/usr/bin/java -Xmx8000000000 -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-OGIterative-CovSimpl.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-2cf4d3f9dd5fed411db405f577e28237a543b59a-2cf4d3f [2021-08-13 07:42:05,884 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-08-13 07:42:05,885 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-08-13 07:42:05,914 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-08-13 07:42:05,914 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-08-13 07:42:05,917 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-08-13 07:42:05,918 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-08-13 07:42:05,922 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-08-13 07:42:05,924 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-08-13 07:42:05,927 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-08-13 07:42:05,928 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-08-13 07:42:05,929 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-08-13 07:42:05,929 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-08-13 07:42:05,930 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-08-13 07:42:05,932 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-08-13 07:42:05,933 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-08-13 07:42:05,935 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-08-13 07:42:05,936 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-08-13 07:42:05,938 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-08-13 07:42:05,943 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-08-13 07:42:05,944 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-08-13 07:42:05,961 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-08-13 07:42:05,962 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-08-13 07:42:05,963 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-08-13 07:42:05,968 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-08-13 07:42:05,970 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-08-13 07:42:05,971 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-08-13 07:42:05,972 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-08-13 07:42:05,972 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-08-13 07:42:05,973 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-08-13 07:42:05,973 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-08-13 07:42:05,982 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-08-13 07:42:05,982 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-08-13 07:42:05,982 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-08-13 07:42:05,983 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-08-13 07:42:05,983 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-08-13 07:42:05,984 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-OGIterative-CovSimpl.epf [2021-08-13 07:42:05,997 INFO L113 SettingsManager]: Loading preferences was successful [2021-08-13 07:42:05,998 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-08-13 07:42:05,998 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * Use SBE=true [2021-08-13 07:42:05,999 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * sizeof long=4 [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-08-13 07:42:05,999 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-08-13 07:42:06,000 INFO L138 SettingsManager]: * sizeof long double=12 [2021-08-13 07:42:06,000 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-08-13 07:42:06,000 INFO L138 SettingsManager]: * Use constant arrays=true [2021-08-13 07:42:06,000 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-08-13 07:42:06,000 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-08-13 07:42:06,000 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-08-13 07:42:06,000 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-08-13 07:42:06,000 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-08-13 07:42:06,000 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-08-13 07:42:06,001 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * Compute cosets for OwickiGries annotation iteratively=true [2021-08-13 07:42:06,001 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-08-13 07:42:06,002 INFO L138 SettingsManager]: * Simplify away covered predicates in OwickiGries annotation=true WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-08-13 07:42:06,240 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-08-13 07:42:06,254 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-08-13 07:42:06,256 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-08-13 07:42:06,257 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-08-13 07:42:06,260 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-08-13 07:42:06,260 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl [2021-08-13 07:42:06,261 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl' [2021-08-13 07:42:06,280 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-08-13 07:42:06,281 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-08-13 07:42:06,282 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-08-13 07:42:06,282 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-08-13 07:42:06,282 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-08-13 07:42:06,290 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 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,294 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 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,299 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-08-13 07:42:06,300 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-08-13 07:42:06,300 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-08-13 07:42:06,300 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-08-13 07:42:06,305 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,305 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,306 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,306 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,307 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,309 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,309 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (1/1) ... [2021-08-13 07:42:06,310 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-08-13 07:42:06,311 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-08-13 07:42:06,311 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-08-13 07:42:06,312 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-08-13 07:42:06,313 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (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 [2021-08-13 07:42:06,367 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2021-08-13 07:42:06,367 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-08-13 07:42:06,367 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-08-13 07:42:06,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-08-13 07:42:06,367 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-08-13 07:42:06,368 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-08-13 07:42:06,477 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-08-13 07:42:06,477 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-08-13 07:42:06,478 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.08 07:42:06 BoogieIcfgContainer [2021-08-13 07:42:06,478 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-08-13 07:42:06,479 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-08-13 07:42:06,479 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-08-13 07:42:06,481 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-08-13 07:42:06,481 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.08 07:42:06" (1/2) ... [2021-08-13 07:42:06,482 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aa94a47 and model type fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.08 07:42:06, skipping insertion in model container [2021-08-13 07:42:06,482 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.08 07:42:06" (2/2) ... [2021-08-13 07:42:06,483 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_in_loop.bpl [2021-08-13 07:42:06,486 INFO L206 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-08-13 07:42:06,487 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-08-13 07:42:06,487 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-08-13 07:42:06,500 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,500 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,500 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,500 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,502 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,505 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,511 INFO L149 ThreadInstanceAdder]: Constructed 6 joinOtherThreadTransitions. [2021-08-13 07:42:06,526 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-08-13 07:42:06,554 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 07:42:06,554 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 07:42:06,554 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 07:42:06,555 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 07:42:06,555 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 07:42:06,555 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 07:42:06,555 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 07:42:06,555 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 07:42:06,561 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 25 transitions, 78 flow [2021-08-13 07:42:06,574 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-08-13 07:42:06,574 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-08-13 07:42:06,575 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. [2021-08-13 07:42:06,576 INFO L82 GeneralOperation]: Start removeDead. Operand has 27 places, 25 transitions, 78 flow [2021-08-13 07:42:06,578 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 21 places, 16 transitions, 45 flow [2021-08-13 07:42:06,589 INFO L129 PetriNetUnfolder]: 0/10 cut-off events. [2021-08-13 07:42:06,589 INFO L130 PetriNetUnfolder]: For 0/0 co-relation queries the response was YES. [2021-08-13 07:42:06,590 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 07:42:06,590 INFO L266 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2021-08-13 07:42:06,591 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 07:42:06,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 07:42:06,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1921556130, now seen corresponding path program 1 times [2021-08-13 07:42:06,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 07:42:06,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573284112] [2021-08-13 07:42:06,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 07:42:06,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 07:42:06,720 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:06,721 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 07:42:06,734 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:06,735 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 07:42:06,757 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:06,758 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-08-13 07:42:06,759 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-08-13 07:42:06,759 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 07:42:06,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573284112] [2021-08-13 07:42:06,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573284112] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 07:42:06,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 07:42:06,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-08-13 07:42:06,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255943899] [2021-08-13 07:42:06,766 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-08-13 07:42:06,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 07:42:06,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-13 07:42:06,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-08-13 07:42:06,781 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 12 out of 25 [2021-08-13 07:42:06,783 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) [2021-08-13 07:42:06,784 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 07:42:06,784 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 12 of 25 [2021-08-13 07:42:06,784 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 07:42:06,840 INFO L129 PetriNetUnfolder]: 0/18 cut-off events. [2021-08-13 07:42:06,840 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-08-13 07:42:06,841 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. [2021-08-13 07:42:06,842 INFO L132 encePairwiseOnDemand]: 19/25 looper letters, 7 selfloop transitions, 4 changer transitions 1/17 dead transitions. [2021-08-13 07:42:06,842 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 23 places, 17 transitions, 69 flow [2021-08-13 07:42:06,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-13 07:42:06,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-08-13 07:42:06,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 61 transitions. [2021-08-13 07:42:06,852 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.61 [2021-08-13 07:42:06,853 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 61 transitions. [2021-08-13 07:42:06,853 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 61 transitions. [2021-08-13 07:42:06,854 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 07:42:06,856 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 61 transitions. [2021-08-13 07:42:06,857 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) [2021-08-13 07:42:06,861 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) [2021-08-13 07:42:06,862 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) [2021-08-13 07:42:06,862 INFO L348 CegarLoopForPetriNet]: 21 programPoint places, 2 predicate places. [2021-08-13 07:42:06,863 INFO L482 AbstractCegarLoop]: Abstraction has has 23 places, 17 transitions, 69 flow [2021-08-13 07:42:06,863 INFO L483 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) [2021-08-13 07:42:06,863 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 07:42:06,863 INFO L266 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 07:42:06,863 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-08-13 07:42:06,863 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 07:42:06,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 07:42:06,865 INFO L82 PathProgramCache]: Analyzing trace with hash -29839023, now seen corresponding path program 1 times [2021-08-13 07:42:06,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 07:42:06,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1058431889] [2021-08-13 07:42:06,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 07:42:06,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 07:42:06,887 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 07:42:06,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 07:42:06,901 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 07:42:06,916 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 07:42:06,917 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 07:42:06,918 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-08-13 07:42:06,918 WARN L235 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-08-13 07:42:06,918 INFO L445 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-08-13 07:42:06,926 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,926 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,927 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,927 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,927 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,927 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,927 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,927 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,928 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,930 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,931 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,932 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-08-13 07:42:06,943 INFO L149 ThreadInstanceAdder]: Constructed 12 joinOtherThreadTransitions. [2021-08-13 07:42:06,944 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-08-13 07:42:06,947 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-08-13 07:42:06,947 INFO L379 AbstractCegarLoop]: Hoare is false [2021-08-13 07:42:06,947 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-08-13 07:42:06,947 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-08-13 07:42:06,947 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-08-13 07:42:06,947 INFO L383 AbstractCegarLoop]: Difference is false [2021-08-13 07:42:06,947 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-08-13 07:42:06,948 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-08-13 07:42:06,949 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 37 places, 37 transitions, 134 flow [2021-08-13 07:42:06,981 INFO L129 PetriNetUnfolder]: 14/111 cut-off events. [2021-08-13 07:42:06,981 INFO L130 PetriNetUnfolder]: For 40/40 co-relation queries the response was YES. [2021-08-13 07:42:06,983 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. [2021-08-13 07:42:06,984 INFO L82 GeneralOperation]: Start removeDead. Operand has 37 places, 37 transitions, 134 flow [2021-08-13 07:42:06,985 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 35 places, 33 transitions, 120 flow [2021-08-13 07:42:06,990 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-08-13 07:42:06,990 INFO L130 PetriNetUnfolder]: For 3/3 co-relation queries the response was YES. [2021-08-13 07:42:06,990 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 07:42:06,990 INFO L266 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1] [2021-08-13 07:42:06,990 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 07:42:06,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 07:42:06,991 INFO L82 PathProgramCache]: Analyzing trace with hash -889250761, now seen corresponding path program 1 times [2021-08-13 07:42:06,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 07:42:06,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909505048] [2021-08-13 07:42:06,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 07:42:07,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 07:42:07,018 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:07,020 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 07:42:07,023 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:07,023 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 07:42:07,027 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:07,028 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-08-13 07:42:07,028 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-13 07:42:07,028 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 07:42:07,028 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909505048] [2021-08-13 07:42:07,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909505048] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 07:42:07,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 07:42:07,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-08-13 07:42:07,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088363846] [2021-08-13 07:42:07,029 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-08-13 07:42:07,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 07:42:07,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-08-13 07:42:07,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-08-13 07:42:07,032 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 37 [2021-08-13 07:42:07,033 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) [2021-08-13 07:42:07,034 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 07:42:07,034 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 37 [2021-08-13 07:42:07,034 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 07:42:07,068 INFO L129 PetriNetUnfolder]: 1/32 cut-off events. [2021-08-13 07:42:07,068 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-08-13 07:42:07,068 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. [2021-08-13 07:42:07,068 INFO L132 encePairwiseOnDemand]: 30/37 looper letters, 10 selfloop transitions, 4 changer transitions 2/28 dead transitions. [2021-08-13 07:42:07,068 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 33 places, 28 transitions, 118 flow [2021-08-13 07:42:07,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-08-13 07:42:07,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-08-13 07:42:07,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 97 transitions. [2021-08-13 07:42:07,071 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.6554054054054054 [2021-08-13 07:42:07,072 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 97 transitions. [2021-08-13 07:42:07,072 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 97 transitions. [2021-08-13 07:42:07,072 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 07:42:07,072 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 97 transitions. [2021-08-13 07:42:07,074 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) [2021-08-13 07:42:07,075 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) [2021-08-13 07:42:07,075 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) [2021-08-13 07:42:07,075 INFO L348 CegarLoopForPetriNet]: 35 programPoint places, -2 predicate places. [2021-08-13 07:42:07,075 INFO L482 AbstractCegarLoop]: Abstraction has has 33 places, 28 transitions, 118 flow [2021-08-13 07:42:07,076 INFO L483 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) [2021-08-13 07:42:07,076 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 07:42:07,076 INFO L266 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 07:42:07,076 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-08-13 07:42:07,076 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 07:42:07,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 07:42:07,076 INFO L82 PathProgramCache]: Analyzing trace with hash 448932334, now seen corresponding path program 1 times [2021-08-13 07:42:07,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 07:42:07,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221290663] [2021-08-13 07:42:07,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 07:42:07,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-08-13 07:42:07,113 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:07,113 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-08-13 07:42:07,114 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:07,114 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 07:42:07,116 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:07,117 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 07:42:07,120 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:07,120 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-08-13 07:42:07,124 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-08-13 07:42:07,124 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-08-13 07:42:07,124 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-08-13 07:42:07,124 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-08-13 07:42:07,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221290663] [2021-08-13 07:42:07,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221290663] provided 1 perfect and 0 imperfect interpolant sequences [2021-08-13 07:42:07,125 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-08-13 07:42:07,125 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-08-13 07:42:07,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988677853] [2021-08-13 07:42:07,125 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-08-13 07:42:07,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-08-13 07:42:07,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-08-13 07:42:07,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-08-13 07:42:07,126 INFO L513 CegarLoopForPetriNet]: Number of universal loopers: 20 out of 37 [2021-08-13 07:42:07,126 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 33 places, 28 transitions, 118 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) [2021-08-13 07:42:07,126 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-08-13 07:42:07,127 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 20 of 37 [2021-08-13 07:42:07,127 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-08-13 07:42:07,172 INFO L129 PetriNetUnfolder]: 1/30 cut-off events. [2021-08-13 07:42:07,172 INFO L130 PetriNetUnfolder]: For 7/7 co-relation queries the response was YES. [2021-08-13 07:42:07,172 INFO L84 FinitePrefix]: Finished finitePrefix Result has 86 conditions, 30 events. 1/30 cut-off events. For 7/7 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 29 event pairs, 0 based on Foata normal form. 0/27 useless extension candidates. Maximal degree in co-relation 79. Up to 10 conditions per place. [2021-08-13 07:42:07,172 INFO L132 encePairwiseOnDemand]: 30/37 looper letters, 9 selfloop transitions, 5 changer transitions 3/28 dead transitions. [2021-08-13 07:42:07,173 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 36 places, 28 transitions, 150 flow [2021-08-13 07:42:07,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-08-13 07:42:07,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-08-13 07:42:07,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 118 transitions. [2021-08-13 07:42:07,178 INFO L558 CegarLoopForPetriNet]: DFA transition density 0.6378378378378379 [2021-08-13 07:42:07,178 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 118 transitions. [2021-08-13 07:42:07,178 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 118 transitions. [2021-08-13 07:42:07,178 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-08-13 07:42:07,178 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 118 transitions. [2021-08-13 07:42:07,180 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 23.6) internal successors, (118), 5 states have internal predecessors, (118), 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) [2021-08-13 07:42:07,180 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) [2021-08-13 07:42:07,181 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) [2021-08-13 07:42:07,181 INFO L348 CegarLoopForPetriNet]: 35 programPoint places, 1 predicate places. [2021-08-13 07:42:07,181 INFO L482 AbstractCegarLoop]: Abstraction has has 36 places, 28 transitions, 150 flow [2021-08-13 07:42:07,182 INFO L483 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) [2021-08-13 07:42:07,182 INFO L258 CegarLoopForPetriNet]: Found error trace [2021-08-13 07:42:07,182 INFO L266 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-08-13 07:42:07,182 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-08-13 07:42:07,182 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-08-13 07:42:07,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-08-13 07:42:07,183 INFO L82 PathProgramCache]: Analyzing trace with hash -1599294088, now seen corresponding path program 1 times [2021-08-13 07:42:07,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-08-13 07:42:07,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069488691] [2021-08-13 07:42:07,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-08-13 07:42:07,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 07:42:07,204 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 07:42:07,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-08-13 07:42:07,220 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-08-13 07:42:07,222 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-08-13 07:42:07,222 INFO L651 BasicCegarLoop]: Counterexample might be feasible [2021-08-13 07:42:07,223 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-08-13 07:42:07,226 INFO L239 ceAbstractionStarter]: Analysis of concurrent program completed with 2 thread instances [2021-08-13 07:42:07,234 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.08 07:42:07 BasicIcfg [2021-08-13 07:42:07,235 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-08-13 07:42:07,236 INFO L168 Benchmark]: Toolchain (without parser) took 953.97 ms. Allocated memory is still 185.6 MB. Free memory was 166.2 MB in the beginning and 93.0 MB in the end (delta: 73.3 MB). Peak memory consumption was 74.4 MB. Max. memory is 8.0 GB. [2021-08-13 07:42:07,236 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.10 ms. Allocated memory is still 185.6 MB. Free memory is still 167.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-08-13 07:42:07,236 INFO L168 Benchmark]: Boogie Procedure Inliner took 17.42 ms. Allocated memory is still 185.6 MB. Free memory was 166.0 MB in the beginning and 164.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-08-13 07:42:07,237 INFO L168 Benchmark]: Boogie Preprocessor took 9.75 ms. Allocated memory is still 185.6 MB. Free memory was 164.7 MB in the beginning and 163.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-08-13 07:42:07,237 INFO L168 Benchmark]: RCFGBuilder took 167.53 ms. Allocated memory is still 185.6 MB. Free memory was 163.7 MB in the beginning and 153.6 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-08-13 07:42:07,237 INFO L168 Benchmark]: TraceAbstraction took 755.25 ms. Allocated memory is still 185.6 MB. Free memory was 153.2 MB in the beginning and 93.0 MB in the end (delta: 60.2 MB). Peak memory consumption was 60.8 MB. Max. memory is 8.0 GB. [2021-08-13 07:42:07,248 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.10 ms. Allocated memory is still 185.6 MB. Free memory is still 167.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 17.42 ms. Allocated memory is still 185.6 MB. Free memory was 166.0 MB in the beginning and 164.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 9.75 ms. Allocated memory is still 185.6 MB. Free memory was 164.7 MB in the beginning and 163.7 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 167.53 ms. Allocated memory is still 185.6 MB. Free memory was 163.7 MB in the beginning and 153.6 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 755.25 ms. Allocated memory is still 185.6 MB. Free memory was 153.2 MB in the beginning and 93.0 MB in the end (delta: 60.2 MB). Peak memory consumption was 60.8 MB. Max. memory is 8.0 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] [L24] 0 x := x + 1; VAL [i=1, x=2] [L22] COND FALSE 0 !(x < 2) VAL [i=1, x=2] [L26] 0 x := 1; VAL [i=1, x=1] [L42] 1 y := 4; 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] [L42] 3 y := 4; 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] [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 with 1 thread instances CFG has 4 procedures, 26 locations, 3 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 11.2ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 367.2ms, OverallIterations: 2, TraceHistogramMax: 2, EmptinessCheckTime: 0.0ms, AutomataDifference: 90.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 23.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 2 SDtfs, 5 SDslu, 0 SDs, 0 SdLazy, 17 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 27.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 31.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=69occurred in iteration=1, InterpolantAutomatonStates: 4, 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: 6.8ms SsaConstructionTime, 29.5ms SatisfiabilityAnalysisTime, 68.6ms InterpolantComputationTime, 20 NumberOfCodeBlocks, 20 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 5 ConstructedInterpolants, 0 QuantifiedInterpolants, 13 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 2/2 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 - StatisticsResult: Ultimate Automizer benchmark data with 2 thread instances CFG has 6 procedures, 32 locations, 3 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 4.9ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 276.6ms, OverallIterations: 3, TraceHistogramMax: 3, EmptinessCheckTime: 0.0ms, AutomataDifference: 100.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 37.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 4 SDtfs, 13 SDslu, 0 SDs, 0 SdLazy, 49 SolverSat, 13 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 38.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=150occurred in iteration=2, InterpolantAutomatonStates: 9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 4.4ms SsaConstructionTime, 50.8ms SatisfiabilityAnalysisTime, 38.6ms InterpolantComputationTime, 49 NumberOfCodeBlocks, 49 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 24 ConstructedInterpolants, 0 QuantifiedInterpolants, 48 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 15/15 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...