java -ea -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/Luxembourg-WithArrays.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-4b9831f [2018-12-23 14:32:00,179 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-23 14:32:00,183 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-23 14:32:00,201 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-23 14:32:00,201 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-23 14:32:00,202 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-23 14:32:00,205 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-23 14:32:00,207 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-23 14:32:00,210 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-23 14:32:00,210 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-23 14:32:00,219 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-23 14:32:00,250 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2018-12-23 14:32:00,269 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-23 14:32:00,270 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-23 14:32:00,270 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-23 14:32:00,271 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-23 14:32:00,271 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-23 14:32:00,271 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-23 14:32:00,271 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2018-12-23 14:32:00,271 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-23 14:32:00,272 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-23 14:32:00,272 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-23 14:32:00,272 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-23 14:32:00,272 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-23 14:32:00,272 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-23 14:32:00,273 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-23 14:32:00,273 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-23 14:32:00,273 INFO L133 SettingsManager]: * Use SBE=true [2018-12-23 14:32:00,274 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-23 14:32:00,274 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-23 14:32:00,274 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-23 14:32:00,274 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-23 14:32:00,274 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-23 14:32:00,275 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-23 14:32:00,275 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-23 14:32:00,275 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-23 14:32:00,275 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-23 14:32:00,275 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-23 14:32:00,276 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-23 14:32:00,276 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-23 14:32:00,276 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-23 14:32:00,276 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-23 14:32:00,276 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-23 14:32:00,277 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-23 14:32:00,277 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-23 14:32:00,277 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-23 14:32:00,277 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-23 14:32:00,277 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-23 14:32:00,278 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-23 14:32:00,278 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-23 14:32:00,278 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-23 14:32:00,308 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-23 14:32:00,320 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-23 14:32:00,323 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-23 14:32:00,325 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-23 14:32:00,325 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-23 14:32:00,326 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/Luxembourg-WithArrays.bpl [2018-12-23 14:32:00,326 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/Luxembourg-WithArrays.bpl' [2018-12-23 14:32:00,363 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-23 14:32:00,364 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-23 14:32:00,365 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-23 14:32:00,365 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-23 14:32:00,365 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-23 14:32:00,383 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,395 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,401 WARN L165 Inliner]: Program contained no entry procedure! [2018-12-23 14:32:00,401 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-12-23 14:32:00,401 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-12-23 14:32:00,404 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-23 14:32:00,405 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-23 14:32:00,405 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-23 14:32:00,405 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-23 