java -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_compound_exp_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 16:27:46,999 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 16:27:47,001 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 16:27:47,022 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 16:27:47,023 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 16:27:47,024 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 16:27:47,025 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 16:27:47,027 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 16:27:47,028 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 16:27:47,029 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 16:27:47,030 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 16:27:47,054 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_exp_cong.epf [2018-12-03 16:27:47,067 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 16:27:47,067 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 16:27:47,068 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 16:27:47,068 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 16:27:47,068 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 16:27:47,068 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 16:27:47,069 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 16:27:47,069 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 16:27:47,069 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-03 16:27:47,069 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 16:27:47,069 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-03 16:27:47,070 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 16:27:47,070 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 16:27:47,070 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 16:27:47,070 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 16:27:47,071 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 16:27:47,071 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 16:27:47,071 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 16:27:47,071 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 16:27:47,072 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 16:27:47,072 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 16:27:47,072 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 16:27:47,072 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 16:27:47,072 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 16:27:47,073 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 16:27:47,073 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 16:27:47,073 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 16:27:47,073 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 16:27:47,073 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 16:27:47,074 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 16:27:47,074 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 16:27:47,074 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 16:27:47,074 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 16:27:47,074 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 16:27:47,075 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 16:27:47,075 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 16:27:47,075 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 16:27:47,075 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 16:27:47,075 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 16:27:47,076 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 16:27:47,076 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 16:27:47,115 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 16:27:47,134 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 16:27:47,138 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 16:27:47,141 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 16:27:47,141 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 16:27:47,142 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_1.i_3.bpl [2018-12-03 16:27:47,143 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/count_by_1.i_3.bpl' [2018-12-03 16:27:47,187 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 16:27:47,189 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 16:27:47,190 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 16:27:47,190 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 16:27:47,191 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 16:27:47,209 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,219 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,229 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 16:27:47,230 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 16:27:47,230 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 16:27:47,231 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 16:27:47,243 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,243 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,244 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,244 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,251 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,251 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/1) ... [2018-12-03 16:27:47,253 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 16:27:47,254 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 16:27:47,254 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 16:27:47,254 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 16:27:47,256 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (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 [2018-12-03 16:27:47,319 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 16:27:47,319 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 16:27:47,517 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 16:27:47,518 INFO L280 CfgBuilder]: Removed 1 assue(true) statements. [2018-12-03 16:27:47,518 INFO L202 PluginConnector]: Adding new model count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:27:47 BoogieIcfgContainer [2018-12-03 16:27:47,518 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 16:27:47,519 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 16:27:47,520 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 16:27:47,523 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 16:27:47,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 04:27:47" (1/2) ... [2018-12-03 16:27:47,524 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31c5b70 and model type count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 04:27:47, skipping insertion in model container [2018-12-03 16:27:47,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 04:27:47" (2/2) ... [2018-12-03 16:27:47,526 INFO L112 eAbstractionObserver]: Analyzing ICFG count_by_1.i_3.bpl [2018-12-03 16:27:47,537 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 16:27:47,546 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 16:27:47,564 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 16:27:47,598 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 16:27:47,599 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 16:27:47,599 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 16:27:47,599 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 16:27:47,599 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 16:27:47,599 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 16:27:47,600 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 16:27:47,600 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 16:27:47,615 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 16:27:47,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 16:27:47,622 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:27:47,623 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 16:27:47,626 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:27:47,632 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:27:47,633 INFO L82 PathProgramCache]: Analyzing trace with hash 29955, now seen corresponding path program 1 times [2018-12-03 16:27:47,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:27:47,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:47,678 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:27:47,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:47,679 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:27:47,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:27:47,768 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:47,770 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 16:27:47,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 16:27:47,771 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:27:47,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 16:27:47,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 16:27:47,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 16:27:47,789 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 16:27:47,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:27:47,849 INFO L93 Difference]: Finished difference Result 9 states and 10 transitions. [2018-12-03 16:27:47,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 16:27:47,851 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 16:27:47,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:27:47,862 INFO L225 Difference]: With dead ends: 9 [2018-12-03 16:27:47,863 INFO L226 Difference]: Without dead ends: 5 [2018-12-03 16:27:47,867 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 16:27:47,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-12-03 16:27:47,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-12-03 16:27:47,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-12-03 16:27:47,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-12-03 16:27:47,904 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-12-03 16:27:47,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:27:47,905 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-12-03 16:27:47,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 16:27:47,905 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-12-03 16:27:47,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-12-03 16:27:47,905 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:27:47,906 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-12-03 16:27:47,906 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:27:47,906 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:27:47,906 INFO L82 PathProgramCache]: Analyzing trace with hash 930412, now seen corresponding path program 1 times [2018-12-03 