 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 07:40:18,946 INFO L142 LiptonReduction]: Number of co-enabled transitions 162 [2021-03-25 07:40:18,947 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:18,947 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:18,947 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:18,948 INFO L480 AbstractCegarLoop]: Abstraction has has 41 places, 20 transitions, 87 flow [2021-03-25 07:40:18,948 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 07:40:18,948 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:18,948 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:18,948 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-03-25 07:40:18,948 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:18,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:18,949 INFO L82 PathProgramCache]: Analyzing trace with hash -607272555, now seen corresponding path program 1 times [2021-03-25 07:40:18,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:18,949 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460838109] [2021-03-25 07:40:18,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:18,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,963 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:18,965 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:18,967 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:18,967 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:18,967 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-03-25 07:40:18,967 WARN L342 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:18,968 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2021-03-25 07:40:18,997 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:18,997 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:18,998 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:18,998 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:18,998 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:18,998 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:18,998 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:18,998 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:18,998 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:18,998 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:18,999 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 56 places, 35 transitions, 210 flow [2021-03-25 07:40:19,003 INFO L129 PetriNetUnfolder]: 0/65 cut-off events. [2021-03-25 07:40:19,004 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:19,004 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 07:40:19,004 INFO L82 GeneralOperation]: Start removeDead. Operand has 56 places, 35 transitions, 210 flow [2021-03-25 07:40:19,004 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 54 places, 33 transitions, 206 flow [2021-03-25 07:40:19,004 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:19,005 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-25 07:40:19,005 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-25 07:40:19,005 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 54 places, 33 transitions, 206 flow [2021-03-25 07:40:19,008 INFO L129 PetriNetUnfolder]: 0/43 cut-off events. [2021-03-25 07:40:19,008 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:19,008 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 07:40:19,009 INFO L142 LiptonReduction]: Number of co-enabled transitions 620 [2021-03-25 07:40:19,075 INFO L154 LiptonReduction]: Checked pairs total: 490 [2021-03-25 07:40:19,075 INFO L156 LiptonReduction]: Total number of compositions: 10 [2021-03-25 07:40:19,075 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 71 [2021-03-25 07:40:19,077 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:40:19,077 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:19,077 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:19,077 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:19,077 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:19,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:19,078 INFO L82 PathProgramCache]: Analyzing trace with hash 9379, now seen corresponding path program 1 times [2021-03-25 07:40:19,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:19,078 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158486855] [2021-03-25 07:40:19,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:19,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:19,085 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:19,085 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:19,102 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 07:40:19,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158486855] [2021-03-25 07:40:19,103 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:19,103 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:19,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942428534] [2021-03-25 07:40:19,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:19,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:19,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:19,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:19,106 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 45 [2021-03-25 07:40:19,107 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 07:40:19,107 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:19,107 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 45 [2021-03-25 07:40:19,107 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:19,642 INFO L129 PetriNetUnfolder]: 4097/5132 cut-off events. [2021-03-25 07:40:19,642 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:19,673 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 07:40:19,704 INFO L132 encePairwiseOnDemand]: 43/45 looper letters, 10 selfloop transitions, 1 changer transitions 0/22 dead transitions. [2021-03-25 07:40:19,704 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 22 transitions, 206 flow [2021-03-25 07:40:19,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:19,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:19,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 78 transitions. [2021-03-25 07:40:19,705 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5777777777777777 [2021-03-25 07:40:19,705 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 78 transitions. [2021-03-25 07:40:19,705 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 78 transitions. [2021-03-25 07:40:19,705 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:19,705 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 78 transitions. [2021-03-25 07:40:19,706 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 07:40:19,706 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 07:40:19,706 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 07:40:19,706 INFO L185 Difference]: Start difference. First operand has 44 places, 23 transitions, 186 flow. Second operand 3 states and 78 transitions. [2021-03-25 07:40:19,706 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 22 transitions, 206 flow [2021-03-25 07:40:19,708 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 07:40:19,709 INFO L241 Difference]: Finished difference. Result has 45 places, 22 transitions, 96 flow [2021-03-25 07:40:19,709 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 07:40:19,709 INFO L343 CegarLoopForPetriNet]: 44 programPoint places, 1 predicate places. [2021-03-25 07:40:19,710 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:19,710 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 45 places, 22 transitions, 96 flow [2021-03-25 07:40:19,710 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 45 places, 22 transitions, 96 flow [2021-03-25 07:40:19,710 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 45 places, 22 transitions, 96 flow [2021-03-25 07:40:19,713 