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_smtcomp.epf -i ../../../trunk/examples/svcomp/array-memsafety/cstrcat_unsafe_false-valid-deref.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-6b94a2f [2018-01-25 03:57:38,153 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-25 03:57:38,155 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-25 03:57:38,169 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-25 03:57:38,169 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-25 03:57:38,170 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-25 03:57:38,171 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-25 03:57:38,172 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-25 03:57:38,174 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-25 03:57:38,175 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-25 03:57:38,176 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-25 03:57:38,176 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-25 03:57:38,177 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-25 03:57:38,178 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-25 03:57:38,179 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-25 03:57:38,182 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-25 03:57:38,184 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-25 03:57:38,186 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-25 03:57:38,187 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-25 03:57:38,189 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-25 03:57:38,191 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-25 03:57:38,197 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_smtcomp.epf [2018-01-25 03:57:38,206 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-25 03:57:38,207 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-25 03:57:38,207 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-25 03:57:38,208 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-25 03:57:38,208 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-25 03:57:38,208 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-25 03:57:38,208 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-25 03:57:38,208 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-25 03:57:38,209 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-25 03:57:38,209 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-25 03:57:38,210 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-25 03:57:38,210 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-25 03:57:38,210 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-25 03:57:38,210 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-25 03:57:38,210 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-01-25 03:57:38,211 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-01-25 03:57:38,211 INFO L133 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2018-01-25 03:57:38,211 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-25 03:57:38,211 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-25 03:57:38,211 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-25 03:57:38,212 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-25 03:57:38,212 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-25 03:57:38,212 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-25 03:57:38,212 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-25 03:57:38,212 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-25 03:57:38,213 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-25 03:57:38,213 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-25 03:57:38,213 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-25 03:57:38,213 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-25 03:57:38,213 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-01-25 03:57:38,214 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-25 03:57:38,214 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-25 03:57:38,214 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-25 03:57:38,215 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-25 03:57:38,215 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-25 03:57:38,250 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-25 03:57:38,263 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-25 03:57:38,267 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-25 03:57:38,269 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-25 03:57:38,269 INFO L276 PluginConnector]: CDTParser initialized [2018-01-25 03:57:38,270 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-memsafety/cstrcat_unsafe_false-valid-deref.i [2018-01-25 03:57:38,394 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-25 03:57:38,398 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-25 03:57:38,399 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-25 03:57:38,399 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-25 03:57:38,406 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-25 03:57:38,407 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,409 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6628dc9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38, skipping insertion in model container [2018-01-25 03:57:38,410 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,422 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-25 03:57:38,439 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-25 03:57:38,551 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-25 03:57:38,566 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-25 03:57:38,571 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38 WrapperNode [2018-01-25 03:57:38,572 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-25 03:57:38,572 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-25 03:57:38,572 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-25 03:57:38,573 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-25 03:57:38,584 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,584 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,592 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,592 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,596 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,600 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,601 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,603 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-25 03:57:38,604 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-25 03:57:38,604 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-25 03:57:38,604 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-25 03:57:38,605 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.01 03:57:38" (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 [2018-01-25 03:57:38,652 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-25 03:57:38,653 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-25 03:57:38,653 INFO L136 BoogieDeclarations]: Found implementation of procedure cstrcat [2018-01-25 03:57:38,653 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-25 03:57:38,653 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-25 03:57:38,653 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-25 03:57:38,653 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-25 03:57:38,654 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-25 03:57:38,654 INFO L128 BoogieDeclarations]: Found specification of procedure cstrcat [2018-01-25 03:57:38,654 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-25 03:57:38,654 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-25 03:57:38,654 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-25 03:57:38,796 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-25 03:57:38,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.01 03:57:38 BoogieIcfgContainer [2018-01-25 03:57:38,797 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-25 03:57:38,798 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2018-01-25 03:57:38,798 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2018-01-25 03:57:38,798 INFO L276 PluginConnector]: Abstract Interpretation initialized [2018-01-25 03:57:38,799 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.01 03:57:38" (1/1) ... [2018-01-25 03:57:38,842 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-25 03:57:47,973 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-25 03:57:47,991 INFO L268 AbstractInterpreter]: Visited 34 different actions 137 times. Merged at 19 different actions 75 times. Widened at 1 different actions 3 times. Found 13 fixpoints after 6 different actions. Largest state had 30 variables. [2018-01-25 03:57:47,993 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2018-01-25 03:57:47,994 INFO L168 Benchmark]: Toolchain (without parser) took 9599.25 ms. Allocated memory was 308.3 MB in the beginning and 1.1 GB in the end (delta: 777.5 MB). Free memory was 269.3 MB in the beginning and 346.1 MB in the end (delta: -76.8 MB). Peak memory consumption was 700.7 MB. Max. memory is 5.3 GB. [2018-01-25 03:57:47,994 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 308.3 MB. Free memory is still 274.3 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-25 03:57:47,995 INFO L168 Benchmark]: CACSL2BoogieTranslator took 173.17 ms. Allocated memory is still 308.3 MB. Free memory was 269.3 MB in the beginning and 261.2 MB in the end (delta: 8.1 MB). Peak memory consumption was 8.1 MB. Max. memory is 5.3 GB. [2018-01-25 03:57:47,995 INFO L168 Benchmark]: Boogie Preprocessor took 30.75 ms. Allocated memory is still 308.3 MB. Free memory was 261.2 MB in the beginning and 259.2 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-25 03:57:47,995 INFO L168 Benchmark]: RCFGBuilder took 193.51 ms. Allocated memory is still 308.3 MB. Free memory was 259.2 MB in the beginning and 244.6 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 5.3 GB. [2018-01-25 03:57:47,995 INFO L168 Benchmark]: Abstract Interpretation took 9195.64 ms. Allocated memory was 308.3 MB in the beginning and 1.1 GB in the end (delta: 777.5 MB). Free memory was 244.6 MB in the beginning and 346.1 MB in the end (delta: -101.5 MB). Peak memory consumption was 676.0 MB. Max. memory is 5.3 GB. [2018-01-25 03:57:47,996 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 308.3 MB. Free memory is still 274.3 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 173.17 ms. Allocated memory is still 308.3 MB. Free memory was 269.3 MB in the beginning and 261.2 MB in the end (delta: 8.1 MB). Peak memory consumption was 8.1 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 30.75 ms. Allocated memory is still 308.3 MB. Free memory was 261.2 MB in the beginning and 259.2 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 193.51 ms. Allocated memory is still 308.3 MB. Free memory was 259.2 MB in the beginning and 244.6 MB in the end (delta: 14.6 MB). Peak memory consumption was 14.6 MB. Max. memory is 5.3 GB. * Abstract Interpretation took 9195.64 ms. Allocated memory was 308.3 MB in the beginning and 1.1 GB in the end (delta: 777.5 MB). Free memory was 244.6 MB in the beginning and 346.1 MB in the end (delta: -101.5 MB). Peak memory consumption was 676.0 MB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 28 LocStat_MAX_WEQGRAPH_SIZE : 1 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 233 LocStat_NO_SUPPORTING_DISEQUALITIES : 27 LocStat_NO_DISJUNCTIONS : -56 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 40 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 53 TransStat_NO_SUPPORTING_DISEQUALITIES : 5 TransStat_NO_DISJUNCTIONS : 40 TransStat_MAX_NO_DISJUNCTIONS : 2 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 5.131039 RENAME_VARIABLES(MILLISECONDS) : 0.822209 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 2.429060 PROJECTAWAY(MILLISECONDS) : 0.124727 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.145505 DISJOIN(MILLISECONDS) : 2.209876 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.854874 ADD_EQUALITY(MILLISECONDS) : 0.033273 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.068644 #CONJOIN_DISJUNCTIVE : 234 #RENAME_VARIABLES : 505 #UNFREEZE : 0 #CONJOIN : 333 #PROJECTAWAY : 318 #ADD_WEAK_EQUALITY : 3 #DISJOIN : 76 #RENAME_VARIABLES_DISJUNCTIVE : 495 #ADD_EQUALITY : 54 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 5 - 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: [L11] char *s1; [L12] char *s2; [L13] CALL cstrcat(s1, s2) [L3] char *s = s1; [L4] FCALL \read(*s) - 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: [L11] char *s1; [L12] char *s2; [L13] CALL cstrcat(s1, s2) [L3] char *s = s1; [L4] FCALL \read(*s) - 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: [L11] char *s1; [L12] char *s2; [L13] CALL cstrcat(s1, s2) [L3] char *s = s1; [L4] EXPR, FCALL \read(*s) [L4] COND FALSE !(*s != '\0') [L6] s++ [L6] s2++ - 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: [L11] char *s1; [L12] char *s2; [L13] CALL cstrcat(s1, s2) [L3] char *s = s1; [L4] EXPR, FCALL \read(*s) [L4] COND FALSE !(*s != '\0') [L6] s++ [L6] s2++ - 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: [L11] char *s1; [L12] char *s2; [L13] CALL cstrcat(s1, s2) [L3] char *s = s1; [L4] EXPR, FCALL \read(*s) [L4] COND FALSE !(*s != '\0') [L6] EXPR s++ [L6] EXPR s2++ [L6] FCALL *s++ = *s2++ - PositiveResult [Line: 10]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds 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/cstrcat_unsafe_false-valid-deref.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ_smtcomp.epf_AbstractInterpretationC.xml/Csv-Benchmark-0-2018-01-25_03-57-48-004.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/cstrcat_unsafe_false-valid-deref.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ_smtcomp.epf_AbstractInterpretationC.xml/Csv-VPDomainBenchmark-0-2018-01-25_03-57-48-004.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/cstrcat_unsafe_false-valid-deref.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Camel+AI_EQ_smtcomp.epf_AbstractInterpretationC.xml/Csv-BenchmarkWithCounters-0-2018-01-25_03-57-48-004.csv Received shutdown request...