/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-FA-SemanticLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/fork_loop_mutex.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-7cd14b8b9f04096d8ddfd3d9cd8a4ac590fe5404-7cd14b8 [2021-03-11 14:07:18,526 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-11 14:07:18,527 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-11 14:07:18,545 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-11 14:07:18,545 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-11 14:07:18,546 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-11 14:07:18,547 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-11 14:07:18,548 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-11 14:07:18,549 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-11 14:07:18,550 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-11 14:07:18,550 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-11 14:07:18,551 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2021-03-11 14:07:18,576 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-FA-SemanticLbe.epf [2021-03-11 14:07:18,590 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-11 14:07:18,590 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-11 14:07:18,591 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-11 14:07:18,591 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-11 14:07:18,591 INFO L138 SettingsManager]: * Use SBE=true [2021-03-11 14:07:18,591 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-11 14:07:18,592 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-11 14:07:18,592 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-11 14:07:18,592 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-11 14:07:18,592 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-11 14:07:18,592 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-11 14:07:18,592 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-11 14:07:18,592 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-11 14:07:18,593 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-11 14:07:18,593 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-11 14:07:18,593 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-11 14:07:18,593 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-11 14:07:18,593 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-11 14:07:18,593 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-11 14:07:18,593 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-11 14:07:18,593 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-11 14:07:18,593 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-11 14:07:18,594 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-11 14:07:18,594 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-11 14:07:18,594 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-11 14:07:18,594 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-11 14:07:18,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-11 14:07:18,594 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-03-11 14:07:18,594 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-11 14:07:18,833 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-11 14:07:18,852 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-11 14:07:18,854 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-11 14:07:18,855 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-11 14:07:18,855 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-11 14:07:18,856 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_mutex.bpl [2021-03-11 14:07:18,856 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/fork_loop_mutex.bpl' [2021-03-11 14:07:18,885 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-11 14:07:18,892 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-11 14:07:18,893 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-11 14:07:18,893 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-11 14:07:18,893 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-11 14:07:18,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,905 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,909 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-11 14:07:18,910 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-11 14:07:18,910 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-11 14:07:18,911 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-11 14:07:18,915 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,916 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,917 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,917 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,918 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,921 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,921 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/1) ... [2021-03-11 14:07:18,921 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-11 14:07:18,922 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-11 14:07:18,922 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-11 14:07:18,922 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-11 14:07:18,923 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (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 [2021-03-11 14:07:18,974 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-11 14:07:18,974 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-11 14:07:18,974 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-11 14:07:18,975 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2021-03-11 14:07:18,975 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2021-03-11 14:07:18,976 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2021-03-11 14:07:18,976 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-11 14:07:19,045 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-11 14:07:19,045 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-03-11 14:07:19,046 INFO L202 PluginConnector]: Adding new model fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 02:07:19 BoogieIcfgContainer [2021-03-11 14:07:19,046 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-11 14:07:19,047 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-11 14:07:19,047 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-11 14:07:19,060 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-11 14:07:19,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 02:07:18" (1/2) ... [2021-03-11 14:07:19,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a231ce6 and model type fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.03 02:07:19, skipping insertion in model container [2021-03-11 14:07:19,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_loop_mutex.