java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AbstractInterpretationInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_oct_cong.epf -i ../../../trunk/examples/programs/heapseparator/speedup-poc-dd-4-unlimited.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-1de736e-m [2019-02-15 11:39:45,603 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-02-15 11:39:45,605 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-02-15 11:39:45,617 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-02-15 11:39:45,618 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-02-15 11:39:45,619 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-02-15 11:39:45,620 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-02-15 11:39:45,622 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-02-15 11:39:45,624 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-02-15 11:39:45,625 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-02-15 11:39:45,626 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-02-15 11:39:45,626 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-02-15 11:39:45,627 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-02-15 11:39:45,628 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-02-15 11:39:45,629 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-02-15 11:39:45,630 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-02-15 11:39:45,631 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-02-15 11:39:45,633 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-02-15 11:39:45,635 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2019-02-15 11:39:45,637 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-02-15 11:39:45,638 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-02-15 11:39:45,639 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-02-15 11:39:45,642 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-02-15 11:39:45,642 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-02-15 11:39:45,642 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-02-15 11:39:45,643 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-02-15 11:39:45,645 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-02-15 11:39:45,645 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-02-15 11:39:45,646 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2019-02-15 11:39:45,647 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-02-15 11:39:45,648 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2019-02-15 11:39:45,648 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-02-15 11:39:45,649 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-02-15 11:39:45,649 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2019-02-15 11:39:45,650 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2019-02-15 11:39:45,651 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2019-02-15 11:39:45,651 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_oct_cong.epf [2019-02-15 11:39:45,664 INFO L110 SettingsManager]: Loading preferences was successful [2019-02-15 11:39:45,664 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-02-15 11:39:45,665 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-02-15 11:39:45,665 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-02-15 11:39:45,666 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-02-15 11:39:45,666 INFO L133 SettingsManager]: * User list type=DISABLED [2019-02-15 11:39:45,666 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-02-15 11:39:45,666 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-02-15 11:39:45,666 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-02-15 11:39:45,667 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2019-02-15 11:39:45,667 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-02-15 11:39:45,667 INFO L133 SettingsManager]: * Interval Domain=false [2019-02-15 11:39:45,668 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-02-15 11:39:45,668 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-02-15 11:39:45,668 INFO L133 SettingsManager]: * Use SBE=true [2019-02-15 11:39:45,668 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-02-15 11:39:45,669 INFO L133 SettingsManager]: * sizeof long=4 [2019-02-15 11:39:45,669 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-02-15 11:39:45,669 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-02-15 11:39:45,669 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-02-15 11:39:45,669 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-02-15 11:39:45,670 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-02-15 11:39:45,670 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-02-15 11:39:45,670 INFO L133 SettingsManager]: * sizeof long double=12 [2019-02-15 11:39:45,670 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-02-15 11:39:45,670 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-02-15 11:39:45,670 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-02-15 11:39:45,671 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-02-15 11:39:45,671 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-02-15 11:39:45,671 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-02-15 11:39:45,671 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-02-15 11:39:45,672 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-02-15 11:39:45,672 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-02-15 11:39:45,672 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-02-15 11:39:45,672 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-02-15 11:39:45,672 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-02-15 11:39:45,673 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-02-15 11:39:45,673 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-02-15 11:39:45,703 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-02-15 11:39:45,715 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-02-15 11:39:45,719 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-02-15 11:39:45,720 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-02-15 11:39:45,721 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-02-15 11:39:45,722 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/heapseparator/speedup-poc-dd-4-unlimited.bpl [2019-02-15 11:39:45,722 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/heapseparator/speedup-poc-dd-4-unlimited.bpl' [2019-02-15 11:39:45,760 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-02-15 11:39:45,761 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-02-15 11:39:45,762 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-02-15 11:39:45,762 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-02-15 11:39:45,763 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-02-15 11:39:45,778 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,789 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,814 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-02-15 11:39:45,815 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-02-15 11:39:45,815 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-02-15 11:39:45,816 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-02-15 11:39:45,827 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,827 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,829 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,829 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,832 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,836 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,837 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... [2019-02-15 11:39:45,839 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-02-15 11:39:45,839 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-02-15 11:39:45,839 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-02-15 11:39:45,839 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-02-15 11:39:45,840 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 11:39:45" (1/1) ... No working directory specified, using /storage/repos/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 [2019-02-15 11:39:45,897 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-02-15 11:39:45,897 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-02-15 11:39:46,101 INFO L281 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-02-15 11:39:46,101 INFO L286 CfgBuilder]: Removed 11 assue(true) statements. [2019-02-15 11:39:46,102 INFO L202 PluginConnector]: Adding new model speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 11:39:46 BoogieIcfgContainer [2019-02-15 11:39:46,105 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-02-15 11:39:46,106 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-02-15 11:39:46,106 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-02-15 11:39:46,106 INFO L276 PluginConnector]: Abstract Interpretation initialized [2019-02-15 11:39:46,107 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "speedup-poc-dd-4-unlimited.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 11:39:46" (1/1) ... [2019-02-15 11:39:46,152 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-02-15 11:39:46,238 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-02-15 11:39:46,261 INFO L272 AbstractInterpreter]: Visited 14 different actions 14 times. Never merged. Never widened. Performed 32 root evaluator evaluations with a maximum evaluation depth of 1. Performed 32 inverse root evaluator evaluations with a maximum inverse evaluation depth of 1. Found 4 fixpoints after 4 different actions. Largest state had 0 variables. [2019-02-15 11:39:46,263 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-02-15 11:39:46,264 INFO L168 Benchmark]: Toolchain (without parser) took 503.23 ms. Allocated memory is still 134.2 MB. Free memory was 109.5 MB in the beginning and 87.8 MB in the end (delta: 21.7 MB). Peak memory consumption was 21.7 MB. Max. memory is 7.1 GB. [2019-02-15 11:39:46,266 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.22 ms. Allocated memory is still 134.2 MB. Free memory is still 110.4 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-02-15 11:39:46,267 INFO L168 Benchmark]: Boogie Procedure Inliner took 52.49 ms. Allocated memory is still 134.2 MB. Free memory was 109.1 MB in the beginning and 107.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2019-02-15 11:39:46,268 INFO L168 Benchmark]: Boogie Preprocessor took 23.55 ms. Allocated memory is still 134.2 MB. Free memory was 107.0 MB in the beginning and 105.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2019-02-15 11:39:46,269 INFO L168 Benchmark]: RCFGBuilder took 265.80 ms. Allocated memory is still 134.2 MB. Free memory was 105.7 MB in the beginning and 95.6 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2019-02-15 11:39:46,271 INFO L168 Benchmark]: Abstract Interpretation took 157.25 ms. Allocated memory is still 134.2 MB. Free memory was 95.2 MB in the beginning and 87.8 MB in the end (delta: 7.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 7.1 GB. [2019-02-15 11:39:46,276 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.22 ms. Allocated memory is still 134.2 MB. Free memory is still 110.4 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 52.49 ms. Allocated memory is still 134.2 MB. Free memory was 109.1 MB in the beginning and 107.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.55 ms. Allocated memory is still 134.2 MB. Free memory was 107.0 MB in the beginning and 105.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 265.80 ms. Allocated memory is still 134.2 MB. Free memory was 105.7 MB in the beginning and 95.6 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 157.25 ms. Allocated memory is still 134.2 MB. Free memory was 95.2 MB in the beginning and 87.8 MB in the end (delta: 7.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 39]: Unable to prove that assertion always holds Unable to prove that assertion always holds Reason: abstract domain could reach this error location. Possible FailurePath: [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L22] #memory_int[p1] := 0; [L23] #memory_int[p2] := 0; [L24] #memory_int[p3] := 0; [L25] #memory_int[p4] := 0; [L39] assert #memory_int[p1] >= 0; - UnprovableResult [Line: 40]: Unable to prove that assertion always holds Unable to prove that assertion always holds Reason: abstract domain could reach this error location. Possible FailurePath: [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L22] #memory_int[p1] := 0; [L23] #memory_int[p2] := 0; [L24] #memory_int[p3] := 0; [L25] #memory_int[p4] := 0; [L39] assert #memory_int[p1] >= 0; [L40] assert #memory_int[p2] <= 0; - UnprovableResult [Line: 41]: Unable to prove that assertion always holds Unable to prove that assertion always holds Reason: abstract domain could reach this error location. Possible FailurePath: [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L22] #memory_int[p1] := 0; [L23] #memory_int[p2] := 0; [L24] #memory_int[p3] := 0; [L25] #memory_int[p4] := 0; [L39] assert #memory_int[p1] >= 0; [L40] assert #memory_int[p2] <= 0; [L41] assert #memory_int[p3] >= 0; - UnprovableResult [Line: 42]: Unable to prove that assertion always holds Unable to prove that assertion always holds Reason: abstract domain could reach this error location. Possible FailurePath: [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L46-L47] modifies #valid; [L46-L48] ensures old(#valid)[ptr] == 0; [L46-L49] ensures #valid == old(#valid)[ptr := 1]; [L22] #memory_int[p1] := 0; [L23] #memory_int[p2] := 0; [L24] #memory_int[p3] := 0; [L25] #memory_int[p4] := 0; [L39] assert #memory_int[p1] >= 0; [L40] assert #memory_int[p2] <= 0; [L41] assert #memory_int[p3] >= 0; [L42] assert #memory_int[p4] <= 0; RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...