/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-VariableLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-24 13:16:00,587 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-24 13:16:00,590 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-24 13:16:00,621 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-24 13:16:00,621 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-24 13:16:00,623 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-24 13:16:00,625 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-24 13:16:00,630 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-24 13:16:00,632 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-24 13:16:00,635 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-24 13:16:00,636 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-24 13:16:00,637 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-03-24 13:16:00,637 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-24 13:16:00,639 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-24 13:16:00,640 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-24 13:16:00,642 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-24 13:16:00,644 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-24 13:16:00,645 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-24 13:16:00,646 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-24 13:16:00,652 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-24 13:16:00,653 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-24 13:16:00,654 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-24 13:16:00,654 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-24 13:16:00,656 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-24 13:16:00,660 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-03-24 13:16:00,661 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-03-24 13:16:00,661 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-03-24 13:16:00,662 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-03-24 13:16:00,662 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-03-24 13:16:00,663 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-03-24 13:16:00,663 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-03-24 13:16:00,664 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-03-24 13:16:00,665 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-03-24 13:16:00,665 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-03-24 13:16:00,666 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-03-24 13:16:00,666 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-03-24 13:16:00,666 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-03-24 13:16:00,666 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-03-24 13:16:00,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-24 13:16:00,667 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-24 13:16:00,667 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-24 13:16:00,668 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-VariableLbe.epf [2021-03-24 13:16:00,698 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-24 13:16:00,698 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-24 13:16:00,701 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-24 13:16:00,701 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-24 13:16:00,702 INFO L138 SettingsManager]: * Use SBE=true [2021-03-24 13:16:00,702 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-24 13:16:00,702 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-24 13:16:00,702 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-24 13:16:00,702 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-24 13:16:00,702 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-24 13:16:00,703 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-24 13:16:00,703 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-24 13:16:00,703 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-24 13:16:00,703 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-24 13:16:00,703 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-24 13:16:00,703 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-24 13:16:00,703 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-24 13:16:00,703 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 13:16:00,704 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-24 13:16:00,704 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=VARIABLE_BASED_MOVER_CHECK [2021-03-24 13:16:00,705 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-24 13:16:00,705 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-24 13:16:00,978 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-24 13:16:00,993 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-24 13:16:00,995 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-24 13:16:00,996 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-24 13:16:00,996 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-24 13:16:00,997 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl [2021-03-24 13:16:00,997 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_inc.bpl' [2021-03-24 13:16:01,022 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-24 13:16:01,023 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-24 13:16:01,024 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-24 13:16:01,024 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-24 13:16:01,024 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-24 13:16:01,033 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 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,038 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 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,044 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-24 13:16:01,046 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-24 13:16:01,046 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-24 13:16:01,046 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-24 13:16:01,052 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,053 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,054 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,054 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,056 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,058 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,058 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (1/1) ... [2021-03-24 13:16:01,060 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-24 13:16:01,060 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-24 13:16:01,060 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-24 13:16:01,060 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-24 13:16:01,061 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (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 13:16:01,129 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-24 13:16:01,129 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-24 13:16:01,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-24 13:16:01,130 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-03-24 13:16:01,130 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-03-24 13:16:01,130 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-03-24 13:16:01,130 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 13:16:01,216 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-24 13:16:01,216 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-24 13:16:01,217 INFO L202 PluginConnector]: Adding new model fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:16:01 BoogieIcfgContainer [2021-03-24 13:16:01,218 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-24 13:16:01,219 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-24 13:16:01,219 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-24 13:16:01,221 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-24 13:16:01,221 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:16:01" (1/2) ... [2021-03-24 13:16:01,222 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4b8ec574 and model type fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.03 01:16:01, skipping insertion in model container [2021-03-24 13:16:01,222 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_inc.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:16:01" (2/2) ... [2021-03-24 13:16:01,223 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_inc.bpl [2021-03-24 13:16:01,227 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-24 13:16:01,230 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-24 13:16:01,231 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-24 13:16:01,246 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:01,259 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:01,274 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:01,274 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:01,274 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:01,274 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:01,274 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:01,275 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:01,275 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:01,275 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:01,281 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 8 transitions, 21 flow [2021-03-24 13:16:01,293 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 13:16:01,293 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,295 INFO L84 FinitePrefix]: Finished finitePrefix Result has 16 conditions, 11 events. 0/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 19 event pairs, 0 based on Foata normal form. 0/9 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:16:01,295 INFO L82 GeneralOperation]: Start removeDead. Operand has 11 places, 8 transitions, 21 flow [2021-03-24 13:16:01,298 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 9 places, 6 transitions, 17 flow [2021-03-24 13:16:01,299 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:01,306 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-24 13:16:01,309 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 9 places, 6 transitions, 17 flow [2021-03-24 13:16:01,309 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 9 places, 6 transitions, 17 flow [2021-03-24 13:16:01,311 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 13:16:01,311 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,312 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12 conditions, 7 events. 0/7 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 8 event pairs, 0 based on Foata normal form. 0/7 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:16:01,313 INFO L142 LiptonReduction]: Number of co-enabled transitions 8 [2021-03-24 13:16:01,331 INFO L154 LiptonReduction]: Checked pairs total: 4 [2021-03-24 13:16:01,332 INFO L156 LiptonReduction]: Total number of compositions: 1 [2021-03-24 13:16:01,333 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 35 [2021-03-24 13:16:01,338 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 13:16:01,338 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,338 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,338 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:01,339 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1315, now seen corresponding path program 1 times [2021-03-24 13:16:01,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,360 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450163314] [2021-03-24 13:16:01,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:01,425 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:01,425 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:01,431 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 13:16:01,431 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450163314] [2021-03-24 13:16:01,432 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:01,432 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:01,432 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188777141] [2021-03-24 13:16:01,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:01,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:01,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:01,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:01,447 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 4 out of 9 [2021-03-24 13:16:01,448 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 8 places, 5 transitions, 15 flow. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,448 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:01,448 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 4 of 9 [2021-03-24 13:16:01,449 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:01,456 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-24 13:16:01,456 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,456 INFO L84 FinitePrefix]: Finished finitePrefix Result has 12 conditions, 4 events. 0/4 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 3/7 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:16:01,457 INFO L132 encePairwiseOnDemand]: 7/9 looper letters, 1 selfloop transitions, 1 changer transitions 0/4 dead transitions. [2021-03-24 13:16:01,457 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 9 places, 4 transitions, 17 flow [2021-03-24 13:16:01,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:01,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:01,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 15 transitions. [2021-03-24 13:16:01,464 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5555555555555556 [2021-03-24 13:16:01,465 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 15 transitions. [2021-03-24 13:16:01,465 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 15 transitions. [2021-03-24 13:16:01,465 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:01,467 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 15 transitions. [2021-03-24 13:16:01,468 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,470 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,470 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,471 INFO L185 Difference]: Start difference. First operand has 8 places, 5 transitions, 15 flow. Second operand 3 states and 15 transitions. [2021-03-24 13:16:01,472 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 9 places, 4 transitions, 17 flow [2021-03-24 13:16:01,473 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 9 places, 4 transitions, 17 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:01,474 INFO L241 Difference]: Finished difference. Result has 9 places, 4 transitions, 15 flow [2021-03-24 13:16:01,475 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=9, PETRI_DIFFERENCE_MINUEND_FLOW=13, PETRI_DIFFERENCE_MINUEND_PLACES=7, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=4, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=3, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=15, PETRI_PLACES=9, PETRI_TRANSITIONS=4} [2021-03-24 13:16:01,475 INFO L343 CegarLoopForPetriNet]: 8 programPoint places, 1 predicate places. [2021-03-24 13:16:01,475 INFO L480 AbstractCegarLoop]: Abstraction has has 9 places, 4 transitions, 15 flow [2021-03-24 13:16:01,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,476 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,476 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-24 13:16:01,476 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-24 13:16:01,476 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,476 INFO L82 PathProgramCache]: Analyzing trace with hash 41033, now seen corresponding path program 1 times [2021-03-24 13:16:01,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,477 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293352285] [2021-03-24 13:16:01,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,479 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,481 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,489 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:01,489 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:01,490 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-24 13:16:01,490 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:01,491 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-24 13:16:01,495 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:01,495 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:01,497 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:01,497 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:01,497 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:01,497 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:01,497 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:01,497 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:01,497 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:01,497 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:01,498 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 16 places, 11 transitions, 34 flow [2021-03-24 13:16:01,501 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-24 13:16:01,501 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,501 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 17 events. 0/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 38 event pairs, 0 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-24 13:16:01,501 INFO L82 GeneralOperation]: Start removeDead. Operand has 16 places, 11 transitions, 34 flow [2021-03-24 13:16:01,502 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 9 transitions, 30 flow [2021-03-24 13:16:01,502 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:01,502 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-24 13:16:01,502 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 14 places, 9 transitions, 30 flow [2021-03-24 13:16:01,502 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 14 places, 9 transitions, 30 flow [2021-03-24 13:16:01,505 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 13:16:01,505 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,505 INFO L84 FinitePrefix]: Finished finitePrefix Result has 21 conditions, 11 events. 