java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 17:47:57,917 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 17:47:57,919 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 17:47:57,935 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 17:47:57,936 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 17:47:57,937 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 17:47:57,939 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 17:47:57,941 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 17:47:57,944 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 17:47:57,944 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 17:47:57,945 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 17:47:57,990 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf [2018-12-03 17:47:58,004 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 17:47:58,004 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 17:47:58,005 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 17:47:58,006 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 17:47:58,008 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 17:47:58,008 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 17:47:58,008 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 17:47:58,009 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 17:47:58,009 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 17:47:58,009 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 17:47:58,009 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 17:47:58,009 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 17:47:58,009 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 17:47:58,010 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 17:47:58,010 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 17:47:58,012 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 17:47:58,012 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 17:47:58,012 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 17:47:58,012 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 17:47:58,012 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 17:47:58,013 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 17:47:58,013 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 17:47:58,013 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 17:47:58,013 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 17:47:58,013 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 17:47:58,013 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 17:47:58,016 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 17:47:58,016 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 17:47:58,016 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 17:47:58,016 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 17:47:58,016 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 17:47:58,017 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 17:47:58,017 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 17:47:58,017 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 17:47:58,017 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 17:47:58,017 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 17:47:58,018 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 17:47:58,018 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 17:47:58,018 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 17:47:58,055 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 17:47:58,069 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 17:47:58,075 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 17:47:58,077 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 17:47:58,077 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 17:47:58,078 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl [2018-12-03 17:47:58,078 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl' [2018-12-03 17:47:58,119 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 17:47:58,120 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 17:47:58,121 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 17:47:58,121 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 17:47:58,121 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 17:47:58,138 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,147 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,155 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 17:47:58,156 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 17:47:58,157 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 17:47:58,157 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 17:47:58,169 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,169 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,170 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,170 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,174 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,175 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,176 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 05:47:58" (1/1) ... [2018-12-03 17:47:58,178 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 17:47:58,178 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 17:47:58,179 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 17:47:58,179 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 17:47:58,180 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 05:47:58" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory: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 17:47:58,242 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 17:47:58,242 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 17:47:58,492 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 17:47:58,493 INFO L280 CfgBuilder]: Removed 2 assue(true) statements. [2018-12-03 17:47:58,493 INFO L202 PluginConnector]: Adding new model nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 05:47:58 BoogieIcfgContainer [2018-12-03 17:47:58,494 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 17:47:58,495 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 17:47:58,495 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 17:47:58,498 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 17:47:58,499 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 05:47:58" (1/2) ... [2018-12-03 17:47:58,500 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57055999 and model type nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 05:47:58, skipping insertion in model container [2018-12-03 17:47:58,500 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 05:47:58" (2/2) ... [2018-12-03 17:47:58,502 INFO L112 eAbstractionObserver]: Analyzing ICFG nested1.i_4.bpl [2018-12-03 17:47:58,514 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 17:47:58,524 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 17:47:58,545 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 17:47:58,583 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 17:47:58,583 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 17:47:58,584 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 17:47:58,584 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 17:47:58,584 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 17:47:58,584 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 17:47:58,585 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 17:47:58,585 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 17:47:58,603 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states. [2018-12-03 17:47:58,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 17:47:58,609 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:47:58,610 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 17:47:58,613 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:47:58,619 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:47:58,620 INFO L82 PathProgramCache]: Analyzing trace with hash 29955, now seen corresponding path program 1 times [2018-12-03 17:47:58,622 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:47:58,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:47:58,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:47:58,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:47:58,671 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:47:58,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:47:58,961 WARN L180 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 9 [2018-12-03 17:47:58,964 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 17:47:58,967 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 17:47:58,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-03 17:47:58,967 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 17:47:58,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 17:47:58,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 17:47:58,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 17:47:58,987 INFO L87 Difference]: Start difference. First operand 5 states. Second operand 3 states. [2018-12-03 17:47:59,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:47:59,055 INFO L93 Difference]: Finished difference Result 11 states and 17 transitions. [2018-12-03 