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_imprecise.epf -i ../../../trunk/examples/svcomp/forester-heap/dll-reverse_true-unreach-call_true-valid-memsafety.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-6b94a2f [2018-01-24 16:34:09,023 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-24 16:34:09,024 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-24 16:34:09,041 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-24 16:34:09,041 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-24 16:34:09,042 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-24 16:34:09,043 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-24 16:34:09,045 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-24 16:34:09,048 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-24 16:34:09,049 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-24 16:34:09,050 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-24 16:34:09,050 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-24 16:34:09,052 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-24 16:34:09,053 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-24 16:34:09,054 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-24 16:34:09,057 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-24 16:34:09,059 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-24 16:34:09,061 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-24 16:34:09,063 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-24 16:34:09,064 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-24 16:34:09,066 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-24 16:34:09,072 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-24 16:34:09,073 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-24 16:34:09,074 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_imprecise.epf [2018-01-24 16:34:09,082 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-24 16:34:09,082 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-24 16:34:09,083 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-24 16:34:09,083 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-24 16:34:09,084 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-24 16:34:09,084 INFO L133 SettingsManager]: * Deactivate Weak Equivalences=true [2018-01-24 16:34:09,084 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-24 16:34:09,084 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-24 16:34:09,084 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-24 16:34:09,085 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-24 16:34:09,085 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-24 16:34:09,085 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-24 16:34:09,085 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-24 16:34:09,085 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-24 16:34:09,085 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-01-24 16:34:09,085 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-01-24 16:34:09,086 INFO L133 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2018-01-24 16:34:09,086 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-24 16:34:09,086 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-24 16:34:09,086 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-24 16:34:09,086 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-24 16:34:09,086 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-24 16:34:09,087 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-24 16:34:09,087 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-24 16:34:09,087 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-24 16:34:09,087 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-24 16:34:09,087 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-24 16:34:09,088 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-24 16:34:09,088 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-24 16:34:09,088 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-01-24 16:34:09,088 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-24 16:34:09,088 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-24 16:34:09,088 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-24 16:34:09,089 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-24 16:34:09,089 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-24 16:34:09,126 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-24 16:34:09,137 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-24 16:34:09,140 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-24 16:34:09,141 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-24 16:34:09,142 INFO L276 PluginConnector]: CDTParser initialized [2018-01-24 16:34:09,142 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/forester-heap/dll-reverse_true-unreach-call_true-valid-memsafety.i [2018-01-24 16:34:09,316 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-24 16:34:09,321 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-24 16:34:09,322 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-24 16:34:09,322 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-24 16:34:09,328 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-24 16:34:09,329 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,332 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28805b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09, skipping insertion in model container [2018-01-24 16:34:09,332 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,347 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-24 16:34:09,390 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-24 16:34:09,526 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-24 16:34:09,547 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-24 16:34:09,556 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09 WrapperNode [2018-01-24 16:34:09,556 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-24 16:34:09,557 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-24 16:34:09,557 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-24 16:34:09,558 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-24 16:34:09,573 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,573 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,584 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,584 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,591 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,596 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,598 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09" (1/1) ... [2018-01-24 16:34:09,600 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-24 16:34:09,601 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-24 16:34:09,601 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-24 16:34:09,601 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-24 16:34:09,602 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 04:34:09" (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 16:34:09,654 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-24 16:34:09,655 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-24 16:34:09,655 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-24 16:34:09,655 INFO L128 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2018-01-24 16:34:09,655 INFO L128 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2018-01-24 16:34:09,655 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-24 16:34:09,655 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-24 16:34:09,656 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-24 16:34:09,656 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-24 16:34:09,656 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-24 16:34:09,656 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-24 16:34:09,656 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-24 16:34:09,656 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-24 16:34:09,657 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2018-01-24 16:34:09,657 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-24 16:34:09,657 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-24 16:34:09,657 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-24 16:34:10,173 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-24 16:34:10,174 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.01 04:34:10 BoogieIcfgContainer [2018-01-24 16:34:10,174 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-24 16:34:10,175 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2018-01-24 16:34:10,175 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2018-01-24 16:34:10,176 INFO L276 PluginConnector]: Abstract Interpretation initialized [2018-01-24 16:34:10,177 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.01 04:34:10" (1/1) ... [2018-01-24 16:34:10,236 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-24 16:34:13,653 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-24 16:34:13,710 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-24 16:34:13,722 INFO L268 AbstractInterpreter]: Visited 176 different actions 771 times. Merged at 127 different actions 414 times. Widened at 6 different actions 7 times. Found 45 fixpoints after 24 different actions. Largest state had 63 variables. [2018-01-24 16:34:13,725 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2018-01-24 16:34:13,726 INFO L168 Benchmark]: Toolchain (without parser) took 4409.59 ms. Allocated memory was 306.2 MB in the beginning and 620.2 MB in the end (delta: 314.0 MB). Free memory was 266.1 MB in the beginning and 559.4 MB in the end (delta: -293.3 MB). Peak memory consumption was 20.7 MB. Max. memory is 5.3 GB. [2018-01-24 16:34:13,727 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 306.2 MB. Free memory is still 272.1 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-24 16:34:13,727 INFO L168 Benchmark]: CACSL2BoogieTranslator took 235.05 ms. Allocated memory is still 306.2 MB. Free memory was 265.1 MB in the beginning and 253.1 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 5.3 GB. [2018-01-24 16:34:13,727 INFO L168 Benchmark]: Boogie Preprocessor took 43.01 ms. Allocated memory is still 306.2 MB. Free memory was 253.1 MB in the beginning and 251.1 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-24 16:34:13,728 INFO L168 Benchmark]: RCFGBuilder took 573.95 ms. Allocated memory is still 306.2 MB. Free memory was 251.1 MB in the beginning and 211.7 MB in the end (delta: 39.3 MB). Peak memory consumption was 39.3 MB. Max. memory is 5.3 GB. [2018-01-24 16:34:13,728 INFO L168 Benchmark]: Abstract Interpretation took 3549.62 ms. Allocated memory was 306.2 MB in the beginning and 620.2 MB in the end (delta: 314.0 MB). Free memory was 211.7 MB in the beginning and 559.4 MB in the end (delta: -347.7 MB). There was no memory consumed. Max. memory is 5.3 GB. [2018-01-24 16:34:13,730 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 306.2 MB. Free memory is still 272.1 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 235.05 ms. Allocated memory is still 306.2 MB. Free memory was 265.1 MB in the beginning and 253.1 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.0 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 43.01 ms. Allocated memory is still 306.2 MB. Free memory was 253.1 MB in the beginning and 251.1 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 573.95 ms. Allocated memory is still 306.2 MB. Free memory was 251.1 MB in the beginning and 211.7 MB in the end (delta: 39.3 MB). Peak memory consumption was 39.3 MB. Max. memory is 5.3 GB. * Abstract Interpretation took 3549.62 ms. Allocated memory was 306.2 MB in the beginning and 620.2 MB in the end (delta: 314.0 MB). Free memory was 211.7 MB in the beginning and 559.4 MB in the end (delta: -347.7 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 : 132 LocStat_MAX_WEQGRAPH_SIZE : 0 LocStat_MAX_SIZEOF_WEQEDGELABEL : 0 LocStat_NO_SUPPORTING_EQUALITIES : 1387 LocStat_NO_SUPPORTING_DISEQUALITIES : 341 LocStat_NO_DISJUNCTIONS : -264 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 180 TransStat_MAX_WEQGRAPH_SIZE : 0 TransStat_MAX_SIZEOF_WEQEDGELABEL : 0 TransStat_NO_SUPPORTING_EQUALITIES : 261 TransStat_NO_SUPPORTING_DISEQUALITIES : 68 TransStat_NO_DISJUNCTIONS : 210 TransStat_MAX_NO_DISJUNCTIONS : 4 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 0.623676 RENAME_VARIABLES(MILLISECONDS) : 0.016677 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.420694 PROJECTAWAY(MILLISECONDS) : 1.483287 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.002782 DISJOIN(MILLISECONDS) : 0.545084 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.038709 ADD_EQUALITY(MILLISECONDS) : 0.014114 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.009026 #CONJOIN_DISJUNCTIVE : 1222 #RENAME_VARIABLES : 2483 #UNFREEZE : 0 #CONJOIN : 1608 #PROJECTAWAY : 1320 #ADD_WEAK_EQUALITY : 98 #DISJOIN : 264 #RENAME_VARIABLES_DISJUNCTIVE : 2332 #ADD_EQUALITY : 314 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 58 - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND TRUE __VERIFIER_nondet_int() [L993] EXPR, FCALL malloc(sizeof(DLL)) [L993] FCALL x->next = malloc(sizeof(DLL)) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND TRUE __VERIFIER_nondet_int() [L993] EXPR, FCALL malloc(sizeof(DLL)) [L993] FCALL x->next = malloc(sizeof(DLL)) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND TRUE __VERIFIER_nondet_int() [L993] EXPR, FCALL malloc(sizeof(DLL)) [L993] FCALL x->next = malloc(sizeof(DLL)) [L993] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND TRUE __VERIFIER_nondet_int() [L993] EXPR, FCALL malloc(sizeof(DLL)) [L993] FCALL x->next = malloc(sizeof(DLL)) [L993] EXPR, FCALL x->next [L993] FCALL x->next->prev = x - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND TRUE __VERIFIER_nondet_int() [L993] EXPR, FCALL malloc(sizeof(DLL)) [L993] FCALL x->next = malloc(sizeof(DLL)) [L993] EXPR, FCALL x->next [L993] FCALL x->next->prev = x [L993] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND TRUE __VERIFIER_nondet_int() [L993] EXPR, FCALL malloc(sizeof(DLL)) [L993] FCALL x->next = malloc(sizeof(DLL)) [L993] EXPR, FCALL x->next [L993] FCALL x->next->prev = x [L993] EXPR, FCALL x->next [L993] x = x->next [L993] FCALL x->next = ((void*)0) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND TRUE __VERIFIER_nondet_int() [L993] EXPR, FCALL malloc(sizeof(DLL)) [L993] FCALL x->next = malloc(sizeof(DLL)) [L993] EXPR, FCALL x->next [L993] FCALL x->next->prev = x [L993] EXPR, FCALL x->next [L993] x = x->next [L993] FCALL x->next = ((void*)0) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND TRUE __VERIFIER_nondet_int() [L993] EXPR, FCALL malloc(sizeof(DLL)) [L993] FCALL x->next = malloc(sizeof(DLL)) [L993] EXPR, FCALL x->next [L993] FCALL x->next->prev = x [L993] EXPR, FCALL x->next [L993] x = x->next [L993] FCALL x->next = ((void*)0) [L993] FCALL x->data = 0 - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND TRUE x->next != ((void*)0) && __VERIFIER_nondet_int() [L999] COND FALSE !(!(x != ((void*)0))) [L999] COND FALSE !(0) [L1000] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND TRUE x->next != ((void*)0) && __VERIFIER_nondet_int() [L999] COND FALSE !(!(x != ((void*)0))) [L999] COND FALSE !(0) [L1000] EXPR, FCALL x->next [L1000] x = x->next [L997] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) [L1008] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) [L1008] EXPR, FCALL x->next [L1008] FCALL x->next->prev = x - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) [L1008] EXPR, FCALL x->next [L1008] FCALL x->next->prev = x [L1008] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) [L1008] EXPR, FCALL x->next [L1008] FCALL x->next->prev = x [L1008] EXPR, FCALL x->next [L1008] x = x->next [L1008] FCALL x->next = ((void*)0) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) [L1008] EXPR, FCALL x->next [L1008] FCALL x->next->prev = x [L1008] EXPR, FCALL x->next [L1008] x = x->next [L1008] FCALL x->next = ((void*)0) - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) [L1008] EXPR, FCALL x->next [L1008] FCALL x->next->prev = x [L1008] EXPR, FCALL x->next [L1008] x = x->next [L1008] FCALL x->next = ((void*)0) [L1008] FCALL x->data = 2 - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND TRUE x != ((void*)0) [L1018] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] FCALL x->data - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND TRUE t1 == 2 [L1037] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND TRUE t1 == 2 [L1037] EXPR, FCALL x->next [L1037] FCALL x->next->data - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND TRUE t1 == 2 [L1037] EXPR, FCALL x->next [L1037] FCALL x->next->data - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) [L1008] EXPR, FCALL x->next [L1008] FCALL x->next->prev = x [L1008] EXPR, FCALL x->next [L1008] x = x->next [L1008] FCALL x->next = ((void*)0) [L1008] FCALL x->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] FCALL x->data - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND FALSE !(t1 == 2) [L1038] COND FALSE !(!(t1 != 2 || t2 == 1)) [L1038] COND FALSE !(0) [L1041] FCALL x->data - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND FALSE !(t1 == 2) [L1038] COND FALSE !(!(t1 != 2 || t2 == 1)) [L1038] COND FALSE !(0) [L1041] EXPR, FCALL x->data [L1041] COND FALSE !(x->data == 2) [L1044] FCALL x->next - UnprovableResult [Line: 982]: 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND TRUE x->next == ((void*)0) [L1008] EXPR, FCALL malloc(sizeof(DLL)) [L1008] FCALL x->next = malloc(sizeof(DLL)) [L1008] EXPR, FCALL x->next [L1008] FCALL x->next->prev = x [L1008] EXPR, FCALL x->next [L1008] x = x->next [L1008] FCALL x->next = ((void*)0) [L1008] FCALL x->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND FALSE !(x != ((void*)0)) [L1047] x = head [L1049] COND FALSE !(x != ((void*)0)) [L1056] return 0; - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND TRUE t1 == 2 [L1037] EXPR, FCALL x->next [L1037] EXPR, FCALL x->next->data [L1037] t2 = x->next->data [L1038] COND FALSE !(!(t1 != 2 || t2 == 1)) [L1038] COND FALSE !(0) [L1041] EXPR, FCALL x->data [L1041] COND TRUE x->data == 2 [L1042] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND FALSE !(t1 == 2) [L1038] COND FALSE !(!(t1 != 2 || t2 == 1)) [L1038] COND FALSE !(0) [L1041] EXPR, FCALL x->data [L1041] COND FALSE !(x->data == 2) [L1044] EXPR, FCALL x->next [L1044] x = x->next [L1032] COND FALSE !(x != ((void*)0)) [L1047] x = head [L1049] COND TRUE x != ((void*)0) [L1051] head = x [L1052] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND TRUE t1 == 2 [L1037] EXPR, FCALL x->next [L1037] EXPR, FCALL x->next->data [L1037] t2 = x->next->data [L1038] COND FALSE !(!(t1 != 2 || t2 == 1)) [L1038] COND FALSE !(0) [L1041] EXPR, FCALL x->data [L1041] COND TRUE x->data == 2 [L1042] EXPR, FCALL x->next [L1042] x = x->next [L1044] FCALL x->next - 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: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND TRUE t1 == 2 [L1037] EXPR, FCALL x->next [L1037] EXPR, FCALL x->next->data [L1037] t2 = x->next->data [L1038] COND FALSE !(!(t1 != 2 || t2 == 1)) [L1038] COND FALSE !(0) [L1041] EXPR, FCALL x->data [L1041] COND TRUE x->data == 2 [L1042] EXPR, FCALL x->next [L1042] x = x->next [L1044] EXPR, FCALL x->next [L1044] x = x->next [L1032] COND FALSE !(x != ((void*)0)) [L1047] x = head [L1049] COND TRUE x != ((void*)0) [L1051] head = x [L1052] FCALL x->next - UnprovableResult [Line: 1]: Unable to prove that free always succeeds Unable to prove that free always succeeds Reason: abstract domain could reach this error location. Possible FailurePath: [L985] EXPR, FCALL malloc(sizeof(DLL)) [L985] DLL* head = malloc(sizeof(DLL)); [L986] FCALL head->next = ((void*)0) [L987] FCALL head->prev = ((void*)0) [L988] FCALL head->data = 0 [L990] DLL* x = head; [L993] COND FALSE !(__VERIFIER_nondet_int()) [L996] x = head [L997] EXPR, FCALL x->next [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] x->next != ((void*)0) && __VERIFIER_nondet_int() [L997] COND FALSE !(x->next != ((void*)0) && __VERIFIER_nondet_int()) [L1002] COND FALSE !(!(x != ((void*)0))) [L1002] COND FALSE !(0) [L1004] FCALL x->data = 1 [L1006] EXPR, FCALL x->next [L1006] COND FALSE !(x->next == ((void*)0)) [L1011] EXPR, FCALL x->next [L1011] FCALL x->next->data = 2 [L1014] DLL* prev = ((void*)0); [L1015] x = head [L1016] COND TRUE x != ((void*)0) [L1018] EXPR, FCALL x->next [L1018] DLL* next = x->next; [L1020] FCALL x->next = prev [L1021] FCALL x->prev = next [L1023] prev = x [L1025] x = next [L1016] COND FALSE !(x != ((void*)0)) [L1028] head = prev [L1031] x = head [L1032] COND TRUE x != ((void*)0) [L1034] EXPR, FCALL x->data [L1034] int t1 = x->data; [L1035] int t2 = 0; [L1036] COND TRUE t1 == 2 [L1037] EXPR, FCALL x->next [L1037] EXPR, FCALL x->next->data [L1037] t2 = x->next->data [L1038] COND FALSE !(!(t1 != 2 || t2 == 1)) [L1038] COND FALSE !(0) [L1041] EXPR, FCALL x->data [L1041] COND TRUE x->data == 2 [L1042] EXPR, FCALL x->next [L1042] x = x->next [L1044] EXPR, FCALL x->next [L1044] x = x->next [L1032] COND FALSE !(x != ((void*)0)) [L1047] x = head [L1049] COND TRUE x != ((void*)0) [L1051] head = x [L1052] EXPR, FCALL x->next [L1052] x = x->next [L1053] FCALL free(head) - 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: 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: 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]: free always succeeds For all program executions holds that free 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: 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: 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 * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) 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/dll-reverse_true-unreach-call_true-valid-memsafety.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ_imprecise.epf_AbstractInterpretationC.xml/Csv-Benchmark-0-2018-01-24_16-34-13-744.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/dll-reverse_true-unreach-call_true-valid-memsafety.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ_imprecise.epf_AbstractInterpretationC.xml/Csv-VPDomainBenchmark-0-2018-01-24_16-34-13-744.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/dll-reverse_true-unreach-call_true-valid-memsafety.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ_imprecise.epf_AbstractInterpretationC.xml/Csv-BenchmarkWithCounters-0-2018-01-24_16-34-13-744.csv Received shutdown request...