INFO L129 PetriNetUnfolder]: 0/22 cut-off events. [2021-03-25 07:40:19,713 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:19,713 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 07:40:19,713 INFO L142 LiptonReduction]: Number of co-enabled transitions 200 [2021-03-25 07:40:19,715 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:19,715 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:19,715 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:19,716 INFO L480 AbstractCegarLoop]: Abstraction has has 45 places, 22 transitions, 96 flow [2021-03-25 07:40:19,717 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 07:40:19,717 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:19,717 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:19,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-03-25 07:40:19,717 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:19,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:19,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1208304905, now seen corresponding path program 1 times [2021-03-25 07:40:19,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:19,718 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898646399] [2021-03-25 07:40:19,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:19,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:19,723 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:19,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:19,727 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:19,730 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:19,730 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:19,731 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-03-25 07:40:19,731 WARN L342 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:19,731 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2021-03-25 07:40:19,752 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:19,753 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:19,754 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:19,754 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:19,754 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:19,754 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:19,754 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:19,754 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:19,754 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:19,754 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:19,756 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 38 transitions, 241 flow [2021-03-25 07:40:19,762 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-25 07:40:19,762 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:19,762 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 07:40:19,763 INFO L82 GeneralOperation]: Start removeDead. Operand has 61 places, 38 transitions, 241 flow [2021-03-25 07:40:19,763 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 36 transitions, 237 flow [2021-03-25 07:40:19,763 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:19,764 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-25 07:40:19,764 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-25 07:40:19,764 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 59 places, 36 transitions, 237 flow [2021-03-25 07:40:19,767 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-25 07:40:19,767 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:19,768 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 07:40:19,768 INFO L142 LiptonReduction]: Number of co-enabled transitions 748 [2021-03-25 07:40:19,845 INFO L154 LiptonReduction]: Checked pairs total: 594 [2021-03-25 07:40:19,845 INFO L156 LiptonReduction]: Total number of compositions: 11 [2021-03-25 07:40:19,845 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 82 [2021-03-25 07:40:19,847 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 07:40:19,847 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:19,847 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:19,847 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:19,848 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:19,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:19,848 INFO L82 PathProgramCache]: Analyzing trace with hash 10915, now seen corresponding path program 1 times [2021-03-25 07:40:19,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:19,848 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189134318] [2021-03-25 07:40:19,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:19,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:19,858 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:19,859 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:19,861 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 07:40:19,861 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189134318] [2021-03-25 07:40:19,861 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:19,862 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:19,862 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411573808] [2021-03-25 07:40:19,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:19,862 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:19,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:19,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:19,863 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 49 [2021-03-25 07:40:19,863 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 07:40:19,863 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:19,863 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 49 [2021-03-25 07:40:19,863 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:20,944 INFO L129 PetriNetUnfolder]: 9217/11277 cut-off events. [2021-03-25 07:40:20,945 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:20,995 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 07:40:21,059 INFO L132 encePairwiseOnDemand]: 47/49 looper letters, 11 selfloop transitions, 1 changer transitions 0/24 dead transitions. [2021-03-25 07:40:21,059 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 24 transitions, 237 flow [2021-03-25 07:40:21,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:21,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:21,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 85 transitions. [2021-03-25 07:40:21,060 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5782312925170068 [2021-03-25 07:40:21,060 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 85 transitions. [2021-03-25 07:40:21,060 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 85 transitions. [2021-03-25 07:40:21,060 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:21,060 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 85 transitions. [2021-03-25 07:40:21,061 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 07:40:21,061 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 07:40:21,061 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 07:40:21,061 INFO L185 Difference]: Start difference. First operand has 48 places, 25 transitions, 215 flow. Second operand 3 states and 85 transitions. [2021-03-25 07:40:21,062 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 24 transitions, 237 flow [2021-03-25 07:40:21,063 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 07:40:21,063 INFO L241 Difference]: Finished difference. Result has 49 places, 24 transitions, 105 flow [2021-03-25 07:40:21,063 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 07:40:21,064 INFO L343 CegarLoopForPetriNet]: 48 programPoint places, 1 predicate places. [2021-03-25 07:40:21,064 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:21,064 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 24 transitions, 105 flow [2021-03-25 07:40:21,064 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 24 