/usr/bin/java -Xmx8000000000 -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-NoLbe-OGIterative-Hitting.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-2cf4d3f9dd5fed411db405f577e28237a543b59a-2cf4d3f [2021-08-13 12:44:52,039 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-13 12:44:52,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-13 12:44:52,081 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-08-13 12:44:52,155 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-NoLbe-OGIterative-Hitting.epf [2021-08-13 12:44:52,184 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-13 12:44:52,184 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-13 12:44:52,186 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-13 12:44:52,187 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-13 12:44:52,187 INFO L138 SettingsManager]: * Use SBE=true [2021-08-13 12:44:52,187 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-13 12:44:52,187 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-13 12:44:52,187 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-13 12:44:52,187 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-13 12:44:52,187 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-13 12:44:52,188 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-13 12:44:52,188 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-13 12:44:52,188 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-13 12:44:52,188 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-13 12:44:52,188 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-13 12:44:52,188 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-13 12:44:52,189 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-13 12:44:52,189 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-13 12:44:52,189 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-13 12:44:52,189 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-08-13 12:44:52,189 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-13 12:44:52,189 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-13 12:44:52,189 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-13 12:44:52,189 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * Compute cosets for OwickiGries annotation iteratively=true [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * Use hitting sets in computation of OwickiGries annotation=true [2021-08-13 12:44:52,190 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-08-13 12:44:52,450 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-13 12:44:52,474 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-13 12:44:52,476 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-13 12:44:52,477 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-08-13 12:44:52,478 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-08-13 12:44:52,479 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl [2021-08-13 12:44:52,479 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl' [2021-08-13 12:44:52,492 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-13 12:44:52,493 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-08-13 12:44:52,494 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-13 12:44:52,494 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-13 12:44:52,494 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-13 12:44:52,502 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 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,508 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 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,514 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-13 12:44:52,515 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-13 12:44:52,515 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-13 12:44:52,515 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-13 12:44:52,520 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,521 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,521 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,524 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,525 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,526 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (1/1) ... [2021-08-13 12:44:52,526 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-13 12:44:52,528 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-13 12:44:52,528 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-13 12:44:52,529 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-13 12:44:52,530 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (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 [2021-08-13 12:44:52,587 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-08-13 12:44:52,587 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-13 12:44:52,587 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-13 12:44:52,587 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-08-13 12:44:52,587 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-08-13 12:44:52,587 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-08-13 12:44:52,588 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-08-13 12:44:52,664 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-13 12:44:52,665 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-08-13 12:44:52,665 INFO L202 PluginConnector]: Adding new model fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.08 12:44:52 BoogieIcfgContainer [2021-08-13 12:44:52,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-13 12:44:52,667 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-13 12:44:52,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-13 12:44:52,669 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-13 12:44:52,669 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 12:44:52" (1/2) ... [2021-08-13 12:44:52,670 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38e3beb7 and model type fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.08 12:44:52, skipping insertion in model container [2021-08-13 12:44:52,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.08 12:44:52" (2/2) ... [2021-08-13 12:44:52,671 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_inc.bpl [2021-08-13 12:44:52,675 INFO L206 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-13 12:44:52,675 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-13 12:44:52,675 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-08-13 12:44:52,697 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:52,718 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:52,732 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:52,733 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:52,733 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:52,733 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:52,733 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:52,733 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:52,733 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:52,733 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:52,739 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 8 transitions, 21 flow [2021-08-13 12:44:52,749 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-08-13 12:44:52,750 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:52,751 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. [2021-08-13 12:44:52,751 INFO L82 GeneralOperation]: Start removeDead. Operand has 11 places, 8 transitions, 21 flow [2021-08-13 12:44:52,753 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 9 places, 6 transitions, 17 flow [2021-08-13 12:44:52,755 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:44:52,755 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:52,755 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:52,756 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:52,756 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:52,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:52,759 INFO L82 PathProgramCache]: Analyzing trace with hash 1315, now seen corresponding path program 1 times [2021-08-13 12:44:52,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:52,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368848380] [2021-08-13 12:44:52,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:52,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:52,832 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:52,833 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:52,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:52,841 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:52,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368848380] [2021-08-13 12:44:52,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368848380] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:52,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:52,842 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:52,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261039984] [2021-08-13 12:44:52,848 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:52,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:52,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:52,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:52,858 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 8 [2021-08-13 12:44:52,860 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 9 places, 6 transitions, 17 flow. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:52,860 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:52,860 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 8 [2021-08-13 12:44:52,861 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:52,869 INFO L129 PetriNetUnfolder]: 0/5 cut-off events. [2021-08-13 12:44:52,879 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:52,879 INFO L84 FinitePrefix]: Finished finitePrefix Result has 13 conditions, 5 events. 0/5 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. 3/8 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-08-13 12:44:52,880 INFO L132 encePairwiseOnDemand]: 6/8 looper letters, 1 selfloop transitions, 1 changer transitions 0/5 dead transitions. [2021-08-13 12:44:52,880 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 10 places, 5 transitions, 19 flow [2021-08-13 12:44:52,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:52,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:52,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 15 transitions. [2021-08-13 12:44:52,887 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.625 [2021-08-13 12:44:52,888 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 15 transitions. [2021-08-13 12:44:52,888 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 15 transitions. [2021-08-13 12:44:52,888 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:52,890 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 15 transitions. [2021-08-13 12:44:52,891 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) [2021-08-13 12:44:52,893 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 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) [2021-08-13 12:44:52,893 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 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) [2021-08-13 12:44:52,894 INFO L348 CegarLoopForPetriNet]: 9 programPoint places, 1 predicate places. [2021-08-13 12:44:52,894 INFO L482 AbstractCegarLoop]: Abstraction has has 10 places, 5 transitions, 19 flow [2021-08-13 12:44:52,894 INFO L483 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) [2021-08-13 12:44:52,894 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:52,894 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-08-13 12:44:52,894 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-13 12:44:52,894 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:52,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:52,895 INFO L82 PathProgramCache]: Analyzing trace with hash 41033, now seen corresponding path program 1 times [2021-08-13 12:44:52,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:52,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773353964] [2021-08-13 12:44:52,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:52,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:52,898 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:52,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:52,900 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:52,908 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:52,908 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:52,909 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-13 12:44:52,910 WARN L235 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:52,910 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-08-13 12:44:52,915 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:52,915 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:52,916 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:52,916 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:52,916 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:52,917 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:52,917 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:52,917 