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_oct.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 19:08:34,074 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 19:08:34,076 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 19:08:34,095 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 19:08:34,096 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 19:08:34,097 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 19:08:34,098 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 19:08:34,101 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 19:08:34,104 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 19:08:34,104 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 19:08:34,106 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 19:08:34,159 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_oct.epf [2018-12-03 19:08:34,181 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 19:08:34,181 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 19:08:34,183 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 19:08:34,183 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 19:08:34,183 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 19:08:34,183 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 19:08:34,184 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 19:08:34,184 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 19:08:34,184 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 19:08:34,184 INFO L133 SettingsManager]: * Underlying domain=OctagonDomain [2018-12-03 19:08:34,184 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 19:08:34,185 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 19:08:34,185 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 19:08:34,185 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 19:08:34,186 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 19:08:34,186 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 19:08:34,187 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 19:08:34,187 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 19:08:34,187 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 19:08:34,187 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 19:08:34,187 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 19:08:34,187 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 19:08:34,190 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 19:08:34,190 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 19:08:34,190 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 19:08:34,190 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 19:08:34,190 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 19:08:34,191 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 19:08:34,191 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 19:08:34,191 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 19:08:34,191 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 19:08:34,191 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 19:08:34,192 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 19:08:34,192 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 19:08:34,192 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 19:08:34,192 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 19:08:34,192 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 19:08:34,192 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 19:08:34,193 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 19:08:34,193 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 19:08:34,228 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 19:08:34,242 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 19:08:34,251 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 19:08:34,253 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 19:08:34,254 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 19:08:34,255 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl [2018-12-03 19:08:34,255 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl' [2018-12-03 19:08:34,306 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 19:08:34,308 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 19:08:34,309 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 19:08:34,309 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 19:08:34,309 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 19:08:34,328 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,338 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,348 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 19:08:34,349 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 19:08:34,349 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 19:08:34,349 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 19:08:34,362 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,362 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,363 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,363 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,367 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,368 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,369 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/1) ... [2018-12-03 19:08:34,370 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 19:08:34,371 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 19:08:34,371 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 19:08:34,371 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 19:08:34,372 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (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 19:08:34,448 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 19:08:34,448 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 19:08:34,698 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 19:08:34,699 INFO L280 CfgBuilder]: Removed 2 assue(true) statements. [2018-12-03 19:08:34,699 INFO L202 PluginConnector]: Adding new model nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:08:34 BoogieIcfgContainer [2018-12-03 19:08:34,700 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 19:08:34,701 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 19:08:34,701 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 19:08:34,704 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 19:08:34,705 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 07:08:34" (1/2) ... [2018-12-03 19:08:34,706 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fecd764 and model type nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 07:08:34, skipping insertion in model container [2018-12-03 19:08:34,706 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 07:08:34" (2/2) ... [2018-12-03 19:08:34,708 INFO L112 eAbstractionObserver]: Analyzing ICFG nested1.i_4.bpl [2018-12-03 19:08:34,719 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 19:08:34,727 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 19:08:34,746 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 19:08:34,779 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 19:08:34,779 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 19:08:34,779 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 19:08:34,779 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 19:08:34,779 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 19:08:34,780 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 19:08:34,780 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 19:08:34,780 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 19:08:34,796 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states. [2018-12-03 19:08:34,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 19:08:34,802 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:34,803 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 19:08:34,806 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:34,812 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:34,812 INFO L82 PathProgramCache]: Analyzing trace with hash 29955, now seen corresponding path program 1 times [2018-12-03 19:08:34,814 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:34,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:34,867 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:34,868 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:34,868 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:34,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:35,157 WARN L180 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 9 [2018-12-03 19:08:35,159 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 19:08:35,162 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:08:35,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 19:08:35,163 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:08:35,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 19:08:35,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 19:08:35,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 19:08:35,187 INFO L87 Difference]: Start difference. First operand 5 states. Second operand 3 states. [2018-12-03 19:08:35,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:35,261 INFO L93 Difference]: Finished difference Result 11 states and 17 transitions. [2018-12-03 19:08:35,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 19:08:35,264 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 19:08:35,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:35,274 INFO L225 Difference]: With dead ends: 11 [2018-12-03 19:08:35,275 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 19:08:35,278 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 19:08:35,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 19:08:35,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 6. [2018-12-03 19:08:35,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-12-03 19:08:35,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 7 transitions. [2018-12-03 19:08:35,317 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 7 transitions. Word has length 3 [2018-12-03 19:08:35,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:35,318 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 7 transitions. [2018-12-03 19:08:35,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 19:08:35,318 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 7 transitions. [2018-12-03 19:08:35,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 19:08:35,319 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:35,319 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 19:08:35,319 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:35,320 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:35,320 INFO L82 PathProgramCache]: Analyzing trace with hash 28852267, now seen corresponding path program 1 times [2018-12-03 19:08:35,320 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:35,321 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:35,322 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:35,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:35,322 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:35,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:35,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:35,453 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 