/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-PN-VariableLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-d5b4239aa45c8d22a30959944f2ef622f7386a6d-d5b4239 [2021-03-24 13:30:12,844 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-03-24 13:30:12,846 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-03-24 13:30:12,870 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-03-24 13:30:12,871 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-03-24 13:30:12,872 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-03-24 13:30:12,873 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-03-24 13:30:12,875 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-03-24 13:30:12,876 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-03-24 13:30:12,877 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-03-24 13:30:12,893 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-03-24 13:30:12,894 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-03-24 13:30:12,895 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-03-24 13:30:12,896 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-03-24 13:30:12,897 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-03-24 13:30:12,897 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-03-24 13:30:12,898 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-03-24 13:30:12,899 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-03-24 13:30:12,900 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-03-24 13:30:12,902 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-03-24 13:30:12,903 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-03-24 13:30:12,904 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-03-24 13:30:12,906 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-03-24 13:30:12,906 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-03-24 13:30:12,909 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-03-24 13:30:12,911 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-03-24 13:30:12,912 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-03-24 13:30:12,913 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-03-24 13:30:12,913 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-03-24 13:30:12,914 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-03-24 13:30:12,915 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-03-24 13:30:12,915 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-03-24 13:30:12,915 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-03-24 13:30:12,916 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-03-24 13:30:12,917 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-03-24 13:30:12,917 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-03-24 13:30:12,918 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-VariableLbe.epf [2021-03-24 13:30:12,961 INFO L113 SettingsManager]: Loading preferences was successful [2021-03-24 13:30:12,962 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-03-24 13:30:12,965 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-03-24 13:30:12,965 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-03-24 13:30:12,966 INFO L138 SettingsManager]: * Use SBE=true [2021-03-24 13:30:12,966 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-03-24 13:30:12,966 INFO L138 SettingsManager]: * sizeof long=4 [2021-03-24 13:30:12,966 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-03-24 13:30:12,966 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-03-24 13:30:12,966 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-03-24 13:30:12,967 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-03-24 13:30:12,967 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-03-24 13:30:12,967 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-03-24 13:30:12,967 INFO L138 SettingsManager]: * sizeof long double=12 [2021-03-24 13:30:12,968 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-03-24 13:30:12,968 INFO L138 SettingsManager]: * Use constant arrays=true [2021-03-24 13:30:12,968 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-03-24 13:30:12,968 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-03-24 13:30:12,968 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-03-24 13:30:12,968 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-03-24 13:30:12,969 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-03-24 13:30:12,969 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 13:30:12,969 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-03-24 13:30:12,969 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-03-24 13:30:12,969 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-03-24 13:30:12,969 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-03-24 13:30:12,969 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-03-24 13:30:12,970 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=VARIABLE_BASED_MOVER_CHECK [2021-03-24 13:30:12,970 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-03-24 13:30:12,970 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-03-24 13:30:13,251 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-03-24 13:30:13,279 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-03-24 13:30:13,282 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-03-24 13:30:13,283 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-03-24 13:30:13,284 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-03-24 13:30:13,284 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl [2021-03-24 13:30:13,285 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/fork_in_loop.bpl' [2021-03-24 13:30:13,323 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-03-24 13:30:13,325 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-03-24 13:30:13,326 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-03-24 13:30:13,326 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-03-24 13:30:13,326 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-03-24 13:30:13,337 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 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,342 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 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,348 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-03-24 13:30:13,349 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-03-24 13:30:13,349 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-03-24 13:30:13,349 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-03-24 13:30:13,358 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,359 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,359 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,359 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,361 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,364 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,364 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/1) ... [2021-03-24 13:30:13,365 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-03-24 13:30:13,366 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-03-24 13:30:13,366 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-03-24 13:30:13,366 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-03-24 13:30:13,367 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-03-24 13:30:13,423 INFO L124 BoogieDeclarations]: Specification and implementation of procedure foo given in one single declaration [2021-03-24 13:30:13,424 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2021-03-24 13:30:13,424 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2021-03-24 13:30:13,424 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-03-24 13:30:13,424 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-03-24 13:30:13,425 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-03-24 13:30:13,587 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-03-24 13:30:13,587 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-03-24 13:30:13,590 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:30:13 BoogieIcfgContainer [2021-03-24 13:30:13,590 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-03-24 13:30:13,593 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-03-24 13:30:13,593 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-03-24 13:30:13,595 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-03-24 13:30:13,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 24.03 01:30:13" (1/2) ... [2021-03-24 13:30:13,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74c081df and model type fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.03 01:30:13, skipping insertion in model container [2021-03-24 13:30:13,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.03 01:30:13" (2/2) ... [2021-03-24 13:30:13,603 INFO L111 eAbstractionObserver]: Analyzing ICFG fork_in_loop.bpl [2021-03-24 13:30:13,612 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-03-24 13:30:13,616 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-03-24 13:30:13,617 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-03-24 13:30:13,646 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:13,647 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:13,648 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:13,648 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:13,652 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:13,663 WARN L313 ript$VariableManager]: TermVariabe fooThread1of1ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:13,673 INFO L149 ThreadInstanceAdder]: Constructed 6 joinOtherThreadTransitions. [2021-03-24 13:30:13,688 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-24 13:30:13,706 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:30:13,706 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:30:13,706 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:30:13,706 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:30:13,706 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:30:13,706 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:30:13,706 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:30:13,706 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:30:13,714 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 27 places, 25 transitions, 78 flow [2021-03-24 13:30:13,730 INFO L129 PetriNetUnfolder]: 0/23 cut-off events. [2021-03-24 13:30:13,731 INFO L130 PetriNetUnfolder]: For 2/2 co-relation queries the response was YES. [2021-03-24 13:30:13,732 INFO L84 FinitePrefix]: Finished finitePrefix Result has 34 conditions, 23 events. 0/23 cut-off events. For 2/2 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 22 event pairs, 0 based on Foata normal form. 0/19 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:30:13,732 INFO L82 GeneralOperation]: Start removeDead. Operand has 27 places, 25 transitions, 78 flow [2021-03-24 13:30:13,735 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 21 places, 16 transitions, 45 flow [2021-03-24 13:30:13,736 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:30:13,743 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 21 places, 16 transitions, 45 flow [2021-03-24 13:30:13,746 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 21 places, 16 transitions, 45 flow [2021-03-24 13:30:13,746 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 21 places, 16 transitions, 45 flow [2021-03-24 13:30:13,751 INFO L129 PetriNetUnfolder]: 0/20 cut-off events. [2021-03-24 13:30:13,751 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:30:13,752 INFO L84 FinitePrefix]: Finished finitePrefix Result has 30 conditions, 20 events. 0/20 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 17 event pairs, 0 based on Foata normal form. 0/18 useless extension candidates. Maximal degree in co-relation 0. Up to 2 conditions per place. [2021-03-24 13:30:13,753 INFO L142 LiptonReduction]: Number of co-enabled transitions 32 [2021-03-24 13:30:13,883 INFO L154 LiptonReduction]: Checked pairs total: 12 [2021-03-24 13:30:13,883 INFO L156 LiptonReduction]: Total number of compositions: 4 [2021-03-24 13:30:13,885 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 150 [2021-03-24 13:30:13,900 INFO L129 PetriNetUnfolder]: 0/8 cut-off events. [2021-03-24 13:30:13,900 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:30:13,900 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:13,901 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 1, 1, 1, 1] [2021-03-24 13:30:13,902 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:13,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:13,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1921556130, now seen corresponding path program 1 times [2021-03-24 13:30:13,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:13,915 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410611561] [2021-03-24 13:30:13,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:13,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:14,020 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,022 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:14,029 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,030 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:14,045 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,046 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:14,047 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-03-24 13:30:14,048 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410611561] [2021-03-24 13:30:14,049 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:14,049 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:30:14,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392411548] [2021-03-24 13:30:14,056 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:30:14,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:14,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:30:14,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:30:14,073 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 14 out of 29 [2021-03-24 13:30:14,074 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 18 places, 13 transitions, 39 flow. Second operand has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,075 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:14,075 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 14 of 29 [2021-03-24 13:30:14,076 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:14,138 INFO L129 PetriNetUnfolder]: 0/13 cut-off events. [2021-03-24 13:30:14,139 INFO L130 PetriNetUnfolder]: For 1/1 co-relation queries the response was YES. [2021-03-24 13:30:14,139 INFO L84 FinitePrefix]: Finished finitePrefix Result has 33 conditions, 13 events. 0/13 cut-off events. For 1/1 co-relation queries the response was YES. Maximal size of possible extension queue 2. Compared 6 event pairs, 0 based on Foata normal form. 0/12 useless extension candidates. Maximal degree in co-relation 0. Up to 8 conditions per place. [2021-03-24 13:30:14,141 INFO L132 encePairwiseOnDemand]: 24/29 looper letters, 5 selfloop transitions, 4 changer transitions 1/13 dead transitions. [2021-03-24 13:30:14,141 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 20 places, 13 transitions, 57 flow [2021-03-24 13:30:14,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:30:14,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:30:14,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 67 transitions. [2021-03-24 13:30:14,151 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.5775862068965517 [2021-03-24 13:30:14,152 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 67 transitions. [2021-03-24 13:30:14,152 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 67 transitions. [2021-03-24 13:30:14,153 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:14,155 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 67 transitions. [2021-03-24 13:30:14,156 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 16.75) internal successors, (67), 4 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,162 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 29.0) internal successors, (145), 5 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,162 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 29.0) internal successors, (145), 5 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,164 INFO L185 Difference]: Start difference. First operand has 18 places, 13 transitions, 39 flow. Second operand 4 states and 67 transitions. [2021-03-24 13:30:14,164 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 20 places, 13 transitions, 57 flow [2021-03-24 13:30:14,167 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 18 places, 13 transitions, 53 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-24 13:30:14,175 INFO L241 Difference]: Finished difference. Result has 19 places, 12 transitions, 44 flow [2021-03-24 13:30:14,177 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=29, PETRI_DIFFERENCE_MINUEND_FLOW=31, PETRI_DIFFERENCE_MINUEND_PLACES=15, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=12, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=4, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=8, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=44, PETRI_PLACES=19, PETRI_TRANSITIONS=12} [2021-03-24 13:30:14,178 INFO L343 CegarLoopForPetriNet]: 18 programPoint places, 1 predicate places. [2021-03-24 13:30:14,178 INFO L480 AbstractCegarLoop]: Abstraction has has 19 places, 12 transitions, 44 flow [2021-03-24 13:30:14,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,178 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:14,179 INFO L263 CegarLoopForPetriNet]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:14,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-03-24 13:30:14,179 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:14,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:14,180 INFO L82 PathProgramCache]: Analyzing trace with hash -753814005, now seen corresponding path program 1 times [2021-03-24 13:30:14,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:14,180 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683457940] [2021-03-24 13:30:14,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:14,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:30:14,201 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:30:14,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:30:14,223 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:30:14,234 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:30:14,234 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:30:14,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-03-24 13:30:14,236 WARN L342 ceAbstractionStarter]: 1 thread instances were not sufficient, I will increase this number and restart the analysis [2021-03-24 13:30:14,236 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 2 thread instances. [2021-03-24 13:30:14,241 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,242 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,242 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,242 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,242 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,243 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,243 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,243 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,244 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,245 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork0_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,246 WARN L313 ript$VariableManager]: TermVariabe fooThread1of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,247 WARN L313 ript$VariableManager]: TermVariabe fooThread2of2ForFork1_y not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-03-24 13:30:14,256 INFO L149 ThreadInstanceAdder]: Constructed 12 joinOtherThreadTransitions. [2021-03-24 13:30:14,256 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-03-24 13:30:14,257 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-03-24 13:30:14,258 INFO L377 AbstractCegarLoop]: Hoare is false [2021-03-24 13:30:14,258 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-03-24 13:30:14,258 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-03-24 13:30:14,258 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-03-24 13:30:14,258 INFO L381 AbstractCegarLoop]: Difference is false [2021-03-24 13:30:14,258 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-03-24 13:30:14,258 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-03-24 13:30:14,259 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 37 places, 37 transitions, 134 flow [2021-03-24 13:30:14,277 INFO L129 PetriNetUnfolder]: 14/111 cut-off events. [2021-03-24 13:30:14,277 INFO L130 PetriNetUnfolder]: For 40/40 co-relation queries the response was YES. [2021-03-24 13:30:14,279 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 402 event pairs, 0 based on Foata normal form. 0/94 useless extension candidates. Maximal degree in co-relation 80. Up to 15 conditions per place. [2021-03-24 13:30:14,279 INFO L82 GeneralOperation]: Start removeDead. Operand has 37 places, 37 transitions, 134 flow [2021-03-24 13:30:14,280 INFO L88 GeneralOperation]: Finished RemoveDead, result has has 35 places, 33 transitions, 120 flow [2021-03-24 13:30:14,280 INFO L174 etLargeBlockEncoding]: Petri net LBE is using variable-based independence relation. [2021-03-24 13:30:14,280 INFO L137 etLargeBlockEncoding]: Starting large block encoding on Petri net that has 35 places, 33 transitions, 120 flow [2021-03-24 13:30:14,281 INFO L129 LiptonReduction]: Starting Lipton reduction on Petri net that has 35 places, 33 transitions, 120 flow [2021-03-24 13:30:14,281 INFO L74 FinitePrefix]: Start finitePrefix. Operand has 35 places, 33 transitions, 120 flow [2021-03-24 13:30:14,294 INFO L129 PetriNetUnfolder]: 14/101 cut-off events. [2021-03-24 13:30:14,295 INFO L130 PetriNetUnfolder]: For 40/40 co-relation queries the response was YES. [2021-03-24 13:30:14,295 INFO L84 FinitePrefix]: Finished finitePrefix Result has 166 conditions, 101 events. 14/101 cut-off events. For 40/40 co-relation queries the response was YES. Maximal size of possible extension queue 11. Compared 357 event pairs, 0 based on Foata normal form. 0/89 useless extension candidates. Maximal degree in co-relation 83. Up to 15 conditions per place. [2021-03-24 13:30:14,297 INFO L142 LiptonReduction]: Number of co-enabled transitions 280 [2021-03-24 13:30:14,398 INFO L154 LiptonReduction]: Checked pairs total: 86 [2021-03-24 13:30:14,398 INFO L156 LiptonReduction]: Total number of compositions: 5 [2021-03-24 13:30:14,398 INFO L199 CegarLoopForPetriNet]: Time needed for LBE in milliseconds: 118 [2021-03-24 13:30:14,402 INFO L129 PetriNetUnfolder]: 0/17 cut-off events. [2021-03-24 13:30:14,402 INFO L130 PetriNetUnfolder]: For 5/5 co-relation queries the response was YES. [2021-03-24 13:30:14,402 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:14,402 INFO L263 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1] [2021-03-24 13:30:14,402 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:14,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:14,403 INFO L82 PathProgramCache]: Analyzing trace with hash -1774446021, now seen corresponding path program 1 times [2021-03-24 13:30:14,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:14,403 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410615740] [2021-03-24 13:30:14,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:14,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:14,432 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,432 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:14,435 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,436 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:14,450 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,451 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:14,451 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-24 13:30:14,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410615740] [2021-03-24 13:30:14,452 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:14,452 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-03-24 13:30:14,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567446105] [2021-03-24 13:30:14,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-03-24 13:30:14,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:14,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-03-24 13:30:14,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-03-24 13:30:14,454 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 42 [2021-03-24 13:30:14,454 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 30 places, 28 transitions, 110 flow. Second operand has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,454 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:14,454 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 42 [2021-03-24 13:30:14,454 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:14,481 INFO L129 PetriNetUnfolder]: 1/27 cut-off events. [2021-03-24 13:30:14,481 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-03-24 13:30:14,481 INFO L84 FinitePrefix]: Finished finitePrefix Result has 65 conditions, 27 events. 1/27 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 23 event pairs, 0 based on Foata normal form. 0/23 useless extension candidates. Maximal degree in co-relation 59. Up to 9 conditions per place. [2021-03-24 13:30:14,482 INFO L132 encePairwiseOnDemand]: 36/42 looper letters, 9 selfloop transitions, 4 changer transitions 2/24 dead transitions. [2021-03-24 13:30:14,482 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 29 places, 24 transitions, 108 flow [2021-03-24 13:30:14,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-03-24 13:30:14,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4 states. [2021-03-24 13:30:14,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4 states to 4 states and 112 transitions. [2021-03-24 13:30:14,483 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6666666666666666 [2021-03-24 13:30:14,484 INFO L72 ComplementDD]: Start complementDD. Operand 4 states and 112 transitions. [2021-03-24 13:30:14,484 INFO L73 IsDeterministic]: Start isDeterministic. Operand 4 states and 112 transitions. [2021-03-24 13:30:14,484 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:14,484 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 4 states and 112 transitions. [2021-03-24 13:30:14,485 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 5 states, 4 states have (on average 28.0) internal successors, (112), 4 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,486 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 5 states, 5 states have (on average 42.0) internal successors, (210), 5 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,486 INFO L81 ComplementDD]: Finished complementDD. Result has 5 states, 5 states have (on average 42.0) internal successors, (210), 5 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,486 INFO L185 Difference]: Start difference. First operand has 30 places, 28 transitions, 110 flow. Second operand 4 states and 112 transitions. [2021-03-24 13:30:14,486 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 29 places, 24 transitions, 108 flow [2021-03-24 13:30:14,487 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 27 places, 24 transitions, 104 flow, removed 0 selfloop flow, removed 2 redundant places. [2021-03-24 13:30:14,488 INFO L241 Difference]: Finished difference. Result has 29 places, 21 transitions, 89 flow [2021-03-24 13:30:14,488 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=42, PETRI_DIFFERENCE_MINUEND_FLOW=66, PETRI_DIFFERENCE_MINUEND_PLACES=24, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=3, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=16, PETRI_DIFFERENCE_SUBTRAHEND_STATES=4, PETRI_FLOW=89, PETRI_PLACES=29, PETRI_TRANSITIONS=21} [2021-03-24 13:30:14,488 INFO L343 CegarLoopForPetriNet]: 30 programPoint places, -1 predicate places. [2021-03-24 13:30:14,489 INFO L480 AbstractCegarLoop]: Abstraction has has 29 places, 21 transitions, 89 flow [2021-03-24 13:30:14,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 26.0) internal successors, (104), 4 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,489 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:14,489 INFO L263 CegarLoopForPetriNet]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:14,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-03-24 13:30:14,489 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:14,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:14,490 INFO L82 PathProgramCache]: Analyzing trace with hash -721300470, now seen corresponding path program 1 times [2021-03-24 13:30:14,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:14,490 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014566550] [2021-03-24 13:30:14,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:14,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-03-24 13:30:14,509 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,509 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:14,510 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,510 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:14,513 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,513 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:14,517 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,517 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-03-24 13:30:14,522 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-03-24 13:30:14,522 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-03-24 13:30:14,522 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-03-24 13:30:14,523 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014566550] [2021-03-24 13:30:14,523 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-03-24 13:30:14,523 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-03-24 13:30:14,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475131811] [2021-03-24 13:30:14,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-03-24 13:30:14,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-03-24 13:30:14,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-03-24 13:30:14,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-03-24 13:30:14,525 INFO L508 CegarLoopForPetriNet]: Number of universal loopers: 24 out of 42 [2021-03-24 13:30:14,525 INFO L92 encePairwiseOnDemand]: Start differencePairwiseOnDemand. First operand has 29 places, 21 transitions, 89 flow. Second operand has 5 states, 5 states have (on average 26.6) internal successors, (133), 5 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,525 INFO L101 encePairwiseOnDemand]: Universal subtrahend loopers provided by user. [2021-03-24 13:30:14,525 INFO L102 encePairwiseOnDemand]: Number of universal subtrahend loopers: 24 of 42 [2021-03-24 13:30:14,526 INFO L74 FinitePrefix]: Start finitePrefix. Operand will be constructed on-demand [2021-03-24 13:30:14,551 INFO L129 PetriNetUnfolder]: 1/23 cut-off events. [2021-03-24 13:30:14,552 INFO L130 PetriNetUnfolder]: For 8/8 co-relation queries the response was YES. [2021-03-24 13:30:14,552 INFO L84 FinitePrefix]: Finished finitePrefix Result has 67 conditions, 23 events. 1/23 cut-off events. For 8/8 co-relation queries the response was YES. Maximal size of possible extension queue 3. Compared 14 event pairs, 0 based on Foata normal form. 1/24 useless extension candidates. Maximal degree in co-relation 59. Up to 7 conditions per place. [2021-03-24 13:30:14,552 INFO L132 encePairwiseOnDemand]: 36/42 looper letters, 8 selfloop transitions, 5 changer transitions 1/22 dead transitions. [2021-03-24 13:30:14,552 INFO L138 encePairwiseOnDemand]: Finished differencePairwiseOnDemand. Result has 32 places, 22 transitions, 117 flow [2021-03-24 13:30:14,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-03-24 13:30:14,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2021-03-24 13:30:14,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 135 transitions. [2021-03-24 13:30:14,554 INFO L553 CegarLoopForPetriNet]: DFA transition density 0.6428571428571429 [2021-03-24 13:30:14,554 INFO L72 ComplementDD]: Start complementDD. Operand 5 states and 135 transitions. [2021-03-24 13:30:14,554 INFO L73 IsDeterministic]: Start isDeterministic. Operand 5 states and 135 transitions. [2021-03-24 13:30:14,555 INFO L80 IsDeterministic]: Finished isDeterministic. Operand is deterministic. [2021-03-24 13:30:14,555 INFO L117 ReachableStatesCopy]: Start reachableStatesCopy. Operand 5 states and 135 transitions. [2021-03-24 13:30:14,556 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends has 6 states, 5 states have (on average 27.0) internal successors, (135), 5 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,557 INFO L131 ReachableStatesCopy]: Finished reachableStatesCopy Result has 6 states, 6 states have (on average 42.0) internal successors, (252), 6 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,557 INFO L81 ComplementDD]: Finished complementDD. Result has 6 states, 6 states have (on average 42.0) internal successors, (252), 6 states have internal predecessors, (252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,558 INFO L185 Difference]: Start difference. First operand has 29 places, 21 transitions, 89 flow. Second operand 5 states and 135 transitions. [2021-03-24 13:30:14,558 INFO L82 GeneralOperation]: Start removeRedundantFlow. Operand has 32 places, 22 transitions, 117 flow [2021-03-24 13:30:14,559 INFO L88 GeneralOperation]: Finished removeRedundantFlow, result has has 29 places, 22 transitions, 110 flow, removed 0 selfloop flow, removed 3 redundant places. [2021-03-24 13:30:14,560 INFO L241 Difference]: Finished difference. Result has 31 places, 20 transitions, 95 flow [2021-03-24 13:30:14,560 INFO L326 CegarLoopForPetriNet]: {PETRI_ALPHABET=42, PETRI_DIFFERENCE_MINUEND_FLOW=76, PETRI_DIFFERENCE_MINUEND_PLACES=25, PETRI_DIFFERENCE_MINUEND_TRANSITIONS=20, PETRI_DIFFERENCE_SUBTRAHEND_LETTERS_WITH_MORE_CHANGERS_THAN_LOOPERS=5, PETRI_DIFFERENCE_SUBTRAHEND_LOOPER_ONLY_LETTERS=15, PETRI_DIFFERENCE_SUBTRAHEND_STATES=5, PETRI_FLOW=95, PETRI_PLACES=31, PETRI_TRANSITIONS=20} [2021-03-24 13:30:14,560 INFO L343 CegarLoopForPetriNet]: 30 programPoint places, 1 predicate places. [2021-03-24 13:30:14,561 INFO L480 AbstractCegarLoop]: Abstraction has has 31 places, 20 transitions, 95 flow [2021-03-24 13:30:14,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 26.6) internal successors, (133), 5 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-03-24 13:30:14,561 INFO L255 CegarLoopForPetriNet]: Found error trace [2021-03-24 13:30:14,561 INFO L263 CegarLoopForPetriNet]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-03-24 13:30:14,561 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-03-24 13:30:14,561 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-03-24 13:30:14,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-03-24 13:30:14,562 INFO L82 PathProgramCache]: Analyzing trace with hash 931910734, now seen corresponding path program 1 times [2021-03-24 13:30:14,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-03-24 13:30:14,562 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894542424] [2021-03-24 13:30:14,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-03-24 13:30:14,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:30:14,570 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:30:14,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-03-24 13:30:14,578 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-03-24 13:30:14,581 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-03-24 13:30:14,581 INFO L634 BasicCegarLoop]: Counterexample might be feasible [2021-03-24 13:30:14,581 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-03-24 13:30:14,595 INFO L202 PluginConnector]: Adding new model fork_in_loop.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.03 01:30:14 BasicIcfg [2021-03-24 13:30:14,596 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-03-24 13:30:14,597 INFO L168 Benchmark]: Toolchain (without parser) took 1271.87 ms. Allocated memory was 255.9 MB in the beginning and 341.8 MB in the end (delta: 86.0 MB). Free memory was 236.6 MB in the beginning and 298.6 MB in the end (delta: -62.1 MB). Peak memory consumption was 25.5 MB. Max. memory is 16.0 GB. [2021-03-24 13:30:14,598 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.13 ms. Allocated memory is still 255.9 MB. Free memory was 237.7 MB in the beginning and 237.5 MB in the end (delta: 168.8 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 13:30:14,598 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.49 ms. Allocated memory is still 255.9 MB. Free memory was 236.4 MB in the beginning and 235.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-03-24 13:30:14,599 INFO L168 Benchmark]: Boogie Preprocessor took 16.14 ms. Allocated memory is still 255.9 MB. Free memory was 235.0 MB in the beginning and 234.1 MB in the end (delta: 876.8 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-03-24 13:30:14,599 INFO L168 Benchmark]: RCFGBuilder took 223.91 ms. Allocated memory is still 255.9 MB. Free memory was 234.1 MB in the beginning and 238.7 MB in the end (delta: -4.6 MB). Peak memory consumption was 18.5 MB. Max. memory is 16.0 GB. [2021-03-24 13:30:14,600 INFO L168 Benchmark]: TraceAbstraction took 1002.90 ms. Allocated memory was 255.9 MB in the beginning and 341.8 MB in the end (delta: 86.0 MB). Free memory was 238.1 MB in the beginning and 298.6 MB in the end (delta: -60.6 MB). Peak memory consumption was 25.8 MB. Max. memory is 16.0 GB. [2021-03-24 13:30:14,603 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 0.13 ms. Allocated memory is still 255.9 MB. Free memory was 237.7 MB in the beginning and 237.5 MB in the end (delta: 168.8 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 22.49 ms. Allocated memory is still 255.9 MB. Free memory was 236.4 MB in the beginning and 235.