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/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/svcomp-DerefFreeMemtrack-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf -i ../../../trunk/examples/svcomp/array-memsafety/count_down_unsafe_false-valid-deref.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-6b94a2f [2018-01-24 19:41:41,706 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-24 19:41:41,708 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-24 19:41:41,723 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-24 19:41:41,723 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-24 19:41:41,724 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-24 19:41:41,725 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-24 19:41:41,726 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-24 19:41:41,728 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-24 19:41:41,728 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-24 19:41:41,729 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-24 19:41:41,729 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-24 19:41:41,730 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-24 19:41:41,732 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-24 19:41:41,733 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-24 19:41:41,735 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-24 19:41:41,738 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-24 19:41:41,739 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-24 19:41:41,740 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-24 19:41:41,742 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-24 19:41:41,744 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-24 19:41:41,744 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-24 19:41:41,744 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-24 19:41:41,745 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-24 19:41:41,746 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-24 19:41:41,747 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-24 19:41:41,748 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-24 19:41:41,748 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-24 19:41:41,748 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-24 19:41:41,749 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-24 19:41:41,749 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-24 19:41:41,749 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/svcomp-DerefFreeMemtrack-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf [2018-01-24 19:41:41,760 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-24 19:41:41,760 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-24 19:41:41,761 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-24 19:41:41,761 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-24 19:41:41,761 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-24 19:41:41,761 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-24 19:41:41,762 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-24 19:41:41,762 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-24 19:41:41,762 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-24 19:41:41,763 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-24 19:41:41,763 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-24 19:41:41,763 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-24 19:41:41,763 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-24 19:41:41,763 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-24 19:41:41,764 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-24 19:41:41,764 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-01-24 19:41:41,764 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-01-24 19:41:41,764 INFO L133 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2018-01-24 19:41:41,764 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-24 19:41:41,764 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-24 19:41:41,765 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-24 19:41:41,765 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-24 19:41:41,765 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-24 19:41:41,765 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-24 19:41:41,765 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-24 19:41:41,766 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-24 19:41:41,766 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-24 19:41:41,766 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-24 19:41:41,766 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-24 19:41:41,766 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-24 19:41:41,767 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-24 19:41:41,767 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-24 19:41:41,767 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-24 19:41:41,767 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-24 19:41:41,767 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-24 19:41:41,768 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-24 19:41:41,768 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-24 19:41:41,802 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-24 19:41:41,814 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-24 19:41:41,818 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-24 19:41:41,820 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-24 19:41:41,820 INFO L276 PluginConnector]: CDTParser initialized [2018-01-24 19:41:41,821 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-memsafety/count_down_unsafe_false-valid-deref.i [2018-01-24 19:41:41,999 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-24 19:41:42,003 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-24 19:41:42,004 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-24 19:41:42,004 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-24 19:41:42,009 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-24 19:41:42,010 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.01 07:41:41" (1/1) ... [2018-01-24 19:41:42,013 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@386958ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42, skipping insertion in model container [2018-01-24 19:41:42,014 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.01 07:41:41" (1/1) ... [2018-01-24 19:41:42,027 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-24 19:41:42,064 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-24 19:41:42,183 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-24 19:41:42,199 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-24 19:41:42,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42 WrapperNode [2018-01-24 19:41:42,207 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-24 19:41:42,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-24 19:41:42,208 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-24 19:41:42,208 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-24 19:41:42,225 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (1/1) ... [2018-01-24 19:41:42,225 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (1/1) ... [2018-01-24 19:41:42,233 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (1/1) ... [2018-01-24 19:41:42,233 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (1/1) ... [2018-01-24 19:41:42,237 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (1/1) ... [2018-01-24 19:41:42,240 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (1/1) ... [2018-01-24 19:41:42,241 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (1/1) ... [2018-01-24 19:41:42,243 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-24 19:41:42,244 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-24 19:41:42,244 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-24 19:41:42,244 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-24 19:41:42,245 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (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 19:41:42,291 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-24 19:41:42,291 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-24 19:41:42,291 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-24 19:41:42,291 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-24 19:41:42,291 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-24 19:41:42,292 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-24 19:41:42,292 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-24 19:41:42,292 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-24 19:41:42,292 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-24 19:41:42,292 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-24 19:41:42,292 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-24 19:41:42,292 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-24 19:41:42,487 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-24 19:41:42,488 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.01 07:41:42 BoogieIcfgContainer [2018-01-24 19:41:42,488 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-24 19:41:42,488 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-24 19:41:42,488 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-24 19:41:42,490 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-24 19:41:42,490 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.01 07:41:41" (1/3) ... [2018-01-24 19:41:42,492 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44229d17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.01 07:41:42, skipping insertion in model container [2018-01-24 19:41:42,492 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:42" (2/3) ... [2018-01-24 19:41:42,493 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44229d17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.01 07:41:42, skipping insertion in model container [2018-01-24 19:41:42,493 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.01 07:41:42" (3/3) ... [2018-01-24 19:41:42,494 INFO L105 eAbstractionObserver]: Analyzing ICFG count_down_unsafe_false-valid-deref.i [2018-01-24 19:41:42,501 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-24 19:41:42,507 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 9 error locations. [2018-01-24 19:41:42,552 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-24 19:41:42,552 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-24 19:41:42,552 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-24 19:41:42,552 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-24 19:41:42,553 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-24 19:41:42,553 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-24 19:41:42,553 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-24 19:41:42,553 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-01-24 19:41:42,554 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-24 19:41:42,570 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-24 19:41:42,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-01-24 19:41:42,577 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:42,578 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:42,579 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-01-24 19:41:42,584 INFO L82 PathProgramCache]: Analyzing trace with hash 1460855103, now seen corresponding path program 1 times [2018-01-24 19:41:42,587 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:42,649 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:42,649 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:42,649 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:42,649 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:42,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-24 19:41:42,703 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-24 19:41:42,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-24 19:41:42,768 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-24 19:41:42,768 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-24 19:41:42,768 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-24 19:41:42,771 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-24 19:41:42,785 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-24 19:41:42,786 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-24 19:41:42,789 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 4 states. [2018-01-24 19:41:42,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-24 19:41:42,934 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2018-01-24 19:41:42,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-24 19:41:42,936 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-01-24 19:41:42,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-24 19:41:42,945 INFO L225 Difference]: With dead ends: 69 [2018-01-24 19:41:42,945 INFO L226 Difference]: Without dead ends: 39 [2018-01-24 19:41:42,948 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-24 19:41:42,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-24 19:41:42,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-24 19:41:42,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-24 19:41:42,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2018-01-24 19:41:42,975 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 13 [2018-01-24 19:41:42,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-24 19:41:42,976 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2018-01-24 19:41:42,976 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-24 19:41:42,976 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2018-01-24 19:41:42,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-01-24 19:41:42,976 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:42,977 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:42,977 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-01-24 19:41:42,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1955174720, now seen corresponding path program 1 times [2018-01-24 19:41:42,977 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:42,978 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:42,978 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:42,978 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:42,978 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:42,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-24 19:41:42,992 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-24 19:41:43,028 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-24 19:41:43,028 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-24 19:41:43,029 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-24 19:41:43,029 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-24 19:41:43,030 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-24 19:41:43,031 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-24 19:41:43,031 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-24 19:41:43,031 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 4 states. [2018-01-24 19:41:43,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-24 19:41:43,100 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2018-01-24 19:41:43,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-24 19:41:43,101 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-01-24 19:41:43,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-24 19:41:43,102 INFO L225 Difference]: With dead ends: 39 [2018-01-24 19:41:43,102 INFO L226 Difference]: Without dead ends: 35 [2018-01-24 19:41:43,103 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-24 19:41:43,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-24 19:41:43,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-01-24 19:41:43,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-01-24 19:41:43,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-01-24 19:41:43,109 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 14 [2018-01-24 19:41:43,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-24 19:41:43,110 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-01-24 19:41:43,110 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-24 19:41:43,110 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-01-24 19:41:43,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-01-24 19:41:43,111 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:43,111 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:43,111 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-01-24 19:41:43,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1955174719, now seen corresponding path program 1 times [2018-01-24 19:41:43,111 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:43,112 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:43,113 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:43,113 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:43,113 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:43,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-24 19:41:43,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-24 19:41:43,166 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-24 19:41:43,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.01 07:41:43 BoogieIcfgContainer [2018-01-24 19:41:43,190 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-24 19:41:43,192 INFO L168 Benchmark]: Toolchain (without parser) took 1191.48 ms. Allocated memory was 309.3 MB in the beginning and 471.3 MB in the end (delta: 162.0 MB). Free memory was 267.6 MB in the beginning and 423.0 MB in the end (delta: -155.4 MB). Peak memory consumption was 6.6 MB. Max. memory is 5.3 GB. [2018-01-24 19:41:43,193 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 309.3 MB. Free memory is still 273.6 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-24 19:41:43,194 INFO L168 Benchmark]: CACSL2BoogieTranslator took 203.76 ms. Allocated memory is still 309.3 MB. Free memory was 266.6 MB in the beginning and 256.5 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 5.3 GB. [2018-01-24 19:41:43,194 INFO L168 Benchmark]: Boogie Preprocessor took 35.27 ms. Allocated memory is still 309.3 MB. Free memory was 256.5 MB in the beginning and 255.5 MB in the end (delta: 996.2 kB). Peak memory consumption was 996.2 kB. Max. memory is 5.3 GB. [2018-01-24 19:41:43,194 INFO L168 Benchmark]: RCFGBuilder took 244.26 ms. Allocated memory is still 309.3 MB. Free memory was 254.5 MB in the beginning and 239.0 MB in the end (delta: 15.6 MB). Peak memory consumption was 15.6 MB. Max. memory is 5.3 GB. [2018-01-24 19:41:43,195 INFO L168 Benchmark]: TraceAbstraction took 702.04 ms. Allocated memory was 309.3 MB in the beginning and 471.3 MB in the end (delta: 162.0 MB). Free memory was 238.0 MB in the beginning and 423.0 MB in the end (delta: -185.0 MB). There was no memory consumed. Max. memory is 5.3 GB. [2018-01-24 19:41:43,198 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 309.3 MB. Free memory is still 273.6 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 203.76 ms. Allocated memory is still 309.3 MB. Free memory was 266.6 MB in the beginning and 256.5 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 35.27 ms. Allocated memory is still 309.3 MB. Free memory was 256.5 MB in the beginning and 255.5 MB in the end (delta: 996.2 kB). Peak memory consumption was 996.2 kB. Max. memory is 5.3 GB. * RCFGBuilder took 244.26 ms. Allocated memory is still 309.3 MB. Free memory was 254.5 MB in the beginning and 239.0 MB in the end (delta: 15.6 MB). Peak memory consumption was 15.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 702.04 ms. Allocated memory was 309.3 MB in the beginning and 471.3 MB in the end (delta: 162.0 MB). Free memory was 238.0 MB in the beginning and 423.0 MB in the end (delta: -185.0 MB). There was no memory consumed. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L541] int i, j; [L542] int val; [L543] int length = __VERIFIER_nondet_int(); [L544] COND TRUE length < 1 [L544] length = 1 VAL [length=1] [L545] EXPR, FCALL __builtin_alloca (length) VAL [__builtin_alloca (length)={3:0}, length=1] [L545] int *arr = __builtin_alloca (length); VAL [__builtin_alloca (length)={3:0}, arr={3:0}, length=1] [L546] COND FALSE !(!arr) [L547] i=0 VAL [__builtin_alloca (length)={3:0}, arr={3:0}, i=0, length=1] [L547] COND TRUE i