transitions, 105 flow [2021-03-25 07:40:21,064 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 24 transitions, 105 flow [2021-03-25 07:40:21,066 INFO L129 PetriNetUnfolder]: 0/24 cut-off events. [2021-03-25 07:40:21,067 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:21,067 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 07:40:21,067 INFO L142 LiptonReduction]: Number of co-enabled transitions 242 [2021-03-25 07:40:21,069 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:21,069 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:21,069 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:21,069 INFO L480 AbstractCegarLoop]: Abstraction has has 49 places, 24 transitions, 105 flow [2021-03-25 07:40:21,069 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 07:40:21,070 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:21,070 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:21,070 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-03-25 07:40:21,070 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:21,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:21,070 INFO L82 PathProgramCache]: Analyzing trace with hash 941462544, now seen corresponding path program 1 times [2021-03-25 07:40:21,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:21,070 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381913519] [2021-03-25 07:40:21,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:21,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:21,074 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:21,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:21,077 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:21,078 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:21,079 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:21,079 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-03-25 07:40:21,079 WARN L342 ceAbstractionStarter]: 11 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:21,079 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 12 thread instances. [2021-03-25 07:40:21,093 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:21,094 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:21,094 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:21,094 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:21,095 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:21,095 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:21,095 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:21,095 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:21,095 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:21,095 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:21,095 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 66 places, 41 transitions, 274 flow [2021-03-25 07:40:21,100 INFO L129 PetriNetUnfolder]: 0/77 cut-off events. [2021-03-25 07:40:21,101 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:21,101 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 07:40:21,101 INFO L82 GeneralOperation]: Start removeDead. Operand has 66 places, 41 transitions, 274 flow [2021-03-25 07:40:21,101 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 39 transitions, 270 flow [2021-03-25 07:40:21,102 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:21,102 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-25 07:40:21,102 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-25 07:40:21,102 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 64 places, 39 transitions, 270 flow [2021-03-25 07:40:21,106 INFO L129 PetriNetUnfolder]: 0/51 cut-off events. [2021-03-25 07:40:21,106 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:21,106 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 07:40:21,107 INFO L142 LiptonReduction]: Number of co-enabled transitions 888 [2021-03-25 07:40:21,222 INFO L154 LiptonReduction]: Checked pairs total: 708 [2021-03-25 07:40:21,223 INFO L156 LiptonReduction]: Total number of compositions: 12 [2021-03-25 07:40:21,223 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 121 [2021-03-25 07:40:21,223 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 07:40:21,223 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:21,224 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:21,224 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:21,224 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:21,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:21,224 INFO L82 PathProgramCache]: Analyzing trace with hash 12579, now seen corresponding path program 1 times [2021-03-25 07:40:21,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:21,224 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538160852] [2021-03-25 07:40:21,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:21,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:21,228 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:21,229 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:21,231 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 07:40:21,231 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538160852] [2021-03-25 07:40:21,231 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:21,231 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:21,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912721641] [2021-03-25 07:40:21,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:21,232 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:21,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:21,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:21,232 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 53 [2021-03-25 07:40:21,232 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 07:40:21,232 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:21,232 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 53 [2021-03-25 07:40:21,233 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:23,510 INFO L129 PetriNetUnfolder]: 20481/24590 cut-off events. [2021-03-25 07:40:23,511 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:23,708 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 07:40:23,923 INFO L132 encePairwiseOnDemand]: 51/53 looper letters, 12 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2021-03-25 07:40:23,923 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 26 transitions, 270 flow [2021-03-25 07:40:23,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:23,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:23,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 92 transitions. [2021-03-25 07:40:23,928 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5786163522012578 [2021-03-25 07:40:23,928 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 92 transitions. [2021-03-25 07:40:23,928 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 92 transitions. [2021-03-25 07:40:23,929 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:23,929 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 92 transitions. [2021-03-25 07:40:23,929 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 07:40:23,929 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 07:40:23,929 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 07:40:23,930 INFO L185 Difference]: Start difference. First operand has 52 places, 27 transitions, 246 flow. Second operand 3 states and 92 transitions. [2021-03-25 07:40:23,930 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 26 transitions, 270 flow [2021-03-25 07:40:23,931 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 07:40:23,932 INFO L241 Difference]: Finished difference. Result has 53 places, 26 transitions, 114 flow [2021-03-25 07:40:23,932 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 07:40:23,932 INFO L343 CegarLoopForPetriNet]: 52 programPoint places, 1 predicate places. [2021-03-25 07:40:23,932 