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 16.14 ms. Allocated memory is still 255.9 MB. Free memory was 235.0 MB in the beginning and 234.1 MB in the end (delta: 876.8 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 223.91 ms. Allocated memory is still 255.9 MB. Free memory was 234.1 MB in the beginning and 238.7 MB in the end (delta: -4.6 MB). Peak memory consumption was 18.5 MB. Max. memory is 16.0 GB. * TraceAbstraction took 1002.90 ms. Allocated memory was 255.9 MB in the beginning and 341.8 MB in the end (delta: 86.0 MB). Free memory was 238.1 MB in the beginning and 298.6 MB in the end (delta: -60.6 MB). Peak memory consumption was 25.8 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 137.9ms, 21 PlacesBefore, 18 PlacesAfterwards, 16 TransitionsBefore, 13 TransitionsAfterwards, 32 CoEnabledTransitionPairs, 2 FixpointIterations, 0 TrivialSequentialCompositions, 3 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 1 ConcurrentYvCompositions, 0 ChoiceCompositions, 4 TotalNumberOfCompositions, 12 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 12, positive: 12, positive conditional: 0, positive unconditional: 12, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 10, positive: 10, positive conditional: 0, positive unconditional: 10, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 10, positive: 10, positive conditional: 0, positive unconditional: 10, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 12, positive: 2, positive conditional: 0, positive unconditional: 2, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 10, unknown conditional: 0, unknown unconditional: 10] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - StatisticsResult: PetriNetLargeBlockEncoding benchmarks Lipton Reduction Statistics: ReductionTime: 117.7ms, 35 PlacesBefore, 30 PlacesAfterwards, 33 TransitionsBefore, 28 TransitionsAfterwards, 280 CoEnabledTransitionPairs, 2 FixpointIterations, 0 TrivialSequentialCompositions, 5 ConcurrentSequentialCompositions, 0 TrivialYvCompositions, 0 ConcurrentYvCompositions, 0 ChoiceCompositions, 5 TotalNumberOfCompositions, 86 MoverChecksTotal, Independence Relation Statistics: CachedIndependenceRelation.Independence Queries: [ total: 86, positive: 86, positive conditional: 0, positive unconditional: 86, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , CachedIndependenceRelation.Statistics on underlying relation: ConditionTransformingIndependenceRelation.Independence Queries: [ total: 78, positive: 78, positive conditional: 0, positive unconditional: 78, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , ConditionTransformingIndependenceRelation.Statistics on underlying relation: SyntacticIndependenceRelation.Independence Queries: [ total: 78, positive: 78, positive conditional: 0, positive unconditional: 78, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 0, unknown conditional: 0, unknown unconditional: 0] , Cache Queries: [ total: 86, positive: 8, positive conditional: 0, positive unconditional: 8, negative: 0, negative conditional: 0, negative unconditional: 0, unknown: 78, unknown conditional: 0, unknown unconditional: 78] , Statistics on independence cache: Total cache size (in pairs): 0, Positive cache size: 0, Positive conditional cache size: 0, Positive unconditional cache size: 0, Negative cache size: 0, Negative conditional cache size: 0, Negative unconditional cache size: 0 - CounterExampleResult [Line: 35]: assertion can be violated assertion can be violated We found a FailurePath: [L20] 0 x := 1; VAL [x=1] [L22] COND TRUE 0 x < 2 VAL [x=1] [L23] FORK 0 fork x foo(x); VAL [i=1, x=1] [L42] 1 y := 4; [L24] 0 x := x + 1; VAL [i=1, x=2, y=4] [L22] COND FALSE 0 !(x < 2) [L26] 0 x := 1; VAL [i=1, x=1, y=4] [L27] JOIN 1 join x; VAL [i=1, x=1, y=4] [L28] COND TRUE 0 x < 3 VAL [i=1, x=1, y=4] [L29] FORK 0 fork x foo(x); VAL [i=1, x=1, y=4] [L30] 0 x := x + 1; VAL [i=1, x=2, y=4] [L28] COND TRUE 0 x < 3 VAL [i=1, x=2, y=4] [L29] FORK 0 fork x foo(x); VAL [i=2, x=2, y=4] [L42] 3 y := 4; [L42] 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] [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 CFG has 2 procedures, 18 locations, 1 error locations. Started 2 CEGAR loops. EmptinessCheckTime: 8.3ms, RemoveRedundantFlowTime: 0.0ms, RemoveRedundantFlowUnfoldingTime: 0.0ms, BackfoldingTime: 0.0ms, BackfoldingUnfoldingTime: 0.0ms, FlowIncreaseByBackfolding: 0, BasicCegarLoop: VerificationResult: UNSAFE, OverallTime: 857.8ms, OverallIterations: 5, TraceHistogramMax: 3, EmptinessCheckTime: 0.0ms, AutomataDifference: 183.7ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 328.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 3 SDtfs, 15 SDslu, 0 SDs, 0 SdLazy, 63 SolverSat, 14 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 55.2ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 45.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=110occurred in iteration=0, InterpolantAutomatonStates: 13, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 8.7ms SsaConstructionTime, 42.0ms SatisfiabilityAnalysisTime, 129.7ms InterpolantComputationTime, 60 NumberOfCodeBlocks, 60 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 27 ConstructedInterpolants, 0 QuantifiedInterpolants, 61 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 17/17 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...