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:52,917 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:52,917 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:52,917 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 16 places, 11 transitions, 34 flow [2021-08-13 12:44:52,920 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-08-13 12:44:52,921 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:52,921 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 39 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. [2021-08-13 12:44:52,921 INFO L82 GeneralOperation]: Start removeDead. Operand has 16 places, 11 transitions, 34 flow [2021-08-13 12:44:52,921 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 9 transitions, 30 flow [2021-08-13 12:44:52,922 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:44:52,922 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:52,922 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:52,922 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:52,922 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:52,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:52,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1667, now seen corresponding path program 1 times [2021-08-13 12:44:52,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:52,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355499525] [2021-08-13 12:44:52,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:52,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:52,930 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:52,948 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:52,953 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:52,953 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:52,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355499525] [2021-08-13 12:44:52,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355499525] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:52,954 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:52,954 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:52,954 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708591912] [2021-08-13 12:44:52,954 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:52,954 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:52,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:52,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:52,955 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 11 [2021-08-13 12:44:52,955 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 14 places, 9 transitions, 30 flow. Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:52,955 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:52,955 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 11 [2021-08-13 12:44:52,955 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:52,971 INFO L129 PetriNetUnfolder]: 1/11 cut-off events. [2021-08-13 12:44:52,971 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:52,972 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 11 events. 1/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 13 event pairs, 1 based on Foata normal form. 6/16 useless extension candidates. Maximal degree in co-relation 11. Up to 5 conditions per place. [2021-08-13 12:44:52,972 INFO L132 encePairwiseOnDemand]: 9/11 looper letters, 2 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2021-08-13 12:44:52,973 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 15 places, 8 transitions, 34 flow [2021-08-13 12:44:52,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:52,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:52,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 22 transitions. [2021-08-13 12:44:52,975 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.6666666666666666 [2021-08-13 12:44:52,975 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 22 transitions. [2021-08-13 12:44:52,975 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 22 transitions. [2021-08-13 12:44:52,975 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:52,976 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 22 transitions. [2021-08-13 12:44:52,976 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) [2021-08-13 12:44:52,976 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 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) [2021-08-13 12:44:52,977 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 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) [2021-08-13 12:44:52,977 INFO L348 CegarLoopForPetriNet]: 14 programPoint places, 1 predicate places. [2021-08-13 12:44:52,977 INFO L482 AbstractCegarLoop]: Abstraction has has 15 places, 8 transitions, 34 flow [2021-08-13 12:44:52,977 INFO L483 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) [2021-08-13 12:44:52,977 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:52,978 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-08-13 12:44:52,978 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-13 12:44:52,978 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:52,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:52,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1612715, now seen corresponding path program 1 times [2021-08-13 12:44:52,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:52,979 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145070227] [2021-08-13 12:44:52,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:52,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:52,988 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:52,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:52,990 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:52,991 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:52,991 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:52,991 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-13 12:44:52,991 WARN L235 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:52,991 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-08-13 12:44:53,035 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:53,035 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:53,036 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:53,036 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:53,036 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:53,036 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:53,036 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:53,037 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:53,037 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:53,037 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:53,037 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 14 transitions, 49 flow [2021-08-13 12:44:53,040 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-08-13 12:44:53,041 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,041 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 66 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. [2021-08-13 12:44:53,041 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 14 transitions, 49 flow [2021-08-13 12:44:53,041 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 19 places, 12 transitions, 45 flow [2021-08-13 12:44:53,042 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-08-13 12:44:53,042 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,042 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,042 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:53,042 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,042 INFO L82 PathProgramCache]: Analyzing trace with hash 2115, now seen corresponding path program 1 times [2021-08-13 12:44:53,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008120696] [2021-08-13 12:44:53,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:53,047 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:53,047 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:53,050 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:53,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:53,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008120696] [2021-08-13 12:44:53,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008120696] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:53,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:53,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:53,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958227393] [2021-08-13 12:44:53,051 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:53,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:53,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:53,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:53,052 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 14 [2021-08-13 12:44:53,052 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 19 places, 12 transitions, 45 flow. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:53,052 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:53,052 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 14 [2021-08-13 12:44:53,052 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:53,081 INFO L129 PetriNetUnfolder]: 5/24 cut-off events. [2021-08-13 12:44:53,082 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,082 INFO L84 FinitePrefix]: Finished finitePrefix Result has 54 conditions, 24 events. 5/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 58 event pairs, 5 based on Foata normal form. 11/32 useless extension candidates. Maximal degree in co-relation 31. Up to 13 conditions per place. [2021-08-13 12:44:53,082 INFO L132 encePairwiseOnDemand]: 12/14 looper letters, 3 selfloop transitions, 1 changer transitions 0/11 dead transitions. [2021-08-13 12:44:53,083 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 20 places, 11 transitions, 51 flow [2021-08-13 12:44:53,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:53,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:53,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 29 transitions. [2021-08-13 12:44:53,084 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.6904761904761905 [2021-08-13 12:44:53,084 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 29 transitions. [2021-08-13 12:44:53,084 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 29 transitions. [2021-08-13 12:44:53,084 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:53,084 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 29 transitions. [2021-08-13 12:44:53,084 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) [2021-08-13 12:44:53,085 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 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) [2021-08-13 12:44:53,085 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 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) [2021-08-13 12:44:53,085 INFO L348 CegarLoopForPetriNet]: 19 programPoint places, 1 predicate places. [2021-08-13 12:44:53,085 INFO L482 AbstractCegarLoop]: Abstraction has has 20 places, 11 transitions, 51 flow [2021-08-13 12:44:53,085 INFO L483 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) [2021-08-13 12:44:53,085 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,085 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-08-13 12:44:53,086 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-08-13 12:44:53,086 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,086 INFO L82 PathProgramCache]: Analyzing trace with hash 63416129, now seen corresponding path program 1 times [2021-08-13 12:44:53,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175239351] [2021-08-13 12:44:53,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,089 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,091 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,092 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:53,092 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:53,092 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-08-13 12:44:53,092 WARN L235 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:53,092 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-08-13 12:44:53,107 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:53,107 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:53,108 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:53,108 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:53,108 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:53,108 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:53,108 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:53,108 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:53,108 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:53,108 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:53,109 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 17 transitions, 66 flow [2021-08-13 12:44:53,113 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-08-13 12:44:53,113 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,113 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 90 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. [2021-08-13 12:44:53,113 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 17 transitions, 66 flow [2021-08-13 12:44:53,114 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 15 transitions, 62 flow [2021-08-13 12:44:53,115 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:44:53,115 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,115 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,115 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:53,115 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,115 INFO L82 PathProgramCache]: Analyzing trace with hash 2659, now seen corresponding path program 1 times [2021-08-13 12:44:53,115 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074890336] [2021-08-13 12:44:53,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:53,120 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:53,120 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:53,123 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:53,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:53,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074890336] [2021-08-13 12:44:53,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074890336] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:53,124 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:53,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:53,124 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918863850] [2021-08-13 12:44:53,124 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:53,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:53,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:53,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:53,125 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 17 [2021-08-13 12:44:53,125 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 15 transitions, 62 flow. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:53,125 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:53,125 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 17 [2021-08-13 12:44:53,125 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:53,160 INFO L129 PetriNetUnfolder]: 17/53 cut-off events. [2021-08-13 12:44:53,160 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,161 INFO L84 FinitePrefix]: Finished finitePrefix Result has 110 conditions, 53 events. 17/53 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 12. Compared 197 event pairs, 17 based on Foata normal form. 20/67 useless extension candidates. Maximal degree in co-relation 79. Up to 33 conditions per place. [2021-08-13 12:44:53,161 INFO L132 encePairwiseOnDemand]: 15/17 looper letters, 4 selfloop transitions, 1 changer transitions 0/14 dead transitions. [2021-08-13 12:44:53,162 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 14 transitions, 70 flow [2021-08-13 12:44:53,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:53,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:53,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 36 transitions. [2021-08-13 12:44:53,163 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7058823529411765 [2021-08-13 12:44:53,163 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 36 transitions. [2021-08-13 12:44:53,163 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 36 transitions. [2021-08-13 12:44:53,163 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:53,163 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 36 transitions. [2021-08-13 12:44:53,163 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) [2021-08-13 12:44:53,164 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) [2021-08-13 12:44:53,164 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) [2021-08-13 12:44:53,164 INFO L348 CegarLoopForPetriNet]: 24 programPoint places, 1 predicate places. [2021-08-13 12:44:53,164 INFO L482 AbstractCegarLoop]: Abstraction has has 25 places, 14 transitions, 70 flow [2021-08-13 12:44:53,164 INFO L483 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) [2021-08-13 12:44:53,164 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,164 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-08-13 12:44:53,165 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-08-13 12:44:53,165 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1824239762, now seen corresponding path program 1 times [2021-08-13 12:44:53,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379827185] [2021-08-13 12:44:53,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,169 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,172 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,173 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:53,174 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:53,174 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-08-13 12:44:53,174 WARN L235 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:53,174 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-08-13 12:44:53,195 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:53,195 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:53,196 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:53,196 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:53,196 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:53,196 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:53,196 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:53,196 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:53,196 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:53,196 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:53,197 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 20 transitions, 85 flow [2021-08-13 12:44:53,201 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-08-13 12:44:53,202 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,202 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. [2021-08-13 12:44:53,202 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 20 transitions, 85 flow [2021-08-13 12:44:53,202 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 18 transitions, 81 flow [2021-08-13 12:44:53,203 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:44:53,203 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,203 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,203 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:53,203 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,204 INFO L82 PathProgramCache]: Analyzing trace with hash 3299, now seen corresponding path program 1 times [2021-08-13 12:44:53,204 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,204 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260443552] [2021-08-13 12:44:53,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:53,211 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:53,212 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:53,217 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:53,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:53,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260443552] [2021-08-13 12:44:53,219 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1260443552] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:53,219 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:53,219 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:53,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623854282] [2021-08-13 12:44:53,220 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:53,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:53,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:53,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:53,221 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 20 [2021-08-13 12:44:53,222 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 18 transitions, 81 flow. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:53,222 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:53,222 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 20 [2021-08-13 12:44:53,222 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:53,277 INFO L129 PetriNetUnfolder]: 49/118 cut-off events. [2021-08-13 12:44:53,277 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,278 INFO L84 FinitePrefix]: Finished finitePrefix Result has 231 conditions, 118 events. 49/118 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 527 event pairs, 49 based on Foata normal form. 37/142 useless extension candidates. Maximal degree in co-relation 191. Up to 81 conditions per place. [2021-08-13 12:44:53,279 INFO L132 encePairwiseOnDemand]: 18/20 looper letters, 5 selfloop transitions, 1 changer transitions 0/17 dead transitions. [2021-08-13 12:44:53,279 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 30 places, 17 transitions, 91 flow [2021-08-13 12:44:53,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:53,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:53,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 43 transitions. [2021-08-13 12:44:53,282 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7166666666666667 [2021-08-13 12:44:53,282 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 43 transitions. [2021-08-13 12:44:53,282 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 43 transitions. [2021-08-13 12:44:53,282 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:53,283 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 43 transitions. [2021-08-13 12:44:53,283 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) [2021-08-13 12:44:53,283 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 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) [2021-08-13 12:44:53,284 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 20.0) internal successors, (80), 4 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) [2021-08-13 12:44:53,284 INFO L348 CegarLoopForPetriNet]: 29 programPoint places, 1 predicate places. [2021-08-13 12:44:53,284 INFO L482 AbstractCegarLoop]: Abstraction has has 30 places, 17 transitions, 91 flow [2021-08-13 12:44:53,284 INFO L483 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) [2021-08-13 12:44:53,284 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,284 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:44:53,284 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-08-13 12:44:53,284 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,285 INFO L82 PathProgramCache]: Analyzing trace with hash 504182917, now seen corresponding path program 1 times [2021-08-13 12:44:53,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091819146] [2021-08-13 12:44:53,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,288 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,290 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,291 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:53,291 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:53,292 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-08-13 12:44:53,292 WARN L235 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:53,292 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-08-13 12:44:53,300 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:53,300 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:53,301 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:53,301 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:53,301 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:53,301 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:53,301 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:53,302 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:53,302 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:53,302 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:53,302 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 36 places, 23 transitions, 106 flow [2021-08-13 12:44:53,305 INFO L129 PetriNetUnfolder]: 0/41 cut-off events. [2021-08-13 12:44:53,306 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,306 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. [2021-08-13 12:44:53,306 INFO L82 GeneralOperation]: Start removeDead. Operand has 36 places, 23 transitions, 106 flow [2021-08-13 12:44:53,306 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 21 transitions, 102 flow [2021-08-13 12:44:53,307 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-08-13 12:44:53,307 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,307 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,307 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:53,307 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,307 INFO L82 PathProgramCache]: Analyzing trace with hash 4035, now seen corresponding path program 1 times [2021-08-13 12:44:53,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60852012] [2021-08-13 12:44:53,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:53,312 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:53,312 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:53,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:53,315 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:53,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60852012] [2021-08-13 12:44:53,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60852012] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:53,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:53,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:53,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788846443] [2021-08-13 12:44:53,315 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:53,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:53,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:53,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:53,316 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 23 [2021-08-13 12:44:53,316 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 34 places, 21 transitions, 102 flow. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:53,317 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:53,317 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 23 [2021-08-13 12:44:53,317 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:53,358 INFO L129 PetriNetUnfolder]: 129/263 cut-off events. [2021-08-13 12:44:53,358 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,359 INFO L84 FinitePrefix]: Finished finitePrefix Result has 497 conditions, 263 events. 129/263 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 40. Compared 1333 event pairs, 129 based on Foata normal form. 70/309 useless extension candidates. Maximal degree in co-relation 447. Up to 193 conditions per place. [2021-08-13 12:44:53,361 INFO L132 encePairwiseOnDemand]: 21/23 looper letters, 6 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2021-08-13 12:44:53,361 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 35 places, 20 transitions, 114 flow [2021-08-13 12:44:53,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:53,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:53,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 50 transitions. [2021-08-13 12:44:53,362 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7246376811594203 [2021-08-13 12:44:53,362 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 50 transitions. [2021-08-13 12:44:53,362 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 50 transitions. [2021-08-13 12:44:53,362 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:53,362 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 50 transitions. [2021-08-13 12:44:53,363 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) [2021-08-13 12:44:53,363 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 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) [2021-08-13 12:44:53,363 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 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) [2021-08-13 12:44:53,364 INFO L348 CegarLoopForPetriNet]: 34 programPoint places, 1 predicate places. [2021-08-13 12:44:53,364 INFO L482 AbstractCegarLoop]: Abstraction has has 35 places, 20 transitions, 114 flow [2021-08-13 12:44:53,364 INFO L483 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) [2021-08-13 12:44:53,364 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,364 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:44:53,364 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-08-13 12:44:53,364 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1332075505, now seen corresponding path program 1 times [2021-08-13 12:44:53,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163637505] [2021-08-13 12:44:53,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,368 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,370 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,372 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:53,372 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:53,372 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-08-13 12:44:53,372 WARN L235 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:53,372 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-08-13 12:44:53,405 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:53,405 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:53,406 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:53,406 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:53,406 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:53,406 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:53,406 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:53,406 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:53,406 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:53,406 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:53,407 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 26 transitions, 129 flow [2021-08-13 12:44:53,410 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-08-13 12:44:53,410 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,410 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. [2021-08-13 12:44:53,410 INFO L82 GeneralOperation]: Start removeDead. Operand has 41 places, 26 transitions, 129 flow [2021-08-13 12:44:53,411 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 39 places, 24 transitions, 125 flow [2021-08-13 12:44:53,411 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-08-13 12:44:53,411 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,411 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,411 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:53,411 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,412 INFO L82 PathProgramCache]: Analyzing trace with hash 4867, now seen corresponding path program 1 times [2021-08-13 12:44:53,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620066178] [2021-08-13 12:44:53,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:53,421 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:53,421 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:53,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:53,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:53,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620066178] [2021-08-13 12:44:53,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620066178] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:53,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:53,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:53,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615622723] [2021-08-13 12:44:53,426 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:53,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:53,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:53,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:53,427 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 26 [2021-08-13 12:44:53,427 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 39 places, 24 transitions, 125 flow. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:53,428 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:53,428 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 26 [2021-08-13 12:44:53,428 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:53,507 INFO L129 PetriNetUnfolder]: 321/584 cut-off events. [2021-08-13 12:44:53,508 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,510 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1084 conditions, 584 events. 321/584 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 78. Compared 3279 event pairs, 321 based on Foata normal form. 135/676 useless extension candidates. Maximal degree in co-relation 1023. Up to 449 conditions per place. [2021-08-13 12:44:53,514 INFO L132 encePairwiseOnDemand]: 24/26 looper letters, 7 selfloop transitions, 1 changer transitions 0/23 dead transitions. [2021-08-13 12:44:53,514 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 40 places, 23 transitions, 139 flow [2021-08-13 12:44:53,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:53,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:53,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 57 transitions. [2021-08-13 12:44:53,517 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7307692307692307 [2021-08-13 12:44:53,517 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 57 transitions. [2021-08-13 12:44:53,517 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 57 transitions. [2021-08-13 12:44:53,517 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:53,517 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 57 transitions. [2021-08-13 12:44:53,518 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) [2021-08-13 12:44:53,519 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 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) [2021-08-13 12:44:53,519 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 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) [2021-08-13 12:44:53,519 INFO L348 CegarLoopForPetriNet]: 39 programPoint places, 1 predicate places. [2021-08-13 12:44:53,519 INFO L482 AbstractCegarLoop]: Abstraction has has 40 places, 23 transitions, 139 flow [2021-08-13 12:44:53,519 INFO L483 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) [2021-08-13 12:44:53,519 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,519 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:44:53,519 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-08-13 12:44:53,519 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,520 INFO L82 PathProgramCache]: Analyzing trace with hash 58177429, now seen corresponding path program 1 times [2021-08-13 12:44:53,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866892032] [2021-08-13 12:44:53,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,531 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,540 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,546 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:53,546 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:53,546 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-08-13 12:44:53,546 WARN L235 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:53,546 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2021-08-13 12:44:53,578 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:53,578 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:53,579 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:53,579 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:53,579 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:53,579 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:53,579 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:53,579 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:53,579 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:53,579 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:53,580 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 29 transitions, 154 flow [2021-08-13 12:44:53,583 INFO L129 PetriNetUnfolder]: 0/53 cut-off events. [2021-08-13 12:44:53,583 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,583 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. [2021-08-13 12:44:53,583 INFO L82 GeneralOperation]: Start removeDead. Operand has 46 places, 29 transitions, 154 flow [2021-08-13 12:44:53,584 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 44 places, 27 transitions, 150 flow [2021-08-13 12:44:53,584 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:44:53,584 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,584 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,584 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:53,584 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,584 INFO L82 PathProgramCache]: Analyzing trace with hash 5795, now seen corresponding path program 1 times [2021-08-13 12:44:53,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591334287] [2021-08-13 12:44:53,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:53,589 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:53,589 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:53,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:53,591 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:53,591 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591334287] [2021-08-13 12:44:53,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591334287] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:53,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:53,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:53,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112307245] [2021-08-13 12:44:53,592 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:53,592 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:53,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:53,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:53,593 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 29 [2021-08-13 12:44:53,593 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 27 transitions, 150 flow. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:53,593 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:53,593 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 29 [2021-08-13 12:44:53,593 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:53,731 INFO L129 PetriNetUnfolder]: 769/1289 cut-off events. [2021-08-13 12:44:53,732 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,735 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2376 conditions, 1289 events. 769/1289 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 154. Compared 7751 event pairs, 769 based on Foata normal form. 264/1478 useless extension candidates. Maximal degree in co-relation 2303. Up to 1025 conditions per place. [2021-08-13 12:44:53,741 INFO L132 encePairwiseOnDemand]: 27/29 looper letters, 8 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2021-08-13 12:44:53,741 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 26 transitions, 166 flow [2021-08-13 12:44:53,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:53,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:53,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 64 transitions. [2021-08-13 12:44:53,744 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.735632183908046 [2021-08-13 12:44:53,744 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 64 transitions. [2021-08-13 12:44:53,744 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 64 transitions. [2021-08-13 12:44:53,744 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:53,744 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 64 transitions. [2021-08-13 12:44:53,745 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) [2021-08-13 12:44:53,745 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) [2021-08-13 12:44:53,745 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) [2021-08-13 12:44:53,745 INFO L348 CegarLoopForPetriNet]: 44 programPoint places, 1 predicate places. [2021-08-13 12:44:53,745 INFO L482 AbstractCegarLoop]: Abstraction has has 45 places, 26 transitions, 166 flow [2021-08-13 12:44:53,746 INFO L483 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) [2021-08-13 12:44:53,746 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,746 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:44:53,747 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-08-13 12:44:53,747 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,751 INFO L82 PathProgramCache]: Analyzing trace with hash 1055505844, now seen corresponding path program 1 times [2021-08-13 12:44:53,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,751 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976789372] [2021-08-13 12:44:53,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,758 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:53,765 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:53,769 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:53,770 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:53,770 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-08-13 12:44:53,771 WARN L235 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:53,771 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2021-08-13 12:44:53,786 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:53,787 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:53,788 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:53,788 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:53,788 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:53,788 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:53,788 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:53,788 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:53,788 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:53,788 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:53,791 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 51 places, 32 transitions, 181 flow [2021-08-13 12:44:53,797 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-08-13 12:44:53,797 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,797 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 216 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. [2021-08-13 12:44:53,797 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 32 transitions, 181 flow [2021-08-13 12:44:53,799 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 30 transitions, 177 flow [2021-08-13 12:44:53,799 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-08-13 12:44:53,800 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:53,800 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:53,800 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:53,800 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:53,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:53,802 INFO L82 PathProgramCache]: Analyzing trace with hash 6819, now seen corresponding path program 1 times [2021-08-13 12:44:53,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:53,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629378283] [2021-08-13 12:44:53,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:53,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:53,813 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:53,814 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:53,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:53,818 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:53,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629378283] [2021-08-13 12:44:53,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629378283] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:53,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:53,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:53,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030644842] [2021-08-13 12:44:53,819 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:53,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:53,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:53,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:53,821 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 32 [2021-08-13 12:44:53,821 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 49 places, 30 transitions, 177 flow. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:53,821 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:53,821 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 32 [2021-08-13 12:44:53,821 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:54,003 INFO L129 PetriNetUnfolder]: 1793/2826 cut-off events. [2021-08-13 12:44:54,003 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:54,016 INFO L84 FinitePrefix]: Finished finitePrefix Result has 5205 conditions, 2826 events. 1793/2826 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 300. Compared 17761 event pairs, 1793 based on Foata normal form. 521/3216 useless extension candidates. Maximal degree in co-relation 5119. Up to 2305 conditions per place. [2021-08-13 12:44:54,029 INFO L132 encePairwiseOnDemand]: 30/32 looper letters, 9 selfloop transitions, 1 changer transitions 0/29 dead transitions. [2021-08-13 12:44:54,030 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 50 places, 29 transitions, 195 flow [2021-08-13 12:44:54,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:54,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:54,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 71 transitions. [2021-08-13 12:44:54,031 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7395833333333334 [2021-08-13 12:44:54,031 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 71 transitions. [2021-08-13 12:44:54,032 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 71 transitions. [2021-08-13 12:44:54,032 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:54,032 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 71 transitions. [2021-08-13 12:44:54,032 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) [2021-08-13 12:44:54,034 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 32.0) internal successors, (128), 4 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:54,034 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 32.0) internal successors, (128), 4 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:54,034 INFO L348 CegarLoopForPetriNet]: 49 programPoint places, 1 predicate places. [2021-08-13 12:44:54,034 INFO L482 AbstractCegarLoop]: Abstraction has has 50 places, 29 transitions, 195 flow [2021-08-13 12:44:54,034 INFO L483 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) [2021-08-13 12:44:54,034 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:54,034 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:44:54,034 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-08-13 12:44:54,034 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:54,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:54,035 INFO L82 PathProgramCache]: Analyzing trace with hash 1814808561, now seen corresponding path program 1 times [2021-08-13 12:44:54,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:54,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841533159] [2021-08-13 12:44:54,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:54,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:54,042 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:54,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:54,050 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:54,051 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:54,052 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:54,052 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-08-13 12:44:54,052 WARN L235 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:54,052 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2021-08-13 12:44:54,069 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:54,069 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:54,070 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:54,070 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:54,070 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:54,070 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:54,070 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:54,070 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:54,070 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:54,070 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:54,072 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 56 places, 35 transitions, 210 flow [2021-08-13 12:44:54,076 INFO L129 PetriNetUnfolder]: 0/65 cut-off events. [2021-08-13 12:44:54,076 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:54,076 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. [2021-08-13 12:44:54,076 INFO L82 GeneralOperation]: Start removeDead. Operand has 56 places, 35 transitions, 210 flow [2021-08-13 12:44:54,077 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 54 places, 33 transitions, 206 flow [2021-08-13 12:44:54,077 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-08-13 12:44:54,077 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:54,078 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:54,078 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:54,078 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:54,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:54,078 INFO L82 PathProgramCache]: Analyzing trace with hash 7939, now seen corresponding path program 1 times [2021-08-13 12:44:54,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:54,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846253833] [2021-08-13 12:44:54,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:54,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:54,098 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:54,099 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:54,101 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:54,101 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:54,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846253833] [2021-08-13 12:44:54,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846253833] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:54,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:54,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:54,102 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322015198] [2021-08-13 12:44:54,102 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:54,102 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:54,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:54,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:54,103 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 35 [2021-08-13 12:44:54,103 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 54 places, 33 transitions, 206 flow. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:54,103 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:54,103 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 35 [2021-08-13 12:44:54,103 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:54,656 INFO L129 PetriNetUnfolder]: 4097/6155 cut-off events. [2021-08-13 12:44:54,657 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:54,677 INFO L84 FinitePrefix]: Finished finitePrefix Result has 11363 conditions, 6155 events. 4097/6155 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 592. Compared 39939 event pairs, 4097 based on Foata normal form. 1034/6972 useless extension candidates. Maximal degree in co-relation 11263. Up to 5121 conditions per place. [2021-08-13 12:44:54,707 INFO L132 encePairwiseOnDemand]: 33/35 looper letters, 10 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2021-08-13 12:44:54,707 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 55 places, 32 transitions, 226 flow [2021-08-13 12:44:54,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:54,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:54,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 78 transitions. [2021-08-13 12:44:54,721 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7428571428571429 [2021-08-13 12:44:54,721 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 78 transitions. [2021-08-13 12:44:54,721 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 78 transitions. [2021-08-13 12:44:54,721 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:54,721 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 78 transitions. [2021-08-13 12:44:54,722 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) [2021-08-13 12:44:54,722 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:54,722 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:54,722 INFO L348 CegarLoopForPetriNet]: 54 programPoint places, 1 predicate places. [2021-08-13 12:44:54,722 INFO L482 AbstractCegarLoop]: Abstraction has has 55 places, 32 transitions, 226 flow [2021-08-13 12:44:54,722 INFO L483 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) [2021-08-13 12:44:54,722 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:54,722 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:44:54,723 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-08-13 12:44:54,723 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:54,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:54,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1379283255, now seen corresponding path program 1 times [2021-08-13 12:44:54,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:54,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399122820] [2021-08-13 12:44:54,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:54,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:54,730 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:54,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:54,733 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:54,737 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:54,737 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:54,737 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-08-13 12:44:54,738 WARN L235 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:54,738 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2021-08-13 12:44:54,758 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:54,796 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:54,797 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:54,797 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:54,797 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:54,797 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:54,797 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:54,797 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:54,797 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:54,797 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:54,797 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 38 transitions, 241 flow [2021-08-13 12:44:54,801 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-08-13 12:44:54,801 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:54,801 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. [2021-08-13 12:44:54,801 INFO L82 GeneralOperation]: Start removeDead. Operand has 61 places, 38 transitions, 241 flow [2021-08-13 12:44:54,801 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 36 transitions, 237 flow [2021-08-13 12:44:54,802 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:44:54,802 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:54,802 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:54,802 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:54,802 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:54,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:54,802 INFO L82 PathProgramCache]: Analyzing trace with hash 9155, now seen corresponding path program 1 times [2021-08-13 12:44:54,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:54,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741825435] [2021-08-13 12:44:54,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:54,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:54,807 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:54,807 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:54,809 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:54,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:54,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741825435] [2021-08-13 12:44:54,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741825435] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:54,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:54,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:54,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324557343] [2021-08-13 12:44:54,810 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:54,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:54,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:54,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:54,811 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 38 [2021-08-13 12:44:54,811 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 59 places, 36 transitions, 237 flow. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:54,811 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:54,811 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 38 [2021-08-13 12:44:54,811 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:55,720 INFO L129 PetriNetUnfolder]: 9217/13324 cut-off events. [2021-08-13 12:44:55,720 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:55,776 INFO L84 FinitePrefix]: Finished finitePrefix Result has 24690 conditions, 13324 events. 9217/13324 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1159. Compared 89630 event pairs, 9217 based on Foata normal form. 2059/15024 useless extension candidates. Maximal degree in co-relation 24575. Up to 11265 conditions per place. [2021-08-13 12:44:55,877 INFO L132 encePairwiseOnDemand]: 36/38 looper letters, 11 selfloop transitions, 1 changer transitions 0/35 dead transitions. [2021-08-13 12:44:55,877 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 60 places, 35 transitions, 259 flow [2021-08-13 12:44:55,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:55,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:55,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 85 transitions. [2021-08-13 12:44:55,878 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7456140350877193 [2021-08-13 12:44:55,878 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 85 transitions. [2021-08-13 12:44:55,878 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 85 transitions. [2021-08-13 12:44:55,878 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:55,878 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 85 transitions. [2021-08-13 12:44:55,879 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) [2021-08-13 12:44:55,879 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 38.0) internal successors, (152), 4 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:55,879 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 38.0) internal successors, (152), 4 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:44:55,879 INFO L348 CegarLoopForPetriNet]: 59 programPoint places, 1 predicate places. [2021-08-13 12:44:55,879 INFO L482 AbstractCegarLoop]: Abstraction has has 60 places, 35 transitions, 259 flow [2021-08-13 12:44:55,879 INFO L483 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) [2021-08-13 12:44:55,879 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:55,879 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:44:55,879 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-08-13 12:44:55,880 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:55,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:55,880 INFO L82 PathProgramCache]: Analyzing trace with hash -279163623, now seen corresponding path program 1 times [2021-08-13 12:44:55,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:55,880 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308917113] [2021-08-13 12:44:55,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:55,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:55,883 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:55,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:55,884 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:55,886 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:55,886 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:55,887 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-08-13 12:44:55,887 WARN L235 ceAbstractionStarter]: 11 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:55,887 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 12 thread instances. [2021-08-13 12:44:55,898 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:55,898 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:55,899 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:55,899 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:55,899 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:55,899 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:55,899 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:55,899 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:55,899 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:55,899 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:55,899 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 66 places, 41 transitions, 274 flow [2021-08-13 12:44:55,903 INFO L129 PetriNetUnfolder]: 0/77 cut-off events. [2021-08-13 12:44:55,903 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:55,903 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 280 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. [2021-08-13 12:44:55,903 INFO L82 GeneralOperation]: Start removeDead. Operand has 66 places, 41 transitions, 274 flow [2021-08-13 12:44:55,904 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 39 transitions, 270 flow [2021-08-13 12:44:55,904 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:44:55,904 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:55,904 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:55,904 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:55,904 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:55,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:55,905 INFO L82 PathProgramCache]: Analyzing trace with hash 10467, now seen corresponding path program 1 times [2021-08-13 12:44:55,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:55,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577342811] [2021-08-13 12:44:55,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:55,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:55,908 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:55,909 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:55,910 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:55,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:55,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577342811] [2021-08-13 12:44:55,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577342811] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:55,911 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:55,911 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:55,911 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379784320] [2021-08-13 12:44:55,911 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:55,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:55,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:55,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:55,912 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 41 [2021-08-13 12:44:55,912 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 39 transitions, 270 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) [2021-08-13 12:44:55,912 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:55,912 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 41 [2021-08-13 12:44:55,912 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:44:58,278 INFO L129 PetriNetUnfolder]: 20481/28685 cut-off events. [2021-08-13 12:44:58,278 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:58,524 INFO L84 FinitePrefix]: Finished finitePrefix Result has 53378 conditions, 28685 events. 20481/28685 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2277. Compared 197641 event pairs, 20481 based on Foata normal form. 4108/32201 useless extension candidates. Maximal degree in co-relation 53247. Up to 24577 conditions per place. [2021-08-13 12:44:58,671 INFO L132 encePairwiseOnDemand]: 39/41 looper letters, 12 selfloop transitions, 1 changer transitions 0/38 dead transitions. [2021-08-13 12:44:58,671 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 38 transitions, 294 flow [2021-08-13 12:44:58,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:44:58,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:44:58,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 92 transitions. [2021-08-13 12:44:58,672 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7479674796747967 [2021-08-13 12:44:58,672 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 92 transitions. [2021-08-13 12:44:58,672 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 92 transitions. [2021-08-13 12:44:58,672 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:44:58,672 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 92 transitions. [2021-08-13 12:44:58,673 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) [2021-08-13 12:44:58,673 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) [2021-08-13 12:44:58,673 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) [2021-08-13 12:44:58,673 INFO L348 CegarLoopForPetriNet]: 64 programPoint places, 1 predicate places. [2021-08-13 12:44:58,673 INFO L482 AbstractCegarLoop]: Abstraction has has 65 places, 38 transitions, 294 flow [2021-08-13 12:44:58,673 INFO L483 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) [2021-08-13 12:44:58,673 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:58,673 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:44:58,674 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-08-13 12:44:58,674 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:58,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:58,674 INFO L82 PathProgramCache]: Analyzing trace with hash 387658490, now seen corresponding path program 1 times [2021-08-13 12:44:58,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:58,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184644746] [2021-08-13 12:44:58,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:58,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:58,687 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:58,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:44:58,689 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:44:58,691 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:44:58,691 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:44:58,691 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-08-13 12:44:58,691 WARN L235 ceAbstractionStarter]: 12 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:44:58,691 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 13 thread instances. [2021-08-13 12:44:58,710 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:44:58,711 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:44:58,712 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:44:58,712 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:44:58,712 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:44:58,712 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:44:58,712 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:44:58,712 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:44:58,712 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:44:58,712 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:44:58,714 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 71 places, 44 transitions, 309 flow [2021-08-13 12:44:58,721 INFO L129 PetriNetUnfolder]: 0/83 cut-off events. [2021-08-13 12:44:58,722 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:58,722 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 309 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. [2021-08-13 12:44:58,722 INFO L82 GeneralOperation]: Start removeDead. Operand has 71 places, 44 transitions, 309 flow [2021-08-13 12:44:58,722 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 69 places, 42 transitions, 305 flow [2021-08-13 12:44:58,723 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:44:58,723 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:44:58,723 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:44:58,723 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:44:58,723 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:44:58,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:44:58,724 INFO L82 PathProgramCache]: Analyzing trace with hash 11875, now seen corresponding path program 1 times [2021-08-13 12:44:58,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:44:58,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18551828] [2021-08-13 12:44:58,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:44:58,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:44:58,731 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:44:58,732 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:44:58,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:44:58,735 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:44:58,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18551828] [2021-08-13 12:44:58,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18551828] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:44:58,735 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:44:58,735 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:44:58,735 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206743274] [2021-08-13 12:44:58,735 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:44:58,735 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:44:58,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:44:58,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:44:58,736 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 44 [2021-08-13 12:44:58,736 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 69 places, 42 transitions, 305 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) [2021-08-13 12:44:58,736 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:44:58,736 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 44 [2021-08-13 12:44:58,736 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:45:04,360 INFO L129 PetriNetUnfolder]: 45057/61454 cut-off events. [2021-08-13 12:45:04,360 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:45:05,140 INFO L84 FinitePrefix]: Finished finitePrefix Result has 114835 conditions, 61454 events. 45057/61454 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4476. Compared 431033 event pairs, 45057 based on Foata normal form. 8205/68691 useless extension candidates. Maximal degree in co-relation 114687. Up to 53249 conditions per place. [2021-08-13 12:45:05,396 INFO L132 encePairwiseOnDemand]: 42/44 looper letters, 13 selfloop transitions, 1 changer transitions 0/41 dead transitions. [2021-08-13 12:45:05,396 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 70 places, 41 transitions, 331 flow [2021-08-13 12:45:05,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:45:05,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:45:05,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2021-08-13 12:45:05,397 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.75 [2021-08-13 12:45:05,397 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 99 transitions. [2021-08-13 12:45:05,397 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 99 transitions. [2021-08-13 12:45:05,397 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:45:05,397 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 99 transitions. [2021-08-13 12:45:05,398 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) [2021-08-13 12:45:05,399 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 44.0) internal successors, (176), 4 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:45:05,399 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 44.0) internal successors, (176), 4 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:45:05,399 INFO L348 CegarLoopForPetriNet]: 69 programPoint places, 1 predicate places. [2021-08-13 12:45:05,399 INFO L482 AbstractCegarLoop]: Abstraction has has 70 places, 41 transitions, 331 flow [2021-08-13 12:45:05,399 INFO L483 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) [2021-08-13 12:45:05,399 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:45:05,399 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:45:05,400 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-08-13 12:45:05,400 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:45:05,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:45:05,400 INFO L82 PathProgramCache]: Analyzing trace with hash -656774515, now seen corresponding path program 1 times [2021-08-13 12:45:05,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:45:05,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092946426] [2021-08-13 12:45:05,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:45:05,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:45:05,413 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:45:05,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:45:05,415 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:45:05,417 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:45:05,417 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:45:05,417 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-08-13 12:45:05,417 WARN L235 ceAbstractionStarter]: 13 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:45:05,417 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 14 thread instances. [2021-08-13 12:45:05,432 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:45:05,433 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:45:05,435 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:45:05,435 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:45:05,435 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:45:05,435 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:45:05,435 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:45:05,435 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:45:05,435 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:45:05,435 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:45:05,436 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 76 places, 47 transitions, 346 flow [2021-08-13 12:45:05,439 INFO L129 PetriNetUnfolder]: 0/89 cut-off events. [2021-08-13 12:45:05,439 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:45:05,439 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 343 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. [2021-08-13 12:45:05,440 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 47 transitions, 346 flow [2021-08-13 12:45:05,440 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 74 places, 45 transitions, 342 flow [2021-08-13 12:45:05,440 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-08-13 12:45:05,440 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:45:05,440 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:45:05,440 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:45:05,441 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:45:05,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:45:05,441 INFO L82 PathProgramCache]: Analyzing trace with hash 13379, now seen corresponding path program 1 times [2021-08-13 12:45:05,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:45:05,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210374415] [2021-08-13 12:45:05,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:45:05,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:45:05,446 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:45:05,446 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:45:05,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:45:05,448 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:45:05,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210374415] [2021-08-13 12:45:05,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210374415] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:45:05,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:45:05,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:45:05,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588935009] [2021-08-13 12:45:05,448 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:45:05,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:45:05,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:45:05,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:45:05,450 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 47 [2021-08-13 12:45:05,450 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 74 places, 45 transitions, 342 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) [2021-08-13 12:45:05,450 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:45:05,450 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 47 [2021-08-13 12:45:05,450 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:45:20,911 INFO L129 PetriNetUnfolder]: 98305/131087 cut-off events. [2021-08-13 12:45:20,911 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:45:22,796 INFO L84 FinitePrefix]: Finished finitePrefix Result has 245925 conditions, 131087 events. 98305/131087 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8786. Compared 936954 event pairs, 98305 based on Foata normal form. 16398/145913 useless extension candidates. Maximal degree in co-relation 245759. Up to 114689 conditions per place. [2021-08-13 12:45:23,407 INFO L132 encePairwiseOnDemand]: 45/47 looper letters, 14 selfloop transitions, 1 changer transitions 0/44 dead transitions. [2021-08-13 12:45:23,408 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 75 places, 44 transitions, 370 flow [2021-08-13 12:45:23,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:45:23,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:45:23,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 106 transitions. [2021-08-13 12:45:23,409 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.75177304964539 [2021-08-13 12:45:23,409 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 106 transitions. [2021-08-13 12:45:23,409 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 106 transitions. [2021-08-13 12:45:23,409 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:45:23,409 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 106 transitions. [2021-08-13 12:45:23,409 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) [2021-08-13 12:45:23,410 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 47.0) internal successors, (188), 4 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:45:23,410 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 47.0) internal successors, (188), 4 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:45:23,410 INFO L348 CegarLoopForPetriNet]: 74 programPoint places, 1 predicate places. [2021-08-13 12:45:23,410 INFO L482 AbstractCegarLoop]: Abstraction has has 75 places, 44 transitions, 370 flow [2021-08-13 12:45:23,410 INFO L483 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) [2021-08-13 12:45:23,410 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:45:23,410 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:45:23,410 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-08-13 12:45:23,410 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:45:23,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:45:23,410 INFO L82 PathProgramCache]: Analyzing trace with hash 910327677, now seen corresponding path program 1 times [2021-08-13 12:45:23,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:45:23,411 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814762317] [2021-08-13 12:45:23,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:45:23,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:45:23,414 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:45:23,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:45:23,415 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:45:23,417 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:45:23,417 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:45:23,417 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-08-13 12:45:23,417 WARN L235 ceAbstractionStarter]: 14 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:45:23,417 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 15 thread instances. [2021-08-13 12:45:23,443 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:45:23,443 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:45:23,444 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:45:23,444 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:45:23,444 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:45:23,444 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:45:23,444 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:45:23,444 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:45:23,444 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:45:23,444 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:45:23,445 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 81 places, 50 transitions, 385 flow [2021-08-13 12:45:23,449 INFO L129 PetriNetUnfolder]: 0/95 cut-off events. [2021-08-13 12:45:23,449 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:45:23,449 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 298 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. [2021-08-13 12:45:23,449 INFO L82 GeneralOperation]: Start removeDead. Operand has 81 places, 50 transitions, 385 flow [2021-08-13 12:45:23,450 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 79 places, 48 transitions, 381 flow [2021-08-13 12:45:23,451 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-08-13 12:45:23,451 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:45:23,451 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:45:23,451 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:45:23,451 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:45:23,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:45:23,451 INFO L82 PathProgramCache]: Analyzing trace with hash 14979, now seen corresponding path program 1 times [2021-08-13 12:45:23,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:45:23,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105234568] [2021-08-13 12:45:23,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:45:23,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:45:23,465 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:45:23,465 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:45:23,467 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:45:23,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:45:23,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105234568] [2021-08-13 12:45:23,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105234568] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:45:23,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:45:23,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:45:23,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662831504] [2021-08-13 12:45:23,468 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:45:23,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:45:23,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:45:23,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:45:23,468 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 50 [2021-08-13 12:45:23,469 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 79 places, 48 transitions, 381 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) [2021-08-13 12:45:23,469 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:45:23,469 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 50 [2021-08-13 12:45:23,469 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 12:46:10,849 INFO L129 PetriNetUnfolder]: 212993/278544 cut-off events. [2021-08-13 12:46:10,850 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:46:15,314 INFO L84 FinitePrefix]: Finished finitePrefix Result has 524472 conditions, 278544 events. 212993/278544 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 17306. Compared 2008645 event pairs, 212993 based on Foata normal form. 32783/308766 useless extension candidates. Maximal degree in co-relation 524287. Up to 245761 conditions per place. [2021-08-13 12:46:16,536 INFO L132 encePairwiseOnDemand]: 48/50 looper letters, 15 selfloop transitions, 1 changer transitions 0/47 dead transitions. [2021-08-13 12:46:16,536 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 80 places, 47 transitions, 411 flow [2021-08-13 12:46:16,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-08-13 12:46:16,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-08-13 12:46:16,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 113 transitions. [2021-08-13 12:46:16,537 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.7533333333333333 [2021-08-13 12:46:16,537 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 113 transitions. [2021-08-13 12:46:16,537 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 113 transitions. [2021-08-13 12:46:16,537 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 12:46:16,537 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 113 transitions. [2021-08-13 12:46:16,537 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) [2021-08-13 12:46:16,537 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 50.0) internal successors, (200), 4 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:46:16,538 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 50.0) internal successors, (200), 4 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-08-13 12:46:16,538 INFO L348 CegarLoopForPetriNet]: 79 programPoint places, 1 predicate places. [2021-08-13 12:46:16,538 INFO L482 AbstractCegarLoop]: Abstraction has has 80 places, 47 transitions, 411 flow [2021-08-13 12:46:16,538 INFO L483 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) [2021-08-13 12:46:16,538 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:46:16,538 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 12:46:16,538 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-08-13 12:46:16,538 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:46:16,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:46:16,538 INFO L82 PathProgramCache]: Analyzing trace with hash 2024113101, now seen corresponding path program 1 times [2021-08-13 12:46:16,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:46:16,538 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813482454] [2021-08-13 12:46:16,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:46:16,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:46:16,541 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:46:16,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 12:46:16,543 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 12:46:16,544 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 12:46:16,544 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 12:46:16,544 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-08-13 12:46:16,545 WARN L235 ceAbstractionStarter]: 15 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 12:46:16,545 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 16 thread instances. [2021-08-13 12:46:16,571 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-08-13 12:46:16,572 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-08-13 12:46:16,572 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 12:46:16,572 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 12:46:16,572 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 12:46:16,572 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 12:46:16,572 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 12:46:16,572 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 12:46:16,573 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 12:46:16,573 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 12:46:16,573 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 86 places, 53 transitions, 426 flow [2021-08-13 12:46:16,577 INFO L129 PetriNetUnfolder]: 0/101 cut-off events. [2021-08-13 12:46:16,577 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:46:16,577 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. [2021-08-13 12:46:16,577 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 53 transitions, 426 flow [2021-08-13 12:46:16,578 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 84 places, 51 transitions, 422 flow [2021-08-13 12:46:16,578 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-08-13 12:46:16,578 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 12:46:16,578 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 12:46:16,578 INFO L266 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-08-13 12:46:16,578 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 12:46:16,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 12:46:16,578 INFO L82 PathProgramCache]: Analyzing trace with hash 16675, now seen corresponding path program 1 times [2021-08-13 12:46:16,578 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 12:46:16,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710669913] [2021-08-13 12:46:16,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 12:46:16,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 12:46:16,584 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 12:46:16,584 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 12:46:16,586 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 12:46:16,586 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 12:46:16,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710669913] [2021-08-13 12:46:16,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710669913] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 12:46:16,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 12:46:16,586 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-08-13 12:46:16,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533064575] [2021-08-13 12:46:16,587 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-08-13 12:46:16,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 12:46:16,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-08-13 12:46:16,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-08-13 12:46:16,587 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 34 out of 53 [2021-08-13 12:46:16,587 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 84 places, 51 transitions, 422 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) [2021-08-13 12:46:16,587 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 12:46:16,587 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 34 of 53 [2021-08-13 12:46:16,587 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand