/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-SemanticLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/showcase/PetersonWithBug.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-24 22:22:01,702 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-24 22:22:01,704 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-24 22:22:01,739 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-24 22:22:01,780 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-SemanticLbe.epf [2021-03-24 22:22:01,809 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-24 22:22:01,810 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-24 22:22:01,813 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-24 22:22:01,813 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-24 22:22:01,813 INFO L138 SettingsManager]: * Use SBE=true [2021-03-24 22:22:01,813 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-24 22:22:01,813 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-24 22:22:01,813 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-24 22:22:01,814 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-24 22:22:01,814 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-24 22:22:01,814 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-24 22:22:01,814 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-24 22:22:01,815 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-24 22:22:01,815 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-24 22:22:01,815 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-24 22:22:01,815 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-24 22:22:01,815 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-24 22:22:01,815 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-24 22:22:01,815 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-24 22:22:01,816 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-24 22:22:01,816 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-24 22:22:01,816 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 22:22:01,816 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-24 22:22:01,816 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-24 22:22:01,816 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-24 22:22:01,816 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-24 22:22:01,816 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-24 22:22:01,817 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-24 22:22:01,817 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-24 22:22:02,123 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-24 22:22:02,149 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-24 22:22:02,151 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-24 22:22:02,152 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-24 22:22:02,153 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-24 22:22:02,154 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/showcase/PetersonWithBug.bpl [2021-03-24 22:22:02,154 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/showcase/PetersonWithBug.bpl' [2021-03-24 22:22:02,192 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-24 22:22:02,193 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-24 22:22:02,194 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-24 22:22:02,194 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-24 22:22:02,194 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-24 22:22:02,206 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,211 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,217 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-24 22:22:02,218 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-24 22:22:02,218 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-24 22:22:02,219 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-24 22:22:02,224 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,225 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,225 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,225 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,227 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,229 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,229 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... [2021-03-24 22:22:02,230 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-24 22:22:02,231 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-24 22:22:02,231 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-24 22:22:02,231 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-24 22:22:02,232 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 22:22:02,290 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Process0 given in one single declaration [2021-03-24 22:22:02,290 INFO L130 BoogieDeclarations]: Found specification of procedure Process0 [2021-03-24 22:22:02,291 INFO L138 BoogieDeclarations]: Found implementation of procedure Process0 [2021-03-24 22:22:02,292 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Process1 given in one single declaration [2021-03-24 22:22:02,292 INFO L130 BoogieDeclarations]: Found specification of procedure Process1 [2021-03-24 22:22:02,293 INFO L138 BoogieDeclarations]: Found implementation of procedure Process1 [2021-03-24 22:22:02,293 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-24 22:22:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-24 22:22:02,293 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-24 22:22:02,294 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-24 22:22:02,426 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-24 22:22:02,426 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-03-24 22:22:02,427 INFO L202 PluginConnector]: Adding new model PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 10:22:02 BoogieIcfgContainer [2021-03-24 22:22:02,427 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-24 22:22:02,429 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-24 22:22:02,429 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-24 22:22:02,431 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-24 22:22:02,431 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:22:02" (1/2) ... [2021-03-24 22:22:02,441 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a862671 and model type PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.03 10:22:02, skipping insertion in model container [2021-03-24 22:22:02,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 10:22:02" (2/2) ... [2021-03-24 22:22:02,442 INFO L111 eAbstractionObserver]: Analyzing ICFG PetersonWithBug.bpl [2021-03-24 22:22:02,445 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-24 22:22:02,448 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2021-03-24 22:22:02,448 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-24 22:22:02,467 WARN L313 ript$VariableManager]: TermVariabe Process0Thread1of1ForFork0_x not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 22:22:02,468 WARN L313 ript$VariableManager]: TermVariabe Process0Thread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 22:22:02,476 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_a not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 22:22:02,476 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_b not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 22:22:02,479 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:22:02,493 INFO L253 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-03-24 22:22:02,511 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:22:02,511 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:22:02,511 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:22:02,511 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:22:02,512 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:22:02,512 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:22:02,512 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:22:02,512 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:22:02,520 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 26 transitions, 62 flow [2021-03-24 22:22:02,537 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-03-24 22:22:02,537 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:22:02,539 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 24 events. 2/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 40 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 24. Up to 2 conditions per place. [2021-03-24 22:22:02,539 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 26 transitions, 62 flow [2021-03-24 22:22:02,542 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 24 transitions, 54 flow [2021-03-24 22:22:02,544 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:22:02,554 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 24 transitions, 54 flow [2021-03-24 22:22:02,557 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 24 transitions, 54 flow [2021-03-24 22:22:02,558 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 24 transitions, 54 flow [2021-03-24 22:22:02,563 INFO L129 PetriNetUnfolder]: 2/24 cut-off events. [2021-03-24 22:22:02,563 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:22:02,564 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 24 events. 2/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 47 event pairs, 0 based on Foata normal form. 0/20 useless extension candidates. Maximal degree in co-relation 24. Up to 2 conditions per place. [2021-03-24 22:22:02,565 INFO L142 LiptonReduction]: Number of co-enabled transitions 260 [2021-03-24 22:22:02,713 INFO L154 LiptonReduction]: Checked pairs total: 107 [2021-03-24 22:22:02,714 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 22:22:02,716 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 173 [2021-03-24 22:22:02,738 INFO L129 PetriNetUnfolder]: 0/12 cut-off events. [2021-03-24 22:22:02,738 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:22:02,738 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:22:02,739 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-24 22:22:02,739 INFO L428 AbstractCegarLoop]: === Iteration 1 === [Process0Err0ASSERT_VIOLATIONASSERT, Process1Err0ASSERT_VIOLATIONASSERT, Process1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1INUSE_VIOLATION, Process0Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-03-24 22:22:02,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:22:02,743 INFO L82 PathProgramCache]: Analyzing trace with hash -1990965056, now seen corresponding path program 1 times [2021-03-24 22:22:02,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:22:02,757 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928592161] [2021-03-24 22:22:02,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:22:02,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:22:02,858 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:02,860 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:22:02,879 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 22:22:02,880 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928592161] [2021-03-24 22:22:02,880 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:22:02,880 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:22:02,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770834382] [2021-03-24 22:22:02,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:22:02,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:22:02,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:22:02,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:22:02,912 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 15 out of 30 [2021-03-24 22:22:02,914 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 25 places, 20 transitions, 46 flow. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:02,914 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:22:02,914 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 15 of 30 [2021-03-24 22:22:02,915 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:22:02,980 INFO L129 PetriNetUnfolder]: 19/64 cut-off events. [2021-03-24 22:22:02,980 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:22:02,981 INFO L84 FinitePrefix]: Finished finitePrefix Result has 112 conditions, 64 events. 19/64 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 153 event pairs, 1 based on Foata normal form. 12/72 useless extension candidates. Maximal degree in co-relation 103. Up to 26 conditions per place. [2021-03-24 22:22:02,983 INFO L132 encePairwiseOnDemand]: 19/30 looper letters, 8 selfloop transitions, 7 changer transitions 0/24 dead transitions. [2021-03-24 22:22:02,984 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 24 transitions, 84 flow [2021-03-24 22:22:02,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:22:02,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:22:02,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 66 transitions. [2021-03-24 22:22:02,994 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.7333333333333333 [2021-03-24 22:22:02,994 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 66 transitions. [2021-03-24 22:22:02,995 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 66 transitions. [2021-03-24 22:22:02,996 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:22:02,998 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 66 transitions. [2021-03-24 22:22:03,000 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,004 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,005 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,007 INFO L185 Difference]: Start difference. First operand has 25 places, 20 transitions, 46 flow. Second operand 3 states and 66 transitions. [2021-03-24 22:22:03,007 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 24 transitions, 84 flow [2021-03-24 22:22:03,009 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 23 places, 24 transitions, 82 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-24 22:22:03,012 INFO L241 Difference]: Finished difference. Result has 25 places, 24 transitions, 96 flow [2021-03-24 22:22:03,014 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=40, PETRI_DIFFERENCE_MINUEND_PLACES=21, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=96, PETRI_PLACES=25, PETRI_TRANSITIONS=24} [2021-03-24 22:22:03,014 INFO L343 CegarLoopForPetriNet]: 25 programPoint places, 0 predicate places. [2021-03-24 22:22:03,015 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 24 transitions, 96 flow [2021-03-24 22:22:03,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,015 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:22:03,015 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:22:03,016 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-24 22:22:03,016 INFO L428 AbstractCegarLoop]: === Iteration 2 === [Process0Err0ASSERT_VIOLATIONASSERT, Process1Err0ASSERT_VIOLATIONASSERT, Process1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1INUSE_VIOLATION, Process0Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-03-24 22:22:03,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:22:03,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1226902786, now seen corresponding path program 1 times [2021-03-24 22:22:03,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:22:03,017 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104947107] [2021-03-24 22:22:03,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:22:03,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:22:03,045 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:03,046 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 22:22:03,048 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:03,048 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:22:03,056 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:03,057 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 22:22:03,064 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:03,064 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 22:22:03,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 22:22:03,065 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104947107] [2021-03-24 22:22:03,065 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:22:03,065 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-24 22:22:03,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837186034] [2021-03-24 22:22:03,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 22:22:03,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:22:03,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 22:22:03,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 22:22:03,068 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 19 out of 30 [2021-03-24 22:22:03,068 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 25 places, 24 transitions, 96 flow. Second operand has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,068 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:22:03,068 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 19 of 30 [2021-03-24 22:22:03,068 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:22:03,097 INFO L129 PetriNetUnfolder]: 28/88 cut-off events. [2021-03-24 22:22:03,098 INFO L130 PetriNetUnfolder]: For 12/12 co-relation queries the response was YES. [2021-03-24 22:22:03,098 INFO L84 FinitePrefix]: Finished finitePrefix Result has 211 conditions, 88 events. 28/88 cut-off events. For 12/12 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 251 event pairs, 3 based on Foata normal form. 5/91 useless extension candidates. Maximal degree in co-relation 201. Up to 31 conditions per place. [2021-03-24 22:22:03,099 INFO L132 encePairwiseOnDemand]: 25/30 looper letters, 6 selfloop transitions, 7 changer transitions 0/30 dead transitions. [2021-03-24 22:22:03,099 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 28 places, 30 transitions, 140 flow [2021-03-24 22:22:03,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 22:22:03,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 22:22:03,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 88 transitions. [2021-03-24 22:22:03,101 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.7333333333333333 [2021-03-24 22:22:03,101 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 88 transitions. [2021-03-24 22:22:03,101 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 88 transitions. [2021-03-24 22:22:03,101 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:22:03,101 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 88 transitions. [2021-03-24 22:22:03,102 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,103 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 30.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,103 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 30.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,103 INFO L185 Difference]: Start difference. First operand has 25 places, 24 transitions, 96 flow. Second operand 4 states and 88 transitions. [2021-03-24 22:22:03,103 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 28 places, 30 transitions, 140 flow [2021-03-24 22:22:03,105 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 26 places, 30 transitions, 124 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-24 22:22:03,106 INFO L241 Difference]: Finished difference. Result has 28 places, 28 transitions, 123 flow [2021-03-24 22:22:03,106 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=82, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=123, PETRI_PLACES=28, PETRI_TRANSITIONS=28} [2021-03-24 22:22:03,107 INFO L343 CegarLoopForPetriNet]: 25 programPoint places, 3 predicate places. [2021-03-24 22:22:03,107 INFO L480 AbstractCegarLoop]: Abstraction has has 28 places, 28 transitions, 123 flow [2021-03-24 22:22:03,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,107 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:22:03,107 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:22:03,107 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-24 22:22:03,107 INFO L428 AbstractCegarLoop]: === Iteration 3 === [Process0Err0ASSERT_VIOLATIONASSERT, Process1Err0ASSERT_VIOLATIONASSERT, Process1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1INUSE_VIOLATION, Process0Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-03-24 22:22:03,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:22:03,108 INFO L82 PathProgramCache]: Analyzing trace with hash -791483276, now seen corresponding path program 2 times [2021-03-24 22:22:03,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:22:03,108 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575155183] [2021-03-24 22:22:03,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:22:03,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:22:03,121 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:03,121 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 22:22:03,122 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:03,122 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:22:03,127 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:03,127 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-24 22:22:03,140 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:22:03,141 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 22:22:03,141 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 22:22:03,141 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575155183] [2021-03-24 22:22:03,142 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:22:03,142 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-03-24 22:22:03,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654797234] [2021-03-24 22:22:03,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 22:22:03,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:22:03,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 22:22:03,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 22:22:03,144 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 19 out of 30 [2021-03-24 22:22:03,144 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 28 transitions, 123 flow. Second operand has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,144 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:22:03,144 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 19 of 30 [2021-03-24 22:22:03,144 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:22:03,167 INFO L129 PetriNetUnfolder]: 28/90 cut-off events. [2021-03-24 22:22:03,167 INFO L130 PetriNetUnfolder]: For 32/35 co-relation queries the response was YES. [2021-03-24 22:22:03,168 INFO L84 FinitePrefix]: Finished finitePrefix Result has 243 conditions, 90 events. 28/90 cut-off events. For 32/35 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 269 event pairs, 3 based on Foata normal form. 7/93 useless extension candidates. Maximal degree in co-relation 232. Up to 33 conditions per place. [2021-03-24 22:22:03,169 INFO L132 encePairwiseOnDemand]: 26/30 looper letters, 8 selfloop transitions, 7 changer transitions 0/34 dead transitions. [2021-03-24 22:22:03,169 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 34 transitions, 177 flow [2021-03-24 22:22:03,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 22:22:03,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 22:22:03,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 87 transitions. [2021-03-24 22:22:03,170 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.725 [2021-03-24 22:22:03,170 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 87 transitions. [2021-03-24 22:22:03,171 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 87 transitions. [2021-03-24 22:22:03,171 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:22:03,171 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 87 transitions. [2021-03-24 22:22:03,172 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,172 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 30.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,172 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 30.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,173 INFO L185 Difference]: Start difference. First operand has 28 places, 28 transitions, 123 flow. Second operand 4 states and 87 transitions. [2021-03-24 22:22:03,173 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 34 transitions, 177 flow [2021-03-24 22:22:03,174 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 30 places, 34 transitions, 172 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-24 22:22:03,175 INFO L241 Difference]: Finished difference. Result has 32 places, 32 transitions, 165 flow [2021-03-24 22:22:03,175 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=118, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=165, PETRI_PLACES=32, PETRI_TRANSITIONS=32} [2021-03-24 22:22:03,176 INFO L343 CegarLoopForPetriNet]: 25 programPoint places, 7 predicate places. [2021-03-24 22:22:03,176 INFO L480 AbstractCegarLoop]: Abstraction has has 32 places, 32 transitions, 165 flow [2021-03-24 22:22:03,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:22:03,176 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:22:03,176 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:22:03,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-24 22:22:03,177 INFO L428 AbstractCegarLoop]: === Iteration 4 === [Process0Err0ASSERT_VIOLATIONASSERT, Process1Err0ASSERT_VIOLATIONASSERT, Process1Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr1INUSE_VIOLATION, Process0Err0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-03-24 22:22:03,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:22:03,177 INFO L82 PathProgramCache]: Analyzing trace with hash 705983668, now seen corresponding path program 3 times [2021-03-24 22:22:03,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:22:03,178 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992131062] [2021-03-24 22:22:03,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:22:03,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:22:03,186 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:22:03,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:22:03,190 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:22:03,202 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:22:03,202 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:22:03,203 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-24 22:22:03,215 INFO L202 PluginConnector]: Adding new model PetersonWithBug.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.03 10:22:03 BasicIcfg [2021-03-24 22:22:03,216 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-24 22:22:03,217 INFO L168 Benchmark]: Toolchain (without parser) took 1022.93 ms. Allocated memory was 255.9 MB in the beginning and 362.8 MB in the end (delta: 107.0 MB). Free memory was 236.6 MB in the beginning and 338.6 MB in the end (delta: -102.0 MB). Peak memory consumption was 5.9 MB. Max. memory is 16.0 GB. [2021-03-24 22:22:03,217 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.11 ms. Allocated memory is still 255.9 MB. Free memory is still 237.7 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 22:22:03,218 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.30 ms. Allocated memory is still 255.9 MB. Free memory was 236.5 MB in the beginning and 235.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-24 22:22:03,218 INFO L168 Benchmark]: Boogie Preprocessor took 11.78 ms. Allocated memory is still 255.9 MB. Free memory was 235.2 MB in the beginning and 234.2 MB in the end (delta: 955.3 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 22:22:03,219 INFO L168 Benchmark]: RCFGBuilder took 196.73 ms. Allocated memory is still 255.9 MB. Free memory was 234.1 MB in the beginning and 239.0 MB in the end (delta: -4.9 MB). Peak memory consumption was 19.6 MB. Max. memory is 16.0 GB. [2021-03-24 22:22:03,219 INFO L168 Benchmark]: TraceAbstraction took 787.06 ms. Allocated memory was 255.9 MB in the beginning and 362.8 MB in the end (delta: 107.0 MB). Free memory was 239.0 MB in the beginning and 338.6 MB in the end (delta: -99.6 MB). Peak memory consumption was 7.2 MB. Max. memory is 16.0 GB. [2021-03-24 22:22:03,222 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.11 ms. Allocated memory is still 255.9 MB. Free memory is still 237.7 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 23.30 ms. Allocated memory is still 255.9 MB. Free memory was 236.5 MB in the beginning and 235.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 11.78 ms. Allocated memory is still 255.9 MB. Free memory was 235.2 MB in the beginning and 234.2 MB in the end (delta: 955.3 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 196.73 ms. Allocated memory is still 255.9 MB. Free memory was 234.1 MB in the beginning and 239.0 MB in the end (delta: -4.9 MB). Peak memory consumption was 19.6 MB. Max. memory is 16.0 GB. * TraceAbstraction took 787.06 ms. Allocated memory was 255.9 MB in the beginning and 362.8 MB in the end (delta: 107.0 MB). Free memory was 239.0 MB in the beginning and 338.6 MB in the end (delta: -99.6 MB). Peak memory consumption was 7.2 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 157.0ms, 29 PlacesBefore, 25 PlacesAfterwards, 24 TransitionsBefore, 20 TransitionsAfterwards, 260 CoEnabledTransitionPairs, 2 FixpointIterations, 0 TrivialSequentialCompositions, 4 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 4 TotalNumberOfCompositions, 107 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 63, positive: 57, positive conditional: 0, positive unconditional: 57, negative: 6, negative conditional: 0, negative unconditional: 6, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 61, positive: 55, positive conditional: 0, positive unconditional: 55, negative: 6, negative conditional: 0, negative unconditional: 6, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 61, positive: 55, positive conditional: 0, positive unconditional: 55, negative: 6, negative conditional: 0, negative unconditional: 6, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.Independence Queries: [ total: 61, positive: 50, positive conditional: 0, positive unconditional: 50, negative: 11, negative conditional: 0, negative unconditional: 11, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 11, positive: 5, positive conditional: 0, positive unconditional: 5, negative: 6, negative conditional: 0, negative unconditional: 6, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 53, positive: 24, positive conditional: 0, positive unconditional: 24, negative: 29, negative conditional: 0, negative unconditional: 29, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 63, positive: 2, positive conditional: 0, positive unconditional: 2, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 61, unknown conditional: 0, unknown unconditional: 61] , Statistics on independence cache: Total cache size (in pairs): 15, Positive cache size: 11, Positive conditional cache size: 0, Positive unconditional cache size: 11, Negative cache size: 4, Negative conditional cache size: 0, Negative unconditional cache size: 4 - CounterExampleResult [Line: 59]: assertion can be violated assertion can be violated We found a FailurePath: [L25] 0 critical := 0; VAL [critical=0] [L26] FORK 0 fork 0 Process0(); VAL [critical=0] [L37] 1 turn := 1; VAL [critical=0, turn=1] [L27] FORK 0 fork 1 Process1(); VAL [critical=0, turn=1] [L56] 2 flag1 := 1; VAL [critical=0, flag1=1, turn=1] [L57] 2 turn := 0; VAL [critical=0, flag1=1, turn=0] [L58] 2 assume flag0 == 0 || turn == 1; VAL [critical=0, flag0=0, flag1=1, turn=0] [L38] 1 flag0 := 1; VAL [critical=0, flag0=1, flag1=1, turn=0] [L39] 1 assume flag1 == 0 || turn == 0; VAL [critical=0, flag0=1, flag1=1, turn=0] [L40] 1 assert critical == 0; VAL [critical=0, flag0=1, flag1=1, turn=0] [L41] 1 critical := 1; VAL [critical=1, flag0=1, flag1=1, turn=0] [L59] 2 assert critical == 0; VAL [critical=1, flag0=1, flag1=1, turn=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 25 locations, 2 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 3.8ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 696.0ms, OverallIterations: 4, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 183.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 222.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 26 SDtfs, 8 SDslu, 3 SDs, 0 SdLazy, 24 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 35.5ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 40.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=165occurred in iteration=3, InterpolantAutomatonStates: 11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 12.9ms SsaConstructionTime, 29.8ms SatisfiabilityAnalysisTime, 110.3ms InterpolantComputationTime, 42 NumberOfCodeBlocks, 42 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 27 ConstructedInterpolants, 0 QuantifiedInterpolants, 69 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...