java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AbstractInterpretationC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Camel+AI_EQ_imprecise.epf -i ../../../trunk/examples/svcomp/array-memsafety/reverse_array_alloca_unsafe_false-valid-deref.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-a5595af [2018-01-31 22:17:22,972 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-31 22:17:22,974 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-31 22:17:22,986 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-31 22:17:22,987 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-31 22:17:22,988 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-31 22:17:22,989 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-31 22:17:22,991 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-31 22:17:22,992 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-31 22:17:22,993 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-31 22:17:22,993 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-31 22:17:22,994 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-31 22:17:22,994 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-31 22:17:22,995 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-31 22:17:22,996 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-31 22:17:22,999 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-31 22:17:23,001 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-31 22:17:23,003 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-31 22:17:23,004 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-31 22:17:23,006 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-31 22:17:23,008 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-31 22:17:23,015 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Camel+AI_EQ_imprecise.epf [2018-01-31 22:17:23,025 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-31 22:17:23,025 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-31 22:17:23,026 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-31 22:17:23,026 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-31 22:17:23,026 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-31 22:17:23,026 INFO L133 SettingsManager]: * Deactivate Weak Equivalences=true [2018-01-31 22:17:23,027 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-31 22:17:23,027 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-31 22:17:23,027 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-31 22:17:23,028 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-31 22:17:23,028 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-31 22:17:23,028 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-31 22:17:23,028 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-31 22:17:23,028 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-31 22:17:23,029 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-31 22:17:23,029 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-31 22:17:23,029 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-31 22:17:23,029 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-31 22:17:23,029 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-31 22:17:23,030 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-31 22:17:23,030 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-31 22:17:23,030 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-31 22:17:23,030 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-31 22:17:23,030 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-31 22:17:23,030 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-31 22:17:23,031 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-31 22:17:23,031 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-31 22:17:23,031 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-31 22:17:23,031 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-31 22:17:23,031 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-31 22:17:23,032 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-31 22:17:23,032 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-31 22:17:23,032 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-01-31 22:17:23,032 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-31 22:17:23,032 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-31 22:17:23,033 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-31 22:17:23,033 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-31 22:17:23,034 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-31 22:17:23,069 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-31 22:17:23,083 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-31 22:17:23,087 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-31 22:17:23,089 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-31 22:17:23,089 INFO L276 PluginConnector]: CDTParser initialized [2018-01-31 22:17:23,090 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-memsafety/reverse_array_alloca_unsafe_false-valid-deref.i [2018-01-31 22:17:23,276 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-31 22:17:23,283 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-31 22:17:23,284 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-31 22:17:23,284 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-31 22:17:23,292 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-31 22:17:23,294 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,297 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67990aa8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23, skipping insertion in model container [2018-01-31 22:17:23,297 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,317 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-31 22:17:23,357 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-31 22:17:23,483 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-31 22:17:23,498 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-31 22:17:23,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23 WrapperNode [2018-01-31 22:17:23,504 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-31 22:17:23,505 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-31 22:17:23,505 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-31 22:17:23,505 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-31 22:17:23,519 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,519 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,531 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,531 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,535 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,538 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,540 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,541 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-31 22:17:23,542 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-31 22:17:23,542 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-31 22:17:23,542 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-31 22:17:23,543 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 10:17:23" (1/1) ... No working directory specified, using /storage/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 [2018-01-31 22:17:23,595 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-31 22:17:23,595 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-31 22:17:23,595 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-31 22:17:23,595 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-31 22:17:23,595 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-31 22:17:23,595 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-31 22:17:23,596 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-31 22:17:23,596 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-31 22:17:23,596 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-31 22:17:23,596 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-31 22:17:23,596 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-31 22:17:23,596 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-31 22:17:23,812 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-31 22:17:23,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 10:17:23 BoogieIcfgContainer [2018-01-31 22:17:23,813 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-31 22:17:23,813 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2018-01-31 22:17:23,813 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2018-01-31 22:17:23,814 INFO L276 PluginConnector]: Abstract Interpretation initialized [2018-01-31 22:17:23,814 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 10:17:23" (1/1) ... [2018-01-31 22:17:23,870 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-31 22:17:24,742 INFO L262 AbstractInterpreter]: Some error location(s) were reachable [2018-01-31 22:17:24,750 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-31 22:17:24,753 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-31 22:17:24,754 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-31 22:17:24,758 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-31 22:17:24,759 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-31 22:17:24,759 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-31 22:17:24,762 INFO L271 AbstractInterpreter]: Visited 52 different actions 166 times. Merged at 35 different actions 95 times. Never widened. Found 18 fixpoints after 9 different actions. Largest state had 38 variables. [2018-01-31 22:17:24,763 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2018-01-31 22:17:24,764 INFO L168 Benchmark]: Toolchain (without parser) took 1488.01 ms. Allocated memory was 305.1 MB in the beginning and 366.5 MB in the end (delta: 61.3 MB). Free memory was 263.2 MB in the beginning and 311.8 MB in the end (delta: -48.6 MB). Peak memory consumption was 12.8 MB. Max. memory is 5.3 GB. [2018-01-31 22:17:24,765 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 305.1 MB. Free memory is still 269.2 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-31 22:17:24,765 INFO L168 Benchmark]: CACSL2BoogieTranslator took 220.17 ms. Allocated memory is still 305.1 MB. Free memory was 262.2 MB in the beginning and 252.3 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 5.3 GB. [2018-01-31 22:17:24,766 INFO L168 Benchmark]: Boogie Preprocessor took 36.79 ms. Allocated memory is still 305.1 MB. Free memory was 252.3 MB in the beginning and 250.3 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-31 22:17:24,766 INFO L168 Benchmark]: RCFGBuilder took 271.24 ms. Allocated memory is still 305.1 MB. Free memory was 250.3 MB in the beginning and 232.3 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 5.3 GB. [2018-01-31 22:17:24,766 INFO L168 Benchmark]: Abstract Interpretation took 950.25 ms. Allocated memory was 305.1 MB in the beginning and 366.5 MB in the end (delta: 61.3 MB). Free memory was 232.3 MB in the beginning and 311.8 MB in the end (delta: -79.5 MB). There was no memory consumed. Max. memory is 5.3 GB. [2018-01-31 22:17:24,768 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 305.1 MB. Free memory is still 269.2 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 220.17 ms. Allocated memory is still 305.1 MB. Free memory was 262.2 MB in the beginning and 252.3 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 36.79 ms. Allocated memory is still 305.1 MB. Free memory was 252.3 MB in the beginning and 250.3 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 271.24 ms. Allocated memory is still 305.1 MB. Free memory was 250.3 MB in the beginning and 232.3 MB in the end (delta: 18.0 MB). Peak memory consumption was 18.0 MB. Max. memory is 5.3 GB. * Abstract Interpretation took 950.25 ms. Allocated memory was 305.1 MB in the beginning and 366.5 MB in the end (delta: 61.3 MB). Free memory was 232.3 MB in the beginning and 311.8 MB in the end (delta: -79.5 MB). There was no memory consumed. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 44 LocStat_MAX_WEQGRAPH_SIZE : 0 LocStat_MAX_SIZEOF_WEQEDGELABEL : 0 LocStat_NO_SUPPORTING_EQUALITIES : 468 LocStat_NO_SUPPORTING_DISEQUALITIES : 63 LocStat_NO_DISJUNCTIONS : -88 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 56 TransStat_MAX_WEQGRAPH_SIZE : 0 TransStat_MAX_SIZEOF_WEQEDGELABEL : 0 TransStat_NO_SUPPORTING_EQUALITIES : 66 TransStat_NO_SUPPORTING_DISEQUALITIES : 9 TransStat_NO_DISJUNCTIONS : 56 TransStat_MAX_NO_DISJUNCTIONS : 2 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 1.050850 RENAME_VARIABLES(MILLISECONDS) : 0.323531 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.452490 PROJECTAWAY(MILLISECONDS) : 0.069109 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.001294 DISJOIN(MILLISECONDS) : 0.790334 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.358967 ADD_EQUALITY(MILLISECONDS) : 0.018859 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.017166 #CONJOIN_DISJUNCTIVE : 236 #RENAME_VARIABLES : 465 #UNFREEZE : 0 #CONJOIN : 292 #PROJECTAWAY : 302 #ADD_WEAK_EQUALITY : 12 #DISJOIN : 14 #RENAME_VARIABLES_DISJUNCTIVE : 463 #ADD_EQUALITY : 70 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 8 - UnprovableResult [Line: 1]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: abstract domain could reach this error location. Possible FailurePath: - UnprovableResult [Line: 540]: Unable to prove that all allocated memory was freed Unable to prove that all allocated memory was freed Reason: abstract domain could reach this error location. Possible FailurePath: [L541] int i, j, tmp; [L542] int length = __VERIFIER_nondet_int(); [L543] COND TRUE length < 1 [L543] length = 1 [L544] COND TRUE length % 2 == 0 [L544] length++ [L545] EXPR, FCALL __builtin_alloca (length*sizeof(int)) [L545] int *arr = __builtin_alloca (length*sizeof(int)); [L546] i=0 [L546] COND FALSE !(i