./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-fpi/nsqmf.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version eb692b52 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-fpi/nsqmf.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 39aacadb1ef8d9484ed01fea6a4b942ae6d8d46b70aa8d3c1aaf631adea16a64 --- Real Ultimate output --- This is Ultimate 0.2.2-?-eb692b5 [2022-07-19 10:36:06,200 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-19 10:36:06,202 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-19 10:36:06,243 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-19 10:36:06,243 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-19 10:36:06,245 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-19 10:36:06,247 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-19 10:36:06,252 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-19 10:36:06,253 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-19 10:36:06,258 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-19 10:36:06,259 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-19 10:36:06,260 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-19 10:36:06,261 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-19 10:36:06,261 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-19 10:36:06,262 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-19 10:36:06,263 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-19 10:36:06,264 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-19 10:36:06,264 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-19 10:36:06,265 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-19 10:36:06,267 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-19 10:36:06,268 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-19 10:36:06,270 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-19 10:36:06,272 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-19 10:36:06,273 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-19 10:36:06,274 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-19 10:36:06,276 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-19 10:36:06,279 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-19 10:36:06,279 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-19 10:36:06,280 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-19 10:36:06,281 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-19 10:36:06,282 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-19 10:36:06,282 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-19 10:36:06,283 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-19 10:36:06,284 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-19 10:36:06,285 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-19 10:36:06,285 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-19 10:36:06,285 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-19 10:36:06,286 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-19 10:36:06,286 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-19 10:36:06,286 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-19 10:36:06,287 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-19 10:36:06,288 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-19 10:36:06,289 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-19 10:36:06,319 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-19 10:36:06,319 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-19 10:36:06,320 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-19 10:36:06,320 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-19 10:36:06,320 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-19 10:36:06,321 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-19 10:36:06,321 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-19 10:36:06,321 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-19 10:36:06,322 INFO L138 SettingsManager]: * Use SBE=true [2022-07-19 10:36:06,322 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-19 10:36:06,323 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-19 10:36:06,323 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-19 10:36:06,323 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-19 10:36:06,323 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-19 10:36:06,323 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-19 10:36:06,324 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-19 10:36:06,324 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-19 10:36:06,324 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-19 10:36:06,324 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-19 10:36:06,324 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-19 10:36:06,324 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-19 10:36:06,325 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-19 10:36:06,325 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-19 10:36:06,325 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-19 10:36:06,325 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-19 10:36:06,325 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-19 10:36:06,326 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-19 10:36:06,326 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-19 10:36:06,326 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-19 10:36:06,326 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-19 10:36:06,326 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-19 10:36:06,327 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-19 10:36:06,327 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-19 10:36:06,327 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39aacadb1ef8d9484ed01fea6a4b942ae6d8d46b70aa8d3c1aaf631adea16a64 [2022-07-19 10:36:06,538 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-19 10:36:06,562 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-19 10:36:06,564 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-19 10:36:06,564 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-19 10:36:06,565 INFO L275 PluginConnector]: CDTParser initialized [2022-07-19 10:36:06,566 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/nsqmf.c [2022-07-19 10:36:06,622 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e5f6931d/b0d0e6a178094646a452f6873da1cf00/FLAGac37cbf7f [2022-07-19 10:36:07,003 INFO L306 CDTParser]: Found 1 translation units. [2022-07-19 10:36:07,004 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/nsqmf.c [2022-07-19 10:36:07,011 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e5f6931d/b0d0e6a178094646a452f6873da1cf00/FLAGac37cbf7f [2022-07-19 10:36:07,409 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e5f6931d/b0d0e6a178094646a452f6873da1cf00 [2022-07-19 10:36:07,412 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-19 10:36:07,414 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-19 10:36:07,419 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-19 10:36:07,419 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-19 10:36:07,422 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-19 10:36:07,423 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,424 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ae2feac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07, skipping insertion in model container [2022-07-19 10:36:07,424 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,429 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-19 10:36:07,453 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-19 10:36:07,581 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/nsqmf.c[588,601] [2022-07-19 10:36:07,598 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-19 10:36:07,604 INFO L203 MainTranslator]: Completed pre-run [2022-07-19 10:36:07,616 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/nsqmf.c[588,601] [2022-07-19 10:36:07,623 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-19 10:36:07,634 INFO L208 MainTranslator]: Completed translation [2022-07-19 10:36:07,635 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07 WrapperNode [2022-07-19 10:36:07,635 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-19 10:36:07,636 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-19 10:36:07,636 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-19 10:36:07,636 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-19 10:36:07,640 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,645 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,667 INFO L137 Inliner]: procedures = 16, calls = 19, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 72 [2022-07-19 10:36:07,667 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-19 10:36:07,668 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-19 10:36:07,668 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-19 10:36:07,668 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-19 10:36:07,673 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,673 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,675 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,675 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,680 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,683 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,684 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,686 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-19 10:36:07,687 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-19 10:36:07,687 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-19 10:36:07,687 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-19 10:36:07,688 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (1/1) ... [2022-07-19 10:36:07,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-19 10:36:07,700 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-19 10:36:07,709 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-19 10:36:07,720 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-19 10:36:07,748 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-19 10:36:07,748 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-19 10:36:07,748 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-07-19 10:36:07,748 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-07-19 10:36:07,748 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-19 10:36:07,749 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-19 10:36:07,749 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-07-19 10:36:07,801 INFO L234 CfgBuilder]: Building ICFG [2022-07-19 10:36:07,802 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-19 10:36:07,920 INFO L275 CfgBuilder]: Performing block encoding [2022-07-19 10:36:07,925 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-19 10:36:07,925 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-07-19 10:36:07,927 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 10:36:07 BoogieIcfgContainer [2022-07-19 10:36:07,927 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-19 10:36:07,929 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-19 10:36:07,929 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-19 10:36:07,932 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-19 10:36:07,932 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.07 10:36:07" (1/3) ... [2022-07-19 10:36:07,932 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ae1ca03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.07 10:36:07, skipping insertion in model container [2022-07-19 10:36:07,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 10:36:07" (2/3) ... [2022-07-19 10:36:07,933 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ae1ca03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.07 10:36:07, skipping insertion in model container [2022-07-19 10:36:07,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 10:36:07" (3/3) ... [2022-07-19 10:36:07,934 INFO L111 eAbstractionObserver]: Analyzing ICFG nsqmf.c [2022-07-19 10:36:07,946 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-19 10:36:07,946 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-19 10:36:07,993 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-19 10:36:07,999 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@4d188b00, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@2391ba20 [2022-07-19 10:36:07,999 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-19 10:36:08,002 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 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) [2022-07-19 10:36:08,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-19 10:36:08,008 INFO L187 NwaCegarLoop]: Found error trace [2022-07-19 10:36:08,008 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 10:36:08,009 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-19 10:36:08,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 10:36:08,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1828546148, now seen corresponding path program 1 times [2022-07-19 10:36:08,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 10:36:08,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179858181] [2022-07-19 10:36:08,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 10:36:08,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 10:36:08,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-19 10:36:08,160 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-19 10:36:08,160 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-19 10:36:08,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179858181] [2022-07-19 10:36:08,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179858181] provided 1 perfect and 0 imperfect interpolant sequences [2022-07-19 10:36:08,162 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-07-19 10:36:08,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-07-19 10:36:08,163 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578955109] [2022-07-19 10:36:08,164 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-07-19 10:36:08,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-07-19 10:36:08,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-19 10:36:08,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-07-19 10:36:08,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-19 10:36:08,200 INFO L87 Difference]: Start difference. First operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 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) Second operand has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 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) [2022-07-19 10:36:08,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-19 10:36:08,215 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2022-07-19 10:36:08,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-07-19 10:36:08,217 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 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) Word has length 12 [2022-07-19 10:36:08,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-19 10:36:08,224 INFO L225 Difference]: With dead ends: 38 [2022-07-19 10:36:08,224 INFO L226 Difference]: Without dead ends: 17 [2022-07-19 10:36:08,227 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-07-19 10:36:08,233 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-19 10:36:08,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-19 10:36:08,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-07-19 10:36:08,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-07-19 10:36:08,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 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) [2022-07-19 10:36:08,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-07-19 10:36:08,266 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2022-07-19 10:36:08,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-19 10:36:08,267 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-07-19 10:36:08,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 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) [2022-07-19 10:36:08,268 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-07-19 10:36:08,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-07-19 10:36:08,268 INFO L187 NwaCegarLoop]: Found error trace [2022-07-19 10:36:08,268 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-19 10:36:08,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-07-19 10:36:08,269 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-19 10:36:08,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-19 10:36:08,270 INFO L85 PathProgramCache]: Analyzing trace with hash -1148487778, now seen corresponding path program 1 times [2022-07-19 10:36:08,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-19 10:36:08,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124623205] [2022-07-19 10:36:08,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 10:36:08,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-19 10:36:08,313 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-07-19 10:36:08,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [166140982] [2022-07-19 10:36:08,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-19 10:36:08,314 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-19 10:36:08,315 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-19 10:36:08,316 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-19 10:36:08,318 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-19 10:36:08,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-19 10:36:08,414 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-19 10:36:08,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-19 10:36:08,455 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-19 10:36:08,460 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-19 10:36:08,461 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-07-19 10:36:08,491 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-07-19 10:36:08,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-19 10:36:08,689 INFO L356 BasicCegarLoop]: Path program histogram: [1, 1] [2022-07-19 10:36:08,692 INFO L176 ceAbstractionStarter]: Computing trace abstraction results [2022-07-19 10:36:08,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.07 10:36:08 BoogieIcfgContainer [2022-07-19 10:36:08,716 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-07-19 10:36:08,716 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-07-19 10:36:08,717 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-07-19 10:36:08,717 INFO L275 PluginConnector]: Witness Printer initialized [2022-07-19 10:36:08,717 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 10:36:07" (3/4) ... [2022-07-19 10:36:08,718 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-07-19 10:36:08,751 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2022-07-19 10:36:08,751 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-07-19 10:36:08,752 INFO L158 Benchmark]: Toolchain (without parser) took 1338.07ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 49.5MB in the beginning and 59.5MB in the end (delta: -9.9MB). Peak memory consumption was 8.1MB. Max. memory is 16.1GB. [2022-07-19 10:36:08,757 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 88.1MB. Free memory is still 65.6MB. There was no memory consumed. Max. memory is 16.1GB. [2022-07-19 10:36:08,758 INFO L158 Benchmark]: CACSL2BoogieTranslator took 215.87ms. Allocated memory is still 88.1MB. Free memory was 49.3MB in the beginning and 63.4MB in the end (delta: -14.0MB). Peak memory consumption was 6.0MB. Max. memory is 16.1GB. [2022-07-19 10:36:08,758 INFO L158 Benchmark]: Boogie Procedure Inliner took 31.86ms. Allocated memory is still 88.1MB. Free memory was 63.4MB in the beginning and 61.7MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-19 10:36:08,759 INFO L158 Benchmark]: Boogie Preprocessor took 18.03ms. Allocated memory is still 88.1MB. Free memory was 61.7MB in the beginning and 60.6MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-19 10:36:08,763 INFO L158 Benchmark]: RCFGBuilder took 240.67ms. Allocated memory is still 88.1MB. Free memory was 60.5MB in the beginning and 50.0MB in the end (delta: 10.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-07-19 10:36:08,764 INFO L158 Benchmark]: TraceAbstraction took 787.31ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 49.5MB in the beginning and 61.3MB in the end (delta: -11.8MB). Peak memory consumption was 8.1MB. Max. memory is 16.1GB. [2022-07-19 10:36:08,765 INFO L158 Benchmark]: Witness Printer took 34.82ms. Allocated memory is still 107.0MB. Free memory was 61.3MB in the beginning and 59.5MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-19 10:36:08,768 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 88.1MB. Free memory is still 65.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 215.87ms. Allocated memory is still 88.1MB. Free memory was 49.3MB in the beginning and 63.4MB in the end (delta: -14.0MB). Peak memory consumption was 6.0MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 31.86ms. Allocated memory is still 88.1MB. Free memory was 63.4MB in the beginning and 61.7MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 18.03ms. Allocated memory is still 88.1MB. Free memory was 61.7MB in the beginning and 60.6MB in the end (delta: 1.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 240.67ms. Allocated memory is still 88.1MB. Free memory was 60.5MB in the beginning and 50.0MB in the end (delta: 10.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 787.31ms. Allocated memory was 88.1MB in the beginning and 107.0MB in the end (delta: 18.9MB). Free memory was 49.5MB in the beginning and 61.3MB in the end (delta: -11.8MB). Peak memory consumption was 8.1MB. Max. memory is 16.1GB. * Witness Printer took 34.82ms. Allocated memory is still 107.0MB. Free memory was 61.3MB in the beginning and 59.5MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L19] int N; VAL [N=0] [L23] N = __VERIFIER_nondet_int() [L24] COND FALSE !(N <= 0) [L25] CALL assume_abort_if_not(N <= 2147483647/sizeof(int)) [L13] COND FALSE !(!cond) VAL [\old(cond)=1, cond=1, N=1] [L25] RET assume_abort_if_not(N <= 2147483647/sizeof(int)) [L27] int i; [L28] long long *a = malloc(sizeof(long long)*N); [L29] long long *b = malloc(sizeof(long long)*N); [L31] b[0] = 1 [L32] a[0] = 1 [L34] i=1 VAL [a={-2:0}, b={-1:0}, i=1, N=1] [L34] COND FALSE !(i