/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-RepeatedSemanticLbeWithPredicates.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-6f4246e9f5583d222ebb38ff8175c901f3a528f0-6f4246e [2021-04-29 03:41:17,013 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-04-29 03:41:17,017 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-04-29 03:41:17,072 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-04-29 03:41:17,073 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-04-29 03:41:17,077 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-04-29 03:41:17,080 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-04-29 03:41:17,087 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-04-29 03:41:17,090 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-04-29 03:41:17,096 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-04-29 03:41:17,097 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-04-29 03:41:17,098 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-04-29 03:41:17,099 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-04-29 03:41:17,101 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-04-29 03:41:17,103 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-04-29 03:41:17,105 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-04-29 03:41:17,108 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-04-29 03:41:17,109 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-04-29 03:41:17,117 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-04-29 03:41:17,123 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-04-29 03:41:17,126 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-04-29 03:41:17,128 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-04-29 03:41:17,130 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-04-29 03:41:17,133 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-04-29 03:41:17,145 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-04-29 03:41:17,158 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-RepeatedSemanticLbeWithPredicates.epf [2021-04-29 03:41:17,202 INFO L113 SettingsManager]: Loading preferences was successful [2021-04-29 03:41:17,202 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-04-29 03:41:17,203 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-04-29 03:41:17,204 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-04-29 03:41:17,204 INFO L138 SettingsManager]: * Use SBE=true [2021-04-29 03:41:17,204 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-04-29 03:41:17,205 INFO L138 SettingsManager]: * sizeof long=4 [2021-04-29 03:41:17,205 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-04-29 03:41:17,205 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-04-29 03:41:17,205 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-04-29 03:41:17,205 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-04-29 03:41:17,206 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-04-29 03:41:17,206 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-04-29 03:41:17,206 INFO L138 SettingsManager]: * sizeof long double=12 [2021-04-29 03:41:17,206 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-04-29 03:41:17,207 INFO L138 SettingsManager]: * Use constant arrays=true [2021-04-29 03:41:17,207 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-04-29 03:41:17,207 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-04-29 03:41:17,207 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-04-29 03:41:17,207 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-04-29 03:41:17,208 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-04-29 03:41:17,208 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-04-29 03:41:17,208 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-04-29 03:41:17,208 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-04-29 03:41:17,208 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-04-29 03:41:17,209 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-04-29 03:41:17,209 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-04-29 03:41:17,209 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=SEMANTIC_BASED_MOVER_CHECK_WITH_PREDICATES [2021-04-29 03:41:17,209 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-04-29 03:41:17,209 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-04-29 03:41:17,210 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-04-29 03:41:17,631 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-04-29 03:41:17,664 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-04-29 03:41:17,667 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-04-29 03:41:17,669 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-04-29 03:41:17,670 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-04-29 03:41:17,671 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl [2021-04-29 03:41:17,673 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl' [2021-04-29 03:41:17,705 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-04-29 03:41:17,763 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-04-29 03:41:17,764 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-04-29 03:41:17,764 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-04-29 03:41:17,765 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-04-29 03:41:17,782 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 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,790 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 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,799 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-04-29 03:41:17,801 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-04-29 03:41:17,801 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-04-29 03:41:17,801 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-04-29 03:41:17,811 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,811 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,812 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,812 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,814 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,817 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,818 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (1/1) ... [2021-04-29 03:41:17,819 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-04-29 03:41:17,820 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-04-29 03:41:17,820 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-04-29 03:41:17,820 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-04-29 03:41:17,822 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (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 [2021-04-29 03:41:17,921 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-04-29 03:41:17,946 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-04-29 03:41:17,947 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-04-29 03:41:17,947 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-04-29 03:41:17,947 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-04-29 03:41:17,947 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-04-29 03:41:17,950 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-04-29 03:41:18,092 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-04-29 03:41:18,092 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-04-29 03:41:18,094 INFO L202 PluginConnector]: Adding new model fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.04 03:41:18 BoogieIcfgContainer [2021-04-29 03:41:18,094 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-04-29 03:41:18,096 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-04-29 03:41:18,097 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-04-29 03:41:18,101 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-04-29 03:41:18,101 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 29.04 03:41:17" (1/2) ... [2021-04-29 03:41:18,102 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ae0136d and model type fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.04 03:41:18, skipping insertion in model container [2021-04-29 03:41:18,102 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.04 03:41:18" (2/2) ... [2021-04-29 03:41:18,104 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_inc.bpl [2021-04-29 03:41:18,111 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-04-29 03:41:18,115 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-04-29 03:41:18,116 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-04-29 03:41:18,143 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:18,166 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:18,194 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:18,194 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:18,195 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:18,195 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:18,195 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:18,195 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:18,195 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:18,195 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:18,209 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 8 transitions, 21 flow [2021-04-29 03:41:18,226 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-04-29 03:41:18,226 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:18,228 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. [2021-04-29 03:41:18,228 INFO L82 GeneralOperation]: Start removeDead. Operand has 11 places, 8 transitions, 21 flow [2021-04-29 03:41:18,232 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 9 places, 6 transitions, 17 flow [2021-04-29 03:41:18,234 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:18,250 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 6 transitions, 17 flow [2021-04-29 03:41:18,254 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 6 transitions, 17 flow [2021-04-29 03:41:18,254 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 6 transitions, 17 flow [2021-04-29 03:41:18,258 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-04-29 03:41:18,258 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:18,258 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. [2021-04-29 03:41:18,260 INFO L146 LiptonReduction]: Number of co-enabled transitions 8 [2021-04-29 03:41:18,297 INFO L158 LiptonReduction]: Checked pairs total: 2 [2021-04-29 03:41:18,297 INFO L160 LiptonReduction]: Total number of compositions: 1 [2021-04-29 03:41:18,300 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 67 [2021-04-29 03:41:18,313 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-04-29 03:41:18,313 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:18,314 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:18,314 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:18,315 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:18,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:18,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1315, now seen corresponding path program 1 times [2021-04-29 03:41:18,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:18,332 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190330997] [2021-04-29 03:41:18,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:18,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:18,464 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:18,466 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:18,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:18,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190330997] [2021-04-29 03:41:18,477 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:18,478 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:18,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086761905] [2021-04-29 03:41:18,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:18,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:18,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:18,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:18,535 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 9 [2021-04-29 03:41:18,539 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 9 places, 6 transitions, 17 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) [2021-04-29 03:41:18,540 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:18,540 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 9 [2021-04-29 03:41:18,542 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:18,594 INFO L129 PetriNetUnfolder]: 0/5 cut-off events. [2021-04-29 03:41:18,595 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:18,595 INFO L84 FinitePrefix]: Finished finitePrefix Result has 14 conditions, 5 events. 0/5 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 3 event pairs, 0 based on Foata normal form. 4/8 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-04-29 03:41:18,599 INFO L132 encePairwiseOnDemand]: 7/9 looper letters, 2 selfloop transitions, 1 changer transitions 0/5 dead transitions. [2021-04-29 03:41:18,600 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 10 places, 5 transitions, 21 flow [2021-04-29 03:41:18,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:18,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:18,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 16 transitions. [2021-04-29 03:41:18,641 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5925925925925926 [2021-04-29 03:41:18,645 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 16 transitions. [2021-04-29 03:41:18,646 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 16 transitions. [2021-04-29 03:41:18,647 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:18,652 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 16 transitions. [2021-04-29 03:41:18,659 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-04-29 03:41:18,670 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) [2021-04-29 03:41:18,670 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) [2021-04-29 03:41:18,676 INFO L185 Difference]: Start difference. First operand has 9 places, 6 transitions, 17 flow. Second operand 3 states and 16 transitions. [2021-04-29 03:41:18,680 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 10 places, 5 transitions, 21 flow [2021-04-29 03:41:18,701 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 10 places, 5 transitions, 21 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:18,707 INFO L241 Difference]: Finished difference. Result has 10 places, 5 transitions, 17 flow [2021-04-29 03:41:18,713 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=9, PETRI_DIFFERENCE_MINUEND_FLOW=15, PETRI_DIFFERENCE_MINUEND_PLACES=8, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=5, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=4, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=17, PETRI_PLACES=10, PETRI_TRANSITIONS=5} [2021-04-29 03:41:18,715 INFO L343 CegarLoopForPetriNet]: 9 programPoint places, 1 predicate places. [2021-04-29 03:41:18,715 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:18,716 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 10 places, 5 transitions, 17 flow [2021-04-29 03:41:18,716 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 10 places, 5 transitions, 17 flow [2021-04-29 03:41:18,717 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 10 places, 5 transitions, 17 flow [2021-04-29 03:41:18,728 INFO L129 PetriNetUnfolder]: 0/5 cut-off events. [2021-04-29 03:41:18,729 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:18,729 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12 conditions, 5 events. 0/5 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 3 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. [2021-04-29 03:41:18,730 INFO L146 LiptonReduction]: Number of co-enabled transitions 4 [2021-04-29 03:41:18,734 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:18,734 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:18,735 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 20 [2021-04-29 03:41:18,740 INFO L480 AbstractCegarLoop]: Abstraction has has 10 places, 5 transitions, 17 flow [2021-04-29 03:41:18,740 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) [2021-04-29 03:41:18,741 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:18,741 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-04-29 03:41:18,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-04-29 03:41:18,745 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:18,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:18,746 INFO L82 PathProgramCache]: Analyzing trace with hash 41033, now seen corresponding path program 1 times [2021-04-29 03:41:18,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:18,749 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488068121] [2021-04-29 03:41:18,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:18,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:18,762 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:18,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:18,765 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:18,821 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:18,822 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:18,826 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-04-29 03:41:18,828 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:18,828 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-04-29 03:41:18,848 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:18,849 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:18,862 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:18,863 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:18,863 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:18,863 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:18,863 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:18,864 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:18,864 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:18,864 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:18,866 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 16 places, 11 transitions, 34 flow [2021-04-29 03:41:18,880 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-04-29 03:41:18,880 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:18,880 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. [2021-04-29 03:41:18,881 INFO L82 GeneralOperation]: Start removeDead. Operand has 16 places, 11 transitions, 34 flow [2021-04-29 03:41:18,884 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 9 transitions, 30 flow [2021-04-29 03:41:18,884 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:18,884 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 14 places, 9 transitions, 30 flow [2021-04-29 03:41:18,886 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 14 places, 9 transitions, 30 flow [2021-04-29 03:41:18,887 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 14 places, 9 transitions, 30 flow [2021-04-29 03:41:18,896 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-04-29 03:41:18,900 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:18,901 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. [2021-04-29 03:41:18,904 INFO L146 LiptonReduction]: Number of co-enabled transitions 28 [2021-04-29 03:41:19,031 INFO L158 LiptonReduction]: Checked pairs total: 9 [2021-04-29 03:41:19,031 INFO L160 LiptonReduction]: Total number of compositions: 2 [2021-04-29 03:41:19,031 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 147 [2021-04-29 03:41:19,041 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-04-29 03:41:19,045 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,046 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:19,046 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:19,047 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:19,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:19,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1699, now seen corresponding path program 1 times [2021-04-29 03:41:19,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:19,049 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421980054] [2021-04-29 03:41:19,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:19,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:19,069 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:19,070 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:19,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:19,085 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421980054] [2021-04-29 03:41:19,086 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:19,087 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:19,087 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094936241] [2021-04-29 03:41:19,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:19,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:19,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:19,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:19,107 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 13 [2021-04-29 03:41:19,107 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 14 places, 9 transitions, 30 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) [2021-04-29 03:41:19,108 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:19,108 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 13 [2021-04-29 03:41:19,110 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:19,151 INFO L129 PetriNetUnfolder]: 4/16 cut-off events. [2021-04-29 03:41:19,151 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,153 INFO L84 FinitePrefix]: Finished finitePrefix Result has 40 conditions, 16 events. 4/16 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 35 event pairs, 4 based on Foata normal form. 11/19 useless extension candidates. Maximal degree in co-relation 24. Up to 13 conditions per place. [2021-04-29 03:41:19,153 INFO L132 encePairwiseOnDemand]: 11/13 looper letters, 4 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2021-04-29 03:41:19,153 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 15 places, 8 transitions, 38 flow [2021-04-29 03:41:19,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:19,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:19,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 24 transitions. [2021-04-29 03:41:19,157 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6153846153846154 [2021-04-29 03:41:19,157 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 24 transitions. [2021-04-29 03:41:19,157 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 24 transitions. [2021-04-29 03:41:19,158 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:19,158 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 24 transitions. [2021-04-29 03:41:19,158 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-04-29 03:41:19,160 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) [2021-04-29 03:41:19,160 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) [2021-04-29 03:41:19,161 INFO L185 Difference]: Start difference. First operand has 14 places, 9 transitions, 30 flow. Second operand 3 states and 24 transitions. [2021-04-29 03:41:19,161 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 15 places, 8 transitions, 38 flow [2021-04-29 03:41:19,164 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 15 places, 8 transitions, 36 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:19,165 INFO L241 Difference]: Finished difference. Result has 15 places, 8 transitions, 28 flow [2021-04-29 03:41:19,165 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=13, PETRI_DIFFERENCE_MINUEND_FLOW=26, PETRI_DIFFERENCE_MINUEND_PLACES=13, 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=28, PETRI_PLACES=15, PETRI_TRANSITIONS=8} [2021-04-29 03:41:19,166 INFO L343 CegarLoopForPetriNet]: 14 programPoint places, 1 predicate places. [2021-04-29 03:41:19,166 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:19,166 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 15 places, 8 transitions, 28 flow [2021-04-29 03:41:19,168 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 15 places, 8 transitions, 28 flow [2021-04-29 03:41:19,169 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 15 places, 8 transitions, 28 flow [2021-04-29 03:41:19,182 INFO L129 PetriNetUnfolder]: 0/8 cut-off events. [2021-04-29 03:41:19,183 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,183 INFO L84 FinitePrefix]: Finished finitePrefix Result has 19 conditions, 8 events. 0/8 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 6 event pairs, 0 based on Foata normal form. 0/6 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-04-29 03:41:19,183 INFO L146 LiptonReduction]: Number of co-enabled transitions 20 [2021-04-29 03:41:19,185 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:19,185 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:19,185 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 19 [2021-04-29 03:41:19,188 INFO L480 AbstractCegarLoop]: Abstraction has has 15 places, 8 transitions, 28 flow [2021-04-29 03:41:19,189 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) [2021-04-29 03:41:19,189 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:19,189 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-04-29 03:41:19,189 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-04-29 03:41:19,190 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:19,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:19,192 INFO L82 PathProgramCache]: Analyzing trace with hash 1643499, now seen corresponding path program 1 times [2021-04-29 03:41:19,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:19,193 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379257156] [2021-04-29 03:41:19,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:19,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:19,205 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:19,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:19,214 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:19,217 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:19,218 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:19,218 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-04-29 03:41:19,218 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:19,220 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-04-29 03:41:19,237 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:19,237 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:19,239 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:19,240 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:19,240 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:19,240 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:19,240 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:19,240 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:19,240 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:19,241 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:19,247 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 14 transitions, 49 flow [2021-04-29 03:41:19,263 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-04-29 03:41:19,264 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,264 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. [2021-04-29 03:41:19,264 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 14 transitions, 49 flow [2021-04-29 03:41:19,265 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 19 places, 12 transitions, 45 flow [2021-04-29 03:41:19,265 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:19,266 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 19 places, 12 transitions, 45 flow [2021-04-29 03:41:19,266 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 19 places, 12 transitions, 45 flow [2021-04-29 03:41:19,268 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 19 places, 12 transitions, 45 flow [2021-04-29 03:41:19,274 INFO L129 PetriNetUnfolder]: 0/15 cut-off events. [2021-04-29 03:41:19,276 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,276 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. [2021-04-29 03:41:19,277 INFO L146 LiptonReduction]: Number of co-enabled transitions 60 [2021-04-29 03:41:19,410 INFO L158 LiptonReduction]: Checked pairs total: 21 [2021-04-29 03:41:19,410 INFO L160 LiptonReduction]: Total number of compositions: 3 [2021-04-29 03:41:19,410 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 145 [2021-04-29 03:41:19,422 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-04-29 03:41:19,422 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,422 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:19,422 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:19,423 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:19,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:19,425 INFO L82 PathProgramCache]: Analyzing trace with hash 2211, now seen corresponding path program 1 times [2021-04-29 03:41:19,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:19,426 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171811331] [2021-04-29 03:41:19,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:19,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:19,440 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:19,441 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:19,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:19,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171811331] [2021-04-29 03:41:19,446 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:19,449 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:19,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252466610] [2021-04-29 03:41:19,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:19,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:19,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:19,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:19,461 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 17 [2021-04-29 03:41:19,463 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 19 places, 12 transitions, 45 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) [2021-04-29 03:41:19,463 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:19,463 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 17 [2021-04-29 03:41:19,463 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:19,527 INFO L129 PetriNetUnfolder]: 28/59 cut-off events. [2021-04-29 03:41:19,527 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,529 INFO L84 FinitePrefix]: Finished finitePrefix Result has 131 conditions, 59 events. 28/59 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 19. Compared 238 event pairs, 28 based on Foata normal form. 30/56 useless extension candidates. Maximal degree in co-relation 108. Up to 55 conditions per place. [2021-04-29 03:41:19,533 INFO L132 encePairwiseOnDemand]: 15/17 looper letters, 6 selfloop transitions, 1 changer transitions 0/11 dead transitions. [2021-04-29 03:41:19,534 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 20 places, 11 transitions, 57 flow [2021-04-29 03:41:19,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:19,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:19,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 32 transitions. [2021-04-29 03:41:19,538 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6274509803921569 [2021-04-29 03:41:19,538 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 32 transitions. [2021-04-29 03:41:19,538 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 32 transitions. [2021-04-29 03:41:19,539 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:19,539 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 32 transitions. [2021-04-29 03:41:19,542 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 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) [2021-04-29 03:41:19,546 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) [2021-04-29 03:41:19,546 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) [2021-04-29 03:41:19,547 INFO L185 Difference]: Start difference. First operand has 19 places, 12 transitions, 45 flow. Second operand 3 states and 32 transitions. [2021-04-29 03:41:19,547 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 20 places, 11 transitions, 57 flow [2021-04-29 03:41:19,548 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 11 transitions, 51 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:19,550 INFO L241 Difference]: Finished difference. Result has 20 places, 11 transitions, 39 flow [2021-04-29 03:41:19,551 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=17, PETRI_DIFFERENCE_MINUEND_FLOW=37, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=39, PETRI_PLACES=20, PETRI_TRANSITIONS=11} [2021-04-29 03:41:19,551 INFO L343 CegarLoopForPetriNet]: 19 programPoint places, 1 predicate places. [2021-04-29 03:41:19,551 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:19,552 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 20 places, 11 transitions, 39 flow [2021-04-29 03:41:19,552 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 20 places, 11 transitions, 39 flow [2021-04-29 03:41:19,553 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 11 transitions, 39 flow [2021-04-29 03:41:19,556 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-04-29 03:41:19,556 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,556 INFO L84 FinitePrefix]: Finished finitePrefix Result has 26 conditions, 11 events. 0/11 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. 0/8 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-04-29 03:41:19,557 INFO L146 LiptonReduction]: Number of co-enabled transitions 48 [2021-04-29 03:41:19,559 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:19,560 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:19,560 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 9 [2021-04-29 03:41:19,562 INFO L480 AbstractCegarLoop]: Abstraction has has 20 places, 11 transitions, 39 flow [2021-04-29 03:41:19,562 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) [2021-04-29 03:41:19,563 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:19,563 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-04-29 03:41:19,563 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-04-29 03:41:19,563 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:19,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:19,564 INFO L82 PathProgramCache]: Analyzing trace with hash 66279044, now seen corresponding path program 1 times [2021-04-29 03:41:19,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:19,565 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1287501531] [2021-04-29 03:41:19,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:19,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:19,579 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:19,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:19,590 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:19,592 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:19,592 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:19,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-04-29 03:41:19,593 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:19,593 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-04-29 03:41:19,604 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:19,604 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:19,606 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:19,606 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:19,607 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:19,607 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:19,608 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:19,608 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:19,608 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:19,608 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:19,610 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 17 transitions, 66 flow [2021-04-29 03:41:19,625 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-04-29 03:41:19,626 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,626 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. [2021-04-29 03:41:19,626 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 17 transitions, 66 flow [2021-04-29 03:41:19,627 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 15 transitions, 62 flow [2021-04-29 03:41:19,627 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:19,627 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 24 places, 15 transitions, 62 flow [2021-04-29 03:41:19,627 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 24 places, 15 transitions, 62 flow [2021-04-29 03:41:19,629 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 15 transitions, 62 flow [2021-04-29 03:41:19,637 INFO L129 PetriNetUnfolder]: 0/19 cut-off events. [2021-04-29 03:41:19,637 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,638 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. [2021-04-29 03:41:19,638 INFO L146 LiptonReduction]: Number of co-enabled transitions 104 [2021-04-29 03:41:19,779 INFO L158 LiptonReduction]: Checked pairs total: 38 [2021-04-29 03:41:19,779 INFO L160 LiptonReduction]: Total number of compositions: 4 [2021-04-29 03:41:19,779 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 152 [2021-04-29 03:41:19,782 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-04-29 03:41:19,782 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,782 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:19,782 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:19,782 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:19,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:19,783 INFO L82 PathProgramCache]: Analyzing trace with hash 2851, now seen corresponding path program 1 times [2021-04-29 03:41:19,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:19,784 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834759668] [2021-04-29 03:41:19,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:19,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:19,791 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:19,791 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:19,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:19,796 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834759668] [2021-04-29 03:41:19,796 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:19,796 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:19,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957655021] [2021-04-29 03:41:19,797 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:19,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:19,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:19,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:19,799 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 21 [2021-04-29 03:41:19,800 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 15 transitions, 62 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) [2021-04-29 03:41:19,800 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:19,801 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 21 [2021-04-29 03:41:19,801 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:19,864 INFO L129 PetriNetUnfolder]: 136/222 cut-off events. [2021-04-29 03:41:19,864 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,865 INFO L84 FinitePrefix]: Finished finitePrefix Result has 463 conditions, 222 events. 136/222 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 50. Compared 1067 event pairs, 136 based on Foata normal form. 85/185 useless extension candidates. Maximal degree in co-relation 432. Up to 217 conditions per place. [2021-04-29 03:41:19,868 INFO L132 encePairwiseOnDemand]: 19/21 looper letters, 8 selfloop transitions, 1 changer transitions 0/14 dead transitions. [2021-04-29 03:41:19,868 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 14 transitions, 78 flow [2021-04-29 03:41:19,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:19,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:19,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 40 transitions. [2021-04-29 03:41:19,870 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6349206349206349 [2021-04-29 03:41:19,870 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 40 transitions. [2021-04-29 03:41:19,870 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 40 transitions. [2021-04-29 03:41:19,870 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:19,870 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 40 transitions. [2021-04-29 03:41:19,871 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-04-29 03:41:19,871 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) [2021-04-29 03:41:19,872 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) [2021-04-29 03:41:19,872 INFO L185 Difference]: Start difference. First operand has 24 places, 15 transitions, 62 flow. Second operand 3 states and 40 transitions. [2021-04-29 03:41:19,872 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 14 transitions, 78 flow [2021-04-29 03:41:19,873 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 14 transitions, 66 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:19,874 INFO L241 Difference]: Finished difference. Result has 25 places, 14 transitions, 50 flow [2021-04-29 03:41:19,874 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=21, PETRI_DIFFERENCE_MINUEND_FLOW=48, PETRI_DIFFERENCE_MINUEND_PLACES=23, 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=50, PETRI_PLACES=25, PETRI_TRANSITIONS=14} [2021-04-29 03:41:19,874 INFO L343 CegarLoopForPetriNet]: 24 programPoint places, 1 predicate places. [2021-04-29 03:41:19,874 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:19,874 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 25 places, 14 transitions, 50 flow [2021-04-29 03:41:19,875 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 25 places, 14 transitions, 50 flow [2021-04-29 03:41:19,875 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 25 places, 14 transitions, 50 flow [2021-04-29 03:41:19,877 INFO L129 PetriNetUnfolder]: 0/14 cut-off events. [2021-04-29 03:41:19,877 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,877 INFO L84 FinitePrefix]: Finished finitePrefix Result has 33 conditions, 14 events. 0/14 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 18 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. [2021-04-29 03:41:19,878 INFO L146 LiptonReduction]: Number of co-enabled transitions 88 [2021-04-29 03:41:19,879 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:19,879 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:19,879 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-04-29 03:41:19,881 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 14 transitions, 50 flow [2021-04-29 03:41:19,881 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) [2021-04-29 03:41:19,881 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:19,881 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-04-29 03:41:19,881 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-04-29 03:41:19,881 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:19,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:19,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1646739026, now seen corresponding path program 1 times [2021-04-29 03:41:19,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:19,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322923690] [2021-04-29 03:41:19,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:19,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:19,889 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:19,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:19,894 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:19,896 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:19,896 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:19,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-04-29 03:41:19,897 WARN L342 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:19,898 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-04-29 03:41:19,907 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:19,907 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:19,909 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:19,909 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:19,909 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:19,909 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:19,909 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:19,909 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:19,909 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:19,909 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:19,910 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 20 transitions, 85 flow [2021-04-29 03:41:19,914 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-04-29 03:41:19,914 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,914 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. [2021-04-29 03:41:19,914 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 20 transitions, 85 flow [2021-04-29 03:41:19,915 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 18 transitions, 81 flow [2021-04-29 03:41:19,915 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:19,915 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 18 transitions, 81 flow [2021-04-29 03:41:19,916 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 18 transitions, 81 flow [2021-04-29 03:41:19,916 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 18 transitions, 81 flow [2021-04-29 03:41:19,919 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-04-29 03:41:19,920 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:19,920 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. [2021-04-29 03:41:19,921 INFO L146 LiptonReduction]: Number of co-enabled transitions 160 [2021-04-29 03:41:20,071 INFO L158 LiptonReduction]: Checked pairs total: 60 [2021-04-29 03:41:20,071 INFO L160 LiptonReduction]: Total number of compositions: 5 [2021-04-29 03:41:20,072 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 157 [2021-04-29 03:41:20,074 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-04-29 03:41:20,074 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,074 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:20,074 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:20,074 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:20,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:20,075 INFO L82 PathProgramCache]: Analyzing trace with hash 3619, now seen corresponding path program 1 times [2021-04-29 03:41:20,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:20,076 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843393978] [2021-04-29 03:41:20,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:20,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:20,085 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:20,086 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:20,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:20,089 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843393978] [2021-04-29 03:41:20,090 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:20,090 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:20,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159172508] [2021-04-29 03:41:20,090 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:20,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:20,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:20,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:20,092 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-04-29 03:41:20,092 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 18 transitions, 81 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) [2021-04-29 03:41:20,092 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:20,092 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-04-29 03:41:20,092 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:20,223 INFO L129 PetriNetUnfolder]: 568/817 cut-off events. [2021-04-29 03:41:20,223 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,227 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1660 conditions, 817 events. 568/817 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 138. Compared 4066 event pairs, 568 based on Foata normal form. 248/626 useless extension candidates. Maximal degree in co-relation 1620. Up to 811 conditions per place. [2021-04-29 03:41:20,236 INFO L132 encePairwiseOnDemand]: 23/25 looper letters, 10 selfloop transitions, 1 changer transitions 0/17 dead transitions. [2021-04-29 03:41:20,236 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 17 transitions, 101 flow [2021-04-29 03:41:20,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:20,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:20,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 48 transitions. [2021-04-29 03:41:20,238 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.64 [2021-04-29 03:41:20,238 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 48 transitions. [2021-04-29 03:41:20,238 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 48 transitions. [2021-04-29 03:41:20,239 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:20,239 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 48 transitions. [2021-04-29 03:41:20,240 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-04-29 03:41:20,241 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) [2021-04-29 03:41:20,241 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) [2021-04-29 03:41:20,241 INFO L185 Difference]: Start difference. First operand has 29 places, 18 transitions, 81 flow. Second operand 3 states and 48 transitions. [2021-04-29 03:41:20,241 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 30 places, 17 transitions, 101 flow [2021-04-29 03:41:20,243 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 17 transitions, 81 flow, removed 10 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:20,244 INFO L241 Difference]: Finished difference. Result has 30 places, 17 transitions, 61 flow [2021-04-29 03:41:20,244 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=25, PETRI_DIFFERENCE_MINUEND_FLOW=59, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=17, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=61, PETRI_PLACES=30, PETRI_TRANSITIONS=17} [2021-04-29 03:41:20,244 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 1 predicate places. [2021-04-29 03:41:20,245 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:20,245 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 30 places, 17 transitions, 61 flow [2021-04-29 03:41:20,245 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 30 places, 17 transitions, 61 flow [2021-04-29 03:41:20,246 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 30 places, 17 transitions, 61 flow [2021-04-29 03:41:20,248 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-04-29 03:41:20,248 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,249 INFO L84 FinitePrefix]: Finished finitePrefix Result has 40 conditions, 17 events. 0/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 25 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. [2021-04-29 03:41:20,249 INFO L146 LiptonReduction]: Number of co-enabled transitions 140 [2021-04-29 03:41:20,251 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:20,251 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:20,251 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-04-29 03:41:20,252 INFO L480 AbstractCegarLoop]: Abstraction has has 30 places, 17 transitions, 61 flow [2021-04-29 03:41:20,253 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) [2021-04-29 03:41:20,253 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:20,253 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-04-29 03:41:20,253 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-04-29 03:41:20,253 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:20,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:20,254 INFO L82 PathProgramCache]: Analyzing trace with hash 1085119695, now seen corresponding path program 1 times [2021-04-29 03:41:20,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:20,255 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150630978] [2021-04-29 03:41:20,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:20,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:20,260 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:20,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:20,264 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:20,266 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:20,266 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:20,267 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-04-29 03:41:20,267 WARN L342 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:20,267 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-04-29 03:41:20,278 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:20,278 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:20,280 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:20,280 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:20,280 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:20,281 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:20,281 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:20,281 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:20,281 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:20,281 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:20,282 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 36 places, 23 transitions, 106 flow [2021-04-29 03:41:20,287 INFO L129 PetriNetUnfolder]: 0/41 cut-off events. [2021-04-29 03:41:20,287 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,287 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. [2021-04-29 03:41:20,287 INFO L82 GeneralOperation]: Start removeDead. Operand has 36 places, 23 transitions, 106 flow [2021-04-29 03:41:20,288 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 21 transitions, 102 flow [2021-04-29 03:41:20,288 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:20,288 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 21 transitions, 102 flow [2021-04-29 03:41:20,289 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 21 transitions, 102 flow [2021-04-29 03:41:20,289 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 21 transitions, 102 flow [2021-04-29 03:41:20,293 INFO L129 PetriNetUnfolder]: 0/27 cut-off events. [2021-04-29 03:41:20,293 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,293 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. [2021-04-29 03:41:20,294 INFO L146 LiptonReduction]: Number of co-enabled transitions 228 [2021-04-29 03:41:20,432 INFO L158 LiptonReduction]: Checked pairs total: 87 [2021-04-29 03:41:20,432 INFO L160 LiptonReduction]: Total number of compositions: 6 [2021-04-29 03:41:20,432 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 144 [2021-04-29 03:41:20,434 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-04-29 03:41:20,434 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,434 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:20,434 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:20,434 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:20,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:20,435 INFO L82 PathProgramCache]: Analyzing trace with hash 4515, now seen corresponding path program 1 times [2021-04-29 03:41:20,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:20,435 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928624544] [2021-04-29 03:41:20,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:20,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:20,441 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:20,442 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:20,444 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:20,444 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928624544] [2021-04-29 03:41:20,445 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:20,445 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:20,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889397171] [2021-04-29 03:41:20,445 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:20,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:20,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:20,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:20,446 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 29 [2021-04-29 03:41:20,447 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 21 transitions, 102 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) [2021-04-29 03:41:20,447 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:20,447 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 29 [2021-04-29 03:41:20,447 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:20,774 INFO L129 PetriNetUnfolder]: 2188/2924 cut-off events. [2021-04-29 03:41:20,774 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,783 INFO L84 FinitePrefix]: Finished finitePrefix Result has 5882 conditions, 2924 events. 2188/2924 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 394. Compared 15248 event pairs, 2188 based on Foata normal form. 735/2127 useless extension candidates. Maximal degree in co-relation 5832. Up to 2917 conditions per place. [2021-04-29 03:41:20,807 INFO L132 encePairwiseOnDemand]: 27/29 looper letters, 12 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2021-04-29 03:41:20,807 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 35 places, 20 transitions, 126 flow [2021-04-29 03:41:20,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:20,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:20,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 56 transitions. [2021-04-29 03:41:20,809 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6436781609195402 [2021-04-29 03:41:20,809 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 56 transitions. [2021-04-29 03:41:20,809 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 56 transitions. [2021-04-29 03:41:20,809 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:20,809 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 56 transitions. [2021-04-29 03:41:20,810 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 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) [2021-04-29 03:41:20,811 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) [2021-04-29 03:41:20,811 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) [2021-04-29 03:41:20,811 INFO L185 Difference]: Start difference. First operand has 34 places, 21 transitions, 102 flow. Second operand 3 states and 56 transitions. [2021-04-29 03:41:20,811 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 35 places, 20 transitions, 126 flow [2021-04-29 03:41:20,813 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 35 places, 20 transitions, 96 flow, removed 15 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:20,815 INFO L241 Difference]: Finished difference. Result has 35 places, 20 transitions, 72 flow [2021-04-29 03:41:20,815 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=70, PETRI_DIFFERENCE_MINUEND_PLACES=33, 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=72, PETRI_PLACES=35, PETRI_TRANSITIONS=20} [2021-04-29 03:41:20,816 INFO L343 CegarLoopForPetriNet]: 34 programPoint places, 1 predicate places. [2021-04-29 03:41:20,816 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:20,816 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 35 places, 20 transitions, 72 flow [2021-04-29 03:41:20,817 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 35 places, 20 transitions, 72 flow [2021-04-29 03:41:20,817 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 35 places, 20 transitions, 72 flow [2021-04-29 03:41:20,821 INFO L129 PetriNetUnfolder]: 0/20 cut-off events. [2021-04-29 03:41:20,821 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,821 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47 conditions, 20 events. 0/20 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 28 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. [2021-04-29 03:41:20,822 INFO L146 LiptonReduction]: Number of co-enabled transitions 204 [2021-04-29 03:41:20,824 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:20,824 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:20,825 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 9 [2021-04-29 03:41:20,826 INFO L480 AbstractCegarLoop]: Abstraction has has 35 places, 20 transitions, 72 flow [2021-04-29 03:41:20,826 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) [2021-04-29 03:41:20,826 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:20,827 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-04-29 03:41:20,827 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-04-29 03:41:20,827 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:20,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:20,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1719135375, now seen corresponding path program 1 times [2021-04-29 03:41:20,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:20,829 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707702717] [2021-04-29 03:41:20,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:20,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:20,835 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:20,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:20,838 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:20,840 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:20,841 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:20,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-04-29 03:41:20,841 WARN L342 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:20,841 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-04-29 03:41:20,851 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:20,852 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:20,853 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:20,853 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:20,853 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:20,853 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:20,853 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:20,853 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:20,854 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:20,854 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:20,855 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 26 transitions, 129 flow [2021-04-29 03:41:20,859 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-04-29 03:41:20,859 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,859 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. [2021-04-29 03:41:20,859 INFO L82 GeneralOperation]: Start removeDead. Operand has 41 places, 26 transitions, 129 flow [2021-04-29 03:41:20,860 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 39 places, 24 transitions, 125 flow [2021-04-29 03:41:20,860 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:20,860 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 39 places, 24 transitions, 125 flow [2021-04-29 03:41:20,861 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 39 places, 24 transitions, 125 flow [2021-04-29 03:41:20,861 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 39 places, 24 transitions, 125 flow [2021-04-29 03:41:20,864 INFO L129 PetriNetUnfolder]: 0/31 cut-off events. [2021-04-29 03:41:20,864 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:20,865 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. [2021-04-29 03:41:20,865 INFO L146 LiptonReduction]: Number of co-enabled transitions 308 [2021-04-29 03:41:21,034 INFO L158 LiptonReduction]: Checked pairs total: 119 [2021-04-29 03:41:21,034 INFO L160 LiptonReduction]: Total number of compositions: 7 [2021-04-29 03:41:21,035 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 174 [2021-04-29 03:41:21,037 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-04-29 03:41:21,037 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:21,037 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:21,038 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:21,038 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:21,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:21,039 INFO L82 PathProgramCache]: Analyzing trace with hash 5539, now seen corresponding path program 1 times [2021-04-29 03:41:21,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:21,039 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923998859] [2021-04-29 03:41:21,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:21,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:21,047 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:21,047 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:21,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:21,050 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923998859] [2021-04-29 03:41:21,050 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:21,051 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:21,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113529150] [2021-04-29 03:41:21,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:21,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:21,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:21,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:21,052 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 33 [2021-04-29 03:41:21,052 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 24 transitions, 125 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) [2021-04-29 03:41:21,053 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:21,053 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 33 [2021-04-29 03:41:21,053 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:22,489 INFO L129 PetriNetUnfolder]: 8020/10215 cut-off events. [2021-04-29 03:41:22,490 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:22,536 INFO L84 FinitePrefix]: Finished finitePrefix Result has 20473 conditions, 10215 events. 8020/10215 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1130. Compared 54243 event pairs, 8020 based on Foata normal form. 2194/7150 useless extension candidates. Maximal degree in co-relation 20412. Up to 10207 conditions per place. [2021-04-29 03:41:22,627 INFO L132 encePairwiseOnDemand]: 31/33 looper letters, 14 selfloop transitions, 1 changer transitions 0/23 dead transitions. [2021-04-29 03:41:22,628 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 23 transitions, 153 flow [2021-04-29 03:41:22,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:22,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:22,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 64 transitions. [2021-04-29 03:41:22,633 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6464646464646465 [2021-04-29 03:41:22,633 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 64 transitions. [2021-04-29 03:41:22,633 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 64 transitions. [2021-04-29 03:41:22,633 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:22,634 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 64 transitions. [2021-04-29 03:41:22,636 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) [2021-04-29 03:41:22,637 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) [2021-04-29 03:41:22,637 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) [2021-04-29 03:41:22,637 INFO L185 Difference]: Start difference. First operand has 39 places, 24 transitions, 125 flow. Second operand 3 states and 64 transitions. [2021-04-29 03:41:22,637 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 40 places, 23 transitions, 153 flow [2021-04-29 03:41:22,640 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 40 places, 23 transitions, 111 flow, removed 21 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:22,641 INFO L241 Difference]: Finished difference. Result has 40 places, 23 transitions, 83 flow [2021-04-29 03:41:22,641 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=33, PETRI_DIFFERENCE_MINUEND_FLOW=81, PETRI_DIFFERENCE_MINUEND_PLACES=38, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=23, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=22, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=83, PETRI_PLACES=40, PETRI_TRANSITIONS=23} [2021-04-29 03:41:22,641 INFO L343 CegarLoopForPetriNet]: 39 programPoint places, 1 predicate places. [2021-04-29 03:41:22,642 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:22,642 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 40 places, 23 transitions, 83 flow [2021-04-29 03:41:22,642 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 40 places, 23 transitions, 83 flow [2021-04-29 03:41:22,643 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 40 places, 23 transitions, 83 flow [2021-04-29 03:41:22,646 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-04-29 03:41:22,646 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:22,647 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 51 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. [2021-04-29 03:41:22,647 INFO L146 LiptonReduction]: Number of co-enabled transitions 280 [2021-04-29 03:41:22,650 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:22,650 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:22,651 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 9 [2021-04-29 03:41:22,655 INFO L480 AbstractCegarLoop]: Abstraction has has 40 places, 23 transitions, 83 flow [2021-04-29 03:41:22,656 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) [2021-04-29 03:41:22,656 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:22,656 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-29 03:41:22,656 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-04-29 03:41:22,656 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:22,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:22,657 INFO L82 PathProgramCache]: Analyzing trace with hash 779611434, now seen corresponding path program 1 times [2021-04-29 03:41:22,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:22,657 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054115768] [2021-04-29 03:41:22,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:22,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:22,674 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:22,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:22,691 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:22,698 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:22,699 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:22,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-04-29 03:41:22,699 WARN L342 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:22,699 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2021-04-29 03:41:22,714 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:22,715 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:22,717 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:22,717 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:22,717 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:22,717 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:22,717 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:22,717 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:22,717 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:22,718 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:22,721 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 29 transitions, 154 flow [2021-04-29 03:41:22,729 INFO L129 PetriNetUnfolder]: 0/53 cut-off events. [2021-04-29 03:41:22,729 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:22,730 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. [2021-04-29 03:41:22,730 INFO L82 GeneralOperation]: Start removeDead. Operand has 46 places, 29 transitions, 154 flow [2021-04-29 03:41:22,731 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 44 places, 27 transitions, 150 flow [2021-04-29 03:41:22,731 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:22,731 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 44 places, 27 transitions, 150 flow [2021-04-29 03:41:22,732 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 44 places, 27 transitions, 150 flow [2021-04-29 03:41:22,732 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 44 places, 27 transitions, 150 flow [2021-04-29 03:41:22,738 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-04-29 03:41:22,739 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:22,739 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. [2021-04-29 03:41:22,740 INFO L146 LiptonReduction]: Number of co-enabled transitions 400 [2021-04-29 03:41:22,981 INFO L158 LiptonReduction]: Checked pairs total: 156 [2021-04-29 03:41:22,981 INFO L160 LiptonReduction]: Total number of compositions: 8 [2021-04-29 03:41:22,981 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 250 [2021-04-29 03:41:22,982 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-04-29 03:41:22,983 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:22,983 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:22,983 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:22,983 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:22,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:22,983 INFO L82 PathProgramCache]: Analyzing trace with hash 6691, now seen corresponding path program 1 times [2021-04-29 03:41:22,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:22,984 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74511942] [2021-04-29 03:41:22,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:22,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:22,990 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:22,991 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:22,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:22,994 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74511942] [2021-04-29 03:41:22,994 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:22,994 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:22,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962640489] [2021-04-29 03:41:22,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:22,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:22,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:22,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:22,995 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 37 [2021-04-29 03:41:22,996 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 27 transitions, 150 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) [2021-04-29 03:41:22,996 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:22,996 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 37 [2021-04-29 03:41:22,996 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:28,148 INFO L129 PetriNetUnfolder]: 28432/35002 cut-off events. [2021-04-29 03:41:28,148 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:28,503 INFO L84 FinitePrefix]: Finished finitePrefix Result has 70057 conditions, 35002 events. 28432/35002 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3306. Compared 187804 event pairs, 28432 based on Foata normal form. 6569/23751 useless extension candidates. Maximal degree in co-relation 69984. Up to 34993 conditions per place. [2021-04-29 03:41:28,728 INFO L132 encePairwiseOnDemand]: 35/37 looper letters, 16 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2021-04-29 03:41:28,728 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 26 transitions, 182 flow [2021-04-29 03:41:28,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:28,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:28,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 72 transitions. [2021-04-29 03:41:28,731 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6486486486486487 [2021-04-29 03:41:28,732 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 72 transitions. [2021-04-29 03:41:28,732 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 72 transitions. [2021-04-29 03:41:28,733 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:28,733 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 72 transitions. [2021-04-29 03:41:28,734 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-04-29 03:41:28,737 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) [2021-04-29 03:41:28,738 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) [2021-04-29 03:41:28,738 INFO L185 Difference]: Start difference. First operand has 44 places, 27 transitions, 150 flow. Second operand 3 states and 72 transitions. [2021-04-29 03:41:28,738 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 26 transitions, 182 flow [2021-04-29 03:41:28,747 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 26 transitions, 126 flow, removed 28 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:28,750 INFO L241 Difference]: Finished difference. Result has 45 places, 26 transitions, 94 flow [2021-04-29 03:41:28,750 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=37, PETRI_DIFFERENCE_MINUEND_FLOW=92, PETRI_DIFFERENCE_MINUEND_PLACES=43, 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=94, PETRI_PLACES=45, PETRI_TRANSITIONS=26} [2021-04-29 03:41:28,750 INFO L343 CegarLoopForPetriNet]: 44 programPoint places, 1 predicate places. [2021-04-29 03:41:28,750 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:28,751 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 45 places, 26 transitions, 94 flow [2021-04-29 03:41:28,752 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 45 places, 26 transitions, 94 flow [2021-04-29 03:41:28,752 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 45 places, 26 transitions, 94 flow [2021-04-29 03:41:28,762 INFO L129 PetriNetUnfolder]: 0/26 cut-off events. [2021-04-29 03:41:28,762 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:28,763 INFO L84 FinitePrefix]: Finished finitePrefix Result has 61 conditions, 26 events. 