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_SmtInterpol_Array.epf -i ../../../trunk/examples/svcomp/array-memsafety/count_down_unsafe_false-valid-deref.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-ccafca9-m [2018-02-04 01:40:51,853 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-02-04 01:40:51,855 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-02-04 01:40:51,866 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-02-04 01:40:51,866 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-02-04 01:40:51,867 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-02-04 01:40:51,868 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-02-04 01:40:51,869 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-02-04 01:40:51,870 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-02-04 01:40:51,871 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-02-04 01:40:51,871 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-02-04 01:40:51,872 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-02-04 01:40:51,872 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-02-04 01:40:51,873 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-02-04 01:40:51,874 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-02-04 01:40:51,876 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-02-04 01:40:51,877 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-02-04 01:40:51,879 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-02-04 01:40:51,880 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-02-04 01:40:51,881 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-02-04 01:40:51,883 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-02-04 01:40:51,883 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-02-04 01:40:51,883 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-02-04 01:40:51,884 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-02-04 01:40:51,885 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-02-04 01:40:51,886 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-02-04 01:40:51,886 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-02-04 01:40:51,886 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-02-04 01:40:51,887 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-02-04 01:40:51,887 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-02-04 01:40:51,887 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-02-04 01:40:51,888 INFO L98 SettingsManager]: Beginning loading settings from /home/ultimate/work/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/cade18-smtinterpol/svcomp-DerefFreeMemtrack-32bit-Automizer_SmtInterpol_Array.epf [2018-02-04 01:40:51,897 INFO L110 SettingsManager]: Loading preferences was successful [2018-02-04 01:40:51,897 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-02-04 01:40:51,898 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-02-04 01:40:51,899 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-02-04 01:40:51,899 INFO L133 SettingsManager]: * Use SBE=true [2018-02-04 01:40:51,899 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-02-04 01:40:51,899 INFO L133 SettingsManager]: * sizeof long=4 [2018-02-04 01:40:51,899 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-02-04 01:40:51,899 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-02-04 01:40:51,899 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-02-04 01:40:51,900 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-02-04 01:40:51,900 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-02-04 01:40:51,900 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-02-04 01:40:51,900 INFO L133 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2018-02-04 01:40:51,900 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-02-04 01:40:51,900 INFO L133 SettingsManager]: * sizeof long double=12 [2018-02-04 01:40:51,900 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-02-04 01:40:51,901 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-02-04 01:40:51,901 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-02-04 01:40:51,901 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-02-04 01:40:51,901 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-02-04 01:40:51,901 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-02-04 01:40:51,901 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_TreeInterpolation [2018-02-04 01:40:51,929 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-02-04 01:40:51,944 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-02-04 01:40:51,948 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-02-04 01:40:51,949 INFO L271 PluginConnector]: Initializing CDTParser... [2018-02-04 01:40:51,949 INFO L276 PluginConnector]: CDTParser initialized [2018-02-04 01:40:51,950 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /home/ultimate/work/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-memsafety/count_down_unsafe_false-valid-deref.i [2018-02-04 01:40:52,071 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-02-04 01:40:52,072 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-02-04 01:40:52,073 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-02-04 01:40:52,073 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-02-04 01:40:52,080 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-02-04 01:40:52,081 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,083 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21f90007 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52, skipping insertion in model container [2018-02-04 01:40:52,083 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,097 INFO L153 Dispatcher]: Using SV-COMP mode [2018-02-04 01:40:52,126 INFO L153 Dispatcher]: Using SV-COMP mode [2018-02-04 01:40:52,210 INFO L450 PostProcessor]: Settings: Checked method=main [2018-02-04 01:40:52,223 INFO L450 PostProcessor]: Settings: Checked method=main [2018-02-04 01:40:52,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52 WrapperNode [2018-02-04 01:40:52,228 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-02-04 01:40:52,229 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-02-04 01:40:52,229 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-02-04 01:40:52,229 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-02-04 01:40:52,237 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,237 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,245 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,246 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,250 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,252 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,252 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (1/1) ... [2018-02-04 01:40:52,253 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-02-04 01:40:52,253 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-02-04 01:40:52,253 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-02-04 01:40:52,254 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-02-04 01:40:52,254 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (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 [2018-02-04 01:40:52,288 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-02-04 01:40:52,288 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-02-04 01:40:52,288 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-02-04 01:40:52,288 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-02-04 01:40:52,288 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-02-04 01:40:52,288 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-02-04 01:40:52,289 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-02-04 01:40:52,289 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-02-04 01:40:52,289 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-02-04 01:40:52,289 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-02-04 01:40:52,289 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-02-04 01:40:52,289 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-02-04 01:40:52,420 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-02-04 01:40:52,420 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.02 01:40:52 BoogieIcfgContainer [2018-02-04 01:40:52,420 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-02-04 01:40:52,421 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-02-04 01:40:52,421 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-02-04 01:40:52,422 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-02-04 01:40:52,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.02 01:40:52" (1/3) ... [2018-02-04 01:40:52,423 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4aa7ec05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.02 01:40:52, skipping insertion in model container [2018-02-04 01:40:52,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.02 01:40:52" (2/3) ... [2018-02-04 01:40:52,423 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4aa7ec05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.02 01:40:52, skipping insertion in model container [2018-02-04 01:40:52,424 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.02 01:40:52" (3/3) ... [2018-02-04 01:40:52,425 INFO L107 eAbstractionObserver]: Analyzing ICFG count_down_unsafe_false-valid-deref.i [2018-02-04 01:40:52,430 INFO L128 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:Craig_TreeInterpolation Determinization: PREDICATE_ABSTRACTION [2018-02-04 01:40:52,435 INFO L140 ceAbstractionStarter]: Appying trace abstraction to program that has 9 error locations. [2018-02-04 01:40:52,462 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-02-04 01:40:52,462 INFO L323 AbstractCegarLoop]: Hoare is false [2018-02-04 01:40:52,462 INFO L324 AbstractCegarLoop]: Compute interpolants for Craig_TreeInterpolation [2018-02-04 01:40:52,462 INFO L325 AbstractCegarLoop]: Backedges is CANONICAL [2018-02-04 01:40:52,463 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-02-04 01:40:52,463 INFO L327 AbstractCegarLoop]: Difference is false [2018-02-04 01:40:52,463 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-02-04 01:40:52,463 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-02-04 01:40:52,463 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-02-04 01:40:52,471 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-02-04 01:40:52,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-02-04 01:40:52,479 INFO L343 BasicCegarLoop]: Found error trace [2018-02-04 01:40:52,480 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-04 01:40:52,480 INFO L371 AbstractCegarLoop]: === Iteration 1 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-02-04 01:40:52,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1460855103, now seen corresponding path program 1 times [2018-02-04 01:40:52,517 INFO L67 tionRefinementEngine]: Using refinement strategy FixedTraceAbstractionRefinementStrategy [2018-02-04 01:40:52,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-02-04 01:40:52,554 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-02-04 01:40:52,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 01:40:52,599 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-02-04 01:40:52,599 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-02-04 01:40:52,600 INFO L142 lantAutomatonBuilder]: Constructing canonical interpolant automaton, with selfloop in false state [2018-02-04 01:40:52,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 01:40:52,600 INFO L182 omatonBuilderFactory]: Interpolants [48#false, 49#(not (= 0 |main_#t~malloc1.base|)), 50#(not (= 0 main_~arr~0.base)), 47#true] [2018-02-04 01:40:52,601 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 01:40:52,601 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-02-04 01:40:52,609 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-02-04 01:40:52,610 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-02-04 01:40:52,611 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 4 states. [2018-02-04 01:40:52,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-02-04 01:40:52,652 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2018-02-04 01:40:52,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-02-04 01:40:52,654 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-02-04 01:40:52,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-02-04 01:40:52,660 INFO L225 Difference]: With dead ends: 42 [2018-02-04 01:40:52,660 INFO L226 Difference]: Without dead ends: 39 [2018-02-04 01:40:52,715 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 [2018-02-04 01:40:52,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-02-04 01:40:52,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-02-04 01:40:52,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-02-04 01:40:52,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2018-02-04 01:40:52,746 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 13 [2018-02-04 01:40:52,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-02-04 01:40:52,747 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2018-02-04 01:40:52,747 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-02-04 01:40:52,747 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2018-02-04 01:40:52,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-02-04 01:40:52,747 INFO L343 BasicCegarLoop]: Found error trace [2018-02-04 01:40:52,747 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-04 01:40:52,748 INFO L371 AbstractCegarLoop]: === Iteration 2 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-02-04 01:40:52,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1955174720, now seen corresponding path program 1 times [2018-02-04 01:40:52,749 INFO L67 tionRefinementEngine]: Using refinement strategy FixedTraceAbstractionRefinementStrategy [2018-02-04 01:40:52,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-02-04 01:40:52,758 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-02-04 01:40:52,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 01:40:52,810 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-02-04 01:40:52,810 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-02-04 01:40:52,810 INFO L142 lantAutomatonBuilder]: Constructing canonical interpolant automaton, with selfloop in false state [2018-02-04 01:40:52,810 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 01:40:52,810 INFO L182 omatonBuilderFactory]: Interpolants [134#true, 135#false, 136#(= 1 (select |#valid| |main_#t~malloc1.base|)), 137#(= 1 (select |#valid| main_~arr~0.base))] [2018-02-04 01:40:52,811 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-02-04 01:40:52,812 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-02-04 01:40:52,812 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-02-04 01:40:52,812 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-02-04 01:40:52,812 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 4 states. [2018-02-04 01:40:52,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-02-04 01:40:52,858 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2018-02-04 01:40:52,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-02-04 01:40:52,858 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-02-04 01:40:52,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-02-04 01:40:52,859 INFO L225 Difference]: With dead ends: 35 [2018-02-04 01:40:52,859 INFO L226 Difference]: Without dead ends: 35 [2018-02-04 01:40:52,860 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 [2018-02-04 01:40:52,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-02-04 01:40:52,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-02-04 01:40:52,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-02-04 01:40:52,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-02-04 01:40:52,863 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 14 [2018-02-04 01:40:52,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-02-04 01:40:52,863 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-02-04 01:40:52,864 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-02-04 01:40:52,864 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-02-04 01:40:52,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-02-04 01:40:52,864 INFO L343 BasicCegarLoop]: Found error trace [2018-02-04 01:40:52,864 INFO L351 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-02-04 01:40:52,864 INFO L371 AbstractCegarLoop]: === Iteration 3 === [mainErr5RequiresViolation, mainErr3RequiresViolation, mainErr1RequiresViolation, mainErr7RequiresViolation, mainErr2RequiresViolation, mainErr4RequiresViolation, mainErr6RequiresViolation, mainErr0RequiresViolation, mainErr8EnsuresViolation]=== [2018-02-04 01:40:52,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1955174719, now seen corresponding path program 1 times [2018-02-04 01:40:52,865 INFO L67 tionRefinementEngine]: Using refinement strategy FixedTraceAbstractionRefinementStrategy [2018-02-04 01:40:52,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-02-04 01:40:52,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-02-04 01:40:52,903 INFO L410 BasicCegarLoop]: Counterexample might be feasible [2018-02-04 01:40:52,916 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.02 01:40:52 BoogieIcfgContainer [2018-02-04 01:40:52,916 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-02-04 01:40:52,916 INFO L168 Benchmark]: Toolchain (without parser) took 845.24 ms. Allocated memory was 401.1 MB in the beginning and 608.2 MB in the end (delta: 207.1 MB). Free memory was 359.1 MB in the beginning and 563.5 MB in the end (delta: -204.4 MB). Peak memory consumption was 2.7 MB. Max. memory is 5.3 GB. [2018-02-04 01:40:52,917 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 401.1 MB. Free memory is still 364.4 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-02-04 01:40:52,917 INFO L168 Benchmark]: CACSL2BoogieTranslator took 156.00 ms. Allocated memory is still 401.1 MB. Free memory was 357.8 MB in the beginning and 348.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 5.3 GB. [2018-02-04 01:40:52,918 INFO L168 Benchmark]: Boogie Preprocessor took 24.33 ms. Allocated memory is still 401.1 MB. Free memory was 348.5 MB in the beginning and 345.9 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 5.3 GB. [2018-02-04 01:40:52,918 INFO L168 Benchmark]: RCFGBuilder took 166.85 ms. Allocated memory is still 401.1 MB. Free memory was 345.9 MB in the beginning and 328.5 MB in the end (delta: 17.3 MB). Peak memory consumption was 17.3 MB. Max. memory is 5.3 GB. [2018-02-04 01:40:52,919 INFO L168 Benchmark]: TraceAbstraction took 495.35 ms. Allocated memory was 401.1 MB in the beginning and 608.2 MB in the end (delta: 207.1 MB). Free memory was 327.2 MB in the beginning and 563.5 MB in the end (delta: -236.3 MB). There was no memory consumed. Max. memory is 5.3 GB. [2018-02-04 01:40:52,920 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 401.1 MB. Free memory is still 364.4 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 156.00 ms. Allocated memory is still 401.1 MB. Free memory was 357.8 MB in the beginning and 348.5 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 24.33 ms. Allocated memory is still 401.1 MB. Free memory was 348.5 MB in the beginning and 345.9 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 5.3 GB. * RCFGBuilder took 166.85 ms. Allocated memory is still 401.1 MB. Free memory was 345.9 MB in the beginning and 328.5 MB in the end (delta: 17.3 MB). Peak memory consumption was 17.3 MB. Max. memory is 5.3 GB. * TraceAbstraction took 495.35 ms. Allocated memory was 401.1 MB in the beginning and 608.2 MB in the end (delta: 207.1 MB). Free memory was 327.2 MB in the beginning and 563.5 MB in the end (delta: -236.3 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