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/svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ.epf -i ../../../trunk/examples/svcomp/array-memsafety/count_down_unsafe_false-valid-deref.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-6b94a2f [2018-01-24 13:49:47,334 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-24 13:49:47,335 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-24 13:49:47,351 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-24 13:49:47,351 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-24 13:49:47,352 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-24 13:49:47,353 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-24 13:49:47,355 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-24 13:49:47,357 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-24 13:49:47,358 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-24 13:49:47,359 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-24 13:49:47,360 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-24 13:49:47,361 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-24 13:49:47,362 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-24 13:49:47,363 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-24 13:49:47,365 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-24 13:49:47,367 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-24 13:49:47,370 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-24 13:49:47,371 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-24 13:49:47,372 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-24 13:49:47,374 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-24 13:49:47,375 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-24 13:49:47,375 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-24 13:49:47,376 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-24 13:49:47,377 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-24 13:49:47,378 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-24 13:49:47,378 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-24 13:49:47,379 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-24 13:49:47,379 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-24 13:49:47,379 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-24 13:49:47,380 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-24 13:49:47,380 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ.epf [2018-01-24 13:49:47,389 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-24 13:49:47,390 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-24 13:49:47,390 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-24 13:49:47,391 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-24 13:49:47,391 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-24 13:49:47,391 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-24 13:49:47,391 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-24 13:49:47,391 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-24 13:49:47,391 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-24 13:49:47,392 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-24 13:49:47,392 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-24 13:49:47,392 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-24 13:49:47,392 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-24 13:49:47,392 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-01-24 13:49:47,392 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-01-24 13:49:47,392 INFO L133 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2018-01-24 13:49:47,393 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-24 13:49:47,393 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-24 13:49:47,393 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-24 13:49:47,393 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-24 13:49:47,393 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-24 13:49:47,393 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-24 13:49:47,393 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-24 13:49:47,394 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-24 13:49:47,394 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-24 13:49:47,394 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-24 13:49:47,394 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-24 13:49:47,394 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-24 13:49:47,395 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-01-24 13:49:47,395 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-24 13:49:47,395 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-24 13:49:47,395 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-24 13:49:47,396 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-24 13:49:47,396 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-24 13:49:47,429 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-24 13:49:47,440 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-24 13:49:47,443 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-24 13:49:47,444 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-24 13:49:47,444 INFO L276 PluginConnector]: CDTParser initialized [2018-01-24 13:49:47,445 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-memsafety/count_down_unsafe_false-valid-deref.i [2018-01-24 13:49:47,639 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-24 13:49:47,645 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-24 13:49:47,645 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-24 13:49:47,645 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-24 13:49:47,651 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-24 13:49:47,652 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,655 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@319d8693 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47, skipping insertion in model container [2018-01-24 13:49:47,655 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,670 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-24 13:49:47,710 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-24 13:49:47,833 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-24 13:49:47,851 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-24 13:49:47,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47 WrapperNode [2018-01-24 13:49:47,858 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-24 13:49:47,859 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-24 13:49:47,859 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-24 13:49:47,859 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-24 13:49:47,876 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,877 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,886 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,886 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,890 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,894 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,895 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47" (1/1) ... [2018-01-24 13:49:47,897 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-24 13:49:47,897 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-24 13:49:47,898 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-24 13:49:47,898 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-24 13:49:47,899 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 01:49:47" (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 [2018-01-24 13:49:47,947 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-24 13:49:47,948 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-24 13:49:47,948 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-24 13:49:47,948 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-24 13:49:47,948 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-24 13:49:47,948 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-24 13:49:47,948 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-24 13:49:47,948 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-24 13:49:47,948 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-24 13:49:47,948 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-24 13:49:47,949 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-24 13:49:47,949 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-24 13:49:48,145 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-24 13:49:48,145 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.01 01:49:48 BoogieIcfgContainer [2018-01-24 13:49:48,146 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-24 13:49:48,146 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2018-01-24 13:49:48,146 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2018-01-24 13:49:48,147 INFO L276 PluginConnector]: Abstract Interpretation initialized [2018-01-24 13:49:48,148 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.01 01:49:48" (1/1) ... [2018-01-24 13:49:48,198 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-24 13:50:21,694 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-24 13:50:21,716 INFO L268 AbstractInterpreter]: Visited 50 different actions 582 times. Merged at 34 different actions 354 times. Widened at 5 different actions 25 times. Found 58 fixpoints after 14 different actions. Largest state had 26 variables. [2018-01-24 13:50:21,718 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2018-01-24 13:50:21,719 INFO L168 Benchmark]: Toolchain (without parser) took 34079.12 ms. Allocated memory was 306.7 MB in the beginning and 2.2 GB in the end (delta: 1.9 GB). Free memory was 265.7 MB in the beginning and 839.9 MB in the end (delta: -574.1 MB). Peak memory consumption was 1.3 GB. Max. memory is 5.3 GB. [2018-01-24 13:50:21,719 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 306.7 MB. Free memory is still 271.7 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-24 13:50:21,719 INFO L168 Benchmark]: CACSL2BoogieTranslator took 213.52 ms. Allocated memory is still 306.7 MB. Free memory was 265.7 MB in the beginning and 255.8 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 5.3 GB. [2018-01-24 13:50:21,720 INFO L168 Benchmark]: Boogie Preprocessor took 37.84 ms. Allocated memory is still 306.7 MB. Free memory was 255.8 MB in the beginning and 253.8 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-24 13:50:21,720 INFO L168 Benchmark]: RCFGBuilder took 248.40 ms. Allocated memory is still 306.7 MB. Free memory was 253.8 MB in the beginning and 237.2 MB in the end (delta: 16.6 MB). Peak memory consumption was 16.6 MB. Max. memory is 5.3 GB. [2018-01-24 13:50:21,720 INFO L168 Benchmark]: Abstract Interpretation took 33571.65 ms. Allocated memory was 306.7 MB in the beginning and 2.2 GB in the end (delta: 1.9 GB). Free memory was 237.2 MB in the beginning and 839.9 MB in the end (delta: -602.7 MB). Peak memory consumption was 1.3 GB. Max. memory is 5.3 GB. [2018-01-24 13:50:21,722 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 306.7 MB. Free memory is still 271.7 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 213.52 ms. Allocated memory is still 306.7 MB. Free memory was 265.7 MB in the beginning and 255.8 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 37.84 ms. Allocated memory is still 306.7 MB. Free memory was 255.8 MB in the beginning and 253.8 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 248.40 ms. Allocated memory is still 306.7 MB. Free memory was 253.8 MB in the beginning and 237.2 MB in the end (delta: 16.6 MB). Peak memory consumption was 16.6 MB. Max. memory is 5.3 GB. * Abstract Interpretation took 33571.65 ms. Allocated memory was 306.7 MB in the beginning and 2.2 GB in the end (delta: 1.9 GB). Free memory was 237.2 MB in the beginning and 839.9 MB in the end (delta: -602.7 MB). Peak memory consumption was 1.3 GB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 36 LocStat_MAX_WEQGRAPH_SIZE : 3 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 339 LocStat_NO_SUPPORTING_DISEQUALITIES : 51 LocStat_NO_DISJUNCTIONS : -72 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 54 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 59 TransStat_NO_SUPPORTING_DISEQUALITIES : 9 TransStat_NO_DISJUNCTIONS : 56 TransStat_MAX_NO_DISJUNCTIONS : 2 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 5.960545 RENAME_VARIABLES(MILLISECONDS) : 1.789229 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 2.901619 PROJECTAWAY(MILLISECONDS) : 0.222470 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.047713 DISJOIN(MILLISECONDS) : 0.822694 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 1.830932 ADD_EQUALITY(MILLISECONDS) : 0.019009 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.064540 #CONJOIN_DISJUNCTIVE : 986 #RENAME_VARIABLES : 2073 #UNFREEZE : 0 #CONJOIN : 1176 #PROJECTAWAY : 1041 #ADD_WEAK_EQUALITY : 8 #DISJOIN : 253 #RENAME_VARIABLES_DISJUNCTIVE : 2038 #ADD_EQUALITY : 60 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 8 - UnprovableResult [Line: 1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: abstract domain could reach this error location. Possible FailurePath: [L541] int i, j; [L542] int val; [L543] int length = __VERIFIER_nondet_int(); [L544] COND TRUE length < 1 [L544] length = 1 [L545] EXPR, FCALL __builtin_alloca (length) [L545] int *arr = __builtin_alloca (length); [L546] COND FALSE !(!arr) [L547] i=0 [L547] COND TRUE i 0 [L556] FCALL arr[j] - UnprovableResult [Line: 1]: Unable to prove that pointer dereference always succeeds Unable to prove that pointer dereference always succeeds Reason: abstract domain could reach this error location. Possible FailurePath: [L541] int i, j; [L542] int val; [L543] int length = __VERIFIER_nondet_int(); [L544] COND TRUE length < 1 [L544] length = 1 [L545] EXPR, FCALL __builtin_alloca (length) [L545] int *arr = __builtin_alloca (length); [L546] COND FALSE !(!arr) [L547] i=0 [L547] COND FALSE !(i 0 [L556] EXPR, FCALL arr[j] [L556] arr[j]-- - PositiveResult [Line: 1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 540]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/count_down_unsafe_false-valid-deref.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ.epf_AbstractInterpretationC.xml/Csv-Benchmark-0-2018-01-24_13-50-21-730.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/count_down_unsafe_false-valid-deref.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ.epf_AbstractInterpretationC.xml/Csv-VPDomainBenchmark-0-2018-01-24_13-50-21-730.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/count_down_unsafe_false-valid-deref.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ.epf_AbstractInterpretationC.xml/Csv-BenchmarkWithCounters-0-2018-01-24_13-50-21-730.csv Received shutdown request...