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:23,932 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 53 places, 26 transitions, 114 flow [2021-03-25 07:40:23,933 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 53 places, 26 transitions, 114 flow [2021-03-25 07:40:23,933 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 53 places, 26 transitions, 114 flow [2021-03-25 07:40:23,935 INFO L129 PetriNetUnfolder]: 0/26 cut-off events. [2021-03-25 07:40:23,935 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:23,936 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 07:40:23,936 INFO L142 LiptonReduction]: Number of co-enabled transitions 288 [2021-03-25 07:40:23,937 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:23,937 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:23,937 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:23,938 INFO L480 AbstractCegarLoop]: Abstraction has has 53 places, 26 transitions, 114 flow [2021-03-25 07:40:23,938 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 07:40:23,938 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:23,938 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:23,938 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-03-25 07:40:23,938 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:23,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:23,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1127292090, now seen corresponding path program 1 times [2021-03-25 07:40:23,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:23,939 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598333872] [2021-03-25 07:40:23,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:23,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:23,952 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:23,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:23,957 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:23,962 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:23,963 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:23,963 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-03-25 07:40:23,963 WARN L342 ceAbstractionStarter]: 12 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:23,963 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 13 thread instances. [2021-03-25 07:40:23,982 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:23,982 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:23,983 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:23,983 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:23,983 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:23,983 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:23,983 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:23,983 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:23,983 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:23,983 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:23,984 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 71 places, 44 transitions, 309 flow [2021-03-25 07:40:23,988 INFO L129 PetriNetUnfolder]: 0/83 cut-off events. [2021-03-25 07:40:23,989 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:23,989 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 07:40:23,989 INFO L82 GeneralOperation]: Start removeDead. Operand has 71 places, 44 transitions, 309 flow [2021-03-25 07:40:23,989 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 69 places, 42 transitions, 305 flow [2021-03-25 07:40:23,989 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:23,989 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-25 07:40:23,990 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-25 07:40:23,990 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 69 places, 42 transitions, 305 flow [2021-03-25 07:40:23,993 INFO L129 PetriNetUnfolder]: 0/55 cut-off events. [2021-03-25 07:40:23,993 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:23,993 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 07:40:23,994 INFO L142 LiptonReduction]: Number of co-enabled transitions 1040 [2021-03-25 07:40:24,088 INFO L154 LiptonReduction]: Checked pairs total: 832 [2021-03-25 07:40:24,088 INFO L156 LiptonReduction]: Total number of compositions: 13 [2021-03-25 07:40:24,089 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 100 [2021-03-25 07:40:24,090 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:40:24,090 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:24,090 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:24,090 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:24,090 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:24,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:24,091 INFO L82 PathProgramCache]: Analyzing trace with hash 14371, now seen corresponding path program 1 times [2021-03-25 07:40:24,091 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:24,091 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386947358] [2021-03-25 07:40:24,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:24,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:24,098 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:24,099 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:24,101 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 07:40:24,101 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386947358] [2021-03-25 07:40:24,101 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:24,101 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:24,102 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954711584] [2021-03-25 07:40:24,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:24,102 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:24,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:24,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:24,103 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 57 [2021-03-25 07:40:24,103 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 07:40:24,103 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:24,103 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 57 [2021-03-25 07:40:24,103 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:28,393 INFO L129 PetriNetUnfolder]: 45057/53263 cut-off events. [2021-03-25 07:40:28,393 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:28,818 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 07:40:29,041 INFO L132 encePairwiseOnDemand]: 55/57 looper letters, 13 selfloop transitions, 1 changer transitions 0/28 dead transitions. [2021-03-25 07:40:29,041 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 28 transitions, 305 flow [2021-03-25 07:40:29,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:29,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:29,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2021-03-25 07:40:29,043 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5789473684210527 [2021-03-25 07:40:29,043 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 99 transitions. [2021-03-25 07:40:29,043 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 99 transitions. [2021-03-25 07:40:29,043 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:29,043 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 99 transitions. [2021-03-25 07:40:29,043 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 07:40:29,044 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 07:40:29,044 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 07:40:29,044 INFO L185 Difference]: Start difference. First operand has 56 places, 29 transitions, 279 flow. Second operand 3 states and 99 transitions. [2021-03-25 07:40:29,044 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 28 transitions, 305 flow [2021-03-25 07:40:29,047 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 07:40:29,048 INFO L241 Difference]: Finished difference. Result