/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/fork_in_loop.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-7cd14b8b9f04096d8ddfd3d9cd8a4ac590fe5404-7cd14b8 [2021-03-11 04:36:18,894 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-11 04:36:18,895 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-11 04:36:18,915 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-11 04:36:18,916 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-11 04:36:18,916 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-11 04:36:18,917 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-11 04:36:18,918 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-11 04:36:18,919 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-11 04:36:18,920 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-11 04:36:18,920 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-11 04:36:18,921 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-03-11 04:36:18,921 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-11 04:36:18,922 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-11 04:36:18,922 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-11 04:36:18,923 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-11 04:36:18,923 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-11 04:36:18,924 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-11 04:36:18,925 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-11 04:36:18,926 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-11 04:36:18,927 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-11 04:36:18,928 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-11 04:36:18,928 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-11 04:36:18,929 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-11 04:36:18,931 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-03-11 04:36:18,935 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-11 04:36:18,936 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-11 04:36:18,936 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-11 04:36:18,940 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 04:36:18,960 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-11 04:36:18,961 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-11 04:36:18,963 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-11 04:36:18,963 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-11 04:36:18,963 INFO L138 SettingsManager]: * Use SBE=true [2021-03-11 04:36:18,963 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-11 04:36:18,964 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-11 04:36:18,964 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-11 04:36:18,964 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-11 04:36:18,964 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-11 04:36:18,964 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-11 04:36:18,965 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-11 04:36:18,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-11 04:36:18,965 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-11 04:36:18,966 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-11 04:36:18,966 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-11 04:36:18,966 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-11 04:36:18,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-11 04:36:18,966 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-03-11 04:36:18,966 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-11 04:36:18,966 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-11 04:36:19,172 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-11 04:36:19,193 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-11 04:36:19,194 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-11 04:36:19,195 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-11 04:36:19,197 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-11 04:36:19,200 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl [2021-03-11 04:36:19,201 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl' [2021-03-11 04:36:19,234 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-11 04:36:19,238 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-11 04:36:19,238 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-11 04:36:19,239 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-11 04:36:19,239 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-11 04:36:19,250 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,254 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,259 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-11 04:36:19,260 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-11 04:36:19,260 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-11 04:36:19,260 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-11 04:36:19,265 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,265 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,265 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,265 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,267 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,269 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,269 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/1) ... [2021-03-11 04:36:19,270 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-11 04:36:19,270 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-11 04:36:19,270 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-11 04:36:19,270 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-11 04:36:19,272 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (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 04:36:19,335 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2021-03-11 04:36:19,335 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-03-11 04:36:19,336 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-03-11 04:36:19,336 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-11 04:36:19,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-11 04:36:19,337 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 04:36:19,441 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-11 04:36:19,442 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-11 04:36:19,442 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 04:36:19 BoogieIcfgContainer [2021-03-11 04:36:19,443 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-11 04:36:19,444 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-11 04:36:19,444 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-11 04:36:19,445 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-11 04:36:19,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 11.03 04:36:19" (1/2) ... [2021-03-11 04:36:19,446 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@522970ef and model type fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.03 04:36:19, skipping insertion in model container [2021-03-11 04:36:19,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.03 04:36:19" (2/2) ... [2021-03-11 04:36:19,447 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_in_loop.bpl [2021-03-11 04:36:19,450 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-11 04:36:19,453 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-11 04:36:19,453 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-11 04:36:19,473 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,474 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,475 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,475 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,477 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,488 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,497 INFO L149 ThreadInstanceAdder]: Constructed 6 joinOtherThreadTransitions. [2021-03-11 04:36:19,509 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-11 04:36:19,522 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:36:19,523 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:36:19,523 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:36:19,523 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:36:19,523 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:36:19,523 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:36:19,523 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:36:19,523 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:36:19,529 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 25 transitions, 78 flow [2021-03-11 04:36:19,542 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-11 04:36:19,542 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-11 04:36:19,543 INFO L84 FinitePrefix]: Finished finitePrefix Result has 34 conditions, 23 events. 0/23 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 22 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-11 04:36:19,543 INFO L82 GeneralOperation]: Start removeDead. Operand has 27 places, 25 transitions, 78 flow [2021-03-11 04:36:19,546 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 21 places, 16 transitions, 45 flow [2021-03-11 04:36:19,548 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-03-11 04:36:19,549 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-03-11 04:36:19,549 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:36:19,549 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2021-03-11 04:36:19,549 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:36:19,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:36:19,570 INFO L82 PathProgramCache]: Analyzing trace with hash 1921556130, now seen corresponding path program 1 times [2021-03-11 04:36:19,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:36:19,576 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060103820] [2021-03-11 04:36:19,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:36:19,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:36:19,648 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:19,649 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:19,674 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:19,687 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:19,692 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:19,692 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 04:36:19,693 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-11 04:36:19,694 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060103820] [2021-03-11 04:36:19,694 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:36:19,694 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-11 04:36:19,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224354589] [2021-03-11 04:36:19,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-11 04:36:19,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:36:19,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-11 04:36:19,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 04:36:19,721 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-03-11 04:36:19,737 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 21 places, 16 transitions, 45 flow. Second operand has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 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 04:36:19,737 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:36:19,737 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-03-11 04:36:19,738 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:36:19,782 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-03-11 04:36:19,782 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-11 04:36:19,782 INFO L84 FinitePrefix]: Finished finitePrefix Result has 41 conditions, 18 events. 0/18 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 13 event pairs, 0 based on Foata normal form. 0/17 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-11 04:36:19,783 INFO L132 encePairwiseOnDemand]: 19/25 looper letters, 7 selfloop transitions, 4 changer transitions 1/17 dead transitions. [2021-03-11 04:36:19,783 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 17 transitions, 69 flow [2021-03-11 04:36:19,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-11 04:36:19,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-11 04:36:19,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 61 transitions. [2021-03-11 04:36:19,791 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.61 [2021-03-11 04:36:19,792 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 61 transitions. [2021-03-11 04:36:19,792 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 61 transitions. [2021-03-11 04:36:19,792 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:36:19,794 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 61 transitions. [2021-03-11 04:36:19,795 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 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 04:36:19,797 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 25.0) internal successors, (125), 5 states have internal predecessors, (125), 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 04:36:19,797 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 25.0) internal successors, (125), 5 states have internal predecessors, (125), 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 04:36:19,798 INFO L185 Difference]: Start difference. First operand has 21 places, 16 transitions, 45 flow. Second operand 4 states and 61 transitions. [2021-03-11 04:36:19,801 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 17 transitions, 69 flow [2021-03-11 04:36:19,804 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 17 transitions, 65 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-11 04:36:19,807 INFO L241 Difference]: Finished difference. Result has 23 places, 15 transitions, 56 flow [2021-03-11 04:36:19,808 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=25, PETRI_DIFFERENCE_MINUEND_FLOW=37, PETRI_DIFFERENCE_MINUEND_PLACES=18, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=15, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=11, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=56, PETRI_PLACES=23, PETRI_TRANSITIONS=15} [2021-03-11 04:36:19,809 INFO L335 CegarLoopForPetriNet]: 21 programPoint places, 2 predicate places. [2021-03-11 04:36:19,809 INFO L480 AbstractCegarLoop]: Abstraction has has 23 places, 15 transitions, 56 flow [2021-03-11 04:36:19,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 13.25) internal successors, (53), 4 states have internal predecessors, (53), 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 04:36:19,809 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:36:19,809 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:36:19,810 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-11 04:36:19,810 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:36:19,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:36:19,811 INFO L82 PathProgramCache]: Analyzing trace with hash -29839023, now seen corresponding path program 1 times [2021-03-11 04:36:19,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:36:19,811 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729672633] [2021-03-11 04:36:19,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:36:19,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:36:19,832 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:36:19,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:36:19,846 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:36:19,860 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:36:19,860 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:36:19,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-11 04:36:19,861 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-11 04:36:19,861 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-11 04:36:19,869 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,870 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,870 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,870 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,871 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,871 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,871 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,871 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,872 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,873 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,874 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,876 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-11 04:36:19,888 INFO L149 ThreadInstanceAdder]: Constructed 12 joinOtherThreadTransitions. [2021-03-11 04:36:19,888 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-11 04:36:19,894 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-11 04:36:19,895 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-11 04:36:19,895 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-11 04:36:19,895 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-11 04:36:19,895 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-11 04:36:19,895 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-11 04:36:19,895 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-11 04:36:19,895 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-11 04:36:19,897 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 37 places, 37 transitions, 134 flow [2021-03-11 04:36:19,929 INFO L129 PetriNetUnfolder]: 14/111 cut-off events. [2021-03-11 04:36:19,929 INFO L130 PetriNetUnfolder]: For 40/40 co-relation queries the response was YES. [2021-03-11 04:36:19,931 INFO L84 FinitePrefix]: Finished finitePrefix Result has 176 conditions, 111 events. 14/111 cut-off events. For 40/40 co-relation queries the response was YES. Maximal size of possible extension queue 10. Compared 399 event pairs, 0 based on Foata normal form. 0/94 useless extension candidates. Maximal degree in co-relation 80. Up to 15 conditions per place. [2021-03-11 04:36:19,931 INFO L82 GeneralOperation]: Start removeDead. Operand has 37 places, 37 transitions, 134 flow [2021-03-11 04:36:19,933 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 35 places, 33 transitions, 120 flow [2021-03-11 04:36:19,938 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-11 04:36:19,938 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-03-11 04:36:19,938 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:36:19,938 INFO L255 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1] [2021-03-11 04:36:19,939 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:36:19,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:36:19,939 INFO L82 PathProgramCache]: Analyzing trace with hash -889250761, now seen corresponding path program 1 times [2021-03-11 04:36:19,940 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:36:19,942 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394694061] [2021-03-11 04:36:19,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:36:19,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:36:19,966 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:19,970 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:19,974 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:19,975 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:19,983 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:19,983 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 04:36:19,983 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-11 04:36:19,983 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394694061] [2021-03-11 04:36:19,984 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:36:19,984 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-11 04:36:19,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716180899] [2021-03-11 04:36:19,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-11 04:36:19,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:36:19,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-11 04:36:19,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-11 04:36:19,985 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 37 [2021-03-11 04:36:19,985 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 35 places, 33 transitions, 120 flow. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 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 04:36:19,985 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:36:19,986 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 37 [2021-03-11 04:36:19,986 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:36:20,023 INFO L129 PetriNetUnfolder]: 1/32 cut-off events. [2021-03-11 04:36:20,023 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-03-11 04:36:20,023 INFO L84 FinitePrefix]: Finished finitePrefix Result has 72 conditions, 32 events. 1/32 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 4. Compared 38 event pairs, 0 based on Foata normal form. 0/28 useless extension candidates. Maximal degree in co-relation 66. Up to 11 conditions per place. [2021-03-11 04:36:20,024 INFO L132 encePairwiseOnDemand]: 30/37 looper letters, 10 selfloop transitions, 4 changer transitions 2/28 dead transitions. [2021-03-11 04:36:20,024 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 28 transitions, 118 flow [2021-03-11 04:36:20,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-11 04:36:20,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-11 04:36:20,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 97 transitions. [2021-03-11 04:36:20,027 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.6554054054054054 [2021-03-11 04:36:20,027 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 97 transitions. [2021-03-11 04:36:20,027 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 97 transitions. [2021-03-11 04:36:20,028 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:36:20,028 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 97 transitions. [2021-03-11 04:36:20,031 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 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 04:36:20,033 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 37.0) internal successors, (185), 5 states have internal predecessors, (185), 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 04:36:20,033 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 37.0) internal successors, (185), 5 states have internal predecessors, (185), 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 04:36:20,033 INFO L185 Difference]: Start difference. First operand has 35 places, 33 transitions, 120 flow. Second operand 4 states and 97 transitions. [2021-03-11 04:36:20,033 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 28 transitions, 118 flow [2021-03-11 04:36:20,035 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 31 places, 28 transitions, 114 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-11 04:36:20,038 INFO L241 Difference]: Finished difference. Result has 33 places, 25 transitions, 99 flow [2021-03-11 04:36:20,038 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=37, PETRI_DIFFERENCE_MINUEND_FLOW=74, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=20, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=99, PETRI_PLACES=33, PETRI_TRANSITIONS=25} [2021-03-11 04:36:20,038 INFO L335 CegarLoopForPetriNet]: 35 programPoint places, -2 predicate places. [2021-03-11 04:36:20,038 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 25 transitions, 99 flow [2021-03-11 04:36:20,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 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 04:36:20,038 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:36:20,039 INFO L255 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:36:20,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-11 04:36:20,039 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:36:20,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:36:20,039 INFO L82 PathProgramCache]: Analyzing trace with hash 448932334, now seen corresponding path program 1 times [2021-03-11 04:36:20,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:36:20,040 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5273224] [2021-03-11 04:36:20,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:36:20,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-11 04:36:20,077 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:20,077 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 04:36:20,078 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:20,079 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:20,082 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:20,082 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:20,085 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:20,086 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-11 04:36:20,090 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-11 04:36:20,090 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-11 04:36:20,090 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-11 04:36:20,090 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5273224] [2021-03-11 04:36:20,091 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-11 04:36:20,091 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-03-11 04:36:20,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828035492] [2021-03-11 04:36:20,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-11 04:36:20,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-11 04:36:20,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-11 04:36:20,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-03-11 04:36:20,092 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 37 [2021-03-11 04:36:20,093 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 25 transitions, 99 flow. Second operand has 5 states, 5 states have (on average 22.8) internal successors, (114), 5 states have internal predecessors, (114), 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 04:36:20,093 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-11 04:36:20,093 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 37 [2021-03-11 04:36:20,093 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-11 04:36:20,118 INFO L129 PetriNetUnfolder]: 1/27 cut-off events. [2021-03-11 04:36:20,119 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-03-11 04:36:20,119 INFO L84 FinitePrefix]: Finished finitePrefix Result has 73 conditions, 27 events. 1/27 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 23 event pairs, 0 based on Foata normal form. 1/28 useless extension candidates. Maximal degree in co-relation 65. Up to 7 conditions per place. [2021-03-11 04:36:20,119 INFO L132 encePairwiseOnDemand]: 31/37 looper letters, 9 selfloop transitions, 5 changer transitions 1/26 dead transitions. [2021-03-11 04:36:20,119 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 36 places, 26 transitions, 129 flow [2021-03-11 04:36:20,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-11 04:36:20,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-11 04:36:20,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 116 transitions. [2021-03-11 04:36:20,122 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.6270270270270271 [2021-03-11 04:36:20,122 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 116 transitions. [2021-03-11 04:36:20,122 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 116 transitions. [2021-03-11 04:36:20,122 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-11 04:36:20,122 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 116 transitions. [2021-03-11 04:36:20,123 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 23.2) internal successors, (116), 5 states have internal predecessors, (116), 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 04:36:20,123 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 37.0) internal successors, (222), 6 states have internal predecessors, (222), 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 04:36:20,123 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 