0/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 11 event pairs, 0 based on Foata normal form. 0/11 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-24 13:16:01,505 INFO L142 LiptonReduction]: Number of co-enabled transitions 28 [2021-03-24 13:16:01,533 INFO L154 LiptonReduction]: Checked pairs total: 18 [2021-03-24 13:16:01,533 INFO L156 LiptonReduction]: Total number of compositions: 2 [2021-03-24 13:16:01,534 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 32 [2021-03-24 13:16:01,535 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:16:01,535 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,535 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,535 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:01,535 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1699, now seen corresponding path program 1 times [2021-03-24 13:16:01,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,536 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451713945] [2021-03-24 13:16:01,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:01,541 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:01,542 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:01,545 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 13:16:01,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451713945] [2021-03-24 13:16:01,545 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:01,546 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:01,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340232561] [2021-03-24 13:16:01,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:01,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:01,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:01,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:01,547 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 13 [2021-03-24 13:16:01,547 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 12 places, 7 transitions, 26 flow. Second operand has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,547 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:01,547 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 13 [2021-03-24 13:16:01,547 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:01,554 INFO L129 PetriNetUnfolder]: 1/8 cut-off events. [2021-03-24 13:16:01,554 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,555 INFO L84 FinitePrefix]: Finished finitePrefix Result has 24 conditions, 8 events. 1/8 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 6 event pairs, 1 based on Foata normal form. 6/13 useless extension candidates. Maximal degree in co-relation 9. Up to 5 conditions per place. [2021-03-24 13:16:01,555 INFO L132 encePairwiseOnDemand]: 11/13 looper letters, 2 selfloop transitions, 1 changer transitions 0/6 dead transitions. [2021-03-24 13:16:01,555 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 13 places, 6 transitions, 30 flow [2021-03-24 13:16:01,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:01,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:01,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 22 transitions. [2021-03-24 13:16:01,556 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5641025641025641 [2021-03-24 13:16:01,556 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 22 transitions. [2021-03-24 13:16:01,556 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 22 transitions. [2021-03-24 13:16:01,557 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:01,557 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 22 transitions. [2021-03-24 13:16:01,557 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,557 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,557 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 13.0) internal successors, (52), 4 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,558 INFO L185 Difference]: Start difference. First operand has 12 places, 7 transitions, 26 flow. Second operand 3 states and 22 transitions. [2021-03-24 13:16:01,558 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 13 places, 6 transitions, 30 flow [2021-03-24 13:16:01,558 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 13 places, 6 transitions, 28 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:01,558 INFO L241 Difference]: Finished difference. Result has 13 places, 6 transitions, 24 flow [2021-03-24 13:16:01,559 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=13, PETRI_DIFFERENCE_MINUEND_FLOW=22, PETRI_DIFFERENCE_MINUEND_PLACES=11, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=6, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=5, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=24, PETRI_PLACES=13, PETRI_TRANSITIONS=6} [2021-03-24 13:16:01,559 INFO L343 CegarLoopForPetriNet]: 12 programPoint places, 1 predicate places. [2021-03-24 13:16:01,559 INFO L480 AbstractCegarLoop]: Abstraction has has 13 places, 6 transitions, 24 flow [2021-03-24 13:16:01,559 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,559 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,559 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:16:01,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-24 13:16:01,559 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,560 INFO L82 PathProgramCache]: Analyzing trace with hash 1643499, now seen corresponding path program 1 times [2021-03-24 13:16:01,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,560 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743417066] [2021-03-24 13:16:01,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,563 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,564 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,565 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:01,565 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:01,566 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-24 13:16:01,566 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:01,567 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-24 13:16:01,572 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:01,573 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:01,573 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:01,574 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:01,574 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:01,574 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:01,574 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:01,574 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:01,574 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:01,574 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:01,575 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 14 transitions, 49 flow [2021-03-24 13:16:01,578 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-24 13:16:01,578 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,578 INFO L84 FinitePrefix]: Finished finitePrefix Result has 39 conditions, 23 events. 0/23 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 65 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-24 13:16:01,579 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 14 transitions, 49 flow [2021-03-24 13:16:01,579 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 19 places, 12 transitions, 45 flow [2021-03-24 13:16:01,579 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:01,579 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-24 13:16:01,579 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 19 places, 12 transitions, 45 flow [2021-03-24 13:16:01,580 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 19 places, 12 transitions, 45 flow [2021-03-24 13:16:01,582 INFO L129 PetriNetUnfolder]: 0/15 cut-off events. [2021-03-24 13:16:01,582 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,582 INFO L84 FinitePrefix]: Finished finitePrefix Result has 31 conditions, 15 events. 0/15 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 23 event pairs, 0 based on Foata normal form. 0/15 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-24 13:16:01,583 INFO L142 LiptonReduction]: Number of co-enabled transitions 60 [2021-03-24 13:16:01,605 INFO L154 LiptonReduction]: Checked pairs total: 42 [2021-03-24 13:16:01,606 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-24 13:16:01,606 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 27 [2021-03-24 13:16:01,607 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:16:01,607 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,607 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,607 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:01,608 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,608 INFO L82 PathProgramCache]: Analyzing trace with hash 2211, now seen corresponding path program 1 times [2021-03-24 13:16:01,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,608 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734415679] [2021-03-24 13:16:01,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:01,613 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:01,613 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:01,616 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 13:16:01,616 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734415679] [2021-03-24 13:16:01,616 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:01,617 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:01,617 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123577383] [2021-03-24 13:16:01,617 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:01,617 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:01,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:01,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:01,618 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 17 [2021-03-24 13:16:01,618 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 16 places, 9 transitions, 39 flow. Second operand has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,618 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:01,618 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 17 [2021-03-24 13:16:01,619 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:01,629 INFO L129 PetriNetUnfolder]: 5/17 cut-off events. [2021-03-24 13:16:01,629 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,629 INFO L84 FinitePrefix]: Finished finitePrefix Result has 47 conditions, 17 events. 5/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 30 event pairs, 5 based on Foata normal form. 11/25 useless extension candidates. Maximal degree in co-relation 24. Up to 13 conditions per place. [2021-03-24 13:16:01,629 INFO L132 encePairwiseOnDemand]: 15/17 looper letters, 3 selfloop transitions, 1 changer transitions 0/8 dead transitions. [2021-03-24 13:16:01,630 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 8 transitions, 45 flow [2021-03-24 13:16:01,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:01,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:01,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 29 transitions. [2021-03-24 13:16:01,631 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5686274509803921 [2021-03-24 13:16:01,631 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 29 transitions. [2021-03-24 13:16:01,631 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 29 transitions. [2021-03-24 13:16:01,631 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:01,631 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 29 transitions. [2021-03-24 13:16:01,631 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,632 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,632 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 17.0) internal successors, (68), 4 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,632 INFO L185 Difference]: Start difference. First operand has 16 places, 9 transitions, 39 flow. Second operand 3 states and 29 transitions. [2021-03-24 13:16:01,632 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 8 transitions, 45 flow [2021-03-24 13:16:01,633 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 17 places, 8 transitions, 39 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:01,633 INFO L241 Difference]: Finished difference. Result has 17 places, 8 transitions, 33 flow [2021-03-24 13:16:01,633 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=17, PETRI_DIFFERENCE_MINUEND_FLOW=31, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=33, PETRI_PLACES=17, PETRI_TRANSITIONS=8} [2021-03-24 13:16:01,634 INFO L343 CegarLoopForPetriNet]: 16 programPoint places, 1 predicate places. [2021-03-24 13:16:01,634 INFO L480 AbstractCegarLoop]: Abstraction has has 17 places, 8 transitions, 33 flow [2021-03-24 13:16:01,634 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 8.666666666666666) internal successors, (26), 3 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,634 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,634 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-03-24 13:16:01,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-24 13:16:01,634 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,635 INFO L82 PathProgramCache]: Analyzing trace with hash 66279044, now seen corresponding path program 1 times [2021-03-24 13:16:01,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,635 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527485723] [2021-03-24 13:16:01,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,638 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,640 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,641 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:01,641 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:01,641 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-24 13:16:01,641 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:01,642 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-24 13:16:01,648 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:01,648 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:01,649 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:01,649 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:01,649 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:01,649 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:01,650 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:01,650 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:01,650 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:01,650 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:01,650 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 26 places, 17 transitions, 66 flow [2021-03-24 13:16:01,654 INFO L129 PetriNetUnfolder]: 0/29 cut-off events. [2021-03-24 13:16:01,655 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,655 INFO L84 FinitePrefix]: Finished finitePrefix Result has 52 conditions, 29 events. 0/29 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 91 event pairs, 0 based on Foata normal form. 0/24 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-24 13:16:01,655 INFO L82 GeneralOperation]: Start removeDead. Operand has 26 places, 17 transitions, 66 flow [2021-03-24 13:16:01,655 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 24 places, 15 transitions, 62 flow [2021-03-24 13:16:01,655 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:01,656 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-24 13:16:01,656 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 24 places, 15 transitions, 62 flow [2021-03-24 13:16:01,656 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 24 places, 15 transitions, 62 flow [2021-03-24 13:16:01,659 INFO L129 PetriNetUnfolder]: 0/19 cut-off events. [2021-03-24 13:16:01,659 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,659 INFO L84 FinitePrefix]: Finished finitePrefix Result has 42 conditions, 19 events. 0/19 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 29 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-24 13:16:01,660 INFO L142 LiptonReduction]: Number of co-enabled transitions 104 [2021-03-24 13:16:01,685 INFO L154 LiptonReduction]: Checked pairs total: 76 [2021-03-24 13:16:01,686 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 13:16:01,686 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 31 [2021-03-24 13:16:01,687 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:16:01,687 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,687 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,687 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:01,687 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,688 INFO L82 PathProgramCache]: Analyzing trace with hash 2851, now seen corresponding path program 1 times [2021-03-24 13:16:01,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,688 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373908170] [2021-03-24 13:16:01,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:01,692 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:01,693 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:01,695 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 13:16:01,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373908170] [2021-03-24 13:16:01,696 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:01,696 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:01,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290410464] [2021-03-24 13:16:01,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:01,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:01,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:01,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:01,697 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 21 [2021-03-24 13:16:01,697 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 20 places, 11 transitions, 54 flow. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,697 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:01,697 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 21 [2021-03-24 13:16:01,697 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:01,710 INFO L129 PetriNetUnfolder]: 17/38 cut-off events. [2021-03-24 13:16:01,711 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,711 INFO L84 FinitePrefix]: Finished finitePrefix Result has 95 conditions, 38 events. 17/38 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 111 event pairs, 17 based on Foata normal form. 20/52 useless extension candidates. Maximal degree in co-relation 64. Up to 33 conditions per place. [2021-03-24 13:16:01,712 INFO L132 encePairwiseOnDemand]: 19/21 looper letters, 4 selfloop transitions, 1 changer transitions 0/10 dead transitions. [2021-03-24 13:16:01,712 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 21 places, 10 transitions, 62 flow [2021-03-24 13:16:01,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:01,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:01,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 36 transitions. [2021-03-24 13:16:01,713 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5714285714285714 [2021-03-24 13:16:01,713 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 36 transitions. [2021-03-24 13:16:01,713 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 36 transitions. [2021-03-24 13:16:01,714 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:01,714 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 36 transitions. [2021-03-24 13:16:01,714 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 12.0) internal successors, (36), 3 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,714 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,715 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 21.0) internal successors, (84), 4 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,715 INFO L185 Difference]: Start difference. First operand has 20 places, 11 transitions, 54 flow. Second operand 3 states and 36 transitions. [2021-03-24 13:16:01,715 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 21 places, 10 transitions, 62 flow [2021-03-24 13:16:01,715 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 10 transitions, 50 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:01,716 INFO L241 Difference]: Finished difference. Result has 21 places, 10 transitions, 42 flow [2021-03-24 13:16:01,716 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=21, PETRI_DIFFERENCE_MINUEND_FLOW=40, PETRI_DIFFERENCE_MINUEND_PLACES=19, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=10, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=42, PETRI_PLACES=21, PETRI_TRANSITIONS=10} [2021-03-24 13:16:01,716 INFO L343 CegarLoopForPetriNet]: 20 programPoint places, 1 predicate places. [2021-03-24 13:16:01,716 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 10 transitions, 42 flow [2021-03-24 13:16:01,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,716 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,716 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-24 13:16:01,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-24 13:16:01,717 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1646739026, now seen corresponding path program 1 times [2021-03-24 13:16:01,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,717 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708998519] [2021-03-24 13:16:01,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,720 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,722 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,723 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:01,723 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:01,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-24 13:16:01,724 WARN L342 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:01,724 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-03-24 13:16:01,731 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:01,731 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:01,732 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:01,732 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:01,732 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:01,732 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:01,732 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:01,732 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:01,732 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:01,732 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:01,733 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 31 places, 20 transitions, 85 flow [2021-03-24 13:16:01,737 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-24 13:16:01,737 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,738 INFO L84 FinitePrefix]: Finished finitePrefix Result has 66 conditions, 35 events. 0/35 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 111 event pairs, 0 based on Foata normal form. 0/29 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-24 13:16:01,738 INFO L82 GeneralOperation]: Start removeDead. Operand has 31 places, 20 transitions, 85 flow [2021-03-24 13:16:01,738 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 29 places, 18 transitions, 81 flow [2021-03-24 13:16:01,738 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:01,738 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-24 13:16:01,739 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 29 places, 18 transitions, 81 flow [2021-03-24 13:16:01,739 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 29 places, 18 transitions, 81 flow [2021-03-24 13:16:01,742 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-24 13:16:01,742 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,742 INFO L84 FinitePrefix]: Finished finitePrefix Result has 54 conditions, 23 events. 0/23 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 54 event pairs, 0 based on Foata normal form. 0/23 useless extension candidates. Maximal degree in co-relation 0. Up to 6 conditions per place. [2021-03-24 13:16:01,742 INFO L142 LiptonReduction]: Number of co-enabled transitions 160 [2021-03-24 13:16:01,772 INFO L154 LiptonReduction]: Checked pairs total: 120 [2021-03-24 13:16:01,773 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-24 13:16:01,773 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 35 [2021-03-24 13:16:01,774 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 13:16:01,774 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,774 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,774 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:01,774 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,775 INFO L82 PathProgramCache]: Analyzing trace with hash 3619, now seen corresponding path program 1 times [2021-03-24 13:16:01,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,775 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879812069] [2021-03-24 13:16:01,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:01,779 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:01,779 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:01,782 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 13:16:01,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879812069] [2021-03-24 13:16:01,782 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:01,782 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:01,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108382865] [2021-03-24 13:16:01,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:01,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:01,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:01,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:01,783 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-03-24 13:16:01,783 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 24 places, 13 transitions, 71 flow. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,784 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:01,784 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-03-24 13:16:01,784 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:01,803 INFO L129 PetriNetUnfolder]: 49/87 cut-off events. [2021-03-24 13:16:01,804 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,805 INFO L84 FinitePrefix]: Finished finitePrefix Result has 200 conditions, 87 events. 49/87 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 17. Compared 316 event pairs, 49 based on Foata normal form. 37/111 useless extension candidates. Maximal degree in co-relation 160. Up to 81 conditions per place. [2021-03-24 13:16:01,806 INFO L132 encePairwiseOnDemand]: 23/25 looper letters, 5 selfloop transitions, 1 changer transitions 0/12 dead transitions. [2021-03-24 13:16:01,806 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 25 places, 12 transitions, 81 flow [2021-03-24 13:16:01,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:01,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:01,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 43 transitions. [2021-03-24 13:16:01,807 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5733333333333334 [2021-03-24 13:16:01,807 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 43 transitions. [2021-03-24 13:16:01,807 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 43 transitions. [2021-03-24 13:16:01,807 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:01,807 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 43 transitions. [2021-03-24 13:16:01,808 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 14.333333333333334) internal successors, (43), 3 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,808 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,808 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,809 INFO L185 Difference]: Start difference. First operand has 24 places, 13 transitions, 71 flow. Second operand 3 states and 43 transitions. [2021-03-24 13:16:01,809 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 25 places, 12 transitions, 81 flow [2021-03-24 13:16:01,810 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 25 places, 12 transitions, 61 flow, removed 10 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:01,810 INFO L241 Difference]: Finished difference. Result has 25 places, 12 transitions, 51 flow [2021-03-24 13:16:01,810 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=25, PETRI_DIFFERENCE_MINUEND_FLOW=49, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=51, PETRI_PLACES=25, PETRI_TRANSITIONS=12} [2021-03-24 13:16:01,810 INFO L343 CegarLoopForPetriNet]: 24 programPoint places, 1 predicate places. [2021-03-24 13:16:01,810 INFO L480 AbstractCegarLoop]: Abstraction has has 25 places, 12 transitions, 51 flow [2021-03-24 13:16:01,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,811 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,811 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:01,811 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-24 13:16:01,811 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,811 INFO L82 PathProgramCache]: Analyzing trace with hash 1085119695, now seen corresponding path program 1 times [2021-03-24 13:16:01,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,812 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280160243] [2021-03-24 13:16:01,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,814 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,816 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,817 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:01,817 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:01,818 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-24 13:16:01,818 WARN L342 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:01,818 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-03-24 13:16:01,826 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:01,826 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:01,827 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:01,827 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:01,827 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:01,827 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:01,827 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:01,827 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:01,827 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:01,828 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:01,828 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 36 places, 23 transitions, 106 flow [2021-03-24 13:16:01,832 INFO L129 PetriNetUnfolder]: 0/41 cut-off events. [2021-03-24 13:16:01,832 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,832 INFO L84 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 41 events. 0/41 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 136 event pairs, 0 based on Foata normal form. 0/34 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-24 13:16:01,832 INFO L82 GeneralOperation]: Start removeDead. Operand has 36 places, 23 transitions, 106 flow [2021-03-24 13:16:01,833 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 21 transitions, 102 flow [2021-03-24 13:16:01,833 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:01,833 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-24 13:16:01,833 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 21 transitions, 102 flow [2021-03-24 13:16:01,834 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 21 transitions, 102 flow [2021-03-24 13:16:01,836 INFO L129 PetriNetUnfolder]: 0/27 cut-off events. [2021-03-24 13:16:01,836 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,836 INFO L84 FinitePrefix]: Finished finitePrefix Result has 67 conditions, 27 events. 0/27 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 59 event pairs, 0 based on Foata normal form. 0/27 useless extension candidates. Maximal degree in co-relation 0. Up to 7 conditions per place. [2021-03-24 13:16:01,837 INFO L142 LiptonReduction]: Number of co-enabled transitions 228 [2021-03-24 13:16:01,872 INFO L154 LiptonReduction]: Checked pairs total: 174 [2021-03-24 13:16:01,872 INFO L156 LiptonReduction]: Total number of compositions: 6 [2021-03-24 13:16:01,872 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 39 [2021-03-24 13:16:01,873 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:16:01,873 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,873 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,873 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:01,873 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,874 INFO L82 PathProgramCache]: Analyzing trace with hash 4515, now seen corresponding path program 1 times [2021-03-24 13:16:01,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,874 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027053558] [2021-03-24 13:16:01,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:01,881 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:01,882 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:01,885 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 13:16:01,885 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027053558] [2021-03-24 13:16:01,885 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:01,885 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:01,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155275440] [2021-03-24 13:16:01,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:01,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:01,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:01,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:01,888 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 29 [2021-03-24 13:16:01,889 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 28 places, 15 transitions, 90 flow. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,889 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:01,889 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 29 [2021-03-24 13:16:01,889 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:01,931 INFO L129 PetriNetUnfolder]: 129/200 cut-off events. [2021-03-24 13:16:01,936 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:01,938 INFO L84 FinitePrefix]: Finished finitePrefix Result has 434 conditions, 200 events. 129/200 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 32. Compared 780 event pairs, 129 based on Foata normal form. 70/246 useless extension candidates. Maximal degree in co-relation 384. Up to 193 conditions per place. [2021-03-24 13:16:01,941 INFO L132 encePairwiseOnDemand]: 27/29 looper letters, 6 selfloop transitions, 1 changer transitions 0/14 dead transitions. [2021-03-24 13:16:01,941 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 14 transitions, 102 flow [2021-03-24 13:16:01,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:01,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:01,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 50 transitions. [2021-03-24 13:16:01,943 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5747126436781609 [2021-03-24 13:16:01,943 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 50 transitions. [2021-03-24 13:16:01,943 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 50 transitions. [2021-03-24 13:16:01,943 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:01,944 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 50 transitions. [2021-03-24 13:16:01,945 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,946 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,946 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 29.0) internal successors, (116), 4 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,946 INFO L185 Difference]: Start difference. First operand has 28 places, 15 transitions, 90 flow. Second operand 3 states and 50 transitions. [2021-03-24 13:16:01,946 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 14 transitions, 102 flow [2021-03-24 13:16:01,949 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 14 transitions, 72 flow, removed 15 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:01,950 INFO L241 Difference]: Finished difference. Result has 29 places, 14 transitions, 60 flow [2021-03-24 13:16:01,950 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=58, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=14, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=13, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=60, PETRI_PLACES=29, PETRI_TRANSITIONS=14} [2021-03-24 13:16:01,950 INFO L343 CegarLoopForPetriNet]: 28 programPoint places, 1 predicate places. [2021-03-24 13:16:01,950 INFO L480 AbstractCegarLoop]: Abstraction has has 29 places, 14 transitions, 60 flow [2021-03-24 13:16:01,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:01,950 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:01,950 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:01,950 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-24 13:16:01,950 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:01,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:01,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1719135375, now seen corresponding path program 1 times [2021-03-24 13:16:01,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:01,952 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296304316] [2021-03-24 13:16:01,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:01,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,960 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:01,970 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:01,971 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:01,971 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:01,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-03-24 13:16:01,972 WARN L342 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:01,972 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-03-24 13:16:01,999 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:01,999 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:02,000 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:02,000 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:02,000 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:02,000 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:02,000 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:02,000 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:02,000 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:02,000 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:02,001 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 41 places, 26 transitions, 129 flow [2021-03-24 13:16:02,003 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-24 13:16:02,003 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,004 INFO L84 FinitePrefix]: Finished finitePrefix Result has 97 conditions, 47 events. 0/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 166 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-24 13:16:02,004 INFO L82 GeneralOperation]: Start removeDead. Operand has 41 places, 26 transitions, 129 flow [2021-03-24 13:16:02,004 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 39 places, 24 transitions, 125 flow [2021-03-24 13:16:02,004 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:02,004 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-24 13:16:02,004 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 39 places, 24 transitions, 125 flow [2021-03-24 13:16:02,005 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 39 places, 24 transitions, 125 flow [2021-03-24 13:16:02,006 INFO L129 PetriNetUnfolder]: 0/31 cut-off events. [2021-03-24 13:16:02,006 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,006 INFO L84 FinitePrefix]: Finished finitePrefix Result has 81 conditions, 31 events. 0/31 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 86 event pairs, 0 based on Foata normal form. 0/31 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-24 13:16:02,007 INFO L142 LiptonReduction]: Number of co-enabled transitions 308 [2021-03-24 13:16:02,057 INFO L154 LiptonReduction]: Checked pairs total: 238 [2021-03-24 13:16:02,057 INFO L156 LiptonReduction]: Total number of compositions: 7 [2021-03-24 13:16:02,058 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 54 [2021-03-24 13:16:02,059 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:16:02,059 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,059 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:02,059 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:02,059 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:02,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:02,060 INFO L82 PathProgramCache]: Analyzing trace with hash 5539, now seen corresponding path program 1 times [2021-03-24 13:16:02,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:02,060 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280960352] [2021-03-24 13:16:02,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:02,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:02,068 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:02,068 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:02,071 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 13:16:02,071 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280960352] [2021-03-24 13:16:02,071 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:02,071 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:02,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177816830] [2021-03-24 13:16:02,071 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:02,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:02,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:02,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:02,072 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 16 out of 33 [2021-03-24 13:16:02,072 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 32 places, 17 transitions, 111 flow. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,072 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:02,072 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 16 of 33 [2021-03-24 13:16:02,072 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:02,131 INFO L129 PetriNetUnfolder]: 321/457 cut-off events. [2021-03-24 13:16:02,132 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,134 INFO L84 FinitePrefix]: Finished finitePrefix Result has 957 conditions, 457 events. 321/457 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 61. Compared 1914 event pairs, 321 based on Foata normal form. 135/549 useless extension candidates. Maximal degree in co-relation 896. Up to 449 conditions per place. [2021-03-24 13:16:02,136 INFO L132 encePairwiseOnDemand]: 31/33 looper letters, 7 selfloop transitions, 1 changer transitions 0/16 dead transitions. [2021-03-24 13:16:02,137 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 16 transitions, 125 flow [2021-03-24 13:16:02,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:02,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:02,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 57 transitions. [2021-03-24 13:16:02,139 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5757575757575758 [2021-03-24 13:16:02,139 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 57 transitions. [2021-03-24 13:16:02,139 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 57 transitions. [2021-03-24 13:16:02,139 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:02,139 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 57 transitions. [2021-03-24 13:16:02,140 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,141 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,141 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 33.0) internal successors, (132), 4 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,142 INFO L185 Difference]: Start difference. First operand has 32 places, 17 transitions, 111 flow. Second operand 3 states and 57 transitions. [2021-03-24 13:16:02,142 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 16 transitions, 125 flow [2021-03-24 13:16:02,143 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 16 transitions, 83 flow, removed 21 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:02,144 INFO L241 Difference]: Finished difference. Result has 33 places, 16 transitions, 69 flow [2021-03-24 13:16:02,144 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=33, PETRI_DIFFERENCE_MINUEND_FLOW=67, PETRI_DIFFERENCE_MINUEND_PLACES=31, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=69, PETRI_PLACES=33, PETRI_TRANSITIONS=16} [2021-03-24 13:16:02,144 INFO L343 CegarLoopForPetriNet]: 32 programPoint places, 1 predicate places. [2021-03-24 13:16:02,144 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 16 transitions, 69 flow [2021-03-24 13:16:02,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,144 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:02,144 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:02,145 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-03-24 13:16:02,145 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:02,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:02,145 INFO L82 PathProgramCache]: Analyzing trace with hash 779611434, now seen corresponding path program 1 times [2021-03-24 13:16:02,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:02,145 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1671617213] [2021-03-24 13:16:02,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:02,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:02,154 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:02,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:02,166 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:02,169 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:02,170 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:02,170 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-03-24 13:16:02,170 WARN L342 ceAbstractionStarter]: 7 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:02,170 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 8 thread instances. [2021-03-24 13:16:02,187 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:02,187 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:02,188 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:02,188 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:02,188 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:02,188 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:02,188 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:02,188 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:02,188 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:02,188 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:02,191 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 29 transitions, 154 flow [2021-03-24 13:16:02,196 INFO L129 PetriNetUnfolder]: 0/53 cut-off events. [2021-03-24 13:16:02,196 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,196 INFO L84 FinitePrefix]: Finished finitePrefix Result has 114 conditions, 53 events. 0/53 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 191 event pairs, 0 based on Foata normal form. 0/44 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-24 13:16:02,197 INFO L82 GeneralOperation]: Start removeDead. Operand has 46 places, 29 transitions, 154 flow [2021-03-24 13:16:02,197 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 44 places, 27 transitions, 150 flow [2021-03-24 13:16:02,197 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:02,197 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-24 13:16:02,197 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 44 places, 27 transitions, 150 flow [2021-03-24 13:16:02,198 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 44 places, 27 transitions, 150 flow [2021-03-24 13:16:02,199 INFO L129 PetriNetUnfolder]: 0/35 cut-off events. [2021-03-24 13:16:02,199 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,200 INFO L84 FinitePrefix]: Finished finitePrefix Result has 96 conditions, 35 events. 0/35 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 73 event pairs, 0 based on Foata normal form. 0/35 useless extension candidates. Maximal degree in co-relation 0. Up to 9 conditions per place. [2021-03-24 13:16:02,200 INFO L142 LiptonReduction]: Number of co-enabled transitions 400 [2021-03-24 13:16:02,249 INFO L154 LiptonReduction]: Checked pairs total: 312 [2021-03-24 13:16:02,249 INFO L156 LiptonReduction]: Total number of compositions: 8 [2021-03-24 13:16:02,249 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 52 [2021-03-24 13:16:02,253 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:16:02,253 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,253 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:02,253 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:02,253 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:02,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:02,253 INFO L82 PathProgramCache]: Analyzing trace with hash 6691, now seen corresponding path program 1 times [2021-03-24 13:16:02,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:02,255 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558006904] [2021-03-24 13:16:02,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:02,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:02,263 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:02,263 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:02,266 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 13:16:02,266 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558006904] [2021-03-24 13:16:02,268 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:02,268 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:02,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926620386] [2021-03-24 13:16:02,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:02,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:02,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:02,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:02,269 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 18 out of 37 [2021-03-24 13:16:02,269 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 36 places, 19 transitions, 134 flow. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,269 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:02,269 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 18 of 37 [2021-03-24 13:16:02,270 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:02,355 INFO L129 PetriNetUnfolder]: 769/1034 cut-off events. [2021-03-24 13:16:02,355 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,358 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2121 conditions, 1034 events. 769/1034 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 119. Compared 4476 event pairs, 769 based on Foata normal form. 264/1223 useless extension candidates. Maximal degree in co-relation 2048. Up to 1025 conditions per place. [2021-03-24 13:16:02,363 INFO L132 encePairwiseOnDemand]: 35/37 looper letters, 8 selfloop transitions, 1 changer transitions 0/18 dead transitions. [2021-03-24 13:16:02,364 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 18 transitions, 150 flow [2021-03-24 13:16:02,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:02,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:02,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 64 transitions. [2021-03-24 13:16:02,366 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5765765765765766 [2021-03-24 13:16:02,367 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 64 transitions. [2021-03-24 13:16:02,367 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 64 transitions. [2021-03-24 13:16:02,367 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:02,367 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 64 transitions. [2021-03-24 13:16:02,367 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,368 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,368 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 37.0) internal successors, (148), 4 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,368 INFO L185 Difference]: Start difference. First operand has 36 places, 19 transitions, 134 flow. Second operand 3 states and 64 transitions. [2021-03-24 13:16:02,368 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 18 transitions, 150 flow [2021-03-24 13:16:02,370 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 18 transitions, 94 flow, removed 28 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:02,370 INFO L241 Difference]: Finished difference. Result has 37 places, 18 transitions, 78 flow [2021-03-24 13:16:02,371 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=37, PETRI_DIFFERENCE_MINUEND_FLOW=76, PETRI_DIFFERENCE_MINUEND_PLACES=35, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=18, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=17, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=78, PETRI_PLACES=37, PETRI_TRANSITIONS=18} [2021-03-24 13:16:02,371 INFO L343 CegarLoopForPetriNet]: 36 programPoint places, 1 predicate places. [2021-03-24 13:16:02,371 INFO L480 AbstractCegarLoop]: Abstraction has has 37 places, 18 transitions, 78 flow [2021-03-24 13:16:02,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,371 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:02,371 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:02,371 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-03-24 13:16:02,371 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:02,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:02,372 INFO L82 PathProgramCache]: Analyzing trace with hash -2053304524, now seen corresponding path program 1 times [2021-03-24 13:16:02,373 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:02,373 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685094637] [2021-03-24 13:16:02,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:02,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:02,378 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:02,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:02,383 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:02,387 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:02,388 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:02,388 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-03-24 13:16:02,388 WARN L342 ceAbstractionStarter]: 8 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:02,388 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 9 thread instances. [2021-03-24 13:16:02,404 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:02,405 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:02,406 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:02,406 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:02,406 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:02,407 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:02,407 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:02,407 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:02,407 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:02,407 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:02,408 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 51 places, 32 transitions, 181 flow [2021-03-24 13:16:02,411 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-24 13:16:02,412 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,412 INFO L84 FinitePrefix]: Finished finitePrefix Result has 132 conditions, 59 events. 0/59 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 212 event pairs, 0 based on Foata normal form. 0/49 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-24 13:16:02,412 INFO L82 GeneralOperation]: Start removeDead. Operand has 51 places, 32 transitions, 181 flow [2021-03-24 13:16:02,412 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 49 places, 30 transitions, 177 flow [2021-03-24 13:16:02,412 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:02,412 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-24 13:16:02,413 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 49 places, 30 transitions, 177 flow [2021-03-24 13:16:02,413 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 49 places, 30 transitions, 177 flow [2021-03-24 13:16:02,415 INFO L129 PetriNetUnfolder]: 0/39 cut-off events. [2021-03-24 13:16:02,416 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,416 INFO L84 FinitePrefix]: Finished finitePrefix Result has 112 conditions, 39 events. 0/39 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 100 event pairs, 0 based on Foata normal form. 0/39 useless extension candidates. Maximal degree in co-relation 0. Up to 10 conditions per place. [2021-03-24 13:16:02,417 INFO L142 LiptonReduction]: Number of co-enabled transitions 504 [2021-03-24 13:16:02,468 INFO L154 LiptonReduction]: Checked pairs total: 396 [2021-03-24 13:16:02,468 INFO L156 LiptonReduction]: Total number of compositions: 9 [2021-03-24 13:16:02,468 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 56 [2021-03-24 13:16:02,468 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 13:16:02,469 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,469 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:02,469 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:02,469 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:02,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:02,469 INFO L82 PathProgramCache]: Analyzing trace with hash 7971, now seen corresponding path program 1 times [2021-03-24 13:16:02,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:02,469 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530498023] [2021-03-24 13:16:02,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:02,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:02,476 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:02,476 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:02,478 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 13:16:02,478 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530498023] [2021-03-24 13:16:02,478 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:02,478 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:02,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518989859] [2021-03-24 13:16:02,479 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:02,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:02,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:02,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:02,479 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 41 [2021-03-24 13:16:02,479 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 40 places, 21 transitions, 159 flow. Second operand has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,479 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:02,479 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 41 [2021-03-24 13:16:02,480 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:02,669 INFO L129 PetriNetUnfolder]: 1793/2315 cut-off events. [2021-03-24 13:16:02,669 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,680 INFO L84 FinitePrefix]: Finished finitePrefix Result has 4694 conditions, 2315 events. 1793/2315 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 233. Compared 10434 event pairs, 1793 based on Foata normal form. 521/2705 useless extension candidates. Maximal degree in co-relation 4608. Up to 2305 conditions per place. [2021-03-24 13:16:02,707 INFO L132 encePairwiseOnDemand]: 39/41 looper letters, 9 selfloop transitions, 1 changer transitions 0/20 dead transitions. [2021-03-24 13:16:02,707 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 41 places, 20 transitions, 177 flow [2021-03-24 13:16:02,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:02,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:02,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 71 transitions. [2021-03-24 13:16:02,708 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5772357723577236 [2021-03-24 13:16:02,708 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 71 transitions. [2021-03-24 13:16:02,708 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 71 transitions. [2021-03-24 13:16:02,708 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:02,708 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 71 transitions. [2021-03-24 13:16:02,708 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 23.666666666666668) internal successors, (71), 3 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,708 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,709 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 41.0) internal successors, (164), 4 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,709 INFO L185 Difference]: Start difference. First operand has 40 places, 21 transitions, 159 flow. Second operand 3 states and 71 transitions. [2021-03-24 13:16:02,709 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 41 places, 20 transitions, 177 flow [2021-03-24 13:16:02,709 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 41 places, 20 transitions, 105 flow, removed 36 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:02,710 INFO L241 Difference]: Finished difference. Result has 41 places, 20 transitions, 87 flow [2021-03-24 13:16:02,710 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=41, PETRI_DIFFERENCE_MINUEND_FLOW=85, PETRI_DIFFERENCE_MINUEND_PLACES=39, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=87, PETRI_PLACES=41, PETRI_TRANSITIONS=20} [2021-03-24 13:16:02,710 INFO L343 CegarLoopForPetriNet]: 40 programPoint places, 1 predicate places. [2021-03-24 13:16:02,710 INFO L480 AbstractCegarLoop]: Abstraction has has 41 places, 20 transitions, 87 flow [2021-03-24 13:16:02,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 20.666666666666668) internal successors, (62), 3 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,710 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:02,710 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:02,710 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-03-24 13:16:02,710 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:02,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:02,711 INFO L82 PathProgramCache]: Analyzing trace with hash -607272555, now seen corresponding path program 1 times [2021-03-24 13:16:02,711 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:02,711 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804285916] [2021-03-24 13:16:02,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:02,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:02,713 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:02,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:02,715 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:02,716 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:02,716 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:02,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-03-24 13:16:02,716 WARN L342 ceAbstractionStarter]: 9 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:02,716 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 10 thread instances. [2021-03-24 13:16:02,741 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:02,741 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:02,742 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:02,742 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:02,742 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:02,742 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:02,742 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:02,742 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:02,742 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:02,742 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:02,742 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 56 places, 35 transitions, 210 flow [2021-03-24 13:16:02,757 INFO L129 PetriNetUnfolder]: 0/65 cut-off events. [2021-03-24 13:16:02,758 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,758 INFO L84 FinitePrefix]: Finished finitePrefix Result has 151 conditions, 65 events. 0/65 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 234 event pairs, 0 based on Foata normal form. 0/54 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-24 13:16:02,758 INFO L82 GeneralOperation]: Start removeDead. Operand has 56 places, 35 transitions, 210 flow [2021-03-24 13:16:02,758 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 54 places, 33 transitions, 206 flow [2021-03-24 13:16:02,758 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:02,758 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-24 13:16:02,758 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 54 places, 33 transitions, 206 flow [2021-03-24 13:16:02,759 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 54 places, 33 transitions, 206 flow [2021-03-24 13:16:02,761 INFO L129 PetriNetUnfolder]: 0/43 cut-off events. [2021-03-24 13:16:02,761 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,761 INFO L84 FinitePrefix]: Finished finitePrefix Result has 129 conditions, 43 events. 0/43 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 110 event pairs, 0 based on Foata normal form. 0/43 useless extension candidates. Maximal degree in co-relation 0. Up to 11 conditions per place. [2021-03-24 13:16:02,761 INFO L142 LiptonReduction]: Number of co-enabled transitions 620 [2021-03-24 13:16:02,829 INFO L154 LiptonReduction]: Checked pairs total: 490 [2021-03-24 13:16:02,829 INFO L156 LiptonReduction]: Total number of compositions: 10 [2021-03-24 13:16:02,829 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 71 [2021-03-24 13:16:02,830 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:16:02,830 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:02,830 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:02,830 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:02,830 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:02,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:02,830 INFO L82 PathProgramCache]: Analyzing trace with hash 9379, now seen corresponding path program 1 times [2021-03-24 13:16:02,830 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:02,830 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626107939] [2021-03-24 13:16:02,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:02,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:02,849 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:02,849 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:02,851 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 13:16:02,851 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626107939] [2021-03-24 13:16:02,851 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:02,851 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:02,851 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140771257] [2021-03-24 13:16:02,852 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:02,852 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:02,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:02,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:02,852 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 22 out of 45 [2021-03-24 13:16:02,852 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 44 places, 23 transitions, 186 flow. Second operand has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:02,852 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:02,852 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 22 of 45 [2021-03-24 13:16:02,852 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:03,296 INFO L129 PetriNetUnfolder]: 4097/5132 cut-off events. [2021-03-24 13:16:03,297 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:03,310 INFO L84 FinitePrefix]: Finished finitePrefix Result has 10340 conditions, 5132 events. 4097/5132 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 456. Compared 23250 event pairs, 4097 based on Foata normal form. 1034/5949 useless extension candidates. Maximal degree in co-relation 10240. Up to 5121 conditions per place. [2021-03-24 13:16:03,329 INFO L132 encePairwiseOnDemand]: 43/45 looper letters, 10 selfloop transitions, 1 changer transitions 0/22 dead transitions. [2021-03-24 13:16:03,329 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 45 places, 22 transitions, 206 flow [2021-03-24 13:16:03,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:03,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:03,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 78 transitions. [2021-03-24 13:16:03,330 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5777777777777777 [2021-03-24 13:16:03,330 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 78 transitions. [2021-03-24 13:16:03,330 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 78 transitions. [2021-03-24 13:16:03,330 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:03,330 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 78 transitions. [2021-03-24 13:16:03,330 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:03,331 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 45.0) internal successors, (180), 4 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:03,331 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 45.0) internal successors, (180), 4 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:03,331 INFO L185 Difference]: Start difference. First operand has 44 places, 23 transitions, 186 flow. Second operand 3 states and 78 transitions. [2021-03-24 13:16:03,331 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 45 places, 22 transitions, 206 flow [2021-03-24 13:16:03,332 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 45 places, 22 transitions, 116 flow, removed 45 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:03,333 INFO L241 Difference]: Finished difference. Result has 45 places, 22 transitions, 96 flow [2021-03-24 13:16:03,334 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=45, PETRI_DIFFERENCE_MINUEND_FLOW=94, PETRI_DIFFERENCE_MINUEND_PLACES=43, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=21, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=96, PETRI_PLACES=45, PETRI_TRANSITIONS=22} [2021-03-24 13:16:03,334 INFO L343 CegarLoopForPetriNet]: 44 programPoint places, 1 predicate places. [2021-03-24 13:16:03,334 INFO L480 AbstractCegarLoop]: Abstraction has has 45 places, 22 transitions, 96 flow [2021-03-24 13:16:03,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 22.666666666666668) internal successors, (68), 3 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:03,334 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:03,334 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:03,334 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-03-24 13:16:03,334 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:03,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:03,334 INFO L82 PathProgramCache]: Analyzing trace with hash -1208304905, now seen corresponding path program 1 times [2021-03-24 13:16:03,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:03,335 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274910054] [2021-03-24 13:16:03,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:03,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:03,338 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:03,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:03,339 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:03,340 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:03,340 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:03,340 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-03-24 13:16:03,341 WARN L342 ceAbstractionStarter]: 10 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:03,341 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 11 thread instances. [2021-03-24 13:16:03,353 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:03,353 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:03,354 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:03,354 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:03,354 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:03,354 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:03,354 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:03,354 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:03,354 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:03,354 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:03,354 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 61 places, 38 transitions, 241 flow [2021-03-24 13:16:03,357 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-24 13:16:03,357 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:03,357 INFO L84 FinitePrefix]: Finished finitePrefix Result has 171 conditions, 71 events. 0/71 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 257 event pairs, 0 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-24 13:16:03,357 INFO L82 GeneralOperation]: Start removeDead. Operand has 61 places, 38 transitions, 241 flow [2021-03-24 13:16:03,358 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 59 places, 36 transitions, 237 flow [2021-03-24 13:16:03,358 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:03,358 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-24 13:16:03,358 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 59 places, 36 transitions, 237 flow [2021-03-24 13:16:03,358 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 59 places, 36 transitions, 237 flow [2021-03-24 13:16:03,360 INFO L129 PetriNetUnfolder]: 0/47 cut-off events. [2021-03-24 13:16:03,360 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:03,360 INFO L84 FinitePrefix]: Finished finitePrefix Result has 147 conditions, 47 events. 0/47 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 142 event pairs, 0 based on Foata normal form. 0/47 useless extension candidates. Maximal degree in co-relation 0. Up to 12 conditions per place. [2021-03-24 13:16:03,361 INFO L142 LiptonReduction]: Number of co-enabled transitions 748 [2021-03-24 13:16:03,466 INFO L154 LiptonReduction]: Checked pairs total: 594 [2021-03-24 13:16:03,466 INFO L156 LiptonReduction]: Total number of compositions: 11 [2021-03-24 13:16:03,466 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 108 [2021-03-24 13:16:03,467 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 13:16:03,467 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:03,467 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:03,467 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:03,467 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:03,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:03,467 INFO L82 PathProgramCache]: Analyzing trace with hash 10915, now seen corresponding path program 1 times [2021-03-24 13:16:03,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:03,468 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1512021290] [2021-03-24 13:16:03,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:03,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:03,471 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:03,471 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:03,473 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 13:16:03,473 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1512021290] [2021-03-24 13:16:03,473 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:03,473 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:03,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939991227] [2021-03-24 13:16:03,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:03,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:03,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:03,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:03,474 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 49 [2021-03-24 13:16:03,474 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 48 places, 25 transitions, 215 flow. Second operand has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:03,474 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:03,474 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 49 [2021-03-24 13:16:03,475 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:04,082 INFO L129 PetriNetUnfolder]: 9217/11277 cut-off events. [2021-03-24 13:16:04,082 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:04,136 INFO L84 FinitePrefix]: Finished finitePrefix Result has 22643 conditions, 11277 events. 9217/11277 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 891. Compared 52532 event pairs, 9217 based on Foata normal form. 2059/12977 useless extension candidates. Maximal degree in co-relation 22528. Up to 11265 conditions per place. [2021-03-24 13:16:04,196 INFO L132 encePairwiseOnDemand]: 47/49 looper letters, 11 selfloop transitions, 1 changer transitions 0/24 dead transitions. [2021-03-24 13:16:04,196 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 49 places, 24 transitions, 237 flow [2021-03-24 13:16:04,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:04,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:04,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 85 transitions. [2021-03-24 13:16:04,368 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5782312925170068 [2021-03-24 13:16:04,368 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 85 transitions. [2021-03-24 13:16:04,368 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 85 transitions. [2021-03-24 13:16:04,368 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:04,368 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 85 transitions. [2021-03-24 13:16:04,369 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:04,369 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:04,369 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 49.0) internal successors, (196), 4 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:04,369 INFO L185 Difference]: Start difference. First operand has 48 places, 25 transitions, 215 flow. Second operand 3 states and 85 transitions. [2021-03-24 13:16:04,369 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 49 places, 24 transitions, 237 flow [2021-03-24 13:16:04,371 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 49 places, 24 transitions, 127 flow, removed 55 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:04,371 INFO L241 Difference]: Finished difference. Result has 49 places, 24 transitions, 105 flow [2021-03-24 13:16:04,371 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=49, PETRI_DIFFERENCE_MINUEND_FLOW=103, PETRI_DIFFERENCE_MINUEND_PLACES=47, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=23, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=105, PETRI_PLACES=49, PETRI_TRANSITIONS=24} [2021-03-24 13:16:04,371 INFO L343 CegarLoopForPetriNet]: 48 programPoint places, 1 predicate places. [2021-03-24 13:16:04,371 INFO L480 AbstractCegarLoop]: Abstraction has has 49 places, 24 transitions, 105 flow [2021-03-24 13:16:04,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 24.666666666666668) internal successors, (74), 3 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:04,372 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:04,372 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:04,372 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-03-24 13:16:04,372 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:04,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:04,372 INFO L82 PathProgramCache]: Analyzing trace with hash 941462544, now seen corresponding path program 1 times [2021-03-24 13:16:04,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:04,372 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852093697] [2021-03-24 13:16:04,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:04,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:04,455 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:04,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:04,456 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:04,457 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:04,457 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:04,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-03-24 13:16:04,457 WARN L342 ceAbstractionStarter]: 11 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:04,458 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 12 thread instances. [2021-03-24 13:16:04,470 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:04,470 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:04,470 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:04,470 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:04,470 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:04,470 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:04,471 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:04,471 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:04,471 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:04,471 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:04,471 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 66 places, 41 transitions, 274 flow [2021-03-24 13:16:04,476 INFO L129 PetriNetUnfolder]: 0/77 cut-off events. [2021-03-24 13:16:04,476 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:04,476 INFO L84 FinitePrefix]: Finished finitePrefix Result has 192 conditions, 77 events. 0/77 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 294 event pairs, 0 based on Foata normal form. 0/64 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-24 13:16:04,476 INFO L82 GeneralOperation]: Start removeDead. Operand has 66 places, 41 transitions, 274 flow [2021-03-24 13:16:04,476 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 64 places, 39 transitions, 270 flow [2021-03-24 13:16:04,476 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:04,476 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-24 13:16:04,476 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 64 places, 39 transitions, 270 flow [2021-03-24 13:16:04,477 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 64 places, 39 transitions, 270 flow [2021-03-24 13:16:04,479 INFO L129 PetriNetUnfolder]: 0/51 cut-off events. [2021-03-24 13:16:04,479 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:04,479 INFO L84 FinitePrefix]: Finished finitePrefix Result has 166 conditions, 51 events. 0/51 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 153 event pairs, 0 based on Foata normal form. 0/51 useless extension candidates. Maximal degree in co-relation 0. Up to 13 conditions per place. [2021-03-24 13:16:04,479 INFO L142 LiptonReduction]: Number of co-enabled transitions 888 [2021-03-24 13:16:04,535 INFO L154 LiptonReduction]: Checked pairs total: 708 [2021-03-24 13:16:04,535 INFO L156 LiptonReduction]: Total number of compositions: 12 [2021-03-24 13:16:04,535 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 59 [2021-03-24 13:16:04,536 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 13:16:04,536 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:04,536 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:04,536 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:04,536 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:04,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:04,536 INFO L82 PathProgramCache]: Analyzing trace with hash 12579, now seen corresponding path program 1 times [2021-03-24 13:16:04,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:04,536 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815249984] [2021-03-24 13:16:04,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:04,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:04,546 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:04,547 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:04,548 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 13:16:04,548 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815249984] [2021-03-24 13:16:04,548 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:04,548 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:04,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [108011180] [2021-03-24 13:16:04,549 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:04,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:04,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:04,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:04,549 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 26 out of 53 [2021-03-24 13:16:04,549 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 52 places, 27 transitions, 246 flow. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:04,550 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:04,550 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 26 of 53 [2021-03-24 13:16:04,550 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:06,395 INFO L129 PetriNetUnfolder]: 20481/24590 cut-off events. [2021-03-24 13:16:06,396 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:06,497 INFO L84 FinitePrefix]: Finished finitePrefix Result has 49283 conditions, 24590 events. 20481/24590 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 1750. Compared 115355 event pairs, 20481 based on Foata normal form. 4108/28107 useless extension candidates. Maximal degree in co-relation 49152. Up to 24577 conditions per place. [2021-03-24 13:16:06,578 INFO L132 encePairwiseOnDemand]: 51/53 looper letters, 12 selfloop transitions, 1 changer transitions 0/26 dead transitions. [2021-03-24 13:16:06,578 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 53 places, 26 transitions, 270 flow [2021-03-24 13:16:06,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:06,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:06,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 92 transitions. [2021-03-24 13:16:06,579 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5786163522012578 [2021-03-24 13:16:06,579 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 92 transitions. [2021-03-24 13:16:06,579 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 92 transitions. [2021-03-24 13:16:06,579 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:06,579 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 92 transitions. [2021-03-24 13:16:06,580 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:06,580 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 53.0) internal successors, (212), 4 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:06,580 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 53.0) internal successors, (212), 4 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:06,580 INFO L185 Difference]: Start difference. First operand has 52 places, 27 transitions, 246 flow. Second operand 3 states and 92 transitions. [2021-03-24 13:16:06,580 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 53 places, 26 transitions, 270 flow [2021-03-24 13:16:06,581 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 53 places, 26 transitions, 138 flow, removed 66 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:06,582 INFO L241 Difference]: Finished difference. Result has 53 places, 26 transitions, 114 flow [2021-03-24 13:16:06,582 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=53, PETRI_DIFFERENCE_MINUEND_FLOW=112, PETRI_DIFFERENCE_MINUEND_PLACES=51, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=26, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=25, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=114, PETRI_PLACES=53, PETRI_TRANSITIONS=26} [2021-03-24 13:16:06,582 INFO L343 CegarLoopForPetriNet]: 52 programPoint places, 1 predicate places. [2021-03-24 13:16:06,582 INFO L480 AbstractCegarLoop]: Abstraction has has 53 places, 26 transitions, 114 flow [2021-03-24 13:16:06,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:06,582 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:06,583 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:06,583 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-03-24 13:16:06,583 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:06,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:06,583 INFO L82 PathProgramCache]: Analyzing trace with hash 1127292090, now seen corresponding path program 1 times [2021-03-24 13:16:06,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:06,583 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264625003] [2021-03-24 13:16:06,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:06,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:06,587 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:06,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:06,589 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:06,590 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:06,590 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:06,590 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-03-24 13:16:06,590 WARN L342 ceAbstractionStarter]: 12 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:06,590 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 13 thread instances. [2021-03-24 13:16:06,602 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:06,602 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:06,602 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:06,602 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:06,602 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:06,602 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:06,602 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:06,602 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:06,603 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:06,603 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:06,603 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 71 places, 44 transitions, 309 flow [2021-03-24 13:16:06,606 INFO L129 PetriNetUnfolder]: 0/83 cut-off events. [2021-03-24 13:16:06,606 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:06,607 INFO L84 FinitePrefix]: Finished finitePrefix Result has 214 conditions, 83 events. 0/83 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 304 event pairs, 0 based on Foata normal form. 0/69 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-24 13:16:06,607 INFO L82 GeneralOperation]: Start removeDead. Operand has 71 places, 44 transitions, 309 flow [2021-03-24 13:16:06,607 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 69 places, 42 transitions, 305 flow [2021-03-24 13:16:06,607 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:06,607 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-24 13:16:06,607 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 69 places, 42 transitions, 305 flow [2021-03-24 13:16:06,607 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 69 places, 42 transitions, 305 flow [2021-03-24 13:16:06,609 INFO L129 PetriNetUnfolder]: 0/55 cut-off events. [2021-03-24 13:16:06,610 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:06,610 INFO L84 FinitePrefix]: Finished finitePrefix Result has 186 conditions, 55 events. 0/55 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 126 event pairs, 0 based on Foata normal form. 0/55 useless extension candidates. Maximal degree in co-relation 0. Up to 14 conditions per place. [2021-03-24 13:16:06,610 INFO L142 LiptonReduction]: Number of co-enabled transitions 1040 [2021-03-24 13:16:06,716 INFO L154 LiptonReduction]: Checked pairs total: 832 [2021-03-24 13:16:06,716 INFO L156 LiptonReduction]: Total number of compositions: 13 [2021-03-24 13:16:06,717 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 110 [2021-03-24 13:16:06,717 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:16:06,717 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:06,717 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:06,717 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:06,717 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:06,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:06,717 INFO L82 PathProgramCache]: Analyzing trace with hash 14371, now seen corresponding path program 1 times [2021-03-24 13:16:06,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:06,718 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199881452] [2021-03-24 13:16:06,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:06,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:06,724 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:06,724 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:06,726 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 13:16:06,726 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199881452] [2021-03-24 13:16:06,726 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:06,726 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:06,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472102855] [2021-03-24 13:16:06,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:06,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:06,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:06,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:06,727 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 28 out of 57 [2021-03-24 13:16:06,727 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 56 places, 29 transitions, 279 flow. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:06,727 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:06,727 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 28 of 57 [2021-03-24 13:16:06,727 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:10,813 INFO L129 PetriNetUnfolder]: 45057/53263 cut-off events. [2021-03-24 13:16:10,813 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:11,352 INFO L84 FinitePrefix]: Finished finitePrefix Result has 106644 conditions, 53263 events. 45057/53263 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3418. Compared 250977 event pairs, 45057 based on Foata normal form. 8205/60501 useless extension candidates. Maximal degree in co-relation 106496. Up to 53249 conditions per place. [2021-03-24 13:16:11,553 INFO L132 encePairwiseOnDemand]: 55/57 looper letters, 13 selfloop transitions, 1 changer transitions 0/28 dead transitions. [2021-03-24 13:16:11,554 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 57 places, 28 transitions, 305 flow [2021-03-24 13:16:11,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:11,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:11,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 99 transitions. [2021-03-24 13:16:11,555 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5789473684210527 [2021-03-24 13:16:11,555 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 99 transitions. [2021-03-24 13:16:11,555 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 99 transitions. [2021-03-24 13:16:11,555 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:11,555 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 99 transitions. [2021-03-24 13:16:11,556 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:11,557 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:11,557 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 57.0) internal successors, (228), 4 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:11,557 INFO L185 Difference]: Start difference. First operand has 56 places, 29 transitions, 279 flow. Second operand 3 states and 99 transitions. [2021-03-24 13:16:11,557 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 57 places, 28 transitions, 305 flow [2021-03-24 13:16:11,559 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 57 places, 28 transitions, 149 flow, removed 78 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:11,560 INFO L241 Difference]: Finished difference. Result has 57 places, 28 transitions, 123 flow [2021-03-24 13:16:11,560 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=57, PETRI_DIFFERENCE_MINUEND_FLOW=121, PETRI_DIFFERENCE_MINUEND_PLACES=55, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=27, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=123, PETRI_PLACES=57, PETRI_TRANSITIONS=28} [2021-03-24 13:16:11,560 INFO L343 CegarLoopForPetriNet]: 56 programPoint places, 1 predicate places. [2021-03-24 13:16:11,560 INFO L480 AbstractCegarLoop]: Abstraction has has 57 places, 28 transitions, 123 flow [2021-03-24 13:16:11,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 3 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:11,560 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:11,560 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:11,560 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-03-24 13:16:11,561 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:11,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:11,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1451810459, now seen corresponding path program 1 times [2021-03-24 13:16:11,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:11,561 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527854052] [2021-03-24 13:16:11,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:11,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:11,574 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:11,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:11,579 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:11,580 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:11,580 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:11,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-03-24 13:16:11,581 WARN L342 ceAbstractionStarter]: 13 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:11,581 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 14 thread instances. [2021-03-24 13:16:11,600 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:11,600 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:11,601 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:11,601 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:11,601 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:11,601 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:11,601 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:11,601 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:11,601 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:11,602 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:11,602 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 76 places, 47 transitions, 346 flow [2021-03-24 13:16:11,606 INFO L129 PetriNetUnfolder]: 0/89 cut-off events. [2021-03-24 13:16:11,606 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:11,606 INFO L84 FinitePrefix]: Finished finitePrefix Result has 237 conditions, 89 events. 0/89 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 346 event pairs, 0 based on Foata normal form. 0/74 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-24 13:16:11,607 INFO L82 GeneralOperation]: Start removeDead. Operand has 76 places, 47 transitions, 346 flow [2021-03-24 13:16:11,607 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 74 places, 45 transitions, 342 flow [2021-03-24 13:16:11,607 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:11,607 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-24 13:16:11,607 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 74 places, 45 transitions, 342 flow [2021-03-24 13:16:11,608 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 74 places, 45 transitions, 342 flow [2021-03-24 13:16:11,610 INFO L129 PetriNetUnfolder]: 0/59 cut-off events. [2021-03-24 13:16:11,610 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:11,610 INFO L84 FinitePrefix]: Finished finitePrefix Result has 207 conditions, 59 events. 0/59 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 167 event pairs, 0 based on Foata normal form. 0/59 useless extension candidates. Maximal degree in co-relation 0. Up to 15 conditions per place. [2021-03-24 13:16:11,611 INFO L142 LiptonReduction]: Number of co-enabled transitions 1204 [2021-03-24 13:16:11,676 INFO L154 LiptonReduction]: Checked pairs total: 966 [2021-03-24 13:16:11,677 INFO L156 LiptonReduction]: Total number of compositions: 14 [2021-03-24 13:16:11,677 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 70 [2021-03-24 13:16:11,677 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 13:16:11,678 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:11,678 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:11,678 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:11,678 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:11,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:11,678 INFO L82 PathProgramCache]: Analyzing trace with hash 16291, now seen corresponding path program 1 times [2021-03-24 13:16:11,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:11,678 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981190657] [2021-03-24 13:16:11,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:11,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:11,683 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:11,684 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:11,686 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 13:16:11,686 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981190657] [2021-03-24 13:16:11,686 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:11,686 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:11,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347093951] [2021-03-24 13:16:11,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:11,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:11,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:11,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:11,687 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 30 out of 61 [2021-03-24 13:16:11,687 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 60 places, 31 transitions, 314 flow. Second operand has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:11,688 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:11,688 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 30 of 61 [2021-03-24 13:16:11,688 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:16:23,375 INFO L129 PetriNetUnfolder]: 98305/114704 cut-off events. [2021-03-24 13:16:23,375 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:24,953 INFO L84 FinitePrefix]: Finished finitePrefix Result has 229542 conditions, 114704 events. 98305/114704 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6734. Compared 544782 event pairs, 98305 based on Foata normal form. 16398/129530 useless extension candidates. Maximal degree in co-relation 229376. Up to 114689 conditions per place. [2021-03-24 13:16:25,326 INFO L132 encePairwiseOnDemand]: 59/61 looper letters, 14 selfloop transitions, 1 changer transitions 0/30 dead transitions. [2021-03-24 13:16:25,327 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 61 places, 30 transitions, 342 flow [2021-03-24 13:16:25,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:16:25,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:16:25,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 106 transitions. [2021-03-24 13:16:25,327 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5792349726775956 [2021-03-24 13:16:25,328 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 106 transitions. [2021-03-24 13:16:25,328 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 106 transitions. [2021-03-24 13:16:25,328 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:16:25,328 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 106 transitions. [2021-03-24 13:16:25,328 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 35.333333333333336) internal successors, (106), 3 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:25,329 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 61.0) internal successors, (244), 4 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:25,329 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 61.0) internal successors, (244), 4 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:25,329 INFO L185 Difference]: Start difference. First operand has 60 places, 31 transitions, 314 flow. Second operand 3 states and 106 transitions. [2021-03-24 13:16:25,329 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 61 places, 30 transitions, 342 flow [2021-03-24 13:16:25,330 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 61 places, 30 transitions, 160 flow, removed 91 selfloop flow, removed 0 redundant places. [2021-03-24 13:16:25,331 INFO L241 Difference]: Finished difference. Result has 61 places, 30 transitions, 132 flow [2021-03-24 13:16:25,331 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=61, PETRI_DIFFERENCE_MINUEND_FLOW=130, PETRI_DIFFERENCE_MINUEND_PLACES=59, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=30, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=29, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=132, PETRI_PLACES=61, PETRI_TRANSITIONS=30} [2021-03-24 13:16:25,331 INFO L343 CegarLoopForPetriNet]: 60 programPoint places, 1 predicate places. [2021-03-24 13:16:25,331 INFO L480 AbstractCegarLoop]: Abstraction has has 61 places, 30 transitions, 132 flow [2021-03-24 13:16:25,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 30.666666666666668) internal successors, (92), 3 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:25,331 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:25,331 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:16:25,331 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-03-24 13:16:25,331 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:25,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:25,332 INFO L82 PathProgramCache]: Analyzing trace with hash -138593667, now seen corresponding path program 1 times [2021-03-24 13:16:25,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:25,332 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631693803] [2021-03-24 13:16:25,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:25,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:25,335 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:25,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:16:25,337 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:16:25,338 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:16:25,338 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:16:25,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-03-24 13:16:25,338 WARN L342 ceAbstractionStarter]: 14 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:16:25,339 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 15 thread instances. [2021-03-24 13:16:25,350 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:16:25,351 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:16:25,351 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:16:25,351 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:16:25,351 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:16:25,351 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:16:25,351 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:16:25,351 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:16:25,351 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:16:25,351 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:16:25,352 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 81 places, 50 transitions, 385 flow [2021-03-24 13:16:25,355 INFO L129 PetriNetUnfolder]: 0/95 cut-off events. [2021-03-24 13:16:25,355 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:25,355 INFO L84 FinitePrefix]: Finished finitePrefix Result has 261 conditions, 95 events. 0/95 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 296 event pairs, 0 based on Foata normal form. 0/79 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-24 13:16:25,355 INFO L82 GeneralOperation]: Start removeDead. Operand has 81 places, 50 transitions, 385 flow [2021-03-24 13:16:25,356 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 79 places, 48 transitions, 381 flow [2021-03-24 13:16:25,356 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:16:25,356 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-24 13:16:25,356 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 79 places, 48 transitions, 381 flow [2021-03-24 13:16:25,356 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 79 places, 48 transitions, 381 flow [2021-03-24 13:16:25,359 INFO L129 PetriNetUnfolder]: 0/63 cut-off events. [2021-03-24 13:16:25,359 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:25,359 INFO L84 FinitePrefix]: Finished finitePrefix Result has 229 conditions, 63 events. 0/63 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 179 event pairs, 0 based on Foata normal form. 0/63 useless extension candidates. Maximal degree in co-relation 0. Up to 16 conditions per place. [2021-03-24 13:16:25,360 INFO L142 LiptonReduction]: Number of co-enabled transitions 1380 [2021-03-24 13:16:25,420 INFO L154 LiptonReduction]: Checked pairs total: 1110 [2021-03-24 13:16:25,421 INFO L156 LiptonReduction]: Total number of compositions: 15 [2021-03-24 13:16:25,421 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 65 [2021-03-24 13:16:25,422 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 13:16:25,422 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:16:25,422 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:16:25,422 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:16:25,422 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:16:25,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:16:25,422 INFO L82 PathProgramCache]: Analyzing trace with hash 18339, now seen corresponding path program 1 times [2021-03-24 13:16:25,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:16:25,423 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369876387] [2021-03-24 13:16:25,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:16:25,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:16:25,426 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:16:25,427 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:16:25,428 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 13:16:25,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369876387] [2021-03-24 13:16:25,428 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:16:25,429 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:16:25,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39222645] [2021-03-24 13:16:25,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:16:25,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:16:25,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:16:25,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:16:25,429 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 32 out of 65 [2021-03-24 13:16:25,429 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 64 places, 33 transitions, 351 flow. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:16:25,429 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:16:25,429 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 32 of 65 [2021-03-24 13:16:25,430 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:17:00,929 INFO L129 PetriNetUnfolder]: 212993/245777 cut-off events. [2021-03-24 13:17:00,929 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:17:04,280 INFO L84 FinitePrefix]: Finished finitePrefix Result has 491705 conditions, 245777 events. 212993/245777 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 13156. Compared 1164137 event pairs, 212993 based on Foata normal form. 32783/275999 useless extension candidates. Maximal degree in co-relation 491520. Up to 245761 conditions per place. [2021-03-24 13:17:05,032 INFO L132 encePairwiseOnDemand]: 63/65 looper letters, 15 selfloop transitions, 1 changer transitions 0/32 dead transitions. [2021-03-24 13:17:05,033 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 65 places, 32 transitions, 381 flow [2021-03-24 13:17:05,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:17:05,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:17:05,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 113 transitions. [2021-03-24 13:17:05,033 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5794871794871795 [2021-03-24 13:17:05,033 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 113 transitions. [2021-03-24 13:17:05,033 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 113 transitions. [2021-03-24 13:17:05,033 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:17:05,034 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 113 transitions. [2021-03-24 13:17:05,034 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 37.666666666666664) internal successors, (113), 3 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:17:05,034 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 65.0) internal successors, (260), 4 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:17:05,034 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 65.0) internal successors, (260), 4 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:17:05,034 INFO L185 Difference]: Start difference. First operand has 64 places, 33 transitions, 351 flow. Second operand 3 states and 113 transitions. [2021-03-24 13:17:05,034 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 65 places, 32 transitions, 381 flow [2021-03-24 13:17:05,036 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 65 places, 32 transitions, 171 flow, removed 105 selfloop flow, removed 0 redundant places. [2021-03-24 13:17:05,036 INFO L241 Difference]: Finished difference. Result has 65 places, 32 transitions, 141 flow [2021-03-24 13:17:05,036 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=65, PETRI_DIFFERENCE_MINUEND_FLOW=139, PETRI_DIFFERENCE_MINUEND_PLACES=63, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=32, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=31, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=141, PETRI_PLACES=65, PETRI_TRANSITIONS=32} [2021-03-24 13:17:05,036 INFO L343 CegarLoopForPetriNet]: 64 programPoint places, 1 predicate places. [2021-03-24 13:17:05,036 INFO L480 AbstractCegarLoop]: Abstraction has has 65 places, 32 transitions, 141 flow [2021-03-24 13:17:05,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:17:05,037 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:17:05,037 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:17:05,037 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-03-24 13:17:05,037 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:17:05,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:17:05,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1465640138, now seen corresponding path program 1 times [2021-03-24 13:17:05,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:17:05,037 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351276347] [2021-03-24 13:17:05,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:17:05,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:17:05,040 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:17:05,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:17:05,041 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:17:05,043 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:17:05,043 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:17:05,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-03-24 13:17:05,043 WARN L342 ceAbstractionStarter]: 15 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:17:05,043 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 16 thread instances. [2021-03-24 13:17:05,056 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:17:05,056 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:17:05,056 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:17:05,056 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:17:05,057 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:17:05,057 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:17:05,057 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:17:05,057 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:17:05,057 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:17:05,057 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:17:05,057 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 86 places, 53 transitions, 426 flow [2021-03-24 13:17:05,061 INFO L129 PetriNetUnfolder]: 0/101 cut-off events. [2021-03-24 13:17:05,061 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:17:05,061 INFO L84 FinitePrefix]: Finished finitePrefix Result has 286 conditions, 101 events. 0/101 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 329 event pairs, 0 based on Foata normal form. 0/84 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-24 13:17:05,061 INFO L82 GeneralOperation]: Start removeDead. Operand has 86 places, 53 transitions, 426 flow [2021-03-24 13:17:05,062 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 84 places, 51 transitions, 422 flow [2021-03-24 13:17:05,062 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:17:05,062 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-24 13:17:05,062 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 84 places, 51 transitions, 422 flow [2021-03-24 13:17:05,062 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 84 places, 51 transitions, 422 flow [2021-03-24 13:17:05,065 INFO L129 PetriNetUnfolder]: 0/67 cut-off events. [2021-03-24 13:17:05,065 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:17:05,065 INFO L84 FinitePrefix]: Finished finitePrefix Result has 252 conditions, 67 events. 0/67 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 175 event pairs, 0 based on Foata normal form. 0/67 useless extension candidates. Maximal degree in co-relation 0. Up to 17 conditions per place. [2021-03-24 13:17:05,066 INFO L142 LiptonReduction]: Number of co-enabled transitions 1568 [2021-03-24 13:17:05,130 INFO L154 LiptonReduction]: Checked pairs total: 1264 [2021-03-24 13:17:05,130 INFO L156 LiptonReduction]: Total number of compositions: 16 [2021-03-24 13:17:05,130 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 68 [2021-03-24 13:17:05,131 INFO L129 PetriNetUnfolder]: 0/2 cut-off events. [2021-03-24 13:17:05,131 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:17:05,131 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:17:05,131 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:17:05,131 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:17:05,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:17:05,131 INFO L82 PathProgramCache]: Analyzing trace with hash 20515, now seen corresponding path program 1 times [2021-03-24 13:17:05,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:17:05,131 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936959083] [2021-03-24 13:17:05,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:17:05,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:17:05,135 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:17:05,136 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:17:05,138 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 13:17:05,138 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936959083] [2021-03-24 13:17:05,138 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:17:05,138 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:17:05,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087493417] [2021-03-24 13:17:05,139 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:17:05,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:17:05,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:17:05,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:17:05,139 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 34 out of 69 [2021-03-24 13:17:05,139 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 68 places, 35 transitions, 390 flow. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:17:05,139 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:17:05,139 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 34 of 69 [2021-03-24 13:17:05,140 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:18:45,301 INFO L129 PetriNetUnfolder]: 458753/524306 cut-off events. [2021-03-24 13:18:45,302 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:18:52,257 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1048781 conditions, 524306 events. 458753/524306 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 25986. Compared 2516437 event pairs, 458753 based on Foata normal form. 65552/585703 useless extension candidates. Maximal degree in co-relation 1048576. Up to 524289 conditions per place. [2021-03-24 13:18:53,967 INFO L132 encePairwiseOnDemand]: 67/69 looper letters, 16 selfloop transitions, 1 changer transitions 0/34 dead transitions. [2021-03-24 13:18:53,967 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 69 places, 34 transitions, 422 flow [2021-03-24 13:18:53,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:18:53,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:18:53,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 120 transitions. [2021-03-24 13:18:53,968 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5797101449275363 [2021-03-24 13:18:53,968 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 120 transitions. [2021-03-24 13:18:53,968 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 120 transitions. [2021-03-24 13:18:53,968 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:18:53,968 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 120 transitions. [2021-03-24 13:18:53,968 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:18:53,969 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 69.0) internal successors, (276), 4 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:18:53,969 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 69.0) internal successors, (276), 4 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:18:53,969 INFO L185 Difference]: Start difference. First operand has 68 places, 35 transitions, 390 flow. Second operand 3 states and 120 transitions. [2021-03-24 13:18:53,969 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 69 places, 34 transitions, 422 flow [2021-03-24 13:18:53,970 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 69 places, 34 transitions, 182 flow, removed 120 selfloop flow, removed 0 redundant places. [2021-03-24 13:18:53,971 INFO L241 Difference]: Finished difference. Result has 69 places, 34 transitions, 150 flow [2021-03-24 13:18:53,971 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=69, PETRI_DIFFERENCE_MINUEND_FLOW=148, PETRI_DIFFERENCE_MINUEND_PLACES=67, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=34, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=33, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=150, PETRI_PLACES=69, PETRI_TRANSITIONS=34} [2021-03-24 13:18:53,971 INFO L343 CegarLoopForPetriNet]: 68 programPoint places, 1 predicate places. [2021-03-24 13:18:53,971 INFO L480 AbstractCegarLoop]: Abstraction has has 69 places, 34 transitions, 150 flow [2021-03-24 13:18:53,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:18:53,971 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:18:53,971 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:18:53,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2021-03-24 13:18:53,972 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:18:53,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:18:53,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1833507392, now seen corresponding path program 1 times [2021-03-24 13:18:53,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:18:53,972 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783163835] [2021-03-24 13:18:53,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:18:53,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:18:53,975 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:18:53,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:18:53,980 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:18:53,981 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:18:53,981 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:18:53,982 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2021-03-24 13:18:53,982 WARN L342 ceAbstractionStarter]: 16 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:18:53,982 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 17 thread instances. [2021-03-24 13:18:53,995 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:18:53,995 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-24 13:18:53,995 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:18:53,995 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:18:53,995 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:18:53,995 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:18:53,995 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:18:53,995 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:18:53,995 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:18:53,996 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:18:53,996 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 91 places, 56 transitions, 469 flow [2021-03-24 13:18:54,000 INFO L129 PetriNetUnfolder]: 0/107 cut-off events. [2021-03-24 13:18:54,000 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:18:54,000 INFO L84 FinitePrefix]: Finished finitePrefix Result has 312 conditions, 107 events. 0/107 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 345 event pairs, 0 based on Foata normal form. 0/89 useless extension candidates. Maximal degree in co-relation 0. Up to 18 conditions per place. [2021-03-24 13:18:54,000 INFO L82 GeneralOperation]: Start removeDead. Operand has 91 places, 56 transitions, 469 flow [2021-03-24 13:18:54,001 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 89 places, 54 transitions, 465 flow [2021-03-24 13:18:54,001 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:18:54,001 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-24 13:18:54,001 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 89 places, 54 transitions, 465 flow [2021-03-24 13:18:54,001 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 89 places, 54 transitions, 465 flow [2021-03-24 13:18:54,004 INFO L129 PetriNetUnfolder]: 0/71 cut-off events. [2021-03-24 13:18:54,004 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:18:54,004 INFO L84 FinitePrefix]: Finished finitePrefix Result has 276 conditions, 71 events. 0/71 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 185 event pairs, 0 based on Foata normal form. 0/71 useless extension candidates. Maximal degree in co-relation 0. Up to 18 conditions per place. [2021-03-24 13:18:54,005 INFO L142 LiptonReduction]: Number of co-enabled transitions 1768 [2021-03-24 13:18:54,070 INFO L154 LiptonReduction]: Checked pairs total: 1428 [2021-03-24 13:18:54,070 INFO L156 LiptonReduction]: Total number of compositions: 17 [2021-03-24 13:18:54,070 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 69 [2021-03-24 13:18:54,071 INFO L129 PetriNetUnfolder]: 0/1 cut-off events. [2021-03-24 13:18:54,071 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:18:54,071 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:18:54,071 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1] [2021-03-24 13:18:54,071 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:18:54,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:18:54,071 INFO L82 PathProgramCache]: Analyzing trace with hash 22819, now seen corresponding path program 1 times [2021-03-24 13:18:54,071 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:18:54,071 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540686103] [2021-03-24 13:18:54,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:18:54,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:18:54,075 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:18:54,075 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:18:54,077 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 13:18:54,077 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540686103] [2021-03-24 13:18:54,077 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:18:54,077 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:18:54,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502692057] [2021-03-24 13:18:54,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:18:54,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:18:54,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:18:54,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:18:54,078 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 36 out of 73 [2021-03-24 13:18:54,078 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 72 places, 37 transitions, 431 flow. Second operand has 3 states, 3 states have (on average 36.666666666666664) internal successors, (110), 3 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:18:54,078 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:18:54,078 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 36 of 73 [2021-03-24 13:18:54,078 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand