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/cstrlen_unsafe_false-valid-deref.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-6b94a2f [2018-01-24 19:41:44,928 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-24 19:41:44,930 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-24 19:41:44,942 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-24 19:41:44,942 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-24 19:41:44,943 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-24 19:41:44,944 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-24 19:41:44,946 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-24 19:41:44,948 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-24 19:41:44,949 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-24 19:41:44,950 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-24 19:41:44,950 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-24 19:41:44,951 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-24 19:41:44,953 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-24 19:41:44,954 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-24 19:41:44,956 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-24 19:41:44,958 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-24 19:41:44,960 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-24 19:41:44,962 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-24 19:41:44,963 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-24 19:41:44,965 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-24 19:41:44,965 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-24 19:41:44,965 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-24 19:41:44,966 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-24 19:41:44,967 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-24 19:41:44,968 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-24 19:41:44,968 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-24 19:41:44,969 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-24 19:41:44,969 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-24 19:41:44,969 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-24 19:41:44,970 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-24 19:41:44,970 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 19:41:44,980 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-24 19:41:44,980 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-24 19:41:44,981 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-24 19:41:44,981 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-24 19:41:44,982 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-24 19:41:44,982 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-24 19:41:44,982 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-24 19:41:44,982 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-24 19:41:44,982 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-24 19:41:44,983 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-24 19:41:44,983 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-24 19:41:44,983 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-24 19:41:44,984 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-24 19:41:44,984 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-24 19:41:44,984 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-24 19:41:44,984 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-01-24 19:41:44,984 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-01-24 19:41:44,985 INFO L133 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2018-01-24 19:41:44,985 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-24 19:41:44,985 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-24 19:41:44,985 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-24 19:41:44,985 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-24 19:41:44,986 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-24 19:41:44,986 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-24 19:41:44,986 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-24 19:41:44,986 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-24 19:41:44,986 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-24 19:41:44,987 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-24 19:41:44,987 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-24 19:41:44,987 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-24 19:41:44,987 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-24 19:41:44,987 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-24 19:41:44,987 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-24 19:41:44,988 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-24 19:41:44,988 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-24 19:41:44,989 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-24 19:41:44,989 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-24 19:41:45,023 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-24 19:41:45,036 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-24 19:41:45,040 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-24 19:41:45,042 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-24 19:41:45,042 INFO L276 PluginConnector]: CDTParser initialized [2018-01-24 19:41:45,043 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-memsafety/cstrlen_unsafe_false-valid-deref.i [2018-01-24 19:41:45,201 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-24 19:41:45,207 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-24 19:41:45,209 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-24 19:41:45,209 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-24 19:41:45,214 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-24 19:41:45,215 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,218 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e0b71c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45, skipping insertion in model container [2018-01-24 19:41:45,218 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,238 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-24 19:41:45,281 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-24 19:41:45,391 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-24 19:41:45,406 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-24 19:41:45,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45 WrapperNode [2018-01-24 19:41:45,412 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-24 19:41:45,413 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-24 19:41:45,413 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-24 19:41:45,413 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-24 19:41:45,430 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,431 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,441 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,442 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,445 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,448 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,449 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (1/1) ... [2018-01-24 19:41:45,450 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-24 19:41:45,451 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-24 19:41:45,451 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-24 19:41:45,451 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-24 19:41:45,452 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (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 19:41:45,495 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-24 19:41:45,495 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-24 19:41:45,495 INFO L136 BoogieDeclarations]: Found implementation of procedure build_nondet_String [2018-01-24 19:41:45,495 INFO L136 BoogieDeclarations]: Found implementation of procedure cstrlen [2018-01-24 19:41:45,495 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-24 19:41:45,495 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-24 19:41:45,495 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-24 19:41:45,496 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-24 19:41:45,496 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-24 19:41:45,496 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-24 19:41:45,496 INFO L128 BoogieDeclarations]: Found specification of procedure malloc [2018-01-24 19:41:45,496 INFO L128 BoogieDeclarations]: Found specification of procedure free [2018-01-24 19:41:45,496 INFO L128 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2018-01-24 19:41:45,496 INFO L128 BoogieDeclarations]: Found specification of procedure build_nondet_String [2018-01-24 19:41:45,497 INFO L128 BoogieDeclarations]: Found specification of procedure cstrlen [2018-01-24 19:41:45,497 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-24 19:41:45,497 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-24 19:41:45,497 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-24 19:41:45,671 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-24 19:41:45,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.01 07:41:45 BoogieIcfgContainer [2018-01-24 19:41:45,672 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-24 19:41:45,673 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-24 19:41:45,673 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-24 19:41:45,675 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-24 19:41:45,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.01 07:41:45" (1/3) ... [2018-01-24 19:41:45,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5016e160 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.01 07:41:45, skipping insertion in model container [2018-01-24 19:41:45,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.01 07:41:45" (2/3) ... [2018-01-24 19:41:45,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5016e160 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.01 07:41:45, skipping insertion in model container [2018-01-24 19:41:45,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.01 07:41:45" (3/3) ... [2018-01-24 19:41:45,678 INFO L105 eAbstractionObserver]: Analyzing ICFG cstrlen_unsafe_false-valid-deref.i [2018-01-24 19:41:45,685 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-24 19:41:45,691 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2018-01-24 19:41:45,737 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-24 19:41:45,738 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-24 19:41:45,738 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-24 19:41:45,738 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-24 19:41:45,738 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-24 19:41:45,738 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-24 19:41:45,738 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-24 19:41:45,739 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-01-24 19:41:45,739 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-24 19:41:45,757 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states. [2018-01-24 19:41:45,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-01-24 19:41:45,763 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:45,764 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:45,765 INFO L371 AbstractCegarLoop]: === Iteration 1 === [build_nondet_StringErr0RequiresViolation, build_nondet_StringErr1RequiresViolation, cstrlenErr1RequiresViolation, cstrlenErr0RequiresViolation, mainErr1RequiresViolation, mainErr2EnsuresViolation, mainErr0RequiresViolation]=== [2018-01-24 19:41:45,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1546631509, now seen corresponding path program 1 times [2018-01-24 19:41:45,771 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:45,814 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:45,814 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:45,814 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:45,814 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:45,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-24 19:41:45,876 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-24 19:41:45,960 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 19:41:45,963 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-24 19:41:45,963 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-24 19:41:45,963 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-24 19:41:45,966 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-24 19:41:45,981 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-24 19:41:45,982 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-24 19:41:45,984 INFO L87 Difference]: Start difference. First operand 37 states. Second operand 4 states. [2018-01-24 19:41:46,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-24 19:41:46,091 INFO L93 Difference]: Finished difference Result 50 states and 51 transitions. [2018-01-24 19:41:46,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-24 19:41:46,093 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2018-01-24 19:41:46,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-24 19:41:46,166 INFO L225 Difference]: With dead ends: 50 [2018-01-24 19:41:46,167 INFO L226 Difference]: Without dead ends: 33 [2018-01-24 19:41:46,171 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 19:41:46,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-01-24 19:41:46,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-01-24 19:41:46,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-01-24 19:41:46,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-01-24 19:41:46,202 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 11 [2018-01-24 19:41:46,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-24 19:41:46,202 INFO L432 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-01-24 19:41:46,203 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-24 19:41:46,203 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-01-24 19:41:46,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-01-24 19:41:46,203 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:46,203 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:46,203 INFO L371 AbstractCegarLoop]: === Iteration 2 === [build_nondet_StringErr0RequiresViolation, build_nondet_StringErr1RequiresViolation, cstrlenErr1RequiresViolation, cstrlenErr0RequiresViolation, mainErr1RequiresViolation, mainErr2EnsuresViolation, mainErr0RequiresViolation]=== [2018-01-24 19:41:46,204 INFO L82 PathProgramCache]: Analyzing trace with hash -1546631508, now seen corresponding path program 1 times [2018-01-24 19:41:46,204 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:46,205 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:46,205 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:46,206 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:46,206 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:46,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-24 19:41:46,225 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-24 19:41:46,350 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 19:41:46,350 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-24 19:41:46,351 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-24 19:41:46,351 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-24 19:41:46,353 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-24 19:41:46,353 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-24 19:41:46,353 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-24 19:41:46,354 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 5 states. [2018-01-24 19:41:46,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-24 19:41:46,408 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-01-24 19:41:46,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-24 19:41:46,409 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-01-24 19:41:46,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-24 19:41:46,410 INFO L225 Difference]: With dead ends: 33 [2018-01-24 19:41:46,411 INFO L226 Difference]: Without dead ends: 32 [2018-01-24 19:41:46,411 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-01-24 19:41:46,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-01-24 19:41:46,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-01-24 19:41:46,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-01-24 19:41:46,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2018-01-24 19:41:46,416 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 11 [2018-01-24 19:41:46,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-24 19:41:46,416 INFO L432 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2018-01-24 19:41:46,416 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-24 19:41:46,416 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2018-01-24 19:41:46,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-24 19:41:46,417 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:46,417 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:46,417 INFO L371 AbstractCegarLoop]: === Iteration 3 === [build_nondet_StringErr0RequiresViolation, build_nondet_StringErr1RequiresViolation, cstrlenErr1RequiresViolation, cstrlenErr0RequiresViolation, mainErr1RequiresViolation, mainErr2EnsuresViolation, mainErr0RequiresViolation]=== [2018-01-24 19:41:46,417 INFO L82 PathProgramCache]: Analyzing trace with hash -496824236, now seen corresponding path program 1 times [2018-01-24 19:41:46,417 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:46,419 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:46,419 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:46,419 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:46,419 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:46,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-24 19:41:46,437 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-24 19:41:46,511 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 19:41:46,511 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-24 19:41:46,512 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-01-24 19:41:46,512 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-24 19:41:46,512 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-24 19:41:46,512 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-24 19:41:46,513 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-01-24 19:41:46,513 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 8 states. [2018-01-24 19:41:46,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-24 19:41:46,667 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2018-01-24 19:41:46,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-24 19:41:46,668 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2018-01-24 19:41:46,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-24 19:41:46,669 INFO L225 Difference]: With dead ends: 32 [2018-01-24 19:41:46,670 INFO L226 Difference]: Without dead ends: 30 [2018-01-24 19:41:46,670 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-01-24 19:41:46,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-01-24 19:41:46,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-01-24 19:41:46,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-01-24 19:41:46,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-01-24 19:41:46,679 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 19 [2018-01-24 19:41:46,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-24 19:41:46,679 INFO L432 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-01-24 19:41:46,679 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-24 19:41:46,680 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-01-24 19:41:46,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-24 19:41:46,680 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:46,680 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:46,681 INFO L371 AbstractCegarLoop]: === Iteration 4 === [build_nondet_StringErr0RequiresViolation, build_nondet_StringErr1RequiresViolation, cstrlenErr1RequiresViolation, cstrlenErr0RequiresViolation, mainErr1RequiresViolation, mainErr2EnsuresViolation, mainErr0RequiresViolation]=== [2018-01-24 19:41:46,681 INFO L82 PathProgramCache]: Analyzing trace with hash -496824235, now seen corresponding path program 1 times [2018-01-24 19:41:46,681 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:46,682 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:46,682 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:46,682 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:46,682 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:46,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-24 19:41:46,701 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-24 19:41:46,902 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 19:41:46,902 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-24 19:41:46,903 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2018-01-24 19:41:46,903 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-24 19:41:46,903 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-24 19:41:46,903 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-24 19:41:46,904 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2018-01-24 19:41:46,904 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 11 states. [2018-01-24 19:41:47,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-24 19:41:47,048 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-01-24 19:41:47,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-24 19:41:47,085 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 19 [2018-01-24 19:41:47,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-24 19:41:47,089 INFO L225 Difference]: With dead ends: 37 [2018-01-24 19:41:47,089 INFO L226 Difference]: Without dead ends: 35 [2018-01-24 19:41:47,089 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2018-01-24 19:41:47,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-24 19:41:47,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31. [2018-01-24 19:41:47,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-01-24 19:41:47,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-01-24 19:41:47,095 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 19 [2018-01-24 19:41:47,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-24 19:41:47,096 INFO L432 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-01-24 19:41:47,096 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-24 19:41:47,096 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-01-24 19:41:47,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-24 19:41:47,097 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:47,097 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:47,097 INFO L371 AbstractCegarLoop]: === Iteration 5 === [build_nondet_StringErr0RequiresViolation, build_nondet_StringErr1RequiresViolation, cstrlenErr1RequiresViolation, cstrlenErr0RequiresViolation, mainErr1RequiresViolation, mainErr2EnsuresViolation, mainErr0RequiresViolation]=== [2018-01-24 19:41:47,098 INFO L82 PathProgramCache]: Analyzing trace with hash -433504008, now seen corresponding path program 1 times [2018-01-24 19:41:47,098 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:47,099 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:47,099 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:47,099 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:47,100 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:47,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-24 19:41:47,116 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-24 19:41:47,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-24 19:41:47,272 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-24 19:41:47,272 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2018-01-24 19:41:47,272 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-24 19:41:47,273 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-24 19:41:47,273 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-24 19:41:47,273 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2018-01-24 19:41:47,273 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 12 states. [2018-01-24 19:41:47,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-24 19:41:47,484 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-01-24 19:41:47,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-24 19:41:47,484 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-01-24 19:41:47,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-24 19:41:47,485 INFO L225 Difference]: With dead ends: 63 [2018-01-24 19:41:47,485 INFO L226 Difference]: Without dead ends: 51 [2018-01-24 19:41:47,486 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2018-01-24 19:41:47,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-24 19:41:47,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 46. [2018-01-24 19:41:47,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-24 19:41:47,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-01-24 19:41:47,494 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 22 [2018-01-24 19:41:47,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-24 19:41:47,494 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-01-24 19:41:47,494 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-24 19:41:47,494 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-01-24 19:41:47,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-24 19:41:47,495 INFO L314 BasicCegarLoop]: Found error trace [2018-01-24 19:41:47,495 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-24 19:41:47,496 INFO L371 AbstractCegarLoop]: === Iteration 6 === [build_nondet_StringErr0RequiresViolation, build_nondet_StringErr1RequiresViolation, cstrlenErr1RequiresViolation, cstrlenErr0RequiresViolation, mainErr1RequiresViolation, mainErr2EnsuresViolation, mainErr0RequiresViolation]=== [2018-01-24 19:41:47,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1713367686, now seen corresponding path program 1 times [2018-01-24 19:41:47,496 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-24 19:41:47,497 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:47,497 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-24 19:41:47,497 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-24 19:41:47,497 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-24 19:41:47,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-24 19:41:47,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-24 19:41:47,550 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-24 19:41:47,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.01 07:41:47 BoogieIcfgContainer [2018-01-24 19:41:47,578 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-24 19:41:47,579 INFO L168 Benchmark]: Toolchain (without parser) took 2377.54 ms. Allocated memory was 305.7 MB in the beginning and 474.5 MB in the end (delta: 168.8 MB). Free memory was 265.6 MB in the beginning and 430.6 MB in the end (delta: -165.1 MB). Peak memory consumption was 3.7 MB. Max. memory is 5.3 GB. [2018-01-24 19:41:47,580 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 305.7 MB. Free memory is still 271.5 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-24 19:41:47,580 INFO L168 Benchmark]: CACSL2BoogieTranslator took 204.20 ms. Allocated memory is still 305.7 MB. Free memory was 264.6 MB in the beginning and 254.4 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 5.3 GB. [2018-01-24 19:41:47,581 INFO L168 Benchmark]: Boogie Preprocessor took 37.43 ms. Allocated memory is still 305.7 MB. Free memory was 254.4 MB in the beginning and 253.4 MB in the end (delta: 996.1 kB). Peak memory consumption was 996.1 kB. Max. memory is 5.3 GB. [2018-01-24 19:41:47,581 INFO L168 Benchmark]: RCFGBuilder took 221.42 ms. Allocated memory is still 305.7 MB. Free memory was 252.4 MB in the beginning and 237.5 MB in the end (delta: 15.0 MB). Peak memory consumption was 15.0 MB. Max. memory is 5.3 GB. [2018-01-24 19:41:47,581 INFO L168 Benchmark]: TraceAbstraction took 1905.38 ms. Allocated memory was 305.7 MB in the beginning and 474.5 MB in the end (delta: 168.8 MB). Free memory was 237.5 MB in the beginning and 430.6 MB in the end (delta: -193.2 MB). There was no memory consumed. Max. memory is 5.3 GB. [2018-01-24 19:41:47,583 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 305.7 MB. Free memory is still 271.5 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 204.20 ms. Allocated memory is still 305.7 MB. Free memory was 264.6 MB in the beginning and 254.4 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.1 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 37.43 ms. Allocated memory is still 305.7 MB. Free memory was 254.4 MB in the beginning and 253.4 MB in the end (delta: 996.1 kB). Peak memory consumption was 996.1 kB. Max. memory is 5.3 GB. * RCFGBuilder took 221.42 ms. Allocated memory is still 305.7 MB. Free memory was 252.4 MB in the beginning and 237.5 MB in the end (delta: 15.0 MB). Peak memory consumption was 15.0 MB. Max. memory is 5.3 GB. * TraceAbstraction took 1905.38 ms. Allocated memory was 305.7 MB in the beginning and 474.5 MB in the end (delta: 168.8 MB). Free memory was 237.5 MB in the beginning and 430.6 MB in the end (delta: -193.2 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: [L557] CALL, EXPR build_nondet_String() [L541] int length = __VERIFIER_nondet_int(); [L542] COND FALSE !(length < 1) VAL [length=2] [L545] EXPR, FCALL malloc(length * sizeof(char)) VAL [length=2, malloc(length * sizeof(char))={5:0}] [L545] char* nondetString = (char*) malloc(length * sizeof(char)); VAL [length=2, malloc(length * sizeof(char))={5:0}, nondetString={5:0}] [L546] FCALL nondetString[length-1] = '\0' VAL [length=2, malloc(length * sizeof(char))={5:0}, nondetString={5:0}] [L547] RET return nondetString; VAL [\result={5:0}, length=2, malloc(length * sizeof(char))={5:0}, nondetString={5:0}] [L557] EXPR build_nondet_String() VAL [build_nondet_String()={5:0}] [L557] char* p = build_nondet_String(); [L558] CALL cstrlen(p) VAL [s={5:0}] [L551] const char *p = s; VAL [p={5:0}, s={5:0}, s={5:0}] [L552] EXPR, FCALL \read(*p) VAL [\read(*p)=4, p={5:0}, s={5:0}, s={5:0}] [L552] COND TRUE *p != '\0' [L553] p = p+2 VAL [p={5:2}, s={5:0}, s={5:0}] [L552] FCALL \read(*p) VAL [p={5:2}, s={5:0}, s={5:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 37 locations, 7 error locations. UNSAFE Result, 1.8s OverallTime, 6 OverallIterations, 2 TraceHistogramMax, 0.8s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 123 SDtfs, 96 SDslu, 410 SDs, 0 SdLazy, 316 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 48 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=46occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 9 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 104 NumberOfCodeBlocks, 104 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 77 ConstructedInterpolants, 0 QuantifiedInterpolants, 5449 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 2/2 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/cstrlen_unsafe_false-valid-deref.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-Benchmark-0-2018-01-24_19-41-47-589.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/cstrlen_unsafe_false-valid-deref.i_svcomp-DerefFreeMemtrack-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-01-24_19-41-47-589.csv Received shutdown request...