14:32:00,418 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,418 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,419 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,422 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,427 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,428 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/1) ... [2018-12-23 14:32:00,429 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-23 14:32:00,430 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-23 14:32:00,430 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-23 14:32:00,430 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-23 14:32:00,431 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (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: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 [2018-12-23 14:32:00,506 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2018-12-23 14:32:00,507 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-23 14:32:00,507 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-23 14:32:00,929 INFO L272 CfgBuilder]: Using library mode [2018-12-23 14:32:00,930 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-23 14:32:00,930 INFO L202 PluginConnector]: Adding new model Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 02:32:00 BoogieIcfgContainer [2018-12-23 14:32:00,930 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-23 14:32:00,931 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-23 14:32:00,931 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-23 14:32:00,935 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-23 14:32:00,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.12 02:32:00" (1/2) ... [2018-12-23 14:32:00,936 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bb055a2 and model type Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 02:32:00, skipping insertion in model container [2018-12-23 14:32:00,937 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Luxembourg-WithArrays.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 02:32:00" (2/2) ... [2018-12-23 14:32:00,938 INFO L112 eAbstractionObserver]: Analyzing ICFG Luxembourg-WithArrays.bpl [2018-12-23 14:32:00,947 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-23 14:32:00,955 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-23 14:32:00,971 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-23 14:32:01,005 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-23 14:32:01,006 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-23 14:32:01,006 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-23 14:32:01,006 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-23 14:32:01,006 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-23 14:32:01,007 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-23 14:32:01,007 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-23 14:32:01,007 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-23 14:32:01,022 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-23 14:32:01,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-23 14:32:01,028 INFO L394 BasicCegarLoop]: Found error trace [2018-12-23 14:32:01,029 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-23 14:32:01,032 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-23 14:32:01,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-23 14:32:01,039 INFO L82 PathProgramCache]: Analyzing trace with hash 30048, now seen corresponding path program 1 times [2018-12-23 14:32:01,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-23 14:32:01,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-23 14:32:01,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-23 14:32:01,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-23 14:32:01,091 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-23 14:32:01,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-23 14:32:01,500 WARN L181 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 9 [2018-12-23 14:32:01,522 INFO L273 TraceCheckUtils]: 0: Hoare triple {9#true} assume x > y;a := a[x := 0];a := a[y := 1000]; {11#(and (= (select main_a main_x) 0) (not (= main_x main_y)))} is VALID [2018-12-23 14:32:01,527 INFO L273 TraceCheckUtils]: 1: Hoare triple {11#(and (= (select main_a main_x) 0) (not (= main_x main_y)))} assume a[x] == 1000; {10#false} is VALID [2018-12-23 14:32:01,527 INFO L273 TraceCheckUtils]: 2: Hoare triple {10#false} assume !(a[y] <= 0); {10#false} is VALID [2018-12-23 14:32:01,529 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-23 14:32:01,531 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-23 14:32:01,531 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-23 14:32:01,531 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-23 14:32:01,537 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-23 14:32:01,539 INFO L84 Accepts]: Finished accepts. word is accepted. [2018-12-23 14:32:01,544 INFO L86 InductivityCheck]: Starting indutivity check of a Floyd-Hoare automaton with 3 states. [2018-12-23 14:32:01,579 INFO L119 InductivityCheck]: Floyd-Hoare automaton has 3 edges. 3 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. [2018-12-23 14:32:01,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-23 14:32:01,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-23 14:32:01,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-23 14:32:01,590 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-23 14:32:01,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-23 14:32:01,738 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-12-23 14:32:01,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-23 14:32:01,739 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-23 14:32:01,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-23 14:32:01,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2018-12-23 14:32:01,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 14 transitions. [2018-12-23 14:32:01,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3 states. [2018-12-23 14:32:01,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3 states to 3 states and 14 transitions. [2018-12-23 14:32:01,750 INFO L86 InductivityCheck]: Starting indutivity check of a Floyd-Hoare automaton with 3 states and 14 transitions. [2018-12-23 14:32:01,789 INFO L119 InductivityCheck]: Floyd-Hoare automaton has 14 edges. 14 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. [2018-12-23 14:32:01,798 INFO L225 Difference]: With dead ends: 13 [2018-12-23 14:32:01,799 INFO L226 Difference]: Without dead ends: 5 [2018-12-23 14:32:01,802 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-23 14:32:01,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-23 14:32:01,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-23 14:32:01,884 INFO L214 AbstractMinimizeNwa]: Start testing correctness of minimizeSevpa [2018-12-23 14:32:01,885 INFO L82 GeneralOperation]: Start isEquivalent. First operand 5 states. Second operand 5 states. [2018-12-23 14:32:01,886 INFO L74 IsIncluded]: Start isIncluded. First operand 5 states. Second operand 5 states. [2018-12-23 14:32:01,886 INFO L87 Difference]: Start difference. First operand 5 states. Second operand 5 states. [2018-12-23 14:32:01,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-23 14:32:01,888 INFO L93 Difference]: Finished difference Result 5 states and 5 transitions. [2018-12-23 14:32:01,888 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-23 14:32:01,888 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-23 14:32:01,889 INFO L83 IsIncluded]: Finished isIncluded. Language is included [2018-12-23 14:32:01,889 INFO L74 IsIncluded]: Start isIncluded. First operand 5 states. Second operand 5 states. [2018-12-23 14:32:01,889 INFO L87 Difference]: Start difference. First operand 5 states. Second operand 5 states. [2018-12-23 14:32:01,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-23 14:32:01,891 INFO L93 Difference]: Finished difference Result 5 states and 5 transitions. [2018-12-23 14:32:01,891 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-23 14:32:01,891 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-23 14:32:01,891 INFO L83 IsIncluded]: Finished isIncluded. Language is included [2018-12-23 14:32:01,892 INFO L88 GeneralOperation]: Finished isEquivalent. [2018-12-23 14:32:01,892 INFO L221 AbstractMinimizeNwa]: Finished testing correctness of minimizeSevpa [2018-12-23 14:32:01,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-23 14:32:01,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-23 14:32:01,895 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-23 14:32:01,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-23 14:32:01,896 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-23 14:32:01,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-23 14:32:01,896 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-23 14:32:01,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-23 14:32:01,897 INFO L394 BasicCegarLoop]: Found error trace [2018-12-23 14:32:01,897 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-23 14:32:01,897 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-23 14:32:01,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-23 14:32:01,898 INFO L82 PathProgramCache]: Analyzing trace with hash 927622, now seen corresponding path program 1 times [2018-12-23 14:32:01,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-23 14:32:01,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-23 14:32:01,899 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-23 14:32:01,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-23 14:32:01,900 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-23 14:32:01,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-23 14:32:02,406 WARN L181 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 9 [2018-12-23 14:32:02,686 WARN L181 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 10 [2018-12-23 14:32:02,777 INFO L273 TraceCheckUtils]: 0: Hoare triple {46#true} assume x > y;a := a[x := 0];a := a[y := 1000]; {48#(and (= (select main_a main_x) 0) (not (= main_x main_y)))} is VALID [2018-12-23 14:32:02,787 INFO L273 TraceCheckUtils]: 1: Hoare triple {48#(and (= (select main_a main_x) 0) (not (= main_x main_y)))} a := a[x := a[x] + 1];a := a[y := a[y] - 1]; {49#(and (not (= (select main_a main_x) 1000)) (not (= main_x main_y)))} is VALID [2018-12-23 14:32:02,806 INFO L273 TraceCheckUtils]: 2: Hoare triple {49#(and (not (= (select main_a main_x) 1000)) (not (= main_x main_y)))} assume a[x] == 1000; {47#false} is VALID [2018-12-23 14:32:02,807 INFO L273 TraceCheckUtils]: 3: Hoare triple {47#false} assume !(a[y] <= 0); {47#false} is VALID [2018-12-23 14:32:02,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-23 14:32:02,808 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-23 14:32:02,808 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-23 14:32:02,809 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-23 14:32:02,811 INFO L207 CegarAbsIntRunner]: [0], [4], [8], [9] [2018-12-23 14:32:02,876 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-23 14:32:02,876 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-23 14:32:05,836 WARN L212 ngHoareTripleChecker]: Soundness check inconclusive for the following hoare triple [2018-12-23 14:32:05,837 WARN L217 ngHoareTripleChecker]: Expected: VALID Actual: UNKNOWN [2018-12-23 14:32:05,838 WARN L219 ngHoareTripleChecker]: Solver was "Z3" in version "4.8.3" [2018-12-23 14:32:05,839 WARN L223 ngHoareTripleChecker]: -- [2018-12-23 14:32:05,839 WARN L224 ngHoareTripleChecker]: Pre: {2147483645#(forall ((v_idx_7 Int) (v_idx_8 Int) (v_idx_9 Int) (v_idx_10 Int) (v_idx_11 Int)) (exists ((v_v_2_1 Int) (v_v_3_1 Int) (v_v_4_1 Int) (v_b_2_1 Int) (v_b_3_1 Int) (v_v_5_1 Int) (v_v_6_1 Int) (v_b_0_1 Int) (v_b_1_1 Int)) (and (<= (- v_b_3_1 c_main_y) 1) (or (<= v_b_0_1 v_idx_9) (< v_idx_9 v_b_3_1) (= v_v_6_1 (select c_main_a v_idx_9))) (<= (- (- v_b_0_1) (- v_b_3_1)) 0) (or (= (select c_main_a v_idx_11) v_v_3_1) (< v_idx_11 v_b_1_1)) (<= (- v_b_0_1 c_main_x) 0) (or (< v_idx_10 v_b_0_1) (<= v_b_1_1 v_idx_10) (= (select c_main_a v_idx_10) v_v_2_1)) (<= (- v_v_2_1 (- v_v_5_1)) 1000) (or (= v_v_4_1 (select c_main_a v_idx_7)) (<= v_b_2_1 v_idx_7)) (<= (- v_v_5_1 (- v_v_5_1)) 2000) (<= (- (- v_b_2_1) (- c_main_y)) 0) (<= (- (- v_v_2_1) (- v_v_5_1)) 1000) (<= (- (- v_b_0_1) (- v_b_2_1)) (- 1)) (<= (- v_b_2_1 c_main_x) (- 1)) (or (< v_idx_8 v_b_2_1) (<= v_b_3_1 v_idx_8) (= v_v_5_1 (select c_main_a v_idx_8))) (<= (- v_b_3_1 c_main_x) 0) (<= (- v_v_2_1 (- v_v_2_1)) 0) (<= (- (- v_b_0_1) (- v_b_1_1)) 1) (<= (- (- v_b_2_1) (- v_b_3_1)) 1) (<= (- (- v_b_1_1) (- c_main_y)) (- 2)) (<= (- v_b_1_1 c_main_x) 1) (<= (- v_b_0_1 v_b_1_1) (- 1)) (<= (- v_b_2_1 v_b_3_1) (- 1)) (<= (- v_b_2_1 c_main_y) 0) (<= (- (- v_b_1_1) (- v_b_2_1)) (- 2)) (<= (- (- v_v_2_1) v_v_5_1) (- 1000)) (<= (- (- v_b_0_1) (- c_main_x)) 0) (<= (- (- v_b_3_1) (- c_main_y)) (- 1)) (<= (- (- v_b_0_1) (- c_main_y)) (- 1)) (<= (- (- v_b_1_1) (- v_b_3_1)) (- 1)) (<= (- v_v_2_1 v_v_5_1) (- 1000)) (<= (- (- v_b_1_1) (- c_main_x)) (- 1)) (<= (- (- c_main_x) (- c_main_y)) (- 1)) (<= (- (- v_v_2_1) v_v_2_1) 0) (<= (- (- v_v_5_1) v_v_5_1) (- 2000)))))} [2018-12-23 14:32:05,840 WARN L228 ngHoareTripleChecker]: Action: a := a[x := a[x] + 1];a := a[y := a[y] - 1]; [2018-12-23 14:32:05,841 WARN L184 hOps$ForEachOp$OfRef]: ActionStr: (= (store (store c_main_a c_main_x (+ (select c_main_a c_main_x) 1)) c_main_y (+ (select (store c_main_a c_main_x (+ (select c_main_a c_main_x) 1)) c_main_y) (- 1))) c_main_a_primed) [2018-12-23 14:32:05,841 WARN L230 ngHoareTripleChecker]: Post: {2147483644#(forall ((v_idx_14 Int) (v_idx_15 Int) (v_idx_12 Int) (v_idx_13 Int) (v_idx_16 Int)) (exists ((v_v_8_1 Int) (v_b_6_1 Int) (v_b_4_1 Int) (v_v_11_1 Int) (v_v_3_1 Int) (v_v_4_1 Int) (v_b_3_1 Int) (v_v_6_1 Int) (v_b_1_1 Int)) (and (<= (- v_v_11_1 v_v_8_1) 998) (<= (- v_b_3_1 c_main_y) 1) (<= (- v_v_8_1 (- v_v_8_1)) 2) (<= (- v_b_6_1 c_main_x) (- 1)) (<= (- v_b_1_1 v_b_4_1) 1) (<= (- (- v_b_1_1) (- v_b_4_1)) (- 1)) (<= (- (- v_v_11_1) v_v_8_1) (- 1000)) (<= (- (- v_v_11_1) (- v_v_8_1)) (- 998)) (<= (- (- v_b_3_1) (- v_b_6_1)) (- 1)) (or (< v_idx_15 v_b_4_1) (<= v_b_1_1 v_idx_15) (= v_v_8_1 (select c_main_a v_idx_15))) (<= (- (- v_b_1_1) (- v_b_6_1)) (- 2)) (<= (- (- v_b_4_1) (- c_main_x)) 0) (<= (- v_b_4_1 c_main_x) 0) (<= (- v_b_3_1 v_b_6_1) 1) (<= (- (- v_v_8_1) v_v_8_1) (- 2)) (<= (- v_b_3_1 c_main_x) 0) (<= (- (- v_b_6_1) (- c_main_y)) 0) (<= (- (- v_b_1_1) (- c_main_y)) (- 2)) (<= (- v_v_11_1 (- v_v_8_1)) 1000) (<= (- (- v_b_4_1) (- v_b_6_1)) (- 1)) (<= (- v_b_1_1 c_main_x) 1) (<= (- v_b_6_1 c_main_y) 0) (<= (- v_v_11_1 (- v_v_11_1)) 1998) (or (< v_idx_16 v_b_1_1) (= v_v_3_1 (select c_main_a v_idx_16))) (<= (- (- v_b_4_1) (- c_main_y)) (- 1)) (or (= v_v_4_1 (select c_main_a v_idx_12)) (<= v_b_6_1 v_idx_12)) (<= (- (- v_b_3_1) (- c_main_y)) (- 1)) (or (= v_v_6_1 (select c_main_a v_idx_14)) (<= v_b_4_1 v_idx_14) (< v_idx_14 v_b_3_1)) (<= (- (- v_v_11_1) v_v_11_1) (- 1998)) (or (< v_idx_13 v_b_6_1) (= (select c_main_a v_idx_13) v_v_11_1) (<= v_b_3_1 v_idx_13)) (<= (- (- v_b_1_1) (- v_b_3_1)) (- 1)) (<= (- v_b_3_1 v_b_4_1) 0) (<= (- (- v_b_1_1) (- c_main_x)) (- 1)) (<= (- (- c_main_x) (- c_main_y)) (- 1)))))} [2018-12-23 14:32:05,842 WARN L263 ngHoareTripleChecker]: unsat core / model generation is disabled, enable it to get more details [2018-12-23 14:32:05,937 WARN L268 ngHoareTripleChecker]: -- [2018-12-23 14:32:05,937 WARN L269 ngHoareTripleChecker]: Simplified triple