/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 0.2.1-0e22065b97d0a1f8b3904e080cebe0f05e88d2b7-0e22065 [2021-06-10 14:37:44,481 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-10 14:37:44,482 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-10 14:37:44,500 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-06-10 14:37:44,501 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-06-10 14:37:44,501 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-06-10 14:37:44,502 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-06-10 14:37:44,504 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-06-10 14:37:44,505 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-06-10 14:37:44,505 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-06-10 14:37:44,506 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-06-10 14:37:44,507 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-06-10 14:37:44,507 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-06-10 14:37:44,507 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-06-10 14:37:44,508 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-06-10 14:37:44,509 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-06-10 14:37:44,509 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-06-10 14:37:44,510 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-06-10 14:37:44,511 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-06-10 14:37:44,512 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-06-10 14:37:44,513 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-06-10 14:37:44,514 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-06-10 14:37:44,514 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-06-10 14:37:44,515 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-06-10 14:37:44,516 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-06-10 14:37:44,521 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-06-10 14:37:44,521 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-06-10 14:37:44,522 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-06-10 14:37:44,522 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 [2021-06-10 14:37:44,536 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-10 14:37:44,537 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-10 14:37:44,538 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-10 14:37:44,538 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-10 14:37:44,538 INFO L138 SettingsManager]: * Use SBE=true [2021-06-10 14:37:44,538 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-10 14:37:44,538 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-10 14:37:44,538 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-10 14:37:44,538 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-10 14:37:44,539 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-10 14:37:44,539 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-10 14:37:44,539 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-10 14:37:44,539 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-10 14:37:44,539 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-10 14:37:44,539 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-10 14:37:44,539 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-10 14:37:44,539 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-10 14:37:44,540 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-10 14:37:44,540 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-10 14:37:44,540 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-10 14:37:44,540 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-10 14:37:44,540 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-10 14:37:44,540 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-10 14:37:44,540 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-10 14:37:44,541 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-10 14:37:44,541 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-10 14:37:44,541 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-10 14:37:44,541 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-10 14:37:44,541 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-06-10 14:37:44,541 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-10 14:37:44,766 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-10 14:37:44,788 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-10 14:37:44,790 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-10 14:37:44,791 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-10 14:37:44,792 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-10 14:37:44,792 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl [2021-06-10 14:37:44,793 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl' [2021-06-10 14:37:44,827 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-10 14:37:44,829 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-10 14:37:44,830 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-10 14:37:44,830 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-10 14:37:44,830 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-10 14:37:44,838 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 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,842 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 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,847 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-10 14:37:44,848 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-10 14:37:44,848 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-10 14:37:44,849 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-10 14:37:44,853 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,854 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,855 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,855 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,857 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,859 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,860 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (1/1) ... [2021-06-10 14:37:44,860 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-10 14:37:44,861 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-10 14:37:44,861 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-10 14:37:44,861 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-10 14:37:44,863 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (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 [2021-06-10 14:37:44,908 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2021-06-10 14:37:44,908 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-06-10 14:37:44,909 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-06-10 14:37:44,910 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-10 14:37:44,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-10 14:37:44,911 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-06-10 14:37:45,003 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-10 14:37:45,004 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-06-10 14:37:45,005 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.06 02:37:45 BoogieIcfgContainer [2021-06-10 14:37:45,005 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-10 14:37:45,006 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-10 14:37:45,006 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-10 14:37:45,008 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-10 14:37:45,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 10.06 02:37:44" (1/2) ... [2021-06-10 14:37:45,008 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2604066f and model type fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.06 02:37:45, skipping insertion in model container [2021-06-10 14:37:45,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.06 02:37:45" (2/2) ... [2021-06-10 14:37:45,009 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_in_loop.bpl [2021-06-10 14:37:45,013 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-10 14:37:45,015 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-06-10 14:37:45,016 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-10 14:37:45,041 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,042 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,042 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,042 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,044 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,047 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,054 INFO L149 ThreadInstanceAdder]: Constructed 6 joinOtherThreadTransitions. [2021-06-10 14:37:45,066 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-06-10 14:37:45,080 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-06-10 14:37:45,080 INFO L377 AbstractCegarLoop]: Hoare is false [2021-06-10 14:37:45,081 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-10 14:37:45,081 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-10 14:37:45,081 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-10 14:37:45,081 INFO L381 AbstractCegarLoop]: Difference is false [2021-06-10 14:37:45,081 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-10 14:37:45,081 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-06-10 14:37:45,087 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 25 transitions, 78 flow [2021-06-10 14:37:45,101 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-06-10 14:37:45,101 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-06-10 14:37:45,102 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. [2021-06-10 14:37:45,102 INFO L82 GeneralOperation]: Start removeDead. Operand has 27 places, 25 transitions, 78 flow [2021-06-10 14:37:45,105 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 21 places, 16 transitions, 45 flow [2021-06-10 14:37:45,108 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-06-10 14:37:45,108 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-06-10 14:37:45,108 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-06-10 14:37:45,109 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2021-06-10 14:37:45,109 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-10 14:37:45,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-10 14:37:45,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1921556130, now seen corresponding path program 1 times [2021-06-10 14:37:45,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-10 14:37:45,124 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798927987] [2021-06-10 14:37:45,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-10 14:37:45,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-10 14:37:45,250 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,250 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-10 14:37:45,268 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,268 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-10 14:37:45,283 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,284 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-10 14:37:45,285 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-10 14:37:45,285 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798927987] [2021-06-10 14:37:45,286 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-10 14:37:45,286 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-10 14:37:45,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953832329] [2021-06-10 14:37:45,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-10 14:37:45,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-10 14:37:45,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-10 14:37:45,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-10 14:37:45,304 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-06-10 14:37:45,306 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) [2021-06-10 14:37:45,306 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-10 14:37:45,306 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-06-10 14:37:45,307 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-10 14:37:45,357 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-06-10 14:37:45,357 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-06-10 14:37:45,357 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. [2021-06-10 14:37:45,358 INFO L132 encePairwiseOnDemand]: 19/25 looper letters, 7 selfloop transitions, 4 changer transitions 1/17 dead transitions. [2021-06-10 14:37:45,358 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 17 transitions, 69 flow [2021-06-10 14:37:45,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-10 14:37:45,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-06-10 14:37:45,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 61 transitions. [2021-06-10 14:37:45,367 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.61 [2021-06-10 14:37:45,367 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 61 transitions. [2021-06-10 14:37:45,367 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 61 transitions. [2021-06-10 14:37:45,368 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-10 14:37:45,370 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 61 transitions. [2021-06-10 14:37:45,372 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) [2021-06-10 14:37:45,378 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) [2021-06-10 14:37:45,378 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) [2021-06-10 14:37:45,380 INFO L185 Difference]: Start difference. First operand has 21 places, 16 transitions, 45 flow. Second operand 4 states and 61 transitions. [2021-06-10 14:37:45,381 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 23 places, 17 transitions, 69 flow [2021-06-10 14:37:45,385 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 21 places, 17 transitions, 65 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-10 14:37:45,387 INFO L241 Difference]: Finished difference. Result has 23 places, 15 transitions, 56 flow [2021-06-10 14:37:45,388 INFO L326 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} [2021-06-10 14:37:45,389 INFO L343 CegarLoopForPetriNet]: 21 programPoint places, 2 predicate places. [2021-06-10 14:37:45,389 INFO L480 AbstractCegarLoop]: Abstraction has has 23 places, 15 transitions, 56 flow [2021-06-10 14:37:45,389 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) [2021-06-10 14:37:45,389 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-06-10 14:37:45,389 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-10 14:37:45,389 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-06-10 14:37:45,389 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-10 14:37:45,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-10 14:37:45,392 INFO L82 PathProgramCache]: Analyzing trace with hash -29839023, now seen corresponding path program 1 times [2021-06-10 14:37:45,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-10 14:37:45,392 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145547165] [2021-06-10 14:37:45,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-10 14:37:45,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-10 14:37:45,415 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-10 14:37:45,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-10 14:37:45,430 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-10 14:37:45,444 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-06-10 14:37:45,444 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-06-10 14:37:45,445 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-06-10 14:37:45,446 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-06-10 14:37:45,446 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-06-10 14:37:45,455 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,456 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,456 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,456 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,456 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,457 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,457 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,457 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,457 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,459 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,460 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,461 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-10 14:37:45,472 INFO L149 ThreadInstanceAdder]: Constructed 12 joinOtherThreadTransitions. [2021-06-10 14:37:45,472 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-06-10 14:37:45,483 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-06-10 14:37:45,484 INFO L377 AbstractCegarLoop]: Hoare is false [2021-06-10 14:37:45,484 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-10 14:37:45,484 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-10 14:37:45,484 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-10 14:37:45,484 INFO L381 AbstractCegarLoop]: Difference is false [2021-06-10 14:37:45,484 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-10 14:37:45,484 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-06-10 14:37:45,485 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 37 places, 37 transitions, 134 flow [2021-06-10 14:37:45,519 INFO L129 PetriNetUnfolder]: 14/111 cut-off events. [2021-06-10 14:37:45,519 INFO L130 PetriNetUnfolder]: For 40/40 co-relation queries the response was YES. [2021-06-10 14:37:45,521 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. [2021-06-10 14:37:45,521 INFO L82 GeneralOperation]: Start removeDead. Operand has 37 places, 37 transitions, 134 flow [2021-06-10 14:37:45,522 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 35 places, 33 transitions, 120 flow [2021-06-10 14:37:45,529 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-06-10 14:37:45,529 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-06-10 14:37:45,530 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-06-10 14:37:45,530 INFO L263 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1] [2021-06-10 14:37:45,530 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-10 14:37:45,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-10 14:37:45,531 INFO L82 PathProgramCache]: Analyzing trace with hash -889250761, now seen corresponding path program 1 times [2021-06-10 14:37:45,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-10 14:37:45,533 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975837123] [2021-06-10 14:37:45,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-10 14:37:45,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-10 14:37:45,551 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,555 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-10 14:37:45,558 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,559 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-10 14:37:45,564 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,564 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-10 14:37:45,565 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-10 14:37:45,565 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975837123] [2021-06-10 14:37:45,565 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-10 14:37:45,565 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-10 14:37:45,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254904217] [2021-06-10 14:37:45,566 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-10 14:37:45,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-10 14:37:45,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-10 14:37:45,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-06-10 14:37:45,569 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 37 [2021-06-10 14:37:45,571 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) [2021-06-10 14:37:45,571 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-10 14:37:45,571 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 37 [2021-06-10 14:37:45,571 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-10 14:37:45,610 INFO L129 PetriNetUnfolder]: 1/32 cut-off events. [2021-06-10 14:37:45,611 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-06-10 14:37:45,611 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. [2021-06-10 14:37:45,611 INFO L132 encePairwiseOnDemand]: 30/37 looper letters, 10 selfloop transitions, 4 changer transitions 2/28 dead transitions. [2021-06-10 14:37:45,611 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 28 transitions, 118 flow [2021-06-10 14:37:45,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-10 14:37:45,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-06-10 14:37:45,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 97 transitions. [2021-06-10 14:37:45,614 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6554054054054054 [2021-06-10 14:37:45,614 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 97 transitions. [2021-06-10 14:37:45,615 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 97 transitions. [2021-06-10 14:37:45,615 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-10 14:37:45,615 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 97 transitions. [2021-06-10 14:37:45,617 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) [2021-06-10 14:37:45,618 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) [2021-06-10 14:37:45,618 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) [2021-06-10 14:37:45,618 INFO L185 Difference]: Start difference. First operand has 35 places, 33 transitions, 120 flow. Second operand 4 states and 97 transitions. [2021-06-10 14:37:45,618 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 33 places, 28 transitions, 118 flow [2021-06-10 14:37:45,620 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 31 places, 28 transitions, 114 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-10 14:37:45,621 INFO L241 Difference]: Finished difference. Result has 33 places, 25 transitions, 99 flow [2021-06-10 14:37:45,621 INFO L326 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} [2021-06-10 14:37:45,621 INFO L343 CegarLoopForPetriNet]: 35 programPoint places, -2 predicate places. [2021-06-10 14:37:45,621 INFO L480 AbstractCegarLoop]: Abstraction has has 33 places, 25 transitions, 99 flow [2021-06-10 14:37:45,622 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) [2021-06-10 14:37:45,622 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-06-10 14:37:45,622 INFO L263 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-10 14:37:45,622 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-06-10 14:37:45,622 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-10 14:37:45,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-10 14:37:45,622 INFO L82 PathProgramCache]: Analyzing trace with hash 448932334, now seen corresponding path program 1 times [2021-06-10 14:37:45,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-10 14:37:45,623 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102103718] [2021-06-10 14:37:45,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-10 14:37:45,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-10 14:37:45,637 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,638 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-10 14:37:45,638 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,639 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-10 14:37:45,642 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,642 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-10 14:37:45,645 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,646 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-10 14:37:45,650 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-10 14:37:45,650 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-10 14:37:45,650 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-06-10 14:37:45,651 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102103718] [2021-06-10 14:37:45,651 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-10 14:37:45,651 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-06-10 14:37:45,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24642631] [2021-06-10 14:37:45,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-06-10 14:37:45,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-10 14:37:45,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-06-10 14:37:45,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-06-10 14:37:45,653 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 37 [2021-06-10 14:37:45,653 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) [2021-06-10 14:37:45,653 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-10 14:37:45,654 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 37 [2021-06-10 14:37:45,654 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-10 14:37:45,709 INFO L129 PetriNetUnfolder]: 1/27 cut-off events. [2021-06-10 14:37:45,709 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-06-10 14:37:45,710 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. [2021-06-10 14:37:45,710 INFO L132 encePairwiseOnDemand]: 31/37 looper letters, 9 selfloop transitions, 5 changer transitions 1/26 dead transitions. [2021-06-10 14:37:45,710 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 36 places, 26 transitions, 129 flow [2021-06-10 14:37:45,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-06-10 14:37:45,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-06-10 14:37:45,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 116 transitions. [2021-06-10 14:37:45,711 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6270270270270271 [2021-06-10 14:37:45,711 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 116 transitions. [2021-06-10 14:37:45,712 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 116 transitions. [2021-06-10 14:37:45,712 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-10 14:37:45,712 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 116 transitions. [2021-06-10 14:37:45,712 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) [2021-06-10 14:37:45,713 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) [2021-06-10 14:37:45,713 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) [2021-06-10 14:37:45,713 INFO L185 Difference]: Start difference. First operand has 33 places, 25 transitions, 99 flow. Second operand 5 states and 116 transitions. [2021-06-10 14:37:45,713 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 36 places, 26 transitions, 129 flow [2021-06-10 14:37:45,714 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 32 places, 26 transitions, 119 flow, removed 0 selfloop flow, removed 4 redundant places. [2021-06-10 14:37:45,714 INFO L241 Difference]: Finished difference. Result has 34 places, 24 transitions, 102 flow [2021-06-10 14:37:45,715 INFO L326 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} [2021-06-10 14:37:45,715 INFO L343 CegarLoopForPetriNet]: 35 programPoint places, -1 predicate places. [2021-06-10 14:37:45,715 INFO L480 AbstractCegarLoop]: Abstraction has has 34 places, 24 transitions, 102 flow [2021-06-10 14:37:45,715 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) [2021-06-10 14:37:45,715 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-06-10 14:37:45,715 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-10 14:37:45,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-06-10 14:37:45,716 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-10 14:37:45,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-10 14:37:45,716 INFO L82 PathProgramCache]: Analyzing trace with hash -1296391044, now seen corresponding path program 1 times [2021-06-10 14:37:45,716 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-10 14:37:45,716 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49019345] [2021-06-10 14:37:45,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-10 14:37:45,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-10 14:37:45,733 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-10 14:37:45,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-10 14:37:45,749 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-10 14:37:45,751 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-06-10 14:37:45,751 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-06-10 14:37:45,751 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-06-10 14:37:45,771 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.06 02:37:45 BasicIcfg [2021-06-10 14:37:45,771 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-06-10 14:37:45,772 INFO L168 Benchmark]: Toolchain (without parser) took 942.89 ms. Allocated memory is still 343.9 MB. Free memory was 324.2 MB in the beginning and 277.0 MB in the end (delta: 47.2 MB). Peak memory consumption was 48.6 MB. Max. memory is 16.0 GB. [2021-06-10 14:37:45,773 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.68 ms. Allocated memory is still 343.9 MB. Free memory was 325.2 MB in the beginning and 325.1 MB in the end (delta: 76.3 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-06-10 14:37:45,774 INFO L168 Benchmark]: Boogie Procedure Inliner took 16.99 ms. Allocated memory is still 343.9 MB. Free memory was 324.1 MB in the beginning and 322.7 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-06-10 14:37:45,774 INFO L168 Benchmark]: Boogie Preprocessor took 11.94 ms. Allocated memory is still 343.9 MB. Free memory was 322.7 MB in the beginning and 321.7 MB in the end (delta: 922.8 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-06-10 14:37:45,779 INFO L168 Benchmark]: RCFGBuilder took 143.91 ms. Allocated memory is still 343.9 MB. Free memory was 321.7 MB in the beginning and 312.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.0 GB. [2021-06-10 14:37:45,779 INFO L168 Benchmark]: TraceAbstraction took 765.23 ms. Allocated memory is still 343.9 MB. Free memory was 312.0 MB in the beginning and 277.0 MB in the end (delta: 35.0 MB). Peak memory consumption was 36.0 MB. Max. memory is 16.0 GB. [2021-06-10 14:37:45,780 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 0.68 ms. Allocated memory is still 343.9 MB. Free memory was 325.2 MB in the beginning and 325.1 MB in the end (delta: 76.3 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 16.99 ms. Allocated memory is still 343.9 MB. Free memory was 324.1 MB in the beginning and 322.7 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 11.94 ms. Allocated memory is still 343.9 MB. Free memory was 322.7 MB in the beginning and 321.7 MB in the end (delta: 922.8 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 143.91 ms. Allocated memory is still 343.9 MB. Free memory was 321.7 MB in the beginning and 312.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.0 GB. * TraceAbstraction took 765.23 ms. Allocated memory is still 343.9 MB. Free memory was 312.0 MB in the beginning and 277.0 MB in the end (delta: 35.0 MB). Peak memory consumption was 36.0 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: 10.1ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 637.0ms, OverallIterations: 5, TraceHistogramMax: 3, EmptinessCheckTime: 0.0ms, AutomataDifference: 206.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 62.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 6 SDtfs, 20 SDslu, 0 SDs, 0 SdLazy, 63 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 70.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.2ms 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: 9.9ms SsaConstructionTime, 63.6ms SatisfiabilityAnalysisTime, 103.2ms 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...