/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.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/fork_unchanged_local_variables2.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-9bbddad6b14272d9691b7fb6f1c011d15ab18596-9bbddad [2021-06-13 08:22:22,159 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-13 08:22:22,160 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-13 08:22:22,178 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-06-13 08:22:22,218 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 [2021-06-13 08:22:22,238 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-13 08:22:22,238 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-13 08:22:22,240 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-13 08:22:22,240 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-13 08:22:22,240 INFO L138 SettingsManager]: * Use SBE=true [2021-06-13 08:22:22,240 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-13 08:22:22,240 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-13 08:22:22,240 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-13 08:22:22,240 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-13 08:22:22,241 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-13 08:22:22,241 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-13 08:22:22,241 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-13 08:22:22,241 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-13 08:22:22,242 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-13 08:22:22,242 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-13 08:22:22,242 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-13 08:22:22,242 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-13 08:22:22,242 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-13 08:22:22,242 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-13 08:22:22,242 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-13 08:22:22,242 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-13 08:22:22,242 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-13 08:22:22,243 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-13 08:22:22,243 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-13 08:22:22,243 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-13 08:22:22,243 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-13 08:22:22,243 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-13 08:22:22,243 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-13 08:22:22,243 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-06-13 08:22:22,243 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-13 08:22:22,478 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-13 08:22:22,495 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-13 08:22:22,497 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-13 08:22:22,498 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-13 08:22:22,499 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-13 08:22:22,500 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_unchanged_local_variables2.bpl [2021-06-13 08:22:22,500 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_unchanged_local_variables2.bpl' [2021-06-13 08:22:22,530 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-13 08:22:22,532 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-13 08:22:22,533 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-13 08:22:22,533 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-13 08:22:22,533 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-13 08:22:22,541 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,545 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,551 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-13 08:22:22,552 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-13 08:22:22,552 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-13 08:22:22,552 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-13 08:22:22,557 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,558 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,558 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,558 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,560 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,562 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,562 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/1) ... [2021-06-13 08:22:22,563 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-13 08:22:22,564 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-13 08:22:22,564 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-13 08:22:22,564 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-13 08:22:22,565 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (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 [2021-06-13 08:22:22,625 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2021-06-13 08:22:22,626 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-06-13 08:22:22,626 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-06-13 08:22:22,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-13 08:22:22,627 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-13 08:22:22,628 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-06-13 08:22:22,733 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-13 08:22:22,733 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-06-13 08:22:22,734 INFO L202 PluginConnector]: Adding new model fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.06 08:22:22 BoogieIcfgContainer [2021-06-13 08:22:22,734 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-13 08:22:22,735 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-13 08:22:22,737 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-13 08:22:22,740 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-13 08:22:22,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 13.06 08:22:22" (1/2) ... [2021-06-13 08:22:22,741 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@489bd1d2 and model type fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.06 08:22:22, skipping insertion in model container [2021-06-13 08:22:22,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.06 08:22:22" (2/2) ... [2021-06-13 08:22:22,742 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_unchanged_local_variables2.bpl [2021-06-13 08:22:22,748 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-13 08:22:22,748 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-06-13 08:22:22,749 INFO L471 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-13 08:22:22,767 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:22,767 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_res not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:22,768 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:22,768 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_res not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:22,771 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:22,771 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_res not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-13 08:22:22,777 INFO L149 ThreadInstanceAdder]: Constructed 1 joinOtherThreadTransitions. [2021-06-13 08:22:22,791 INFO L255 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-06-13 08:22:22,803 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-13 08:22:22,804 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-13 08:22:22,804 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-13 08:22:22,804 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-13 08:22:22,804 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-13 08:22:22,804 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-13 08:22:22,804 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-13 08:22:22,804 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-06-13 08:22:22,810 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 18 places, 16 transitions, 40 flow [2021-06-13 08:22:22,820 INFO L129 PetriNetUnfolder]: 2/15 cut-off events. [2021-06-13 08:22:22,821 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-06-13 08:22:22,822 INFO L84 FinitePrefix]: Finished finitePrefix Result has 20 conditions, 15 events. 2/15 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 10 event pairs, 0 based on Foata normal form. 0/12 useless extension candidates. Maximal degree in co-relation 5. Up to 2 conditions per place. [2021-06-13 08:22:22,822 INFO L82 GeneralOperation]: Start removeDead. Operand has 18 places, 16 transitions, 40 flow [2021-06-13 08:22:22,824 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 15 places, 13 transitions, 32 flow [2021-06-13 08:22:22,827 INFO L129 PetriNetUnfolder]: 2/12 cut-off events. [2021-06-13 08:22:22,827 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-06-13 08:22:22,828 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:22,828 INFO L255 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:22,828 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:22,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:22,831 INFO L82 PathProgramCache]: Analyzing trace with hash -107683713, now seen corresponding path program 1 times [2021-06-13 08:22:22,836 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:22,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404107853] [2021-06-13 08:22:22,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:22,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-13 08:22:22,909 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:22,921 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:22,922 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:22,923 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-06-13 08:22:22,936 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-06-13 08:22:22,937 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-06-13 08:22:22,938 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-13 08:22:22,938 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-13 08:22:22,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404107853] [2021-06-13 08:22:22,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404107853] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-13 08:22:22,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-13 08:22:22,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-13 08:22:22,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690294831] [2021-06-13 08:22:22,944 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-13 08:22:22,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-13 08:22:22,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-13 08:22:22,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-13 08:22:22,968 INFO L500 CegarLoopForPetriNet]: Number of universal loopers: 8 out of 16 [2021-06-13 08:22:22,971 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 15 places, 13 transitions, 32 flow. Second operand has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 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) [2021-06-13 08:22:22,972 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-06-13 08:22:22,972 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 8 of 16 [2021-06-13 08:22:22,972 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-06-13 08:22:23,012 INFO L129 PetriNetUnfolder]: 2/21 cut-off events. [2021-06-13 08:22:23,012 INFO L130 PetriNetUnfolder]: For 6/6 co-relation queries the response was YES. [2021-06-13 08:22:23,013 INFO L84 FinitePrefix]: Finished finitePrefix Result has 42 conditions, 21 events. 2/21 cut-off events. For 6/6 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 7 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 8. Up to 7 conditions per place. [2021-06-13 08:22:23,013 INFO L132 encePairwiseOnDemand]: 12/16 looper letters, 9 selfloop transitions, 3 changer transitions 0/18 dead transitions. [2021-06-13 08:22:23,014 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 17 places, 18 transitions, 72 flow [2021-06-13 08:22:23,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-13 08:22:23,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2021-06-13 08:22:23,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 37 transitions. [2021-06-13 08:22:23,037 INFO L545 CegarLoopForPetriNet]: DFA transition density 0.7708333333333334 [2021-06-13 08:22:23,037 INFO L72 ComplementDD]: Start complementDD. Operand 3 states and 37 transitions. [2021-06-13 08:22:23,037 INFO L73 IsDeterministic]: Start isDeterministic. Operand 3 states and 37 transitions. [2021-06-13 08:22:23,038 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-06-13 08:22:23,039 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 3 states and 37 transitions. [2021-06-13 08:22:23,040 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 4 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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) [2021-06-13 08:22:23,042 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:23,042 INFO L81 ComplementDD]: Finished complementDD. Result has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-13 08:22:23,043 INFO L185 Difference]: Start difference. First operand has 15 places, 13 transitions, 32 flow. Second operand 3 states and 37 transitions. [2021-06-13 08:22:23,044 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 17 places, 18 transitions, 72 flow [2021-06-13 08:22:23,045 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 15 places, 18 transitions, 64 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-06-13 08:22:23,046 INFO L241 Difference]: Finished difference. Result has 17 places, 15 transitions, 50 flow [2021-06-13 08:22:23,047 INFO L318 CegarLoopForPetriNet]: {PETRI_ALPHABET=16, PETRI_DIFFERENCE_MINUEND_FLOW=28, PETRI_DIFFERENCE_MINUEND_PLACES=13, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=13, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=1, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=10, PETRI_DIFFERENCE_SUBTRAHEND_STATES=3, PETRI_FLOW=50, PETRI_PLACES=17, PETRI_TRANSITIONS=15} [2021-06-13 08:22:23,048 INFO L335 CegarLoopForPetriNet]: 15 programPoint places, 2 predicate places. [2021-06-13 08:22:23,048 INFO L482 AbstractCegarLoop]: Abstraction has has 17 places, 15 transitions, 50 flow [2021-06-13 08:22:23,048 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 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) [2021-06-13 08:22:23,048 INFO L247 CegarLoopForPetriNet]: Found error trace [2021-06-13 08:22:23,048 INFO L255 CegarLoopForPetriNet]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-06-13 08:22:23,048 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-06-13 08:22:23,048 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-06-13 08:22:23,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-13 08:22:23,049 INFO L82 PathProgramCache]: Analyzing trace with hash -962533184, now seen corresponding path program 1 times [2021-06-13 08:22:23,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-13 08:22:23,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733102503] [2021-06-13 08:22:23,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-13 08:22:23,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-13 08:22:23,056 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-13 08:22:23,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-06-13 08:22:23,062 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-06-13 08:22:23,070 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-06-13 08:22:23,071 INFO L573 BasicCegarLoop]: Counterexample might be feasible [2021-06-13 08:22:23,071 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-06-13 08:22:23,074 INFO L247 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2021-06-13 08:22:23,081 INFO L202 PluginConnector]: Adding new model fork_unchanged_local_variables2.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.06 08:22:23 BasicIcfg [2021-06-13 08:22:23,081 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-06-13 08:22:23,082 INFO L168 Benchmark]: Toolchain (without parser) took 549.79 ms. Allocated memory is still 184.5 MB. Free memory was 163.1 MB in the beginning and 154.7 MB in the end (delta: 8.4 MB). Peak memory consumption was 9.3 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:23,082 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.09 ms. Allocated memory is still 184.5 MB. Free memory is still 164.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-06-13 08:22:23,083 INFO L168 Benchmark]: Boogie Procedure Inliner took 18.44 ms. Allocated memory is still 184.5 MB. Free memory was 163.0 MB in the beginning and 161.6 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-06-13 08:22:23,083 INFO L168 Benchmark]: Boogie Preprocessor took 11.27 ms. Allocated memory is still 184.5 MB. Free memory was 161.5 MB in the beginning and 160.6 MB in the end (delta: 885.2 kB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:23,084 INFO L168 Benchmark]: RCFGBuilder took 170.34 ms. Allocated memory is still 184.5 MB. Free memory was 160.6 MB in the beginning and 151.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-06-13 08:22:23,084 INFO L168 Benchmark]: TraceAbstraction took 345.49 ms. Allocated memory is still 184.5 MB. Free memory was 151.0 MB in the beginning and 154.7 MB in the end (delta: -3.6 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-06-13 08:22:23,086 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 0.09 ms. Allocated memory is still 184.5 MB. Free memory is still 164.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 18.44 ms. Allocated memory is still 184.5 MB. Free memory was 163.0 MB in the beginning and 161.6 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 8.0 GB. * Boogie Preprocessor took 11.27 ms. Allocated memory is still 184.5 MB. Free memory was 161.5 MB in the beginning and 160.6 MB in the end (delta: 885.2 kB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 170.34 ms. Allocated memory is still 184.5 MB. Free memory was 160.6 MB in the beginning and 151.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * TraceAbstraction took 345.49 ms. Allocated memory is still 184.5 MB. Free memory was 151.0 MB in the beginning and 154.7 MB in the end (delta: -3.6 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 25]: assertion can be violated assertion can be violated We found a FailurePath: [L17] 0 res := 0; VAL [res=0] [L18] 0 x := 0; VAL [res=0, x=0] [L20] COND TRUE 0 x < 3 VAL [res=0, x=0] [L21] FORK 0 fork x foo(); VAL [res=0, x=0] [L22] 0 resOld := res; VAL [res=0, resOld=0, x=0] [L35] 1 res := y; VAL [res=0, res=3, resOld=0, x=0, y=3] [L23] JOIN 1 join x assign res; VAL [res=3, res=3, resOld=0, x=0, y=3] [L24] COND FALSE 0 !(x > 0) VAL [res=3, res=3, resOld=0, x=0, y=3] [L27] 0 x := x + 1; VAL [res=3, res=3, resOld=0, x=1, y=3] [L20] COND TRUE 0 x < 3 VAL [res=3, res=3, resOld=0, x=1, y=3] [L21] FORK 0 fork x foo(); VAL [res=3, resOld=0, x=1] [L22] 0 resOld := res; VAL [res=3, resOld=3, x=1] [L35] 1 res := y; VAL [res=2, res=3, resOld=3, x=1, y=2] [L23] JOIN 1 join x assign res; VAL [res=2, res=2, resOld=3, x=1, y=2] [L24] COND TRUE 0 x > 0 VAL [res=2, res=2, resOld=3, x=1, y=2] [L25] 0 assert resOld == res; VAL [res=2, res=2, resOld=3, x=1, y=2] - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: ULTIMATE.start with 1 thread instances CFG has 3 procedures, 19 locations, 2 error locations. Started 1 CEGAR loops. EmptinessCheckTime: 2.9ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 270.8ms, OverallIterations: 2, TraceHistogramMax: 2, EmptinessCheckTime: 0.0ms, AutomataDifference: 98.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 20.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 2 SDtfs, 1 SDslu, 0 SDs, 0 SdLazy, 10 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 12.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.9ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=50occurred in iteration=1, InterpolantAutomatonStates: 3, 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: 4.5ms SsaConstructionTime, 15.5ms SatisfiabilityAnalysisTime, 54.4ms InterpolantComputationTime, 28 NumberOfCodeBlocks, 28 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 9 ConstructedInterpolants, 0 QuantifiedInterpolants, 23 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...