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 02:07:19" (2/2) ... [2021-03-11 14:07:19,062 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_loop_mutex.bpl [2021-03-11 14:07:19,068 WARN L142 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-03-11 14:07:19,068 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-11 14:07:19,070 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-11 14:07:19,071 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-11 14:07:19,091 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 14:07:19,100 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-11 14:07:19,111 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 14:07:19,111 INFO L377 AbstractCegarLoop]: Hoare is true [2021-03-11 14:07:19,111 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 14:07:19,111 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 14:07:19,112 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 14:07:19,112 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 14:07:19,112 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 14:07:19,112 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 14:07:19,117 INFO L118 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-11 14:07:19,124 INFO L133 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 11 places, 9 transitions, 23 flow [2021-03-11 14:07:19,125 INFO L110 LiptonReduction]: Starting Lipton reduction on Petri net that has 11 places, 9 transitions, 23 flow [2021-03-11 14:07:19,126 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 11 places, 9 transitions, 23 flow [2021-03-11 14:07:19,136 INFO L129 PetriNetUnfolder]: 1/10 cut-off events. [2021-03-11 14:07:19,136 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 14:07:19,138 INFO L84 FinitePrefix]: Finished finitePrefix Result has 15 conditions, 10 events. 1/10 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. 0/8 useless extension candidates. Maximal degree in co-relation 6. Up to 2 conditions per place. [2021-03-11 14:07:19,138 INFO L116 LiptonReduction]: Number of co-enabled transitions 20 [2021-03-11 14:07:19,210 INFO L131 LiptonReduction]: Checked pairs total: 6 [2021-03-11 14:07:19,210 INFO L133 LiptonReduction]: Total number of compositions: 3 [2021-03-11 14:07:19,215 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 9 places, 7 transitions, 19 flow [2021-03-11 14:07:19,220 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 12 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,221 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-03-11 14:07:19,223 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:19,224 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-03-11 14:07:19,224 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION]=== [2021-03-11 14:07:19,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:19,227 INFO L82 PathProgramCache]: Analyzing trace with hash 45133, now seen corresponding path program 1 times [2021-03-11 14:07:19,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:19,232 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044577094] [2021-03-11 14:07:19,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:19,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:19,271 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:19,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:19,273 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:19,280 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 14:07:19,280 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 14:07:19,280 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-11 14:07:19,281 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 14:07:19,281 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-11 14:07:19,286 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 14:07:19,287 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-11 14:07:19,288 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 14:07:19,288 INFO L377 AbstractCegarLoop]: Hoare is true [2021-03-11 14:07:19,288 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 14:07:19,288 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 14:07:19,288 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 14:07:19,288 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 14:07:19,288 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 14:07:19,288 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 14:07:19,289 INFO L118 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-11 14:07:19,289 INFO L133 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 18 places, 15 transitions, 42 flow [2021-03-11 14:07:19,290 INFO L110 LiptonReduction]: Starting Lipton reduction on Petri net that has 18 places, 15 transitions, 42 flow [2021-03-11 14:07:19,290 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 18 places, 15 transitions, 42 flow [2021-03-11 14:07:19,293 INFO L129 PetriNetUnfolder]: 2/17 cut-off events. [2021-03-11 14:07:19,293 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 14:07:19,294 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 17 events. 2/17 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 33 event pairs, 0 based on Foata normal form. 0/13 useless extension candidates. Maximal degree in co-relation 14. Up to 3 conditions per place. [2021-03-11 14:07:19,294 INFO L116 LiptonReduction]: Number of co-enabled transitions 100 [2021-03-11 14:07:19,327 INFO L131 LiptonReduction]: Checked pairs total: 90 [2021-03-11 14:07:19,327 INFO L133 LiptonReduction]: Total number of compositions: 0 [2021-03-11 14:07:19,328 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 18 places, 15 transitions, 42 flow [2021-03-11 14:07:19,334 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 88 states, 77 states have (on average 2.896103896103896) internal successors, (223), 87 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,334 INFO L276 IsEmpty]: Start isEmpty. Operand has 88 states, 77 states have (on average 2.896103896103896) internal successors, (223), 87 states have internal predecessors, (223), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-03-11 14:07:19,334 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:19,335 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-03-11 14:07:19,335 