37.0) internal successors, (222), 6 states have internal predecessors, (222), 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 04:36:20,124 INFO L185 Difference]: Start difference. First operand has 33 places, 25 transitions, 99 flow. Second operand 5 states and 116 transitions. [2021-03-11 04:36:20,124 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 36 places, 26 transitions, 129 flow [2021-03-11 04:36:20,124 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 26 transitions, 119 flow, removed 0 selfloop flow, removed 4 redundant places. [2021-03-11 04:36:20,125 INFO L241 Difference]: Finished difference. Result has 34 places, 24 transitions, 102 flow [2021-03-11 04:36:20,125 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=37, PETRI_DIFFERENCE_MINUEND_FLOW=83, PETRI_DIFFERENCE_MINUEND_PLACES=28, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=24, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=19, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=102, PETRI_PLACES=34, PETRI_TRANSITIONS=24} [2021-03-11 04:36:20,125 INFO L335 CegarLoopForPetriNet]: 35 programPoint places, -1 predicate places. [2021-03-11 04:36:20,126 INFO L480 AbstractCegarLoop]: Abstraction has has 34 places, 24 transitions, 102 flow [2021-03-11 04:36:20,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 22.8) internal successors, (114), 5 states have internal predecessors, (114), 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 04:36:20,127 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-03-11 04:36:20,127 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-11 04:36:20,127 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-11 04:36:20,127 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-11 04:36:20,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-11 04:36:20,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1296391044, now seen corresponding path program 1 times [2021-03-11 04:36:20,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-11 04:36:20,128 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760618439] [2021-03-11 04:36:20,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-11 04:36:20,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:36:20,144 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:36:20,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-11 04:36:20,148 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-11 04:36:20,150 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-11 04:36:20,150 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-03-11 04:36:20,150 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-11 04:36:20,173 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.03 04:36:20 BasicIcfg [2021-03-11 04:36:20,173 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-11 04:36:20,174 INFO L168 Benchmark]: Toolchain (without parser) took 938.68 ms. Allocated memory is still 343.9 MB. Free memory was 324.3 MB in the beginning and 277.4 MB in the end (delta: 46.9 MB). Peak memory consumption was 48.2 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:20,175 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 343.9 MB. Free memory was 325.3 MB in the beginning and 325.2 MB in the end (delta: 144.5 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-11 04:36:20,176 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.60 ms. Allocated memory is still 343.9 MB. Free memory was 323.8 MB in the beginning and 322.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:20,177 INFO L168 Benchmark]: Boogie Preprocessor took 10.05 ms. Allocated memory is still 343.9 MB. Free memory was 322.3 MB in the beginning and 321.3 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:20,180 INFO L168 Benchmark]: RCFGBuilder took 172.40 ms. Allocated memory is still 343.9 MB. Free memory was 321.3 MB in the beginning and 312.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:20,183 INFO L168 Benchmark]: TraceAbstraction took 729.50 ms. Allocated memory is still 343.9 MB. Free memory was 311.5 MB in the beginning and 277.4 MB in the end (delta: 34.1 MB). Peak memory consumption was 35.6 MB. Max. memory is 16.0 GB. [2021-03-11 04:36:20,186 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 343.9 MB. Free memory was 325.3 MB in the beginning and 325.2 MB in the end (delta: 144.5 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 20.60 ms. Allocated memory is still 343.9 MB. Free memory was 323.8 MB in the beginning and 322.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 10.05 ms. Allocated memory is still 343.9 MB. Free memory was 322.3 MB in the beginning and 321.3 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 172.40 ms. Allocated memory is still 343.9 MB. Free memory was 321.3 MB in the beginning and 312.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.0 GB. * TraceAbstraction took 729.50 ms. Allocated memory is still 343.9 MB. Free memory was 311.5 MB in the beginning and 277.4 MB in the end (delta: 34.1 MB). Peak memory consumption was 35.6 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 35]: assertion can be violated assertion can be violated We found a FailurePath: [L20] 0 x := 1; VAL [x=1] [L22] COND TRUE 0 x < 2 VAL [x=1] [L23] FORK 0 fork x foo(x); VAL [i=1, x=1] [L42] 1 y := 4; VAL [i=1, x=1, y=4] [L24] 0 x := x + 1; VAL [i=1, x=2, y=4] [L22] COND FALSE 0 !(x < 2) VAL [i=1, x=2, y=4] [L26] 0 x := 1; VAL [i=1, x=1, y=4] [L27] JOIN 1 join x; VAL [i=1, x=1, y=4] [L28] COND TRUE 0 x < 3 VAL [i=1, x=1, y=4] [L29] FORK 0 fork x foo(x); VAL [i=1, x=1, y=4] [L30] 0 x := x + 1; VAL [i=1, x=2, y=4] [L28] COND TRUE 0 x < 3 VAL [i=1, x=2, y=4] [L29] FORK 0 fork x foo(x); VAL [i=2, x=2, y=4] [L30] 0 x := x + 1; VAL [i=2, x=3, y=4] [L28] COND FALSE 0 !(x < 3) VAL [i=2, x=3, y=4] [L42] 2 y := 4; VAL [i=2, x=3, y=4] [L33] JOIN 2 join 1; VAL [i=2, x=3, y=4] [L42] 3 y := 4; VAL [i=2, x=3, y=4] [L34] JOIN 3 join 2; VAL [i=2, x=3, y=4] [L35] 0 assert false; VAL [i=2, x=3, y=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 18 locations, 1 error locations. Started 2 CEGAR loops. EmptinessCheckTime: 7.7ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 598.7ms, OverallIterations: 5, TraceHistogramMax: 3, EmptinessCheckTime: 0.0ms, AutomataDifference: 191.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 59.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 6 SDtfs, 20 SDslu, 0 SDs, 0 SdLazy, 63 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 52.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=120occurred in iteration=0, InterpolantAutomatonStates: 13, 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: 11.1ms SsaConstructionTime, 64.3ms SatisfiabilityAnalysisTime, 122.7ms InterpolantComputationTime, 69 NumberOfCodeBlocks, 69 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 29 ConstructedInterpolants, 0 QuantifiedInterpolants, 61 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 17/17 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...