/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/regression/ForkInLoop02-Incrementer.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-24 13:29:28,369 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-24 13:29:28,372 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-24 13:29:28,405 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-24 13:29:28,459 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 13:29:28,507 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-24 13:29:28,508 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-24 13:29:28,511 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-24 13:29:28,511 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-24 13:29:28,511 INFO L138 SettingsManager]: * Use SBE=true [2021-03-24 13:29:28,511 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-24 13:29:28,512 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-24 13:29:28,512 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-24 13:29:28,512 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-24 13:29:28,512 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-24 13:29:28,513 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-24 13:29:28,513 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-24 13:29:28,513 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-24 13:29:28,513 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-24 13:29:28,513 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-24 13:29:28,513 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-24 13:29:28,514 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-24 13:29:28,514 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-24 13:29:28,514 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-24 13:29:28,514 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-24 13:29:28,514 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-24 13:29:28,514 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 13:29:28,515 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-24 13:29:28,515 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-24 13:29:28,515 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-24 13:29:28,515 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-24 13:29:28,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-24 13:29:28,515 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=VARIABLE_BASED_MOVER_CHECK [2021-03-24 13:29:28,515 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-24 13:29:28,515 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-24 13:29:28,805 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-24 13:29:28,826 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-24 13:29:28,828 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-24 13:29:28,829 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-24 13:29:28,830 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-24 13:29:28,831 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/ForkInLoop02-Incrementer.bpl [2021-03-24 13:29:28,831 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/ForkInLoop02-Incrementer.bpl' [2021-03-24 13:29:28,866 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-24 13:29:28,868 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-24 13:29:28,870 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-24 13:29:28,870 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-24 13:29:28,870 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-24 13:29:28,882 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,890 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,896 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-24 13:29:28,897 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-24 13:29:28,898 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-24 13:29:28,898 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-24 13:29:28,904 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,905 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,906 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,906 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,908 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,910 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,910 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/1) ... [2021-03-24 13:29:28,912 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-24 13:29:28,912 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-24 13:29:28,912 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-24 13:29:28,912 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-24 13:29:28,913 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (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 13:29:28,981 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2021-03-24 13:29:28,982 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-03-24 13:29:28,983 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-03-24 13:29:28,983 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-24 13:29:28,983 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-24 13:29:28,984 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 13:29:29,102 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-24 13:29:29,103 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-24 13:29:29,104 INFO L202 PluginConnector]: Adding new model ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:29:29 BoogieIcfgContainer [2021-03-24 13:29:29,105 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-24 13:29:29,107 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-24 13:29:29,107 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-24 13:29:29,109 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-24 13:29:29,110 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:29:28" (1/2) ... [2021-03-24 13:29:29,110 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fc3a990 and model type ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.03 01:29:29, skipping insertion in model container [2021-03-24 13:29:29,111 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:29:29" (2/2) ... [2021-03-24 13:29:29,112 INFO L111 eAbstractionObserver]: Analyzing ICFG ForkInLoop02-Incrementer.bpl [2021-03-24 13:29:29,119 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-24 13:29:29,122 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-24 13:29:29,123 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-24 13:29:29,156 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:29:29,170 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-24 13:29:29,196 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:29:29,196 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:29:29,196 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:29:29,196 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:29:29,197 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:29:29,197 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:29:29,197 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:29:29,197 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:29:29,204 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 13:29:29,216 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 13:29:29,216 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:29:29,218 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 4. Compared 10 event pairs, 0 based on Foata normal form. 0/10 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:29:29,218 INFO L82 GeneralOperation]: Start removeDead. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 13:29:29,221 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 13 places, 10 transitions, 25 flow [2021-03-24 13:29:29,222 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:29:29,230 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 13 places, 10 transitions, 25 flow [2021-03-24 13:29:29,232 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 13 places, 10 transitions, 25 flow [2021-03-24 13:29:29,233 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 13:29:29,236 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 13:29:29,237 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:29:29,237 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 4. Compared 13 event pairs, 0 based on Foata normal form. 0/10 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:29:29,238 INFO L142 LiptonReduction]: Number of co-enabled transitions 24 [2021-03-24 13:29:29,339 INFO L154 LiptonReduction]: Checked pairs total: 9 [2021-03-24 13:29:29,339 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 13:29:29,341 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 120 [2021-03-24 13:29:29,357 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-24 13:29:29,357 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:29:29,357 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:29,358 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-24 13:29:29,358 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:29,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:29,362 INFO L82 PathProgramCache]: Analyzing trace with hash 59487, now seen corresponding path program 1 times [2021-03-24 13:29:29,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:29,369 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367153804] [2021-03-24 13:29:29,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:29,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:29:29,469 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:29,469 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:29,492 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 13:29:29,493 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367153804] [2021-03-24 13:29:29,493 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:29:29,493 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 13:29:29,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382820175] [2021-03-24 13:29:29,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 13:29:29,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:29:29,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 13:29:29,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 13:29:29,514 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 14 [2021-03-24 13:29:29,515 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 10 places, 7 transitions, 19 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 13:29:29,515 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:29:29,515 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 14 [2021-03-24 13:29:29,516 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:29:29,526 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 13:29:29,526 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 13:29:29,526 INFO L84 FinitePrefix]: Finished finitePrefix Result has 15 conditions, 7 events. 0/7 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 7 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 13:29:29,527 INFO L132 encePairwiseOnDemand]: 11/14 looper letters, 0 selfloop transitions, 2 changer transitions 1/6 dead transitions. [2021-03-24 13:29:29,527 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 11 places, 6 transitions, 21 flow [2021-03-24 13:29:29,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 13:29:29,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 13:29:29,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 21 transitions. [2021-03-24 13:29:29,535 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5 [2021-03-24 13:29:29,535 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 21 transitions. [2021-03-24 13:29:29,536 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 21 transitions. [2021-03-24 13:29:29,536 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:29:29,538 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 21 transitions. [2021-03-24 13:29:29,539 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 7.0) internal successors, (21), 3 states have internal predecessors, (21), 0 states have call successors, (0), 0 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 13:29:29,542 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:29:29,542 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:29:29,544 INFO L185 Difference]: Start difference. First operand has 10 places, 7 transitions, 19 flow. Second operand 3 states and 21 transitions. [2021-03-24 13:29:29,544 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 11 places, 6 transitions, 21 flow [2021-03-24 13:29:29,546 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 11 places, 6 transitions, 21 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-24 13:29:29,547 INFO L241 Difference]: Finished difference. Result has 11 places, 5 transitions, 19 flow [2021-03-24 13:29:29,548 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=14, PETRI_DIFFERENCE_MINUEND_FLOW=17, PETRI_DIFFERENCE_MINUEND_PLACES=9, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=6, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=4, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=19, PETRI_PLACES=11, PETRI_TRANSITIONS=5} [2021-03-24 13:29:29,549 INFO L343 CegarLoopForPetriNet]: 10 programPoint places, 1 predicate places. [2021-03-24 13:29:29,549 INFO L480 AbstractCegarLoop]: Abstraction has has 11 places, 5 transitions, 19 flow [2021-03-24 13:29:29,549 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 13:29:29,549 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:29,550 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:29:29,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-24 13:29:29,550 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:29,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:29,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1843627, now seen corresponding path program 1 times [2021-03-24 13:29:29,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:29,551 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867319566] [2021-03-24 13:29:29,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:29,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:29:29,557 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:29:29,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:29:29,561 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:29:29,571 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:29:29,571 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:29:29,572 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-24 13:29:29,572 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:29:29,573 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-24 13:29:29,579 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:29:29,579 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-24 13:29:29,581 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:29:29,581 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:29:29,581 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:29:29,582 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:29:29,582 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:29:29,582 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:29:29,582 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:29:29,582 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:29:29,583 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 13:29:29,587 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-24 13:29:29,587 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 13:29:29,588 INFO L84 FinitePrefix]: Finished finitePrefix Result has 28 conditions, 18 events. 0/18 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 31 event pairs, 0 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-24 13:29:29,588 INFO L82 GeneralOperation]: Start removeDead. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 13:29:29,588 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 20 places, 15 transitions, 42 flow [2021-03-24 13:29:29,588 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:29:29,589 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 20 places, 15 transitions, 42 flow [2021-03-24 13:29:29,589 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 20 places, 15 transitions, 42 flow [2021-03-24 13:29:29,589 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 13:29:29,593 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-24 13:29:29,593 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 13:29:29,593 INFO L84 FinitePrefix]: Finished finitePrefix Result has 28 conditions, 18 events. 0/18 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 28 event pairs, 0 based on Foata normal form. 0/16 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-24 13:29:29,594 INFO L142 LiptonReduction]: Number of co-enabled transitions 88 [2021-03-24 13:29:29,649 INFO L154 LiptonReduction]: Checked pairs total: 142 [2021-03-24 13:29:29,649 INFO L156 LiptonReduction]: Total number of compositions: 3 [2021-03-24 13:29:29,650 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 62 [2021-03-24 13:29:29,652 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 13:29:29,652 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:29:29,652 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:29,652 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:29:29,653 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:29,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:29,653 INFO L82 PathProgramCache]: Analyzing trace with hash 2522016, now seen corresponding path program 1 times [2021-03-24 13:29:29,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:29,654 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094051521] [2021-03-24 13:29:29,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:29,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:29:29,674 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:29,679 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:29,683 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:29,683 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:29,689 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 13:29:29,690 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094051521] [2021-03-24 13:29:29,690 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:29:29,691 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-24 13:29:29,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61897248] [2021-03-24 13:29:29,691 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:29:29,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:29:29,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:29:29,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:29:29,697 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 18 [2021-03-24 13:29:29,698 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 17 places, 12 transitions, 36 flow. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 0 states have call successors, (0), 0 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 13:29:29,698 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:29:29,698 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 18 [2021-03-24 13:29:29,698 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:29:29,757 INFO L129 PetriNetUnfolder]: 7/29 cut-off events. [2021-03-24 13:29:29,757 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 13:29:29,762 INFO L84 FinitePrefix]: Finished finitePrefix Result has 61 conditions, 29 events. 7/29 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 6. Compared 57 event pairs, 2 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 42. Up to 17 conditions per place. [2021-03-24 13:29:29,762 INFO L132 encePairwiseOnDemand]: 13/18 looper letters, 6 selfloop transitions, 5 changer transitions 0/16 dead transitions. [2021-03-24 13:29:29,762 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 20 places, 16 transitions, 66 flow [2021-03-24 13:29:29,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:29:29,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:29:29,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 45 transitions. [2021-03-24 13:29:29,764 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.625 [2021-03-24 13:29:29,764 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 45 transitions. [2021-03-24 13:29:29,764 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 45 transitions. [2021-03-24 13:29:29,764 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:29:29,764 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 45 transitions. [2021-03-24 13:29:29,765 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 0 states have call successors, (0), 0 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 13:29:29,766 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 18.0) internal successors, (90), 5 states have internal predecessors, (90), 0 states have call successors, (0), 0 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 13:29:29,766 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 18.0) internal successors, (90), 5 states have internal predecessors, (90), 0 states have call successors, (0), 0 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 13:29:29,766 INFO L185 Difference]: Start difference. First operand has 17 places, 12 transitions, 36 flow. Second operand 4 states and 45 transitions. [2021-03-24 13:29:29,766 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 20 places, 16 transitions, 66 flow [2021-03-24 13:29:29,767 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 16 transitions, 64 flow, removed 1 selfloop flow, removed 0 redundant places. [2021-03-24 13:29:29,768 INFO L241 Difference]: Finished difference. Result has 21 places, 14 transitions, 56 flow [2021-03-24 13:29:29,768 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=18, PETRI_DIFFERENCE_MINUEND_FLOW=34, PETRI_DIFFERENCE_MINUEND_PLACES=17, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=56, PETRI_PLACES=21, PETRI_TRANSITIONS=14} [2021-03-24 13:29:29,768 INFO L343 CegarLoopForPetriNet]: 17 programPoint places, 4 predicate places. [2021-03-24 13:29:29,768 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 14 transitions, 56 flow [2021-03-24 13:29:29,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 0 states have call successors, (0), 0 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 13:29:29,769 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:29,769 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2021-03-24 13:29:29,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-24 13:29:29,769 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:29,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:29,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1871568349, now seen corresponding path program 1 times [2021-03-24 13:29:29,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:29,770 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336954584] [2021-03-24 13:29:29,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:29,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:29:29,775 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:29:29,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:29:29,791 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:29:29,792 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:29:29,792 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:29:29,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-24 13:29:29,793 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:29:29,793 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-24 13:29:29,810 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:29:29,811 INFO L253 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-03-24 13:29:29,812 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:29:29,812 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:29:29,812 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:29:29,812 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:29:29,812 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:29:29,812 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:29:29,812 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:29:29,813 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:29:29,814 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 13:29:29,817 INFO L129 PetriNetUnfolder]: 0/25 cut-off events. [2021-03-24 13:29:29,818 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-24 13:29:29,818 INFO L84 FinitePrefix]: Finished finitePrefix Result has 41 conditions, 25 events. 0/25 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 38 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-24 13:29:29,818 INFO L82 GeneralOperation]: Start removeDead. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 13:29:29,818 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 27 places, 20 transitions, 61 flow [2021-03-24 13:29:29,819 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:29:29,819 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 27 places, 20 transitions, 61 flow [2021-03-24 13:29:29,819 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 27 places, 20 transitions, 61 flow [2021-03-24 13:29:29,821 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 13:29:29,832 INFO L129 PetriNetUnfolder]: 0/25 cut-off events. [2021-03-24 13:29:29,833 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-24 13:29:29,833 INFO L84 FinitePrefix]: Finished finitePrefix Result has 41 conditions, 25 events. 0/25 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 42 event pairs, 0 based on Foata normal form. 0/22 useless extension candidates. Maximal degree in co-relation 0. Up to 4 conditions per place. [2021-03-24 13:29:29,834 INFO L142 LiptonReduction]: Number of co-enabled transitions 192 [2021-03-24 13:29:29,879 INFO L154 LiptonReduction]: Checked pairs total: 310 [2021-03-24 13:29:29,879 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 13:29:29,880 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 61 [2021-03-24 13:29:29,886 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 13:29:29,886 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:29:29,886 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:29,886 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:29:29,887 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:29,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:29,888 INFO L82 PathProgramCache]: Analyzing trace with hash 3472476, now seen corresponding path program 1 times [2021-03-24 13:29:29,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:29,888 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042595996] [2021-03-24 13:29:29,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:29,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:29:29,910 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:29,910 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:29,913 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:29,914 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:29,919 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 13:29:29,920 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042595996] [2021-03-24 13:29:29,920 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:29:29,920 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-24 13:29:29,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074433054] [2021-03-24 13:29:29,921 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:29:29,921 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:29:29,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:29:29,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:29:29,923 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 24 [2021-03-24 13:29:29,924 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 23 places, 16 transitions, 53 flow. Second operand has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 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 13:29:29,924 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:29:29,924 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 24 [2021-03-24 13:29:29,924 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:29:30,002 INFO L129 PetriNetUnfolder]: 75/147 cut-off events. [2021-03-24 13:29:30,002 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-24 13:29:30,004 INFO L84 FinitePrefix]: Finished finitePrefix Result has 300 conditions, 147 events. 75/147 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 20. Compared 512 event pairs, 33 based on Foata normal form. 0/100 useless extension candidates. Maximal degree in co-relation 272. Up to 130 conditions per place. [2021-03-24 13:29:30,007 INFO L132 encePairwiseOnDemand]: 17/24 looper letters, 12 selfloop transitions, 7 changer transitions 0/25 dead transitions. [2021-03-24 13:29:30,007 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 25 transitions, 109 flow [2021-03-24 13:29:30,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:29:30,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:29:30,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 62 transitions. [2021-03-24 13:29:30,011 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6458333333333334 [2021-03-24 13:29:30,013 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 62 transitions. [2021-03-24 13:29:30,013 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 62 transitions. [2021-03-24 13:29:30,013 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:29:30,014 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 62 transitions. [2021-03-24 13:29:30,016 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 15.5) internal successors, (62), 4 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 13:29:30,017 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 24.0) internal successors, (120), 5 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 13:29:30,017 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 24.0) internal successors, (120), 5 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 13:29:30,017 INFO L185 Difference]: Start difference. First operand has 23 places, 16 transitions, 53 flow. Second operand 4 states and 62 transitions. [2021-03-24 13:29:30,017 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 25 transitions, 109 flow [2021-03-24 13:29:30,018 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 26 places, 25 transitions, 103 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-03-24 13:29:30,019 INFO L241 Difference]: Finished difference. Result has 27 places, 22 transitions, 91 flow [2021-03-24 13:29:30,019 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=24, PETRI_DIFFERENCE_MINUEND_FLOW=47, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=91, PETRI_PLACES=27, PETRI_TRANSITIONS=22} [2021-03-24 13:29:30,019 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 4 predicate places. [2021-03-24 13:29:30,019 INFO L480 AbstractCegarLoop]: Abstraction has has 27 places, 22 transitions, 91 flow [2021-03-24 13:29:30,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 10.75) internal successors, (43), 4 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 13:29:30,019 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:30,019 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:29:30,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-24 13:29:30,020 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:30,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:30,020 INFO L82 PathProgramCache]: Analyzing trace with hash 368858181, now seen corresponding path program 1 times [2021-03-24 13:29:30,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:30,021 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471587019] [2021-03-24 13:29:30,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:30,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:29:30,046 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,046 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,049 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,050 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,056 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,056 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,061 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:29:30,062 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471587019] [2021-03-24 13:29:30,062 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514372397] [2021-03-24 13:29:30,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-03-24 13:29:30,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:29:30,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 17 conjuncts, 4 conjunts are in the unsatisfiable core [2021-03-24 13:29:30,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-03-24 13:29:30,093 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,093 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,094 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,094 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,095 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,095 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,095 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,096 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,096 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,097 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,097 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,097 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,098 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,098 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,099 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,099 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,105 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:29:30,117 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,118 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:29:30,118 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-03-24 13:29:30,119 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:29:30,121 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,122 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:29:30,124 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-03-24 13:29:30,125 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,164 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,165 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,172 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,173 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,173 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,173 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,174 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,174 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,174 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,175 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,175 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,176 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,176 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,176 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,177 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,177 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,177 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,178 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,178 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,181 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:29:30,183 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,184 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:29:30,184 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-03-24 13:29:30,185 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-03-24 13:29:30,186 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,187 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-24 13:29:30,196 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-03-24 13:29:30,198 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,200 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,201 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,204 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:29:30,204 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-03-24 13:29:30,204 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-03-24 13:29:30,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017923061] [2021-03-24 13:29:30,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-24 13:29:30,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:29:30,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-24 13:29:30,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-03-24 13:29:30,206 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 24 [2021-03-24 13:29:30,206 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 22 transitions, 91 flow. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 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 13:29:30,206 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:29:30,206 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 24 [2021-03-24 13:29:30,206 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:29:30,271 INFO L129 PetriNetUnfolder]: 48/123 cut-off events. [2021-03-24 13:29:30,271 INFO L130 PetriNetUnfolder]: For 49/59 co-relation queries the response was YES. [2021-03-24 13:29:30,272 INFO L84 FinitePrefix]: Finished finitePrefix Result has 318 conditions, 123 events. 48/123 cut-off events. For 49/59 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 492 event pairs, 11 based on Foata normal form. 31/152 useless extension candidates. Maximal degree in co-relation 298. Up to 66 conditions per place. [2021-03-24 13:29:30,273 INFO L132 encePairwiseOnDemand]: 14/24 looper letters, 9 selfloop transitions, 13 changer transitions 0/28 dead transitions. [2021-03-24 13:29:30,273 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 31 places, 28 transitions, 147 flow [2021-03-24 13:29:30,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-24 13:29:30,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-24 13:29:30,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 75 transitions. [2021-03-24 13:29:30,278 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.625 [2021-03-24 13:29:30,278 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 75 transitions. [2021-03-24 13:29:30,278 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 75 transitions. [2021-03-24 13:29:30,278 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:29:30,279 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 75 transitions. [2021-03-24 13:29:30,283 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 15.0) internal successors, (75), 5 states have internal predecessors, (75), 0 states have call successors, (0), 0 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 13:29:30,285 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 24.0) internal successors, (144), 6 states have internal predecessors, (144), 0 states have call successors, (0), 0 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 13:29:30,285 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 24.0) internal successors, (144), 6 states have internal predecessors, (144), 0 states have call successors, (0), 0 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 13:29:30,285 INFO L185 Difference]: Start difference. First operand has 27 places, 22 transitions, 91 flow. Second operand 5 states and 75 transitions. [2021-03-24 13:29:30,285 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 31 places, 28 transitions, 147 flow [2021-03-24 13:29:30,287 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 31 places, 28 transitions, 147 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-24 13:29:30,288 INFO L241 Difference]: Finished difference. Result has 33 places, 25 transitions, 151 flow [2021-03-24 13:29:30,288 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=24, PETRI_DIFFERENCE_MINUEND_FLOW=91, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=22, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=10, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=151, PETRI_PLACES=33, PETRI_TRANSITIONS=25} [2021-03-24 13:29:30,288 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 10 predicate places. [2021-03-24 13:29:30,288 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 25 transitions, 151 flow [2021-03-24 13:29:30,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 0 states have call successors, (0), 0 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 13:29:30,289 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:30,289 INFO L263 CegarLoopForPetriNet]: trace histogram [3, 1, 1, 1, 1, 1] [2021-03-24 13:29:30,510 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-03-24 13:29:30,510 INFO L428 AbstractCegarLoop]: === Iteration 3 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:30,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:30,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1916423873, now seen corresponding path program 1 times [2021-03-24 13:29:30,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:30,511 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846795176] [2021-03-24 13:29:30,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:30,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:29:30,516 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:29:30,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:29:30,520 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:29:30,521 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:29:30,521 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:29:30,521 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-24 13:29:30,522 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:29:30,522 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-24 13:29:30,532 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 13:29:30,532 INFO L253 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-03-24 13:29:30,533 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:29:30,533 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:29:30,533 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:29:30,533 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:29:30,533 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:29:30,533 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:29:30,533 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:29:30,533 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:29:30,534 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 13:29:30,536 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-24 13:29:30,536 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-03-24 13:29:30,537 INFO L84 FinitePrefix]: Finished finitePrefix Result has 55 conditions, 32 events. 0/32 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 60 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-24 13:29:30,537 INFO L82 GeneralOperation]: Start removeDead. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 13:29:30,537 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 25 transitions, 82 flow [2021-03-24 13:29:30,537 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:29:30,537 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 25 transitions, 82 flow [2021-03-24 13:29:30,537 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 25 transitions, 82 flow [2021-03-24 13:29:30,538 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 13:29:30,540 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-24 13:29:30,540 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-03-24 13:29:30,540 INFO L84 FinitePrefix]: Finished finitePrefix Result has 55 conditions, 32 events. 0/32 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 5. Compared 68 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 0. Up to 5 conditions per place. [2021-03-24 13:29:30,540 INFO L142 LiptonReduction]: Number of co-enabled transitions 336 [2021-03-24 13:29:30,578 INFO L154 LiptonReduction]: Checked pairs total: 580 [2021-03-24 13:29:30,578 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-24 13:29:30,578 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 41 [2021-03-24 13:29:30,579 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 13:29:30,580 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:29:30,580 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:30,580 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 13:29:30,580 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:30,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:30,580 INFO L82 PathProgramCache]: Analyzing trace with hash 4428382, now seen corresponding path program 1 times [2021-03-24 13:29:30,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:30,581 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1779505158] [2021-03-24 13:29:30,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:30,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:29:30,588 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,588 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,590 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,591 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,593 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 13:29:30,594 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1779505158] [2021-03-24 13:29:30,594 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:29:30,594 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-24 13:29:30,594 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264097524] [2021-03-24 13:29:30,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:29:30,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:29:30,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:29:30,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:29:30,595 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 30 [2021-03-24 13:29:30,595 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 20 transitions, 72 flow. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 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 13:29:30,595 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:29:30,595 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 30 [2021-03-24 13:29:30,596 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:29:30,695 INFO L129 PetriNetUnfolder]: 501/767 cut-off events. [2021-03-24 13:29:30,696 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-03-24 13:29:30,698 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1544 conditions, 767 events. 501/767 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 73. Compared 3245 event pairs, 282 based on Foata normal form. 0/499 useless extension candidates. Maximal degree in co-relation 1506. Up to 745 conditions per place. [2021-03-24 13:29:30,703 INFO L132 encePairwiseOnDemand]: 21/30 looper letters, 16 selfloop transitions, 9 changer transitions 0/32 dead transitions. [2021-03-24 13:29:30,703 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 32 places, 32 transitions, 146 flow [2021-03-24 13:29:30,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:29:30,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:29:30,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 77 transitions. [2021-03-24 13:29:30,705 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6416666666666667 [2021-03-24 13:29:30,705 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 77 transitions. [2021-03-24 13:29:30,705 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 77 transitions. [2021-03-24 13:29:30,705 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:29:30,705 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 77 transitions. [2021-03-24 13:29:30,706 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 19.25) internal successors, (77), 4 states have internal predecessors, (77), 0 states have call successors, (0), 0 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 13:29:30,706 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 30.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:29:30,707 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 30.0) internal successors, (150), 5 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:29:30,707 INFO L185 Difference]: Start difference. First operand has 29 places, 20 transitions, 72 flow. Second operand 4 states and 77 transitions. [2021-03-24 13:29:30,707 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 32 places, 32 transitions, 146 flow [2021-03-24 13:29:30,708 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 32 transitions, 134 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-03-24 13:29:30,708 INFO L241 Difference]: Finished difference. Result has 33 places, 28 transitions, 118 flow [2021-03-24 13:29:30,708 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=60, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=118, PETRI_PLACES=33, PETRI_TRANSITIONS=28} [2021-03-24 13:29:30,709 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 4 predicate places. [2021-03-24 13:29:30,709 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 28 transitions, 118 flow [2021-03-24 13:29:30,709 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 0 states have call successors, (0), 0 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 13:29:30,709 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:30,709 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:29:30,709 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-24 13:29:30,709 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:30,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:30,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1225770782, now seen corresponding path program 1 times [2021-03-24 13:29:30,710 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:30,710 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041549022] [2021-03-24 13:29:30,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:30,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:29:30,719 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,719 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,722 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,722 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,725 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:29:30,726 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:29:30,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-24 13:29:30,730 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041549022] [2021-03-24 13:29:30,730 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:29:30,730 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:29:30,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905896881] [2021-03-24 13:29:30,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-24 13:29:30,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:29:30,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-24 13:29:30,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-03-24 13:29:30,731 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 30 [2021-03-24 13:29:30,731 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 28 transitions, 118 flow. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 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 13:29:30,731 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:29:30,732 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 30 [2021-03-24 13:29:30,732 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:29:30,860 INFO L129 PetriNetUnfolder]: 495/867 cut-off events. [2021-03-24 13:29:30,861 INFO L130 PetriNetUnfolder]: For 401/523 co-relation queries the response was YES. [2021-03-24 13:29:30,863 INFO L84 FinitePrefix]: Finished finitePrefix Result has 2237 conditions, 867 events. 495/867 cut-off events. For 401/523 co-relation queries the response was YES. Maximal size of possible extension queue 112. Compared 4625 event pairs, 136 based on Foata normal form. 174/1030 useless extension candidates. Maximal degree in co-relation 2216. Up to 445 conditions per place. [2021-03-24 13:29:30,868 INFO L132 encePairwiseOnDemand]: 17/30 looper letters, 16 selfloop transitions, 17 changer transitions 0/40 dead transitions. [2021-03-24 13:29:30,869 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 40 transitions, 216 flow [2021-03-24 13:29:30,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-24 13:29:30,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-24 13:29:30,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 97 transitions. [2021-03-24 13:29:30,871 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6466666666666666 [2021-03-24 13:29:30,871 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 97 transitions. [2021-03-24 13:29:30,871 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 97 transitions. [2021-03-24 13:29:30,871 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:29:30,871 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 97 transitions. [2021-03-24 13:29:30,871 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 0 states have call successors, (0), 0 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 13:29:30,873 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 30.0) internal successors, (180), 6 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 13:29:30,874 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 30.0) internal successors, (180), 6 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 13:29:30,874 INFO L185 Difference]: Start difference. First operand has 33 places, 28 transitions, 118 flow. Second operand 5 states and 97 transitions. [2021-03-24 13:29:30,874 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 40 transitions, 216 flow [2021-03-24 13:29:30,877 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 40 transitions, 216 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-24 13:29:30,878 INFO L241 Difference]: Finished difference. Result has 39 places, 36 transitions, 221 flow [2021-03-24 13:29:30,878 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=30, PETRI_DIFFERENCE_MINUEND_FLOW=118, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=221, PETRI_PLACES=39, PETRI_TRANSITIONS=36} [2021-03-24 13:29:30,878 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 10 predicate places. [2021-03-24 13:29:30,878 INFO L480 AbstractCegarLoop]: Abstraction has has 39 places, 36 transitions, 221 flow [2021-03-24 13:29:30,878 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 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 13:29:30,878 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:29:30,879 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:29:30,879 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-24 13:29:30,879 INFO L428 AbstractCegarLoop]: === Iteration 3 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:29:30,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:29:30,879 INFO L82 PathProgramCache]: Analyzing trace with hash -1369158855, now seen corresponding path program 1 times [2021-03-24 13:29:30,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:29:30,879 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476382401] [2021-03-24 13:29:30,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:29:30,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:29:30,893 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:29:30,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:29:30,904 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:29:30,909 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:29:30,909 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:29:30,909 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-24 13:29:30,922 INFO L202 PluginConnector]: Adding new model ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.03 01:29:30 BasicIcfg [2021-03-24 13:29:30,922 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-24 13:29:30,923 INFO L168 Benchmark]: Toolchain (without parser) took 2054.61 ms. Allocated memory is still 348.1 MB. Free memory was 328.3 MB in the beginning and 232.1 MB in the end (delta: 96.2 MB). Peak memory consumption was 97.5 MB. Max. memory is 16.0 GB. [2021-03-24 13:29:30,925 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 348.1 MB. Free memory was 329.3 MB in the beginning and 329.3 MB in the end (delta: 75.2 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 13:29:30,927 INFO L168 Benchmark]: Boogie Procedure Inliner took 26.46 ms. Allocated memory is still 348.1 MB. Free memory was 328.2 MB in the beginning and 326.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-24 13:29:30,928 INFO L168 Benchmark]: Boogie Preprocessor took 14.28 ms. Allocated memory is still 348.1 MB. Free memory was 326.8 MB in the beginning and 325.9 MB in the end (delta: 913.1 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 13:29:30,928 INFO L168 Benchmark]: RCFGBuilder took 192.42 ms. Allocated memory is still 348.1 MB. Free memory was 325.8 MB in the beginning and 317.4 MB in the end (delta: 8.4 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.0 GB. [2021-03-24 13:29:30,928 INFO L168 Benchmark]: TraceAbstraction took 1815.10 ms. Allocated memory is still 348.1 MB. Free memory was 316.9 MB in the beginning and 232.1 MB in the end (delta: 84.8 MB). Peak memory consumption was 84.9 MB. Max. memory is 16.0 GB. [2021-03-24 13:29:30,929 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 348.1 MB. Free memory was 329.3 MB in the beginning and 329.3 MB in the end (delta: 75.2 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 26.46 ms. Allocated memory is still 348.1 MB. Free memory was 328.2 MB in the beginning and 326.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 14.28 ms. Allocated memory is still 348.1 MB. Free memory was 326.8 MB in the beginning and 325.9 MB in the end (delta: 913.1 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 192.42 ms. Allocated memory is still 348.1 MB. Free memory was 325.8 MB in the beginning and 317.4 MB in the end (delta: 8.4 MB). Peak memory consumption was 6.3 MB. Max. memory is 16.0 GB. * TraceAbstraction took 1815.10 ms. Allocated memory is still 348.1 MB. Free memory was 316.9 MB in the beginning and 232.1 MB in the end (delta: 84.8 MB). Peak memory consumption was 84.9 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 107.1ms, 13 PlacesBefore, 10 PlacesAfterwards, 10 TransitionsBefore, 7 TransitionsAfterwards, 24 CoEnabledTransitionPairs, 3 FixpointIterations, 1 TrivialSequentialCompositions, 3 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 4 TotalNumberOfCompositions, 9 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 9, positive: 9, positive conditional: 0, positive unconditional: 9, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 6, positive: 6, positive conditional: 0, positive unconditional: 6, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 6, positive: 6, positive conditional: 0, positive unconditional: 6, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 9, positive: 3, positive conditional: 0, positive unconditional: 3, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 6, unknown conditional: 0, unknown unconditional: 6] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 60.3ms, 20 PlacesBefore, 17 PlacesAfterwards, 15 TransitionsBefore, 12 TransitionsAfterwards, 88 CoEnabledTransitionPairs, 2 FixpointIterations, 1 TrivialSequentialCompositions, 2 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 3 TotalNumberOfCompositions, 142 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 58, positive: 40, positive conditional: 0, positive unconditional: 40, negative: 18, negative conditional: 0, negative unconditional: 18, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 29, positive: 22, positive conditional: 0, positive unconditional: 22, negative: 7, negative conditional: 0, negative unconditional: 7, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 29, positive: 22, positive conditional: 0, positive unconditional: 22, negative: 7, negative conditional: 0, negative unconditional: 7, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 58, positive: 18, positive conditional: 0, positive unconditional: 18, negative: 11, negative conditional: 0, negative unconditional: 11, unknown: 29, unknown conditional: 0, unknown unconditional: 29] , Statistics on independence cache: Total cache size (in pairs): 13, Positive cache size: 8, Positive conditional cache size: 0, Positive unconditional cache size: 8, Negative cache size: 5, Negative conditional cache size: 0, Negative unconditional cache size: 5 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 60.5ms, 27 PlacesBefore, 23 PlacesAfterwards, 20 TransitionsBefore, 16 TransitionsAfterwards, 192 CoEnabledTransitionPairs, 2 FixpointIterations, 1 TrivialSequentialCompositions, 3 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 4 TotalNumberOfCompositions, 310 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 154, positive: 129, positive conditional: 0, positive unconditional: 129, negative: 25, negative conditional: 0, negative unconditional: 25, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 88, positive: 77, positive conditional: 0, positive unconditional: 77, negative: 11, negative conditional: 0, negative unconditional: 11, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 88, positive: 77, positive conditional: 0, positive unconditional: 77, negative: 11, negative conditional: 0, negative unconditional: 11, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 154, positive: 52, positive conditional: 0, positive unconditional: 52, negative: 14, negative conditional: 0, negative unconditional: 14, unknown: 88, unknown conditional: 0, unknown unconditional: 88] , Statistics on independence cache: Total cache size (in pairs): 40, Positive cache size: 33, Positive conditional cache size: 0, Positive unconditional cache size: 33, Negative cache size: 7, Negative conditional cache size: 0, Negative unconditional cache size: 7 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 40.5ms, 34 PlacesBefore, 29 PlacesAfterwards, 25 TransitionsBefore, 20 TransitionsAfterwards, 336 CoEnabledTransitionPairs, 2 FixpointIterations, 1 TrivialSequentialCompositions, 4 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 5 TotalNumberOfCompositions, 580 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 128, positive: 94, positive conditional: 0, positive unconditional: 94, negative: 34, negative conditional: 0, negative unconditional: 34, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 90, positive: 73, positive conditional: 0, positive unconditional: 73, negative: 17, negative conditional: 0, negative unconditional: 17, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 90, positive: 73, positive conditional: 0, positive unconditional: 73, negative: 17, negative conditional: 0, negative unconditional: 17, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 128, positive: 21, positive conditional: 0, positive unconditional: 21, negative: 17, negative conditional: 0, negative unconditional: 17, unknown: 90, unknown conditional: 0, unknown unconditional: 90] , Statistics on independence cache: Total cache size (in pairs): 25, Positive cache size: 12, Positive conditional cache size: 0, Positive unconditional cache size: 12, Negative cache size: 13, Negative conditional cache size: 0, Negative unconditional cache size: 13 - CounterExampleResult [Line: 31]: assertion can be violated assertion can be violated We found a FailurePath: [L17] 0 newid := 0; [L18] 0 n := 0; VAL [n=0, newid=0] [L21] FORK 0 fork newid foo(); VAL [n=0, newid=0] [L22] 0 newid := newid + 1; VAL [n=0, newid=1] [L21] FORK 0 fork newid foo(); VAL [n=0, newid=1] [L22] 0 newid := newid + 1; VAL [n=0, newid=2] [L21] FORK 0 fork newid foo(); VAL [n=0, newid=2] [L30] 1 n := n + 1; VAL [n=1, newid=2] [L30] 2 n := n + 1; VAL [n=2, newid=2] [L30] 3 n := n + 1; VAL [n=3, newid=2] [L31] 3 assert n <= 2; VAL [n=3, newid=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 10 locations, 1 error locations. Started 4 CEGAR loops. EmptinessCheckTime: 10.3ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 1678.3ms, OverallIterations: 10, TraceHistogramMax: 3, EmptinessCheckTime: 0.0ms, AutomataDifference: 555.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 339.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 24 SDtfs, 27 SDslu, 0 SDs, 0 SdLazy, 146 SolverSat, 43 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 142.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=221occurred in iteration=2, InterpolantAutomatonStates: 25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 12.7ms SsaConstructionTime, 60.5ms SatisfiabilityAnalysisTime, 258.6ms InterpolantComputationTime, 64 NumberOfCodeBlocks, 64 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 29 ConstructedInterpolants, 0 QuantifiedInterpolants, 87 SizeOfPredicates, 0 NumberOfNonLiveVariables, 17 ConjunctsInSsa, 4 ConjunctsInUnsatCore, 7 InterpolantComputations, 5 PerfectInterpolantSequences, 1/3 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...