/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-SemanticLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/ForkInLoop02-Incrementer.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-24 22:19:54,285 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-24 22:19:54,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-24 22:19:54,314 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-24 22:19:54,357 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-SemanticLbe.epf [2021-03-24 22:19:54,379 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-24 22:19:54,379 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-24 22:19:54,380 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-24 22:19:54,380 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-24 22:19:54,380 INFO L138 SettingsManager]: * Use SBE=true [2021-03-24 22:19:54,381 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-24 22:19:54,381 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-24 22:19:54,381 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-24 22:19:54,381 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-24 22:19:54,381 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-24 22:19:54,381 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-24 22:19:54,381 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-24 22:19:54,382 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-24 22:19:54,382 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-24 22:19:54,382 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-24 22:19:54,382 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-24 22:19:54,382 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-24 22:19:54,382 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-24 22:19:54,382 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-24 22:19:54,383 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-24 22:19:54,383 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-24 22:19:54,383 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 22:19:54,383 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-24 22:19:54,383 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-24 22:19:54,383 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-24 22:19:54,383 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-24 22:19:54,384 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-24 22:19:54,384 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-24 22:19:54,384 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-24 22:19:54,689 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-24 22:19:54,709 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-24 22:19:54,711 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-24 22:19:54,712 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-24 22:19:54,713 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-24 22:19:54,714 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/ForkInLoop02-Incrementer.bpl [2021-03-24 22:19:54,714 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/ForkInLoop02-Incrementer.bpl' [2021-03-24 22:19:54,737 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-24 22:19:54,739 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-24 22:19:54,741 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-24 22:19:54,741 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-24 22:19:54,741 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-24 22:19:54,750 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,755 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,761 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-24 22:19:54,762 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-24 22:19:54,763 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-24 22:19:54,763 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-24 22:19:54,770 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,770 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,770 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,771 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,772 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,774 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,774 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 10:19:54" (1/1) ... [2021-03-24 22:19:54,775 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-24 22:19:54,776 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-24 22:19:54,776 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-24 22:19:54,777 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-24 22:19:54,778 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:19:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 22:19:54,845 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2021-03-24 22:19:54,845 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-03-24 22:19:54,846 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-03-24 22:19:54,846 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-24 22:19:54,846 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-24 22:19:54,846 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-24 22:19:54,940 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-24 22:19:54,941 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-03-24 22:19:54,942 INFO L202 PluginConnector]: Adding new model ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 10:19:54 BoogieIcfgContainer [2021-03-24 22:19:54,942 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-24 22:19:54,943 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-24 22:19:54,943 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-24 22:19:54,965 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-24 22:19:54,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 10:19:54" (1/2) ... [2021-03-24 22:19:54,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@474a88af and model type ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.03 10:19:54, skipping insertion in model container [2021-03-24 22:19:54,966 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 10:19:54" (2/2) ... [2021-03-24 22:19:54,968 INFO L111 eAbstractionObserver]: Analyzing ICFG ForkInLoop02-Incrementer.bpl [2021-03-24 22:19:54,972 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-24 22:19:54,975 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-24 22:19:54,975 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-24 22:19:54,997 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:19:55,009 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-24 22:19:55,025 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:19:55,025 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:19:55,025 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:19:55,025 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:19:55,025 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:19:55,025 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:19:55,025 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:19:55,025 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:19:55,033 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 22:19:55,047 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 22:19:55,048 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:19:55,049 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 22:19:55,049 INFO L82 GeneralOperation]: Start removeDead. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 22:19:55,052 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 13 places, 10 transitions, 25 flow [2021-03-24 22:19:55,053 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:19:55,064 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 13 places, 10 transitions, 25 flow [2021-03-24 22:19:55,067 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 13 places, 10 transitions, 25 flow [2021-03-24 22:19:55,068 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 10 transitions, 25 flow [2021-03-24 22:19:55,071 INFO L129 PetriNetUnfolder]: 0/11 cut-off events. [2021-03-24 22:19:55,071 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:19:55,071 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 22:19:55,073 INFO L142 LiptonReduction]: Number of co-enabled transitions 24 [2021-03-24 22:19:55,168 INFO L154 LiptonReduction]: Checked pairs total: 9 [2021-03-24 22:19:55,168 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 22:19:55,170 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 118 [2021-03-24 22:19:55,176 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-24 22:19:55,176 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:19:55,177 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:55,177 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1] [2021-03-24 22:19:55,177 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:55,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:55,182 INFO L82 PathProgramCache]: Analyzing trace with hash 59487, now seen corresponding path program 1 times [2021-03-24 22:19:55,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:55,189 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918769428] [2021-03-24 22:19:55,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:55,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:19:55,353 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:55,354 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:55,360 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 22:19:55,361 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918769428] [2021-03-24 22:19:55,361 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:19:55,361 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-03-24 22:19:55,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190210341] [2021-03-24 22:19:55,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:19:55,369 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:19:55,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:19:55,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:19:55,383 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 14 [2021-03-24 22:19:55,384 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 22:19:55,384 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:19:55,385 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 14 [2021-03-24 22:19:55,385 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:19:55,409 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 22:19:55,410 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-24 22:19:55,410 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 22:19:55,411 INFO L132 encePairwiseOnDemand]: 11/14 looper letters, 0 selfloop transitions, 2 changer transitions 1/6 dead transitions. [2021-03-24 22:19:55,411 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 11 places, 6 transitions, 21 flow [2021-03-24 22:19:55,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:19:55,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:19:55,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 21 transitions. [2021-03-24 22:19:55,420 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5 [2021-03-24 22:19:55,421 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 21 transitions. [2021-03-24 22:19:55,421 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 21 transitions. [2021-03-24 22:19:55,422 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:19:55,424 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 21 transitions. [2021-03-24 22:19:55,425 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 22:19:55,434 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 22:19:55,435 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 22:19:55,437 INFO L185 Difference]: Start difference. First operand has 10 places, 7 transitions, 19 flow. Second operand 3 states and 21 transitions. [2021-03-24 22:19:55,438 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 11 places, 6 transitions, 21 flow [2021-03-24 22:19:55,440 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 22:19:55,442 INFO L241 Difference]: Finished difference. Result has 11 places, 5 transitions, 19 flow [2021-03-24 22:19:55,443 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 22:19:55,444 INFO L343 CegarLoopForPetriNet]: 10 programPoint places, 1 predicate places. [2021-03-24 22:19:55,444 INFO L480 AbstractCegarLoop]: Abstraction has has 11 places, 5 transitions, 19 flow [2021-03-24 22:19:55,444 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 22:19:55,444 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:55,444 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 22:19:55,445 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-24 22:19:55,445 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:55,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:55,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1843627, now seen corresponding path program 1 times [2021-03-24 22:19:55,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:55,447 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149910386] [2021-03-24 22:19:55,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:55,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:19:55,460 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:19:55,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:19:55,471 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:19:55,482 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:19:55,482 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:19:55,483 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-24 22:19:55,484 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:19:55,484 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-24 22:19:55,499 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:19:55,499 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-24 22:19:55,504 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:19:55,504 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:19:55,504 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:19:55,504 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:19:55,504 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:19:55,504 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:19:55,505 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:19:55,505 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:19:55,506 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 22:19:55,513 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-24 22:19:55,514 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 22:19:55,514 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 22:19:55,514 INFO L82 GeneralOperation]: Start removeDead. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 22:19:55,515 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 20 places, 15 transitions, 42 flow [2021-03-24 22:19:55,515 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:19:55,515 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 20 places, 15 transitions, 42 flow [2021-03-24 22:19:55,516 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 20 places, 15 transitions, 42 flow [2021-03-24 22:19:55,517 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 15 transitions, 42 flow [2021-03-24 22:19:55,530 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-24 22:19:55,531 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 22:19:55,532 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 22:19:55,533 INFO L142 LiptonReduction]: Number of co-enabled transitions 88 [2021-03-24 22:19:55,681 INFO L154 LiptonReduction]: Checked pairs total: 121 [2021-03-24 22:19:55,681 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-24 22:19:55,682 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 167 [2021-03-24 22:19:55,687 INFO L129 PetriNetUnfolder]: 0/7 cut-off events. [2021-03-24 22:19:55,688 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 22:19:55,688 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:55,688 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 22:19:55,688 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:55,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:55,689 INFO L82 PathProgramCache]: Analyzing trace with hash 2522016, now seen corresponding path program 1 times [2021-03-24 22:19:55,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:55,691 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101109825] [2021-03-24 22:19:55,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:55,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:19:55,711 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:55,715 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:55,724 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:55,725 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:55,729 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 22:19:55,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101109825] [2021-03-24 22:19:55,729 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:19:55,730 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-24 22:19:55,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575803043] [2021-03-24 22:19:55,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 22:19:55,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:19:55,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 22:19:55,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 22:19:55,732 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 20 [2021-03-24 22:19:55,733 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 22:19:55,733 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:19:55,733 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 20 [2021-03-24 22:19:55,733 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:19:55,771 INFO L129 PetriNetUnfolder]: 5/27 cut-off events. [2021-03-24 22:19:55,772 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 22:19:55,775 INFO L84 FinitePrefix]: Finished finitePrefix Result has 57 conditions, 27 events. 5/27 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 8. Compared 55 event pairs, 1 based on Foata normal form. 2/22 useless extension candidates. Maximal degree in co-relation 38. Up to 15 conditions per place. [2021-03-24 22:19:55,776 INFO L132 encePairwiseOnDemand]: 13/20 looper letters, 2 selfloop transitions, 9 changer transitions 0/16 dead transitions. [2021-03-24 22:19:55,776 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 20 places, 16 transitions, 66 flow [2021-03-24 22:19:55,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 22:19:55,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 22:19:55,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 45 transitions. [2021-03-24 22:19:55,778 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5625 [2021-03-24 22:19:55,779 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 45 transitions. [2021-03-24 22:19:55,779 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 45 transitions. [2021-03-24 22:19:55,779 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:19:55,779 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 45 transitions. [2021-03-24 22:19:55,781 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 22:19:55,784 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 20.0) internal successors, (100), 5 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:55,784 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 20.0) internal successors, (100), 5 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:55,784 INFO L185 Difference]: Start difference. First operand has 17 places, 12 transitions, 36 flow. Second operand 4 states and 45 transitions. [2021-03-24 22:19:55,784 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 20 places, 16 transitions, 66 flow [2021-03-24 22:19:55,787 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 22:19:55,788 INFO L241 Difference]: Finished difference. Result has 21 places, 16 transitions, 72 flow [2021-03-24 22:19:55,788 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=20, PETRI_DIFFERENCE_MINUEND_FLOW=34, PETRI_DIFFERENCE_MINUEND_PLACES=17, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=7, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=72, PETRI_PLACES=21, PETRI_TRANSITIONS=16} [2021-03-24 22:19:55,789 INFO L343 CegarLoopForPetriNet]: 17 programPoint places, 4 predicate places. [2021-03-24 22:19:55,789 INFO L480 AbstractCegarLoop]: Abstraction has has 21 places, 16 transitions, 72 flow [2021-03-24 22:19:55,789 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 22:19:55,789 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:55,789 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2021-03-24 22:19:55,789 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-24 22:19:55,790 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:55,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:55,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1871568349, now seen corresponding path program 1 times [2021-03-24 22:19:55,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:55,791 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777353323] [2021-03-24 22:19:55,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:55,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:19:55,797 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:19:55,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:19:55,812 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:19:55,816 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:19:55,816 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:19:55,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-24 22:19:55,816 WARN L342 ceAbstractionStarter]: 2 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:19:55,817 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 3 thread instances. [2021-03-24 22:19:55,828 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:19:55,828 INFO L253 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2021-03-24 22:19:55,829 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:19:55,830 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:19:55,830 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:19:55,830 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:19:55,832 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:19:55,832 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:19:55,832 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:19:55,832 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:19:55,835 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 22:19:55,846 INFO L129 PetriNetUnfolder]: 0/25 cut-off events. [2021-03-24 22:19:55,846 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-24 22:19:55,846 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 22:19:55,846 INFO L82 GeneralOperation]: Start removeDead. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 22:19:55,847 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 27 places, 20 transitions, 61 flow [2021-03-24 22:19:55,848 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:19:55,848 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 27 places, 20 transitions, 61 flow [2021-03-24 22:19:55,848 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 27 places, 20 transitions, 61 flow [2021-03-24 22:19:55,849 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 20 transitions, 61 flow [2021-03-24 22:19:55,857 INFO L129 PetriNetUnfolder]: 0/25 cut-off events. [2021-03-24 22:19:55,857 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-24 22:19:55,857 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 5. Compared 50 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 22:19:55,858 INFO L142 LiptonReduction]: Number of co-enabled transitions 192 [2021-03-24 22:19:56,009 INFO L154 LiptonReduction]: Checked pairs total: 293 [2021-03-24 22:19:56,009 INFO L156 LiptonReduction]: Total number of compositions: 7 [2021-03-24 22:19:56,010 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 162 [2021-03-24 22:19:56,014 INFO L129 PetriNetUnfolder]: 0/8 cut-off events. [2021-03-24 22:19:56,015 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 22:19:56,015 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:56,015 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 22:19:56,015 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:56,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:56,015 INFO L82 PathProgramCache]: Analyzing trace with hash 3534044, now seen corresponding path program 1 times [2021-03-24 22:19:56,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:56,016 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236769681] [2021-03-24 22:19:56,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:56,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:19:56,031 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,031 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,034 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,035 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 22:19:56,039 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236769681] [2021-03-24 22:19:56,039 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:19:56,039 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-24 22:19:56,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735132881] [2021-03-24 22:19:56,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 22:19:56,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:19:56,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 22:19:56,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 22:19:56,041 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 27 [2021-03-24 22:19:56,043 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 22:19:56,043 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:19:56,043 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 27 [2021-03-24 22:19:56,043 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:19:56,105 INFO L129 PetriNetUnfolder]: 69/141 cut-off events. [2021-03-24 22:19:56,105 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-03-24 22:19:56,107 INFO L84 FinitePrefix]: Finished finitePrefix Result has 288 conditions, 141 events. 69/141 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 27. Compared 545 event pairs, 21 based on Foata normal form. 3/98 useless extension candidates. Maximal degree in co-relation 260. Up to 124 conditions per place. [2021-03-24 22:19:56,108 INFO L132 encePairwiseOnDemand]: 17/27 looper letters, 9 selfloop transitions, 13 changer transitions 0/28 dead transitions. [2021-03-24 22:19:56,108 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 26 places, 28 transitions, 121 flow [2021-03-24 22:19:56,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 22:19:56,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 22:19:56,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 65 transitions. [2021-03-24 22:19:56,110 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6018518518518519 [2021-03-24 22:19:56,110 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 65 transitions. [2021-03-24 22:19:56,110 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 65 transitions. [2021-03-24 22:19:56,110 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:19:56,110 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 65 transitions. [2021-03-24 22:19:56,111 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,112 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,112 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,112 INFO L185 Difference]: Start difference. First operand has 23 places, 16 transitions, 53 flow. Second operand 4 states and 65 transitions. [2021-03-24 22:19:56,112 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 26 places, 28 transitions, 121 flow [2021-03-24 22:19:56,113 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 26 places, 28 transitions, 115 flow, removed 3 selfloop flow, removed 0 redundant places. [2021-03-24 22:19:56,113 INFO L241 Difference]: Finished difference. Result has 27 places, 28 transitions, 127 flow [2021-03-24 22:19:56,113 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=47, PETRI_DIFFERENCE_MINUEND_PLACES=23, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=16, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=7, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=127, PETRI_PLACES=27, PETRI_TRANSITIONS=28} [2021-03-24 22:19:56,114 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 4 predicate places. [2021-03-24 22:19:56,114 INFO L480 AbstractCegarLoop]: Abstraction has has 27 places, 28 transitions, 127 flow [2021-03-24 22:19:56,114 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 22:19:56,114 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:56,114 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:19:56,114 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-24 22:19:56,114 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:56,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:56,115 INFO L82 PathProgramCache]: Analyzing trace with hash -2106954643, now seen corresponding path program 1 times [2021-03-24 22:19:56,115 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:56,115 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1262427805] [2021-03-24 22:19:56,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:56,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:19:56,125 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,125 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 22:19:56,127 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,127 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,130 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 22:19:56,133 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1262427805] [2021-03-24 22:19:56,133 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:19:56,133 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-24 22:19:56,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426553990] [2021-03-24 22:19:56,133 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-24 22:19:56,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:19:56,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-24 22:19:56,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-24 22:19:56,136 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 27 [2021-03-24 22:19:56,137 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 27 places, 28 transitions, 127 flow. Second operand has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,137 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:19:56,137 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 27 [2021-03-24 22:19:56,137 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:19:56,190 INFO L129 PetriNetUnfolder]: 57/153 cut-off events. [2021-03-24 22:19:56,190 INFO L130 PetriNetUnfolder]: For 60/174 co-relation queries the response was YES. [2021-03-24 22:19:56,192 INFO L84 FinitePrefix]: Finished finitePrefix Result has 477 conditions, 153 events. 57/153 cut-off events. For 60/174 co-relation queries the response was YES. Maximal size of possible extension queue 34. Compared 737 event pairs, 15 based on Foata normal form. 23/124 useless extension candidates. Maximal degree in co-relation 457. Up to 94 conditions per place. [2021-03-24 22:19:56,193 INFO L132 encePairwiseOnDemand]: 17/27 looper letters, 18 selfloop transitions, 16 changer transitions 0/40 dead transitions. [2021-03-24 22:19:56,194 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 40 transitions, 249 flow [2021-03-24 22:19:56,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-24 22:19:56,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-24 22:19:56,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 49 transitions. [2021-03-24 22:19:56,195 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6049382716049383 [2021-03-24 22:19:56,196 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 49 transitions. [2021-03-24 22:19:56,196 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 49 transitions. [2021-03-24 22:19:56,196 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:19:56,196 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 49 transitions. [2021-03-24 22:19:56,198 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 16.333333333333332) internal successors, (49), 3 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,199 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,199 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 27.0) internal successors, (108), 4 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,199 INFO L185 Difference]: Start difference. First operand has 27 places, 28 transitions, 127 flow. Second operand 3 states and 49 transitions. [2021-03-24 22:19:56,199 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 40 transitions, 249 flow [2021-03-24 22:19:56,201 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 40 transitions, 249 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-24 22:19:56,202 INFO L241 Difference]: Finished difference. Result has 31 places, 40 transitions, 275 flow [2021-03-24 22:19:56,202 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=127, PETRI_DIFFERENCE_MINUEND_PLACES=27, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=28, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=12, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=275, PETRI_PLACES=31, PETRI_TRANSITIONS=40} [2021-03-24 22:19:56,202 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 8 predicate places. [2021-03-24 22:19:56,202 INFO L480 AbstractCegarLoop]: Abstraction has has 31 places, 40 transitions, 275 flow [2021-03-24 22:19:56,203 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,203 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:56,203 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:19:56,203 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-03-24 22:19:56,203 INFO L428 AbstractCegarLoop]: === Iteration 3 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:56,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:56,204 INFO L82 PathProgramCache]: Analyzing trace with hash -2106941817, now seen corresponding path program 1 times [2021-03-24 22:19:56,204 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:56,204 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972015480] [2021-03-24 22:19:56,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:56,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:19:56,214 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,215 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,217 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,217 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,221 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,221 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,236 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 22:19:56,236 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972015480] [2021-03-24 22:19:56,237 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:19:56,237 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 22:19:56,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157318139] [2021-03-24 22:19:56,237 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-24 22:19:56,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:19:56,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-24 22:19:56,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-03-24 22:19:56,238 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 10 out of 27 [2021-03-24 22:19:56,238 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 31 places, 40 transitions, 275 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 22:19:56,238 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:19:56,238 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 10 of 27 [2021-03-24 22:19:56,239 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:19:56,302 INFO L129 PetriNetUnfolder]: 36/105 cut-off events. [2021-03-24 22:19:56,302 INFO L130 PetriNetUnfolder]: For 172/407 co-relation queries the response was YES. [2021-03-24 22:19:56,303 INFO L84 FinitePrefix]: Finished finitePrefix Result has 460 conditions, 105 events. 36/105 cut-off events. For 172/407 co-relation queries the response was YES. Maximal size of possible extension queue 22. Compared 431 event pairs, 8 based on Foata normal form. 38/139 useless extension candidates. Maximal degree in co-relation 436. Up to 61 conditions per place. [2021-03-24 22:19:56,305 INFO L132 encePairwiseOnDemand]: 17/27 looper letters, 9 selfloop transitions, 25 changer transitions 0/40 dead transitions. [2021-03-24 22:19:56,305 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 35 places, 40 transitions, 343 flow [2021-03-24 22:19:56,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-24 22:19:56,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-24 22:19:56,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 75 transitions. [2021-03-24 22:19:56,312 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5555555555555556 [2021-03-24 22:19:56,312 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 75 transitions. [2021-03-24 22:19:56,312 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 75 transitions. [2021-03-24 22:19:56,312 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:19:56,313 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 75 transitions. [2021-03-24 22:19:56,314 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 22:19:56,315 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 27.0) internal successors, (162), 6 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,315 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 27.0) internal successors, (162), 6 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,315 INFO L185 Difference]: Start difference. First operand has 31 places, 40 transitions, 275 flow. Second operand 5 states and 75 transitions. [2021-03-24 22:19:56,315 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 35 places, 40 transitions, 343 flow [2021-03-24 22:19:56,323 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 33 places, 40 transitions, 311 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-24 22:19:56,324 INFO L241 Difference]: Finished difference. Result has 34 places, 40 transitions, 317 flow [2021-03-24 22:19:56,324 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=27, PETRI_DIFFERENCE_MINUEND_FLOW=243, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=40, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=25, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=317, PETRI_PLACES=34, PETRI_TRANSITIONS=40} [2021-03-24 22:19:56,325 INFO L343 CegarLoopForPetriNet]: 23 programPoint places, 11 predicate places. [2021-03-24 22:19:56,325 INFO L480 AbstractCegarLoop]: Abstraction has has 34 places, 40 transitions, 317 flow [2021-03-24 22:19:56,325 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 22:19:56,325 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:56,325 INFO L263 CegarLoopForPetriNet]: trace histogram [3, 1, 1, 1, 1, 1] [2021-03-24 22:19:56,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-03-24 22:19:56,326 INFO L428 AbstractCegarLoop]: === Iteration 4 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:56,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:56,326 INFO L82 PathProgramCache]: Analyzing trace with hash -891596225, now seen corresponding path program 1 times [2021-03-24 22:19:56,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:56,331 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933598435] [2021-03-24 22:19:56,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:56,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:19:56,344 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:19:56,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:19:56,347 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:19:56,348 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:19:56,348 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:19:56,348 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-03-24 22:19:56,349 WARN L342 ceAbstractionStarter]: 3 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 22:19:56,349 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 4 thread instances. [2021-03-24 22:19:56,365 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-03-24 22:19:56,366 INFO L253 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-03-24 22:19:56,367 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 22:19:56,367 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 22:19:56,367 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 22:19:56,367 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 22:19:56,367 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 22:19:56,367 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 22:19:56,367 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 22:19:56,367 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 22:19:56,368 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 22:19:56,370 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-24 22:19:56,370 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-03-24 22:19:56,371 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 22:19:56,371 INFO L82 GeneralOperation]: Start removeDead. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 22:19:56,371 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 34 places, 25 transitions, 82 flow [2021-03-24 22:19:56,371 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-24 22:19:56,371 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 34 places, 25 transitions, 82 flow [2021-03-24 22:19:56,372 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 34 places, 25 transitions, 82 flow [2021-03-24 22:19:56,372 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 34 places, 25 transitions, 82 flow [2021-03-24 22:19:56,377 INFO L129 PetriNetUnfolder]: 0/32 cut-off events. [2021-03-24 22:19:56,377 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-03-24 22:19:56,377 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 62 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 22:19:56,377 INFO L142 LiptonReduction]: Number of co-enabled transitions 336 [2021-03-24 22:19:56,567 INFO L154 LiptonReduction]: Checked pairs total: 523 [2021-03-24 22:19:56,567 INFO L156 LiptonReduction]: Total number of compositions: 9 [2021-03-24 22:19:56,568 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 197 [2021-03-24 22:19:56,569 INFO L129 PetriNetUnfolder]: 0/6 cut-off events. [2021-03-24 22:19:56,569 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 22:19:56,569 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:56,569 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1] [2021-03-24 22:19:56,569 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:56,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:56,570 INFO L82 PathProgramCache]: Analyzing trace with hash 4582302, now seen corresponding path program 1 times [2021-03-24 22:19:56,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:56,570 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622878794] [2021-03-24 22:19:56,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:56,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:19:56,577 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,577 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,579 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,580 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 22:19:56,583 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622878794] [2021-03-24 22:19:56,583 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:19:56,583 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-24 22:19:56,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383385790] [2021-03-24 22:19:56,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 22:19:56,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:19:56,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 22:19:56,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 22:19:56,584 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 34 [2021-03-24 22:19:56,584 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 22:19:56,584 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:19:56,584 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 34 [2021-03-24 22:19:56,584 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:19:56,671 INFO L129 PetriNetUnfolder]: 489/755 cut-off events. [2021-03-24 22:19:56,671 INFO L130 PetriNetUnfolder]: For 16/16 co-relation queries the response was YES. [2021-03-24 22:19:56,674 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1520 conditions, 755 events. 489/755 cut-off events. For 16/16 co-relation queries the response was YES. Maximal size of possible extension queue 112. Compared 3559 event pairs, 213 based on Foata normal form. 4/491 useless extension candidates. Maximal degree in co-relation 1482. Up to 733 conditions per place. [2021-03-24 22:19:56,680 INFO L132 encePairwiseOnDemand]: 21/34 looper letters, 12 selfloop transitions, 17 changer transitions 0/36 dead transitions. [2021-03-24 22:19:56,680 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 32 places, 36 transitions, 162 flow [2021-03-24 22:19:56,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 22:19:56,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 22:19:56,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 81 transitions. [2021-03-24 22:19:56,681 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5955882352941176 [2021-03-24 22:19:56,681 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 81 transitions. [2021-03-24 22:19:56,681 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 81 transitions. [2021-03-24 22:19:56,682 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:19:56,682 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 81 transitions. [2021-03-24 22:19:56,682 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,683 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 34.0) internal successors, (170), 5 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,683 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 34.0) internal successors, (170), 5 states have internal predecessors, (170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,683 INFO L185 Difference]: Start difference. First operand has 29 places, 20 transitions, 72 flow. Second operand 4 states and 81 transitions. [2021-03-24 22:19:56,683 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 32 places, 36 transitions, 162 flow [2021-03-24 22:19:56,684 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 36 transitions, 150 flow, removed 6 selfloop flow, removed 0 redundant places. [2021-03-24 22:19:56,685 INFO L241 Difference]: Finished difference. Result has 33 places, 36 transitions, 166 flow [2021-03-24 22:19:56,685 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=34, PETRI_DIFFERENCE_MINUEND_FLOW=60, PETRI_DIFFERENCE_MINUEND_PLACES=29, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=9, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=166, PETRI_PLACES=33, PETRI_TRANSITIONS=36} [2021-03-24 22:19:56,685 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 4 predicate places. [2021-03-24 22:19:56,685 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 36 transitions, 166 flow [2021-03-24 22:19:56,685 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 22:19:56,685 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:56,686 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:19:56,686 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-03-24 22:19:56,686 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:56,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:56,686 INFO L82 PathProgramCache]: Analyzing trace with hash -935274520, now seen corresponding path program 1 times [2021-03-24 22:19:56,686 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:56,687 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130227281] [2021-03-24 22:19:56,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:56,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 22:19:56,727 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,727 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,730 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,731 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,734 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 22:19:56,734 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 22:19:56,739 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 22:19:56,740 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130227281] [2021-03-24 22:19:56,740 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 22:19:56,740 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 22:19:56,740 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759576886] [2021-03-24 22:19:56,740 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-24 22:19:56,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 22:19:56,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-24 22:19:56,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-03-24 22:19:56,743 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 34 [2021-03-24 22:19:56,744 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 36 transitions, 166 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 22:19:56,744 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 22:19:56,744 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 34 [2021-03-24 22:19:56,744 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 22:19:56,854 INFO L129 PetriNetUnfolder]: 323/647 cut-off events. [2021-03-24 22:19:56,854 INFO L130 PetriNetUnfolder]: For 276/720 co-relation queries the response was YES. [2021-03-24 22:19:56,856 INFO L84 FinitePrefix]: Finished finitePrefix Result has 1981 conditions, 647 events. 323/647 cut-off events. For 276/720 co-relation queries the response was YES. Maximal size of possible extension queue 108. Compared 3796 event pairs, 93 based on Foata normal form. 150/570 useless extension candidates. Maximal degree in co-relation 1960. Up to 409 conditions per place. [2021-03-24 22:19:56,862 INFO L132 encePairwiseOnDemand]: 21/34 looper letters, 12 selfloop transitions, 25 changer transitions 0/44 dead transitions. [2021-03-24 22:19:56,863 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 37 places, 44 transitions, 272 flow [2021-03-24 22:19:56,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-24 22:19:56,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-24 22:19:56,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 101 transitions. [2021-03-24 22:19:56,864 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5941176470588235 [2021-03-24 22:19:56,864 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 101 transitions. [2021-03-24 22:19:56,864 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 101 transitions. [2021-03-24 22:19:56,865 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 22:19:56,865 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 101 transitions. [2021-03-24 22:19:56,865 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 20.2) internal successors, (101), 5 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,866 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 34.0) internal successors, (204), 6 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,867 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 34.0) internal successors, (204), 6 states have internal predecessors, (204), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 22:19:56,867 INFO L185 Difference]: Start difference. First operand has 33 places, 36 transitions, 166 flow. Second operand 5 states and 101 transitions. [2021-03-24 22:19:56,867 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 37 places, 44 transitions, 272 flow [2021-03-24 22:19:56,868 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 37 places, 44 transitions, 272 flow, removed 0 selfloop flow, removed 0 redundant places. [2021-03-24 22:19:56,869 INFO L241 Difference]: Finished difference. Result has 39 places, 44 transitions, 297 flow [2021-03-24 22:19:56,869 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=34, PETRI_DIFFERENCE_MINUEND_FLOW=166, PETRI_DIFFERENCE_MINUEND_PLACES=33, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=36, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=17, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=297, PETRI_PLACES=39, PETRI_TRANSITIONS=44} [2021-03-24 22:19:56,869 INFO L343 CegarLoopForPetriNet]: 29 programPoint places, 10 predicate places. [2021-03-24 22:19:56,870 INFO L480 AbstractCegarLoop]: Abstraction has has 39 places, 44 transitions, 297 flow [2021-03-24 22:19:56,870 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 22:19:56,870 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 22:19:56,870 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 22:19:56,870 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-03-24 22:19:56,870 INFO L428 AbstractCegarLoop]: === Iteration 3 === [fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, ULTIMATE.startErr0INUSE_VIOLATION, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT, fooErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 22:19:56,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 22:19:56,871 INFO L82 PathProgramCache]: Analyzing trace with hash 2004207068, now seen corresponding path program 1 times [2021-03-24 22:19:56,871 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 22:19:56,871 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159291694] [2021-03-24 22:19:56,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 22:19:56,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:19:56,878 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:19:56,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 22:19:56,882 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 22:19:56,883 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 22:19:56,884 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 22:19:56,884 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-03-24 22:19:56,894 INFO L202 PluginConnector]: Adding new model ForkInLoop02-Incrementer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.03 10:19:56 BasicIcfg [2021-03-24 22:19:56,895 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-24 22:19:56,896 INFO L168 Benchmark]: Toolchain (without parser) took 2156.76 ms. Allocated memory was 255.9 MB in the beginning and 343.9 MB in the end (delta: 88.1 MB). Free memory was 236.7 MB in the beginning and 293.4 MB in the end (delta: -56.7 MB). Peak memory consumption was 29.6 MB. Max. memory is 16.0 GB. [2021-03-24 22:19:56,896 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 255.9 MB. Free memory was 237.8 MB in the beginning and 237.7 MB in the end (delta: 165.6 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 22:19:56,896 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.50 ms. Allocated memory is still 255.9 MB. Free memory was 236.7 MB in the beginning and 235.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-24 22:19:56,897 INFO L168 Benchmark]: Boogie Preprocessor took 13.19 ms. Allocated memory is still 255.9 MB. Free memory was 235.2 MB in the beginning and 234.3 MB in the end (delta: 917.1 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 22:19:56,897 INFO L168 Benchmark]: RCFGBuilder took 165.84 ms. Allocated memory is still 255.9 MB. Free memory was 234.3 MB in the beginning and 226.1 MB in the end (delta: 8.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. [2021-03-24 22:19:56,897 INFO L168 Benchmark]: TraceAbstraction took 1951.48 ms. Allocated memory was 255.9 MB in the beginning and 343.9 MB in the end (delta: 88.1 MB). Free memory was 225.8 MB in the beginning and 293.4 MB in the end (delta: -67.6 MB). Peak memory consumption was 19.1 MB. Max. memory is 16.0 GB. [2021-03-24 22:19:56,898 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 255.9 MB. Free memory was 237.8 MB in the beginning and 237.7 MB in the end (delta: 165.6 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 20.50 ms. Allocated memory is still 255.9 MB. Free memory was 236.7 MB in the beginning and 235.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 13.19 ms. Allocated memory is still 255.9 MB. Free memory was 235.2 MB in the beginning and 234.3 MB in the end (delta: 917.1 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 165.84 ms. Allocated memory is still 255.9 MB. Free memory was 234.3 MB in the beginning and 226.1 MB in the end (delta: 8.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. * TraceAbstraction took 1951.48 ms. Allocated memory was 255.9 MB in the beginning and 343.9 MB in the end (delta: 88.1 MB). Free memory was 225.8 MB in the beginning and 293.4 MB in the end (delta: -67.6 MB). Peak memory consumption was 19.1 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 101.0ms, 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: UnionIndependenceRelation.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] , UnionIndependenceRelation.Statistics on underlying relations: [ 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] , SemanticIndependenceRelation.Independence Queries: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 0, positive: 0, positive conditional: 0, positive unconditional: 0, 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: 165.5ms, 20 PlacesBefore, 17 PlacesAfterwards, 15 TransitionsBefore, 12 TransitionsAfterwards, 88 CoEnabledTransitionPairs, 3 FixpointIterations, 3 TrivialSequentialCompositions, 2 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 5 TotalNumberOfCompositions, 121 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 85, positive: 71, positive conditional: 0, positive unconditional: 71, negative: 14, negative conditional: 0, negative unconditional: 14, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 40, positive: 38, positive conditional: 0, positive unconditional: 38, negative: 2, negative conditional: 0, negative unconditional: 2, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 40, positive: 38, positive conditional: 0, positive unconditional: 38, negative: 2, negative conditional: 0, negative unconditional: 2, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.Independence Queries: [ total: 40, positive: 34, positive conditional: 0, positive unconditional: 34, negative: 6, negative conditional: 0, negative unconditional: 6, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 6, positive: 4, positive conditional: 0, positive unconditional: 4, negative: 2, negative conditional: 0, negative unconditional: 2, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 33, positive: 26, positive conditional: 0, positive unconditional: 26, negative: 7, negative conditional: 0, negative unconditional: 7, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 85, positive: 33, positive conditional: 0, positive unconditional: 33, negative: 12, negative conditional: 0, negative unconditional: 12, unknown: 40, unknown conditional: 0, unknown unconditional: 40] , Statistics on independence cache: Total cache size (in pairs): 13, Positive cache size: 11, Positive conditional cache size: 0, Positive unconditional cache size: 11, Negative cache size: 2, Negative conditional cache size: 0, Negative unconditional cache size: 2 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 161.0ms, 27 PlacesBefore, 23 PlacesAfterwards, 20 TransitionsBefore, 16 TransitionsAfterwards, 192 CoEnabledTransitionPairs, 3 FixpointIterations, 3 TrivialSequentialCompositions, 4 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 7 TotalNumberOfCompositions, 293 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 138, positive: 116, positive conditional: 0, positive unconditional: 116, negative: 22, negative conditional: 0, negative unconditional: 22, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 92, positive: 86, positive conditional: 0, positive unconditional: 86, negative: 6, negative conditional: 0, negative unconditional: 6, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 92, positive: 86, positive conditional: 0, positive unconditional: 86, negative: 6, negative conditional: 0, negative unconditional: 6, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.Independence Queries: [ total: 92, positive: 78, positive conditional: 0, positive unconditional: 78, negative: 14, negative conditional: 0, negative unconditional: 14, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 14, positive: 8, positive conditional: 0, positive unconditional: 8, negative: 6, negative conditional: 0, negative unconditional: 6, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 40, positive: 23, positive conditional: 0, positive unconditional: 23, negative: 17, negative conditional: 0, negative unconditional: 17, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 138, positive: 30, positive conditional: 0, positive unconditional: 30, negative: 16, negative conditional: 0, negative unconditional: 16, unknown: 92, unknown conditional: 0, unknown unconditional: 92] , Statistics on independence cache: Total cache size (in pairs): 16, Positive cache size: 11, Positive conditional cache size: 0, Positive unconditional cache size: 11, Negative cache size: 5, Negative conditional cache size: 0, Negative unconditional cache size: 5 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 195.7ms, 34 PlacesBefore, 29 PlacesAfterwards, 25 TransitionsBefore, 20 TransitionsAfterwards, 336 CoEnabledTransitionPairs, 3 FixpointIterations, 4 TrivialSequentialCompositions, 5 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 9 TotalNumberOfCompositions, 523 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 210, positive: 181, positive conditional: 0, positive unconditional: 181, negative: 29, negative conditional: 0, negative unconditional: 29, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 158, positive: 148, positive conditional: 0, positive unconditional: 148, negative: 10, negative conditional: 0, negative unconditional: 10, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 158, positive: 148, positive conditional: 0, positive unconditional: 148, negative: 10, negative conditional: 0, negative unconditional: 10, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.Independence Queries: [ total: 158, positive: 135, positive conditional: 0, positive unconditional: 135, negative: 23, negative conditional: 0, negative unconditional: 23, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 23, positive: 13, positive conditional: 0, positive unconditional: 13, negative: 10, negative conditional: 0, negative unconditional: 10, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 56, positive: 31, positive conditional: 0, positive unconditional: 31, negative: 25, negative conditional: 0, negative unconditional: 25, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 210, positive: 33, positive conditional: 0, positive unconditional: 33, negative: 19, negative conditional: 0, negative unconditional: 19, unknown: 158, unknown conditional: 0, unknown unconditional: 158] , Statistics on independence cache: Total cache size (in pairs): 24, Positive cache size: 15, Positive conditional cache size: 0, Positive unconditional cache size: 15, Negative cache size: 9, Negative conditional cache size: 0, Negative unconditional cache size: 9 - 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] [L30] 1 n := n + 1; [L31] 1 assert n <= 2; [L22] 0 newid := newid + 1; VAL [n=1, newid=1] [L21] FORK 0 fork newid foo(); VAL [n=1, newid=1] [L30] 2 n := n + 1; [L31] 2 assert n <= 2; [L22] 0 newid := newid + 1; VAL [n=2, newid=2] [L21] FORK 0 fork newid foo(); 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: 10.8ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 1813.3ms, OverallIterations: 11, TraceHistogramMax: 3, EmptinessCheckTime: 0.0ms, AutomataDifference: 583.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 707.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 34 SDtfs, 0 SDslu, 0 SDs, 0 SdLazy, 171 SolverSat, 78 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 140.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=317occurred in iteration=3, InterpolantAutomatonStates: 28, 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: 9.8ms SsaConstructionTime, 58.7ms SatisfiabilityAnalysisTime, 188.2ms InterpolantComputationTime, 64 NumberOfCodeBlocks, 64 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 29 ConstructedInterpolants, 0 QuantifiedInterpolants, 77 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 7 PerfectInterpolantSequences, 3/3 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...