19:08:35,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 19:08:35,454 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 19:08:35,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 19:08:35,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 19:08:35,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 19:08:35,457 INFO L87 Difference]: Start difference. First operand 6 states and 7 transitions. Second operand 3 states. [2018-12-03 19:08:35,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:35,505 INFO L93 Difference]: Finished difference Result 11 states and 14 transitions. [2018-12-03 19:08:35,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 19:08:35,507 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2018-12-03 19:08:35,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:35,508 INFO L225 Difference]: With dead ends: 11 [2018-12-03 19:08:35,509 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 19:08:35,512 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 19:08:35,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 19:08:35,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 19:08:35,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 19:08:35,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2018-12-03 19:08:35,518 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2018-12-03 19:08:35,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:35,519 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2018-12-03 19:08:35,519 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 19:08:35,519 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2018-12-03 19:08:35,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 19:08:35,519 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:35,520 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 19:08:35,520 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:35,520 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:35,520 INFO L82 PathProgramCache]: Analyzing trace with hash 894489354, now seen corresponding path program 1 times [2018-12-03 19:08:35,521 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:35,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:35,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:35,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:35,523 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:35,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:35,704 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:35,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:35,705 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:35,706 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2018-12-03 19:08:35,707 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9], [15], [17] [2018-12-03 19:08:35,773 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 19:08:35,773 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 19:08:35,849 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-12-03 19:08:36,800 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 19:08:36,803 INFO L272 AbstractInterpreter]: Visited 6 different actions 99 times. Merged at 5 different actions 75 times. Widened at 4 different actions 45 times. Found 20 fixpoints after 2 different actions. Largest state had 0 variables. [2018-12-03 19:08:36,844 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:36,846 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 19:08:36,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:36,846 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 19:08:36,858 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:36,859 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:08:36,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:36,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:37,158 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:37,159 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:37,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 19:08:37,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:37,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 3] total 9 [2018-12-03 19:08:37,320 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:37,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 19:08:37,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 19:08:37,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2018-12-03 19:08:37,323 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 7 states. [2018-12-03 19:08:37,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:37,538 INFO L93 Difference]: Finished difference Result 20 states and 28 transitions. [2018-12-03 19:08:37,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 19:08:37,539 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 19:08:37,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:37,540 INFO L225 Difference]: With dead ends: 20 [2018-12-03 19:08:37,540 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 19:08:37,542 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-12-03 19:08:37,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 19:08:37,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 12. [2018-12-03 19:08:37,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 19:08:37,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2018-12-03 19:08:37,548 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 6 [2018-12-03 19:08:37,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:37,548 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2018-12-03 19:08:37,548 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 19:08:37,548 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2018-12-03 19:08:37,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 19:08:37,549 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:37,549 INFO L402 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1] [2018-12-03 19:08:37,550 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:37,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:37,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1701183725, now seen corresponding path program 2 times [2018-12-03 19:08:37,551 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:37,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:37,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:37,552 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:37,552 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:37,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:37,800 WARN L180 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-12-03 19:08:37,802 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-12-03 19:08:37,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:37,802 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:37,803 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:37,803 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:37,803 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:37,803 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 19:08:37,814 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:08:37,814 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:08:37,861 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 19:08:37,861 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:08:37,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:38,049 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 19:08:38,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:38,141 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-12-03 19:08:38,160 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:38,161 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 4] total 15 [2018-12-03 19:08:38,161 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:38,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 19:08:38,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 19:08:38,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2018-12-03 19:08:38,164 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 12 states. [2018-12-03 19:08:38,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:38,773 INFO L93 Difference]: Finished difference Result 30 states and 40 transitions. [2018-12-03 19:08:38,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 19:08:38,775 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 11 [2018-12-03 19:08:38,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:38,776 INFO L225 Difference]: With dead ends: 30 [2018-12-03 19:08:38,776 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 19:08:38,777 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=105, Invalid=275, Unknown=0, NotChecked=0, Total=380 [2018-12-03 19:08:38,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 19:08:38,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2018-12-03 19:08:38,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 19:08:38,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2018-12-03 19:08:38,783 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 11 [2018-12-03 19:08:38,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:38,783 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2018-12-03 19:08:38,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 19:08:38,783 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2018-12-03 19:08:38,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 19:08:38,784 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:38,784 INFO L402 BasicCegarLoop]: trace histogram [9, 3, 3, 1, 1, 1] [2018-12-03 19:08:38,784 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:38,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:38,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1092129078, now seen corresponding path program 3 times [2018-12-03 19:08:38,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:38,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:38,786 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:08:38,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:38,786 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:38,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:38,986 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 35 proven. 