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:19,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:19,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1958290, now seen corresponding path program 1 times [2021-03-11 14:07:19,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:19,336 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081984359] [2021-03-11 14:07:19,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:19,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:19,340 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:19,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:19,342 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:19,343 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 14:07:19,343 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 14:07:19,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-11 14:07:19,344 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 14:07:19,345 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-11 14:07:19,352 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 14:07:19,352 INFO L253 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-03-11 14:07:19,353 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 14:07:19,353 INFO L377 AbstractCegarLoop]: Hoare is true [2021-03-11 14:07:19,353 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 14:07:19,353 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 14:07:19,354 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 14:07:19,354 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 14:07:19,354 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 14:07:19,354 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 14:07:19,355 INFO L118 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-11 14:07:19,355 INFO L133 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 25 places, 21 transitions, 63 flow [2021-03-11 14:07:19,355 INFO L110 LiptonReduction]: Starting Lipton reduction on Petri net that has 25 places, 21 transitions, 63 flow [2021-03-11 14:07:19,355 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 25 places, 21 transitions, 63 flow [2021-03-11 14:07:19,360 INFO L129 PetriNetUnfolder]: 3/24 cut-off events. [2021-03-11 14:07:19,360 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 14:07:19,361 INFO L84 FinitePrefix]: Finished finitePrefix Result has 40 conditions, 24 events. 3/24 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 65 event pairs, 0 based on Foata normal form. 0/18 useless extension candidates. Maximal degree in co-relation 26. Up to 4 conditions per place. [2021-03-11 14:07:19,362 INFO L116 LiptonReduction]: Number of co-enabled transitions 240 [2021-03-11 14:07:19,401 INFO L131 LiptonReduction]: Checked pairs total: 234 [2021-03-11 14:07:19,402 INFO L133 LiptonReduction]: Total number of compositions: 0 [2021-03-11 14:07:19,403 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 25 places, 21 transitions, 63 flow [2021-03-11 14:07:19,429 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 438 states, 415 states have (on average 3.730120481927711) internal successors, (1548), 437 states have internal predecessors, (1548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,430 INFO L276 IsEmpty]: Start isEmpty. Operand has 438 states, 415 states have (on average 3.730120481927711) internal successors, (1548), 437 states have internal predecessors, (1548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-03-11 14:07:19,431 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:19,431 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-03-11 14:07:19,431 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:19,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:19,431 INFO L82 PathProgramCache]: Analyzing trace with hash 2609499, now seen corresponding path program 1 times [2021-03-11 14:07:19,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:19,432 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689824212] [2021-03-11 14:07:19,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:19,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 14:07:19,458 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:19,458 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:19,463 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:19,464 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:19,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 14:07:19,468 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689824212] [2021-03-11 14:07:19,471 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 14:07:19,471 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-11 14:07:19,471 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863240826] [2021-03-11 14:07:19,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-11 14:07:19,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 14:07:19,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-11 14:07:19,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:07:19,484 INFO L87 Difference]: Start difference. First operand has 438 states, 415 states have (on average 3.730120481927711) internal successors, (1548), 437 states have internal predecessors, (1548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-11 14:07:19,569 INFO L93 Difference]: Finished difference Result 1150 states and 3931 transitions. [2021-03-11 14:07:19,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-11 14:07:19,570 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-03-11 14:07:19,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-11 14:07:19,591 INFO L225 Difference]: With dead ends: 1150 [2021-03-11 14:07:19,592 INFO L226 Difference]: Without dead ends: 1126 [2021-03-11 14:07:19,592 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.4ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:07:19,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1126 states. [2021-03-11 14:07:19,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1126 to 1046. [2021-03-11 14:07:19,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1046 states, 1028 states have (on average 3.622568093385214) internal successors, (3724), 1045 states have internal predecessors, (3724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1046 states to 1046 states and 3724 transitions. [2021-03-11 14:07:19,669 INFO L78 Accepts]: Start accepts. Automaton has 1046 states and 3724 transitions. Word has length 4 [2021-03-11 14:07:19,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-11 14:07:19,669 INFO L480 AbstractCegarLoop]: Abstraction has 1046 states and 3724 transitions. [2021-03-11 14:07:19,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,670 INFO L276 IsEmpty]: Start isEmpty. Operand 1046 states and 3724 transitions. [2021-03-11 14:07:19,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-03-11 14:07:19,670 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:19,670 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-03-11 14:07:19,670 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-11 14:07:19,671 INFO L428 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:19,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:19,671 INFO L82 PathProgramCache]: Analyzing trace with hash 80901459, now seen corresponding path program 1 times [2021-03-11 14:07:19,671 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:19,671 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346395729] [2021-03-11 14:07:19,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:19,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:19,674 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:19,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:19,676 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:19,677 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 14:07:19,677 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 14:07:19,677 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-11 14:07:19,678 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 14:07:19,678 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-11 14:07:19,684 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 14:07:19,684 INFO L253 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-03-11 14:07:19,685 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 14:07:19,685 INFO L377 AbstractCegarLoop]: Hoare is true [2021-03-11 14:07:19,685 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 14:07:19,685 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 14:07:19,685 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 14:07:19,685 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 14:07:19,685 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 14:07:19,685 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 14:07:19,686 INFO L118 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-11 14:07:19,686 INFO L133 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 32 places, 27 transitions, 86 flow [2021-03-11 14:07:19,686 INFO L110 LiptonReduction]: Starting Lipton reduction on Petri net that has 32 places, 27 transitions, 86 flow [2021-03-11 14:07:19,686 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 32 places, 27 transitions, 86 flow [2021-03-11 14:07:19,690 INFO L129 PetriNetUnfolder]: 4/31 cut-off events. [2021-03-11 14:07:19,690 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 14:07:19,691 INFO L84 FinitePrefix]: Finished finitePrefix Result has 54 conditions, 31 events. 4/31 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 87 event pairs, 0 based on Foata normal form. 0/23 useless extension candidates. Maximal degree in co-relation 39. Up to 5 conditions per place. [2021-03-11 14:07:19,692 INFO L116 LiptonReduction]: Number of co-enabled transitions 440 [2021-03-11 14:07:19,732 INFO L131 LiptonReduction]: Checked pairs total: 444 [2021-03-11 14:07:19,732 INFO L133 LiptonReduction]: Total number of compositions: 0 [2021-03-11 14:07:19,733 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 32 places, 27 transitions, 86 flow [2021-03-11 14:07:19,852 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 2188 states, 2141 states have (on average 4.634750116767865) internal successors, (9923), 2187 states have internal predecessors, (9923), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,857 INFO L276 IsEmpty]: Start isEmpty. Operand has 2188 states, 2141 states have (on average 4.634750116767865) internal successors, (9923), 2187 states have internal predecessors, (9923), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:19,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-03-11 14:07:19,857 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:19,858 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-03-11 14:07:19,858 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:19,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:19,859 INFO L82 PathProgramCache]: Analyzing trace with hash 3445312, now seen corresponding path program 1 times [2021-03-11 14:07:19,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:19,859 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900912525] [2021-03-11 14:07:19,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:19,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 14:07:19,876 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:19,877 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:19,880 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:19,881 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:19,883 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 14:07:19,883 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900912525] [2021-03-11 14:07:19,883 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 14:07:19,884 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-11 14:07:19,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495913741] [2021-03-11 14:07:19,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-11 14:07:19,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 14:07:19,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-11 14:07:19,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:07:19,891 INFO L87 Difference]: Start difference. First operand has 2188 states, 2141 states have (on average 4.634750116767865) internal successors, (9923), 2187 states have internal predecessors, (9923), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:20,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-11 14:07:20,035 INFO L93 Difference]: Finished difference Result 6142 states and 26589 transitions. [2021-03-11 14:07:20,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-11 14:07:20,036 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-03-11 14:07:20,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-11 14:07:20,074 INFO L225 Difference]: With dead ends: 6142 [2021-03-11 14:07:20,074 INFO L226 Difference]: Without dead ends: 6104 [2021-03-11 14:07:20,075 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:07:20,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6104 states. [2021-03-11 14:07:20,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6104 to 5838. [2021-03-11 14:07:20,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5838 states, 5797 states have (on average 4.474038295670174) internal successors, (25936), 5837 states have internal predecessors, (25936), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:20,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5838 states to 5838 states and 25936 transitions. [2021-03-11 14:07:20,364 INFO L78 Accepts]: Start accepts. Automaton has 5838 states and 25936 transitions. Word has length 4 [2021-03-11 14:07:20,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-11 14:07:20,365 INFO L480 AbstractCegarLoop]: Abstraction has 5838 states and 25936 transitions. [2021-03-11 14:07:20,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:20,365 INFO L276 IsEmpty]: Start isEmpty. Operand 5838 states and 25936 transitions. [2021-03-11 14:07:20,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-03-11 14:07:20,367 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:20,367 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-03-11 14:07:20,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-11 14:07:20,367 INFO L428 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:20,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:20,368 INFO L82 PathProgramCache]: Analyzing trace with hash -983497029, now seen corresponding path program 1 times [2021-03-11 14:07:20,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:20,371 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570808140] [2021-03-11 14:07:20,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:20,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:20,379 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:20,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:20,383 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:20,385 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 14:07:20,385 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 14:07:20,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-11 14:07:20,385 WARN L342 ceAbstractionStarter]: 4 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 14:07:20,386 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 5 thread instances. [2021-03-11 14:07:20,432 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 14:07:20,432 INFO L253 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2021-03-11 14:07:20,433 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 14:07:20,433 INFO L377 AbstractCegarLoop]: Hoare is true [2021-03-11 14:07:20,433 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 14:07:20,433 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 14:07:20,433 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 14:07:20,433 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 14:07:20,433 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 14:07:20,433 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 14:07:20,434 INFO L118 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-11 14:07:20,434 INFO L133 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 39 places, 33 transitions, 111 flow [2021-03-11 14:07:20,434 INFO L110 LiptonReduction]: Starting Lipton reduction on Petri net that has 39 places, 33 transitions, 111 flow [2021-03-11 14:07:20,434 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 39 places, 33 transitions, 111 flow [2021-03-11 14:07:20,438 INFO L129 PetriNetUnfolder]: 5/38 cut-off events. [2021-03-11 14:07:20,438 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 14:07:20,439 INFO L84 FinitePrefix]: Finished finitePrefix Result has 69 conditions, 38 events. 5/38 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 106 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 53. Up to 6 conditions per place. [2021-03-11 14:07:20,439 INFO L116 LiptonReduction]: Number of co-enabled transitions 700 [2021-03-11 14:07:20,503 INFO L131 LiptonReduction]: Checked pairs total: 720 [2021-03-11 14:07:20,503 INFO L133 LiptonReduction]: Total number of compositions: 0 [2021-03-11 14:07:20,503 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 39 places, 33 transitions, 111 flow [2021-03-11 14:07:21,311 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 10938 states, 10843 states have (on average 5.584063451074426) internal successors, (60548), 10937 states have internal predecessors, (60548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:21,334 INFO L276 IsEmpty]: Start isEmpty. Operand has 10938 states, 10843 states have (on average 5.584063451074426) internal successors, (60548), 10937 states have internal predecessors, (60548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:21,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-03-11 14:07:21,335 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:21,335 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-03-11 14:07:21,335 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:21,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:21,335 INFO L82 PathProgramCache]: Analyzing trace with hash 4465829, now seen corresponding path program 1 times [2021-03-11 14:07:21,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:21,336 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313451314] [2021-03-11 14:07:21,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:21,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 14:07:21,341 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:21,342 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:21,344 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:21,344 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:21,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 14:07:21,347 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313451314] [2021-03-11 14:07:21,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 14:07:21,347 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-11 14:07:21,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347866071] [2021-03-11 14:07:21,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-11 14:07:21,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 14:07:21,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-11 14:07:21,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:07:21,372 INFO L87 Difference]: Start difference. First operand has 10938 states, 10843 states have (on average 5.584063451074426) internal successors, (60548), 10937 states have internal predecessors, (60548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:21,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-11 14:07:21,952 INFO L93 Difference]: Finished difference Result 31662 states and 166199 transitions. [2021-03-11 14:07:21,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-11 14:07:21,953 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-03-11 14:07:21,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-11 14:07:22,319 INFO L225 Difference]: With dead ends: 31662 [2021-03-11 14:07:22,319 INFO L226 Difference]: Without dead ends: 31607 [2021-03-11 14:07:22,319 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.1ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:07:22,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31607 states. [2021-03-11 14:07:23,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31607 to 30777. [2021-03-11 14:07:23,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30777 states, 30689 states have (on average 5.347942259441494) internal successors, (164123), 30776 states have internal predecessors, (164123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:23,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30777 states to 30777 states and 164123 transitions. [2021-03-11 14:07:23,780 INFO L78 Accepts]: Start accepts. Automaton has 30777 states and 164123 transitions. Word has length 4 [2021-03-11 14:07:23,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-11 14:07:23,780 INFO L480 AbstractCegarLoop]: Abstraction has 30777 states and 164123 transitions. [2021-03-11 14:07:23,781 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:23,781 INFO L276 IsEmpty]: Start isEmpty. Operand 30777 states and 164123 transitions. [2021-03-11 14:07:23,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-03-11 14:07:23,782 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:23,782 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-11 14:07:23,782 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-11 14:07:23,782 INFO L428 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:23,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:23,783 INFO L82 PathProgramCache]: Analyzing trace with hash -76614834, now seen corresponding path program 1 times [2021-03-11 14:07:23,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:23,783 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509538154] [2021-03-11 14:07:23,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:23,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:23,785 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:23,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:07:23,787 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:07:23,788 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 14:07:23,788 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 14:07:23,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-11 14:07:23,788 WARN L342 ceAbstractionStarter]: 5 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 14:07:23,788 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 6 thread instances. [2021-03-11 14:07:23,796 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 14:07:23,796 INFO L253 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2021-03-11 14:07:23,796 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 14:07:23,796 INFO L377 AbstractCegarLoop]: Hoare is true [2021-03-11 14:07:23,797 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 14:07:23,797 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 14:07:23,797 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 14:07:23,797 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 14:07:23,797 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 14:07:23,797 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 14:07:23,797 INFO L118 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-11 14:07:23,798 INFO L133 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 46 places, 39 transitions, 138 flow [2021-03-11 14:07:23,798 INFO L110 LiptonReduction]: Starting Lipton reduction on Petri net that has 46 places, 39 transitions, 138 flow [2021-03-11 14:07:23,798 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 46 places, 39 transitions, 138 flow [2021-03-11 14:07:23,802 INFO L129 PetriNetUnfolder]: 6/45 cut-off events. [2021-03-11 14:07:23,802 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 14:07:23,803 INFO L84 FinitePrefix]: Finished finitePrefix Result has 85 conditions, 45 events. 6/45 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 7. Compared 131 event pairs, 0 based on Foata normal form. 0/33 useless extension candidates. Maximal degree in co-relation 68. Up to 7 conditions per place. [2021-03-11 14:07:23,804 INFO L116 LiptonReduction]: Number of co-enabled transitions 1020 [2021-03-11 14:07:23,865 INFO L131 LiptonReduction]: Checked pairs total: 1062 [2021-03-11 14:07:23,866 INFO L133 LiptonReduction]: Total number of compositions: 0 [2021-03-11 14:07:23,866 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 46 places, 39 transitions, 138 flow [2021-03-11 14:07:38,927 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 54688 states, 54497 states have (on average 6.558581206304934) internal successors, (357423), 54687 states have internal predecessors, (357423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:39,010 INFO L276 IsEmpty]: Start isEmpty. Operand has 54688 states, 54497 states have (on average 6.558581206304934) internal successors, (357423), 54687 states have internal predecessors, (357423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:39,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-03-11 14:07:39,012 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:39,012 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-03-11 14:07:39,012 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:39,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:39,013 INFO L82 PathProgramCache]: Analyzing trace with hash 5672010, now seen corresponding path program 1 times [2021-03-11 14:07:39,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:39,013 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644829914] [2021-03-11 14:07:39,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:39,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 14:07:39,020 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:39,020 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:39,022 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:39,022 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:39,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 14:07:39,024 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644829914] [2021-03-11 14:07:39,024 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 14:07:39,024 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-11 14:07:39,025 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051544228] [2021-03-11 14:07:39,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-11 14:07:39,025 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 14:07:39,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-11 14:07:39,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:07:39,108 INFO L87 Difference]: Start difference. First operand has 54688 states, 54497 states have (on average 6.558581206304934) internal successors, (357423), 54687 states have internal predecessors, (357423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:41,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-11 14:07:41,079 INFO L93 Difference]: Finished difference Result 160806 states and 992685 transitions. [2021-03-11 14:07:41,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-11 14:07:41,080 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-03-11 14:07:41,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-11 14:07:42,409 INFO L225 Difference]: With dead ends: 160806 [2021-03-11 14:07:42,409 INFO L226 Difference]: Without dead ends: 160731 [2021-03-11 14:07:42,409 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:07:46,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160731 states. [2021-03-11 14:07:50,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160731 to 158203. [2021-03-11 14:07:51,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158203 states, 158020 states have (on average 6.239305151246677) internal successors, (985935), 158202 states have internal predecessors, (985935), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:52,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158203 states to 158203 states and 985935 transitions. [2021-03-11 14:07:52,872 INFO L78 Accepts]: Start accepts. Automaton has 158203 states and 985935 transitions. Word has length 4 [2021-03-11 14:07:52,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-11 14:07:52,872 INFO L480 AbstractCegarLoop]: Abstraction has 158203 states and 985935 transitions. [2021-03-11 14:07:52,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:52,873 INFO L276 IsEmpty]: Start isEmpty. Operand 158203 states and 985935 transitions. [2021-03-11 14:07:52,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-03-11 14:07:52,874 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:07:52,874 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 14:07:52,874 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-11 14:07:52,874 INFO L428 AbstractCegarLoop]: === Iteration 2 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:07:52,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:07:52,874 INFO L82 PathProgramCache]: Analyzing trace with hash -1444915002, now seen corresponding path program 1 times [2021-03-11 14:07:52,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:07:52,875 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697987522] [2021-03-11 14:07:52,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:07:52,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 14:07:52,885 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:52,885 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:52,888 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:52,888 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:52,891 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:52,891 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:52,894 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:07:52,895 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:07:52,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-11 14:07:52,895 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697987522] [2021-03-11 14:07:52,895 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 14:07:52,895 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-11 14:07:52,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617762001] [2021-03-11 14:07:52,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-11 14:07:52,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 14:07:52,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-11 14:07:52,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-03-11 14:07:52,896 INFO L87 Difference]: Start difference. First operand 158203 states and 985935 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:07:57,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-11 14:07:57,763 INFO L93 Difference]: Finished difference Result 375293 states and 2224451 transitions. [2021-03-11 14:07:57,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-11 14:07:57,787 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-03-11 14:07:57,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-11 14:07:59,872 INFO L225 Difference]: With dead ends: 375293 [2021-03-11 14:07:59,872 INFO L226 Difference]: Without dead ends: 374443 [2021-03-11 14:07:59,873 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.2ms TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-03-11 14:08:07,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374443 states. [2021-03-11 14:08:15,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374443 to 196711. [2021-03-11 14:08:15,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196711 states, 196531 states have (on average 6.0801196757763405) internal successors, (1194932), 196710 states have internal predecessors, (1194932), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:08:17,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196711 states to 196711 states and 1194932 transitions. [2021-03-11 14:08:17,685 INFO L78 Accepts]: Start accepts. Automaton has 196711 states and 1194932 transitions. Word has length 8 [2021-03-11 14:08:17,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-03-11 14:08:17,685 INFO L480 AbstractCegarLoop]: Abstraction has 196711 states and 1194932 transitions. [2021-03-11 14:08:17,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:08:17,686 INFO L276 IsEmpty]: Start isEmpty. Operand 196711 states and 1194932 transitions. [2021-03-11 14:08:17,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-03-11 14:08:17,687 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:08:17,687 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 14:08:17,687 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-11 14:08:17,687 INFO L428 AbstractCegarLoop]: === Iteration 3 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:08:17,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:08:17,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1427804828, now seen corresponding path program 1 times [2021-03-11 14:08:17,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:08:17,688 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325990591] [2021-03-11 14:08:17,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:08:17,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:08:17,690 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:08:17,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 14:08:17,698 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 14:08:17,699 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 14:08:17,699 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 14:08:17,699 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-11 14:08:17,699 WARN L342 ceAbstractionStarter]: 6 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 14:08:17,700 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 7 thread instances. [2021-03-11 14:08:17,710 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-11 14:08:17,710 INFO L253 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2021-03-11 14:08:17,710 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 14:08:17,711 INFO L377 AbstractCegarLoop]: Hoare is true [2021-03-11 14:08:17,711 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 14:08:17,711 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 14:08:17,711 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 14:08:17,711 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 14:08:17,711 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 14:08:17,711 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 14:08:17,711 INFO L118 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-11 14:08:17,711 INFO L133 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 53 places, 45 transitions, 167 flow [2021-03-11 14:08:17,712 INFO L110 LiptonReduction]: Starting Lipton reduction on Petri net that has 53 places, 45 transitions, 167 flow [2021-03-11 14:08:17,712 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 53 places, 45 transitions, 167 flow [2021-03-11 14:08:17,716 INFO L129 PetriNetUnfolder]: 7/52 cut-off events. [2021-03-11 14:08:17,716 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 14:08:17,719 INFO L84 FinitePrefix]: Finished finitePrefix Result has 102 conditions, 52 events. 7/52 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 9. Compared 172 event pairs, 0 based on Foata normal form. 0/38 useless extension candidates. Maximal degree in co-relation 84. Up to 8 conditions per place. [2021-03-11 14:08:17,720 INFO L116 LiptonReduction]: Number of co-enabled transitions 1400 [2021-03-11 14:08:17,780 INFO L131 LiptonReduction]: Checked pairs total: 1470 [2021-03-11 14:08:17,780 INFO L133 LiptonReduction]: Total number of compositions: 0 [2021-03-11 14:08:17,781 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 53 places, 45 transitions, 167 flow [2021-03-11 14:17:24,203 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 273438 states, 273055 states have (on average 7.546274560070316) internal successors, (2060548), 273437 states have internal predecessors, (2060548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:17:24,595 INFO L276 IsEmpty]: Start isEmpty. Operand has 273438 states, 273055 states have (on average 7.546274560070316) internal successors, (2060548), 273437 states have internal predecessors, (2060548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:17:24,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-03-11 14:17:24,595 INFO L511 BasicCegarLoop]: Found error trace [2021-03-11 14:17:24,596 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-03-11 14:17:24,596 INFO L428 AbstractCegarLoop]: === Iteration 1 === [threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, threadErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, threadErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 14:17:24,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 14:17:24,596 INFO L82 PathProgramCache]: Analyzing trace with hash 7061455, now seen corresponding path program 1 times [2021-03-11 14:17:24,596 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 14:17:24,596 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623141133] [2021-03-11 14:17:24,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 14:17:24,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 14:17:24,602 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:17:24,602 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:17:24,612 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 14:17:24,612 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 14:17:24,614 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 14:17:24,614 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623141133] [2021-03-11 14:17:24,614 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 14:17:24,614 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-11 14:17:24,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857157167] [2021-03-11 14:17:24,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-11 14:17:24,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 14:17:24,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-11 14:17:24,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 14:17:24,994 INFO L87 Difference]: Start difference. First operand has 273438 states, 273055 states have (on average 7.546274560070316) internal successors, (2060548), 273437 states have internal predecessors, (2060548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 14:17:37,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-03-11 14:17:37,832 INFO L93 Difference]: Finished difference Result 810902 states and 5756895 transitions. [2021-03-11 14:17:37,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-11 14:17:37,833 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2021-03-11 14:17:37,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-03-11 14:17:44,366 INFO L225 Difference]: With dead ends: 810902 [2021-03-11 14:17:44,366 INFO L226 Difference]: Without dead ends: 810804 [2021-03-11 14:17:44,367 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.7ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12