0/26 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 48 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. [2021-04-29 03:41:28,764 INFO L146 LiptonReduction]: Number of co-enabled transitions 368 [2021-04-29 03:41:28,768 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:28,768 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:28,768 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 18 [2021-04-29 03:41:28,773 INFO L480 AbstractCegarLoop]: Abstraction has has 45 places, 26 transitions, 94 flow [2021-04-29 03:41:28,773 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) [2021-04-29 03:41:28,774 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:28,774 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-29 03:41:28,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-04-29 03:41:28,774 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:28,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:28,776 INFO L82 PathProgramCache]: Analyzing trace with hash -2053304524, now seen corresponding path program 1 times [2021-04-29 03:41:28,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:28,776 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863527361] [2021-04-29 03:41:28,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:28,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:28,794 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:28,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:28,809 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:28,813 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:28,813 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:28,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-04-29 03:41:28,814 WARN L342 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:28,816 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2021-04-29 03:41:28,833 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:28,834 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:28,836 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:28,836 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:28,836 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:28,836 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:28,836 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:28,836 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:28,836 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:28,836 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:28,839 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 51 places, 32 transitions, 181 flow [2021-04-29 03:41:28,846 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-04-29 03:41:28,847 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:28,847 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. [2021-04-29 03:41:28,847 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 32 transitions, 181 flow [2021-04-29 03:41:28,848 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 30 transitions, 177 flow [2021-04-29 03:41:28,848 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:28,849 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 30 transitions, 177 flow [2021-04-29 03:41:28,850 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 30 transitions, 177 flow [2021-04-29 03:41:28,850 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 30 transitions, 177 flow [2021-04-29 03:41:28,860 INFO L129 PetriNetUnfolder]: 0/39 cut-off events. [2021-04-29 03:41:28,861 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:28,861 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. [2021-04-29 03:41:28,862 INFO L146 LiptonReduction]: Number of co-enabled transitions 504 [2021-04-29 03:41:29,221 INFO L158 LiptonReduction]: Checked pairs total: 198 [2021-04-29 03:41:29,221 INFO L160 LiptonReduction]: Total number of compositions: 9 [2021-04-29 03:41:29,222 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 374 [2021-04-29 03:41:29,225 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-04-29 03:41:29,225 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:29,225 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:29,225 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:29,225 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:29,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:29,226 INFO L82 PathProgramCache]: Analyzing trace with hash 7971, now seen corresponding path program 1 times [2021-04-29 03:41:29,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:29,227 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547349799] [2021-04-29 03:41:29,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:29,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:29,236 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:29,237 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:29,240 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:29,241 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547349799] [2021-04-29 03:41:29,241 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:29,241 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:29,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422796509] [2021-04-29 03:41:29,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:29,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:29,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:29,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:29,245 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 41 [2021-04-29 03:41:29,246 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 30 transitions, 177 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) [2021-04-29 03:41:29,246 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:29,246 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 41 [2021-04-29 03:41:29,246 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:41:42,075 INFO L129 PetriNetUnfolder]: 98416/118109 cut-off events. [2021-04-29 03:41:42,075 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:42,739 INFO L84 FinitePrefix]: Finished finitePrefix Result has 236282 conditions, 118109 events. 98416/118109 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9514. Compared 639671 event pairs, 98416 based on Foata normal form. 19692/78084 useless extension candidates. Maximal degree in co-relation 236196. Up to 118099 conditions per place. [2021-04-29 03:41:43,280 INFO L132 encePairwiseOnDemand]: 39/41 looper letters, 18 selfloop transitions, 1 changer transitions 0/29 dead transitions. [2021-04-29 03:41:43,280 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 50 places, 29 transitions, 213 flow [2021-04-29 03:41:43,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:41:43,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:41:43,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 80 transitions. [2021-04-29 03:41:43,282 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6504065040650406 [2021-04-29 03:41:43,282 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 80 transitions. [2021-04-29 03:41:43,282 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 80 transitions. [2021-04-29 03:41:43,282 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:41:43,283 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 80 transitions. [2021-04-29 03:41:43,287 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 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) [2021-04-29 03:41:43,288 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) [2021-04-29 03:41:43,288 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) [2021-04-29 03:41:43,289 INFO L185 Difference]: Start difference. First operand has 49 places, 30 transitions, 177 flow. Second operand 3 states and 80 transitions. [2021-04-29 03:41:43,289 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 50 places, 29 transitions, 213 flow [2021-04-29 03:41:43,290 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 50 places, 29 transitions, 141 flow, removed 36 selfloop flow, removed 0 redundant places. [2021-04-29 03:41:43,291 INFO L241 Difference]: Finished difference. Result has 50 places, 29 transitions, 105 flow [2021-04-29 03:41:43,292 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=41, PETRI_DIFFERENCE_MINUEND_FLOW=103, PETRI_DIFFERENCE_MINUEND_PLACES=48, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=29, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=28, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=105, PETRI_PLACES=50, PETRI_TRANSITIONS=29} [2021-04-29 03:41:43,292 INFO L343 CegarLoopForPetriNet]: 49 programPoint places, 1 predicate places. [2021-04-29 03:41:43,292 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:43,292 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 50 places, 29 transitions, 105 flow [2021-04-29 03:41:43,293 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 50 places, 29 transitions, 105 flow [2021-04-29 03:41:43,293 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 50 places, 29 transitions, 105 flow [2021-04-29 03:41:43,297 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-04-29 03:41:43,297 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:43,297 INFO L84 FinitePrefix]: Finished finitePrefix Result has 68 conditions, 29 events. 0/29 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 44 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. [2021-04-29 03:41:43,298 INFO L146 LiptonReduction]: Number of co-enabled transitions 468 [2021-04-29 03:41:43,301 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:41:43,301 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:41:43,301 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 9 [2021-04-29 03:41:43,302 INFO L480 AbstractCegarLoop]: Abstraction has has 50 places, 29 transitions, 105 flow [2021-04-29 03:41:43,302 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) [2021-04-29 03:41:43,302 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:43,303 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-29 03:41:43,303 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-04-29 03:41:43,303 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:43,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:43,304 INFO L82 PathProgramCache]: Analyzing trace with hash -607272555, now seen corresponding path program 1 times [2021-04-29 03:41:43,304 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:43,304 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630058828] [2021-04-29 03:41:43,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:43,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:43,310 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:43,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:41:43,314 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:41:43,316 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:41:43,316 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:41:43,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-04-29 03:41:43,317 WARN L342 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:41:43,317 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2021-04-29 03:41:43,332 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:41:43,333 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:41:43,334 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:41:43,334 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:41:43,334 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:41:43,334 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:41:43,335 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:41:43,335 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:41:43,335 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:41:43,335 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:41:43,336 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 56 places, 35 transitions, 210 flow [2021-04-29 03:41:43,343 INFO L129 PetriNetUnfolder]: 0/65 cut-off events. [2021-04-29 03:41:43,343 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:43,344 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. [2021-04-29 03:41:43,344 INFO L82 GeneralOperation]: Start removeDead. Operand has 56 places, 35 transitions, 210 flow [2021-04-29 03:41:43,345 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 54 places, 33 transitions, 206 flow [2021-04-29 03:41:43,345 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:41:43,345 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 54 places, 33 transitions, 206 flow [2021-04-29 03:41:43,346 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 54 places, 33 transitions, 206 flow [2021-04-29 03:41:43,346 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 54 places, 33 transitions, 206 flow [2021-04-29 03:41:43,350 INFO L129 PetriNetUnfolder]: 0/43 cut-off events. [2021-04-29 03:41:43,350 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:43,351 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. [2021-04-29 03:41:43,352 INFO L146 LiptonReduction]: Number of co-enabled transitions 620 [2021-04-29 03:41:43,666 INFO L158 LiptonReduction]: Checked pairs total: 245 [2021-04-29 03:41:43,666 INFO L160 LiptonReduction]: Total number of compositions: 10 [2021-04-29 03:41:43,667 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 322 [2021-04-29 03:41:43,669 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-04-29 03:41:43,669 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:41:43,670 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:41:43,670 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:41:43,670 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:41:43,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:41:43,671 INFO L82 PathProgramCache]: Analyzing trace with hash 9379, now seen corresponding path program 1 times [2021-04-29 03:41:43,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:41:43,672 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157390628] [2021-04-29 03:41:43,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:41:43,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:41:43,681 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:41:43,681 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:41:43,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:41:43,684 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157390628] [2021-04-29 03:41:43,684 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:41:43,684 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:41:43,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77859340] [2021-04-29 03:41:43,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:41:43,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:41:43,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:41:43,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:41:43,689 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 45 [2021-04-29 03:41:43,689 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 33 transitions, 206 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) [2021-04-29 03:41:43,689 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:41:43,690 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 45 [2021-04-29 03:41:43,690 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:42:38,253 INFO L129 PetriNetUnfolder]: 334612/393672 cut-off events. [2021-04-29 03:42:38,253 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:42:41,148 INFO L84 FinitePrefix]: Finished finitePrefix Result has 787420 conditions, 393672 events. 334612/393672 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 27690. Compared 2131880 event pairs, 334612 based on Foata normal form. 59059/254555 useless extension candidates. Maximal degree in co-relation 787320. Up to 393661 conditions per place. [2021-04-29 03:42:42,805 INFO L132 encePairwiseOnDemand]: 43/45 looper letters, 20 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2021-04-29 03:42:42,805 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 32 transitions, 246 flow [2021-04-29 03:42:42,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-29 03:42:42,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-04-29 03:42:42,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 88 transitions. [2021-04-29 03:42:42,807 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6518518518518519 [2021-04-29 03:42:42,807 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 88 transitions. [2021-04-29 03:42:42,807 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 88 transitions. [2021-04-29 03:42:42,807 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-04-29 03:42:42,807 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 88 transitions. [2021-04-29 03:42:42,808 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 29.333333333333332) internal successors, (88), 3 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-04-29 03:42:42,808 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) [2021-04-29 03:42:42,808 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) [2021-04-29 03:42:42,808 INFO L185 Difference]: Start difference. First operand has 54 places, 33 transitions, 206 flow. Second operand 3 states and 88 transitions. [2021-04-29 03:42:42,808 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 55 places, 32 transitions, 246 flow [2021-04-29 03:42:42,810 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 55 places, 32 transitions, 156 flow, removed 45 selfloop flow, removed 0 redundant places. [2021-04-29 03:42:42,811 INFO L241 Difference]: Finished difference. Result has 55 places, 32 transitions, 116 flow [2021-04-29 03:42:42,811 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=45, PETRI_DIFFERENCE_MINUEND_FLOW=114, PETRI_DIFFERENCE_MINUEND_PLACES=53, 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=116, PETRI_PLACES=55, PETRI_TRANSITIONS=32} [2021-04-29 03:42:42,811 INFO L343 CegarLoopForPetriNet]: 54 programPoint places, 1 predicate places. [2021-04-29 03:42:42,811 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:42:42,812 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 55 places, 32 transitions, 116 flow [2021-04-29 03:42:42,812 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 55 places, 32 transitions, 116 flow [2021-04-29 03:42:42,812 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 55 places, 32 transitions, 116 flow [2021-04-29 03:42:42,815 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-04-29 03:42:42,815 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:42:42,815 INFO L84 FinitePrefix]: Finished finitePrefix Result has 75 conditions, 32 events. 0/32 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 65 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. [2021-04-29 03:42:42,816 INFO L146 LiptonReduction]: Number of co-enabled transitions 580 [2021-04-29 03:42:42,818 INFO L158 LiptonReduction]: Checked pairs total: 0 [2021-04-29 03:42:42,819 INFO L160 LiptonReduction]: Total number of compositions: 0 [2021-04-29 03:42:42,819 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 8 [2021-04-29 03:42:42,819 INFO L480 AbstractCegarLoop]: Abstraction has has 55 places, 32 transitions, 116 flow [2021-04-29 03:42:42,820 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) [2021-04-29 03:42:42,820 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:42:42,820 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-29 03:42:42,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-04-29 03:42:42,820 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:42:42,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:42:42,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1208304905, now seen corresponding path program 1 times [2021-04-29 03:42:42,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:42:42,821 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105728848] [2021-04-29 03:42:42,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:42:42,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:42:42,826 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:42:42,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-29 03:42:42,830 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-29 03:42:42,832 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-29 03:42:42,832 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-04-29 03:42:42,832 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-04-29 03:42:42,833 WARN L342 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2021-04-29 03:42:42,833 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2021-04-29 03:42:42,850 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-04-29 03:42:42,851 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-04-29 03:42:42,852 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-29 03:42:42,852 INFO L377 AbstractCegarLoop]: Hoare is false [2021-04-29 03:42:42,852 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-29 03:42:42,852 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-29 03:42:42,852 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-29 03:42:42,852 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-29 03:42:42,852 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-29 03:42:42,852 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-29 03:42:42,853 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 38 transitions, 241 flow [2021-04-29 03:42:42,858 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-04-29 03:42:42,859 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:42:42,859 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. [2021-04-29 03:42:42,859 INFO L82 GeneralOperation]: Start removeDead. Operand has 61 places, 38 transitions, 241 flow [2021-04-29 03:42:42,860 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 36 transitions, 237 flow [2021-04-29 03:42:42,860 INFO L171 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-04-29 03:42:42,860 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 59 places, 36 transitions, 237 flow [2021-04-29 03:42:42,861 INFO L133 LiptonReduction]: Starting Lipton reduction on Petri net that has 59 places, 36 transitions, 237 flow [2021-04-29 03:42:42,861 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 59 places, 36 transitions, 237 flow [2021-04-29 03:42:42,865 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-04-29 03:42:42,865 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:42:42,865 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. [2021-04-29 03:42:42,866 INFO L146 LiptonReduction]: Number of co-enabled transitions 748 [2021-04-29 03:42:43,323 INFO L158 LiptonReduction]: Checked pairs total: 297 [2021-04-29 03:42:43,323 INFO L160 LiptonReduction]: Total number of compositions: 11 [2021-04-29 03:42:43,323 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 463 [2021-04-29 03:42:43,325 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-04-29 03:42:43,325 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-04-29 03:42:43,325 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-04-29 03:42:43,326 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-04-29 03:42:43,326 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-04-29 03:42:43,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-29 03:42:43,326 INFO L82 PathProgramCache]: Analyzing trace with hash 10915, now seen corresponding path program 1 times [2021-04-29 03:42:43,326 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-29 03:42:43,326 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780854577] [2021-04-29 03:42:43,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-29 03:42:43,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-29 03:42:43,335 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-29 03:42:43,335 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-04-29 03:42:43,339 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-29 03:42:43,339 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780854577] [2021-04-29 03:42:43,339 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-29 03:42:43,340 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-04-29 03:42:43,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845251026] [2021-04-29 03:42:43,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-29 03:42:43,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-29 03:42:43,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-29 03:42:43,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-29 03:42:43,341 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 49 [2021-04-29 03:42:43,342 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 36 transitions, 237 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) [2021-04-29 03:42:43,342 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-04-29 03:42:43,342 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 49 [2021-04-29 03:42:43,342 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-04-29 03:50:32,604 INFO L129 PetriNetUnfolder]: 1121932/1299091 cut-off events. [2021-04-29 03:50:32,605 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown [2021-04-29 03:50:44,185 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2598271 conditions, 1299091 events. 1121932/1299091 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 81194. Compared 7099700 event pairs, 1121932 based on Foata normal form. 177158/824000 useless extension candidates. Maximal degree in co-relation 2598156. Up to 1299079 conditions per place.