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/cade18-smtinterpol/svcomp-DerefFreeMemtrack-32bit-Automizer_Camel.epf -i ../../../trunk/examples/svcomp/array-memsafety/count_down_unsafe_false-valid-deref.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-a74eeac-m [2018-02-02 18:20:25,709 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-02-02 18:20:25,710 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-02-02 18:20:25,723 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-02-02 18:20:25,723 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-02-02 18:20:25,724 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-02-02 18:20:25,725 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-02-02 18:20:25,726 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-02-02 18:20:25,727 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-02-02 18:20:25,728 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-02-02 18:20:25,729 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-02-02 18:20:25,729 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-02-02 18:20:25,730 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-02-02 18:20:25,731 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-02-02 18:20:25,731 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-02-02 18:20:25,733 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-02-02 18:20:25,734 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-02-02 18:20:25,736 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-02-02 18:20:25,737 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-02-02 18:20:25,737 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-02-02 18:20:25,739 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-02-02 18:20:25,739 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-02-02 18:20:25,740 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-02-02 18:20:25,740 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-02-02 18:20:25,741 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-02-02 18:20:25,742 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-02-02 18:20:25,742 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-02-02 18:20:25,743 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-02-02 18:20:25,743 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-02-02 18:20:25,743 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-02-02 18:20:25,743 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-02-02 18:20:25,744 INFO L98 SettingsManager]: Beginning loading settings from /home/ultimate/work/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/cade18-smtinterpol/svcomp-DerefFreeMemtrack-32bit-Automizer_Camel.epf [2018-02-02 18:20:25,753 INFO L110 SettingsManager]: Loading preferences was successful [2018-02-02 18:20:25,753 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-02-02 18:20:25,754 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-02-02 18:20:25,754 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-02-02 18:20:25,755 INFO L133 SettingsManager]: * Use SBE=true [2018-02-02 18:20:25,755 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-02-02 18:20:25,755 INFO L133 SettingsManager]: * sizeof long=4 [2018-02-02 18:20:25,755 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-02-02 18:20:25,755 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-02-02 18:20:25,755 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-02-02 18:20:25,755 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-02-02 18:20:25,755 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-02-02 18:20:25,756 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-02-02 18:20:25,756 INFO L133 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2018-02-02 18:20:25,756 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-02-02 18:20:25,756 INFO L133 SettingsManager]: * sizeof long double=12 [2018-02-02 18:20:25,756 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-02-02 18:20:25,756 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-02-02 18:20:25,756 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-02-02 18:20:25,756 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-02-02 18:20:25,756 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-02-02 18:20:25,757 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-02-02 18:20:25,757 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-02-02 18:20:25,757 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-02-02 18:20:25,757 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-02-02 18:20:25,784 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-02-02 18:20:25,793 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-02-02 18:20:25,795 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-02-02 18:20:25,796 INFO L271 PluginConnector]: Initializing CDTParser... [2018-02-02 18:20:25,796 INFO L276 PluginConnector]: CDTParser initialized [2018-02-02 18:20:25,797 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /home/ultimate/work/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-memsafety/count_down_unsafe_false-valid-deref.i [2018-02-02 18:20:25,927 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-02-02 18:20:25,928 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-02-02 18:20:25,929 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-02-02 18:20:25,929 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-02-02 18:20:25,934 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-02-02 18:20:25,935 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.02 06:20:25" (1/1) ... [2018-02-02 18:20:25,937 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d1bdbed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:25, skipping insertion in model container [2018-02-02 18:20:25,938 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.02 06:20:25" (1/1) ... [2018-02-02 18:20:25,952 INFO L153 Dispatcher]: Using SV-COMP mode [2018-02-02 18:20:25,982 INFO L153 Dispatcher]: Using SV-COMP mode [2018-02-02 18:20:26,077 INFO L450 PostProcessor]: Settings: Checked method=main [2018-02-02 18:20:26,088 INFO L450 PostProcessor]: Settings: Checked method=main [2018-02-02 18:20:26,093 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26 WrapperNode [2018-02-02 18:20:26,093 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-02-02 18:20:26,093 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-02-02 18:20:26,094 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-02-02 18:20:26,094 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-02-02 18:20:26,106 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (1/1) ... [2018-02-02 18:20:26,106 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (1/1) ... [2018-02-02 18:20:26,113 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (1/1) ... [2018-02-02 18:20:26,113 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (1/1) ... [2018-02-02 18:20:26,115 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (1/1) ... [2018-02-02 18:20:26,117 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (1/1) ... [2018-02-02 18:20:26,118 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (1/1) ... [2018-02-02 18:20:26,120 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-02-02 18:20:26,120 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-02-02 18:20:26,120 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-02-02 18:20:26,120 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-02-02 18:20:26,121 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (1/1) ... No working directory specified, using /home/ultimate/work/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 [2018-02-02 18:20:26,157 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-02-02 18:20:26,157 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-02-02 18:20:26,157 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-02-02 18:20:26,157 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-02-02 18:20:26,157 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-02-02 18:20:26,158 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-02-02 18:20:26,158 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-02-02 18:20:26,158 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-02-02 18:20:26,158 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-02-02 18:20:26,158 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-02-02 18:20:26,158 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-02-02 18:20:26,158 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-02-02 18:20:26,306 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-02-02 18:20:26,307 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.02 06:20:26 BoogieIcfgContainer [2018-02-02 18:20:26,307 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-02-02 18:20:26,307 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-02-02 18:20:26,308 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-02-02 18:20:26,310 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-02-02 18:20:26,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.02 06:20:25" (1/3) ... [2018-02-02 18:20:26,310 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@196c1109 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.02 06:20:26, skipping insertion in model container [2018-02-02 18:20:26,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.02 06:20:26" (2/3) ... [2018-02-02 18:20:26,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@196c1109 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.02 06:20:26, skipping insertion in model container [2018-02-02 18:20:26,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.02 06:20:26" (3/3) ... [2018-02-02 18:20:26,312 INFO L107 eAbstractionObserver]: Analyzing ICFG count_down_unsafe_false-valid-deref.i [2018-02-02 18:20:26,318 INFO L128 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-02-02 18:20:26,322 INFO L140 ceAbstractionStarter]: Appying trace abstraction to program that has 9 error locations. [2018-02-02 18:20:26,351 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-02-02 18:20:26,352 INFO L323 AbstractCegarLoop]: Hoare is false [2018-02-02 18:20:26,352 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-02-02 18:20:26,352 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-02-02 18:20:26,352 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-02-02 18:20:26,352 INFO L327 AbstractCegarLoop]: Difference is false [2018-02-02 18:20:26,352 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-02-02 18:20:26,353 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-02-02 18:20:26,353 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-02-02 18:20:26,366 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-02-02 18:20:26,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-02-02 18:20:26,375 INFO L343 BasicCegarLoop]: Found error trace [2018-02-02 18:20:26,376 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-02 18:20:26,377 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-02-02 18:20:26,381 INFO L82 PathProgramCache]: Analyzing trace with hash 1460855103, now seen corresponding path program 1 times [2018-02-02 18:20:26,382 INFO L213 onRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-02-02 18:20:26,382 INFO L67 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-02-02 18:20:26,416 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-02 18:20:26,416 INFO L109 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-02-02 18:20:26,416 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-02 18:20:26,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-02-02 18:20:26,462 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-02-02 18:20:26,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-02 18:20:26,513 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-02-02 18:20:26,514 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-02-02 18:20:26,515 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-02-02 18:20:26,522 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-02-02 18:20:26,523 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-02-02 18:20:26,524 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 4 states. [2018-02-02 18:20:26,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-02-02 18:20:26,592 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2018-02-02 18:20:26,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-02-02 18:20:26,594 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-02-02 18:20:26,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-02-02 18:20:26,599 INFO L225 Difference]: With dead ends: 42 [2018-02-02 18:20:26,600 INFO L226 Difference]: Without dead ends: 39 [2018-02-02 18:20:26,645 INFO L554 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 [2018-02-02 18:20:26,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-02-02 18:20:26,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-02-02 18:20:26,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-02-02 18:20:26,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2018-02-02 18:20:26,668 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 13 [2018-02-02 18:20:26,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-02-02 18:20:26,668 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2018-02-02 18:20:26,668 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-02-02 18:20:26,668 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2018-02-02 18:20:26,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-02-02 18:20:26,669 INFO L343 BasicCegarLoop]: Found error trace [2018-02-02 18:20:26,669 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-02 18:20:26,669 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-02-02 18:20:26,669 INFO L82 PathProgramCache]: Analyzing trace with hash -1955174720, now seen corresponding path program 1 times [2018-02-02 18:20:26,669 INFO L213 onRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-02-02 18:20:26,669 INFO L67 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-02-02 18:20:26,670 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-02 18:20:26,670 INFO L109 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-02-02 18:20:26,670 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-02 18:20:26,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-02-02 18:20:26,682 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-02-02 18:20:26,718 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-02 18:20:26,718 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-02-02 18:20:26,718 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-02-02 18:20:26,719 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-02-02 18:20:26,720 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-02-02 18:20:26,720 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-02-02 18:20:26,720 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 4 states. [2018-02-02 18:20:26,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-02-02 18:20:26,770 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2018-02-02 18:20:26,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-02-02 18:20:26,770 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-02-02 18:20:26,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-02-02 18:20:26,771 INFO L225 Difference]: With dead ends: 35 [2018-02-02 18:20:26,771 INFO L226 Difference]: Without dead ends: 35 [2018-02-02 18:20:26,772 INFO L554 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 [2018-02-02 18:20:26,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-02-02 18:20:26,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-02-02 18:20:26,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-02-02 18:20:26,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-02-02 18:20:26,774 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 14 [2018-02-02 18:20:26,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-02-02 18:20:26,774 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-02-02 18:20:26,774 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-02-02 18:20:26,774 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-02-02 18:20:26,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-02-02 18:20:26,775 INFO L343 BasicCegarLoop]: Found error trace [2018-02-02 18:20:26,775 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-02 18:20:26,775 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-02-02 18:20:26,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1955174719, now seen corresponding path program 1 times [2018-02-02 18:20:26,775 INFO L213 onRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-02-02 18:20:26,775 INFO L67 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-02-02 18:20:26,776 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-02 18:20:26,776 INFO L109 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-02-02 18:20:26,776 INFO L125 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-02-02 18:20:26,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-02-02 18:20:26,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-02-02 18:20:26,816 INFO L410 BasicCegarLoop]: Counterexample might be feasible [2018-02-02 18:20:26,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.02 06:20:26 BoogieIcfgContainer [2018-02-02 18:20:26,833 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-02-02 18:20:26,834 INFO L168 Benchmark]: Toolchain (without parser) took 907.12 ms. Allocated memory was 394.3 MB in the beginning and 590.9 MB in the end (delta: 196.6 MB). Free memory was 351.2 MB in the beginning and 545.0 MB in the end (delta: -193.9 MB). Peak memory consumption was 2.7 MB. Max. memory is 5.3 GB. [2018-02-02 18:20:26,835 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 394.3 MB. Free memory is still 356.4 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-02-02 18:20:26,836 INFO L168 Benchmark]: CACSL2BoogieTranslator took 164.58 ms. Allocated memory is still 394.3 MB. Free memory was 351.2 MB in the beginning and 340.6 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 5.3 GB. [2018-02-02 18:20:26,836 INFO L168 Benchmark]: Boogie Preprocessor took 26.60 ms. Allocated memory is still 394.3 MB. Free memory was 340.6 MB in the beginning and 337.9 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 5.3 GB. [2018-02-02 18:20:26,836 INFO L168 Benchmark]: RCFGBuilder took 186.68 ms. Allocated memory is still 394.3 MB. Free memory was 337.9 MB in the beginning and 321.3 MB in the end (delta: 16.6 MB). Peak memory consumption was 16.6 MB. Max. memory is 5.3 GB. [2018-02-02 18:20:26,837 INFO L168 Benchmark]: TraceAbstraction took 526.09 ms. Allocated memory was 394.3 MB in the beginning and 590.9 MB in the end (delta: 196.6 MB). Free memory was 321.3 MB in the beginning and 545.0 MB in the end (delta: -223.7 MB). There was no memory consumed. Max. memory is 5.3 GB. [2018-02-02 18:20:26,838 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 394.3 MB. Free memory is still 356.4 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 164.58 ms. Allocated memory is still 394.3 MB. Free memory was 351.2 MB in the beginning and 340.6 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 26.60 ms. Allocated memory is still 394.3 MB. Free memory was 340.6 MB in the beginning and 337.9 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 5.3 GB. * RCFGBuilder took 186.68 ms. Allocated memory is still 394.3 MB. Free memory was 337.9 MB in the beginning and 321.3 MB in the end (delta: 16.6 MB). Peak memory consumption was 16.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 526.09 ms. Allocated memory was 394.3 MB in the beginning and 590.9 MB in the end (delta: 196.6 MB). Free memory was 321.3 MB in the beginning and 545.0 MB in the end (delta: -223.7 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