has 57 places, 28 transitions, 123 flow [2021-03-25 07:40:29,048 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 07:40:29,048 INFO L343 CegarLoopForPetriNet]: 56 programPoint places, 1 predicate places. [2021-03-25 07:40:29,048 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:29,049 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 57 places, 28 transitions, 123 flow [2021-03-25 07:40:29,049 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 57 places, 28 transitions, 123 flow [2021-03-25 07:40:29,049 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 57 places, 28 transitions, 123 flow [2021-03-25 07:40:29,053 INFO L129 PetriNetUnfolder]: 0/28 cut-off events. [2021-03-25 07:40:29,053 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:29,053 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 07:40:29,055 INFO L142 LiptonReduction]: Number of co-enabled transitions 338 [2021-03-25 07:40:29,057 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:29,057 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:29,057 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 9 [2021-03-25 07:40:29,057 INFO L480 AbstractCegarLoop]: Abstraction has has 57 places, 28 transitions, 123 flow [2021-03-25 07:40:29,057 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 07:40:29,058 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:29,058 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:29,058 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-03-25 07:40:29,058 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:29,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:29,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1451810459, now seen corresponding path program 1 times [2021-03-25 07:40:29,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:29,058 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643141187] [2021-03-25 07:40:29,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:29,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:29,070 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:29,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:29,077 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:29,079 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:29,079 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:29,079 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-03-25 07:40:29,079 WARN L342 ceAbstractionStarter]: 13 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:29,079 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 14 thread instances. [2021-03-25 07:40:29,101 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:29,102 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:29,103 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:29,103 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:29,103 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:29,103 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:29,103 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:29,103 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:29,103 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:29,104 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:29,105 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 76 places, 47 transitions, 346 flow [2021-03-25 07:40:29,110 INFO L129 PetriNetUnfolder]: 0/89 cut-off events. [2021-03-25 07:40:29,110 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:29,110 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 07:40:29,110 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 47 transitions, 346 flow [2021-03-25 07:40:29,111 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 74 places, 45 transitions, 342 flow [2021-03-25 07:40:29,111 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:29,111 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-25 07:40:29,111 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-25 07:40:29,111 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 74 places, 45 transitions, 342 flow [2021-03-25 07:40:29,116 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-25 07:40:29,116 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:29,116 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 07:40:29,118 INFO L142 LiptonReduction]: Number of co-enabled transitions 1204 [2021-03-25 07:40:29,200 INFO L154 LiptonReduction]: Checked pairs total: 966 [2021-03-25 07:40:29,200 INFO L156 LiptonReduction]: Total number of compositions: 14 [2021-03-25 07:40:29,200 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 89 [2021-03-25 07:40:29,201 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 07:40:29,201 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:29,201 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:29,202 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:29,202 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:29,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:29,202 INFO L82 PathProgramCache]: Analyzing trace with hash 16291, now seen corresponding path program 1 times [2021-03-25 07:40:29,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:29,202 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697157718] [2021-03-25 07:40:29,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:29,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:29,209 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:29,209 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:29,212 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 07:40:29,212 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697157718] [2021-03-25 07:40:29,212 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:29,212 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:29,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992864635] [2021-03-25 07:40:29,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:29,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:29,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:29,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:29,213 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 61 [2021-03-25 07:40:29,214 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 07:40:29,214 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:29,214 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 61 [2021-03-25 07:40:29,214 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:40:39,528 INFO L129 PetriNetUnfolder]: 98305/114704 cut-off events. [2021-03-25 07:40:39,528 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:40,690 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 07:40:41,452 INFO L132 encePairwiseOnDemand]: 59/61 looper letters, 14 selfloop transitions, 1 changer transitions 0/30 dead transitions. [2021-03-25 07:40:41,453 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 30 transitions, 342 flow [2021-03-25 07:40:41,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:40:41,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:40:41,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 106 transitions. [2021-03-25 07:40:41,454 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5792349726775956 [2021-03-25 07:40:41,454 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 106 transitions. [2021-03-25 07:40:41,454 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 106 transitions. [2021-03-25 07:40:41,454 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:40:41,454 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 106 transitions. [2021-03-25 07:40:41,454 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 07:40:41,455 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 07:40:41,455 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 07:40:41,455 INFO L185 Difference]: Start difference. First operand has 60 places, 31 transitions, 314 flow. Second operand 3 states and 106 transitions. [2021-03-25 07:40:41,455 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 30 transitions, 342 flow [2021-03-25 07:40:41,457 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 07:40:41,458 INFO L241 Difference]: Finished difference. Result has 61 places, 30 transitions, 132 flow [2021-03-25 07:40:41,458 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 07:40:41,458 INFO L343 CegarLoopForPetriNet]: 60 programPoint places, 1 predicate places. [2021-03-25 07:40:41,458 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:41,458 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 61 places, 30 transitions, 132 flow [2021-03-25 07:40:41,458 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 61 places, 30 transitions, 132 flow [2021-03-25 07:40:41,459 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 30 transitions, 132 flow [2021-03-25 07:40:41,461 INFO L129 PetriNetUnfolder]: 0/30 cut-off events. [2021-03-25 07:40:41,461 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:41,461 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 07:40:41,461 INFO L142 LiptonReduction]: Number of co-enabled transitions 392 [2021-03-25 07:40:41,463 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:40:41,463 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:40:41,463 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:40:41,464 INFO L480 AbstractCegarLoop]: Abstraction has has 61 places, 30 transitions, 132 flow [2021-03-25 07:40:41,464 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 07:40:41,464 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:41,464 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-25 07:40:41,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-03-25 07:40:41,464 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:41,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:41,464 INFO L82 PathProgramCache]: Analyzing trace with hash -138593667, now seen corresponding path program 1 times [2021-03-25 07:40:41,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:41,465 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436380621] [2021-03-25 07:40:41,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:41,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:41,468 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:41,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:40:41,470 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:40:41,472 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:40:41,472 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:40:41,472 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-03-25 07:40:41,472 WARN L342 ceAbstractionStarter]: 14 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:40:41,472 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 15 thread instances. [2021-03-25 07:40:41,489 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:40:41,490 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:40:41,491 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:40:41,491 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:40:41,491 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:40:41,491 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:40:41,491 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:40:41,491 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:40:41,491 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:40:41,491 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:40:41,492 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 81 places, 50 transitions, 385 flow [2021-03-25 07:40:41,497 INFO L129 PetriNetUnfolder]: 0/95 cut-off events. [2021-03-25 07:40:41,498 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:41,498 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 07:40:41,498 INFO L82 GeneralOperation]: Start removeDead. Operand has 81 places, 50 transitions, 385 flow [2021-03-25 07:40:41,498 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 79 places, 48 transitions, 381 flow [2021-03-25 07:40:41,499 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:40:41,499 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-25 07:40:41,499 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-25 07:40:41,499 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 79 places, 48 transitions, 381 flow [2021-03-25 07:40:41,503 INFO L129 PetriNetUnfolder]: 0/63 cut-off events. [2021-03-25 07:40:41,504 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:41,504 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 07:40:41,505 INFO L142 LiptonReduction]: Number of co-enabled transitions 1380 [2021-03-25 07:40:41,586 INFO L154 LiptonReduction]: Checked pairs total: 1110 [2021-03-25 07:40:41,586 INFO L156 LiptonReduction]: Total number of compositions: 15 [2021-03-25 07:40:41,587 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 88 [2021-03-25 07:40:41,587 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 07:40:41,587 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:40:41,587 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:40:41,587 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:40:41,588 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:40:41,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:40:41,588 INFO L82 PathProgramCache]: Analyzing trace with hash 18339, now seen corresponding path program 1 times [2021-03-25 07:40:41,588 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:40:41,588 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612741308] [2021-03-25 07:40:41,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:40:41,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:40:41,601 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:40:41,602 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:40:41,604 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 07:40:41,604 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612741308] [2021-03-25 07:40:41,604 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:40:41,604 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:40:41,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50673852] [2021-03-25 07:40:41,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:40:41,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:40:41,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:40:41,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:40:41,605 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 65 [2021-03-25 07:40:41,605 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 07:40:41,605 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:40:41,605 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 65 [2021-03-25 07:40:41,606 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:41:14,269 INFO L129 PetriNetUnfolder]: 212993/245777 cut-off events. [2021-03-25 07:41:14,269 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:41:17,087 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 07:41:18,155 INFO L132 encePairwiseOnDemand]: 63/65 looper letters, 15 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2021-03-25 07:41:18,155 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 32 transitions, 381 flow [2021-03-25 07:41:18,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:41:18,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:41:18,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 113 transitions. [2021-03-25 07:41:18,156 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5794871794871795 [2021-03-25 07:41:18,157 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 113 transitions. [2021-03-25 07:41:18,157 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 113 transitions. [2021-03-25 07:41:18,157 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:41:18,157 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 113 transitions. [2021-03-25 07:41:18,157 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 07:41:18,158 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 07:41:18,158 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 07:41:18,158 INFO L185 Difference]: Start difference. First operand has 64 places, 33 transitions, 351 flow. Second operand 3 states and 113 transitions. [2021-03-25 07:41:18,158 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 32 transitions, 381 flow [2021-03-25 07:41:18,160 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 07:41:18,160 INFO L241 Difference]: Finished difference. Result has 65 places, 32 transitions, 141 flow [2021-03-25 07:41:18,161 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 07:41:18,161 INFO L343 CegarLoopForPetriNet]: 64 programPoint places, 1 predicate places. [2021-03-25 07:41:18,161 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:41:18,161 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 65 places, 32 transitions, 141 flow [2021-03-25 07:41:18,161 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 65 places, 32 transitions, 141 flow [2021-03-25 07:41:18,161 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 65 places, 32 transitions, 141 flow [2021-03-25 07:41:18,163 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-25 07:41:18,163 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:41:18,163 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 07:41:18,164 INFO L142 LiptonReduction]: Number of co-enabled transitions 450 [2021-03-25 07:41:18,166 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:41:18,166 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:41:18,166 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-25 07:41:18,167 INFO L480 AbstractCegarLoop]: Abstraction has has 65 places, 32 transitions, 141 flow [2021-03-25 07:41:18,167 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 07:41:18,167 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:41:18,167 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 07:41:18,167 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-03-25 07:41:18,167 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:41:18,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:41:18,167 INFO L82 PathProgramCache]: Analyzing trace with hash -1465640138, now seen corresponding path program 1 times [2021-03-25 07:41:18,167 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:41:18,167 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090205256] [2021-03-25 07:41:18,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:41:18,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:41:18,171 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:41:18,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:41:18,173 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:41:18,180 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:41:18,181 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:41:18,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-03-25 07:41:18,181 WARN L342 ceAbstractionStarter]: 15 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:41:18,181 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 16 thread instances. [2021-03-25 07:41:18,203 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:41:18,204 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:41:18,205 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:41:18,205 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:41:18,205 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:41:18,205 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:41:18,205 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:41:18,205 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:41:18,205 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:41:18,205 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:41:18,206 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 86 places, 53 transitions, 426 flow [2021-03-25 07:41:18,212 INFO L129 PetriNetUnfolder]: 0/101 cut-off events. [2021-03-25 07:41:18,212 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:41:18,212 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 07:41:18,212 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 53 transitions, 426 flow [2021-03-25 07:41:18,212 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 84 places, 51 transitions, 422 flow [2021-03-25 07:41:18,212 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:41:18,212 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-25 07:41:18,213 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-25 07:41:18,213 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 84 places, 51 transitions, 422 flow [2021-03-25 07:41:18,217 INFO L129 PetriNetUnfolder]: 0/67 cut-off events. [2021-03-25 07:41:18,217 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:41:18,217 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 07:41:18,218 INFO L142 LiptonReduction]: Number of co-enabled transitions 1568 [2021-03-25 07:41:18,332 INFO L154 LiptonReduction]: Checked pairs total: 1264 [2021-03-25 07:41:18,332 INFO L156 LiptonReduction]: Total number of compositions: 16 [2021-03-25 07:41:18,332 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 120 [2021-03-25 07:41:18,333 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-25 07:41:18,333 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:41:18,333 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:41:18,333 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:41:18,333 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:41:18,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:41:18,333 INFO L82 PathProgramCache]: Analyzing trace with hash 20515, now seen corresponding path program 1 times [2021-03-25 07:41:18,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:41:18,333 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442846343] [2021-03-25 07:41:18,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:41:18,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:41:18,358 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:41:18,359 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:41:18,361 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 07:41:18,361 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442846343] [2021-03-25 07:41:18,361 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:41:18,361 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:41:18,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678181378] [2021-03-25 07:41:18,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:41:18,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:41:18,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:41:18,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:41:18,362 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 34 out of 69 [2021-03-25 07:41:18,362 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 07:41:18,362 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:41:18,362 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 34 of 69 [2021-03-25 07:41:18,362 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-25 07:42:50,719 INFO L129 PetriNetUnfolder]: 458753/524306 cut-off events. [2021-03-25 07:42:50,719 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:42:57,335 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 07:42:59,142 INFO L132 encePairwiseOnDemand]: 67/69 looper letters, 16 selfloop transitions, 1 changer transitions 0/34 dead transitions. [2021-03-25 07:42:59,142 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 34 transitions, 422 flow [2021-03-25 07:42:59,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-25 07:42:59,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-25 07:42:59,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 120 transitions. [2021-03-25 07:42:59,143 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5797101449275363 [2021-03-25 07:42:59,143 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 120 transitions. [2021-03-25 07:42:59,143 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 120 transitions. [2021-03-25 07:42:59,143 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-25 07:42:59,143 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 120 transitions. [2021-03-25 07:42:59,144 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 07:42:59,144 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 07:42:59,144 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 07:42:59,144 INFO L185 Difference]: Start difference. First operand has 68 places, 35 transitions, 390 flow. Second operand 3 states and 120 transitions. [2021-03-25 07:42:59,144 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 34 transitions, 422 flow [2021-03-25 07:42:59,147 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 07:42:59,147 INFO L241 Difference]: Finished difference. Result has 69 places, 34 transitions, 150 flow [2021-03-25 07:42:59,147 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 07:42:59,147 INFO L343 CegarLoopForPetriNet]: 68 programPoint places, 1 predicate places. [2021-03-25 07:42:59,147 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:42:59,148 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 69 places, 34 transitions, 150 flow [2021-03-25 07:42:59,148 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 69 places, 34 transitions, 150 flow [2021-03-25 07:42:59,148 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 69 places, 34 transitions, 150 flow [2021-03-25 07:42:59,150 INFO L129 PetriNetUnfolder]: 0/34 cut-off events. [2021-03-25 07:42:59,150 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:42:59,150 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 07:42:59,151 INFO L142 LiptonReduction]: Number of co-enabled transitions 512 [2021-03-25 07:42:59,153 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 07:42:59,153 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 07:42:59,153 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-03-25 07:42:59,153 INFO L480 AbstractCegarLoop]: Abstraction has has 69 places, 34 transitions, 150 flow [2021-03-25 07:42:59,153 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 07:42:59,154 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:42:59,154 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 07:42:59,154 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-03-25 07:42:59,154 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:42:59,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:42:59,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1833507392, now seen corresponding path program 1 times [2021-03-25 07:42:59,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:42:59,154 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237862129] [2021-03-25 07:42:59,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:42:59,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:42:59,162 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:42:59,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 07:42:59,163 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 07:42:59,165 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 07:42:59,165 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 07:42:59,165 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-03-25 07:42:59,165 WARN L342 ceAbstractionStarter]: 16 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-25 07:42:59,165 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 17 thread instances. [2021-03-25 07:42:59,186 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-25 07:42:59,187 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-25 07:42:59,187 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 07:42:59,187 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 07:42:59,187 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 07:42:59,187 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 07:42:59,187 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 07:42:59,188 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 07:42:59,188 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 07:42:59,188 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 07:42:59,188 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 91 places, 56 transitions, 469 flow [2021-03-25 07:42:59,194 INFO L129 PetriNetUnfolder]: 0/107 cut-off events. [2021-03-25 07:42:59,194 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:42:59,194 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 07:42:59,195 INFO L82 GeneralOperation]: Start removeDead. Operand has 91 places, 56 transitions, 469 flow [2021-03-25 07:42:59,195 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 89 places, 54 transitions, 465 flow [2021-03-25 07:42:59,195 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-25 07:42:59,195 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-25 07:42:59,195 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-25 07:42:59,196 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 89 places, 54 transitions, 465 flow [2021-03-25 07:42:59,200 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-25 07:42:59,200 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:42:59,200 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 07:42:59,202 INFO L142 LiptonReduction]: Number of co-enabled transitions 1768 [2021-03-25 07:42:59,296 INFO L154 LiptonReduction]: Checked pairs total: 1428 [2021-03-25 07:42:59,296 INFO L156 LiptonReduction]: Total number of compositions: 17 [2021-03-25 07:42:59,296 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 101 [2021-03-25 07:42:59,297 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-25 07:42:59,297 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-25 07:42:59,297 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 07:42:59,297 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-25 07:42:59,297 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 07:42:59,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 07:42:59,297 INFO L82 PathProgramCache]: Analyzing trace with hash 22819, now seen corresponding path program 1 times [2021-03-25 07:42:59,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 07:42:59,297 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115208751] [2021-03-25 07:42:59,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 07:42:59,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-25 07:42:59,302 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-25 07:42:59,303 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-25 07:42:59,305 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 07:42:59,305 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115208751] [2021-03-25 07:42:59,305 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-25 07:42:59,305 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-25 07:42:59,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130914601] [2021-03-25 07:42:59,305 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-25 07:42:59,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-25 07:42:59,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-25 07:42:59,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-25 07:42:59,306 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 73 [2021-03-25 07:42:59,306 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 07:42:59,306 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-25 07:42:59,307 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 73 [2021-03-25 07:42:59,307 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand