java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplTransformed.xml -s ../../../trunk/examples/settings/heapseparator/heapsep-2018-09-18.epf -i ../../../trunk/examples/programs/20181010-MemSafetyPathprograms/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-093a8c0 [2018-10-14 18:11:57,906 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-14 18:11:57,908 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-14 18:11:57,922 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-14 18:11:57,923 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-14 18:11:57,926 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-14 18:11:57,928 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-14 18:11:57,931 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-14 18:11:57,934 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-14 18:11:57,935 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-14 18:11:57,936 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-14 18:11:57,937 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-14 18:11:57,938 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-14 18:11:57,940 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-14 18:11:57,941 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-14 18:11:57,941 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-14 18:11:57,947 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-14 18:11:57,949 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-14 18:11:57,951 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-14 18:11:57,953 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-14 18:11:57,954 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-14 18:11:57,956 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-14 18:11:57,958 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-14 18:11:57,959 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-14 18:11:57,959 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-14 18:11:57,960 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-14 18:11:57,961 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-14 18:11:57,962 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-14 18:11:57,963 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-14 18:11:57,964 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-14 18:11:57,964 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-14 18:11:57,965 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-14 18:11:57,968 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/heapseparator/heapsep-2018-09-18.epf [2018-10-14 18:11:57,978 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-14 18:11:57,978 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-14 18:11:57,980 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-14 18:11:57,980 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-10-14 18:11:57,981 INFO L133 SettingsManager]: * Parallel states before merging=1 [2018-10-14 18:11:57,981 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-14 18:11:57,982 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-14 18:11:57,983 INFO L133 SettingsManager]: * Size of a code block=SingleStatement [2018-10-14 18:11:57,983 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-14 18:11:57,983 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_TreeInterpolation [2018-10-14 18:11:57,983 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-14 18:11:57,984 INFO L133 SettingsManager]: * Order in Petri net unfolding=Ken McMillan [2018-10-14 18:11:57,984 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-14 18:11:57,985 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-10-14 18:11:57,985 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-10-14 18:11:58,042 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-14 18:11:58,059 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-14 18:11:58,067 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-14 18:11:58,069 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-14 18:11:58,069 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-14 18:11:58,070 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20181010-MemSafetyPathprograms/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl [2018-10-14 18:11:58,071 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20181010-MemSafetyPathprograms/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl' [2018-10-14 18:11:58,158 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-14 18:11:58,160 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-14 18:11:58,161 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-14 18:11:58,161 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-14 18:11:58,161 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-14 18:11:58,193 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/1) ... [2018-10-14 18:11:58,196 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/1) ... [2018-10-14 18:11:58,218 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/1) ... [2018-10-14 18:11:58,219 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/1) ... [2018-10-14 18:11:58,232 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/1) ... [2018-10-14 18:11:58,236 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/1) ... [2018-10-14 18:11:58,238 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/1) ... [2018-10-14 18:11:58,246 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-14 18:11:58,247 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-14 18:11:58,247 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-14 18:11:58,248 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-14 18:11:58,250 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2018-10-14 18:11:58,326 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-10-14 18:11:58,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-14 18:11:58,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-14 18:11:58,960 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-14 18:11:58,962 INFO L202 PluginConnector]: Adding new model ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 06:11:58 BoogieIcfgContainer [2018-10-14 18:11:58,962 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-14 18:11:58,963 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2018-10-14 18:11:58,963 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2018-10-14 18:11:58,964 INFO L276 PluginConnector]: IcfgTransformer initialized [2018-10-14 18:11:58,967 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 06:11:58" (1/1) ... [2018-10-14 18:11:58,974 INFO L137 apSepIcfgTransformer]: HeapSepIcfgTransformer: Starting heap partitioning [2018-10-14 18:11:58,975 INFO L138 apSepIcfgTransformer]: To be partitioned heap arrays found [#memory_int] [2018-10-14 18:11:59,014 INFO L191 apSepIcfgTransformer]: Heap separator: starting loc-array-style preprocessing [2018-10-14 18:11:59,095 INFO L219 apSepIcfgTransformer]: finished MemlocArrayUpdater [2018-10-14 18:11:59,119 INFO L282 apSepIcfgTransformer]: finished preprocessing for the equality analysis [2018-10-14 18:11:59,189 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=1) [2018-10-14 18:12:10,975 INFO L315 AbstractInterpreter]: Visited 73 different actions 259 times. Merged at 44 different actions 178 times. Widened at 3 different actions 4 times. Found 7 fixpoints after 3 different actions. Largest state had 0 variables. [2018-10-14 18:12:10,978 INFO L306 apSepIcfgTransformer]: finished equality analysis [2018-10-14 18:12:10,983 INFO L318 apSepIcfgTransformer]: Finished detection of select terms ("array reads") [2018-10-14 18:12:11,018 WARN L152 HeapPartitionManager]: No literal set constraint found for loc-array access (select |v_#locv_ULTIMATE.start_write~int_old_#memory_int_2_1_1| |v_ULTIMATE.start_write~int_#ptr.base_6|) at (assume #memory_int == write~int_old_#memory_int[write~int_#ptr.base := write~int_old_#memory_int[write~int_#ptr.base][write~int_#ptr.offset := write~int_#value]];) [2018-10-14 18:12:11,023 WARN L152 HeapPartitionManager]: No literal set constraint found for loc-array access (select |#loc_#memory_int_(Array-Int-#locsort1)| |v_ULTIMATE.start_read~int_#ptr.base_8|) at (assume #memory_int[read~int_#ptr.base][read~int_#ptr.offset] == read~int_#value;) [2018-10-14 18:12:11,023 WARN L152 HeapPartitionManager]: No literal set constraint found for loc-array access (select (select |#loc_#memory_int_(Array-Int-(Array-Int-#locsort2))| |v_ULTIMATE.start_read~int_#ptr.base_8|) |v_ULTIMATE.start_read~int_#ptr.offset_5|) at (assume #memory_int[read~int_#ptr.base][read~int_#ptr.offset] == read~int_#value;) [2018-10-14 18:12:11,025 INFO L232 HeapPartitionManager]: partitioning result: [2018-10-14 18:12:11,025 INFO L237 HeapPartitionManager]: location blocks for array group [#memory_int, ULTIMATE.start_write~int_old_#memory_int] [2018-10-14 18:12:11,025 INFO L246 HeapPartitionManager]: at dimension 1 [2018-10-14 18:12:11,029 INFO L247 HeapPartitionManager]: # array writes (possibly including 1 dummy write/NoStoreIndexInfo) : 1 [2018-10-14 18:12:11,029 INFO L248 HeapPartitionManager]: # location blocks :1 [2018-10-14 18:12:11,029 INFO L246 HeapPartitionManager]: at dimension 2 [2018-10-14 18:12:11,030 INFO L247 HeapPartitionManager]: # array writes (possibly including 1 dummy write/NoStoreIndexInfo) : 1 [2018-10-14 18:12:11,030 INFO L248 HeapPartitionManager]: # location blocks :1 [2018-10-14 18:12:11,030 INFO L237 HeapPartitionManager]: location blocks for array group [#memory_int, ULTIMATE.start_write~int_old_#memory_int] [2018-10-14 18:12:11,030 INFO L246 HeapPartitionManager]: at dimension 1 [2018-10-14 18:12:11,030 INFO L247 HeapPartitionManager]: # array writes (possibly including 1 dummy write/NoStoreIndexInfo) : 1 [2018-10-14 18:12:11,031 INFO L248 HeapPartitionManager]: # location blocks :1 [2018-10-14 18:12:11,031 INFO L246 HeapPartitionManager]: at dimension 2 [2018-10-14 18:12:11,031 INFO L247 HeapPartitionManager]: # array writes (possibly including 1 dummy write/NoStoreIndexInfo) : 1 [2018-10-14 18:12:11,033 INFO L248 HeapPartitionManager]: # location blocks :1 [2018-10-14 18:12:11,034 INFO L145 ransitionTransformer]: executing heap partitioning transformation [2018-10-14 18:12:11,063 INFO L202 PluginConnector]: Adding new model ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 14.10 06:12:11 BasicIcfg [2018-10-14 18:12:11,064 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2018-10-14 18:12:11,065 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-14 18:12:11,065 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-14 18:12:11,070 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-14 18:12:11,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 14.10 06:11:58" (1/3) ... [2018-10-14 18:12:11,071 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4da19bb4 and model type ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 06:12:11, skipping insertion in model container [2018-10-14 18:12:11,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 06:11:58" (2/3) ... [2018-10-14 18:12:11,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4da19bb4 and model type ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.10 06:12:11, skipping insertion in model container [2018-10-14 18:12:11,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 14.10 06:12:11" (3/3) ... [2018-10-14 18:12:11,074 INFO L112 eAbstractionObserver]: Analyzing ICFG memPartitionedIcfg [2018-10-14 18:12:11,085 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:Craig_TreeInterpolation Determinization: PREDICATE_ABSTRACTION [2018-10-14 18:12:11,094 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-14 18:12:11,113 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-14 18:12:11,144 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-14 18:12:11,145 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-14 18:12:11,146 INFO L383 AbstractCegarLoop]: Hoare is false [2018-10-14 18:12:11,146 INFO L384 AbstractCegarLoop]: Compute interpolants for Craig_TreeInterpolation [2018-10-14 18:12:11,147 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-14 18:12:11,147 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-14 18:12:11,147 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-14 18:12:11,147 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-14 18:12:11,147 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-14 18:12:11,163 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states. [2018-10-14 18:12:11,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-14 18:12:11,175 INFO L367 BasicCegarLoop]: Found error trace [2018-10-14 18:12:11,176 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-14 18:12:11,177 INFO L424 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-14 18:12:11,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-14 18:12:11,184 INFO L82 PathProgramCache]: Analyzing trace with hash 1993808670, now seen corresponding path program 1 times [2018-10-14 18:12:11,248 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-14 18:12:11,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-14 18:12:11,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-14 18:12:11,427 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-14 18:12:11,427 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-14 18:12:11,433 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-14 18:12:11,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-14 18:12:11,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-14 18:12:11,449 INFO L87 Difference]: Start difference. First operand 72 states. Second operand 3 states. [2018-10-14 18:12:11,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-14 18:12:11,559 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2018-10-14 18:12:11,560 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-14 18:12:11,562 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 33 [2018-10-14 18:12:11,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-14 18:12:11,572 INFO L225 Difference]: With dead ends: 110 [2018-10-14 18:12:11,572 INFO L226 Difference]: Without dead ends: 110 [2018-10-14 18:12:11,575 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-14 18:12:11,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-10-14 18:12:11,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 73. [2018-10-14 18:12:11,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-10-14 18:12:11,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2018-10-14 18:12:11,688 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 33 [2018-10-14 18:12:11,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-14 18:12:11,689 INFO L481 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2018-10-14 18:12:11,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-14 18:12:11,689 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2018-10-14 18:12:11,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-10-14 18:12:11,691 INFO L367 BasicCegarLoop]: Found error trace [2018-10-14 18:12:11,691 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-14 18:12:11,692 INFO L424 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-14 18:12:11,692 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-14 18:12:11,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1015137326, now seen corresponding path program 1 times [2018-10-14 18:12:11,693 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-14 18:12:11,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-14 18:12:11,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-14 18:12:11,920 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-14 18:12:11,921 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2018-10-14 18:12:11,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-14 18:12:11,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-14 18:12:11,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-10-14 18:12:11,923 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 5 states. [2018-10-14 18:12:12,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-14 18:12:12,263 INFO L93 Difference]: Finished difference Result 149 states and 152 transitions. [2018-10-14 18:12:12,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-14 18:12:12,265 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 58 [2018-10-14 18:12:12,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-14 18:12:12,267 INFO L225 Difference]: With dead ends: 149 [2018-10-14 18:12:12,267 INFO L226 Difference]: Without dead ends: 149 [2018-10-14 18:12:12,268 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-10-14 18:12:12,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-10-14 18:12:12,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 112. [2018-10-14 18:12:12,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-10-14 18:12:12,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2018-10-14 18:12:12,279 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 58 [2018-10-14 18:12:12,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-14 18:12:12,280 INFO L481 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2018-10-14 18:12:12,280 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-14 18:12:12,280 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2018-10-14 18:12:12,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-10-14 18:12:12,283 INFO L367 BasicCegarLoop]: Found error trace [2018-10-14 18:12:12,283 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-14 18:12:12,284 INFO L424 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-14 18:12:12,284 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-14 18:12:12,284 INFO L82 PathProgramCache]: Analyzing trace with hash -1477866082, now seen corresponding path program 2 times [2018-10-14 18:12:12,285 INFO L69 tionRefinementEngine]: Using refinement strategy FixedRefinementStrategy [2018-10-14 18:12:12,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-14 18:12:12,512 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-10-14 18:12:12,513 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2018-10-14 18:12:12,513 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2018-10-14 18:12:12,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-14 18:12:12,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-14 18:12:12,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-14 18:12:12,514 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand 6 states. [2018-10-14 18:12:12,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-14 18:12:12,807 INFO L93 Difference]: Finished difference Result 159 states and 164 transitions. [2018-10-14 18:12:12,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-14 18:12:12,808 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 83 [2018-10-14 18:12:12,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-14 18:12:12,809 INFO L225 Difference]: With dead ends: 159 [2018-10-14 18:12:12,809 INFO L226 Difference]: Without dead ends: 0 [2018-10-14 18:12:12,810 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-14 18:12:12,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-14 18:12:12,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-14 18:12:12,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-14 18:12:12,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-14 18:12:12,811 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 83 [2018-10-14 18:12:12,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-14 18:12:12,812 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-14 18:12:12,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-14 18:12:12,812 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-14 18:12:12,812 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-14 18:12:12,816 INFO L202 PluginConnector]: Adding new model ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 14.10 06:12:12 BasicIcfg [2018-10-14 18:12:12,816 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-14 18:12:12,817 INFO L168 Benchmark]: Toolchain (without parser) took 14658.46 ms. Allocated memory was 1.5 GB in the beginning and 2.7 GB in the end (delta: 1.1 GB). Free memory was 1.5 GB in the beginning and 2.6 GB in the end (delta: -1.1 GB). Peak memory consumption was 28.1 MB. Max. memory is 7.1 GB. [2018-10-14 18:12:12,819 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.23 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-14 18:12:12,819 INFO L168 Benchmark]: Boogie Preprocessor took 85.60 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-14 18:12:12,820 INFO L168 Benchmark]: RCFGBuilder took 715.11 ms. Allocated memory is still 1.5 GB. Free memory was 1.5 GB in the beginning and 1.4 GB in the end (delta: 31.7 MB). Peak memory consumption was 31.7 MB. Max. memory is 7.1 GB. [2018-10-14 18:12:12,821 INFO L168 Benchmark]: IcfgTransformer took 12101.20 ms. Allocated memory was 1.5 GB in the beginning and 2.1 GB in the end (delta: 616.6 MB). Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: -30.3 MB). Peak memory consumption was 586.2 MB. Max. memory is 7.1 GB. [2018-10-14 18:12:12,822 INFO L168 Benchmark]: TraceAbstraction took 1751.74 ms. Allocated memory was 2.1 GB in the beginning and 2.7 GB in the end (delta: 522.7 MB). Free memory was 1.4 GB in the beginning and 2.6 GB in the end (delta: -1.1 GB). There was no memory consumed. Max. memory is 7.1 GB. [2018-10-14 18:12:12,826 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.23 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 85.60 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 715.11 ms. Allocated memory is still 1.5 GB. Free memory was 1.5 GB in the beginning and 1.4 GB in the end (delta: 31.7 MB). Peak memory consumption was 31.7 MB. Max. memory is 7.1 GB. * IcfgTransformer took 12101.20 ms. Allocated memory was 1.5 GB in the beginning and 2.1 GB in the end (delta: 616.6 MB). Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: -30.3 MB). Peak memory consumption was 586.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1751.74 ms. Allocated memory was 2.1 GB in the beginning and 2.7 GB in the end (delta: 522.7 MB). Free memory was 1.4 GB in the beginning and 2.6 GB in the end (delta: -1.1 GB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 70 LocStat_MAX_WEQGRAPH_SIZE : 3 LocStat_MAX_SIZEOF_WEQEDGELABEL : 2 LocStat_NO_SUPPORTING_EQUALITIES : 1367 LocStat_NO_SUPPORTING_DISEQUALITIES : 483 LocStat_NO_DISJUNCTIONS : -140 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 73 TransStat_MAX_WEQGRAPH_SIZE : 3 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 64 TransStat_NO_SUPPORTING_DISEQUALITIES : 3 TransStat_NO_DISJUNCTIONS : 73 TransStat_MAX_NO_DISJUNCTIONS : 1 - StatisticsResult: EqPostOperator statistics APPLY_NORMAL(MILLISECONDS) : 5853.13 APPLY_RETURN(MILLISECONDS) : 0.00 #APPLY_NORMAL : 259 #APPLY_RETURN : 0 * Results from de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation: - StatisticsResult: Abstract Interpretation statistics Visited 73 different actions 259 times. Merged at 44 different actions 178 times. Widened at 3 different actions 4 times. Found 7 fixpoints after 3 different actions. Largest state had 0 variables. - StatisticsResult: HeapSeparatorStatistics #COUNT_NEW_ARRAY_VARS_[#memory_int, ULTIMATE.start_write~int_old_#memory_int] : 2 COUNT_ARRAY_WRITES_for_[#memory_int, ULTIMATE.start_write~int_old_#memory_int]_at_dim_0 : null COUNT_BLOCKS_for_[#memory_int, ULTIMATE.start_write~int_old_#memory_int]_at_dim_0 : null COUNT_ARRAY_WRITES_for_[#memory_int, ULTIMATE.start_write~int_old_#memory_int]_at_dim_1 : 1 COUNT_BLOCKS_for_[#memory_int, ULTIMATE.start_write~int_old_#memory_int]_at_dim_1 : 1 COUNT_ARRAY_READS for [#memory_int, ULTIMATE.start_write~int_old_#memory_int] : null * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 103]: assertion always holds For all program executions holds that assertion always holds at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 72 locations, 1 error locations. SAFE Result, 1.6s OverallTime, 3 OverallIterations, 2 TraceHistogramMax, 0.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 252 SDtfs, 244 SDslu, 408 SDs, 0 SdLazy, 115 SolverSat, 7 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=112occurred in iteration=2, 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, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 74 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 174 NumberOfCodeBlocks, 174 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 171 ConstructedInterpolants, 0 QuantifiedInterpolants, 28621 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 21/28 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl_heapsep-2018-09-18.epf_AutomizerBplTransformed.xml/Csv-Benchmark-0-2018-10-14_18-12-12-852.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl_heapsep-2018-09-18.epf_AutomizerBplTransformed.xml/Csv-VPDomainBenchmark-0-2018-10-14_18-12-12-852.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/ArraysWithLenghtAtDeclaration_false-valid-deref-read.c_11.bpl_heapsep-2018-09-18.epf_AutomizerBplTransformed.xml/Csv-BenchmarkWithCounters-0-2018-10-14_18-12-12-852.csv The toolchain threw an exception: class java.lang.RuntimeException: java.lang.IllegalAccessException: Class de.uni_freiburg.informatik.ultimate.util.csv.SimpleCsvProvider can not access a member of class de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.algorithm.AbsIntBenchmark with modifiers "private" RESULT: An exception occured during the execution of Ultimate: The toolchain threw an exception java.lang.RuntimeException: java.lang.IllegalAccessException: Class de.uni_freiburg.informatik.ultimate.util.csv.SimpleCsvProvider can not access a member of class de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.algorithm.AbsIntBenchmark with modifiers "private" at de.uni_freiburg.informatik.ultimate.util.csv.SimpleCsvProvider.constructCsvProviderReflectively(SimpleCsvProvider.java:283) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.algorithm.AbsIntBenchmark.createCsvProvider(AbsIntBenchmark.java:42) at de.uni_freiburg.informatik.ultimate.cli.CommandLineController.writeCsvLogs(CommandLineController.java:342) at de.uni_freiburg.informatik.ultimate.cli.CommandLineController.displayToolchainResults(CommandLineController.java:325) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:343) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) Caused by: java.lang.IllegalAccessException: Class de.uni_freiburg.informatik.ultimate.util.csv.SimpleCsvProvider can not access a member of class de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.algorithm.AbsIntBenchmark with modifiers "private" at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:102) at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:296) at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:288) at java.lang.reflect.Field.get(Field.java:390) at de.uni_freiburg.informatik.ultimate.util.csv.SimpleCsvProvider.constructCsvProviderReflectively(SimpleCsvProvider.java:275) ... 6 more Received shutdown request...