/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-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-26 03:22:41,758 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-26 03:22:41,760 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-26 03:22:41,797 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-26 03:22:41,797 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-26 03:22:41,800 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-26 03:22:41,802 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-26 03:22:41,807 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-26 03:22:41,809 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-26 03:22:41,813 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-26 03:22:41,814 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-26 03:22:41,815 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2021-03-26 03:22:41,855 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 [2021-03-26 03:22:41,893 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-26 03:22:41,893 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-26 03:22:41,897 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-26 03:22:41,897 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-26 03:22:41,897 INFO L138 SettingsManager]: * Use SBE=true [2021-03-26 03:22:41,897 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-26 03:22:41,897 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-26 03:22:41,897 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-26 03:22:41,898 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-26 03:22:41,898 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-26 03:22:41,899 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-26 03:22:41,899 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-26 03:22:41,899 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-26 03:22:41,899 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-26 03:22:41,899 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-26 03:22:41,899 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-26 03:22:41,900 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-26 03:22:41,900 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-26 03:22:41,900 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-26 03:22:41,900 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-26 03:22:41,900 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-26 03:22:41,900 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-26 03:22:41,901 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-26 03:22:41,901 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-26 03:22:41,901 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-26 03:22:41,901 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-26 03:22:41,901 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-26 03:22:41,901 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=SEMANTIC_BASED_MOVER_CHECK_WITH_PREDICATES [2021-03-26 03:22:41,901 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-26 03:22:41,902 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-03-26 03:22:41,902 INFO L138 SettingsManager]: * Apply repeated Lipton Reduction=true WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-26 03:22:42,190 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-26 03:22:42,213 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-26 03:22:42,215 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-26 03:22:42,216 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-26 03:22:42,217 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-26 03:22:42,217 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl [2021-03-26 03:22:42,218 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl' [2021-03-26 03:22:42,250 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-26 03:22:42,252 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-26 03:22:42,252 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-26 03:22:42,253 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-26 03:22:42,253 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-26 03:22:42,262 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 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,267 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 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,273 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-26 03:22:42,274 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-26 03:22:42,275 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-26 03:22:42,275 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-26 03:22:42,280 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,281 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,281 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,281 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,282 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,284 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,284 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/1) ... [2021-03-26 03:22:42,285 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-26 03:22:42,285 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-26 03:22:42,285 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-26 03:22:42,286 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-26 03:22:42,286 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-26 03:22:42,349 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-26 03:22:42,351 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-26 03:22:42,351 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-26 03:22:42,351 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-03-26 03:22:42,351 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-03-26 03:22:42,351 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-03-26 03:22:42,352 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-26 03:22:42,477 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-26 03:22:42,477 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-26 03:22:42,479 INFO L202 PluginConnector]: Adding new model fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.03 03:22:42 BoogieIcfgContainer [2021-03-26 03:22:42,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-26 03:22:42,481 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-26 03:22:42,481 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-26 03:22:42,484 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-26 03:22:42,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.03 03:22:42" (1/2) ... [2021-03-26 03:22:42,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61daa788 and model type fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.03 03:22:42, skipping insertion in model container [2021-03-26 03:22:42,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.03 03:22:42" (2/2) ... [2021-03-26 03:22:42,486 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_inc.bpl [2021-03-26 03:22:42,494 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-26 03:22:42,497 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-26 03:22:42,498 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-26 03:22:42,530 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:42,546 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:42,575 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:42,577 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:42,577 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:42,578 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:42,578 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:42,578 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:42,578 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:42,578 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:42,585 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 8 transitions, 21 flow [2021-03-26 03:22:42,602 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-26 03:22:42,602 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,603 INFO L84 FinitePrefix]: Finished finitePrefix Result has 16 conditions, 11 events. 0/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 19 event pairs, 0 based on Foata normal form. 0/9 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-26 03:22:42,603 INFO L82 GeneralOperation]: Start removeDead. Operand has 11 places, 8 transitions, 21 flow [2021-03-26 03:22:42,606 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 9 places, 6 transitions, 17 flow [2021-03-26 03:22:42,607 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:42,621 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-26 03:22:42,628 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-26 03:22:42,631 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 6 transitions, 17 flow [2021-03-26 03:22:42,636 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-26 03:22:42,636 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,636 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12 conditions, 7 events. 0/7 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 8 event pairs, 0 based on Foata normal form. 0/7 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-26 03:22:42,638 INFO L142 LiptonReduction]: Number of co-enabled transitions 8 [2021-03-26 03:22:42,693 INFO L154 LiptonReduction]: Checked pairs total: 2 [2021-03-26 03:22:42,693 INFO L156 LiptonReduction]: Total number of compositions: 1 [2021-03-26 03:22:42,694 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 88 [2021-03-26 03:22:42,704 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-26 03:22:42,704 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,704 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:42,705 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:42,705 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:42,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:42,710 INFO L82 PathProgramCache]: Analyzing trace with hash 1315, now seen corresponding path program 1 times [2021-03-26 03:22:42,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:42,717 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377198527] [2021-03-26 03:22:42,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:42,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:42,800 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:42,802 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:42,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:42,810 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377198527] [2021-03-26 03:22:42,810 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:42,811 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:42,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054613877] [2021-03-26 03:22:42,817 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:42,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:42,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:42,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:42,825 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 9 [2021-03-26 03:22:42,826 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 8 places, 5 transitions, 15 flow. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,827 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:42,827 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 9 [2021-03-26 03:22:42,827 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:42,838 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-26 03:22:42,838 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,838 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12 conditions, 4 events. 0/4 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 3/7 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-26 03:22:42,839 INFO L132 encePairwiseOnDemand]: 7/9 looper letters, 1 selfloop transitions, 1 changer transitions 0/4 dead transitions. [2021-03-26 03:22:42,839 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 9 places, 4 transitions, 17 flow [2021-03-26 03:22:42,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:42,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:42,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 15 transitions. [2021-03-26 03:22:42,848 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5555555555555556 [2021-03-26 03:22:42,848 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 15 transitions. [2021-03-26 03:22:42,848 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 15 transitions. [2021-03-26 03:22:42,849 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:42,851 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 15 transitions. [2021-03-26 03:22:42,852 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,854 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,855 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,856 INFO L185 Difference]: Start difference. First operand has 8 places, 5 transitions, 15 flow. Second operand 3 states and 15 transitions. [2021-03-26 03:22:42,857 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 9 places, 4 transitions, 17 flow [2021-03-26 03:22:42,858 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 9 places, 4 transitions, 17 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:42,859 INFO L241 Difference]: Finished difference. Result has 9 places, 4 transitions, 15 flow [2021-03-26 03:22:42,861 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=9, PETRI_DIFFERENCE_MINUEND_FLOW=13, PETRI_DIFFERENCE_MINUEND_PLACES=7, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=4, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=3, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=15, PETRI_PLACES=9, PETRI_TRANSITIONS=4} [2021-03-26 03:22:42,862 INFO L343 CegarLoopForPetriNet]: 8 programPoint places, 1 predicate places. [2021-03-26 03:22:42,862 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:42,862 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 4 transitions, 15 flow [2021-03-26 03:22:42,862 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 4 transitions, 15 flow [2021-03-26 03:22:42,863 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 4 transitions, 15 flow [2021-03-26 03:22:42,864 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-26 03:22:42,864 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,864 INFO L84 FinitePrefix]: Finished finitePrefix Result has 11 conditions, 4 events. 0/4 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 0/4 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-26 03:22:42,865 INFO L142 LiptonReduction]: Number of co-enabled transitions 2 [2021-03-26 03:22:42,865 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:42,865 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:42,865 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 3 [2021-03-26 03:22:42,866 INFO L480 AbstractCegarLoop]: Abstraction has has 9 places, 4 transitions, 15 flow [2021-03-26 03:22:42,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,867 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:42,867 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-26 03:22:42,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-26 03:22:42,867 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:42,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:42,868 INFO L82 PathProgramCache]: Analyzing trace with hash 41033, now seen corresponding path program 1 times [2021-03-26 03:22:42,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:42,868 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123992268] [2021-03-26 03:22:42,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:42,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:42,871 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:42,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:42,873 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:42,883 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:42,883 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:42,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-26 03:22:42,885 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:42,885 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-26 03:22:42,890 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:42,891 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:42,892 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:42,892 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:42,893 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:42,893 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:42,893 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:42,893 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:42,893 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:42,893 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:42,894 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 16 places, 11 transitions, 34 flow [2021-03-26 03:22:42,898 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-26 03:22:42,898 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,898 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 17 events. 0/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 38 event pairs, 0 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-26 03:22:42,898 INFO L82 GeneralOperation]: Start removeDead. Operand has 16 places, 11 transitions, 34 flow [2021-03-26 03:22:42,898 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 9 transitions, 30 flow [2021-03-26 03:22:42,898 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:42,899 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-26 03:22:42,899 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-26 03:22:42,899 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 14 places, 9 transitions, 30 flow [2021-03-26 03:22:42,901 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-26 03:22:42,901 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,901 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. [2021-03-26 03:22:42,902 INFO L142 LiptonReduction]: Number of co-enabled transitions 28 [2021-03-26 03:22:42,938 INFO L154 LiptonReduction]: Checked pairs total: 9 [2021-03-26 03:22:42,938 INFO L156 LiptonReduction]: Total number of compositions: 2 [2021-03-26 03:22:42,938 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 40 [2021-03-26 03:22:42,940 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:22:42,940 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,940 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:42,940 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:42,940 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:42,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:42,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1699, now seen corresponding path program 1 times [2021-03-26 03:22:42,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:42,941 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035606674] [2021-03-26 03:22:42,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:42,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:42,947 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:42,947 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:42,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:42,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035606674] [2021-03-26 03:22:42,951 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:42,951 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:42,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999497374] [2021-03-26 03:22:42,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:42,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:42,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:42,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:42,953 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 13 [2021-03-26 03:22:42,953 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 12 places, 7 transitions, 26 flow. Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,953 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:42,953 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 13 [2021-03-26 03:22:42,954 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:42,961 INFO L129 PetriNetUnfolder]: 1/8 cut-off events. [2021-03-26 03:22:42,961 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,962 INFO L84 FinitePrefix]: Finished finitePrefix Result has 24 conditions, 8 events. 1/8 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 6 event pairs, 1 based on Foata normal form. 6/13 useless extension candidates. Maximal degree in co-relation 9. Up to 5 conditions per place. [2021-03-26 03:22:42,962 INFO L132 encePairwiseOnDemand]: 11/13 looper letters, 2 selfloop transitions, 1 changer transitions 0/6 dead transitions. [2021-03-26 03:22:42,962 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 13 places, 6 transitions, 30 flow [2021-03-26 03:22:42,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:42,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:42,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 22 transitions. [2021-03-26 03:22:42,964 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5641025641025641 [2021-03-26 03:22:42,964 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 22 transitions. [2021-03-26 03:22:42,964 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 22 transitions. [2021-03-26 03:22:42,964 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:42,964 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 22 transitions. [2021-03-26 03:22:42,965 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,965 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,965 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,966 INFO L185 Difference]: Start difference. First operand has 12 places, 7 transitions, 26 flow. Second operand 3 states and 22 transitions. [2021-03-26 03:22:42,966 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 13 places, 6 transitions, 30 flow [2021-03-26 03:22:42,966 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 13 places, 6 transitions, 28 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:42,967 INFO L241 Difference]: Finished difference. Result has 13 places, 6 transitions, 24 flow [2021-03-26 03:22:42,967 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=13, PETRI_DIFFERENCE_MINUEND_FLOW=22, PETRI_DIFFERENCE_MINUEND_PLACES=11, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=6, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=5, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=24, PETRI_PLACES=13, PETRI_TRANSITIONS=6} [2021-03-26 03:22:42,967 INFO L343 CegarLoopForPetriNet]: 12 programPoint places, 1 predicate places. [2021-03-26 03:22:42,967 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:42,967 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 13 places, 6 transitions, 24 flow [2021-03-26 03:22:42,968 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 13 places, 6 transitions, 24 flow [2021-03-26 03:22:42,968 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 6 transitions, 24 flow [2021-03-26 03:22:42,970 INFO L129 PetriNetUnfolder]: 0/6 cut-off events. [2021-03-26 03:22:42,970 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:42,970 INFO L84 FinitePrefix]: Finished finitePrefix Result has 17 conditions, 6 events. 0/6 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 2 event pairs, 0 based on Foata normal form. 0/6 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-26 03:22:42,970 INFO L142 LiptonReduction]: Number of co-enabled transitions 8 [2021-03-26 03:22:42,971 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:42,971 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:42,971 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-26 03:22:42,972 INFO L480 AbstractCegarLoop]: Abstraction has has 13 places, 6 transitions, 24 flow [2021-03-26 03:22:42,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:42,972 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:42,972 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-26 03:22:42,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-26 03:22:42,972 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:42,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:42,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1643499, now seen corresponding path program 1 times [2021-03-26 03:22:42,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:42,973 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118963896] [2021-03-26 03:22:42,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:42,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:42,980 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:42,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:42,985 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:42,986 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:42,986 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:42,986 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-26 03:22:42,986 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:42,987 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-26 03:22:43,005 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:43,005 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:43,014 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:43,014 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:43,014 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:43,014 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:43,014 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:43,014 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:43,014 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:43,014 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:43,015 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 14 transitions, 49 flow [2021-03-26 03:22:43,019 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-26 03:22:43,019 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,020 INFO L84 FinitePrefix]: Finished finitePrefix Result has 39 conditions, 23 events. 0/23 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 65 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-26 03:22:43,020 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 14 transitions, 49 flow [2021-03-26 03:22:43,020 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 19 places, 12 transitions, 45 flow [2021-03-26 03:22:43,020 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,020 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-26 03:22:43,021 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-26 03:22:43,021 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 19 places, 12 transitions, 45 flow [2021-03-26 03:22:43,024 INFO L129 PetriNetUnfolder]: 0/15 cut-off events. [2021-03-26 03:22:43,024 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,024 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 15 events. 0/15 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 23 event pairs, 0 based on Foata normal form. 0/15 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-26 03:22:43,024 INFO L142 LiptonReduction]: Number of co-enabled transitions 60 [2021-03-26 03:22:43,151 INFO L154 LiptonReduction]: Checked pairs total: 21 [2021-03-26 03:22:43,152 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-26 03:22:43,152 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 132 [2021-03-26 03:22:43,154 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:22:43,154 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,154 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:43,154 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:43,154 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:43,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:43,155 INFO L82 PathProgramCache]: Analyzing trace with hash 2211, now seen corresponding path program 1 times [2021-03-26 03:22:43,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:43,155 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211971553] [2021-03-26 03:22:43,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:43,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:43,162 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:43,162 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:43,165 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:43,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211971553] [2021-03-26 03:22:43,165 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:43,165 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:43,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229755693] [2021-03-26 03:22:43,166 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:43,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:43,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:43,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:43,167 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 17 [2021-03-26 03:22:43,167 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 16 places, 9 transitions, 39 flow. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,167 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:43,167 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 17 [2021-03-26 03:22:43,168 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:43,189 INFO L129 PetriNetUnfolder]: 5/17 cut-off events. [2021-03-26 03:22:43,189 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,189 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47 conditions, 17 events. 5/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 30 event pairs, 5 based on Foata normal form. 11/25 useless extension candidates. Maximal degree in co-relation 24. Up to 13 conditions per place. [2021-03-26 03:22:43,190 INFO L132 encePairwiseOnDemand]: 15/17 looper letters, 3 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2021-03-26 03:22:43,190 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 8 transitions, 45 flow [2021-03-26 03:22:43,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:43,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:43,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 29 transitions. [2021-03-26 03:22:43,196 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5686274509803921 [2021-03-26 03:22:43,197 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 29 transitions. [2021-03-26 03:22:43,197 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 29 transitions. [2021-03-26 03:22:43,197 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:43,197 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 29 transitions. [2021-03-26 03:22:43,197 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,198 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,198 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,198 INFO L185 Difference]: Start difference. First operand has 16 places, 9 transitions, 39 flow. Second operand 3 states and 29 transitions. [2021-03-26 03:22:43,198 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 8 transitions, 45 flow [2021-03-26 03:22:43,199 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 17 places, 8 transitions, 39 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:43,200 INFO L241 Difference]: Finished difference. Result has 17 places, 8 transitions, 33 flow [2021-03-26 03:22:43,200 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=17, PETRI_DIFFERENCE_MINUEND_FLOW=31, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=33, PETRI_PLACES=17, PETRI_TRANSITIONS=8} [2021-03-26 03:22:43,200 INFO L343 CegarLoopForPetriNet]: 16 programPoint places, 1 predicate places. [2021-03-26 03:22:43,200 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,200 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 17 places, 8 transitions, 33 flow [2021-03-26 03:22:43,201 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 17 places, 8 transitions, 33 flow [2021-03-26 03:22:43,201 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 17 places, 8 transitions, 33 flow [2021-03-26 03:22:43,203 INFO L129 PetriNetUnfolder]: 0/8 cut-off events. [2021-03-26 03:22:43,203 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,203 INFO L84 FinitePrefix]: Finished finitePrefix Result has 23 conditions, 8 events. 0/8 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 3 event pairs, 0 based on Foata normal form. 0/8 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-26 03:22:43,203 INFO L142 LiptonReduction]: Number of co-enabled transitions 18 [2021-03-26 03:22:43,204 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:43,204 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:43,204 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-26 03:22:43,205 INFO L480 AbstractCegarLoop]: Abstraction has has 17 places, 8 transitions, 33 flow [2021-03-26 03:22:43,205 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,205 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:43,205 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-03-26 03:22:43,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-26 03:22:43,206 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:43,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:43,206 INFO L82 PathProgramCache]: Analyzing trace with hash 66279044, now seen corresponding path program 1 times [2021-03-26 03:22:43,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:43,206 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249308239] [2021-03-26 03:22:43,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:43,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:43,210 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:43,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:43,224 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:43,226 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:43,226 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:43,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-26 03:22:43,227 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:43,227 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-26 03:22:43,240 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:43,240 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:43,241 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:43,241 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:43,241 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:43,241 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:43,242 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:43,242 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:43,242 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:43,242 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:43,243 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 17 transitions, 66 flow [2021-03-26 03:22:43,248 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-03-26 03:22:43,248 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,248 INFO L84 FinitePrefix]: Finished finitePrefix Result has 52 conditions, 29 events. 0/29 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 91 event pairs, 0 based on Foata normal form. 0/24 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-26 03:22:43,248 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 17 transitions, 66 flow [2021-03-26 03:22:43,249 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 15 transitions, 62 flow [2021-03-26 03:22:43,249 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,249 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-26 03:22:43,249 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-26 03:22:43,249 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 15 transitions, 62 flow [2021-03-26 03:22:43,261 INFO L129 PetriNetUnfolder]: 0/19 cut-off events. [2021-03-26 03:22:43,261 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,263 INFO L84 FinitePrefix]: Finished finitePrefix Result has 42 conditions, 19 events. 0/19 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 29 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-26 03:22:43,264 INFO L142 LiptonReduction]: Number of co-enabled transitions 104 [2021-03-26 03:22:43,338 INFO L154 LiptonReduction]: Checked pairs total: 38 [2021-03-26 03:22:43,339 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-26 03:22:43,339 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 90 [2021-03-26 03:22:43,343 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:22:43,343 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,343 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:43,343 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:43,343 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:43,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:43,344 INFO L82 PathProgramCache]: Analyzing trace with hash 2851, now seen corresponding path program 1 times [2021-03-26 03:22:43,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:43,344 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260346747] [2021-03-26 03:22:43,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:43,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:43,349 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:43,350 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:43,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:43,353 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260346747] [2021-03-26 03:22:43,353 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:43,353 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:43,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947802194] [2021-03-26 03:22:43,353 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:43,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:43,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:43,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:43,355 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 21 [2021-03-26 03:22:43,355 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 11 transitions, 54 flow. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,355 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:43,355 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 21 [2021-03-26 03:22:43,355 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:43,372 INFO L129 PetriNetUnfolder]: 17/38 cut-off events. [2021-03-26 03:22:43,372 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,373 INFO L84 FinitePrefix]: Finished finitePrefix Result has 95 conditions, 38 events. 17/38 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 111 event pairs, 17 based on Foata normal form. 20/52 useless extension candidates. Maximal degree in co-relation 64. Up to 33 conditions per place. [2021-03-26 03:22:43,373 INFO L132 encePairwiseOnDemand]: 19/21 looper letters, 4 selfloop transitions, 1 changer transitions 0/10 dead transitions. [2021-03-26 03:22:43,374 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 10 transitions, 62 flow [2021-03-26 03:22:43,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:43,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:43,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 36 transitions. [2021-03-26 03:22:43,376 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5714285714285714 [2021-03-26 03:22:43,376 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 36 transitions. [2021-03-26 03:22:43,376 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 36 transitions. [2021-03-26 03:22:43,376 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:43,376 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 36 transitions. [2021-03-26 03:22:43,377 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,378 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,378 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,378 INFO L185 Difference]: Start difference. First operand has 20 places, 11 transitions, 54 flow. Second operand 3 states and 36 transitions. [2021-03-26 03:22:43,378 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 10 transitions, 62 flow [2021-03-26 03:22:43,379 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 10 transitions, 50 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:43,379 INFO L241 Difference]: Finished difference. Result has 21 places, 10 transitions, 42 flow [2021-03-26 03:22:43,380 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=21, PETRI_DIFFERENCE_MINUEND_FLOW=40, PETRI_DIFFERENCE_MINUEND_PLACES=19, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=42, PETRI_PLACES=21, PETRI_TRANSITIONS=10} [2021-03-26 03:22:43,380 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 1 predicate places. [2021-03-26 03:22:43,380 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,380 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 21 places, 10 transitions, 42 flow [2021-03-26 03:22:43,380 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 21 places, 10 transitions, 42 flow [2021-03-26 03:22:43,381 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 10 transitions, 42 flow [2021-03-26 03:22:43,383 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-03-26 03:22:43,383 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,383 INFO L84 FinitePrefix]: Finished finitePrefix Result has 29 conditions, 10 events. 0/10 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 8 event pairs, 0 based on Foata normal form. 0/10 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-26 03:22:43,383 INFO L142 LiptonReduction]: Number of co-enabled transitions 32 [2021-03-26 03:22:43,384 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:43,384 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:43,384 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-26 03:22:43,385 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 10 transitions, 42 flow [2021-03-26 03:22:43,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,386 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:43,386 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-26 03:22:43,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-26 03:22:43,386 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:43,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:43,386 INFO L82 PathProgramCache]: Analyzing trace with hash -1646739026, now seen corresponding path program 1 times [2021-03-26 03:22:43,387 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:43,387 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497720292] [2021-03-26 03:22:43,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:43,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:43,390 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:43,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:43,393 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:43,394 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:43,394 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:43,394 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-26 03:22:43,394 WARN L342 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:43,395 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-03-26 03:22:43,402 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:43,403 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:43,404 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:43,404 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:43,404 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:43,404 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:43,404 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:43,404 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:43,404 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:43,404 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:43,405 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 20 transitions, 85 flow [2021-03-26 03:22:43,410 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-26 03:22:43,410 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,411 INFO L84 FinitePrefix]: Finished finitePrefix Result has 66 conditions, 35 events. 0/35 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 111 event pairs, 0 based on Foata normal form. 0/29 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-26 03:22:43,411 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 20 transitions, 85 flow [2021-03-26 03:22:43,411 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 18 transitions, 81 flow [2021-03-26 03:22:43,411 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,412 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-26 03:22:43,412 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-26 03:22:43,412 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 18 transitions, 81 flow [2021-03-26 03:22:43,416 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-26 03:22:43,416 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,416 INFO L84 FinitePrefix]: Finished finitePrefix Result has 54 conditions, 23 events. 0/23 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 54 event pairs, 0 based on Foata normal form. 0/23 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-26 03:22:43,417 INFO L142 LiptonReduction]: Number of co-enabled transitions 160 [2021-03-26 03:22:43,531 INFO L154 LiptonReduction]: Checked pairs total: 60 [2021-03-26 03:22:43,531 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-26 03:22:43,531 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 120 [2021-03-26 03:22:43,533 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-26 03:22:43,533 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,533 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:43,533 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:43,534 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:43,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:43,534 INFO L82 PathProgramCache]: Analyzing trace with hash 3619, now seen corresponding path program 1 times [2021-03-26 03:22:43,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:43,534 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209173136] [2021-03-26 03:22:43,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:43,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:43,540 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:43,540 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:43,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:43,543 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209173136] [2021-03-26 03:22:43,543 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:43,543 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:43,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679397584] [2021-03-26 03:22:43,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:43,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:43,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:43,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:43,545 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-03-26 03:22:43,545 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 13 transitions, 71 flow. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,545 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:43,545 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-03-26 03:22:43,545 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:43,568 INFO L129 PetriNetUnfolder]: 49/87 cut-off events. [2021-03-26 03:22:43,569 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,569 INFO L84 FinitePrefix]: Finished finitePrefix Result has 200 conditions, 87 events. 49/87 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 316 event pairs, 49 based on Foata normal form. 37/111 useless extension candidates. Maximal degree in co-relation 160. Up to 81 conditions per place. [2021-03-26 03:22:43,570 INFO L132 encePairwiseOnDemand]: 23/25 looper letters, 5 selfloop transitions, 1 changer transitions 0/12 dead transitions. [2021-03-26 03:22:43,570 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 12 transitions, 81 flow [2021-03-26 03:22:43,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:43,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:43,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 43 transitions. [2021-03-26 03:22:43,577 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5733333333333334 [2021-03-26 03:22:43,577 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 43 transitions. [2021-03-26 03:22:43,577 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 43 transitions. [2021-03-26 03:22:43,577 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:43,577 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 43 transitions. [2021-03-26 03:22:43,578 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,578 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,578 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,579 INFO L185 Difference]: Start difference. First operand has 24 places, 13 transitions, 71 flow. Second operand 3 states and 43 transitions. [2021-03-26 03:22:43,579 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 12 transitions, 81 flow [2021-03-26 03:22:43,580 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 12 transitions, 61 flow, removed 10 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:43,581 INFO L241 Difference]: Finished difference. Result has 25 places, 12 transitions, 51 flow [2021-03-26 03:22:43,581 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=25, PETRI_DIFFERENCE_MINUEND_FLOW=49, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=51, PETRI_PLACES=25, PETRI_TRANSITIONS=12} [2021-03-26 03:22:43,581 INFO L343 CegarLoopForPetriNet]: 24 programPoint places, 1 predicate places. [2021-03-26 03:22:43,581 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,581 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 25 places, 12 transitions, 51 flow [2021-03-26 03:22:43,582 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 25 places, 12 transitions, 51 flow [2021-03-26 03:22:43,582 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 25 places, 12 transitions, 51 flow [2021-03-26 03:22:43,584 INFO L129 PetriNetUnfolder]: 0/12 cut-off events. [2021-03-26 03:22:43,584 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,584 INFO L84 FinitePrefix]: Finished finitePrefix Result has 35 conditions, 12 events. 0/12 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 9 event pairs, 0 based on Foata normal form. 0/12 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-26 03:22:43,585 INFO L142 LiptonReduction]: Number of co-enabled transitions 50 [2021-03-26 03:22:43,586 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:43,586 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:43,586 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-26 03:22:43,587 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 12 transitions, 51 flow [2021-03-26 03:22:43,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,587 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:43,587 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:43,587 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-26 03:22:43,587 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:43,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:43,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1085119695, now seen corresponding path program 1 times [2021-03-26 03:22:43,592 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:43,592 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331861233] [2021-03-26 03:22:43,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:43,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:43,606 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:43,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:43,609 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:43,610 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:43,610 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:43,611 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-26 03:22:43,611 WARN L342 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:43,611 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-03-26 03:22:43,624 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:43,625 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:43,626 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:43,626 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:43,626 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:43,626 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:43,626 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:43,626 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:43,626 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:43,626 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:43,629 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 36 places, 23 transitions, 106 flow [2021-03-26 03:22:43,638 INFO L129 PetriNetUnfolder]: 0/41 cut-off events. [2021-03-26 03:22:43,639 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,639 INFO L84 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 41 events. 0/41 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 136 event pairs, 0 based on Foata normal form. 0/34 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-26 03:22:43,639 INFO L82 GeneralOperation]: Start removeDead. Operand has 36 places, 23 transitions, 106 flow [2021-03-26 03:22:43,642 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 21 transitions, 102 flow [2021-03-26 03:22:43,642 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,642 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-26 03:22:43,642 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-26 03:22:43,644 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 21 transitions, 102 flow [2021-03-26 03:22:43,649 INFO L129 PetriNetUnfolder]: 0/27 cut-off events. [2021-03-26 03:22:43,649 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,649 INFO L84 FinitePrefix]: Finished finitePrefix Result has 67 conditions, 27 events. 0/27 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 59 event pairs, 0 based on Foata normal form. 0/27 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-26 03:22:43,649 INFO L142 LiptonReduction]: Number of co-enabled transitions 228 [2021-03-26 03:22:43,810 INFO L154 LiptonReduction]: Checked pairs total: 87 [2021-03-26 03:22:43,810 INFO L156 LiptonReduction]: Total number of compositions: 6 [2021-03-26 03:22:43,811 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 169 [2021-03-26 03:22:43,812 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:22:43,812 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,812 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:43,812 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:43,813 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:43,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:43,813 INFO L82 PathProgramCache]: Analyzing trace with hash 4515, now seen corresponding path program 1 times [2021-03-26 03:22:43,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:43,813 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722503605] [2021-03-26 03:22:43,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:43,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:43,822 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:43,822 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:43,826 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:43,826 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722503605] [2021-03-26 03:22:43,826 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:43,826 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:43,826 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174064385] [2021-03-26 03:22:43,826 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:43,827 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:43,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:43,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:43,827 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 29 [2021-03-26 03:22:43,828 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 15 transitions, 90 flow. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,828 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:43,828 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 29 [2021-03-26 03:22:43,828 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:43,880 INFO L129 PetriNetUnfolder]: 129/200 cut-off events. [2021-03-26 03:22:43,880 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,881 INFO L84 FinitePrefix]: Finished finitePrefix Result has 434 conditions, 200 events. 129/200 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 32. Compared 780 event pairs, 129 based on Foata normal form. 70/246 useless extension candidates. Maximal degree in co-relation 384. Up to 193 conditions per place. [2021-03-26 03:22:43,882 INFO L132 encePairwiseOnDemand]: 27/29 looper letters, 6 selfloop transitions, 1 changer transitions 0/14 dead transitions. [2021-03-26 03:22:43,882 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 14 transitions, 102 flow [2021-03-26 03:22:43,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:43,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:43,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 50 transitions. [2021-03-26 03:22:43,892 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5747126436781609 [2021-03-26 03:22:43,892 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 50 transitions. [2021-03-26 03:22:43,892 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 50 transitions. [2021-03-26 03:22:43,893 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:43,893 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 50 transitions. [2021-03-26 03:22:43,893 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,894 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,894 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,894 INFO L185 Difference]: Start difference. First operand has 28 places, 15 transitions, 90 flow. Second operand 3 states and 50 transitions. [2021-03-26 03:22:43,894 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 14 transitions, 102 flow [2021-03-26 03:22:43,895 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 14 transitions, 72 flow, removed 15 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:43,895 INFO L241 Difference]: Finished difference. Result has 29 places, 14 transitions, 60 flow [2021-03-26 03:22:43,896 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=58, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=14, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=60, PETRI_PLACES=29, PETRI_TRANSITIONS=14} [2021-03-26 03:22:43,896 INFO L343 CegarLoopForPetriNet]: 28 programPoint places, 1 predicate places. [2021-03-26 03:22:43,896 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,896 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 14 transitions, 60 flow [2021-03-26 03:22:43,896 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 14 transitions, 60 flow [2021-03-26 03:22:43,897 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 14 transitions, 60 flow [2021-03-26 03:22:43,898 INFO L129 PetriNetUnfolder]: 0/14 cut-off events. [2021-03-26 03:22:43,898 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,898 INFO L84 FinitePrefix]: Finished finitePrefix Result has 41 conditions, 14 events. 0/14 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 6 event pairs, 0 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-26 03:22:43,898 INFO L142 LiptonReduction]: Number of co-enabled transitions 72 [2021-03-26 03:22:43,899 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:43,899 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:43,899 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 3 [2021-03-26 03:22:43,900 INFO L480 AbstractCegarLoop]: Abstraction has has 29 places, 14 transitions, 60 flow [2021-03-26 03:22:43,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:43,900 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:43,900 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:43,900 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-26 03:22:43,900 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:43,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:43,901 INFO L82 PathProgramCache]: Analyzing trace with hash -1719135375, now seen corresponding path program 1 times [2021-03-26 03:22:43,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:43,901 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933095320] [2021-03-26 03:22:43,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:43,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:43,904 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:43,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:43,906 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:43,913 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:43,913 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:43,914 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-03-26 03:22:43,915 WARN L342 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:43,919 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-03-26 03:22:43,934 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:43,934 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:43,936 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:43,941 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:43,941 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:43,941 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:43,941 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:43,941 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:43,941 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:43,941 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:43,942 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 26 transitions, 129 flow [2021-03-26 03:22:43,945 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-26 03:22:43,945 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,945 INFO L84 FinitePrefix]: Finished finitePrefix Result has 97 conditions, 47 events. 0/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 166 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-26 03:22:43,945 INFO L82 GeneralOperation]: Start removeDead. Operand has 41 places, 26 transitions, 129 flow [2021-03-26 03:22:43,946 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 39 places, 24 transitions, 125 flow [2021-03-26 03:22:43,946 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:43,946 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-26 03:22:43,946 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-26 03:22:43,946 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 39 places, 24 transitions, 125 flow [2021-03-26 03:22:43,948 INFO L129 PetriNetUnfolder]: 0/31 cut-off events. [2021-03-26 03:22:43,948 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:43,949 INFO L84 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 31 events. 0/31 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 86 event pairs, 0 based on Foata normal form. 0/31 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-26 03:22:43,949 INFO L142 LiptonReduction]: Number of co-enabled transitions 308 [2021-03-26 03:22:44,122 INFO L154 LiptonReduction]: Checked pairs total: 119 [2021-03-26 03:22:44,123 INFO L156 LiptonReduction]: Total number of compositions: 7 [2021-03-26 03:22:44,123 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 177 [2021-03-26 03:22:44,125 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:22:44,125 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,126 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:44,126 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:44,126 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:44,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:44,126 INFO L82 PathProgramCache]: Analyzing trace with hash 5539, now seen corresponding path program 1 times [2021-03-26 03:22:44,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:44,126 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981371325] [2021-03-26 03:22:44,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:44,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:44,137 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:44,137 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:44,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:44,141 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981371325] [2021-03-26 03:22:44,141 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:44,141 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:44,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68127410] [2021-03-26 03:22:44,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:44,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:44,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:44,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:44,144 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 33 [2021-03-26 03:22:44,145 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 17 transitions, 111 flow. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,145 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:44,145 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 33 [2021-03-26 03:22:44,145 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:44,208 INFO L129 PetriNetUnfolder]: 321/457 cut-off events. [2021-03-26 03:22:44,208 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,212 INFO L84 FinitePrefix]: Finished finitePrefix Result has 957 conditions, 457 events. 321/457 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 61. Compared 1914 event pairs, 321 based on Foata normal form. 135/549 useless extension candidates. Maximal degree in co-relation 896. Up to 449 conditions per place. [2021-03-26 03:22:44,216 INFO L132 encePairwiseOnDemand]: 31/33 looper letters, 7 selfloop transitions, 1 changer transitions 0/16 dead transitions. [2021-03-26 03:22:44,216 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 16 transitions, 125 flow [2021-03-26 03:22:44,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:44,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:44,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 57 transitions. [2021-03-26 03:22:44,219 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5757575757575758 [2021-03-26 03:22:44,220 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 57 transitions. [2021-03-26 03:22:44,220 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 57 transitions. [2021-03-26 03:22:44,220 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:44,220 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 57 transitions. [2021-03-26 03:22:44,221 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,222 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,222 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,222 INFO L185 Difference]: Start difference. First operand has 32 places, 17 transitions, 111 flow. Second operand 3 states and 57 transitions. [2021-03-26 03:22:44,222 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 16 transitions, 125 flow [2021-03-26 03:22:44,225 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 16 transitions, 83 flow, removed 21 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:44,226 INFO L241 Difference]: Finished difference. Result has 33 places, 16 transitions, 69 flow [2021-03-26 03:22:44,226 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=33, PETRI_DIFFERENCE_MINUEND_FLOW=67, PETRI_DIFFERENCE_MINUEND_PLACES=31, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=69, PETRI_PLACES=33, PETRI_TRANSITIONS=16} [2021-03-26 03:22:44,226 INFO L343 CegarLoopForPetriNet]: 32 programPoint places, 1 predicate places. [2021-03-26 03:22:44,226 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:44,226 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 33 places, 16 transitions, 69 flow [2021-03-26 03:22:44,227 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 33 places, 16 transitions, 69 flow [2021-03-26 03:22:44,227 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 33 places, 16 transitions, 69 flow [2021-03-26 03:22:44,242 INFO L129 PetriNetUnfolder]: 0/16 cut-off events. [2021-03-26 03:22:44,242 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,242 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47 conditions, 16 events. 0/16 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 19 event pairs, 0 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-26 03:22:44,242 INFO L142 LiptonReduction]: Number of co-enabled transitions 98 [2021-03-26 03:22:44,243 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:44,243 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:44,244 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 18 [2021-03-26 03:22:44,246 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 16 transitions, 69 flow [2021-03-26 03:22:44,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,246 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:44,246 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:44,246 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-03-26 03:22:44,246 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:44,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:44,247 INFO L82 PathProgramCache]: Analyzing trace with hash 779611434, now seen corresponding path program 1 times [2021-03-26 03:22:44,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:44,247 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684172572] [2021-03-26 03:22:44,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:44,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:44,262 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:44,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:44,268 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:44,270 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:44,270 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:44,270 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-03-26 03:22:44,271 WARN L342 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:44,271 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2021-03-26 03:22:44,294 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:44,295 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:44,296 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:44,296 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:44,296 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:44,296 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:44,296 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:44,296 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:44,296 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:44,296 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:44,297 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 29 transitions, 154 flow [2021-03-26 03:22:44,300 INFO L129 PetriNetUnfolder]: 0/53 cut-off events. [2021-03-26 03:22:44,301 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,301 INFO L84 FinitePrefix]: Finished finitePrefix Result has 114 conditions, 53 events. 0/53 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 191 event pairs, 0 based on Foata normal form. 0/44 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-26 03:22:44,301 INFO L82 GeneralOperation]: Start removeDead. Operand has 46 places, 29 transitions, 154 flow [2021-03-26 03:22:44,301 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 44 places, 27 transitions, 150 flow [2021-03-26 03:22:44,301 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:44,302 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-26 03:22:44,302 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-26 03:22:44,302 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 44 places, 27 transitions, 150 flow [2021-03-26 03:22:44,305 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-26 03:22:44,305 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,305 INFO L84 FinitePrefix]: Finished finitePrefix Result has 96 conditions, 35 events. 0/35 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 73 event pairs, 0 based on Foata normal form. 0/35 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-26 03:22:44,306 INFO L142 LiptonReduction]: Number of co-enabled transitions 400 [2021-03-26 03:22:44,489 INFO L154 LiptonReduction]: Checked pairs total: 156 [2021-03-26 03:22:44,489 INFO L156 LiptonReduction]: Total number of compositions: 8 [2021-03-26 03:22:44,489 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 188 [2021-03-26 03:22:44,490 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:22:44,490 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,490 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:44,490 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:44,490 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:44,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:44,491 INFO L82 PathProgramCache]: Analyzing trace with hash 6691, now seen corresponding path program 1 times [2021-03-26 03:22:44,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:44,491 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866718824] [2021-03-26 03:22:44,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:44,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:44,505 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:44,505 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:44,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:44,508 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866718824] [2021-03-26 03:22:44,509 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:44,509 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:44,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965946749] [2021-03-26 03:22:44,510 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:44,510 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:44,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:44,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:44,512 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 37 [2021-03-26 03:22:44,512 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 19 transitions, 134 flow. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,512 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:44,512 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 37 [2021-03-26 03:22:44,512 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:44,606 INFO L129 PetriNetUnfolder]: 769/1034 cut-off events. [2021-03-26 03:22:44,606 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,610 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2121 conditions, 1034 events. 769/1034 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 4476 event pairs, 769 based on Foata normal form. 264/1223 useless extension candidates. Maximal degree in co-relation 2048. Up to 1025 conditions per place. [2021-03-26 03:22:44,616 INFO L132 encePairwiseOnDemand]: 35/37 looper letters, 8 selfloop transitions, 1 changer transitions 0/18 dead transitions. [2021-03-26 03:22:44,616 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 18 transitions, 150 flow [2021-03-26 03:22:44,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:44,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:44,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 64 transitions. [2021-03-26 03:22:44,619 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5765765765765766 [2021-03-26 03:22:44,619 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 64 transitions. [2021-03-26 03:22:44,619 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 64 transitions. [2021-03-26 03:22:44,619 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:44,619 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 64 transitions. [2021-03-26 03:22:44,620 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,621 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,621 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,621 INFO L185 Difference]: Start difference. First operand has 36 places, 19 transitions, 134 flow. Second operand 3 states and 64 transitions. [2021-03-26 03:22:44,621 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 18 transitions, 150 flow [2021-03-26 03:22:44,622 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 18 transitions, 94 flow, removed 28 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:44,622 INFO L241 Difference]: Finished difference. Result has 37 places, 18 transitions, 78 flow [2021-03-26 03:22:44,623 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=37, PETRI_DIFFERENCE_MINUEND_FLOW=76, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=78, PETRI_PLACES=37, PETRI_TRANSITIONS=18} [2021-03-26 03:22:44,623 INFO L343 CegarLoopForPetriNet]: 36 programPoint places, 1 predicate places. [2021-03-26 03:22:44,623 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:44,623 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 37 places, 18 transitions, 78 flow [2021-03-26 03:22:44,623 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 37 places, 18 transitions, 78 flow [2021-03-26 03:22:44,624 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 37 places, 18 transitions, 78 flow [2021-03-26 03:22:44,625 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-26 03:22:44,625 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,625 INFO L84 FinitePrefix]: Finished finitePrefix Result has 53 conditions, 18 events. 0/18 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 20 event pairs, 0 based on Foata normal form. 0/18 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-26 03:22:44,626 INFO L142 LiptonReduction]: Number of co-enabled transitions 128 [2021-03-26 03:22:44,627 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:44,627 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:44,627 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-26 03:22:44,627 INFO L480 AbstractCegarLoop]: Abstraction has has 37 places, 18 transitions, 78 flow [2021-03-26 03:22:44,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,628 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:44,628 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:44,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-03-26 03:22:44,628 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:44,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:44,628 INFO L82 PathProgramCache]: Analyzing trace with hash -2053304524, now seen corresponding path program 1 times [2021-03-26 03:22:44,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:44,628 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387529847] [2021-03-26 03:22:44,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:44,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:44,632 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:44,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:44,635 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:44,636 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:44,637 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:44,637 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-03-26 03:22:44,637 WARN L342 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:44,637 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2021-03-26 03:22:44,648 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:44,649 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:44,650 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:44,650 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:44,650 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:44,650 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:44,650 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:44,650 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:44,650 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:44,650 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:44,651 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 51 places, 32 transitions, 181 flow [2021-03-26 03:22:44,654 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-26 03:22:44,655 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,655 INFO L84 FinitePrefix]: Finished finitePrefix Result has 132 conditions, 59 events. 0/59 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 212 event pairs, 0 based on Foata normal form. 0/49 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-26 03:22:44,655 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 32 transitions, 181 flow [2021-03-26 03:22:44,655 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 30 transitions, 177 flow [2021-03-26 03:22:44,655 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:44,655 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-26 03:22:44,656 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-26 03:22:44,656 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 30 transitions, 177 flow [2021-03-26 03:22:44,659 INFO L129 PetriNetUnfolder]: 0/39 cut-off events. [2021-03-26 03:22:44,659 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,659 INFO L84 FinitePrefix]: Finished finitePrefix Result has 112 conditions, 39 events. 0/39 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 100 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-26 03:22:44,660 INFO L142 LiptonReduction]: Number of co-enabled transitions 504 [2021-03-26 03:22:44,902 INFO L154 LiptonReduction]: Checked pairs total: 198 [2021-03-26 03:22:44,902 INFO L156 LiptonReduction]: Total number of compositions: 9 [2021-03-26 03:22:44,902 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 247 [2021-03-26 03:22:44,903 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-26 03:22:44,903 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:44,904 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:44,904 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:44,904 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:44,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:44,904 INFO L82 PathProgramCache]: Analyzing trace with hash 7971, now seen corresponding path program 1 times [2021-03-26 03:22:44,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:44,904 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113398608] [2021-03-26 03:22:44,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:44,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:44,913 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:44,913 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:44,915 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:44,915 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113398608] [2021-03-26 03:22:44,915 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:44,916 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:44,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237791389] [2021-03-26 03:22:44,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:44,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:44,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:44,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:44,917 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 41 [2021-03-26 03:22:44,917 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 40 places, 21 transitions, 159 flow. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:44,917 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:44,917 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 41 [2021-03-26 03:22:44,917 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:45,098 INFO L129 PetriNetUnfolder]: 1793/2315 cut-off events. [2021-03-26 03:22:45,099 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:45,107 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4694 conditions, 2315 events. 1793/2315 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 233. Compared 10434 event pairs, 1793 based on Foata normal form. 521/2705 useless extension candidates. Maximal degree in co-relation 4608. Up to 2305 conditions per place. [2021-03-26 03:22:45,122 INFO L132 encePairwiseOnDemand]: 39/41 looper letters, 9 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2021-03-26 03:22:45,122 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 20 transitions, 177 flow [2021-03-26 03:22:45,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:45,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:45,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 71 transitions. [2021-03-26 03:22:45,124 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5772357723577236 [2021-03-26 03:22:45,124 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 71 transitions. [2021-03-26 03:22:45,124 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 71 transitions. [2021-03-26 03:22:45,124 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:45,124 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 71 transitions. [2021-03-26 03:22:45,124 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,126 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,126 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,126 INFO L185 Difference]: Start difference. First operand has 40 places, 21 transitions, 159 flow. Second operand 3 states and 71 transitions. [2021-03-26 03:22:45,126 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 20 transitions, 177 flow [2021-03-26 03:22:45,129 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 20 transitions, 105 flow, removed 36 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:45,129 INFO L241 Difference]: Finished difference. Result has 41 places, 20 transitions, 87 flow [2021-03-26 03:22:45,129 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=41, PETRI_DIFFERENCE_MINUEND_FLOW=85, PETRI_DIFFERENCE_MINUEND_PLACES=39, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=87, PETRI_PLACES=41, PETRI_TRANSITIONS=20} [2021-03-26 03:22:45,129 INFO L343 CegarLoopForPetriNet]: 40 programPoint places, 1 predicate places. [2021-03-26 03:22:45,129 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:45,130 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 41 places, 20 transitions, 87 flow [2021-03-26 03:22:45,130 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 41 places, 20 transitions, 87 flow [2021-03-26 03:22:45,130 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 20 transitions, 87 flow [2021-03-26 03:22:45,132 INFO L129 PetriNetUnfolder]: 0/20 cut-off events. [2021-03-26 03:22:45,132 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:45,132 INFO L84 FinitePrefix]: Finished finitePrefix Result has 59 conditions, 20 events. 0/20 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 15 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-26 03:22:45,132 INFO L142 LiptonReduction]: Number of co-enabled transitions 162 [2021-03-26 03:22:45,133 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:45,134 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:45,134 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-26 03:22:45,134 INFO L480 AbstractCegarLoop]: Abstraction has has 41 places, 20 transitions, 87 flow [2021-03-26 03:22:45,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,134 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:45,134 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:45,135 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-03-26 03:22:45,135 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:45,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:45,135 INFO L82 PathProgramCache]: Analyzing trace with hash -607272555, now seen corresponding path program 1 times [2021-03-26 03:22:45,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:45,135 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107298356] [2021-03-26 03:22:45,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:45,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:45,149 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:45,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:45,151 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:45,152 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:45,152 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:45,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-03-26 03:22:45,152 WARN L342 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:45,153 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2021-03-26 03:22:45,168 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:45,168 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:45,169 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:45,169 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:45,169 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:45,169 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:45,169 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:45,169 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:45,169 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:45,169 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:45,171 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 56 places, 35 transitions, 210 flow [2021-03-26 03:22:45,176 INFO L129 PetriNetUnfolder]: 0/65 cut-off events. [2021-03-26 03:22:45,176 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:45,176 INFO L84 FinitePrefix]: Finished finitePrefix Result has 151 conditions, 65 events. 0/65 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 234 event pairs, 0 based on Foata normal form. 0/54 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-26 03:22:45,176 INFO L82 GeneralOperation]: Start removeDead. Operand has 56 places, 35 transitions, 210 flow [2021-03-26 03:22:45,176 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 54 places, 33 transitions, 206 flow [2021-03-26 03:22:45,177 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:45,177 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-26 03:22:45,177 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-26 03:22:45,177 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 54 places, 33 transitions, 206 flow [2021-03-26 03:22:45,180 INFO L129 PetriNetUnfolder]: 0/43 cut-off events. [2021-03-26 03:22:45,180 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:45,180 INFO L84 FinitePrefix]: Finished finitePrefix Result has 129 conditions, 43 events. 0/43 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 110 event pairs, 0 based on Foata normal form. 0/43 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-26 03:22:45,181 INFO L142 LiptonReduction]: Number of co-enabled transitions 620 [2021-03-26 03:22:45,489 INFO L154 LiptonReduction]: Checked pairs total: 245 [2021-03-26 03:22:45,489 INFO L156 LiptonReduction]: Total number of compositions: 10 [2021-03-26 03:22:45,489 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 312 [2021-03-26 03:22:45,491 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:22:45,491 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:45,491 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:45,491 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:45,491 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:45,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:45,492 INFO L82 PathProgramCache]: Analyzing trace with hash 9379, now seen corresponding path program 1 times [2021-03-26 03:22:45,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:45,492 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31029394] [2021-03-26 03:22:45,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:45,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:45,500 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:45,500 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:45,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:45,503 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31029394] [2021-03-26 03:22:45,503 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:45,503 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:45,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922414162] [2021-03-26 03:22:45,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:45,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:45,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:45,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:45,507 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 45 [2021-03-26 03:22:45,507 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 23 transitions, 186 flow. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,507 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:45,507 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 45 [2021-03-26 03:22:45,507 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:45,892 INFO L129 PetriNetUnfolder]: 4097/5132 cut-off events. [2021-03-26 03:22:45,893 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:45,912 INFO L84 FinitePrefix]: Finished finitePrefix Result has 10340 conditions, 5132 events. 4097/5132 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 456. Compared 23250 event pairs, 4097 based on Foata normal form. 1034/5949 useless extension candidates. Maximal degree in co-relation 10240. Up to 5121 conditions per place. [2021-03-26 03:22:45,945 INFO L132 encePairwiseOnDemand]: 43/45 looper letters, 10 selfloop transitions, 1 changer transitions 0/22 dead transitions. [2021-03-26 03:22:45,946 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 22 transitions, 206 flow [2021-03-26 03:22:45,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:45,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:45,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 78 transitions. [2021-03-26 03:22:45,947 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5777777777777777 [2021-03-26 03:22:45,947 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 78 transitions. [2021-03-26 03:22:45,947 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 78 transitions. [2021-03-26 03:22:45,947 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:45,947 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 78 transitions. [2021-03-26 03:22:45,947 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,948 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 45.0) internal successors, (180), 4 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,949 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 45.0) internal successors, (180), 4 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,949 INFO L185 Difference]: Start difference. First operand has 44 places, 23 transitions, 186 flow. Second operand 3 states and 78 transitions. [2021-03-26 03:22:45,949 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 22 transitions, 206 flow [2021-03-26 03:22:45,950 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 22 transitions, 116 flow, removed 45 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:45,951 INFO L241 Difference]: Finished difference. Result has 45 places, 22 transitions, 96 flow [2021-03-26 03:22:45,952 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=45, PETRI_DIFFERENCE_MINUEND_FLOW=94, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=96, PETRI_PLACES=45, PETRI_TRANSITIONS=22} [2021-03-26 03:22:45,952 INFO L343 CegarLoopForPetriNet]: 44 programPoint places, 1 predicate places. [2021-03-26 03:22:45,952 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:45,952 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 45 places, 22 transitions, 96 flow [2021-03-26 03:22:45,952 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 45 places, 22 transitions, 96 flow [2021-03-26 03:22:45,953 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 45 places, 22 transitions, 96 flow [2021-03-26 03:22:45,955 INFO L129 PetriNetUnfolder]: 0/22 cut-off events. [2021-03-26 03:22:45,955 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:45,955 INFO L84 FinitePrefix]: Finished finitePrefix Result has 65 conditions, 22 events. 0/22 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 20 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-26 03:22:45,955 INFO L142 LiptonReduction]: Number of co-enabled transitions 200 [2021-03-26 03:22:45,957 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:45,957 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:45,957 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-26 03:22:45,959 INFO L480 AbstractCegarLoop]: Abstraction has has 45 places, 22 transitions, 96 flow [2021-03-26 03:22:45,959 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:45,959 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:45,959 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:45,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-03-26 03:22:45,959 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:45,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:45,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1208304905, now seen corresponding path program 1 times [2021-03-26 03:22:45,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:45,960 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657637847] [2021-03-26 03:22:45,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:45,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:45,965 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:45,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:45,968 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:45,971 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:45,971 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:45,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-03-26 03:22:45,971 WARN L342 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:45,971 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2021-03-26 03:22:45,992 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:45,993 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:45,994 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:45,994 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:45,994 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:45,994 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:45,994 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:45,994 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:45,994 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:45,994 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:45,997 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 38 transitions, 241 flow [2021-03-26 03:22:46,002 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-26 03:22:46,002 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:46,002 INFO L84 FinitePrefix]: Finished finitePrefix Result has 171 conditions, 71 events. 0/71 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 257 event pairs, 0 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-26 03:22:46,002 INFO L82 GeneralOperation]: Start removeDead. Operand has 61 places, 38 transitions, 241 flow [2021-03-26 03:22:46,002 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 36 transitions, 237 flow [2021-03-26 03:22:46,002 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:46,003 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-26 03:22:46,003 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-26 03:22:46,003 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 59 places, 36 transitions, 237 flow [2021-03-26 03:22:46,006 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-26 03:22:46,006 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:46,007 INFO L84 FinitePrefix]: Finished finitePrefix Result has 147 conditions, 47 events. 0/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 142 event pairs, 0 based on Foata normal form. 0/47 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-26 03:22:46,007 INFO L142 LiptonReduction]: Number of co-enabled transitions 748 [2021-03-26 03:22:46,318 INFO L154 LiptonReduction]: Checked pairs total: 297 [2021-03-26 03:22:46,319 INFO L156 LiptonReduction]: Total number of compositions: 11 [2021-03-26 03:22:46,319 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 317 [2021-03-26 03:22:46,320 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-26 03:22:46,320 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:46,320 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:46,320 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:46,320 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:46,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:46,321 INFO L82 PathProgramCache]: Analyzing trace with hash 10915, now seen corresponding path program 1 times [2021-03-26 03:22:46,321 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:46,321 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508500947] [2021-03-26 03:22:46,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:46,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:46,332 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:46,333 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:46,335 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:46,336 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508500947] [2021-03-26 03:22:46,336 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:46,336 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:46,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144757410] [2021-03-26 03:22:46,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:46,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:46,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:46,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:46,337 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 49 [2021-03-26 03:22:46,337 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 25 transitions, 215 flow. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:46,337 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:46,337 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 49 [2021-03-26 03:22:46,337 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:47,399 INFO L129 PetriNetUnfolder]: 9217/11277 cut-off events. [2021-03-26 03:22:47,399 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:47,448 INFO L84 FinitePrefix]: Finished finitePrefix Result has 22643 conditions, 11277 events. 9217/11277 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 891. Compared 52532 event pairs, 9217 based on Foata normal form. 2059/12977 useless extension candidates. Maximal degree in co-relation 22528. Up to 11265 conditions per place. [2021-03-26 03:22:47,543 INFO L132 encePairwiseOnDemand]: 47/49 looper letters, 11 selfloop transitions, 1 changer transitions 0/24 dead transitions. [2021-03-26 03:22:47,544 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 24 transitions, 237 flow [2021-03-26 03:22:47,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:47,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:47,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 85 transitions. [2021-03-26 03:22:47,545 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5782312925170068 [2021-03-26 03:22:47,545 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 85 transitions. [2021-03-26 03:22:47,545 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 85 transitions. [2021-03-26 03:22:47,545 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:47,546 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 85 transitions. [2021-03-26 03:22:47,546 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:47,547 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:47,547 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:47,547 INFO L185 Difference]: Start difference. First operand has 48 places, 25 transitions, 215 flow. Second operand 3 states and 85 transitions. [2021-03-26 03:22:47,547 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 24 transitions, 237 flow [2021-03-26 03:22:47,549 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 24 transitions, 127 flow, removed 55 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:47,549 INFO L241 Difference]: Finished difference. Result has 49 places, 24 transitions, 105 flow [2021-03-26 03:22:47,550 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=49, PETRI_DIFFERENCE_MINUEND_FLOW=103, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=105, PETRI_PLACES=49, PETRI_TRANSITIONS=24} [2021-03-26 03:22:47,550 INFO L343 CegarLoopForPetriNet]: 48 programPoint places, 1 predicate places. [2021-03-26 03:22:47,550 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:47,550 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 24 transitions, 105 flow [2021-03-26 03:22:47,550 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 24 transitions, 105 flow [2021-03-26 03:22:47,550 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 24 transitions, 105 flow [2021-03-26 03:22:47,553 INFO L129 PetriNetUnfolder]: 0/24 cut-off events. [2021-03-26 03:22:47,553 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:47,553 INFO L84 FinitePrefix]: Finished finitePrefix Result has 71 conditions, 24 events. 0/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 21 event pairs, 0 based on Foata normal form. 0/24 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-26 03:22:47,553 INFO L142 LiptonReduction]: Number of co-enabled transitions 242 [2021-03-26 03:22:47,554 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:47,554 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:47,554 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 4 [2021-03-26 03:22:47,555 INFO L480 AbstractCegarLoop]: Abstraction has has 49 places, 24 transitions, 105 flow [2021-03-26 03:22:47,555 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:47,555 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:47,555 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:47,555 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-03-26 03:22:47,555 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:47,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:47,556 INFO L82 PathProgramCache]: Analyzing trace with hash 941462544, now seen corresponding path program 1 times [2021-03-26 03:22:47,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:47,556 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805340444] [2021-03-26 03:22:47,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:47,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:47,563 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:47,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:47,576 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:47,580 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:47,580 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:47,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-03-26 03:22:47,581 WARN L342 ceAbstractionStarter]: 11 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:47,581 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 12 thread instances. [2021-03-26 03:22:47,597 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:47,597 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:47,598 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:47,598 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:47,598 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:47,598 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:47,598 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:47,598 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:47,598 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:47,598 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:47,599 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 66 places, 41 transitions, 274 flow [2021-03-26 03:22:47,605 INFO L129 PetriNetUnfolder]: 0/77 cut-off events. [2021-03-26 03:22:47,605 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:47,605 INFO L84 FinitePrefix]: Finished finitePrefix Result has 192 conditions, 77 events. 0/77 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 294 event pairs, 0 based on Foata normal form. 0/64 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-26 03:22:47,606 INFO L82 GeneralOperation]: Start removeDead. Operand has 66 places, 41 transitions, 274 flow [2021-03-26 03:22:47,606 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 39 transitions, 270 flow [2021-03-26 03:22:47,606 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:47,606 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-26 03:22:47,607 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-26 03:22:47,607 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 64 places, 39 transitions, 270 flow [2021-03-26 03:22:47,610 INFO L129 PetriNetUnfolder]: 0/51 cut-off events. [2021-03-26 03:22:47,610 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:47,610 INFO L84 FinitePrefix]: Finished finitePrefix Result has 166 conditions, 51 events. 0/51 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 153 event pairs, 0 based on Foata normal form. 0/51 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-26 03:22:47,611 INFO L142 LiptonReduction]: Number of co-enabled transitions 888 [2021-03-26 03:22:47,948 INFO L154 LiptonReduction]: Checked pairs total: 354 [2021-03-26 03:22:47,949 INFO L156 LiptonReduction]: Total number of compositions: 12 [2021-03-26 03:22:47,949 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 343 [2021-03-26 03:22:47,950 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-26 03:22:47,950 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:47,950 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:47,950 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:47,950 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:47,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:47,951 INFO L82 PathProgramCache]: Analyzing trace with hash 12579, now seen corresponding path program 1 times [2021-03-26 03:22:47,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:47,951 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143850310] [2021-03-26 03:22:47,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:47,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:47,958 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:47,959 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:47,961 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:47,962 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143850310] [2021-03-26 03:22:47,962 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:47,962 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:47,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199429789] [2021-03-26 03:22:47,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:47,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:47,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:47,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:47,963 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 53 [2021-03-26 03:22:47,963 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 27 transitions, 246 flow. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:47,963 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:47,963 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 53 [2021-03-26 03:22:47,964 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:50,190 INFO L129 PetriNetUnfolder]: 20481/24590 cut-off events. [2021-03-26 03:22:50,190 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:50,271 INFO L84 FinitePrefix]: Finished finitePrefix Result has 49283 conditions, 24590 events. 20481/24590 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1750. Compared 115355 event pairs, 20481 based on Foata normal form. 4108/28107 useless extension candidates. Maximal degree in co-relation 49152. Up to 24577 conditions per place. [2021-03-26 03:22:50,367 INFO L132 encePairwiseOnDemand]: 51/53 looper letters, 12 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2021-03-26 03:22:50,367 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 26 transitions, 270 flow [2021-03-26 03:22:50,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:50,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:50,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 92 transitions. [2021-03-26 03:22:50,368 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5786163522012578 [2021-03-26 03:22:50,368 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 92 transitions. [2021-03-26 03:22:50,368 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 92 transitions. [2021-03-26 03:22:50,368 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:50,368 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 92 transitions. [2021-03-26 03:22:50,369 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:50,369 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 53.0) internal successors, (212), 4 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:50,369 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 53.0) internal successors, (212), 4 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:50,369 INFO L185 Difference]: Start difference. First operand has 52 places, 27 transitions, 246 flow. Second operand 3 states and 92 transitions. [2021-03-26 03:22:50,369 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 26 transitions, 270 flow [2021-03-26 03:22:50,370 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 53 places, 26 transitions, 138 flow, removed 66 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:50,371 INFO L241 Difference]: Finished difference. Result has 53 places, 26 transitions, 114 flow [2021-03-26 03:22:50,371 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=53, PETRI_DIFFERENCE_MINUEND_FLOW=112, PETRI_DIFFERENCE_MINUEND_PLACES=51, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=114, PETRI_PLACES=53, PETRI_TRANSITIONS=26} [2021-03-26 03:22:50,371 INFO L343 CegarLoopForPetriNet]: 52 programPoint places, 1 predicate places. [2021-03-26 03:22:50,371 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:50,372 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 53 places, 26 transitions, 114 flow [2021-03-26 03:22:50,372 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 53 places, 26 transitions, 114 flow [2021-03-26 03:22:50,372 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 53 places, 26 transitions, 114 flow [2021-03-26 03:22:50,374 INFO L129 PetriNetUnfolder]: 0/26 cut-off events. [2021-03-26 03:22:50,374 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:50,374 INFO L84 FinitePrefix]: Finished finitePrefix Result has 77 conditions, 26 events. 0/26 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 24 event pairs, 0 based on Foata normal form. 0/26 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-26 03:22:50,374 INFO L142 LiptonReduction]: Number of co-enabled transitions 288 [2021-03-26 03:22:50,376 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:50,376 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:50,376 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-26 03:22:50,376 INFO L480 AbstractCegarLoop]: Abstraction has has 53 places, 26 transitions, 114 flow [2021-03-26 03:22:50,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:50,376 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:50,376 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:50,377 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-03-26 03:22:50,377 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:50,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:50,377 INFO L82 PathProgramCache]: Analyzing trace with hash 1127292090, now seen corresponding path program 1 times [2021-03-26 03:22:50,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:50,377 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1813269249] [2021-03-26 03:22:50,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:50,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:50,388 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:50,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:50,393 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:50,399 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:50,399 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:50,399 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-03-26 03:22:50,400 WARN L342 ceAbstractionStarter]: 12 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:50,400 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 13 thread instances. [2021-03-26 03:22:50,421 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:50,421 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:50,422 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:50,422 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:50,422 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:50,422 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:50,422 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:50,422 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:50,422 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:50,422 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:50,423 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 71 places, 44 transitions, 309 flow [2021-03-26 03:22:50,427 INFO L129 PetriNetUnfolder]: 0/83 cut-off events. [2021-03-26 03:22:50,427 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:50,427 INFO L84 FinitePrefix]: Finished finitePrefix Result has 214 conditions, 83 events. 0/83 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 304 event pairs, 0 based on Foata normal form. 0/69 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-26 03:22:50,427 INFO L82 GeneralOperation]: Start removeDead. Operand has 71 places, 44 transitions, 309 flow [2021-03-26 03:22:50,428 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 69 places, 42 transitions, 305 flow [2021-03-26 03:22:50,428 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:50,428 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-26 03:22:50,428 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-26 03:22:50,428 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 69 places, 42 transitions, 305 flow [2021-03-26 03:22:50,431 INFO L129 PetriNetUnfolder]: 0/55 cut-off events. [2021-03-26 03:22:50,431 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:50,431 INFO L84 FinitePrefix]: Finished finitePrefix Result has 186 conditions, 55 events. 0/55 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 126 event pairs, 0 based on Foata normal form. 0/55 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-26 03:22:50,432 INFO L142 LiptonReduction]: Number of co-enabled transitions 1040 [2021-03-26 03:22:50,842 INFO L154 LiptonReduction]: Checked pairs total: 416 [2021-03-26 03:22:50,842 INFO L156 LiptonReduction]: Total number of compositions: 13 [2021-03-26 03:22:50,842 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 414 [2021-03-26 03:22:50,844 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:22:50,844 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:50,844 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:50,844 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:50,844 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:50,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:50,844 INFO L82 PathProgramCache]: Analyzing trace with hash 14371, now seen corresponding path program 1 times [2021-03-26 03:22:50,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:50,844 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631114653] [2021-03-26 03:22:50,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:50,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:50,852 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:50,853 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:50,855 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:50,855 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631114653] [2021-03-26 03:22:50,855 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:50,855 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:50,856 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737423653] [2021-03-26 03:22:50,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:50,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:50,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:50,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:50,857 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 57 [2021-03-26 03:22:50,857 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 29 transitions, 279 flow. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:50,857 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:50,857 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 57 [2021-03-26 03:22:50,857 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:22:54,761 INFO L129 PetriNetUnfolder]: 45057/53263 cut-off events. [2021-03-26 03:22:54,771 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:55,259 INFO L84 FinitePrefix]: Finished finitePrefix Result has 106644 conditions, 53263 events. 45057/53263 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3418. Compared 250977 event pairs, 45057 based on Foata normal form. 8205/60501 useless extension candidates. Maximal degree in co-relation 106496. Up to 53249 conditions per place. [2021-03-26 03:22:55,515 INFO L132 encePairwiseOnDemand]: 55/57 looper letters, 13 selfloop transitions, 1 changer transitions 0/28 dead transitions. [2021-03-26 03:22:55,515 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 28 transitions, 305 flow [2021-03-26 03:22:55,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:22:55,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:22:55,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2021-03-26 03:22:55,517 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5789473684210527 [2021-03-26 03:22:55,517 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 99 transitions. [2021-03-26 03:22:55,517 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 99 transitions. [2021-03-26 03:22:55,517 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:22:55,517 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 99 transitions. [2021-03-26 03:22:55,518 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:55,518 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:55,518 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:55,518 INFO L185 Difference]: Start difference. First operand has 56 places, 29 transitions, 279 flow. Second operand 3 states and 99 transitions. [2021-03-26 03:22:55,518 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 28 transitions, 305 flow [2021-03-26 03:22:55,521 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 28 transitions, 149 flow, removed 78 selfloop flow, removed 0 redundant places. [2021-03-26 03:22:55,522 INFO L241 Difference]: Finished difference. Result has 57 places, 28 transitions, 123 flow [2021-03-26 03:22:55,522 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=57, PETRI_DIFFERENCE_MINUEND_FLOW=121, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=123, PETRI_PLACES=57, PETRI_TRANSITIONS=28} [2021-03-26 03:22:55,522 INFO L343 CegarLoopForPetriNet]: 56 programPoint places, 1 predicate places. [2021-03-26 03:22:55,522 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:55,523 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 57 places, 28 transitions, 123 flow [2021-03-26 03:22:55,523 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 57 places, 28 transitions, 123 flow [2021-03-26 03:22:55,524 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 57 places, 28 transitions, 123 flow [2021-03-26 03:22:55,526 INFO L129 PetriNetUnfolder]: 0/28 cut-off events. [2021-03-26 03:22:55,526 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:55,526 INFO L84 FinitePrefix]: Finished finitePrefix Result has 83 conditions, 28 events. 0/28 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 23 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-26 03:22:55,527 INFO L142 LiptonReduction]: Number of co-enabled transitions 338 [2021-03-26 03:22:55,528 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:22:55,528 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:22:55,528 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-03-26 03:22:55,529 INFO L480 AbstractCegarLoop]: Abstraction has has 57 places, 28 transitions, 123 flow [2021-03-26 03:22:55,529 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:55,529 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:55,530 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:22:55,530 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-03-26 03:22:55,530 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:55,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:55,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1451810459, now seen corresponding path program 1 times [2021-03-26 03:22:55,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:55,530 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700330342] [2021-03-26 03:22:55,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:55,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:55,546 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:55,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:22:55,549 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:22:55,551 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:22:55,551 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:22:55,551 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-03-26 03:22:55,551 WARN L342 ceAbstractionStarter]: 13 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:22:55,551 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 14 thread instances. [2021-03-26 03:22:55,577 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:22:55,578 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:22:55,578 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:22:55,578 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:22:55,578 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:22:55,579 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:22:55,579 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:22:55,579 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:22:55,579 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:22:55,579 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:22:55,580 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 76 places, 47 transitions, 346 flow [2021-03-26 03:22:55,584 INFO L129 PetriNetUnfolder]: 0/89 cut-off events. [2021-03-26 03:22:55,584 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:55,585 INFO L84 FinitePrefix]: Finished finitePrefix Result has 237 conditions, 89 events. 0/89 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 346 event pairs, 0 based on Foata normal form. 0/74 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-26 03:22:55,585 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 47 transitions, 346 flow [2021-03-26 03:22:55,585 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 74 places, 45 transitions, 342 flow [2021-03-26 03:22:55,585 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:22:55,586 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-26 03:22:55,586 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-26 03:22:55,586 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 74 places, 45 transitions, 342 flow [2021-03-26 03:22:55,590 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-26 03:22:55,590 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:55,590 INFO L84 FinitePrefix]: Finished finitePrefix Result has 207 conditions, 59 events. 0/59 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 167 event pairs, 0 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-26 03:22:55,591 INFO L142 LiptonReduction]: Number of co-enabled transitions 1204 [2021-03-26 03:22:56,025 INFO L154 LiptonReduction]: Checked pairs total: 483 [2021-03-26 03:22:56,025 INFO L156 LiptonReduction]: Total number of compositions: 14 [2021-03-26 03:22:56,025 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 440 [2021-03-26 03:22:56,027 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-26 03:22:56,027 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:22:56,027 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:22:56,027 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:22:56,027 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:22:56,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:22:56,028 INFO L82 PathProgramCache]: Analyzing trace with hash 16291, now seen corresponding path program 1 times [2021-03-26 03:22:56,028 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:22:56,028 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090603835] [2021-03-26 03:22:56,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:22:56,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:22:56,034 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:22:56,034 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:22:56,036 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:22:56,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090603835] [2021-03-26 03:22:56,037 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:22:56,037 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:22:56,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464004199] [2021-03-26 03:22:56,037 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:22:56,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:22:56,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:22:56,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:22:56,038 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 61 [2021-03-26 03:22:56,038 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 31 transitions, 314 flow. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:22:56,038 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:22:56,039 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 61 [2021-03-26 03:22:56,039 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:23:06,089 INFO L129 PetriNetUnfolder]: 98305/114704 cut-off events. [2021-03-26 03:23:06,089 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:07,285 INFO L84 FinitePrefix]: Finished finitePrefix Result has 229542 conditions, 114704 events. 98305/114704 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6734. Compared 544782 event pairs, 98305 based on Foata normal form. 16398/129530 useless extension candidates. Maximal degree in co-relation 229376. Up to 114689 conditions per place. [2021-03-26 03:23:07,657 INFO L132 encePairwiseOnDemand]: 59/61 looper letters, 14 selfloop transitions, 1 changer transitions 0/30 dead transitions. [2021-03-26 03:23:07,658 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 30 transitions, 342 flow [2021-03-26 03:23:07,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:23:07,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:23:07,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 106 transitions. [2021-03-26 03:23:07,659 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5792349726775956 [2021-03-26 03:23:07,659 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 106 transitions. [2021-03-26 03:23:07,659 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 106 transitions. [2021-03-26 03:23:07,659 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:23:07,659 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 106 transitions. [2021-03-26 03:23:07,660 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:07,660 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 61.0) internal successors, (244), 4 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:07,660 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 61.0) internal successors, (244), 4 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:07,660 INFO L185 Difference]: Start difference. First operand has 60 places, 31 transitions, 314 flow. Second operand 3 states and 106 transitions. [2021-03-26 03:23:07,660 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 30 transitions, 342 flow [2021-03-26 03:23:07,662 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 30 transitions, 160 flow, removed 91 selfloop flow, removed 0 redundant places. [2021-03-26 03:23:07,663 INFO L241 Difference]: Finished difference. Result has 61 places, 30 transitions, 132 flow [2021-03-26 03:23:07,663 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=61, PETRI_DIFFERENCE_MINUEND_FLOW=130, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=132, PETRI_PLACES=61, PETRI_TRANSITIONS=30} [2021-03-26 03:23:07,663 INFO L343 CegarLoopForPetriNet]: 60 programPoint places, 1 predicate places. [2021-03-26 03:23:07,663 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:23:07,663 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 61 places, 30 transitions, 132 flow [2021-03-26 03:23:07,663 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 61 places, 30 transitions, 132 flow [2021-03-26 03:23:07,663 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 30 transitions, 132 flow [2021-03-26 03:23:07,665 INFO L129 PetriNetUnfolder]: 0/30 cut-off events. [2021-03-26 03:23:07,666 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:07,666 INFO L84 FinitePrefix]: Finished finitePrefix Result has 89 conditions, 30 events. 0/30 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 32 event pairs, 0 based on Foata normal form. 0/30 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-26 03:23:07,666 INFO L142 LiptonReduction]: Number of co-enabled transitions 392 [2021-03-26 03:23:07,668 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:23:07,668 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:23:07,668 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-26 03:23:07,668 INFO L480 AbstractCegarLoop]: Abstraction has has 61 places, 30 transitions, 132 flow [2021-03-26 03:23:07,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:07,669 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:23:07,669 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:23:07,669 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-03-26 03:23:07,669 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:23:07,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:23:07,669 INFO L82 PathProgramCache]: Analyzing trace with hash -138593667, now seen corresponding path program 1 times [2021-03-26 03:23:07,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:23:07,669 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253581993] [2021-03-26 03:23:07,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:23:07,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:23:07,673 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:23:07,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:23:07,674 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:23:07,676 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:23:07,676 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:23:07,676 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-03-26 03:23:07,676 WARN L342 ceAbstractionStarter]: 14 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:23:07,677 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 15 thread instances. [2021-03-26 03:23:07,693 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:23:07,693 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:23:07,693 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:23:07,693 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:23:07,693 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:23:07,694 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:23:07,694 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:23:07,694 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:23:07,694 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:23:07,694 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:23:07,694 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 81 places, 50 transitions, 385 flow [2021-03-26 03:23:07,699 INFO L129 PetriNetUnfolder]: 0/95 cut-off events. [2021-03-26 03:23:07,699 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:07,699 INFO L84 FinitePrefix]: Finished finitePrefix Result has 261 conditions, 95 events. 0/95 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 296 event pairs, 0 based on Foata normal form. 0/79 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-26 03:23:07,699 INFO L82 GeneralOperation]: Start removeDead. Operand has 81 places, 50 transitions, 385 flow [2021-03-26 03:23:07,700 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 79 places, 48 transitions, 381 flow [2021-03-26 03:23:07,700 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:23:07,700 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-26 03:23:07,700 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-26 03:23:07,701 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 79 places, 48 transitions, 381 flow [2021-03-26 03:23:07,704 INFO L129 PetriNetUnfolder]: 0/63 cut-off events. [2021-03-26 03:23:07,704 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:07,704 INFO L84 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 63 events. 0/63 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 179 event pairs, 0 based on Foata normal form. 0/63 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-26 03:23:07,705 INFO L142 LiptonReduction]: Number of co-enabled transitions 1380 [2021-03-26 03:23:07,974 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2021-03-26 03:23:08,436 INFO L154 LiptonReduction]: Checked pairs total: 555 [2021-03-26 03:23:08,437 INFO L156 LiptonReduction]: Total number of compositions: 15 [2021-03-26 03:23:08,437 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 737 [2021-03-26 03:23:08,438 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-26 03:23:08,438 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:08,438 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:23:08,438 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:23:08,438 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:23:08,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:23:08,439 INFO L82 PathProgramCache]: Analyzing trace with hash 18339, now seen corresponding path program 1 times [2021-03-26 03:23:08,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:23:08,439 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782620670] [2021-03-26 03:23:08,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:23:08,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:23:08,446 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:23:08,447 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:23:08,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:23:08,449 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782620670] [2021-03-26 03:23:08,449 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:23:08,449 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:23:08,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026414812] [2021-03-26 03:23:08,450 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:23:08,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:23:08,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:23:08,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:23:08,451 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 65 [2021-03-26 03:23:08,451 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 33 transitions, 351 flow. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:08,451 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:23:08,451 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 65 [2021-03-26 03:23:08,451 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:23:41,168 INFO L129 PetriNetUnfolder]: 212993/245777 cut-off events. [2021-03-26 03:23:41,169 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:44,363 INFO L84 FinitePrefix]: Finished finitePrefix Result has 491705 conditions, 245777 events. 212993/245777 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 13156. Compared 1164137 event pairs, 212993 based on Foata normal form. 32783/275999 useless extension candidates. Maximal degree in co-relation 491520. Up to 245761 conditions per place. [2021-03-26 03:23:45,254 INFO L132 encePairwiseOnDemand]: 63/65 looper letters, 15 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2021-03-26 03:23:45,255 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 32 transitions, 381 flow [2021-03-26 03:23:45,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:23:45,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:23:45,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 113 transitions. [2021-03-26 03:23:45,255 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5794871794871795 [2021-03-26 03:23:45,256 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 113 transitions. [2021-03-26 03:23:45,256 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 113 transitions. [2021-03-26 03:23:45,256 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:23:45,256 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 113 transitions. [2021-03-26 03:23:45,256 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:45,257 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 65.0) internal successors, (260), 4 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:45,257 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 65.0) internal successors, (260), 4 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:45,257 INFO L185 Difference]: Start difference. First operand has 64 places, 33 transitions, 351 flow. Second operand 3 states and 113 transitions. [2021-03-26 03:23:45,257 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 32 transitions, 381 flow [2021-03-26 03:23:45,259 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 32 transitions, 171 flow, removed 105 selfloop flow, removed 0 redundant places. [2021-03-26 03:23:45,260 INFO L241 Difference]: Finished difference. Result has 65 places, 32 transitions, 141 flow [2021-03-26 03:23:45,260 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=65, PETRI_DIFFERENCE_MINUEND_FLOW=139, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=141, PETRI_PLACES=65, PETRI_TRANSITIONS=32} [2021-03-26 03:23:45,260 INFO L343 CegarLoopForPetriNet]: 64 programPoint places, 1 predicate places. [2021-03-26 03:23:45,260 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:23:45,260 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 65 places, 32 transitions, 141 flow [2021-03-26 03:23:45,261 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 65 places, 32 transitions, 141 flow [2021-03-26 03:23:45,261 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 65 places, 32 transitions, 141 flow [2021-03-26 03:23:45,263 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-26 03:23:45,263 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:45,263 INFO L84 FinitePrefix]: Finished finitePrefix Result has 95 conditions, 32 events. 0/32 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 29 event pairs, 0 based on Foata normal form. 0/32 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-26 03:23:45,263 INFO L142 LiptonReduction]: Number of co-enabled transitions 450 [2021-03-26 03:23:45,265 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:23:45,265 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:23:45,266 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 6 [2021-03-26 03:23:45,266 INFO L480 AbstractCegarLoop]: Abstraction has has 65 places, 32 transitions, 141 flow [2021-03-26 03:23:45,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:45,266 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:23:45,267 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:23:45,267 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-03-26 03:23:45,267 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:23:45,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:23:45,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1465640138, now seen corresponding path program 1 times [2021-03-26 03:23:45,267 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:23:45,267 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [176744503] [2021-03-26 03:23:45,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:23:45,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:23:45,271 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:23:45,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:23:45,272 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:23:45,274 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:23:45,274 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:23:45,275 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-03-26 03:23:45,275 WARN L342 ceAbstractionStarter]: 15 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:23:45,275 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 16 thread instances. [2021-03-26 03:23:45,291 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:23:45,291 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:23:45,292 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:23:45,292 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:23:45,292 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:23:45,292 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:23:45,292 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:23:45,292 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:23:45,292 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:23:45,292 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:23:45,293 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 86 places, 53 transitions, 426 flow [2021-03-26 03:23:45,298 INFO L129 PetriNetUnfolder]: 0/101 cut-off events. [2021-03-26 03:23:45,298 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:45,298 INFO L84 FinitePrefix]: Finished finitePrefix Result has 286 conditions, 101 events. 0/101 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 329 event pairs, 0 based on Foata normal form. 0/84 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-26 03:23:45,298 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 53 transitions, 426 flow [2021-03-26 03:23:45,299 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 84 places, 51 transitions, 422 flow [2021-03-26 03:23:45,299 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:23:45,299 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-26 03:23:45,299 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-26 03:23:45,300 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 84 places, 51 transitions, 422 flow [2021-03-26 03:23:45,304 INFO L129 PetriNetUnfolder]: 0/67 cut-off events. [2021-03-26 03:23:45,304 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:45,304 INFO L84 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 67 events. 0/67 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 175 event pairs, 0 based on Foata normal form. 0/67 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-26 03:23:45,305 INFO L142 LiptonReduction]: Number of co-enabled transitions 1568 [2021-03-26 03:23:45,789 INFO L154 LiptonReduction]: Checked pairs total: 632 [2021-03-26 03:23:45,790 INFO L156 LiptonReduction]: Total number of compositions: 16 [2021-03-26 03:23:45,790 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 491 [2021-03-26 03:23:45,791 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-26 03:23:45,791 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:23:45,791 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:23:45,791 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:23:45,791 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:23:45,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:23:45,792 INFO L82 PathProgramCache]: Analyzing trace with hash 20515, now seen corresponding path program 1 times [2021-03-26 03:23:45,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:23:45,792 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778173516] [2021-03-26 03:23:45,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:23:45,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:23:45,798 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:23:45,799 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:23:45,801 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:23:45,801 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778173516] [2021-03-26 03:23:45,801 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:23:45,801 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:23:45,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114637777] [2021-03-26 03:23:45,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:23:45,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:23:45,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:23:45,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:23:45,802 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 34 out of 69 [2021-03-26 03:23:45,802 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 68 places, 35 transitions, 390 flow. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:23:45,802 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:23:45,802 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 34 of 69 [2021-03-26 03:23:45,802 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-26 03:25:21,507 INFO L129 PetriNetUnfolder]: 458753/524306 cut-off events. [2021-03-26 03:25:21,507 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:25:28,925 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1048781 conditions, 524306 events. 458753/524306 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 25986. Compared 2516437 event pairs, 458753 based on Foata normal form. 65552/585703 useless extension candidates. Maximal degree in co-relation 1048576. Up to 524289 conditions per place. [2021-03-26 03:25:30,779 INFO L132 encePairwiseOnDemand]: 67/69 looper letters, 16 selfloop transitions, 1 changer transitions 0/34 dead transitions. [2021-03-26 03:25:30,779 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 34 transitions, 422 flow [2021-03-26 03:25:30,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-26 03:25:30,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-26 03:25:30,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 120 transitions. [2021-03-26 03:25:30,780 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5797101449275363 [2021-03-26 03:25:30,780 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 120 transitions. [2021-03-26 03:25:30,780 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 120 transitions. [2021-03-26 03:25:30,780 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-26 03:25:30,780 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 120 transitions. [2021-03-26 03:25:30,781 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:25:30,781 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 69.0) internal successors, (276), 4 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:25:30,782 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 69.0) internal successors, (276), 4 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:25:30,782 INFO L185 Difference]: Start difference. First operand has 68 places, 35 transitions, 390 flow. Second operand 3 states and 120 transitions. [2021-03-26 03:25:30,782 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 34 transitions, 422 flow [2021-03-26 03:25:30,784 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 34 transitions, 182 flow, removed 120 selfloop flow, removed 0 redundant places. [2021-03-26 03:25:30,784 INFO L241 Difference]: Finished difference. Result has 69 places, 34 transitions, 150 flow [2021-03-26 03:25:30,785 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=69, PETRI_DIFFERENCE_MINUEND_FLOW=148, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=34, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=33, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=150, PETRI_PLACES=69, PETRI_TRANSITIONS=34} [2021-03-26 03:25:30,785 INFO L343 CegarLoopForPetriNet]: 68 programPoint places, 1 predicate places. [2021-03-26 03:25:30,785 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:25:30,785 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 69 places, 34 transitions, 150 flow [2021-03-26 03:25:30,785 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 69 places, 34 transitions, 150 flow [2021-03-26 03:25:30,785 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 69 places, 34 transitions, 150 flow [2021-03-26 03:25:30,787 INFO L129 PetriNetUnfolder]: 0/34 cut-off events. [2021-03-26 03:25:30,788 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:25:30,788 INFO L84 FinitePrefix]: Finished finitePrefix Result has 101 conditions, 34 events. 0/34 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 34 event pairs, 0 based on Foata normal form. 0/34 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-26 03:25:30,788 INFO L142 LiptonReduction]: Number of co-enabled transitions 512 [2021-03-26 03:25:30,790 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-26 03:25:30,790 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-26 03:25:30,790 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 5 [2021-03-26 03:25:30,791 INFO L480 AbstractCegarLoop]: Abstraction has has 69 places, 34 transitions, 150 flow [2021-03-26 03:25:30,791 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:25:30,791 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:25:30,791 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-26 03:25:30,791 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-03-26 03:25:30,791 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:25:30,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:25:30,792 INFO L82 PathProgramCache]: Analyzing trace with hash 1833507392, now seen corresponding path program 1 times [2021-03-26 03:25:30,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:25:30,792 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637678294] [2021-03-26 03:25:30,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:25:30,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:25:30,795 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:25:30,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-26 03:25:30,797 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-26 03:25:30,799 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-26 03:25:30,799 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-26 03:25:30,799 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-03-26 03:25:30,799 WARN L342 ceAbstractionStarter]: 16 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-26 03:25:30,799 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 17 thread instances. [2021-03-26 03:25:30,818 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-26 03:25:30,818 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-26 03:25:30,819 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-26 03:25:30,819 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-26 03:25:30,819 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-26 03:25:30,819 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-26 03:25:30,819 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-26 03:25:30,819 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-26 03:25:30,819 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-26 03:25:30,819 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-26 03:25:30,820 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 91 places, 56 transitions, 469 flow [2021-03-26 03:25:30,826 INFO L129 PetriNetUnfolder]: 0/107 cut-off events. [2021-03-26 03:25:30,826 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:25:30,826 INFO L84 FinitePrefix]: Finished finitePrefix Result has 312 conditions, 107 events. 0/107 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 345 event pairs, 0 based on Foata normal form. 0/89 useless extension candidates. Maximal degree in co-relation 0. Up to 18 conditions per place. [2021-03-26 03:25:30,826 INFO L82 GeneralOperation]: Start removeDead. Operand has 91 places, 56 transitions, 469 flow [2021-03-26 03:25:30,826 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 89 places, 54 transitions, 465 flow [2021-03-26 03:25:30,826 INFO L170 etLargeBlockEncoding]: Petri net LBE is using conditional semantic-based independence relation. [2021-03-26 03:25:30,827 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-26 03:25:30,827 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-26 03:25:30,827 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 89 places, 54 transitions, 465 flow [2021-03-26 03:25:30,831 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-26 03:25:30,831 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:25:30,832 INFO L84 FinitePrefix]: Finished finitePrefix Result has 276 conditions, 71 events. 0/71 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 185 event pairs, 0 based on Foata normal form. 0/71 useless extension candidates. Maximal degree in co-relation 0. Up to 18 conditions per place. [2021-03-26 03:25:30,833 INFO L142 LiptonReduction]: Number of co-enabled transitions 1768 [2021-03-26 03:25:31,399 INFO L154 LiptonReduction]: Checked pairs total: 714 [2021-03-26 03:25:31,400 INFO L156 LiptonReduction]: Total number of compositions: 17 [2021-03-26 03:25:31,400 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 574 [2021-03-26 03:25:31,401 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-26 03:25:31,401 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-26 03:25:31,401 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-26 03:25:31,401 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-26 03:25:31,401 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-26 03:25:31,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-26 03:25:31,402 INFO L82 PathProgramCache]: Analyzing trace with hash 22819, now seen corresponding path program 1 times [2021-03-26 03:25:31,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-26 03:25:31,402 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995482864] [2021-03-26 03:25:31,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-26 03:25:31,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-26 03:25:31,406 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-26 03:25:31,407 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-26 03:25:31,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-26 03:25:31,409 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995482864] [2021-03-26 03:25:31,409 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-26 03:25:31,409 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-26 03:25:31,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717772086] [2021-03-26 03:25:31,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-26 03:25:31,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-26 03:25:31,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-26 03:25:31,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-26 03:25:31,410 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 73 [2021-03-26 03:25:31,411 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 37 transitions, 431 flow. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-26 03:25:31,411 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-26 03:25:31,411 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 73 [2021-03-26 03:25:31,411 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand