/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/ForkInForkedProcedure01.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-7cd14b8b9f04096d8ddfd3d9cd8a4ac590fe5404-7cd14b8 [2021-03-11 04:35:39,178 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-11 04:35:39,180 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-11 04:35:39,217 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-03-11 04:35:39,266 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 04:35:39,296 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-11 04:35:39,296 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-11 04:35:39,298 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-11 04:35:39,298 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-11 04:35:39,298 INFO L138 SettingsManager]: * Use SBE=true [2021-03-11 04:35:39,298 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-11 04:35:39,298 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-11 04:35:39,298 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-11 04:35:39,299 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-11 04:35:39,299 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-11 04:35:39,299 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-11 04:35:39,299 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-11 04:35:39,299 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-11 04:35:39,299 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-11 04:35:39,299 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-11 04:35:39,300 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-11 04:35:39,300 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-11 04:35:39,300 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-11 04:35:39,300 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-11 04:35:39,300 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-11 04:35:39,300 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-11 04:35:39,300 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-11 04:35:39,301 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-11 04:35:39,301 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-11 04:35:39,301 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-11 04:35:39,301 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-11 04:35:39,301 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-11 04:35:39,301 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-03-11 04:35:39,301 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-11 04:35:39,302 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-11 04:35:39,617 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-11 04:35:39,633 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-11 04:35:39,635 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-11 04:35:39,636 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-11 04:35:39,637 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-11 04:35:39,638 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/ForkInForkedProcedure01.bpl [2021-03-11 04:35:39,657 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/ForkInForkedProcedure01.bpl' [2021-03-11 04:35:39,684 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-11 04:35:39,688 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-11 04:35:39,688 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-11 04:35:39,689 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-11 04:35:39,689 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-11 04:35:39,698 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,704 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,711 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-11 04:35:39,713 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-11 04:35:39,713 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-11 04:35:39,713 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-11 04:35:39,720 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,721 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,721 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,722 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,724 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,724 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,725 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/1) ... [2021-03-11 04:35:39,726 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-11 04:35:39,727 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-11 04:35:39,727 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-11 04:35:39,727 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-11 04:35:39,728 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (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 04:35:39,791 INFO L124 BoogieDeclarations]: Specification and implementation of procedure bar given in one single declaration [2021-03-11 04:35:39,791 INFO L130 BoogieDeclarations]: Found specification of procedure bar [2021-03-11 04:35:39,791 INFO L138 BoogieDeclarations]: Found implementation of procedure bar [2021-03-11 04:35:39,791 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2021-03-11 04:35:39,791 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-03-11 04:35:39,792 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-03-11 04:35:39,792 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-03-11 04:35:39,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-11 04:35:39,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-11 04:35:39,793 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 04:35:39,898 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-11 04:35:39,898 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-11 04:35:39,899 INFO L202 PluginConnector]: Adding new model ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 04:35:39 BoogieIcfgContainer [2021-03-11 04:35:39,900 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-11 04:35:39,912 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-11 04:35:39,912 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-11 04:35:39,915 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-11 04:35:39,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:35:39" (1/2) ... [2021-03-11 04:35:39,916 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@253d4dc1 and model type ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.03 04:35:39, skipping insertion in model container [2021-03-11 04:35:39,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 04:35:39" (2/2) ... [2021-03-11 04:35:39,917 INFO L111 eAbstractionObserver]: Analyzing ICFG ForkInForkedProcedure01.bpl [2021-03-11 04:35:39,922 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-11 04:35:39,926 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-11 04:35:39,927 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-11 04:35:39,955 WARN L313 ript$VariableManager]: TermVariabe barThread1of1ForFork0_res not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:35:39,956 WARN L313 ript$VariableManager]: TermVariabe barThread1of1ForFork0_res not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:35:39,963 WARN L313 ript$VariableManager]: TermVariabe barThread1of1ForFork0_res not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:35:39,968 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_res not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:35:39,975 WARN L313 ript$VariableManager]: TermVariabe barThread1of1ForFork0_res not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:35:39,996 INFO L149 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2021-03-11 04:35:40,011 INFO L253 AbstractCegarLoop]: Starting to check reachability of 4 error locations. [2021-03-11 04:35:40,038 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:35:40,038 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:35:40,038 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:35:40,038 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:35:40,038 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:35:40,039 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:35:40,039 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:35:40,039 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:35:40,050 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 16 transitions, 51 flow [2021-03-11 04:35:40,073 INFO L129 PetriNetUnfolder]: 1/17 cut-off events. [2021-03-11 04:35:40,073 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-11 04:35:40,076 INFO L84 FinitePrefix]: Finished finitePrefix Result has 27 conditions, 17 events. 1/17 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 17 event pairs, 0 based on Foata normal form. 0/14 useless extension candidates. Maximal degree in co-relation 14. Up to 3 conditions per place. [2021-03-11 04:35:40,076 INFO L82 GeneralOperation]: Start removeDead. Operand has 21 places, 16 transitions, 51 flow [2021-03-11 04:35:40,079 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 17 places, 12 transitions, 39 flow [2021-03-11 04:35:40,087 INFO L129 PetriNetUnfolder]: 1/11 cut-off events. [2021-03-11 04:35:40,087 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-11 04:35:40,088 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:35:40,088 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:35:40,088 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, fooErr0INUSE_VIOLATION, fooThread1of1ForFork1Err2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:35:40,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:35:40,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1697488394, now seen corresponding path program 1 times [2021-03-11 04:35:40,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:35:40,102 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939945535] [2021-03-11 04:35:40,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:35:40,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:35:40,209 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:35:40,210 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 04:35:40,216 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:35:40,216 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:35:40,226 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:35:40,228 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 04:35:40,230 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 04:35:40,231 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939945535] [2021-03-11 04:35:40,231 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:35:40,231 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-11 04:35:40,232 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86293481] [2021-03-11 04:35:40,238 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:35:40,239 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:35:40,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:35:40,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:35:40,254 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 16 [2021-03-11 04:35:40,257 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 17 places, 12 transitions, 39 flow. Second operand has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 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 04:35:40,257 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:35:40,258 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 16 [2021-03-11 04:35:40,258 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:35:40,271 INFO L129 PetriNetUnfolder]: 1/11 cut-off events. [2021-03-11 04:35:40,271 INFO L130 PetriNetUnfolder]: For 5/5 co-relation queries the response was YES. [2021-03-11 04:35:40,272 INFO L84 FinitePrefix]: Finished finitePrefix Result has 22 conditions, 11 events. 1/11 cut-off events. For 5/5 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 4 event pairs, 0 based on Foata normal form. 1/11 useless extension candidates. Maximal degree in co-relation 12. Up to 3 conditions per place. [2021-03-11 04:35:40,273 INFO L132 encePairwiseOnDemand]: 14/16 looper letters, 0 selfloop transitions, 1 changer transitions 0/11 dead transitions. [2021-03-11 04:35:40,273 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 19 places, 11 transitions, 36 flow [2021-03-11 04:35:40,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:35:40,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:35:40,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 44 transitions. [2021-03-11 04:35:40,282 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.9166666666666666 [2021-03-11 04:35:40,283 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 44 transitions. [2021-03-11 04:35:40,283 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 44 transitions. [2021-03-11 04:35:40,284 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:35:40,286 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 44 transitions. [2021-03-11 04:35:40,288 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 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 04:35:40,294 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 04:35:40,295 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 04:35:40,296 INFO L185 Difference]: Start difference. First operand has 17 places, 12 transitions, 39 flow. Second operand 3 states and 44 transitions. [2021-03-11 04:35:40,297 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 19 places, 11 transitions, 36 flow [2021-03-11 04:35:40,300 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 15 places, 11 transitions, 26 flow, removed 0 selfloop flow, removed 4 redundant places. [2021-03-11 04:35:40,302 INFO L241 Difference]: Finished difference. Result has 15 places, 11 transitions, 26 flow [2021-03-11 04:35:40,304 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=16, PETRI_DIFFERENCE_MINUEND_FLOW=24, PETRI_DIFFERENCE_MINUEND_PLACES=13, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=26, PETRI_PLACES=15, PETRI_TRANSITIONS=11} [2021-03-11 04:35:40,304 INFO L335 CegarLoopForPetriNet]: 17 programPoint places, -2 predicate places. [2021-03-11 04:35:40,305 INFO L480 AbstractCegarLoop]: Abstraction has has 15 places, 11 transitions, 26 flow [2021-03-11 04:35:40,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 14.666666666666666) internal successors, (44), 3 states have internal predecessors, (44), 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 04:35:40,305 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:35:40,306 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:35:40,306 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-11 04:35:40,306 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, fooErr0INUSE_VIOLATION, fooThread1of1ForFork1Err2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:35:40,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:35:40,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1697396107, now seen corresponding path program 1 times [2021-03-11 04:35:40,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:35:40,308 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236877579] [2021-03-11 04:35:40,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:35:40,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:35:40,342 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:35:40,343 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 04:35:40,344 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:35:40,346 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:35:40,361 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 04:35:40,361 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236877579] [2021-03-11 04:35:40,361 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:35:40,361 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-03-11 04:35:40,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851311137] [2021-03-11 04:35:40,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-03-11 04:35:40,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:35:40,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-03-11 04:35:40,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-03-11 04:35:40,364 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 16 [2021-03-11 04:35:40,364 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 15 places, 11 transitions, 26 flow. Second operand has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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 04:35:40,364 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:35:40,364 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 16 [2021-03-11 04:35:40,364 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:35:40,387 INFO L129 PetriNetUnfolder]: 1/11 cut-off events. [2021-03-11 04:35:40,387 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:35:40,387 INFO L84 FinitePrefix]: Finished finitePrefix Result has 20 conditions, 11 events. 1/11 cut-off events. For 0/0 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 4 event pairs, 0 based on Foata normal form. 1/11 useless extension candidates. Maximal degree in co-relation 11. Up to 3 conditions per place. [2021-03-11 04:35:40,388 INFO L132 encePairwiseOnDemand]: 13/16 looper letters, 1 selfloop transitions, 2 changer transitions 0/11 dead transitions. [2021-03-11 04:35:40,388 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 11 transitions, 32 flow [2021-03-11 04:35:40,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-03-11 04:35:40,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-03-11 04:35:40,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 40 transitions. [2021-03-11 04:35:40,389 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.8333333333333334 [2021-03-11 04:35:40,389 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 40 transitions. [2021-03-11 04:35:40,389 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 40 transitions. [2021-03-11 04:35:40,389 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:35:40,389 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 40 transitions. [2021-03-11 04:35:40,390 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 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 04:35:40,390 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 04:35:40,391 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-11 04:35:40,391 INFO L185 Difference]: Start difference. First operand has 15 places, 11 transitions, 26 flow. Second operand 3 states and 40 transitions. [2021-03-11 04:35:40,391 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 11 transitions, 32 flow [2021-03-11 04:35:40,391 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 16 places, 11 transitions, 31 flow, removed 0 selfloop flow, removed 1 redundant places. [2021-03-11 04:35:40,392 INFO L241 Difference]: Finished difference. Result has 17 places, 11 transitions, 33 flow [2021-03-11 04:35:40,392 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=16, PETRI_DIFFERENCE_MINUEND_FLOW=25, PETRI_DIFFERENCE_MINUEND_PLACES=14, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=11, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=2, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=9, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=33, PETRI_PLACES=17, PETRI_TRANSITIONS=11} [2021-03-11 04:35:40,399 INFO L335 CegarLoopForPetriNet]: 17 programPoint places, 0 predicate places. [2021-03-11 04:35:40,400 INFO L480 AbstractCegarLoop]: Abstraction has has 17 places, 11 transitions, 33 flow [2021-03-11 04:35:40,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 12.666666666666666) internal successors, (38), 3 states have internal predecessors, (38), 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 04:35:40,400 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:35:40,400 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:35:40,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-11 04:35:40,400 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, fooErr0INUSE_VIOLATION, fooThread1of1ForFork1Err2INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:35:40,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:35:40,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1082403534, now seen corresponding path program 1 times [2021-03-11 04:35:40,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:35:40,401 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301631218] [2021-03-11 04:35:40,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:35:40,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:35:40,407 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:35:40,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:35:40,411 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:35:40,439 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:35:40,439 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:35:40,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-11 04:35:40,462 INFO L202 PluginConnector]: Adding new model ForkInForkedProcedure01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.03 04:35:40 BasicIcfg [2021-03-11 04:35:40,462 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-11 04:35:40,463 INFO L168 Benchmark]: Toolchain (without parser) took 778.04 ms. Allocated memory is still 255.9 MB. Free memory was 236.8 MB in the beginning and 212.5 MB in the end (delta: 24.3 MB). Peak memory consumption was 23.4 MB. Max. memory is 16.0 GB. [2021-03-11 04:35:40,463 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.14 ms. Allocated memory is still 255.9 MB. Free memory is still 237.7 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-03-11 04:35:40,464 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.14 ms. Allocated memory is still 255.9 MB. Free memory was 236.3 MB in the beginning and 234.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-11 04:35:40,464 INFO L168 Benchmark]: Boogie Preprocessor took 13.72 ms. Allocated memory is still 255.9 MB. Free memory was 234.7 MB in the beginning and 233.9 MB in the end (delta: 821.3 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-11 04:35:40,465 INFO L168 Benchmark]: RCFGBuilder took 172.66 ms. Allocated memory is still 255.9 MB. Free memory was 233.8 MB in the beginning and 225.5 MB in the end (delta: 8.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. [2021-03-11 04:35:40,466 INFO L168 Benchmark]: TraceAbstraction took 549.73 ms. Allocated memory is still 255.9 MB. Free memory was 241.4 MB in the beginning and 212.5 MB in the end (delta: 28.9 MB). Peak memory consumption was 27.3 MB. Max. memory is 16.0 GB. [2021-03-11 04:35:40,468 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 0.14 ms. Allocated memory is still 255.9 MB. Free memory is still 237.7 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 23.14 ms. Allocated memory is still 255.9 MB. Free memory was 236.3 MB in the beginning and 234.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 13.72 ms. Allocated memory is still 255.9 MB. Free memory was 234.7 MB in the beginning and 233.9 MB in the end (delta: 821.3 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 172.66 ms. Allocated memory is still 255.9 MB. Free memory was 233.8 MB in the beginning and 225.5 MB in the end (delta: 8.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. * TraceAbstraction took 549.73 ms. Allocated memory is still 255.9 MB. Free memory was 241.4 MB in the beginning and 212.5 MB in the end (delta: 28.9 MB). Peak memory consumption was 27.3 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 23]: assertion can be violated assertion can be violated We found a FailurePath: [L17] 0 x := 0; VAL [x=0] [L18] 0 g := 0; VAL [g=0, x=0] [L20] FORK 0 fork 1 foo(x); VAL [g=0, n=0, x=0] [L29] FORK 1 fork 2 bar(n); VAL [g=0, n=0, n=0, x=0] [L30] 1 g := g + 1; VAL [g=1, n=0, n=0, x=0] [L36] 2 res := 23; VAL [g=1, n=0, n=0, res=23, x=0] [L21] JOIN 2 join 2; VAL [g=1, n=0, n=0, res=23, x=0] [L23] 0 assert g == 0; VAL [g=1, n=0, n=0, res=23, x=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 15 locations, 1 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 7.7ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 409.5ms, OverallIterations: 3, TraceHistogramMax: 1, EmptinessCheckTime: 0.0ms, AutomataDifference: 93.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 40.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 3 SDtfs, 0 SDslu, 0 SDs, 0 SdLazy, 3 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 16.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred in iteration=0, 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: 9.9ms SsaConstructionTime, 27.2ms SatisfiabilityAnalysisTime, 88.0ms InterpolantComputationTime, 25 NumberOfCodeBlocks, 25 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 14 ConstructedInterpolants, 0 QuantifiedInterpolants, 34 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 incorrect! Received shutdown request...