16:27:47,907 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:27:47,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:47,908 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:27:47,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:47,908 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:27:47,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:27:48,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:48,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:48,007 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:27:48,008 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 5 with the following transitions: [2018-12-03 16:27:48,010 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9] [2018-12-03 16:27:48,090 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 16:27:48,094 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 16:27:48,279 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 16:27:48,280 INFO L272 AbstractInterpreter]: Visited 4 different actions 10 times. Merged at 1 different actions 3 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 16:27:48,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:27:48,309 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 16:27:48,309 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:48,310 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:27:48,327 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:27:48,328 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:27:48,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:27:48,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:27:48,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:48,371 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:27:48,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:48,472 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:27:48,472 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2018-12-03 16:27:48,472 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:27:48,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 16:27:48,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 16:27:48,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-03 16:27:48,474 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 4 states. [2018-12-03 16:27:48,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:27:48,504 INFO L93 Difference]: Finished difference Result 8 states and 8 transitions. [2018-12-03 16:27:48,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 16:27:48,505 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2018-12-03 16:27:48,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:27:48,506 INFO L225 Difference]: With dead ends: 8 [2018-12-03 16:27:48,506 INFO L226 Difference]: Without dead ends: 6 [2018-12-03 16:27:48,507 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-12-03 16:27:48,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-12-03 16:27:48,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-12-03 16:27:48,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-12-03 16:27:48,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-12-03 16:27:48,510 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-12-03 16:27:48,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:27:48,510 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-12-03 16:27:48,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 16:27:48,510 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-12-03 16:27:48,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 16:27:48,511 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:27:48,511 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2018-12-03 16:27:48,511 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:27:48,512 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:27:48,512 INFO L82 PathProgramCache]: Analyzing trace with hash 28844579, now seen corresponding path program 2 times [2018-12-03 16:27:48,512 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:27:48,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:48,513 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:27:48,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:48,514 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:27:48,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:27:48,608 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:48,608 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:48,609 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:27:48,609 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:27:48,609 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:27:48,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:48,609 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:27:48,622 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:27:48,623 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:27:48,634 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 16:27:48,634 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:27:48,636 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:27:48,640 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:48,640 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:27:48,731 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:48,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:27:48,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-12-03 16:27:48,750 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:27:48,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 16:27:48,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 16:27:48,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:27:48,751 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-12-03 16:27:48,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:27:48,776 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-12-03 16:27:48,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 16:27:48,778 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-12-03 16:27:48,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:27:48,779 INFO L225 Difference]: With dead ends: 9 [2018-12-03 16:27:48,779 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 16:27:48,779 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-12-03 16:27:48,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 16:27:48,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 16:27:48,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 16:27:48,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-12-03 16:27:48,783 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-12-03 16:27:48,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:27:48,783 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-12-03 16:27:48,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 16:27:48,783 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-12-03 16:27:48,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 16:27:48,784 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:27:48,784 INFO L402 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-12-03 16:27:48,784 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:27:48,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:27:48,785 INFO L82 PathProgramCache]: Analyzing trace with hash 894183756, now seen corresponding path program 3 times [2018-12-03 16:27:48,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:27:48,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:48,787 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:27:48,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:48,788 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:27:48,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:27:48,910 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:48,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:48,911 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:27:48,911 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:27:48,911 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:27:48,912 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:48,912 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:27:48,933 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 16:27:48,933 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 16:27:48,960 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 16:27:48,960 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:27:48,962 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:27:48,967 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:48,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:27:49,169 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:49,191 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:27:49,191 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-12-03 16:27:49,191 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:27:49,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-03 16:27:49,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-03 16:27:49,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:27:49,193 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-12-03 16:27:49,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:27:49,237 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-12-03 16:27:49,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 16:27:49,239 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-12-03 16:27:49,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:27:49,240 INFO L225 Difference]: With dead ends: 10 [2018-12-03 16:27:49,240 INFO L226 Difference]: Without dead ends: 8 [2018-12-03 16:27:49,241 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-12-03 16:27:49,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-12-03 16:27:49,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-12-03 16:27:49,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-12-03 16:27:49,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-12-03 16:27:49,245 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-12-03 16:27:49,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:27:49,246 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-12-03 16:27:49,246 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-03 16:27:49,246 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-12-03 16:27:49,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 16:27:49,247 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:27:49,247 INFO L402 BasicCegarLoop]: trace histogram [4, 1, 1, 1] [2018-12-03 16:27:49,247 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:27:49,248 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:27:49,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894467, now seen corresponding path program 4 times [2018-12-03 16:27:49,248 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:27:49,249 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:49,249 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 16:27:49,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:49,250 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:27:49,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:27:49,336 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:49,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:49,337 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:27:49,338 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:27:49,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:27:49,338 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:49,339 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:27:49,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:27:49,350 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 16:27:49,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:27:49,359 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:27:49,366 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:49,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:27:49,559 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:49,580 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 16:27:49,580 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2018-12-03 16:27:49,580 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 16:27:49,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 16:27:49,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 16:27:49,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-12-03 16:27:49,582 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-12-03 16:27:49,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:27:49,609 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-12-03 16:27:49,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 16:27:49,610 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-12-03 16:27:49,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:27:49,611 INFO L225 Difference]: With dead ends: 11 [2018-12-03 16:27:49,611 INFO L226 Difference]: Without dead ends: 9 [2018-12-03 16:27:49,612 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-12-03 16:27:49,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-12-03 16:27:49,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-12-03 16:27:49,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 16:27:49,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-12-03 16:27:49,615 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-12-03 16:27:49,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:27:49,615 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-12-03 16:27:49,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 16:27:49,615 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-12-03 16:27:49,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 16:27:49,616 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 16:27:49,616 INFO L402 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-12-03 16:27:49,616 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 16:27:49,617 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 16:27:49,617 INFO L82 PathProgramCache]: Analyzing trace with hash 317188140, now seen corresponding path program 5 times [2018-12-03 16:27:49,617 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 16:27:49,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:49,618 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 16:27:49,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 16:27:49,619 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 16:27:49,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 16:27:49,713 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 16:27:49,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:49,714 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 16:27:49,715 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 16:27:49,715 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 16:27:49,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 16:27:49,715 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 16:27:49,724 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 16:27:49,724 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 16:27:49,738 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 16:27:49,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 16:27:49,740 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 16:27:49,809 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-03 16:27:49,809 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 16:27:49,998 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-12-03 16:27:50,031 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-12-03 16:27:50,031 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7] total 9 [2018-12-03 16:27:50,032 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 16:27:50,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 16:27:50,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 16:27:50,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:27:50,033 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 3 states. [2018-12-03 16:27:50,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 16:27:50,064 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-12-03 16:27:50,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 16:27:50,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2018-12-03 16:27:50,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 16:27:50,068 INFO L225 Difference]: With dead ends: 9 [2018-12-03 16:27:50,068 INFO L226 Difference]: Without dead ends: 0 [2018-12-03 16:27:50,069 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-12-03 16:27:50,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-12-03 16:27:50,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-12-03 16:27:50,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-12-03 16:27:50,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-12-03 16:27:50,070 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 8 [2018-12-03 16:27:50,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 16:27:50,070 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-12-03 16:27:50,070 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 16:27:50,072 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-12-03 16:27:50,072 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-12-03 16:27:50,079 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-12-03 16:27:50,141 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(lines 1 35) no Hoare annotation was computed. [2018-12-03 16:27:50,141 INFO L444 ceAbstractionStarter]: At program point L32(lines 13 32) the Hoare annotation is: (<= ULTIMATE.start_main_~i~4 1000000) [2018-12-03 16:27:50,141 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONASSERT(line 34) no Hoare annotation was computed. [2018-12-03 16:27:50,141 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startENTRY(lines 1 35) no Hoare annotation was computed. [2018-12-03 16:27:50,141 INFO L448 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(lines 1 35) no Hoare annotation was computed. [2018-12-03 16:27:50,142 INFO L444 ceAbstractionStarter]: At program point L26(lines 26 33) the Hoare annotation is: false [2018-12-03 16:27:50,150 INFO L202 PluginConnector]: Adding new model count_by_1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 04:27:50 BoogieIcfgContainer [2018-12-03 16:27:50,150 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-03 16:27:50,151 INFO L168 Benchmark]: Toolchain (without parser) took 2962.91 ms. Allocated memory is still 1.5 GB. Free memory was 1.5 GB in the beginning and 1.3 GB in the end (delta: 171.8 MB). Peak memory consumption was 171.8 MB. Max. memory is 7.1 GB. [2018-12-03 16:27:50,153 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.21 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. [2018-12-03 16:27:50,154 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.74 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. [2018-12-03 16:27:50,154 INFO L168 Benchmark]: Boogie Preprocessor took 22.90 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. [2018-12-03 16:27:50,155 INFO L168 Benchmark]: RCFGBuilder took 264.62 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: 21.1 MB). Peak memory consumption was 21.1 MB. Max. memory is 7.1 GB. [2018-12-03 16:27:50,156 INFO L168 Benchmark]: TraceAbstraction took 2630.82 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.3 GB in the end (delta: 150.7 MB). Peak memory consumption was 150.7 MB. Max. memory is 7.1 GB. [2018-12-03 16:27:50,160 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 0.21 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 Procedure Inliner took 39.74 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 22.90 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 264.62 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: 21.1 MB). Peak memory consumption was 21.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2630.82 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.3 GB in the end (delta: 150.7 MB). Peak memory consumption was 150.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 34]: 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 - InvariantResult [Line: 26]: Loop Invariant Derived loop invariant: false - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: main_~i~4 <= 1000000 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 6 locations, 1 error locations. SAFE Result, 2.5s OverallTime, 6 OverallIterations, 5 TraceHistogramMax, 0.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 16 SDtfs, 0 SDslu, 12 SDs, 0 SdLazy, 33 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 77 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=9occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.3s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 2 LocationsWithAnnotation, 2 PreInvPairs, 7 NumberOfFragments, 4 HoareAnnotationTreeSize, 2 FomulaSimplifications, 36 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 2 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 63 NumberOfCodeBlocks, 60 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 77 ConstructedInterpolants, 0 QuantifiedInterpolants, 933 SizeOfPredicates, 8 NumberOfNonLiveVariables, 96 ConjunctsInSsa, 27 ConjunctsInUnsatCore, 16 InterpolantComputations, 3 PerfectInterpolantSequences, 30/105 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...