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_compound_exp_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/string.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-1de736e-m [2019-02-15 10:44:53,372 INFO L170 SettingsManager]: Resetting all preferences to default values... [2019-02-15 10:44:53,374 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2019-02-15 10:44:53,385 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-02-15 10:44:53,385 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-02-15 10:44:53,386 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-02-15 10:44:53,388 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-02-15 10:44:53,390 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2019-02-15 10:44:53,391 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-02-15 10:44:53,392 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-02-15 10:44:53,393 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-02-15 10:44:53,418 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_compound_exp_cong.epf [2019-02-15 10:44:53,430 INFO L110 SettingsManager]: Loading preferences was successful [2019-02-15 10:44:53,431 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2019-02-15 10:44:53,432 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2019-02-15 10:44:53,432 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2019-02-15 10:44:53,432 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-02-15 10:44:53,432 INFO L133 SettingsManager]: * User list type=DISABLED [2019-02-15 10:44:53,432 INFO L133 SettingsManager]: * Inline calls to unimplemented procedures=true [2019-02-15 10:44:53,433 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-02-15 10:44:53,433 INFO L133 SettingsManager]: * Explicit value domain=true [2019-02-15 10:44:53,433 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-02-15 10:44:53,433 INFO L133 SettingsManager]: * Octagon Domain=false [2019-02-15 10:44:53,433 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2019-02-15 10:44:53,434 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-02-15 10:44:53,434 INFO L133 SettingsManager]: * Interval Domain=false [2019-02-15 10:44:53,434 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-02-15 10:44:53,435 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2019-02-15 10:44:53,435 INFO L133 SettingsManager]: * Use SBE=true [2019-02-15 10:44:53,435 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-02-15 10:44:53,435 INFO L133 SettingsManager]: * sizeof long=4 [2019-02-15 10:44:53,436 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2019-02-15 10:44:53,436 INFO L133 SettingsManager]: * sizeof POINTER=4 [2019-02-15 10:44:53,436 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2019-02-15 10:44:53,436 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-02-15 10:44:53,436 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-02-15 10:44:53,436 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-02-15 10:44:53,437 INFO L133 SettingsManager]: * sizeof long double=12 [2019-02-15 10:44:53,437 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2019-02-15 10:44:53,437 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-02-15 10:44:53,437 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-02-15 10:44:53,437 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-02-15 10:44:53,438 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2019-02-15 10:44:53,438 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-02-15 10:44:53,438 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-02-15 10:44:53,438 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-02-15 10:44:53,438 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-02-15 10:44:53,439 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-02-15 10:44:53,439 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-02-15 10:44:53,439 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-02-15 10:44:53,439 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-02-15 10:44:53,439 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-02-15 10:44:53,468 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-02-15 10:44:53,480 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-02-15 10:44:53,484 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-02-15 10:44:53,485 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2019-02-15 10:44:53,486 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2019-02-15 10:44:53,486 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/string.i_3.bpl [2019-02-15 10:44:53,487 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/string.i_3.bpl' [2019-02-15 10:44:53,529 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-02-15 10:44:53,531 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-02-15 10:44:53,532 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-02-15 10:44:53,532 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-02-15 10:44:53,532 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2019-02-15 10:44:53,549 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,561 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,569 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-02-15 10:44:53,570 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-02-15 10:44:53,570 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-02-15 10:44:53,571 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2019-02-15 10:44:53,582 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,582 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,583 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,584 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,588 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,590 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,591 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/1) ... [2019-02-15 10:44:53,593 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-02-15 10:44:53,594 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-02-15 10:44:53,594 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-02-15 10:44:53,594 INFO L276 PluginConnector]: RCFGBuilder initialized [2019-02-15 10:44:53,595 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (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 [2019-02-15 10:44:53,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-02-15 10:44:53,661 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-02-15 10:44:53,919 INFO L281 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-02-15 10:44:53,919 INFO L286 CfgBuilder]: Removed 5 assue(true) statements. [2019-02-15 10:44:53,921 INFO L202 PluginConnector]: Adding new model string.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 10:44:53 BoogieIcfgContainer [2019-02-15 10:44:53,921 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-02-15 10:44:53,922 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-02-15 10:44:53,922 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-02-15 10:44:53,925 INFO L276 PluginConnector]: TraceAbstraction initialized [2019-02-15 10:44:53,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 15.02 10:44:53" (1/2) ... [2019-02-15 10:44:53,926 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15a12f3d and model type string.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 10:44:53, skipping insertion in model container [2019-02-15 10:44:53,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "string.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 10:44:53" (2/2) ... [2019-02-15 10:44:53,928 INFO L112 eAbstractionObserver]: Analyzing ICFG string.i_3.bpl [2019-02-15 10:44:53,938 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-02-15 10:44:53,945 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-02-15 10:44:53,962 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-02-15 10:44:53,995 INFO L382 AbstractCegarLoop]: Interprodecural is true [2019-02-15 10:44:53,996 INFO L383 AbstractCegarLoop]: Hoare is true [2019-02-15 10:44:53,996 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-02-15 10:44:53,996 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-02-15 10:44:53,996 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-02-15 10:44:53,997 INFO L387 AbstractCegarLoop]: Difference is false [2019-02-15 10:44:53,997 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-02-15 10:44:53,997 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-02-15 10:44:54,011 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2019-02-15 10:44:54,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2019-02-15 10:44:54,017 INFO L394 BasicCegarLoop]: Found error trace [2019-02-15 10:44:54,018 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2019-02-15 10:44:54,021 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-15 10:44:54,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-15 10:44:54,027 INFO L82 PathProgramCache]: Analyzing trace with hash 928714, now seen corresponding path program 1 times [2019-02-15 10:44:54,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-15 10:44:54,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:54,077 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-15 10:44:54,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:54,077 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-15 10:44:54,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-15 10:44:54,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-02-15 10:44:54,168 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-02-15 10:44:54,169 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-02-15 10:44:54,169 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-02-15 10:44:54,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-02-15 10:44:54,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-02-15 10:44:54,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-02-15 10:44:54,193 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2019-02-15 10:44:54,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-15 10:44:54,337 INFO L93 Difference]: Finished difference Result 12 states and 16 transitions. [2019-02-15 10:44:54,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-02-15 10:44:54,339 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2019-02-15 10:44:54,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-15 10:44:54,351 INFO L225 Difference]: With dead ends: 12 [2019-02-15 10:44:54,351 INFO L226 Difference]: Without dead ends: 7 [2019-02-15 10:44:54,355 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 [2019-02-15 10:44:54,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2019-02-15 10:44:54,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2019-02-15 10:44:54,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2019-02-15 10:44:54,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2019-02-15 10:44:54,388 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2019-02-15 10:44:54,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-15 10:44:54,388 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2019-02-15 10:44:54,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-02-15 10:44:54,389 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2019-02-15 10:44:54,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-02-15 10:44:54,389 INFO L394 BasicCegarLoop]: Found error trace [2019-02-15 10:44:54,390 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-02-15 10:44:54,390 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-15 10:44:54,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-15 10:44:54,391 INFO L82 PathProgramCache]: Analyzing trace with hash 894131125, now seen corresponding path program 1 times [2019-02-15 10:44:54,391 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-15 10:44:54,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:54,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-15 10:44:54,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:54,393 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-15 10:44:54,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-15 10:44:54,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-02-15 10:44:54,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-15 10:44:54,525 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-15 10:44:54,526 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2019-02-15 10:44:54,528 INFO L207 CegarAbsIntRunner]: [0], [5], [7], [12], [14], [16] [2019-02-15 10:44:54,568 INFO L148 AbstractInterpreter]: Using domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2019-02-15 10:44:54,568 INFO L101 FixpointEngine]: Starting fixpoint engine with domain CompoundDomain (maxUnwinding=3, maxParallelStates=2) [2019-02-15 10:44:54,739 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-02-15 10:44:54,743 INFO L272 AbstractInterpreter]: Visited 6 different actions 18 times. Merged at 2 different actions 6 times. Never widened. Performed 206 root evaluator evaluations with a maximum evaluation depth of 5. Performed 206 inverse root evaluator evaluations with a maximum inverse evaluation depth of 5. Found 4 fixpoints after 4 different actions. Largest state had 0 variables. [2019-02-15 10:44:54,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-15 10:44:54,749 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-02-15 10:44:54,749 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-15 10:44:54,750 INFO L193 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 [2019-02-15 10:44:54,779 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-15 10:44:54,780 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-15 10:44:54,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-15 10:44:54,820 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-15 10:44:54,835 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-02-15 10:44:54,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-15 10:44:54,881 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-02-15 10:44:54,901 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-15 10:44:54,901 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2019-02-15 10:44:54,901 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-15 10:44:54,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-02-15 10:44:54,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-02-15 10:44:54,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-02-15 10:44:54,903 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 4 states. [2019-02-15 10:44:54,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-15 10:44:54,947 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2019-02-15 10:44:54,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-02-15 10:44:54,948 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2019-02-15 10:44:54,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-15 10:44:54,949 INFO L225 Difference]: With dead ends: 13 [2019-02-15 10:44:54,949 INFO L226 Difference]: Without dead ends: 9 [2019-02-15 10:44:54,950 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-02-15 10:44:54,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2019-02-15 10:44:54,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2019-02-15 10:44:54,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2019-02-15 10:44:54,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2019-02-15 10:44:54,953 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2019-02-15 10:44:54,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-15 10:44:54,953 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2019-02-15 10:44:54,953 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-02-15 10:44:54,953 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2019-02-15 10:44:54,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-02-15 10:44:54,954 INFO L394 BasicCegarLoop]: Found error trace [2019-02-15 10:44:54,954 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1] [2019-02-15 10:44:54,954 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-15 10:44:54,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-15 10:44:54,955 INFO L82 PathProgramCache]: Analyzing trace with hash 315556586, now seen corresponding path program 2 times [2019-02-15 10:44:54,955 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-15 10:44:54,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:54,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-15 10:44:54,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:54,956 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-15 10:44:54,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-15 10:44:55,032 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-02-15 10:44:55,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-15 10:44:55,033 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-15 10:44:55,033 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-15 10:44:55,033 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-15 10:44:55,034 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-15 10:44:55,034 INFO L193 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 [2019-02-15 10:44:55,051 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-02-15 10:44:55,051 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-02-15 10:44:55,098 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-02-15 10:44:55,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-15 10:44:55,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-15 10:44:55,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-02-15 10:44:55,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-15 10:44:55,280 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-02-15 10:44:55,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-15 10:44:55,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2019-02-15 10:44:55,309 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-15 10:44:55,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-02-15 10:44:55,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-02-15 10:44:55,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-02-15 10:44:55,311 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 5 states. [2019-02-15 10:44:55,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-15 10:44:55,501 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2019-02-15 10:44:55,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-02-15 10:44:55,501 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2019-02-15 10:44:55,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-15 10:44:55,502 INFO L225 Difference]: With dead ends: 16 [2019-02-15 10:44:55,502 INFO L226 Difference]: Without dead ends: 11 [2019-02-15 10:44:55,503 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-02-15 10:44:55,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2019-02-15 10:44:55,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2019-02-15 10:44:55,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2019-02-15 10:44:55,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2019-02-15 10:44:55,506 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2019-02-15 10:44:55,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-15 10:44:55,506 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2019-02-15 10:44:55,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-02-15 10:44:55,506 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2019-02-15 10:44:55,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-02-15 10:44:55,506 INFO L394 BasicCegarLoop]: Found error trace [2019-02-15 10:44:55,507 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1] [2019-02-15 10:44:55,507 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-15 10:44:55,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-15 10:44:55,507 INFO L82 PathProgramCache]: Analyzing trace with hash -175395819, now seen corresponding path program 3 times [2019-02-15 10:44:55,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-15 10:44:55,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:55,510 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-15 10:44:55,510 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:55,510 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-15 10:44:55,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-15 10:44:55,696 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-02-15 10:44:55,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-15 10:44:55,697 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-15 10:44:55,697 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-15 10:44:55,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-15 10:44:55,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-15 10:44:55,697 INFO L193 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 [2019-02-15 10:44:55,708 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-02-15 10:44:55,708 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2019-02-15 10:44:55,732 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-02-15 10:44:55,733 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-02-15 10:44:55,734 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-15 10:44:55,739 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-02-15 10:44:55,740 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-15 10:44:55,802 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-02-15 10:44:55,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-15 10:44:55,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2019-02-15 10:44:55,820 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-15 10:44:55,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-02-15 10:44:55,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-02-15 10:44:55,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-02-15 10:44:55,822 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 6 states. [2019-02-15 10:44:55,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-15 10:44:55,853 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2019-02-15 10:44:55,854 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-02-15 10:44:55,854 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2019-02-15 10:44:55,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-15 10:44:55,854 INFO L225 Difference]: With dead ends: 19 [2019-02-15 10:44:55,855 INFO L226 Difference]: Without dead ends: 13 [2019-02-15 10:44:55,855 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-02-15 10:44:55,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-02-15 10:44:55,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-02-15 10:44:55,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-02-15 10:44:55,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-02-15 10:44:55,859 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2019-02-15 10:44:55,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-15 10:44:55,860 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-02-15 10:44:55,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-02-15 10:44:55,860 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-02-15 10:44:55,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-02-15 10:44:55,861 INFO L394 BasicCegarLoop]: Found error trace [2019-02-15 10:44:55,861 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1] [2019-02-15 10:44:55,862 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-15 10:44:55,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-15 10:44:55,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1258544630, now seen corresponding path program 4 times [2019-02-15 10:44:55,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-15 10:44:55,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:55,864 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-02-15 10:44:55,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:55,864 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-15 10:44:55,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-15 10:44:55,972 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-02-15 10:44:55,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-15 10:44:55,973 INFO L193 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2019-02-15 10:44:55,973 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-02-15 10:44:55,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-02-15 10:44:55,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-02-15 10:44:55,974 INFO L193 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 [2019-02-15 10:44:55,983 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-15 10:44:55,984 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-02-15 10:44:56,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-02-15 10:44:56,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2019-02-15 10:44:56,015 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-02-15 10:44:56,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2019-02-15 10:44:56,080 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-02-15 10:44:56,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-02-15 10:44:56,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2019-02-15 10:44:56,101 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-02-15 10:44:56,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-02-15 10:44:56,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-02-15 10:44:56,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-02-15 10:44:56,102 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 7 states. [2019-02-15 10:44:56,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-02-15 10:44:56,209 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-02-15 10:44:56,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-02-15 10:44:56,211 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2019-02-15 10:44:56,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-02-15 10:44:56,211 INFO L225 Difference]: With dead ends: 22 [2019-02-15 10:44:56,211 INFO L226 Difference]: Without dead ends: 15 [2019-02-15 10:44:56,212 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 5 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-02-15 10:44:56,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-02-15 10:44:56,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-02-15 10:44:56,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-02-15 10:44:56,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2019-02-15 10:44:56,219 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2019-02-15 10:44:56,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-02-15 10:44:56,220 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2019-02-15 10:44:56,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-02-15 10:44:56,220 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2019-02-15 10:44:56,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-02-15 10:44:56,220 INFO L394 BasicCegarLoop]: Found error trace [2019-02-15 10:44:56,221 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1] [2019-02-15 10:44:56,221 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2019-02-15 10:44:56,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-02-15 10:44:56,221 INFO L82 PathProgramCache]: Analyzing trace with hash -400886667, now seen corresponding path program 5 times [2019-02-15 10:44:56,221 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-02-15 10:44:56,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:56,222 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-02-15 10:44:56,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-02-15 10:44:56,223 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-02-15 10:44:56,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-02-15 10:44:56,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-02-15 10:44:56,420 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2019-02-15 10:44:56,439 INFO L202 PluginConnector]: Adding new model string.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.02 10:44:56 BoogieIcfgContainer [2019-02-15 10:44:56,439 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-02-15 10:44:56,440 INFO L168 Benchmark]: Toolchain (without parser) took 2910.30 ms. Allocated memory was 141.6 MB in the beginning and 224.4 MB in the end (delta: 82.8 MB). Free memory was 106.5 MB in the beginning and 208.7 MB in the end (delta: -102.2 MB). Peak memory consumption was 67.7 MB. Max. memory is 7.1 GB. [2019-02-15 10:44:56,442 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.17 ms. Allocated memory is still 141.6 MB. Free memory is still 107.9 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-02-15 10:44:56,443 INFO L168 Benchmark]: Boogie Procedure Inliner took 38.10 ms. Allocated memory is still 141.6 MB. Free memory was 106.3 MB in the beginning and 104.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. [2019-02-15 10:44:56,444 INFO L168 Benchmark]: Boogie Preprocessor took 23.09 ms. Allocated memory is still 141.6 MB. Free memory was 104.6 MB in the beginning and 103.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.1 MB. Max. memory is 7.1 GB. [2019-02-15 10:44:56,445 INFO L168 Benchmark]: RCFGBuilder took 327.15 ms. Allocated memory is still 141.6 MB. Free memory was 103.5 MB in the beginning and 93.5 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2019-02-15 10:44:56,446 INFO L168 Benchmark]: TraceAbstraction took 2517.60 ms. Allocated memory was 141.6 MB in the beginning and 224.4 MB in the end (delta: 82.8 MB). Free memory was 93.3 MB in the beginning and 208.7 MB in the end (delta: -115.4 MB). Peak memory consumption was 54.5 MB. Max. memory is 7.1 GB. [2019-02-15 10:44:56,451 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 0.17 ms. Allocated memory is still 141.6 MB. Free memory is still 107.9 MB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 38.10 ms. Allocated memory is still 141.6 MB. Free memory was 106.3 MB in the beginning and 104.6 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.09 ms. Allocated memory is still 141.6 MB. Free memory was 104.6 MB in the beginning and 103.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 327.15 ms. Allocated memory is still 141.6 MB. Free memory was 103.5 MB in the beginning and 93.5 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2517.60 ms. Allocated memory was 141.6 MB in the beginning and 224.4 MB in the end (delta: 82.8 MB). Free memory was 93.3 MB in the beginning and 208.7 MB in the end (delta: -115.4 MB). Peak memory consumption was 54.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 89]: Unable to prove that assertion always holds Unable to prove that assertion always holds Reason: overapproximation of shiftLeft at line 72. Possible FailurePath: [L23] havoc main_#res; [L24] havoc main_#t~nondet1, main_#t~post0, main_#t~nondet3, main_#t~post2, main_#t~post4, main_#t~post5, main_#t~post6, main_#t~post7, main_~string_A~5, main_~string_B~5, main_~i~5, main_~j~5, main_~nc_A~5, main_~nc_B~5, main_~found~5; [L25] havoc main_~string_A~5; [L26] havoc main_~string_B~5; [L27] havoc main_~i~5; [L28] havoc main_~j~5; [L29] havoc main_~nc_A~5; [L30] havoc main_~nc_B~5; [L31] main_~found~5 := 0; [L32] main_~i~5 := 0; VAL [main_~found~5=0, main_~i~5=0] [L45] assume !!(main_~i~5 < 5); [L46] assume -128 <= main_#t~nondet1 && main_#t~nondet1 <= 127; [L47] main_~string_A~5 := main_~string_A~5[main_~i~5 := main_#t~nondet1]; [L48] havoc main_#t~nondet1; [L49] main_#t~post0 := main_~i~5; [L50] main_~i~5 := main_#t~post0 + 1; [L51] havoc main_#t~post0; VAL [main_~found~5=0, main_~i~5=1] [L45] assume !!(main_~i~5 < 5); [L46] assume -128 <= main_#t~nondet1 && main_#t~nondet1 <= 127; [L47] main_~string_A~5 := main_~string_A~5[main_~i~5 := main_#t~nondet1]; [L48] havoc main_#t~nondet1; [L49] main_#t~post0 := main_~i~5; [L50] main_~i~5 := main_#t~post0 + 1; [L51] havoc main_#t~post0; VAL [main_~found~5=0, main_~i~5=2] [L45] assume !!(main_~i~5 < 5); [L46] assume -128 <= main_#t~nondet1 && main_#t~nondet1 <= 127; [L47] main_~string_A~5 := main_~string_A~5[main_~i~5 := main_#t~nondet1]; [L48] havoc main_#t~nondet1; [L49] main_#t~post0 := main_~i~5; [L50] main_~i~5 := main_#t~post0 + 1; [L51] havoc main_#t~post0; VAL [main_~found~5=0, main_~i~5=3] [L45] assume !!(main_~i~5 < 5); [L46] assume -128 <= main_#t~nondet1 && main_#t~nondet1 <= 127; [L47] main_~string_A~5 := main_~string_A~5[main_~i~5 := main_#t~nondet1]; [L48] havoc main_#t~nondet1; [L49] main_#t~post0 := main_~i~5; [L50] main_~i~5 := main_#t~post0 + 1; [L51] havoc main_#t~post0; VAL [main_~found~5=0, main_~i~5=4] [L45] assume !!(main_~i~5 < 5); [L46] assume -128 <= main_#t~nondet1 && main_#t~nondet1 <= 127; [L47] main_~string_A~5 := main_~string_A~5[main_~i~5 := main_#t~nondet1]; [L48] havoc main_#t~nondet1; [L49] main_#t~post0 := main_~i~5; [L50] main_~i~5 := main_#t~post0 + 1; [L51] havoc main_#t~post0; VAL [main_~found~5=0, main_~i~5=5] [L40] assume !(main_~i~5 < 5); [L41] assume !!(main_~string_A~5[4] == 0); [L42] main_~i~5 := 0; VAL [main_~found~5=0, main_~i~5=0] [L80] assume !!(main_~i~5 < 5); [L81] assume -128 <= main_#t~nondet3 && main_#t~nondet3 <= 127; [L82] main_~string_B~5 := main_~string_B~5[main_~i~5 := main_#t~nondet3]; [L83] havoc main_#t~nondet3; [L84] main_#t~post2 := main_~i~5; [L85] main_~i~5 := main_#t~post2 + 1; [L86] havoc main_#t~post2; VAL [main_~found~5=0, main_~i~5=1] [L80] assume !!(main_~i~5 < 5); [L81] assume -128 <= main_#t~nondet3 && main_#t~nondet3 <= 127; [L82] main_~string_B~5 := main_~string_B~5[main_~i~5 := main_#t~nondet3]; [L83] havoc main_#t~nondet3; [L84] main_#t~post2 := main_~i~5; [L85] main_~i~5 := main_#t~post2 + 1; [L86] havoc main_#t~post2; VAL [main_~found~5=0, main_~i~5=2] [L80] assume !!(main_~i~5 < 5); [L81] assume -128 <= main_#t~nondet3 && main_#t~nondet3 <= 127; [L82] main_~string_B~5 := main_~string_B~5[main_~i~5 := main_#t~nondet3]; [L83] havoc main_#t~nondet3; [L84] main_#t~post2 := main_~i~5; [L85] main_~i~5 := main_#t~post2 + 1; [L86] havoc main_#t~post2; VAL [main_~found~5=0, main_~i~5=3] [L80] assume !!(main_~i~5 < 5); [L81] assume -128 <= main_#t~nondet3 && main_#t~nondet3 <= 127; [L82] main_~string_B~5 := main_~string_B~5[main_~i~5 := main_#t~nondet3]; [L83] havoc main_#t~nondet3; [L84] main_#t~post2 := main_~i~5; [L85] main_~i~5 := main_#t~post2 + 1; [L86] havoc main_#t~post2; VAL [main_~found~5=0, main_~i~5=4] [L80] assume !!(main_~i~5 < 5); [L81] assume -128 <= main_#t~nondet3 && main_#t~nondet3 <= 127; [L82] main_~string_B~5 := main_~string_B~5[main_~i~5 := main_#t~nondet3]; [L83] havoc main_#t~nondet3; [L84] main_#t~post2 := main_~i~5; [L85] main_~i~5 := main_#t~post2 + 1; [L86] havoc main_#t~post2; VAL [main_~found~5=0, main_~i~5=5] [L59] assume !(main_~i~5 < 5); [L60] assume !!(main_~string_B~5[4] == 0); [L61] main_~nc_A~5 := 0; [L63] assume !(main_~string_A~5[main_~nc_A~5] != 0); [L64] main_~nc_B~5 := 0; [L66] assume !(main_~string_B~5[main_~nc_B~5] != 0); [L67] assume !!(main_~nc_B~5 >= main_~nc_A~5); [L68] main_~j~5 := 0; [L69] main_~i~5 := main_~j~5; [L71] assume !(main_~i~5 < main_~nc_A~5 && main_~j~5 < main_~nc_B~5); [L72] main_~found~5 := ~shiftLeft((if main_~j~5 > main_~nc_B~5 - 1 then 1 else 0), main_~i~5); [L73] __VERIFIER_assert_#in~cond := (if main_~found~5 == 0 || main_~found~5 == 1 then 1 else 0); [L74] havoc __VERIFIER_assert_~cond; [L75] __VERIFIER_assert_~cond := __VERIFIER_assert_#in~cond; [L76] assume __VERIFIER_assert_~cond == 0; [L77] assume !false; VAL [__VERIFIER_assert_#in~cond=0, __VERIFIER_assert_~cond=0, main_~found~5=5, main_~i~5=0, main_~j~5=0, main_~nc_A~5=0, main_~nc_B~5=0] [L89] assert false; VAL [__VERIFIER_assert_#in~cond=0, __VERIFIER_assert_~cond=0, main_~found~5=5, main_~i~5=0, main_~j~5=0, main_~nc_A~5=0, main_~nc_B~5=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. UNSAFE Result, 2.4s OverallTime, 6 OverallIterations, 5 TraceHistogramMax, 0.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 20 SDtfs, 5 SDslu, 0 SDs, 0 SdLazy, 40 SolverSat, 29 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 84 GetRequests, 55 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=15occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 90 NumberOfCodeBlocks, 90 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 99 ConstructedInterpolants, 0 QuantifiedInterpolants, 1575 SizeOfPredicates, 0 NumberOfNonLiveVariables, 260 ConjunctsInSsa, 18 ConjunctsInUnsatCore, 13 InterpolantComputations, 1 PerfectInterpolantSequences, 60/120 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...