/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-RepeatedSemanticLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/nested_fork.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-25 17:48:41,754 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-25 17:48:41,757 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-25 17:48:41,793 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-25 17:48:41,793 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-25 17:48:41,796 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-25 17:48:41,798 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-25 17:48:41,803 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-25 17:48:41,805 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-25 17:48:41,810 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-25 17:48:41,810 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-25 17:48:41,812 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-03-25 17:48:41,812 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-25 17:48:41,814 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-25 17:48:41,815 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-25 17:48:41,816 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-25 17:48:41,818 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-25 17:48:41,819 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-25 17:48:41,821 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-25 17:48:41,830 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-25 17:48:41,832 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-25 17:48:41,833 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-25 17:48:41,834 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-25 17:48:41,835 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-25 17:48:41,841 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-03-25 17:48:41,844 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-03-25 17:48:41,845 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-03-25 17:48:41,847 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-03-25 17:48:41,847 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-03-25 17:48:41,848 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-03-25 17:48:41,848 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-03-25 17:48:41,848 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-03-25 17:48:41,849 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-03-25 17:48:41,849 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-25 17:48:41,849 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-25 17:48:41,850 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-25 17:48:41,854 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-RepeatedSemanticLbe.epf [2021-03-25 17:48:41,888 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-25 17:48:41,888 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-25 17:48:41,892 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-25 17:48:41,892 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-25 17:48:41,892 INFO L138 SettingsManager]: * Use SBE=true [2021-03-25 17:48:41,892 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-25 17:48:41,892 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-25 17:48:41,893 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-25 17:48:41,893 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-25 17:48:41,893 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-25 17:48:41,894 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-25 17:48:41,894 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-25 17:48:41,894 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-25 17:48:41,894 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-25 17:48:41,894 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-25 17:48:41,895 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-25 17:48:41,895 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-25 17:48:41,895 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-25 17:48:41,895 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-25 17:48:41,895 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-25 17:48:41,895 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-25 17:48:41,896 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-25 17:48:41,896 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-25 17:48:41,896 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-25 17:48:41,896 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-25 17:48:41,896 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-25 17:48:41,896 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-25 17:48:41,896 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-25 17:48:41,896 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-03-25 17:48:41,897 INFO L138 SettingsManager]: * Apply repeated Lipton Reduction=true 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-25 17:48:42,168 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-25 17:48:42,189 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-25 17:48:42,191 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-25 17:48:42,192 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-25 17:48:42,193 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-25 17:48:42,194 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/nested_fork.bpl [2021-03-25 17:48:42,194 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/nested_fork.bpl' [2021-03-25 17:48:42,223 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-25 17:48:42,225 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-25 17:48:42,226 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-25 17:48:42,226 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-25 17:48:42,226 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-25 17:48:42,237 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,241 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,248 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-25 17:48:42,250 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-25 17:48:42,250 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-25 17:48:42,250 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-25 17:48:42,256 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,256 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,257 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,257 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,258 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,258 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,259 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/1) ... [2021-03-25 17:48:42,259 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-25 17:48:42,260 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-25 17:48:42,260 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-25 17:48:42,260 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-25 17:48:42,261 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (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 [2021-03-25 17:48:42,322 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-03-25 17:48:42,322 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-03-25 17:48:42,322 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-03-25 17:48:42,322 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-03-25 17:48:42,322 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-03-25 17:48:42,322 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-03-25 17:48:42,322 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-25 17:48:42,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-25 17:48:42,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-25 17:48:42,323 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-25 17:48:42,413 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-25 17:48:42,414 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-25 17:48:42,415 INFO L202 PluginConnector]: Adding new model nested_fork.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 05:48:42 BoogieIcfgContainer [2021-03-25 17:48:42,415 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-25 17:48:42,416 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-25 17:48:42,416 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-25 17:48:42,418 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-25 17:48:42,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 25.03 05:48:42" (1/2) ... [2021-03-25 17:48:42,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6643902 and model type nested_fork.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.03 05:48:42, skipping insertion in model container [2021-03-25 17:48:42,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested_fork.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.03 05:48:42" (2/2) ... [2021-03-25 17:48:42,420 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_fork.bpl [2021-03-25 17:48:42,425 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-25 17:48:42,428 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-25 17:48:42,428 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-25 17:48:42,502 INFO L149 ThreadInstanceAdder]: Constructed 5 joinOtherThreadTransitions. [2021-03-25 17:48:42,519 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-25 17:48:42,549 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-25 17:48:42,549 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-25 17:48:42,549 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-25 17:48:42,549 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-25 17:48:42,549 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-25 17:48:42,549 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-25 17:48:42,549 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-25 17:48:42,549 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-25 17:48:42,560 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 20 places, 13 transitions, 45 flow [2021-03-25 17:48:42,579 INFO L129 PetriNetUnfolder]: 1/10 cut-off events. [2021-03-25 17:48:42,579 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-25 17:48:42,582 INFO L84 FinitePrefix]: Finished finitePrefix Result has 20 conditions, 10 events. 1/10 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 2 event pairs, 0 based on Foata normal form. 0/8 useless extension candidates. Maximal degree in co-relation 9. Up to 3 conditions per place. [2021-03-25 17:48:42,582 INFO L82 GeneralOperation]: Start removeDead. Operand has 20 places, 13 transitions, 45 flow [2021-03-25 17:48:42,585 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 14 places, 8 transitions, 31 flow [2021-03-25 17:48:42,586 INFO L165 etLargeBlockEncoding]: Petri net LBE is using semantic-based independence relation. [2021-03-25 17:48:42,605 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 14 places, 8 transitions, 31 flow [2021-03-25 17:48:42,612 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 14 places, 8 transitions, 31 flow [2021-03-25 17:48:42,613 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 14 places, 8 transitions, 31 flow [2021-03-25 17:48:42,620 INFO L129 PetriNetUnfolder]: 1/8 cut-off events. [2021-03-25 17:48:42,620 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-25 17:48:42,620 INFO L84 FinitePrefix]: Finished finitePrefix Result has 18 conditions, 8 events. 1/8 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 1. Compared 1 event pairs, 0 based on Foata normal form. 0/7 useless extension candidates. Maximal degree in co-relation 9. Up to 3 conditions per place. [2021-03-25 17:48:42,623 INFO L142 LiptonReduction]: Number of co-enabled transitions 0 [2021-03-25 17:48:42,626 INFO L154 LiptonReduction]: Checked pairs total: 0 [2021-03-25 17:48:42,626 INFO L156 LiptonReduction]: Total number of compositions: 0 [2021-03-25 17:48:42,629 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 44 [2021-03-25 17:48:42,641 INFO L129 PetriNetUnfolder]: 1/7 cut-off events. [2021-03-25 17:48:42,642 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-25 17:48:42,642 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-25 17:48:42,643 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-03-25 17:48:42,643 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr2INUSE_VIOLATION, thread1Err1INUSE_VIOLATION, thread1Thread1of1ForFork1Err0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-25 17:48:42,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-25 17:48:42,649 INFO L82 PathProgramCache]: Analyzing trace with hash -1046076716, now seen corresponding path program 1 times [2021-03-25 17:48:42,656 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-25 17:48:42,657 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698760051] [2021-03-25 17:48:42,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-25 17:48:42,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:48:42,721 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:48:42,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-25 17:48:42,728 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-25 17:48:42,742 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-25 17:48:42,743 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-25 17:48:42,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-25 17:48:42,757 INFO L202 PluginConnector]: Adding new model nested_fork.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.03 05:48:42 BasicIcfg [2021-03-25 17:48:42,757 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-25 17:48:42,759 INFO L168 Benchmark]: Toolchain (without parser) took 533.01 ms. Allocated memory is still 255.9 MB. Free memory was 236.6 MB in the beginning and 226.2 MB in the end (delta: 10.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 16.0 GB. [2021-03-25 17:48:42,760 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.11 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. [2021-03-25 17:48:42,761 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.05 ms. Allocated memory is still 255.9 MB. Free memory was 236.6 MB in the beginning and 235.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-25 17:48:42,762 INFO L168 Benchmark]: Boogie Preprocessor took 9.53 ms. Allocated memory is still 255.9 MB. Free memory was 235.1 MB in the beginning and 234.2 MB in the end (delta: 857.4 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-25 17:48:42,763 INFO L168 Benchmark]: RCFGBuilder took 154.87 ms. Allocated memory is still 255.9 MB. Free memory was 234.2 MB in the beginning and 227.1 MB in the end (delta: 7.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. [2021-03-25 17:48:42,763 INFO L168 Benchmark]: TraceAbstraction took 341.07 ms. Allocated memory is still 255.9 MB. Free memory was 226.6 MB in the beginning and 226.2 MB in the end (delta: 426.8 kB). Peak memory consumption was 1.0 MB. Max. memory is 16.0 GB. [2021-03-25 17:48:42,769 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 0.11 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 23.05 ms. Allocated memory is still 255.9 MB. Free memory was 236.6 MB in the beginning and 235.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 9.53 ms. Allocated memory is still 255.9 MB. Free memory was 235.1 MB in the beginning and 234.2 MB in the end (delta: 857.4 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 154.87 ms. Allocated memory is still 255.9 MB. Free memory was 234.2 MB in the beginning and 227.1 MB in the end (delta: 7.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. * TraceAbstraction took 341.07 ms. Allocated memory is still 255.9 MB. Free memory was 226.6 MB in the beginning and 226.2 MB in the end (delta: 426.8 kB). Peak memory consumption was 1.0 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 14.3ms, 14 PlacesBefore, 14 PlacesAfterwards, 8 TransitionsBefore, 8 TransitionsAfterwards, 0 CoEnabledTransitionPairs, 1 FixpointIterations, 0 TrivialSequentialCompositions, 0 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 0 TotalNumberOfCompositions, 0 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.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] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.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] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: UnionIndependenceRelation.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] , UnionIndependenceRelation.Statistics on underlying relations: [ SyntacticIndependenceRelation.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.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: 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] , 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 - CounterExampleResult [Line: 17]: assertion can be violated assertion can be violated We found a FailurePath: [L14] FORK 0 fork 1 thread1(); [L21] FORK 1 fork 2, 2 thread2(); [L22] JOIN 2 join 2, 2; [L16] JOIN 1 join 1; [L17] 0 assert false; - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 12 locations, 1 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 5.2ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 198.7ms, OverallIterations: 1, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 86.8ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred in iteration=0, InterpolantAutomatonStates: 0, 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, 10.2ms SatisfiabilityAnalysisTime, 0.0ms InterpolantComputationTime, 7 NumberOfCodeBlocks, 7 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 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 incorrect! Received shutdown request...