6 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2018-12-03 19:08:38,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:38,987 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:38,987 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:38,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:38,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:38,987 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 19:08:38,997 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:08:38,997 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:08:39,025 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:08:39,025 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:08:39,028 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:39,139 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-12-03 19:08:39,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:39,229 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-12-03 19:08:39,257 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:39,257 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 5] total 17 [2018-12-03 19:08:39,257 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:39,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 19:08:39,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 19:08:39,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:08:39,258 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 13 states. [2018-12-03 19:08:39,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:39,847 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2018-12-03 19:08:39,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 19:08:39,848 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 18 [2018-12-03 19:08:39,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:39,849 INFO L225 Difference]: With dead ends: 46 [2018-12-03 19:08:39,850 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 19:08:39,851 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=196, Invalid=674, Unknown=0, NotChecked=0, Total=870 [2018-12-03 19:08:39,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 19:08:39,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2018-12-03 19:08:39,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 19:08:39,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2018-12-03 19:08:39,859 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 18 [2018-12-03 19:08:39,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:39,859 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2018-12-03 19:08:39,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 19:08:39,860 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2018-12-03 19:08:39,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 19:08:39,860 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:39,861 INFO L402 BasicCegarLoop]: trace histogram [16, 4, 4, 1, 1, 1] [2018-12-03 19:08:39,861 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:39,861 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:39,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1971073885, now seen corresponding path program 4 times [2018-12-03 19:08:39,861 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:39,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:39,863 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:08:39,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:39,865 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:39,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:40,139 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 160 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-03 19:08:40,139 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:40,140 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:40,140 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:40,140 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:40,140 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:40,140 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 19:08:40,158 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:40,159 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:08:40,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:40,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:40,407 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 170 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-12-03 19:08:40,408 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:40,709 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 160 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-12-03 19:08:40,729 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:40,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 6] total 16 [2018-12-03 19:08:40,730 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:40,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 19:08:40,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 19:08:40,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:08:40,732 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 12 states. [2018-12-03 19:08:40,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:40,909 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2018-12-03 19:08:40,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 19:08:40,910 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2018-12-03 19:08:40,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:40,912 INFO L225 Difference]: With dead ends: 41 [2018-12-03 19:08:40,912 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 19:08:40,912 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2018-12-03 19:08:40,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 19:08:40,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2018-12-03 19:08:40,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 19:08:40,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2018-12-03 19:08:40,922 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 27 [2018-12-03 19:08:40,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:40,923 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2018-12-03 19:08:40,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 19:08:40,923 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2018-12-03 19:08:40,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 19:08:40,924 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:40,924 INFO L402 BasicCegarLoop]: trace histogram [20, 5, 5, 1, 1, 1] [2018-12-03 19:08:40,924 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:40,924 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:40,925 INFO L82 PathProgramCache]: Analyzing trace with hash 385916811, now seen corresponding path program 5 times [2018-12-03 19:08:40,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:40,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:40,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:40,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:40,926 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:40,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:41,231 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-12-03 19:08:41,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:41,232 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:41,232 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:41,232 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:41,232 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:41,232 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 19:08:41,241 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:08:41,241 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:08:41,285 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-12-03 19:08:41,285 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:08:41,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:41,394 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 105 proven. 10 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-12-03 19:08:41,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:41,503 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 105 proven. 10 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2018-12-03 19:08:41,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:41,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2018-12-03 19:08:41,533 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:41,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 19:08:41,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 19:08:41,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2018-12-03 19:08:41,535 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 13 states. [2018-12-03 19:08:42,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:42,857 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2018-12-03 19:08:42,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 19:08:42,858 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-12-03 19:08:42,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:42,859 INFO L225 Difference]: With dead ends: 79 [2018-12-03 19:08:42,860 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 19:08:42,862 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=383, Invalid=1873, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 19:08:42,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 19:08:42,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2018-12-03 19:08:42,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 19:08:42,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2018-12-03 19:08:42,876 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 33 [2018-12-03 19:08:42,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:42,876 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2018-12-03 19:08:42,876 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 19:08:42,876 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2018-12-03 19:08:42,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 19:08:42,878 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:42,878 INFO L402 BasicCegarLoop]: trace histogram [30, 6, 6, 1, 1, 1] [2018-12-03 19:08:42,878 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:42,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:42,879 INFO L82 PathProgramCache]: Analyzing trace with hash -747117725, now seen corresponding path program 6 times [2018-12-03 19:08:42,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:42,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:42,880 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:08:42,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:42,880 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:42,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:43,148 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2018-12-03 19:08:43,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:43,148 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:43,149 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:43,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:43,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:43,149 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:08:43,161 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:08:43,161 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:08:43,205 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:08:43,205 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:08:43,212 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:43,305 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 186 proven. 15 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2018-12-03 19:08:43,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:43,468 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 186 proven. 15 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2018-12-03 19:08:43,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:43,489 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 21 [2018-12-03 19:08:43,489 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:43,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 19:08:43,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 19:08:43,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2018-12-03 19:08:43,490 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand 15 states. [2018-12-03 19:08:44,018 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-12-03 19:08:45,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:45,241 INFO L93 Difference]: Finished difference Result 105 states and 127 transitions. [2018-12-03 19:08:45,241 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 19:08:45,241 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 45 [2018-12-03 19:08:45,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:45,242 INFO L225 Difference]: With dead ends: 105 [2018-12-03 19:08:45,242 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 19:08:45,245 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 878 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=565, Invalid=3341, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 19:08:45,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 19:08:45,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 60. [2018-12-03 19:08:45,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 19:08:45,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2018-12-03 19:08:45,260 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 45 [2018-12-03 19:08:45,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:45,260 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2018-12-03 19:08:45,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 19:08:45,261 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2018-12-03 19:08:45,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 19:08:45,262 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:45,263 INFO L402 BasicCegarLoop]: trace histogram [42, 7, 7, 1, 1, 1] [2018-12-03 19:08:45,263 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:45,263 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:45,263 INFO L82 PathProgramCache]: Analyzing trace with hash -976958341, now seen corresponding path program 7 times [2018-12-03 19:08:45,263 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:45,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:45,265 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:08:45,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:45,265 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:45,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:45,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1204 backedges. 0 proven. 1057 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2018-12-03 19:08:45,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:45,687 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:45,687 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:45,687 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:45,687 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:45,687 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:08:45,696 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:45,697 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:08:45,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:45,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:45,862 INFO L134 CoverageAnalysis]: Checked inductivity of 1204 backedges. 301 proven. 21 refuted. 0 times theorem prover too weak. 882 trivial. 0 not checked. [2018-12-03 19:08:45,862 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:46,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1204 backedges. 301 proven. 21 refuted. 0 times theorem prover too weak. 882 trivial. 0 not checked. [2018-12-03 19:08:46,033 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:46,034 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2018-12-03 19:08:46,034 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:46,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 19:08:46,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 19:08:46,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=457, Unknown=0, NotChecked=0, Total=552 [2018-12-03 19:08:46,035 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand 17 states. [2018-12-03 19:08:47,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:47,634 INFO L93 Difference]: Finished difference Result 135 states and 160 transitions. [2018-12-03 19:08:47,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 19:08:47,635 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 59 [2018-12-03 19:08:47,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:47,636 INFO L225 Difference]: With dead ends: 135 [2018-12-03 19:08:47,637 INFO L226 Difference]: Without dead ends: 84 [2018-12-03 19:08:47,640 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1569 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=761, Invalid=5559, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 19:08:47,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-12-03 19:08:47,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2018-12-03 19:08:47,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 19:08:47,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 84 transitions. [2018-12-03 19:08:47,659 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 84 transitions. Word has length 59 [2018-12-03 19:08:47,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:47,659 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 84 transitions. [2018-12-03 19:08:47,659 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 19:08:47,660 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 84 transitions. [2018-12-03 19:08:47,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 19:08:47,662 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:47,662 INFO L402 BasicCegarLoop]: trace histogram [56, 8, 8, 1, 1, 1] [2018-12-03 19:08:47,662 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:47,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:47,663 INFO L82 PathProgramCache]: Analyzing trace with hash -95013757, now seen corresponding path program 8 times [2018-12-03 19:08:47,663 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:47,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:47,664 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:47,664 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:47,664 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:47,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:48,008 INFO L134 CoverageAnalysis]: Checked inductivity of 2052 backedges. 0 proven. 1828 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-12-03 19:08:48,008 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:48,008 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:48,008 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:48,009 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:48,009 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:48,009 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:08:48,030 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:08:48,030 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:08:48,705 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-12-03 19:08:48,705 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:08:48,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:48,916 INFO L134 CoverageAnalysis]: Checked inductivity of 2052 backedges. 456 proven. 28 refuted. 0 times theorem prover too weak. 1568 trivial. 0 not checked. [2018-12-03 19:08:48,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:49,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2052 backedges. 456 proven. 28 refuted. 0 times theorem prover too weak. 1568 trivial. 0 not checked. [2018-12-03 19:08:49,247 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:49,247 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 27 [2018-12-03 19:08:49,247 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:49,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 19:08:49,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 19:08:49,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=594, Unknown=0, NotChecked=0, Total=702 [2018-12-03 19:08:49,248 INFO L87 Difference]: Start difference. First operand 76 states and 84 transitions. Second operand 19 states. [2018-12-03 19:08:52,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:52,051 INFO L93 Difference]: Finished difference Result 169 states and 197 transitions. [2018-12-03 19:08:52,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 19:08:52,052 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2018-12-03 19:08:52,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:52,053 INFO L225 Difference]: With dead ends: 169 [2018-12-03 19:08:52,054 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 19:08:52,058 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2597 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=965, Invalid=8737, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 19:08:52,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 19:08:52,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 94. [2018-12-03 19:08:52,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 19:08:52,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 103 transitions. [2018-12-03 19:08:52,083 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 103 transitions. Word has length 75 [2018-12-03 19:08:52,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:52,084 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 103 transitions. [2018-12-03 19:08:52,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 19:08:52,084 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 103 transitions. [2018-12-03 19:08:52,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 19:08:52,086 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:52,086 INFO L402 BasicCegarLoop]: trace histogram [72, 9, 9, 1, 1, 1] [2018-12-03 19:08:52,086 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:52,087 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:52,087 INFO L82 PathProgramCache]: Analyzing trace with hash -972083989, now seen corresponding path program 9 times [2018-12-03 19:08:52,087 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:52,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:52,088 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:08:52,088 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:52,088 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:52,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:52,498 INFO L134 CoverageAnalysis]: Checked inductivity of 3285 backedges. 0 proven. 2961 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2018-12-03 19:08:52,498 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:52,498 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:52,499 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:52,499 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:52,499 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:52,499 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:08:52,521 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:08:52,521 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:08:52,580 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:08:52,580 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:08:52,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:52,786 INFO L134 CoverageAnalysis]: Checked inductivity of 3285 backedges. 657 proven. 36 refuted. 0 times theorem prover too weak. 2592 trivial. 0 not checked. [2018-12-03 19:08:52,787 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:53,355 INFO L134 CoverageAnalysis]: Checked inductivity of 3285 backedges. 657 proven. 36 refuted. 0 times theorem prover too weak. 2592 trivial. 0 not checked. [2018-12-03 19:08:53,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:53,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2018-12-03 19:08:53,376 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:53,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 19:08:53,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 19:08:53,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=751, Unknown=0, NotChecked=0, Total=870 [2018-12-03 19:08:53,379 INFO L87 Difference]: Start difference. First operand 94 states and 103 transitions. Second operand 21 states. [2018-12-03 19:08:57,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:08:57,489 INFO L93 Difference]: Finished difference Result 207 states and 238 transitions. [2018-12-03 19:08:57,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 19:08:57,490 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 93 [2018-12-03 19:08:57,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:08:57,491 INFO L225 Difference]: With dead ends: 207 [2018-12-03 19:08:57,492 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 19:08:57,498 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4058 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=1171, Invalid=13109, Unknown=0, NotChecked=0, Total=14280 [2018-12-03 19:08:57,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 19:08:57,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 114. [2018-12-03 19:08:57,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 19:08:57,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 124 transitions. [2018-12-03 19:08:57,520 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 124 transitions. Word has length 93 [2018-12-03 19:08:57,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:08:57,521 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 124 transitions. [2018-12-03 19:08:57,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 19:08:57,521 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 124 transitions. [2018-12-03 19:08:57,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 19:08:57,523 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:08:57,523 INFO L402 BasicCegarLoop]: trace histogram [90, 10, 10, 1, 1, 1] [2018-12-03 19:08:57,524 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:08:57,524 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:08:57,524 INFO L82 PathProgramCache]: Analyzing trace with hash -86765277, now seen corresponding path program 10 times [2018-12-03 19:08:57,524 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:08:57,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:57,525 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:08:57,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:08:57,525 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:08:57,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:57,874 INFO L134 CoverageAnalysis]: Checked inductivity of 5005 backedges. 0 proven. 4555 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2018-12-03 19:08:57,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:57,875 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:08:57,875 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:08:57,875 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:08:57,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:08:57,875 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:08:57,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:08:57,885 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:08:57,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:08:57,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:08:58,146 INFO L134 CoverageAnalysis]: Checked inductivity of 5005 backedges. 910 proven. 45 refuted. 0 times theorem prover too weak. 4050 trivial. 0 not checked. [2018-12-03 19:08:58,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:08:58,406 INFO L134 CoverageAnalysis]: Checked inductivity of 5005 backedges. 910 proven. 45 refuted. 0 times theorem prover too weak. 4050 trivial. 0 not checked. [2018-12-03 19:08:58,427 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:08:58,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 33 [2018-12-03 19:08:58,428 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:08:58,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 19:08:58,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 19:08:58,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=928, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 19:08:58,429 INFO L87 Difference]: Start difference. First operand 114 states and 124 transitions. Second operand 23 states. [2018-12-03 19:09:02,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:09:02,515 INFO L93 Difference]: Finished difference Result 249 states and 283 transitions. [2018-12-03 19:09:02,516 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-12-03 19:09:02,516 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 113 [2018-12-03 19:09:02,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:09:02,518 INFO L225 Difference]: With dead ends: 249 [2018-12-03 19:09:02,518 INFO L226 Difference]: Without dead ends: 147 [2018-12-03 19:09:02,525 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6060 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1373, Invalid=18933, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 19:09:02,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-12-03 19:09:02,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 136. [2018-12-03 19:09:02,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 19:09:02,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 147 transitions. [2018-12-03 19:09:02,550 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 147 transitions. Word has length 113 [2018-12-03 19:09:02,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:09:02,551 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 147 transitions. [2018-12-03 19:09:02,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 19:09:02,551 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 147 transitions. [2018-12-03 19:09:02,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 19:09:02,553 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:09:02,553 INFO L402 BasicCegarLoop]: trace histogram [110, 11, 11, 1, 1, 1] [2018-12-03 19:09:02,553 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:09:02,553 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:09:02,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1978185509, now seen corresponding path program 11 times [2018-12-03 19:09:02,554 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:09:02,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:09:02,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:09:02,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:09:02,555 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:09:02,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:09:02,941 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6721 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2018-12-03 19:09:02,941 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:09:02,941 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:09:02,942 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:09:02,942 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:09:02,942 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:09:02,942 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:09:02,950 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:09:02,951 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:13:11,648 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2018-12-03 19:13:11,649 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:13:11,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:13:12,330 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6827 refuted. 0 times theorem prover too weak. 499 trivial. 0 not checked. [2018-12-03 19:13:12,330 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:13:41,855 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 19 proven. 6756 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-12-03 19:13:41,879 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:13:41,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 30, 23] total 53 [2018-12-03 19:13:41,879 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:13:41,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 19:13:41,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 19:13:41,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=2030, Unknown=10, NotChecked=0, Total=2862 [2018-12-03 19:13:41,881 INFO L87 Difference]: Start difference. First operand 136 states and 147 transitions. Second operand 32 states. [2018-12-03 19:13:42,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:13:42,482 INFO L93 Difference]: Finished difference Result 161 states and 174 transitions. [2018-12-03 19:13:42,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 19:13:42,482 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 135 [2018-12-03 19:13:42,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:13:42,484 INFO L225 Difference]: With dead ends: 161 [2018-12-03 19:13:42,484 INFO L226 Difference]: Without dead ends: 159 [2018-12-03 19:13:42,485 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 228 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1025 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=822, Invalid=2030, Unknown=10, NotChecked=0, Total=2862 [2018-12-03 19:13:42,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-12-03 19:13:42,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 148. [2018-12-03 19:13:42,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 19:13:42,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 160 transitions. [2018-12-03 19:13:42,516 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 160 transitions. Word has length 135 [2018-12-03 19:13:42,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:13:42,517 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 160 transitions. [2018-12-03 19:13:42,517 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 19:13:42,517 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 160 transitions. [2018-12-03 19:13:42,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 19:13:42,519 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:13:42,519 INFO L402 BasicCegarLoop]: trace histogram [120, 12, 12, 1, 1, 1] [2018-12-03 19:13:42,520 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:13:42,520 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:13:42,520 INFO L82 PathProgramCache]: Analyzing trace with hash 972368739, now seen corresponding path program 12 times [2018-12-03 19:13:42,520 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:13:42,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:13:42,521 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:13:42,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:13:42,521 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:13:42,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:13:43,107 INFO L134 CoverageAnalysis]: Checked inductivity of 8724 backedges. 0 proven. 8064 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2018-12-03 19:13:43,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:13:43,108 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:13:43,108 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:13:43,108 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:13:43,108 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:13:43,108 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:13:43,116 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:13:43,117 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:13:43,197 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:13:43,197 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:13:43,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:13:43,289 INFO L134 CoverageAnalysis]: Checked inductivity of 8724 backedges. 0 proven. 8064 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2018-12-03 19:13:43,290 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:13:43,691 INFO L134 CoverageAnalysis]: Checked inductivity of 8724 backedges. 0 proven. 8064 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2018-12-03 19:13:43,711 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:13:43,711 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2018-12-03 19:13:43,711 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:13:43,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 19:13:43,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 19:13:43,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:13:43,712 INFO L87 Difference]: Start difference. First operand 148 states and 160 transitions. Second operand 16 states. [2018-12-03 19:13:44,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:13:44,049 INFO L93 Difference]: Finished difference Result 173 states and 187 transitions. [2018-12-03 19:13:44,049 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 19:13:44,049 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 147 [2018-12-03 19:13:44,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:13:44,051 INFO L225 Difference]: With dead ends: 173 [2018-12-03 19:13:44,051 INFO L226 Difference]: Without dead ends: 171 [2018-12-03 19:13:44,051 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 278 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-12-03 19:13:44,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-12-03 19:13:44,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 160. [2018-12-03 19:13:44,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 19:13:44,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 173 transitions. [2018-12-03 19:13:44,080 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 173 transitions. Word has length 147 [2018-12-03 19:13:44,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:13:44,081 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 173 transitions. [2018-12-03 19:13:44,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 19:13:44,081 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 173 transitions. [2018-12-03 19:13:44,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 19:13:44,083 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:13:44,083 INFO L402 BasicCegarLoop]: trace histogram [130, 13, 13, 1, 1, 1] [2018-12-03 19:13:44,083 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:13:44,083 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:13:44,083 INFO L82 PathProgramCache]: Analyzing trace with hash 1739293163, now seen corresponding path program 13 times [2018-12-03 19:13:44,084 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:13:44,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:13:44,084 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:13:44,085 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:13:44,085 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:13:44,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:13:45,948 INFO L134 CoverageAnalysis]: Checked inductivity of 10244 backedges. 0 proven. 9529 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2018-12-03 19:13:45,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:13:45,949 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:13:45,949 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:13:45,949 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:13:45,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:13:45,949 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:13:45,960 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:13:45,960 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:13:46,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:13:46,049 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:13:46,132 INFO L134 CoverageAnalysis]: Checked inductivity of 10244 backedges. 0 proven. 9529 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2018-12-03 19:13:46,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:13:46,644 INFO L134 CoverageAnalysis]: Checked inductivity of 10244 backedges. 0 proven. 9529 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2018-12-03 19:13:46,675 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:13:46,675 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2018-12-03 19:13:46,675 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:13:46,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 19:13:46,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 19:13:46,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=647, Unknown=0, NotChecked=0, Total=930 [2018-12-03 19:13:46,676 INFO L87 Difference]: Start difference. First operand 160 states and 173 transitions. Second operand 17 states. [2018-12-03 19:13:47,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:13:47,168 INFO L93 Difference]: Finished difference Result 185 states and 200 transitions. [2018-12-03 19:13:47,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 19:13:47,168 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 159 [2018-12-03 19:13:47,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:13:47,169 INFO L225 Difference]: With dead ends: 185 [2018-12-03 19:13:47,169 INFO L226 Difference]: Without dead ends: 183 [2018-12-03 19:13:47,170 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 301 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=283, Invalid=647, Unknown=0, NotChecked=0, Total=930 [2018-12-03 19:13:47,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-12-03 19:13:47,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 172. [2018-12-03 19:13:47,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 19:13:47,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 186 transitions. [2018-12-03 19:13:47,198 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 186 transitions. Word has length 159 [2018-12-03 19:13:47,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:13:47,198 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 186 transitions. [2018-12-03 19:13:47,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 19:13:47,198 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 186 transitions. [2018-12-03 19:13:47,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 19:13:47,200 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:13:47,200 INFO L402 BasicCegarLoop]: trace histogram [140, 14, 14, 1, 1, 1] [2018-12-03 19:13:47,200 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:13:47,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:13:47,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1848396915, now seen corresponding path program 14 times [2018-12-03 19:13:47,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:13:47,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:13:47,202 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:13:47,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:13:47,202 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:13:47,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:13:47,591 INFO L134 CoverageAnalysis]: Checked inductivity of 11886 backedges. 0 proven. 11116 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2018-12-03 19:13:47,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:13:47,591 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:13:47,591 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:13:47,592 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:13:47,592 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:13:47,592 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:13:47,601 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:13:47,602 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:16:54,969 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 85 check-sat command(s) [2018-12-03 19:16:54,970 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:16:57,944 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:16:58,206 INFO L134 CoverageAnalysis]: Checked inductivity of 11886 backedges. 0 proven. 11116 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2018-12-03 19:16:58,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:16:58,779 INFO L134 CoverageAnalysis]: Checked inductivity of 11886 backedges. 0 proven. 11116 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2018-12-03 19:16:58,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:16:58,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2018-12-03 19:16:58,806 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:16:58,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 19:16:58,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 19:16:58,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 19:16:58,807 INFO L87 Difference]: Start difference. First operand 172 states and 186 transitions. Second operand 18 states. [2018-12-03 19:16:59,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:16:59,165 INFO L93 Difference]: Finished difference Result 197 states and 213 transitions. [2018-12-03 19:16:59,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 19:16:59,165 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 171 [2018-12-03 19:16:59,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:16:59,166 INFO L225 Difference]: With dead ends: 197 [2018-12-03 19:16:59,166 INFO L226 Difference]: Without dead ends: 195 [2018-12-03 19:16:59,167 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 324 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 19:16:59,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-12-03 19:16:59,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 184. [2018-12-03 19:16:59,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-12-03 19:16:59,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 199 transitions. [2018-12-03 19:16:59,198 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 199 transitions. Word has length 171 [2018-12-03 19:16:59,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:16:59,199 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 199 transitions. [2018-12-03 19:16:59,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 19:16:59,199 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 199 transitions. [2018-12-03 19:16:59,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-12-03 19:16:59,201 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:16:59,201 INFO L402 BasicCegarLoop]: trace histogram [150, 15, 15, 1, 1, 1] [2018-12-03 19:16:59,202 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:16:59,202 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:16:59,202 INFO L82 PathProgramCache]: Analyzing trace with hash -848721157, now seen corresponding path program 15 times [2018-12-03 19:16:59,202 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:16:59,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:16:59,203 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:16:59,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:16:59,203 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:16:59,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:17:00,621 INFO L134 CoverageAnalysis]: Checked inductivity of 13650 backedges. 0 proven. 12825 refuted. 0 times theorem prover too weak. 825 trivial. 0 not checked. [2018-12-03 19:17:00,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:17:00,622 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:17:00,622 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:17:00,622 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:17:00,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:17:00,622 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:17:00,630 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:17:00,631 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:17:00,732 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:17:00,732 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:17:00,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:17:00,832 INFO L134 CoverageAnalysis]: Checked inductivity of 13650 backedges. 0 proven. 12825 refuted. 0 times theorem prover too weak. 825 trivial. 0 not checked. [2018-12-03 19:17:00,832 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:17:01,539 INFO L134 CoverageAnalysis]: Checked inductivity of 13650 backedges. 0 proven. 12825 refuted. 0 times theorem prover too weak. 825 trivial. 0 not checked. [2018-12-03 19:17:01,558 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:17:01,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2018-12-03 19:17:01,559 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:17:01,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 19:17:01,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 19:17:01,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=835, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 19:17:01,560 INFO L87 Difference]: Start difference. First operand 184 states and 199 transitions. Second operand 19 states. [2018-12-03 19:17:01,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:17:01,975 INFO L93 Difference]: Finished difference Result 209 states and 226 transitions. [2018-12-03 19:17:01,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 19:17:01,975 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 183 [2018-12-03 19:17:01,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:17:01,977 INFO L225 Difference]: With dead ends: 209 [2018-12-03 19:17:01,977 INFO L226 Difference]: Without dead ends: 207 [2018-12-03 19:17:01,977 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 347 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=355, Invalid=835, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 19:17:01,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-12-03 19:17:02,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 196. [2018-12-03 19:17:02,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 19:17:02,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 212 transitions. [2018-12-03 19:17:02,020 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 212 transitions. Word has length 183 [2018-12-03 19:17:02,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:17:02,020 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 212 transitions. [2018-12-03 19:17:02,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 19:17:02,021 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 212 transitions. [2018-12-03 19:17:02,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 19:17:02,022 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:17:02,022 INFO L402 BasicCegarLoop]: trace histogram [160, 16, 16, 1, 1, 1] [2018-12-03 19:17:02,022 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:17:02,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:17:02,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1437254269, now seen corresponding path program 16 times [2018-12-03 19:17:02,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:17:02,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:17:02,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:17:02,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:17:02,024 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:17:02,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:17:02,996 INFO L134 CoverageAnalysis]: Checked inductivity of 15536 backedges. 0 proven. 14656 refuted. 0 times theorem prover too weak. 880 trivial. 0 not checked. [2018-12-03 19:17:02,996 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:17:02,996 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:17:02,997 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:17:02,997 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:17:02,997 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:17:02,997 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:17:03,006 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:17:03,007 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:17:03,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:17:03,124 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:17:03,400 INFO L134 CoverageAnalysis]: Checked inductivity of 15536 backedges. 0 proven. 14656 refuted. 0 times theorem prover too weak. 880 trivial. 0 not checked. [2018-12-03 19:17:03,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:17:04,762 INFO L134 CoverageAnalysis]: Checked inductivity of 15536 backedges. 0 proven. 14656 refuted. 0 times theorem prover too weak. 880 trivial. 0 not checked. [2018-12-03 19:17:04,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:17:04,783 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2018-12-03 19:17:04,783 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:17:04,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 19:17:04,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 19:17:04,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=938, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 19:17:04,784 INFO L87 Difference]: Start difference. First operand 196 states and 212 transitions. Second operand 20 states. [2018-12-03 19:17:05,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:17:05,336 INFO L93 Difference]: Finished difference Result 221 states and 239 transitions. [2018-12-03 19:17:05,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 19:17:05,337 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2018-12-03 19:17:05,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:17:05,338 INFO L225 Difference]: With dead ends: 221 [2018-12-03 19:17:05,338 INFO L226 Difference]: Without dead ends: 219 [2018-12-03 19:17:05,339 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 370 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=394, Invalid=938, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 19:17:05,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-12-03 19:17:05,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 208. [2018-12-03 19:17:05,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-12-03 19:17:05,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 225 transitions. [2018-12-03 19:17:05,382 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 225 transitions. Word has length 195 [2018-12-03 19:17:05,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:17:05,383 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 225 transitions. [2018-12-03 19:17:05,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 19:17:05,383 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 225 transitions. [2018-12-03 19:17:05,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-12-03 19:17:05,384 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:17:05,384 INFO L402 BasicCegarLoop]: trace histogram [170, 17, 17, 1, 1, 1] [2018-12-03 19:17:05,385 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:17:05,385 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:17:05,385 INFO L82 PathProgramCache]: Analyzing trace with hash 1323394059, now seen corresponding path program 17 times [2018-12-03 19:17:05,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:17:05,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:17:05,387 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:17:05,387 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:17:05,387 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:17:05,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:17:05,954 INFO L134 CoverageAnalysis]: Checked inductivity of 17544 backedges. 0 proven. 16609 refuted. 0 times theorem prover too weak. 935 trivial. 0 not checked. [2018-12-03 19:17:05,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:17:05,954 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:17:05,954 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:17:05,954 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:17:05,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:17:05,954 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:17:05,964 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:17:05,964 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 19:21:45,938 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 98 check-sat command(s) [2018-12-03 19:21:45,938 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:21:47,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:21:47,341 INFO L134 CoverageAnalysis]: Checked inductivity of 17544 backedges. 0 proven. 16609 refuted. 0 times theorem prover too weak. 935 trivial. 0 not checked. [2018-12-03 19:21:47,341 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:21:48,192 INFO L134 CoverageAnalysis]: Checked inductivity of 17544 backedges. 0 proven. 16609 refuted. 0 times theorem prover too weak. 935 trivial. 0 not checked. [2018-12-03 19:21:48,202 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:21:48,203 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 38 [2018-12-03 19:21:48,203 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:21:48,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 19:21:48,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 19:21:48,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=1047, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 19:21:48,204 INFO L87 Difference]: Start difference. First operand 208 states and 225 transitions. Second operand 21 states. [2018-12-03 19:21:48,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:21:48,702 INFO L93 Difference]: Finished difference Result 233 states and 252 transitions. [2018-12-03 19:21:48,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 19:21:48,702 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 207 [2018-12-03 19:21:48,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:21:48,704 INFO L225 Difference]: With dead ends: 233 [2018-12-03 19:21:48,704 INFO L226 Difference]: Without dead ends: 231 [2018-12-03 19:21:48,705 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 393 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=435, Invalid=1047, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 19:21:48,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2018-12-03 19:21:48,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 220. [2018-12-03 19:21:48,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-12-03 19:21:48,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 238 transitions. [2018-12-03 19:21:48,749 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 238 transitions. Word has length 207 [2018-12-03 19:21:48,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:21:48,750 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 238 transitions. [2018-12-03 19:21:48,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 19:21:48,750 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 238 transitions. [2018-12-03 19:21:48,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-12-03 19:21:48,751 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:21:48,751 INFO L402 BasicCegarLoop]: trace histogram [180, 18, 18, 1, 1, 1] [2018-12-03 19:21:48,752 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:21:48,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:21:48,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1442840941, now seen corresponding path program 18 times [2018-12-03 19:21:48,752 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:21:48,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:21:48,753 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:21:48,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:21:48,753 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:21:48,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:21:49,647 INFO L134 CoverageAnalysis]: Checked inductivity of 19674 backedges. 0 proven. 18684 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-12-03 19:21:49,647 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:21:49,648 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:21:49,648 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:21:49,648 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:21:49,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:21:49,648 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:21:49,658 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 19:21:49,659 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 19:21:49,778 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 19:21:49,778 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 19:21:49,784 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:21:49,900 INFO L134 CoverageAnalysis]: Checked inductivity of 19674 backedges. 0 proven. 18684 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-12-03 19:21:49,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:21:50,761 INFO L134 CoverageAnalysis]: Checked inductivity of 19674 backedges. 0 proven. 18684 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-12-03 19:21:50,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:21:50,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 40 [2018-12-03 19:21:50,783 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:21:50,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 19:21:50,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 19:21:50,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=1162, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 19:21:50,784 INFO L87 Difference]: Start difference. First operand 220 states and 238 transitions. Second operand 22 states. [2018-12-03 19:21:51,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:21:51,340 INFO L93 Difference]: Finished difference Result 245 states and 265 transitions. [2018-12-03 19:21:51,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 19:21:51,341 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 219 [2018-12-03 19:21:51,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:21:51,342 INFO L225 Difference]: With dead ends: 245 [2018-12-03 19:21:51,342 INFO L226 Difference]: Without dead ends: 243 [2018-12-03 19:21:51,342 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 416 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=478, Invalid=1162, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 19:21:51,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2018-12-03 19:21:51,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 232. [2018-12-03 19:21:51,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-12-03 19:21:51,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 251 transitions. [2018-12-03 19:21:51,389 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 251 transitions. Word has length 219 [2018-12-03 19:21:51,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:21:51,390 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 251 transitions. [2018-12-03 19:21:51,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 19:21:51,390 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 251 transitions. [2018-12-03 19:21:51,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-12-03 19:21:51,391 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:21:51,391 INFO L402 BasicCegarLoop]: trace histogram [190, 19, 19, 1, 1, 1] [2018-12-03 19:21:51,392 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:21:51,392 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:21:51,392 INFO L82 PathProgramCache]: Analyzing trace with hash -811397861, now seen corresponding path program 19 times [2018-12-03 19:21:51,392 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:21:51,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:21:51,393 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 19:21:51,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:21:51,393 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:21:51,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:21:51,960 INFO L134 CoverageAnalysis]: Checked inductivity of 21926 backedges. 0 proven. 20881 refuted. 0 times theorem prover too weak. 1045 trivial. 0 not checked. [2018-12-03 19:21:51,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:21:51,960 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:21:51,960 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:21:51,960 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:21:51,960 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:21:51,960 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:21:51,969 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:21:51,969 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 19:21:52,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:21:52,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 19:21:52,245 INFO L134 CoverageAnalysis]: Checked inductivity of 21926 backedges. 0 proven. 20881 refuted. 0 times theorem prover too weak. 1045 trivial. 0 not checked. [2018-12-03 19:21:52,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 19:21:53,185 INFO L134 CoverageAnalysis]: Checked inductivity of 21926 backedges. 0 proven. 20881 refuted. 0 times theorem prover too weak. 1045 trivial. 0 not checked. [2018-12-03 19:21:53,205 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 19:21:53,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 42 [2018-12-03 19:21:53,206 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 19:21:53,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 19:21:53,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 19:21:53,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=523, Invalid=1283, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 19:21:53,207 INFO L87 Difference]: Start difference. First operand 232 states and 251 transitions. Second operand 23 states. [2018-12-03 19:21:53,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 19:21:53,805 INFO L93 Difference]: Finished difference Result 257 states and 278 transitions. [2018-12-03 19:21:53,805 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 19:21:53,805 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 231 [2018-12-03 19:21:53,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 19:21:53,806 INFO L225 Difference]: With dead ends: 257 [2018-12-03 19:21:53,807 INFO L226 Difference]: Without dead ends: 255 [2018-12-03 19:21:53,807 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 439 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=523, Invalid=1283, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 19:21:53,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2018-12-03 19:21:53,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 244. [2018-12-03 19:21:53,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2018-12-03 19:21:53,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 264 transitions. [2018-12-03 19:21:53,866 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 264 transitions. Word has length 231 [2018-12-03 19:21:53,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 19:21:53,867 INFO L480 AbstractCegarLoop]: Abstraction has 244 states and 264 transitions. [2018-12-03 19:21:53,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 19:21:53,867 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 264 transitions. [2018-12-03 19:21:53,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2018-12-03 19:21:53,868 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 19:21:53,868 INFO L402 BasicCegarLoop]: trace histogram [200, 20, 20, 1, 1, 1] [2018-12-03 19:21:53,868 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 19:21:53,868 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 19:21:53,868 INFO L82 PathProgramCache]: Analyzing trace with hash 2025623459, now seen corresponding path program 20 times [2018-12-03 19:21:53,868 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 19:21:53,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:21:53,869 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 19:21:53,869 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 19:21:53,869 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 19:21:53,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 19:21:55,240 INFO L134 CoverageAnalysis]: Checked inductivity of 24300 backedges. 0 proven. 23200 refuted. 0 times theorem prover too weak. 1100 trivial. 0 not checked. [2018-12-03 19:21:55,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:21:55,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 19:21:55,241 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 19:21:55,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 19:21:55,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 19:21:55,241 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 19:21:55,252 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 19:21:55,252 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP)