/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/example_epsilon_write.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-7cd14b8b9f04096d8ddfd3d9cd8a4ac590fe5404-7cd14b8 [2021-03-11 22:33:28,676 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-11 22:33:28,678 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-11 22:33:28,701 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-11 22:33:28,735 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 [2021-03-11 22:33:28,765 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-11 22:33:28,765 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-11 22:33:28,769 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-11 22:33:28,769 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-11 22:33:28,769 INFO L138 SettingsManager]: * Use SBE=true [2021-03-11 22:33:28,769 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-11 22:33:28,769 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-11 22:33:28,769 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-11 22:33:28,770 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-11 22:33:28,770 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-11 22:33:28,770 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-11 22:33:28,770 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-11 22:33:28,771 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-11 22:33:28,771 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-11 22:33:28,771 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-11 22:33:28,771 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-11 22:33:28,771 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-11 22:33:28,771 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-11 22:33:28,771 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-11 22:33:28,772 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-11 22:33:28,772 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-11 22:33:28,772 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-11 22:33:28,772 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-11 22:33:28,772 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-11 22:33:28,772 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-11 22:33:28,772 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-11 22:33:28,773 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-11 22:33:28,773 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-11 22:33:28,773 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-11 22:33:29,057 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-11 22:33:29,086 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-11 22:33:29,090 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-11 22:33:29,091 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-11 22:33:29,092 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-11 22:33:29,093 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/example_epsilon_write.bpl [2021-03-11 22:33:29,093 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/example_epsilon_write.bpl' [2021-03-11 22:33:29,138 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-11 22:33:29,143 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-11 22:33:29,144 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-11 22:33:29,144 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-11 22:33:29,144 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-11 22:33:29,155 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,161 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,167 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-11 22:33:29,171 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-11 22:33:29,172 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-11 22:33:29,172 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-11 22:33:29,179 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,179 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,179 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,180 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,181 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,182 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,182 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... [2021-03-11 22:33:29,183 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-11 22:33:29,183 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-11 22:33:29,184 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-11 22:33:29,184 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-11 22:33:29,185 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-11 22:33:29,240 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-11 22:33:29,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-11 22:33:29,241 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-11 22:33:29,242 INFO L124 BoogieDeclarations]: Specification and implementation of procedure set_x given in one single declaration [2021-03-11 22:33:29,242 INFO L130 BoogieDeclarations]: Found specification of procedure set_x [2021-03-11 22:33:29,242 INFO L138 BoogieDeclarations]: Found implementation of procedure set_x [2021-03-11 22:33:29,243 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-11 22:33:29,368 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-11 22:33:29,368 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-11 22:33:29,369 INFO L202 PluginConnector]: Adding new model example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 10:33:29 BoogieIcfgContainer [2021-03-11 22:33:29,370 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-11 22:33:29,372 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-11 22:33:29,372 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-11 22:33:29,374 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-11 22:33:29,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 10:33:29" (1/2) ... [2021-03-11 22:33:29,376 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14280c92 and model type example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.03 10:33:29, skipping insertion in model container [2021-03-11 22:33:29,376 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 10:33:29" (2/2) ... [2021-03-11 22:33:29,377 INFO L111 eAbstractionObserver]: Analyzing ICFG example_epsilon_write.bpl [2021-03-11 22:33:29,384 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-11 22:33:29,387 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-11 22:33:29,388 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-11 22:33:29,425 INFO L149 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2021-03-11 22:33:29,442 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 22:33:29,473 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 22:33:29,473 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 22:33:29,473 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 22:33:29,473 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 22:33:29,473 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 22:33:29,474 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 22:33:29,474 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 22:33:29,474 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 22:33:29,481 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 13 places, 9 transitions, 26 flow [2021-03-11 22:33:29,494 INFO L129 PetriNetUnfolder]: 0/8 cut-off events. [2021-03-11 22:33:29,494 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-11 22:33:29,496 INFO L84 FinitePrefix]: Finished finitePrefix Result has 13 conditions, 8 events. 0/8 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 3 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. [2021-03-11 22:33:29,496 INFO L82 GeneralOperation]: Start removeDead. Operand has 13 places, 9 transitions, 26 flow [2021-03-11 22:33:29,498 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 10 places, 6 transitions, 18 flow [2021-03-11 22:33:29,501 INFO L118 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-11 22:33:29,509 INFO L133 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 10 places, 6 transitions, 18 flow [2021-03-11 22:33:29,511 INFO L110 LiptonReduction]: Starting Lipton reduction on Petri net that has 10 places, 6 transitions, 18 flow [2021-03-11 22:33:29,512 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 10 places, 6 transitions, 18 flow [2021-03-11 22:33:29,514 INFO L129 PetriNetUnfolder]: 0/6 cut-off events. [2021-03-11 22:33:29,514 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-11 22:33:29,515 INFO L84 FinitePrefix]: Finished finitePrefix Result has 11 conditions, 6 events. 0/6 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 0/6 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-11 22:33:29,515 INFO L116 LiptonReduction]: Number of co-enabled transitions 4 [2021-03-11 22:33:29,546 INFO L131 LiptonReduction]: Checked pairs total: 6 [2021-03-11 22:33:29,547 INFO L133 LiptonReduction]: Total number of compositions: 1 [2021-03-11 22:33:29,548 INFO L182 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 49 [2021-03-11 22:33:29,555 INFO L129 PetriNetUnfolder]: 0/4 cut-off events. [2021-03-11 22:33:29,555 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-11 22:33:29,555 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 22:33:29,556 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-03-11 22:33:29,556 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 22:33:29,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 22:33:29,560 INFO L82 PathProgramCache]: Analyzing trace with hash 46812865, now seen corresponding path program 1 times [2021-03-11 22:33:29,567 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 22:33:29,568 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929650791] [2021-03-11 22:33:29,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 22:33:29,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 22:33:29,649 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 22:33:29,650 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 22:33:29,651 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 22:33:29,652 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 22:33:29,659 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 22:33:29,660 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 22:33:29,661 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 22:33:29,662 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929650791] [2021-03-11 22:33:29,662 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 22:33:29,662 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-11 22:33:29,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397801714] [2021-03-11 22:33:29,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 22:33:29,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 22:33:29,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 22:33:29,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 22:33:29,681 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 10 [2021-03-11 22:33:29,682 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 9 places, 5 transitions, 16 flow. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,682 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 22:33:29,682 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 10 [2021-03-11 22:33:29,683 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 22:33:29,694 INFO L129 PetriNetUnfolder]: 0/6 cut-off events. [2021-03-11 22:33:29,694 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-11 22:33:29,694 INFO L84 FinitePrefix]: Finished finitePrefix Result has 16 conditions, 6 events. 0/6 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 1/7 useless extension candidates. Maximal degree in co-relation 0. Up to 3 conditions per place. [2021-03-11 22:33:29,695 INFO L132 encePairwiseOnDemand]: 8/10 looper letters, 2 selfloop transitions, 1 changer transitions 0/5 dead transitions. [2021-03-11 22:33:29,695 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 11 places, 5 transitions, 22 flow [2021-03-11 22:33:29,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 22:33:29,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 22:33:29,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 19 transitions. [2021-03-11 22:33:29,704 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.6333333333333333 [2021-03-11 22:33:29,704 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 19 transitions. [2021-03-11 22:33:29,705 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 19 transitions. [2021-03-11 22:33:29,705 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 22:33:29,707 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 19 transitions. [2021-03-11 22:33:29,708 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,710 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,711 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,712 INFO L185 Difference]: Start difference. First operand has 9 places, 5 transitions, 16 flow. Second operand 3 states and 19 transitions. [2021-03-11 22:33:29,713 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 11 places, 5 transitions, 22 flow [2021-03-11 22:33:29,714 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 9 places, 5 transitions, 18 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-11 22:33:29,715 INFO L241 Difference]: Finished difference. Result has 10 places, 5 transitions, 17 flow [2021-03-11 22:33:29,717 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=10, PETRI_DIFFERENCE_MINUEND_FLOW=12, PETRI_DIFFERENCE_MINUEND_PLACES=7, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=5, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=4, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=17, PETRI_PLACES=10, PETRI_TRANSITIONS=5} [2021-03-11 22:33:29,717 INFO L335 CegarLoopForPetriNet]: 9 programPoint places, 1 predicate places. [2021-03-11 22:33:29,718 INFO L480 AbstractCegarLoop]: Abstraction has has 10 places, 5 transitions, 17 flow [2021-03-11 22:33:29,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,718 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 22:33:29,718 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1] [2021-03-11 22:33:29,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-11 22:33:29,718 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 22:33:29,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 22:33:29,719 INFO L82 PathProgramCache]: Analyzing trace with hash 46524565, now seen corresponding path program 2 times [2021-03-11 22:33:29,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 22:33:29,719 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917481281] [2021-03-11 22:33:29,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 22:33:29,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 22:33:29,727 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 22:33:29,727 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 22:33:29,728 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 22:33:29,728 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 22:33:29,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 22:33:29,733 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917481281] [2021-03-11 22:33:29,733 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 22:33:29,733 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-11 22:33:29,733 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307702710] [2021-03-11 22:33:29,734 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 22:33:29,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 22:33:29,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 22:33:29,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 22:33:29,736 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 5 out of 10 [2021-03-11 22:33:29,736 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 10 places, 5 transitions, 17 flow. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,736 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 22:33:29,736 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 5 of 10 [2021-03-11 22:33:29,736 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 22:33:29,739 INFO L129 PetriNetUnfolder]: 0/5 cut-off events. [2021-03-11 22:33:29,739 INFO L130 PetriNetUnfolder]: For 5/5 co-relation queries the response was YES. [2021-03-11 22:33:29,739 INFO L84 FinitePrefix]: Finished finitePrefix Result has 16 conditions, 5 events. 0/5 cut-off events. For 5/5 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 1 event pairs, 0 based on Foata normal form. 1/6 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-11 22:33:29,740 INFO L132 encePairwiseOnDemand]: 8/10 looper letters, 0 selfloop transitions, 0 changer transitions 4/4 dead transitions. [2021-03-11 22:33:29,740 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 11 places, 4 transitions, 19 flow [2021-03-11 22:33:29,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 22:33:29,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 22:33:29,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 18 transitions. [2021-03-11 22:33:29,744 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.6 [2021-03-11 22:33:29,744 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 18 transitions. [2021-03-11 22:33:29,744 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 18 transitions. [2021-03-11 22:33:29,744 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 22:33:29,744 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 18 transitions. [2021-03-11 22:33:29,745 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,745 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,745 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,745 INFO L185 Difference]: Start difference. First operand has 10 places, 5 transitions, 17 flow. Second operand 3 states and 18 transitions. [2021-03-11 22:33:29,745 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 11 places, 4 transitions, 19 flow [2021-03-11 22:33:29,746 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 10 places, 4 transitions, 18 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-11 22:33:29,746 INFO L241 Difference]: Finished difference. Result has 10 places, 0 transitions, 0 flow [2021-03-11 22:33:29,746 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=10, PETRI_DIFFERENCE_MINUEND_FLOW=14, PETRI_DIFFERENCE_MINUEND_PLACES=8, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=4, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=4, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=0, PETRI_PLACES=10, PETRI_TRANSITIONS=0} [2021-03-11 22:33:29,747 INFO L335 CegarLoopForPetriNet]: 9 programPoint places, 1 predicate places. [2021-03-11 22:33:29,747 INFO L480 AbstractCegarLoop]: Abstraction has has 10 places, 0 transitions, 0 flow [2021-03-11 22:33:29,747 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 22:33:29,747 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-11 22:33:29,750 INFO L202 PluginConnector]: Adding new model example_epsilon_write.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.03 10:33:29 BasicIcfg [2021-03-11 22:33:29,750 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-11 22:33:29,751 INFO L168 Benchmark]: Toolchain (without parser) took 610.91 ms. Allocated memory is still 255.9 MB. Free memory was 236.9 MB in the beginning and 212.7 MB in the end (delta: 24.2 MB). Peak memory consumption was 24.5 MB. Max. memory is 16.0 GB. [2021-03-11 22:33:29,752 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.15 ms. Allocated memory is still 255.9 MB. Free memory was 238.0 MB in the beginning and 238.0 MB in the end (delta: 25.0 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-11 22:33:29,752 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.67 ms. Allocated memory is still 255.9 MB. Free memory was 236.5 MB in the beginning and 235.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-11 22:33:29,753 INFO L168 Benchmark]: Boogie Preprocessor took 11.81 ms. Allocated memory is still 255.9 MB. Free memory was 234.9 MB in the beginning and 234.2 MB in the end (delta: 724.8 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-11 22:33:29,753 INFO L168 Benchmark]: RCFGBuilder took 186.26 ms. Allocated memory is still 255.9 MB. Free memory was 234.1 MB in the beginning and 240.4 MB in the end (delta: -6.4 MB). Peak memory consumption was 18.2 MB. Max. memory is 16.0 GB. [2021-03-11 22:33:29,754 INFO L168 Benchmark]: TraceAbstraction took 378.07 ms. Allocated memory is still 255.9 MB. Free memory was 239.8 MB in the beginning and 212.7 MB in the end (delta: 27.1 MB). Peak memory consumption was 27.3 MB. Max. memory is 16.0 GB. [2021-03-11 22:33:29,756 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 0.15 ms. Allocated memory is still 255.9 MB. Free memory was 238.0 MB in the beginning and 238.0 MB in the end (delta: 25.0 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 22.67 ms. Allocated memory is still 255.9 MB. Free memory was 236.5 MB in the beginning and 235.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 11.81 ms. Allocated memory is still 255.9 MB. Free memory was 234.9 MB in the beginning and 234.2 MB in the end (delta: 724.8 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 186.26 ms. Allocated memory is still 255.9 MB. Free memory was 234.1 MB in the beginning and 240.4 MB in the end (delta: -6.4 MB). Peak memory consumption was 18.2 MB. Max. memory is 16.0 GB. * TraceAbstraction took 378.07 ms. Allocated memory is still 255.9 MB. Free memory was 239.8 MB in the beginning and 212.7 MB in the end (delta: 27.1 MB). Peak memory consumption was 27.3 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 35.6ms, 10 PlacesBefore, 9 PlacesAfterwards, 6 TransitionsBefore, 5 TransitionsAfterwards, 4 CoEnabledTransitionPairs, 1 FixpointIterations, 0 TrivialSequentialCompositions, 1 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 1 TotalNumberOfCompositions, 6 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 5, positive: 3, positive conditional: 0, positive unconditional: 3, negative: 2, negative conditional: 0, negative unconditional: 2, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.Independence Queries: [ total: 4, positive: 2, positive conditional: 0, positive unconditional: 2, 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: 4, positive: 1, positive conditional: 0, positive unconditional: 1, negative: 3, negative conditional: 0, negative unconditional: 3, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Independence Queries: [ total: 3, positive: 1, positive conditional: 0, positive unconditional: 1, negative: 2, negative conditional: 0, negative unconditional: 2, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , SemanticIndependenceRelation.Query Time [ms]: [ total: 13, positive: 4, positive conditional: 0, positive unconditional: 4, negative: 9, negative conditional: 0, negative unconditional: 9, unknown: 0, unknown conditional: 0, unknown unconditional: 0] ], Cache Queries: [ total: 5, positive: 1, positive conditional: 0, positive unconditional: 1, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 4, unknown conditional: 0, unknown unconditional: 4] , Statistics on independence cache: Total cache size (in pairs): 2, Positive cache size: 1, Positive conditional cache size: 0, Positive unconditional cache size: 1, Negative cache size: 1, Negative conditional cache size: 0, Negative unconditional cache size: 1 - PositiveResult [Line: 16]: assertion always holds For all program executions holds that assertion always holds at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 10 locations, 1 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 2.0ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 277.9ms, OverallIterations: 2, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 52.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 79.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 4 SDtfs, 1 SDslu, 0 SDs, 0 SdLazy, 3 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.6ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=1, InterpolantAutomatonStates: 6, 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: 3.2ms SsaConstructionTime, 10.9ms SatisfiabilityAnalysisTime, 45.1ms InterpolantComputationTime, 10 NumberOfCodeBlocks, 10 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 8 ConstructedInterpolants, 0 QuantifiedInterpolants, 14 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...