/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-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/join_multiple_return_values.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-7cd14b8b9f04096d8ddfd3d9cd8a4ac590fe5404-7cd14b8 [2021-03-11 04:36:28,971 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-11 04:36:28,974 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-11 04:36:29,008 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-11 04:36:29,061 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-11 04:36:29,062 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-11 04:36:29,063 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-11 04:36:29,063 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-NoLbe.epf [2021-03-11 04:36:29,097 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-11 04:36:29,097 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-11 04:36:29,100 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-11 04:36:29,100 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-11 04:36:29,101 INFO L138 SettingsManager]: * Use SBE=true [2021-03-11 04:36:29,101 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-11 04:36:29,101 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-11 04:36:29,101 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-11 04:36:29,101 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-11 04:36:29,102 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-11 04:36:29,102 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-11 04:36:29,103 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-11 04:36:29,103 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-11 04:36:29,103 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-11 04:36:29,103 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-11 04:36:29,103 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-11 04:36:29,103 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-11 04:36:29,104 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-11 04:36:29,104 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-11 04:36:29,104 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-11 04:36:29,104 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-11 04:36:29,104 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-11 04:36:29,105 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-11 04:36:29,105 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-11 04:36:29,105 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-11 04:36:29,105 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-11 04:36:29,105 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-11 04:36:29,105 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-03-11 04:36:29,106 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-11 04:36:29,106 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-11 04:36:29,413 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-11 04:36:29,430 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-11 04:36:29,432 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-11 04:36:29,433 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-11 04:36:29,433 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-11 04:36:29,434 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/join_multiple_return_values.bpl [2021-03-11 04:36:29,434 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/join_multiple_return_values.bpl' [2021-03-11 04:36:29,471 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-11 04:36:29,476 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-11 04:36:29,477 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-11 04:36:29,477 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-11 04:36:29,477 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-11 04:36:29,488 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,496 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,502 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-11 04:36:29,503 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-11 04:36:29,503 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-11 04:36:29,504 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-11 04:36:29,510 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,511 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,512 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,512 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,515 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,516 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,516 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/1) ... [2021-03-11 04:36:29,517 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-11 04:36:29,518 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-11 04:36:29,518 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-11 04:36:29,518 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-11 04:36:29,519 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (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 04:36:29,584 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-03-11 04:36:29,584 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-03-11 04:36:29,584 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-11 04:36:29,584 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-11 04:36:29,585 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 04:36:29,716 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-11 04:36:29,716 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-11 04:36:29,718 INFO L202 PluginConnector]: Adding new model join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 04:36:29 BoogieIcfgContainer [2021-03-11 04:36:29,718 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-11 04:36:29,720 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-11 04:36:29,720 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-11 04:36:29,722 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-11 04:36:29,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:29" (1/2) ... [2021-03-11 04:36:29,724 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d8d1f9d and model type join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.03 04:36:29, skipping insertion in model container [2021-03-11 04:36:29,724 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 04:36:29" (2/2) ... [2021-03-11 04:36:29,725 INFO L111 eAbstractionObserver]: Analyzing ICFG join_multiple_return_values.bpl [2021-03-11 04:36:29,732 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-11 04:36:29,735 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-11 04:36:29,735 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-11 04:36:29,762 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_num not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,762 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_num not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,763 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_num not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,763 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_num not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,764 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_num not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,764 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,765 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_num not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,765 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,766 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,766 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,766 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret_bool not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,767 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret_bool not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,767 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret_bool not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,768 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret_bool not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,772 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret_bool not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,773 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_ret not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:29,782 INFO L149 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2021-03-11 04:36:29,797 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-03-11 04:36:29,825 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:36:29,825 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:36:29,825 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:36:29,825 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:36:29,825 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:36:29,825 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:36:29,826 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:36:29,826 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:36:29,836 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 18 places, 15 transitions, 38 flow [2021-03-11 04:36:29,858 INFO L129 PetriNetUnfolder]: 1/14 cut-off events. [2021-03-11 04:36:29,859 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-11 04:36:29,861 INFO L84 FinitePrefix]: Finished finitePrefix Result has 19 conditions, 14 events. 1/14 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 8 event pairs, 0 based on Foata normal form. 0/12 useless extension candidates. Maximal degree in co-relation 8. Up to 2 conditions per place. [2021-03-11 04:36:29,861 INFO L82 GeneralOperation]: Start removeDead. Operand has 18 places, 15 transitions, 38 flow [2021-03-11 04:36:29,864 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 15 places, 12 transitions, 30 flow [2021-03-11 04:36:29,870 INFO L129 PetriNetUnfolder]: 1/11 cut-off events. [2021-03-11 04:36:29,870 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-11 04:36:29,870 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:36:29,871 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:36:29,871 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:36:29,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:36:29,882 INFO L82 PathProgramCache]: Analyzing trace with hash 788222649, now seen corresponding path program 1 times [2021-03-11 04:36:29,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:36:29,889 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105424912] [2021-03-11 04:36:29,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:36:29,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:36:29,992 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:29,993 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:30,021 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:30,022 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:30,048 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:30,049 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 04:36:30,050 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 04:36:30,050 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105424912] [2021-03-11 04:36:30,051 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:36:30,051 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-11 04:36:30,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631413563] [2021-03-11 04:36:30,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-11 04:36:30,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:36:30,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-11 04:36:30,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-03-11 04:36:30,083 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 6 out of 15 [2021-03-11 04:36:30,086 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 15 places, 12 transitions, 30 flow. Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 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 04:36:30,086 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:36:30,086 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 6 of 15 [2021-03-11 04:36:30,087 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:36:30,121 INFO L129 PetriNetUnfolder]: 2/13 cut-off events. [2021-03-11 04:36:30,121 INFO L130 PetriNetUnfolder]: For 3/4 co-relation queries the response was YES. [2021-03-11 04:36:30,121 INFO L84 FinitePrefix]: Finished finitePrefix Result has 30 conditions, 13 events. 2/13 cut-off events. For 3/4 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 8 event pairs, 0 based on Foata normal form. 1/14 useless extension candidates. Maximal degree in co-relation 16. Up to 7 conditions per place. [2021-03-11 04:36:30,122 INFO L132 encePairwiseOnDemand]: 11/15 looper letters, 6 selfloop transitions, 3 changer transitions 0/11 dead transitions. [2021-03-11 04:36:30,122 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 11 transitions, 46 flow [2021-03-11 04:36:30,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-11 04:36:30,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-11 04:36:30,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 41 transitions. [2021-03-11 04:36:30,132 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.5466666666666666 [2021-03-11 04:36:30,132 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 41 transitions. [2021-03-11 04:36:30,132 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 41 transitions. [2021-03-11 04:36:30,133 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:36:30,134 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 41 transitions. [2021-03-11 04:36:30,136 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 8.2) internal successors, (41), 5 states have internal predecessors, (41), 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 04:36:30,138 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 04:36:30,138 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 15.0) internal successors, (90), 6 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 04:36:30,140 INFO L185 Difference]: Start difference. First operand has 15 places, 12 transitions, 30 flow. Second operand 5 states and 41 transitions. [2021-03-11 04:36:30,140 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 11 transitions, 46 flow [2021-03-11 04:36:30,142 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 15 places, 11 transitions, 42 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-11 04:36:30,143 INFO L241 Difference]: Finished difference. Result has 15 places, 9 transitions, 26 flow [2021-03-11 04:36:30,144 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=15, PETRI_DIFFERENCE_MINUEND_FLOW=20, PETRI_DIFFERENCE_MINUEND_PLACES=11, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=9, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=6, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=26, PETRI_PLACES=15, PETRI_TRANSITIONS=9} [2021-03-11 04:36:30,145 INFO L335 CegarLoopForPetriNet]: 15 programPoint places, 0 predicate places. [2021-03-11 04:36:30,145 INFO L480 AbstractCegarLoop]: Abstraction has has 15 places, 9 transitions, 26 flow [2021-03-11 04:36:30,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 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 04:36:30,145 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:36:30,145 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:36:30,145 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-11 04:36:30,146 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:36:30,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:36:30,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1431888522, now seen corresponding path program 1 times [2021-03-11 04:36:30,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:36:30,146 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067199166] [2021-03-11 04:36:30,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:36:30,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:36:30,192 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:30,194 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-11 04:36:30,210 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:30,211 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-11 04:36:30,234 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:30,235 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-03-11 04:36:30,247 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:30,248 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-11 04:36:30,261 INFO L142 QuantifierPusher]: treesize reduction 9, result has 50.0 percent of original size [2021-03-11 04:36:30,262 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-03-11 04:36:30,273 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 04:36:30,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067199166] [2021-03-11 04:36:30,273 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:36:30,273 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-03-11 04:36:30,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891351483] [2021-03-11 04:36:30,275 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-03-11 04:36:30,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:36:30,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-03-11 04:36:30,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-03-11 04:36:30,276 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 3 out of 15 [2021-03-11 04:36:30,277 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 15 places, 9 transitions, 26 flow. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 04:36:30,277 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:36:30,277 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 3 of 15 [2021-03-11 04:36:30,277 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:36:30,379 INFO L129 PetriNetUnfolder]: 3/15 cut-off events. [2021-03-11 04:36:30,379 INFO L130 PetriNetUnfolder]: For 4/4 co-relation queries the response was YES. [2021-03-11 04:36:30,379 INFO L84 FinitePrefix]: Finished finitePrefix Result has 38 conditions, 15 events. 3/15 cut-off events. For 4/4 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 11 event pairs, 0 based on Foata normal form. 1/16 useless extension candidates. Maximal degree in co-relation 3. Up to 4 conditions per place. [2021-03-11 04:36:30,380 INFO L132 encePairwiseOnDemand]: 8/15 looper letters, 0 selfloop transitions, 0 changer transitions 13/13 dead transitions. [2021-03-11 04:36:30,380 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 13 transitions, 62 flow [2021-03-11 04:36:30,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-03-11 04:36:30,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2021-03-11 04:36:30,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 43 transitions. [2021-03-11 04:36:30,382 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.2866666666666667 [2021-03-11 04:36:30,382 INFO L72 ComplementDD]: Start complementDD. Operand 10 states and 43 transitions. [2021-03-11 04:36:30,382 INFO L73 IsDeterministic]: Start isDeterministic. Operand 10 states and 43 transitions. [2021-03-11 04:36:30,383 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:36:30,383 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 10 states and 43 transitions. [2021-03-11 04:36:30,383 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 11 states, 10 states have (on average 4.3) internal successors, (43), 10 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) [2021-03-11 04:36:30,384 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 11 states, 11 states have (on average 15.0) internal successors, (165), 11 states have internal predecessors, (165), 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 04:36:30,385 INFO L81 ComplementDD]: Finished complementDD. Result has 11 states, 11 states have (on average 15.0) internal successors, (165), 11 states have internal predecessors, (165), 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 04:36:30,385 INFO L185 Difference]: Start difference. First operand has 15 places, 9 transitions, 26 flow. Second operand 10 states and 43 transitions. [2021-03-11 04:36:30,385 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 13 transitions, 62 flow [2021-03-11 04:36:30,390 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 20 places, 13 transitions, 55 flow, removed 0 selfloop flow, removed 3 redundant places. [2021-03-11 04:36:30,391 INFO L241 Difference]: Finished difference. Result has 20 places, 0 transitions, 0 flow [2021-03-11 04:36:30,391 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=15, PETRI_DIFFERENCE_MINUEND_FLOW=19, PETRI_DIFFERENCE_MINUEND_PLACES=11, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=8, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=0, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=8, PETRI_DIFFERENCE_SUBTRAHEND_STATES=10, PETRI_FLOW=0, PETRI_PLACES=20, PETRI_TRANSITIONS=0} [2021-03-11 04:36:30,392 INFO L335 CegarLoopForPetriNet]: 15 programPoint places, 5 predicate places. [2021-03-11 04:36:30,392 INFO L480 AbstractCegarLoop]: Abstraction has has 20 places, 0 transitions, 0 flow [2021-03-11 04:36:30,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 04:36:30,392 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-11 04:36:30,396 INFO L202 PluginConnector]: Adding new model join_multiple_return_values.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.03 04:36:30 BasicIcfg [2021-03-11 04:36:30,396 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-11 04:36:30,397 INFO L168 Benchmark]: Toolchain (without parser) took 924.59 ms. Allocated memory was 255.9 MB in the beginning and 379.6 MB in the end (delta: 123.7 MB). Free memory was 236.5 MB in the beginning and 363.9 MB in the end (delta: -127.4 MB). Peak memory consumption was 50.2 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:30,398 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.10 ms. Allocated memory is still 255.9 MB. Free memory is still 237.6 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-03-11 04:36:30,398 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.50 ms. Allocated memory is still 255.9 MB. Free memory was 236.1 MB in the beginning and 234.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:30,399 INFO L168 Benchmark]: Boogie Preprocessor took 13.97 ms. Allocated memory is still 255.9 MB. Free memory was 234.5 MB in the beginning and 233.8 MB in the end (delta: 722.6 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-11 04:36:30,399 INFO L168 Benchmark]: RCFGBuilder took 200.13 ms. Allocated memory is still 255.9 MB. Free memory was 233.6 MB in the beginning and 240.9 MB in the end (delta: -7.2 MB). Peak memory consumption was 18.5 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:30,400 INFO L168 Benchmark]: TraceAbstraction took 676.38 ms. Allocated memory was 255.9 MB in the beginning and 379.6 MB in the end (delta: 123.7 MB). Free memory was 240.2 MB in the beginning and 363.9 MB in the end (delta: -123.7 MB). Peak memory consumption was 52.7 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:30,402 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 0.10 ms. Allocated memory is still 255.9 MB. Free memory is still 237.6 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 25.50 ms. Allocated memory is still 255.9 MB. Free memory was 236.1 MB in the beginning and 234.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 13.97 ms. Allocated memory is still 255.9 MB. Free memory was 234.5 MB in the beginning and 233.8 MB in the end (delta: 722.6 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 200.13 ms. Allocated memory is still 255.9 MB. Free memory was 233.6 MB in the beginning and 240.9 MB in the end (delta: -7.2 MB). Peak memory consumption was 18.5 MB. Max. memory is 16.0 GB. * TraceAbstraction took 676.38 ms. Allocated memory was 255.9 MB in the beginning and 379.6 MB in the end (delta: 123.7 MB). Free memory was 240.2 MB in the beginning and 363.9 MB in the end (delta: -123.7 MB). Peak memory consumption was 52.7 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 23]: 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, 15 locations, 1 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 5.9ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: SAFE, OverallTime: 571.5ms, OverallIterations: 2, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 181.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 38.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 9 SDtfs, 24 SDslu, 7 SDs, 0 SdLazy, 27 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 32.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 189.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=0, InterpolantAutomatonStates: 15, 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: 4.6ms SsaConstructionTime, 20.5ms SatisfiabilityAnalysisTime, 208.6ms InterpolantComputationTime, 18 NumberOfCodeBlocks, 18 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 16 ConstructedInterpolants, 0 QuantifiedInterpolants, 76 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...