17:47:59,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 17:47:59,058 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 17:47:59,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:47:59,070 INFO L225 Difference]: With dead ends: 11 [2018-12-03 17:47:59,071 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 17:47:59,074 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 17:47:59,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 17:47:59,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 6. [2018-12-03 17:47:59,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-12-03 17:47:59,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 7 transitions. [2018-12-03 17:47:59,111 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 7 transitions. Word has length 3 [2018-12-03 17:47:59,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:47:59,111 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 7 transitions. [2018-12-03 17:47:59,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 17:47:59,112 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 7 transitions. [2018-12-03 17:47:59,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 17:47:59,112 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:47:59,112 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 17:47:59,113 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:47:59,113 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:47:59,113 INFO L82 PathProgramCache]: Analyzing trace with hash 28852267, now seen corresponding path program 1 times [2018-12-03 17:47:59,113 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:47:59,114 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:47:59,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:47:59,115 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:47:59,115 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:47:59,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:47:59,205 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 17:47:59,205 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 17:47:59,206 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 17:47:59,206 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 17:47:59,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 17:47:59,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 17:47:59,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 17:47:59,209 INFO L87 Difference]: Start difference. First operand 6 states and 7 transitions. Second operand 3 states. [2018-12-03 17:47:59,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:47:59,263 INFO L93 Difference]: Finished difference Result 11 states and 14 transitions. [2018-12-03 17:47:59,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 17:47:59,264 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2018-12-03 17:47:59,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:47:59,264 INFO L225 Difference]: With dead ends: 11 [2018-12-03 17:47:59,264 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 17:47:59,266 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 17:47:59,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 17:47:59,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 17:47:59,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 17:47:59,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2018-12-03 17:47:59,269 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2018-12-03 17:47:59,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:47:59,269 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2018-12-03 17:47:59,269 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 17:47:59,270 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2018-12-03 17:47:59,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 17:47:59,270 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:47:59,270 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 17:47:59,270 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:47:59,271 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:47:59,271 INFO L82 PathProgramCache]: Analyzing trace with hash 894489354, now seen corresponding path program 1 times [2018-12-03 17:47:59,271 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:47:59,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:47:59,272 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:47:59,272 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:47:59,273 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:47:59,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:47:59,452 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 17:47:59,452 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:47:59,452 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:47:59,453 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 7 with the following transitions: [2018-12-03 17:47:59,455 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9], [15], [17] [2018-12-03 17:47:59,517 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 17:47:59,518 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 17:47:59,620 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-12-03 17:48:00,818 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 17:48:00,820 INFO L272 AbstractInterpreter]: Visited 6 different actions 102 times. Merged at 5 different actions 69 times. Widened at 4 different actions 42 times. Found 23 fixpoints after 3 different actions. Largest state had 0 variables. [2018-12-03 17:48:00,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:00,868 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 17:48:00,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:00,868 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 17:48:00,884 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:48:00,884 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:48:00,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:00,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:01,057 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 17:48:01,058 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:01,202 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 17:48:01,237 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:01,237 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 3] total 9 [2018-12-03 17:48:01,237 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:01,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 17:48:01,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 17:48:01,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2018-12-03 17:48:01,239 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 7 states. [2018-12-03 17:48:01,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:01,571 INFO L93 Difference]: Finished difference Result 20 states and 28 transitions. [2018-12-03 17:48:01,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 17:48:01,571 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 6 [2018-12-03 17:48:01,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:01,572 INFO L225 Difference]: With dead ends: 20 [2018-12-03 17:48:01,572 INFO L226 Difference]: Without dead ends: 15 [2018-12-03 17:48:01,573 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-12-03 17:48:01,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-12-03 17:48:01,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 12. [2018-12-03 17:48:01,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 17:48:01,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2018-12-03 17:48:01,578 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 6 [2018-12-03 17:48:01,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:01,578 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2018-12-03 17:48:01,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 17:48:01,579 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2018-12-03 17:48:01,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 17:48:01,579 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:01,579 INFO L402 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1] [2018-12-03 17:48:01,581 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:01,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:01,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1701183725, now seen corresponding path program 2 times [2018-12-03 17:48:01,582 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:01,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:01,583 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:48:01,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:01,583 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:01,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:01,847 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-12-03 17:48:01,849 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 17:48:01,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:01,849 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:01,850 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:01,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:01,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:01,850 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 17:48:01,861 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:48:01,861 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:48:01,887 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 17:48:01,887 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:48:01,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:02,089 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 17:48:02,089 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:02,166 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 17:48:02,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:02,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 4] total 15 [2018-12-03 17:48:02,187 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:02,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 17:48:02,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 17:48:02,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2018-12-03 17:48:02,189 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 12 states. [2018-12-03 17:48:02,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:02,815 INFO L93 Difference]: Finished difference Result 30 states and 40 transitions. [2018-12-03 17:48:02,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 17:48:02,818 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 11 [2018-12-03 17:48:02,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:02,819 INFO L225 Difference]: With dead ends: 30 [2018-12-03 17:48:02,819 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 17:48:02,820 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 17:48:02,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 17:48:02,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2018-12-03 17:48:02,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 17:48:02,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2018-12-03 17:48:02,826 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 11 [2018-12-03 17:48:02,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:02,827 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2018-12-03 17:48:02,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 17:48:02,827 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2018-12-03 17:48:02,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 17:48:02,828 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:02,828 INFO L402 BasicCegarLoop]: trace histogram [9, 3, 3, 1, 1, 1] [2018-12-03 17:48:02,828 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:02,828 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:02,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1092129078, now seen corresponding path program 3 times [2018-12-03 17:48:02,829 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:02,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:02,830 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:48:02,830 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:02,830 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:02,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:03,023 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 17:48:03,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:03,023 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:03,024 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:03,024 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:03,024 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:03,024 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 17:48:03,033 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:48:03,033 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:48:03,066 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:48:03,066 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:48:03,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:03,180 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 17:48:03,180 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:03,287 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 17:48:03,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:03,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 5] total 17 [2018-12-03 17:48:03,313 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:03,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 17:48:03,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 17:48:03,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-12-03 17:48:03,314 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 13 states. [2018-12-03 17:48:03,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:03,874 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2018-12-03 17:48:03,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 17:48:03,874 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 18 [2018-12-03 17:48:03,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:03,875 INFO L225 Difference]: With dead ends: 46 [2018-12-03 17:48:03,875 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 17:48:03,876 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=196, Invalid=674, Unknown=0, NotChecked=0, Total=870 [2018-12-03 17:48:03,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 17:48:03,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2018-12-03 17:48:03,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 17:48:03,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2018-12-03 17:48:03,884 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 18 [2018-12-03 17:48:03,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:03,884 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2018-12-03 17:48:03,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 17:48:03,885 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2018-12-03 17:48:03,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 17:48:03,886 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:03,886 INFO L402 BasicCegarLoop]: trace histogram [16, 4, 4, 1, 1, 1] [2018-12-03 17:48:03,886 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:03,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:03,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1971073885, now seen corresponding path program 4 times [2018-12-03 17:48:03,887 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:03,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:03,888 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:48:03,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:03,888 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:03,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:04,169 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 17:48:04,170 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:04,170 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:04,170 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:04,170 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:04,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:04,171 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 17:48:04,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:48:04,187 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:48:04,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:04,213 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:04,408 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 17:48:04,409 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:04,609 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 17:48:04,630 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:04,630 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 6] total 16 [2018-12-03 17:48:04,630 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:04,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 17:48:04,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 17:48:04,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2018-12-03 17:48:04,632 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 12 states. [2018-12-03 17:48:04,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:04,791 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2018-12-03 17:48:04,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 17:48:04,792 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2018-12-03 17:48:04,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:04,793 INFO L225 Difference]: With dead ends: 41 [2018-12-03 17:48:04,794 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 17:48:04,794 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=94, Invalid=178, Unknown=0, NotChecked=0, Total=272 [2018-12-03 17:48:04,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 17:48:04,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2018-12-03 17:48:04,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 17:48:04,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2018-12-03 17:48:04,804 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 27 [2018-12-03 17:48:04,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:04,805 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2018-12-03 17:48:04,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 17:48:04,805 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2018-12-03 17:48:04,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 17:48:04,806 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:04,806 INFO L402 BasicCegarLoop]: trace histogram [20, 5, 5, 1, 1, 1] [2018-12-03 17:48:04,806 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:04,807 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:04,807 INFO L82 PathProgramCache]: Analyzing trace with hash 385916811, now seen corresponding path program 5 times [2018-12-03 17:48:04,807 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:04,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:04,808 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:48:04,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:04,808 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:04,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:05,101 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 17:48:05,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:05,102 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:05,102 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:05,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:05,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:05,102 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 17:48:05,111 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:48:05,111 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:48:05,143 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-12-03 17:48:05,143 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:48:05,145 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:05,317 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 17:48:05,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:05,466 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 17:48:05,495 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:05,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2018-12-03 17:48:05,495 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:05,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 17:48:05,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 17:48:05,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2018-12-03 17:48:05,499 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 13 states. [2018-12-03 17:48:06,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:06,842 INFO L93 Difference]: Finished difference Result 79 states and 98 transitions. [2018-12-03 17:48:06,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 17:48:06,843 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2018-12-03 17:48:06,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:06,844 INFO L225 Difference]: With dead ends: 79 [2018-12-03 17:48:06,844 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 17:48:06,846 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=383, Invalid=1873, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 17:48:06,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 17:48:06,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 46. [2018-12-03 17:48:06,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 17:48:06,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2018-12-03 17:48:06,859 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 33 [2018-12-03 17:48:06,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:06,859 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2018-12-03 17:48:06,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 17:48:06,859 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2018-12-03 17:48:06,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 17:48:06,861 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:06,861 INFO L402 BasicCegarLoop]: trace histogram [30, 6, 6, 1, 1, 1] [2018-12-03 17:48:06,861 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:06,862 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:06,862 INFO L82 PathProgramCache]: Analyzing trace with hash -747117725, now seen corresponding path program 6 times [2018-12-03 17:48:06,862 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:06,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:06,863 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:48:06,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:06,863 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:06,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:07,228 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 17:48:07,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:07,228 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:07,229 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:07,229 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:07,229 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:07,229 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 17:48:07,242 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:48:07,242 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:48:07,273 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:48:07,273 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:48:07,276 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:07,363 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 17:48:07,363 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:07,519 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 17:48:07,538 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:07,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 21 [2018-12-03 17:48:07,539 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:07,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 17:48:07,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 17:48:07,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2018-12-03 17:48:07,541 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand 15 states. [2018-12-03 17:48:09,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:09,079 INFO L93 Difference]: Finished difference Result 105 states and 127 transitions. [2018-12-03 17:48:09,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 17:48:09,080 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 45 [2018-12-03 17:48:09,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:09,081 INFO L225 Difference]: With dead ends: 105 [2018-12-03 17:48:09,081 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 17:48:09,083 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 878 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=565, Invalid=3341, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 17:48:09,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 17:48:09,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 60. [2018-12-03 17:48:09,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 17:48:09,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2018-12-03 17:48:09,098 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 45 [2018-12-03 17:48:09,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:09,098 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2018-12-03 17:48:09,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 17:48:09,099 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2018-12-03 17:48:09,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 17:48:09,100 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:09,101 INFO L402 BasicCegarLoop]: trace histogram [42, 7, 7, 1, 1, 1] [2018-12-03 17:48:09,101 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:09,101 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:09,101 INFO L82 PathProgramCache]: Analyzing trace with hash -976958341, now seen corresponding path program 7 times [2018-12-03 17:48:09,101 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:09,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:09,102 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:48:09,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:09,103 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:09,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:09,279 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 17:48:09,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:09,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:09,280 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:09,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:09,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:09,280 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 17:48:09,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:48:09,290 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:48:09,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:09,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:09,623 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 17:48:09,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:09,788 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 17:48:09,808 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:09,808 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2018-12-03 17:48:09,808 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:09,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 17:48:09,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 17:48:09,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=457, Unknown=0, NotChecked=0, Total=552 [2018-12-03 17:48:09,810 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand 17 states. [2018-12-03 17:48:11,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:11,583 INFO L93 Difference]: Finished difference Result 135 states and 160 transitions. [2018-12-03 17:48:11,583 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 17:48:11,583 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 59 [2018-12-03 17:48:11,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:11,584 INFO L225 Difference]: With dead ends: 135 [2018-12-03 17:48:11,584 INFO L226 Difference]: Without dead ends: 84 [2018-12-03 17:48:11,587 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1569 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=761, Invalid=5559, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 17:48:11,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-12-03 17:48:11,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2018-12-03 17:48:11,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 17:48:11,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 84 transitions. [2018-12-03 17:48:11,608 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 84 transitions. Word has length 59 [2018-12-03 17:48:11,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:11,608 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 84 transitions. [2018-12-03 17:48:11,609 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 17:48:11,609 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 84 transitions. [2018-12-03 17:48:11,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 17:48:11,611 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:11,611 INFO L402 BasicCegarLoop]: trace histogram [56, 8, 8, 1, 1, 1] [2018-12-03 17:48:11,611 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:11,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:11,612 INFO L82 PathProgramCache]: Analyzing trace with hash -95013757, now seen corresponding path program 8 times [2018-12-03 17:48:11,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:11,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:11,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:48:11,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:11,613 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:11,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:12,070 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 17:48:12,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:12,071 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:12,071 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:12,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:12,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:12,072 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 17:48:12,084 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:48:12,084 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:48:12,671 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-12-03 17:48:12,671 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:48:12,679 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:12,802 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 17:48:12,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:13,019 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 17:48:13,042 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:13,042 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 27 [2018-12-03 17:48:13,042 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:13,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 17:48:13,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 17:48:13,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=594, Unknown=0, NotChecked=0, Total=702 [2018-12-03 17:48:13,043 INFO L87 Difference]: Start difference. First operand 76 states and 84 transitions. Second operand 19 states. [2018-12-03 17:48:16,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:16,054 INFO L93 Difference]: Finished difference Result 169 states and 197 transitions. [2018-12-03 17:48:16,054 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 17:48:16,054 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2018-12-03 17:48:16,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:16,055 INFO L225 Difference]: With dead ends: 169 [2018-12-03 17:48:16,056 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 17:48:16,062 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 17:48:16,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 17:48:16,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 94. [2018-12-03 17:48:16,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 17:48:16,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 103 transitions. [2018-12-03 17:48:16,104 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 103 transitions. Word has length 75 [2018-12-03 17:48:16,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:16,104 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 103 transitions. [2018-12-03 17:48:16,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 17:48:16,105 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 103 transitions. [2018-12-03 17:48:16,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 17:48:16,108 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:16,108 INFO L402 BasicCegarLoop]: trace histogram [72, 9, 9, 1, 1, 1] [2018-12-03 17:48:16,108 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:16,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:16,109 INFO L82 PathProgramCache]: Analyzing trace with hash -972083989, now seen corresponding path program 9 times [2018-12-03 17:48:16,109 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:16,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:16,110 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:48:16,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:16,110 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:16,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:16,537 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 17:48:16,537 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:16,537 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:16,537 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:16,537 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:16,538 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:16,538 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 17:48:16,547 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:48:16,548 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:48:16,617 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:48:16,617 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:48:16,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:16,792 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 17:48:16,792 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:17,174 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 17:48:17,193 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:17,193 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 30 [2018-12-03 17:48:17,194 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:17,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 17:48:17,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 17:48:17,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=751, Unknown=0, NotChecked=0, Total=870 [2018-12-03 17:48:17,195 INFO L87 Difference]: Start difference. First operand 94 states and 103 transitions. Second operand 21 states. [2018-12-03 17:48:20,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:20,463 INFO L93 Difference]: Finished difference Result 207 states and 238 transitions. [2018-12-03 17:48:20,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 17:48:20,463 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 93 [2018-12-03 17:48:20,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:20,465 INFO L225 Difference]: With dead ends: 207 [2018-12-03 17:48:20,465 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 17:48:20,473 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4058 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1171, Invalid=13109, Unknown=0, NotChecked=0, Total=14280 [2018-12-03 17:48:20,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 17:48:20,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 114. [2018-12-03 17:48:20,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 17:48:20,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 124 transitions. [2018-12-03 17:48:20,507 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 124 transitions. Word has length 93 [2018-12-03 17:48:20,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:20,508 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 124 transitions. [2018-12-03 17:48:20,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 17:48:20,508 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 124 transitions. [2018-12-03 17:48:20,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 17:48:20,509 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:20,510 INFO L402 BasicCegarLoop]: trace histogram [90, 10, 10, 1, 1, 1] [2018-12-03 17:48:20,510 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:20,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:20,510 INFO L82 PathProgramCache]: Analyzing trace with hash -86765277, now seen corresponding path program 10 times [2018-12-03 17:48:20,510 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:20,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:20,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:48:20,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:20,512 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:20,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:21,025 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 17:48:21,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:21,026 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:21,026 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:21,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:21,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:21,026 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 17:48:21,037 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:48:21,037 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:48:21,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:21,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:48:21,314 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 17:48:21,314 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:48:21,586 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 17:48:21,607 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:48:21,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 33 [2018-12-03 17:48:21,608 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:48:21,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 17:48:21,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 17:48:21,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=928, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 17:48:21,611 INFO L87 Difference]: Start difference. First operand 114 states and 124 transitions. Second operand 23 states. [2018-12-03 17:48:25,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:48:25,521 INFO L93 Difference]: Finished difference Result 249 states and 283 transitions. [2018-12-03 17:48:25,521 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-12-03 17:48:25,521 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 113 [2018-12-03 17:48:25,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:48:25,523 INFO L225 Difference]: With dead ends: 249 [2018-12-03 17:48:25,523 INFO L226 Difference]: Without dead ends: 147 [2018-12-03 17:48:25,530 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6060 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1373, Invalid=18933, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 17:48:25,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-12-03 17:48:25,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 136. [2018-12-03 17:48:25,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 17:48:25,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 147 transitions. [2018-12-03 17:48:25,554 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 147 transitions. Word has length 113 [2018-12-03 17:48:25,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:48:25,554 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 147 transitions. [2018-12-03 17:48:25,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 17:48:25,555 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 147 transitions. [2018-12-03 17:48:25,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 17:48:25,557 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:48:25,557 INFO L402 BasicCegarLoop]: trace histogram [110, 11, 11, 1, 1, 1] [2018-12-03 17:48:25,557 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:48:25,557 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:48:25,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1978185509, now seen corresponding path program 11 times [2018-12-03 17:48:25,558 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:48:25,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:25,559 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:48:25,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:48:25,559 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:48:25,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:48:26,522 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 17:48:26,522 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:26,522 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:48:26,523 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:48:26,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:48:26,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:48:26,523 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 17:48:26,532 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:48:26,532 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:52:39,053 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2018-12-03 17:52:39,053 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:52:39,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:52:39,930 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 17:52:39,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:53:00,340 INFO L134 CoverageAnalysis]: Checked inductivity of 7326 backedges. 0 proven. 6598 refuted. 123 times theorem prover too weak. 605 trivial. 0 not checked. [2018-12-03 17:53:00,367 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:53:00,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 14] total 27 [2018-12-03 17:53:00,367 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:53:00,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 17:53:00,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 17:53:00,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=513, Unknown=8, NotChecked=0, Total=756 [2018-12-03 17:53:00,369 INFO L87 Difference]: Start difference. First operand 136 states and 147 transitions. Second operand 15 states. [2018-12-03 17:53:00,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:53:00,635 INFO L93 Difference]: Finished difference Result 161 states and 174 transitions. [2018-12-03 17:53:00,636 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 17:53:00,636 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2018-12-03 17:53:00,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:53:00,637 INFO L225 Difference]: With dead ends: 161 [2018-12-03 17:53:00,638 INFO L226 Difference]: Without dead ends: 159 [2018-12-03 17:53:00,638 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 253 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=235, Invalid=513, Unknown=8, NotChecked=0, Total=756 [2018-12-03 17:53:00,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-12-03 17:53:00,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 148. [2018-12-03 17:53:00,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 17:53:00,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 160 transitions. [2018-12-03 17:53:00,667 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 160 transitions. Word has length 135 [2018-12-03 17:53:00,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:53:00,668 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 160 transitions. [2018-12-03 17:53:00,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 17:53:00,668 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 160 transitions. [2018-12-03 17:53:00,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 17:53:00,670 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:53:00,670 INFO L402 BasicCegarLoop]: trace histogram [120, 12, 12, 1, 1, 1] [2018-12-03 17:53:00,670 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:53:00,670 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:53:00,670 INFO L82 PathProgramCache]: Analyzing trace with hash 972368739, now seen corresponding path program 12 times [2018-12-03 17:53:00,671 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:53:00,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:53:00,672 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:53:00,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:53:00,672 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:53:00,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:53:01,240 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 17:53:01,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:53:01,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:53:01,241 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:53:01,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:53:01,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:53:01,241 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 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 17:53:01,251 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:53:01,251 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:53:01,335 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:53:01,336 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:53:01,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:53:01,423 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 17:53:01,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:53:01,825 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 17:53:01,845 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:53:01,845 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2018-12-03 17:53:01,845 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:53:01,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 17:53:01,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 17:53:01,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=562, Unknown=0, NotChecked=0, Total=812 [2018-12-03 17:53:01,846 INFO L87 Difference]: Start difference. First operand 148 states and 160 transitions. Second operand 16 states. [2018-12-03 17:53:02,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:53:02,247 INFO L93 Difference]: Finished difference Result 173 states and 187 transitions. [2018-12-03 17:53:02,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 17:53:02,248 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 147 [2018-12-03 17:53:02,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:53:02,249 INFO L225 Difference]: With dead ends: 173 [2018-12-03 17:53:02,250 INFO L226 Difference]: Without dead ends: 171 [2018-12-03 17:53:02,250 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 17:53:02,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-12-03 17:53:02,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 160. [2018-12-03 17:53:02,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 17:53:02,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 173 transitions. [2018-12-03 17:53:02,275 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 173 transitions. Word has length 147 [2018-12-03 17:53:02,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:53:02,276 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 173 transitions. [2018-12-03 17:53:02,276 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 17:53:02,276 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 173 transitions. [2018-12-03 17:53:02,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 17:53:02,278 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:53:02,278 INFO L402 BasicCegarLoop]: trace histogram [130, 13, 13, 1, 1, 1] [2018-12-03 17:53:02,278 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:53:02,279 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:53:02,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1739293163, now seen corresponding path program 13 times [2018-12-03 17:53:02,279 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:53:02,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:53:02,280 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:53:02,280 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:53:02,280 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:53:02,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:53:03,268 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 17:53:03,268 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:53:03,268 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:53:03,269 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:53:03,269 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:53:03,269 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:53:03,269 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 17:53:03,279 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:53:03,279 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:53:03,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:53:03,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:53:03,452 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 17:53:03,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:53:04,044 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 17:53:04,077 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:53:04,077 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2018-12-03 17:53:04,077 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:53:04,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 17:53:04,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 17:53:04,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=283, Invalid=647, Unknown=0, NotChecked=0, Total=930 [2018-12-03 17:53:04,079 INFO L87 Difference]: Start difference. First operand 160 states and 173 transitions. Second operand 17 states. [2018-12-03 17:53:04,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:53:04,456 INFO L93 Difference]: Finished difference Result 185 states and 200 transitions. [2018-12-03 17:53:04,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 17:53:04,457 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 159 [2018-12-03 17:53:04,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:53:04,458 INFO L225 Difference]: With dead ends: 185 [2018-12-03 17:53:04,458 INFO L226 Difference]: Without dead ends: 183 [2018-12-03 17:53:04,458 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 301 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=283, Invalid=647, Unknown=0, NotChecked=0, Total=930 [2018-12-03 17:53:04,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-12-03 17:53:04,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 172. [2018-12-03 17:53:04,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 17:53:04,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 186 transitions. [2018-12-03 17:53:04,489 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 186 transitions. Word has length 159 [2018-12-03 17:53:04,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:53:04,489 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 186 transitions. [2018-12-03 17:53:04,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 17:53:04,489 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 186 transitions. [2018-12-03 17:53:04,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 17:53:04,491 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:53:04,491 INFO L402 BasicCegarLoop]: trace histogram [140, 14, 14, 1, 1, 1] [2018-12-03 17:53:04,492 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:53:04,492 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:53:04,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1848396915, now seen corresponding path program 14 times [2018-12-03 17:53:04,492 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:53:04,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:53:04,493 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:53:04,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:53:04,493 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:53:04,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:53:04,927 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 17:53:04,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:53:04,927 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:53:04,928 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:53:04,928 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:53:04,928 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:53:04,928 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 17:53:04,937 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:53:04,937 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 17:59:21,865 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 85 check-sat command(s) [2018-12-03 17:59:21,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:59:27,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:59:28,137 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 17:59:28,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:59:28,696 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 17:59:28,710 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:59:28,710 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2018-12-03 17:59:28,710 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:59:28,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 17:59:28,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 17:59:28,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=738, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 17:59:28,712 INFO L87 Difference]: Start difference. First operand 172 states and 186 transitions. Second operand 18 states. [2018-12-03 17:59:29,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:59:29,095 INFO L93 Difference]: Finished difference Result 197 states and 213 transitions. [2018-12-03 17:59:29,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 17:59:29,096 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 171 [2018-12-03 17:59:29,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:59:29,097 INFO L225 Difference]: With dead ends: 197 [2018-12-03 17:59:29,098 INFO L226 Difference]: Without dead ends: 195 [2018-12-03 17:59:29,098 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 17:59:29,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-12-03 17:59:29,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 184. [2018-12-03 17:59:29,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-12-03 17:59:29,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 199 transitions. [2018-12-03 17:59:29,130 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 199 transitions. Word has length 171 [2018-12-03 17:59:29,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:59:29,131 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 199 transitions. [2018-12-03 17:59:29,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 17:59:29,131 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 199 transitions. [2018-12-03 17:59:29,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-12-03 17:59:29,133 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:59:29,133 INFO L402 BasicCegarLoop]: trace histogram [150, 15, 15, 1, 1, 1] [2018-12-03 17:59:29,133 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:59:29,134 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:59:29,134 INFO L82 PathProgramCache]: Analyzing trace with hash -848721157, now seen corresponding path program 15 times [2018-12-03 17:59:29,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:59:29,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:59:29,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:59:29,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:59:29,135 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:59:29,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:59:29,783 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-12-03 17:59:30,274 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 17:59:30,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:59:30,275 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:59:30,275 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:59:30,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:59:30,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:59:30,275 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 17:59:30,286 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 17:59:30,286 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 17:59:30,394 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 17:59:30,395 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 17:59:30,400 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:59:30,507 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 17:59:30,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:59:31,213 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 17:59:31,235 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:59:31,235 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2018-12-03 17:59:31,235 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:59:31,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 17:59:31,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 17:59:31,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=835, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 17:59:31,237 INFO L87 Difference]: Start difference. First operand 184 states and 199 transitions. Second operand 19 states. [2018-12-03 17:59:31,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:59:31,800 INFO L93 Difference]: Finished difference Result 209 states and 226 transitions. [2018-12-03 17:59:31,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 17:59:31,800 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 183 [2018-12-03 17:59:31,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:59:31,802 INFO L225 Difference]: With dead ends: 209 [2018-12-03 17:59:31,802 INFO L226 Difference]: Without dead ends: 207 [2018-12-03 17:59:31,803 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 347 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=355, Invalid=835, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 17:59:31,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-12-03 17:59:31,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 196. [2018-12-03 17:59:31,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 17:59:31,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 212 transitions. [2018-12-03 17:59:31,843 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 212 transitions. Word has length 183 [2018-12-03 17:59:31,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:59:31,843 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 212 transitions. [2018-12-03 17:59:31,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 17:59:31,843 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 212 transitions. [2018-12-03 17:59:31,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 17:59:31,844 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:59:31,845 INFO L402 BasicCegarLoop]: trace histogram [160, 16, 16, 1, 1, 1] [2018-12-03 17:59:31,845 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:59:31,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:59:31,845 INFO L82 PathProgramCache]: Analyzing trace with hash -1437254269, now seen corresponding path program 16 times [2018-12-03 17:59:31,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:59:31,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:59:31,846 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 17:59:31,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:59:31,847 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:59:31,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:59:32,302 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 17:59:32,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:59:32,303 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:59:32,303 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:59:32,303 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:59:32,303 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:59:32,303 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 17:59:32,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:59:32,313 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 17:59:32,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:59:32,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 17:59:32,644 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 17:59:32,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 17:59:33,378 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 17:59:33,400 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 17:59:33,401 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2018-12-03 17:59:33,401 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 17:59:33,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 17:59:33,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 17:59:33,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=938, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 17:59:33,402 INFO L87 Difference]: Start difference. First operand 196 states and 212 transitions. Second operand 20 states. [2018-12-03 17:59:33,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 17:59:33,882 INFO L93 Difference]: Finished difference Result 221 states and 239 transitions. [2018-12-03 17:59:33,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 17:59:33,882 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2018-12-03 17:59:33,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 17:59:33,883 INFO L225 Difference]: With dead ends: 221 [2018-12-03 17:59:33,884 INFO L226 Difference]: Without dead ends: 219 [2018-12-03 17:59:33,884 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 370 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=394, Invalid=938, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 17:59:33,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-12-03 17:59:33,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 208. [2018-12-03 17:59:33,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2018-12-03 17:59:33,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 225 transitions. [2018-12-03 17:59:33,933 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 225 transitions. Word has length 195 [2018-12-03 17:59:33,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 17:59:33,934 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 225 transitions. [2018-12-03 17:59:33,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 17:59:33,934 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 225 transitions. [2018-12-03 17:59:33,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2018-12-03 17:59:33,935 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 17:59:33,936 INFO L402 BasicCegarLoop]: trace histogram [170, 17, 17, 1, 1, 1] [2018-12-03 17:59:33,936 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 17:59:33,936 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 17:59:33,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1323394059, now seen corresponding path program 17 times [2018-12-03 17:59:33,936 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 17:59:33,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:59:33,938 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 17:59:33,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 17:59:33,938 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 17:59:33,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 17:59:34,883 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 17:59:34,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:59:34,884 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 17:59:34,884 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 17:59:34,884 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 17:59:34,884 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 17:59:34,884 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 17:59:34,896 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 17:59:34,896 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP)