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/toy/tooDifficultLoopInvariant/ArrayInit02.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 18:06:58,061 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 18:06:58,063 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 18:06:58,082 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 18:06:58,082 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 18:06:58,083 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 18:06:58,085 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 18:06:58,087 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 18:06:58,090 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 18:06:58,091 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 18:06:58,092 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 18:06:58,133 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 18:06:58,146 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 18:06:58,146 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 18:06:58,147 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 18:06:58,148 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 18:06:58,148 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 18:06:58,148 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 18:06:58,148 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 18:06:58,149 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 18:06:58,149 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 18:06:58,149 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 18:06:58,149 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 18:06:58,149 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 18:06:58,150 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 18:06:58,150 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 18:06:58,151 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 18:06:58,151 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 18:06:58,151 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 18:06:58,151 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 18:06:58,152 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 18:06:58,152 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 18:06:58,152 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 18:06:58,152 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 18:06:58,152 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 18:06:58,152 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 18:06:58,153 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 18:06:58,154 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 18:06:58,154 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 18:06:58,154 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 18:06:58,154 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 18:06:58,155 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 18:06:58,155 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:06:58,155 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 18:06:58,156 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 18:06:58,156 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 18:06:58,156 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 18:06:58,156 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 18:06:58,156 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 18:06:58,156 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 18:06:58,157 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 18:06:58,205 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 18:06:58,220 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 18:06:58,225 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 18:06:58,226 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 18:06:58,227 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 18:06:58,228 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl [2018-12-03 18:06:58,228 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/ArrayInit02.bpl' [2018-12-03 18:06:58,271 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 18:06:58,275 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 18:06:58,276 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 18:06:58,276 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 18:06:58,276 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 18:06:58,293 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,304 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,315 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 18:06:58,316 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 18:06:58,316 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 18:06:58,316 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 18:06:58,329 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,329 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,330 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,330 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,334 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,340 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,340 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/1) ... [2018-12-03 18:06:58,341 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 18:06:58,342 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 18:06:58,342 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 18:06:58,342 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 18:06:58,343 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (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 18:06:58,402 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2018-12-03 18:06:58,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 18:06:58,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 18:06:58,749 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 18:06:58,749 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 18:06:58,750 INFO L202 PluginConnector]: Adding new model ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:06:58 BoogieIcfgContainer [2018-12-03 18:06:58,750 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 18:06:58,751 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 18:06:58,751 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 18:06:58,755 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 18:06:58,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:06:58" (1/2) ... [2018-12-03 18:06:58,756 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66bb15f3 and model type ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 06:06:58, skipping insertion in model container [2018-12-03 18:06:58,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "ArrayInit02.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:06:58" (2/2) ... [2018-12-03 18:06:58,758 INFO L112 eAbstractionObserver]: Analyzing ICFG ArrayInit02.bpl [2018-12-03 18:06:58,769 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 18:06:58,777 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 18:06:58,795 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 18:06:58,832 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 18:06:58,832 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 18:06:58,833 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 18:06:58,833 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 18:06:58,833 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 18:06:58,833 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 18:06:58,833 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 18:06:58,834 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 18:06:58,850 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states. [2018-12-03 18:06:58,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 18:06:58,858 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:58,859 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 18:06:58,862 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:58,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:58,869 INFO L82 PathProgramCache]: Analyzing trace with hash 900035954, now seen corresponding path program 1 times [2018-12-03 18:06:58,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:58,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:58,929 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:58,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:58,929 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:58,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:59,141 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 18:06:59,144 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:06:59,144 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 18:06:59,144 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:06:59,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 18:06:59,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 18:06:59,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 18:06:59,166 INFO L87 Difference]: Start difference. First operand 12 states. Second operand 4 states. [2018-12-03 18:06:59,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:59,343 INFO L93 Difference]: Finished difference Result 26 states and 34 transitions. [2018-12-03 18:06:59,344 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 18:06:59,345 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-12-03 18:06:59,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:59,357 INFO L225 Difference]: With dead ends: 26 [2018-12-03 18:06:59,357 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 18:06:59,361 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-03 18:06:59,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 18:06:59,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 11. [2018-12-03 18:06:59,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-12-03 18:06:59,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2018-12-03 18:06:59,397 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 6 [2018-12-03 18:06:59,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:59,397 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2018-12-03 18:06:59,397 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 18:06:59,397 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2018-12-03 18:06:59,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 18:06:59,398 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:59,398 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 18:06:59,399 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:59,399 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:59,399 INFO L82 PathProgramCache]: Analyzing trace with hash 429804648, now seen corresponding path program 1 times [2018-12-03 18:06:59,399 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:59,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:59,400 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:59,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:59,401 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:59,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:59,506 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 18:06:59,507 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:06:59,507 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-03 18:06:59,507 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:06:59,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 18:06:59,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 18:06:59,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 18:06:59,510 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 4 states. [2018-12-03 18:06:59,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:59,621 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2018-12-03 18:06:59,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 18:06:59,622 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2018-12-03 18:06:59,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:59,623 INFO L225 Difference]: With dead ends: 25 [2018-12-03 18:06:59,623 INFO L226 Difference]: Without dead ends: 23 [2018-12-03 18:06:59,624 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-12-03 18:06:59,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-12-03 18:06:59,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2018-12-03 18:06:59,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 18:06:59,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 26 transitions. [2018-12-03 18:06:59,629 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 26 transitions. Word has length 9 [2018-12-03 18:06:59,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:59,630 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 26 transitions. [2018-12-03 18:06:59,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 18:06:59,630 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 26 transitions. [2018-12-03 18:06:59,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 18:06:59,631 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:59,631 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 18:06:59,631 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:59,632 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:59,632 INFO L82 PathProgramCache]: Analyzing trace with hash 429806570, now seen corresponding path program 1 times [2018-12-03 18:06:59,632 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:59,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:59,633 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:59,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:59,634 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:59,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:59,700 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-03 18:06:59,701 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:06:59,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 18:06:59,702 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:06:59,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 18:06:59,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 18:06:59,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:06:59,703 INFO L87 Difference]: Start difference. First operand 19 states and 26 transitions. Second operand 3 states. [2018-12-03 18:06:59,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:59,738 INFO L93 Difference]: Finished difference Result 24 states and 31 transitions. [2018-12-03 18:06:59,739 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 18:06:59,739 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2018-12-03 18:06:59,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:59,740 INFO L225 Difference]: With dead ends: 24 [2018-12-03 18:06:59,740 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 18:06:59,740 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 18:06:59,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 18:06:59,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2018-12-03 18:06:59,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 18:06:59,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2018-12-03 18:06:59,744 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2018-12-03 18:06:59,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:59,744 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2018-12-03 18:06:59,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 18:06:59,745 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2018-12-03 18:06:59,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 18:06:59,745 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:59,746 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 18:06:59,746 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:59,746 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:59,746 INFO L82 PathProgramCache]: Analyzing trace with hash -2090155286, now seen corresponding path program 1 times [2018-12-03 18:06:59,747 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:59,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:59,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:59,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:59,748 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:59,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:00,053 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 15 [2018-12-03 18:07:00,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:00,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:00,113 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:00,115 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 10 with the following transitions: [2018-12-03 18:07:00,117 INFO L205 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [26], [27] [2018-12-03 18:07:00,179 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:07:00,180 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:07:00,594 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:07:00,596 INFO L272 AbstractInterpreter]: Visited 9 different actions 46 times. Merged at 8 different actions 36 times. Widened at 1 different actions 3 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 18:07:00,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:00,611 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:07:00,612 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:00,612 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 18:07:00,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:00,623 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:00,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:00,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:00,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:00,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:00,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:00,869 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:00,869 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 6 [2018-12-03 18:07:00,869 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:00,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-12-03 18:07:00,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-12-03 18:07:00,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-12-03 18:07:00,872 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand 7 states. [2018-12-03 18:07:01,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:01,143 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2018-12-03 18:07:01,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 18:07:01,144 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2018-12-03 18:07:01,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:01,145 INFO L225 Difference]: With dead ends: 26 [2018-12-03 18:07:01,145 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:07:01,146 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2018-12-03 18:07:01,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:07:01,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2018-12-03 18:07:01,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-12-03 18:07:01,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2018-12-03 18:07:01,151 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2018-12-03 18:07:01,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:01,151 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2018-12-03 18:07:01,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-12-03 18:07:01,151 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2018-12-03 18:07:01,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 18:07:01,152 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:01,152 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 18:07:01,153 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:01,153 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:01,153 INFO L82 PathProgramCache]: Analyzing trace with hash -368470767, now seen corresponding path program 1 times [2018-12-03 18:07:01,153 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:01,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:01,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:01,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:01,155 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:01,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:01,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:01,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:01,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:01,241 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-12-03 18:07:01,241 INFO L205 CegarAbsIntRunner]: [0], [4], [9], [11], [13], [17], [20], [22], [26], [27], [30], [32] [2018-12-03 18:07:01,244 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:07:01,245 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:07:01,598 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:07:01,599 INFO L272 AbstractInterpreter]: Visited 12 different actions 98 times. Merged at 11 different actions 71 times. Widened at 3 different actions 7 times. Found 17 fixpoints after 5 different actions. Largest state had 0 variables. [2018-12-03 18:07:01,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:01,624 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:07:01,624 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:01,624 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 18:07:01,634 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:01,634 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:01,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:01,644 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:01,744 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:01,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:01,786 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:01,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:01,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2018-12-03 18:07:01,806 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:01,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 18:07:01,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 18:07:01,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-12-03 18:07:01,807 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 8 states. [2018-12-03 18:07:02,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:02,228 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-12-03 18:07:02,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:07:02,229 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2018-12-03 18:07:02,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:02,229 INFO L225 Difference]: With dead ends: 31 [2018-12-03 18:07:02,229 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:07:02,230 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:07:02,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:07:02,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2018-12-03 18:07:02,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-12-03 18:07:02,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2018-12-03 18:07:02,234 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2018-12-03 18:07:02,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:02,235 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2018-12-03 18:07:02,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 18:07:02,235 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2018-12-03 18:07:02,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-12-03 18:07:02,235 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:02,235 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-03 18:07:02,236 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:02,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:02,236 INFO L82 PathProgramCache]: Analyzing trace with hash -256855911, now seen corresponding path program 2 times [2018-12-03 18:07:02,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:02,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:02,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:02,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:02,237 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:02,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:02,567 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:02,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:02,568 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:02,568 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:02,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:02,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:02,569 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 18:07:02,584 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:02,584 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:02,606 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 18:07:02,606 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:02,608 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:02,683 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:02,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:02,720 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:02,740 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:02,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 10 [2018-12-03 18:07:02,741 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:02,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 18:07:02,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 18:07:02,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:07:02,742 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 11 states. [2018-12-03 18:07:03,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:03,009 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2018-12-03 18:07:03,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 18:07:03,010 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-12-03 18:07:03,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:03,011 INFO L225 Difference]: With dead ends: 35 [2018-12-03 18:07:03,011 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 18:07:03,012 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 25 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2018-12-03 18:07:03,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 18:07:03,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 21. [2018-12-03 18:07:03,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 18:07:03,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-12-03 18:07:03,020 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2018-12-03 18:07:03,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:03,020 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-12-03 18:07:03,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 18:07:03,021 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-12-03 18:07:03,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 18:07:03,021 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:03,021 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 18:07:03,022 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:03,022 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:03,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1110643520, now seen corresponding path program 3 times [2018-12-03 18:07:03,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:03,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:03,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:03,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:03,024 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:03,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:03,149 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:03,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:03,150 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:03,150 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:03,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:03,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:03,150 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 18:07:03,165 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:03,165 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:03,172 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:03,172 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:03,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:03,218 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:03,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:03,267 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:03,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:03,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-03 18:07:03,287 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:03,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 18:07:03,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 18:07:03,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:07:03,288 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 11 states. [2018-12-03 18:07:03,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:03,429 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2018-12-03 18:07:03,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 18:07:03,431 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-12-03 18:07:03,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:03,432 INFO L225 Difference]: With dead ends: 45 [2018-12-03 18:07:03,432 INFO L226 Difference]: Without dead ends: 26 [2018-12-03 18:07:03,433 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 31 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:07:03,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-03 18:07:03,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2018-12-03 18:07:03,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 18:07:03,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2018-12-03 18:07:03,439 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 20 [2018-12-03 18:07:03,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:03,439 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2018-12-03 18:07:03,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 18:07:03,439 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2018-12-03 18:07:03,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 18:07:03,440 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:03,440 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1] [2018-12-03 18:07:03,440 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:03,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:03,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1324912968, now seen corresponding path program 4 times [2018-12-03 18:07:03,441 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:03,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:03,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:03,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:03,442 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:03,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:03,672 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:03,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:03,673 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:03,673 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:03,673 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:03,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:03,673 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 18:07:03,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:03,684 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:03,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:03,699 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:03,812 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:03,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:03,857 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:03,885 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:03,885 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 13 [2018-12-03 18:07:03,885 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:03,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:07:03,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:07:03,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:07:03,886 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 14 states. [2018-12-03 18:07:04,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:04,295 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-12-03 18:07:04,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:07:04,295 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 23 [2018-12-03 18:07:04,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:04,297 INFO L225 Difference]: With dead ends: 49 [2018-12-03 18:07:04,297 INFO L226 Difference]: Without dead ends: 39 [2018-12-03 18:07:04,298 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:07:04,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-12-03 18:07:04,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 28. [2018-12-03 18:07:04,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 18:07:04,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2018-12-03 18:07:04,304 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2018-12-03 18:07:04,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:04,304 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2018-12-03 18:07:04,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:07:04,304 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2018-12-03 18:07:04,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 18:07:04,305 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:04,305 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 18:07:04,306 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:04,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:04,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1588570591, now seen corresponding path program 5 times [2018-12-03 18:07:04,307 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:04,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:04,308 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:04,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:04,308 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:04,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:04,524 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:04,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:04,525 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:04,525 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:04,525 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:04,525 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:04,525 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 18:07:04,535 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:04,535 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:04,546 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 18:07:04,546 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:04,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:04,638 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:04,639 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:04,692 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:04,721 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:04,722 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-12-03 18:07:04,722 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:04,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:07:04,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:07:04,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:07:04,723 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 14 states. [2018-12-03 18:07:05,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:05,295 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-12-03 18:07:05,296 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 18:07:05,296 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-03 18:07:05,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:05,297 INFO L225 Difference]: With dead ends: 60 [2018-12-03 18:07:05,297 INFO L226 Difference]: Without dead ends: 33 [2018-12-03 18:07:05,298 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2018-12-03 18:07:05,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-03 18:07:05,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-12-03 18:07:05,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 18:07:05,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2018-12-03 18:07:05,305 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2018-12-03 18:07:05,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:05,305 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2018-12-03 18:07:05,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:07:05,306 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2018-12-03 18:07:05,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 18:07:05,306 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:05,306 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1] [2018-12-03 18:07:05,306 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:05,307 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:05,307 INFO L82 PathProgramCache]: Analyzing trace with hash 366737255, now seen corresponding path program 6 times [2018-12-03 18:07:05,307 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:05,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:05,308 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:05,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:05,308 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:05,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:05,552 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:05,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:05,552 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:05,553 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:05,553 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:05,553 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:05,553 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 18:07:05,562 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:05,562 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:05,584 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:05,584 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:05,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:05,760 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:05,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:05,809 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:05,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:05,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2018-12-03 18:07:05,829 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:05,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 18:07:05,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 18:07:05,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:07:05,831 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 17 states. [2018-12-03 18:07:06,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:06,368 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2018-12-03 18:07:06,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 18:07:06,369 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 30 [2018-12-03 18:07:06,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:06,370 INFO L225 Difference]: With dead ends: 64 [2018-12-03 18:07:06,370 INFO L226 Difference]: Without dead ends: 50 [2018-12-03 18:07:06,371 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=95, Invalid=505, Unknown=0, NotChecked=0, Total=600 [2018-12-03 18:07:06,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-03 18:07:06,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2018-12-03 18:07:06,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-12-03 18:07:06,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2018-12-03 18:07:06,378 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2018-12-03 18:07:06,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:06,378 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2018-12-03 18:07:06,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 18:07:06,379 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2018-12-03 18:07:06,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-12-03 18:07:06,379 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:06,380 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-03 18:07:06,380 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:06,380 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:06,380 INFO L82 PathProgramCache]: Analyzing trace with hash -1079885042, now seen corresponding path program 7 times [2018-12-03 18:07:06,380 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:06,381 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:06,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:06,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:06,382 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:06,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:06,827 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:06,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:06,828 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:06,828 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:06,828 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:06,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:06,828 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 18:07:06,837 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:06,837 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:06,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:06,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:07,021 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:07,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:07,130 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 36 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:07,150 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:07,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-12-03 18:07:07,150 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:07,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 18:07:07,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 18:07:07,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:07:07,152 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 17 states. [2018-12-03 18:07:07,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:07,447 INFO L93 Difference]: Finished difference Result 75 states and 79 transitions. [2018-12-03 18:07:07,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 18:07:07,448 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 34 [2018-12-03 18:07:07,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:07,449 INFO L225 Difference]: With dead ends: 75 [2018-12-03 18:07:07,449 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 18:07:07,451 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 53 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:07:07,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 18:07:07,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2018-12-03 18:07:07,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-03 18:07:07,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-12-03 18:07:07,457 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 34 [2018-12-03 18:07:07,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:07,458 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-12-03 18:07:07,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 18:07:07,458 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-12-03 18:07:07,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-03 18:07:07,459 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:07,459 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1] [2018-12-03 18:07:07,460 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:07,460 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:07,460 INFO L82 PathProgramCache]: Analyzing trace with hash -921359226, now seen corresponding path program 8 times [2018-12-03 18:07:07,460 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:07,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:07,461 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:07,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:07,461 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:07,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:07,744 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 4 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:07,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:07,744 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:07,744 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:07,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:07,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:07,745 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 18:07:07,754 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:07,755 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:07,768 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 18:07:07,769 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:07,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:08,278 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:08,281 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:08,996 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 28 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:09,015 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:09,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 33 [2018-12-03 18:07:09,015 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:09,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 18:07:09,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 18:07:09,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=961, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:07:09,018 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 27 states. [2018-12-03 18:07:11,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:11,062 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2018-12-03 18:07:11,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 18:07:11,063 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 37 [2018-12-03 18:07:11,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:11,064 INFO L225 Difference]: With dead ends: 97 [2018-12-03 18:07:11,064 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 18:07:11,067 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 47 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=499, Invalid=3533, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 18:07:11,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 18:07:11,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 45. [2018-12-03 18:07:11,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 18:07:11,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2018-12-03 18:07:11,074 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 37 [2018-12-03 18:07:11,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:11,074 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2018-12-03 18:07:11,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 18:07:11,075 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2018-12-03 18:07:11,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 18:07:11,076 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:11,076 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1] [2018-12-03 18:07:11,076 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:11,076 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:11,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1868574667, now seen corresponding path program 9 times [2018-12-03 18:07:11,077 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:11,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:11,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:11,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:11,078 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:11,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:11,487 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:11,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:11,487 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:11,488 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:11,488 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:11,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:11,488 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 18:07:11,497 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:11,497 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:11,511 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:11,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:11,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:11,785 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:11,785 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:11,825 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 5 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:11,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:11,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 22 [2018-12-03 18:07:11,845 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:11,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 18:07:11,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 18:07:11,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=448, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:07:11,846 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 23 states. [2018-12-03 18:07:13,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:13,577 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2018-12-03 18:07:13,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 18:07:13,578 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-12-03 18:07:13,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:13,579 INFO L225 Difference]: With dead ends: 94 [2018-12-03 18:07:13,580 INFO L226 Difference]: Without dead ends: 72 [2018-12-03 18:07:13,581 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:07:13,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-03 18:07:13,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 49. [2018-12-03 18:07:13,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 18:07:13,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2018-12-03 18:07:13,590 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2018-12-03 18:07:13,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:13,590 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2018-12-03 18:07:13,590 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 18:07:13,591 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2018-12-03 18:07:13,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 18:07:13,591 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:13,592 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-03 18:07:13,592 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:13,592 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:13,592 INFO L82 PathProgramCache]: Analyzing trace with hash 269550812, now seen corresponding path program 10 times [2018-12-03 18:07:13,592 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:13,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:13,593 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:13,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:13,594 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:13,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:13,742 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:13,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:13,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:13,743 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:13,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:13,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:13,743 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 18:07:13,752 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:13,752 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:13,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:13,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:13,986 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:13,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:14,127 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:14,149 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:14,149 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-12-03 18:07:14,149 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:14,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 18:07:14,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 18:07:14,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:07:14,150 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 23 states. [2018-12-03 18:07:14,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:14,463 INFO L93 Difference]: Finished difference Result 105 states and 109 transitions. [2018-12-03 18:07:14,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 18:07:14,464 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2018-12-03 18:07:14,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:14,465 INFO L225 Difference]: With dead ends: 105 [2018-12-03 18:07:14,465 INFO L226 Difference]: Without dead ends: 54 [2018-12-03 18:07:14,467 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 75 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2018-12-03 18:07:14,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-03 18:07:14,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2018-12-03 18:07:14,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 18:07:14,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2018-12-03 18:07:14,479 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 48 [2018-12-03 18:07:14,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:14,480 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2018-12-03 18:07:14,480 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 18:07:14,480 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2018-12-03 18:07:14,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 18:07:14,481 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:14,481 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1] [2018-12-03 18:07:14,481 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:14,482 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:14,482 INFO L82 PathProgramCache]: Analyzing trace with hash 2089942100, now seen corresponding path program 11 times [2018-12-03 18:07:14,482 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:14,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:14,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:14,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:14,483 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:14,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:14,926 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:14,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:14,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:14,926 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:14,927 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:14,927 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:14,927 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 18:07:14,937 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:14,938 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:14,953 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 18:07:14,953 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:14,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:15,227 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:15,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:15,278 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 6 proven. 142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:15,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:15,297 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 25 [2018-12-03 18:07:15,298 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:15,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:07:15,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:07:15,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=584, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:07:15,300 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 26 states. [2018-12-03 18:07:16,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:16,721 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2018-12-03 18:07:16,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 18:07:16,722 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 51 [2018-12-03 18:07:16,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:16,723 INFO L225 Difference]: With dead ends: 109 [2018-12-03 18:07:16,723 INFO L226 Difference]: Without dead ends: 83 [2018-12-03 18:07:16,725 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 248 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 18:07:16,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-12-03 18:07:16,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 56. [2018-12-03 18:07:16,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-12-03 18:07:16,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-12-03 18:07:16,738 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2018-12-03 18:07:16,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:16,738 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-12-03 18:07:16,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:07:16,739 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-12-03 18:07:16,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-03 18:07:16,739 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:16,739 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-03 18:07:16,740 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:16,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:16,740 INFO L82 PathProgramCache]: Analyzing trace with hash 549587323, now seen corresponding path program 12 times [2018-12-03 18:07:16,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:16,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:16,741 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:16,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:16,741 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:16,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:16,978 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:16,978 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:16,978 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:16,979 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:16,979 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:16,979 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:16,979 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 18:07:16,989 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:16,989 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:16,999 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:16,999 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:17,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:17,313 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:17,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:17,568 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 105 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:17,588 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:17,588 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-12-03 18:07:17,588 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:17,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:07:17,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:07:17,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:07:17,589 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 26 states. [2018-12-03 18:07:17,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:17,904 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2018-12-03 18:07:17,904 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 18:07:17,904 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 55 [2018-12-03 18:07:17,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:17,905 INFO L225 Difference]: With dead ends: 120 [2018-12-03 18:07:17,905 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 18:07:17,906 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 86 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=293, Invalid=829, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:07:17,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 18:07:17,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-12-03 18:07:17,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-12-03 18:07:17,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2018-12-03 18:07:17,917 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2018-12-03 18:07:17,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:17,917 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2018-12-03 18:07:17,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:07:17,917 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2018-12-03 18:07:17,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-12-03 18:07:17,918 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:17,918 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1] [2018-12-03 18:07:17,919 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:17,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:17,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1743111421, now seen corresponding path program 13 times [2018-12-03 18:07:17,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:17,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:17,920 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:17,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:17,920 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:17,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:18,417 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:18,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:18,418 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:18,418 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:18,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:18,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:18,418 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 18:07:18,429 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:18,429 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:18,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:18,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:18,738 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:18,739 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:18,857 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 7 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:18,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:18,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 28 [2018-12-03 18:07:18,878 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:18,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 18:07:18,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 18:07:18,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=738, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:07:18,880 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 29 states. [2018-12-03 18:07:20,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:20,386 INFO L93 Difference]: Finished difference Result 124 states and 129 transitions. [2018-12-03 18:07:20,391 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 18:07:20,391 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 58 [2018-12-03 18:07:20,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:20,392 INFO L225 Difference]: With dead ends: 124 [2018-12-03 18:07:20,392 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 18:07:20,393 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=211, Invalid=1769, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 18:07:20,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 18:07:20,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 63. [2018-12-03 18:07:20,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 18:07:20,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2018-12-03 18:07:20,411 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 58 [2018-12-03 18:07:20,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:20,412 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2018-12-03 18:07:20,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 18:07:20,412 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2018-12-03 18:07:20,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 18:07:20,414 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:20,414 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-03 18:07:20,414 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:20,414 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:20,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1415751510, now seen corresponding path program 14 times [2018-12-03 18:07:20,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:20,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:20,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:20,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:20,416 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:20,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:21,273 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:21,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:21,274 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:21,274 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:21,274 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:21,274 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:21,274 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 18:07:21,283 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:21,283 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:21,298 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 18:07:21,298 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:21,301 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:21,538 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:21,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:21,675 INFO L134 CoverageAnalysis]: Checked inductivity of 228 backedges. 136 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:21,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:21,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-12-03 18:07:21,695 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:21,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 18:07:21,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 18:07:21,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:07:21,696 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 29 states. [2018-12-03 18:07:22,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:22,238 INFO L93 Difference]: Finished difference Result 135 states and 139 transitions. [2018-12-03 18:07:22,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 18:07:22,239 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2018-12-03 18:07:22,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:22,240 INFO L225 Difference]: With dead ends: 135 [2018-12-03 18:07:22,240 INFO L226 Difference]: Without dead ends: 68 [2018-12-03 18:07:22,241 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 97 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=361, Invalid=1045, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:07:22,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-03 18:07:22,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2018-12-03 18:07:22,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 18:07:22,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2018-12-03 18:07:22,250 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2018-12-03 18:07:22,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:22,251 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2018-12-03 18:07:22,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 18:07:22,251 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2018-12-03 18:07:22,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 18:07:22,252 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:22,252 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1] [2018-12-03 18:07:22,252 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:22,252 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:22,252 INFO L82 PathProgramCache]: Analyzing trace with hash 175889954, now seen corresponding path program 15 times [2018-12-03 18:07:22,252 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:22,253 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:22,253 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:22,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:22,254 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:22,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:22,856 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:22,857 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:22,857 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:22,857 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:22,857 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:22,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:22,858 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 18:07:22,867 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:22,867 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:22,891 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:22,891 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:22,894 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:23,305 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:23,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:23,369 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 8 proven. 245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:23,397 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:23,398 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 31 [2018-12-03 18:07:23,398 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:23,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:07:23,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:07:23,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=910, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:07:23,400 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2018-12-03 18:07:25,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:25,273 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2018-12-03 18:07:25,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 18:07:25,273 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2018-12-03 18:07:25,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:25,274 INFO L225 Difference]: With dead ends: 139 [2018-12-03 18:07:25,274 INFO L226 Difference]: Without dead ends: 105 [2018-12-03 18:07:25,276 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 116 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=245, Invalid=2205, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:07:25,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-12-03 18:07:25,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 70. [2018-12-03 18:07:25,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 18:07:25,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2018-12-03 18:07:25,284 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2018-12-03 18:07:25,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:25,284 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2018-12-03 18:07:25,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:07:25,285 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2018-12-03 18:07:25,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 18:07:25,285 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:25,285 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-03 18:07:25,286 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:25,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:25,286 INFO L82 PathProgramCache]: Analyzing trace with hash 2774089, now seen corresponding path program 16 times [2018-12-03 18:07:25,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:25,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:25,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:25,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:25,287 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:25,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:25,772 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:25,772 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:25,772 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:25,772 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:25,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:25,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:25,773 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 18:07:25,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:25,783 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:25,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:25,798 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:26,308 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:26,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:26,458 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 171 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:26,477 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:26,477 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-12-03 18:07:26,477 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:26,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:07:26,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:07:26,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:07:26,478 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 32 states. [2018-12-03 18:07:26,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:26,866 INFO L93 Difference]: Finished difference Result 150 states and 154 transitions. [2018-12-03 18:07:26,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 18:07:26,867 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 69 [2018-12-03 18:07:26,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:26,868 INFO L225 Difference]: With dead ends: 150 [2018-12-03 18:07:26,868 INFO L226 Difference]: Without dead ends: 75 [2018-12-03 18:07:26,870 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 108 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=436, Invalid=1286, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 18:07:26,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-12-03 18:07:26,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2018-12-03 18:07:26,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 18:07:26,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2018-12-03 18:07:26,879 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2018-12-03 18:07:26,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:26,879 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2018-12-03 18:07:26,879 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:07:26,879 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2018-12-03 18:07:26,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 18:07:26,880 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:26,880 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1] [2018-12-03 18:07:26,880 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:26,880 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:26,880 INFO L82 PathProgramCache]: Analyzing trace with hash 2036938705, now seen corresponding path program 17 times [2018-12-03 18:07:26,880 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:26,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:26,881 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:26,881 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:26,881 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:26,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:27,334 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 9 proven. 307 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:27,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:27,335 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:27,335 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:27,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:27,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:27,335 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:27,344 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:27,345 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:27,370 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-03 18:07:27,370 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:27,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:28,534 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 162 proven. 154 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:28,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:29,311 INFO L134 CoverageAnalysis]: Checked inductivity of 316 backedges. 153 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:29,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:29,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 58 [2018-12-03 18:07:29,330 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:29,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:07:29,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:07:29,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=3001, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:07:29,333 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 47 states. [2018-12-03 18:07:31,860 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2018-12-03 18:07:33,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:33,936 INFO L93 Difference]: Finished difference Result 192 states and 198 transitions. [2018-12-03 18:07:33,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 18:07:33,943 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 72 [2018-12-03 18:07:33,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:33,944 INFO L225 Difference]: With dead ends: 192 [2018-12-03 18:07:33,944 INFO L226 Difference]: Without dead ends: 113 [2018-12-03 18:07:33,948 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 97 SyntacticMatches, 11 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3015 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=1319, Invalid=12723, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:07:33,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2018-12-03 18:07:33,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 80. [2018-12-03 18:07:33,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-03 18:07:33,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2018-12-03 18:07:33,959 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 72 [2018-12-03 18:07:33,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:33,960 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2018-12-03 18:07:33,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:07:33,960 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2018-12-03 18:07:33,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-03 18:07:33,961 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:33,961 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1] [2018-12-03 18:07:33,961 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:33,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:33,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1070649840, now seen corresponding path program 18 times [2018-12-03 18:07:33,962 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:33,962 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:33,962 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:33,963 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:33,963 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:33,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:34,423 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:34,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:34,424 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:34,424 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:34,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:34,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:34,424 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:34,438 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:34,438 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:34,453 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:34,453 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:34,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:35,023 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:35,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:35,079 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 10 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:35,099 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:35,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 37 [2018-12-03 18:07:35,100 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:35,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:07:35,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:07:35,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1308, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:07:35,101 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 38 states. [2018-12-03 18:07:37,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:37,424 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2018-12-03 18:07:37,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 18:07:37,428 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 79 [2018-12-03 18:07:37,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:37,429 INFO L225 Difference]: With dead ends: 169 [2018-12-03 18:07:37,429 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 18:07:37,430 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 560 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=319, Invalid=3221, Unknown=0, NotChecked=0, Total=3540 [2018-12-03 18:07:37,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 18:07:37,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 84. [2018-12-03 18:07:37,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 18:07:37,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2018-12-03 18:07:37,439 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 79 [2018-12-03 18:07:37,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:37,440 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2018-12-03 18:07:37,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:07:37,440 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2018-12-03 18:07:37,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 18:07:37,441 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:37,441 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-03 18:07:37,441 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:37,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:37,442 INFO L82 PathProgramCache]: Analyzing trace with hash -685461225, now seen corresponding path program 19 times [2018-12-03 18:07:37,442 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:37,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:37,443 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:37,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:37,443 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:37,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:38,025 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:38,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:38,026 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:38,026 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:38,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:38,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:38,026 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:38,036 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:38,037 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:38,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:38,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:38,324 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:38,324 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:38,528 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 253 proven. 176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:38,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:38,547 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-12-03 18:07:38,547 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:38,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:07:38,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:07:38,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:07:38,548 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2018-12-03 18:07:39,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:39,076 INFO L93 Difference]: Finished difference Result 180 states and 184 transitions. [2018-12-03 18:07:39,076 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 18:07:39,076 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2018-12-03 18:07:39,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:39,077 INFO L225 Difference]: With dead ends: 180 [2018-12-03 18:07:39,078 INFO L226 Difference]: Without dead ends: 89 [2018-12-03 18:07:39,080 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 130 SyntacticMatches, 23 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=607, Invalid=1843, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:07:39,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-12-03 18:07:39,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2018-12-03 18:07:39,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 18:07:39,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2018-12-03 18:07:39,090 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2018-12-03 18:07:39,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:39,090 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2018-12-03 18:07:39,090 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:07:39,090 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2018-12-03 18:07:39,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 18:07:39,091 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:39,091 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1] [2018-12-03 18:07:39,091 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:39,092 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:39,092 INFO L82 PathProgramCache]: Analyzing trace with hash -1750415713, now seen corresponding path program 20 times [2018-12-03 18:07:39,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:39,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:39,093 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:39,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:39,093 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:39,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:39,614 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 11 proven. 452 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:39,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:39,615 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:39,615 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:39,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:39,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:39,615 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:39,625 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:39,625 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:39,652 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-03 18:07:39,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:39,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:40,736 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 242 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:40,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:41,699 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 231 proven. 232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:41,718 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:41,718 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 68 [2018-12-03 18:07:41,718 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:41,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 18:07:41,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 18:07:41,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=560, Invalid=4132, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 18:07:41,721 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 55 states. [2018-12-03 18:07:48,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:48,221 INFO L93 Difference]: Finished difference Result 230 states and 236 transitions. [2018-12-03 18:07:48,221 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 18:07:48,221 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 86 [2018-12-03 18:07:48,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:48,223 INFO L225 Difference]: With dead ends: 230 [2018-12-03 18:07:48,223 INFO L226 Difference]: Without dead ends: 135 [2018-12-03 18:07:48,229 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 117 SyntacticMatches, 13 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4250 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=1745, Invalid=17995, Unknown=0, NotChecked=0, Total=19740 [2018-12-03 18:07:48,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2018-12-03 18:07:48,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 94. [2018-12-03 18:07:48,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 18:07:48,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2018-12-03 18:07:48,243 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 86 [2018-12-03 18:07:48,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:48,243 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2018-12-03 18:07:48,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 18:07:48,243 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2018-12-03 18:07:48,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 18:07:48,244 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:48,244 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1] [2018-12-03 18:07:48,244 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:48,244 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:48,245 INFO L82 PathProgramCache]: Analyzing trace with hash 2005850046, now seen corresponding path program 21 times [2018-12-03 18:07:48,245 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:48,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:48,245 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:48,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:48,246 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:48,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:49,057 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:49,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:49,058 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:49,058 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:49,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:49,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:49,058 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:49,068 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:49,068 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:49,083 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:49,084 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:49,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:49,617 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:49,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:49,719 INFO L134 CoverageAnalysis]: Checked inductivity of 547 backedges. 12 proven. 535 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:49,738 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:49,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 43 [2018-12-03 18:07:49,739 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:49,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:07:49,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:07:49,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1778, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:07:49,740 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand 44 states. [2018-12-03 18:07:53,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:53,288 INFO L93 Difference]: Finished difference Result 199 states and 204 transitions. [2018-12-03 18:07:53,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 18:07:53,289 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 93 [2018-12-03 18:07:53,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:53,290 INFO L225 Difference]: With dead ends: 199 [2018-12-03 18:07:53,290 INFO L226 Difference]: Without dead ends: 149 [2018-12-03 18:07:53,291 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 168 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=401, Invalid=4429, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 18:07:53,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-12-03 18:07:53,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 98. [2018-12-03 18:07:53,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-12-03 18:07:53,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 100 transitions. [2018-12-03 18:07:53,304 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 100 transitions. Word has length 93 [2018-12-03 18:07:53,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:53,305 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 100 transitions. [2018-12-03 18:07:53,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:07:53,305 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 100 transitions. [2018-12-03 18:07:53,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-03 18:07:53,305 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:53,305 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-03 18:07:53,306 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:53,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:53,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1370431461, now seen corresponding path program 22 times [2018-12-03 18:07:53,306 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:53,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:53,307 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:53,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:53,307 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:53,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:53,634 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:53,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:53,634 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:53,634 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:53,634 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:53,634 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:53,634 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:53,643 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:53,643 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:53,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:53,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:54,013 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:54,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:55,451 INFO L134 CoverageAnalysis]: Checked inductivity of 598 backedges. 351 proven. 247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:55,470 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:55,471 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2018-12-03 18:07:55,471 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:55,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:07:55,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:07:55,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:07:55,472 INFO L87 Difference]: Start difference. First operand 98 states and 100 transitions. Second operand 44 states. [2018-12-03 18:07:56,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:56,138 INFO L93 Difference]: Finished difference Result 210 states and 214 transitions. [2018-12-03 18:07:56,138 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 18:07:56,138 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 97 [2018-12-03 18:07:56,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:56,140 INFO L225 Difference]: With dead ends: 210 [2018-12-03 18:07:56,140 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 18:07:56,141 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 152 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=806, Invalid=2500, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 18:07:56,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 18:07:56,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 101. [2018-12-03 18:07:56,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-12-03 18:07:56,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2018-12-03 18:07:56,158 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2018-12-03 18:07:56,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:56,158 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2018-12-03 18:07:56,158 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:07:56,158 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2018-12-03 18:07:56,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-12-03 18:07:56,159 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:56,159 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1] [2018-12-03 18:07:56,159 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:56,159 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:56,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1811736429, now seen corresponding path program 23 times [2018-12-03 18:07:56,159 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:56,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:56,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:56,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:56,161 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:56,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:56,835 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:56,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:56,836 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:56,836 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:56,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:56,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:56,836 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:56,845 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:56,845 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:56,872 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 18:07:56,872 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:56,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:57,553 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:57,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:57,635 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 13 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:57,665 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:57,665 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 46 [2018-12-03 18:07:57,665 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:57,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:07:57,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:07:57,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2040, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:07:57,667 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand 47 states. [2018-12-03 18:08:01,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:01,334 INFO L93 Difference]: Finished difference Result 214 states and 219 transitions. [2018-12-03 18:08:01,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 18:08:01,335 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 100 [2018-12-03 18:08:01,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:01,336 INFO L225 Difference]: With dead ends: 214 [2018-12-03 18:08:01,336 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 18:08:01,337 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 181 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 878 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=445, Invalid=5105, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 18:08:01,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 18:08:01,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 105. [2018-12-03 18:08:01,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-03 18:08:01,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2018-12-03 18:08:01,352 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 100 [2018-12-03 18:08:01,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:01,353 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2018-12-03 18:08:01,353 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:08:01,353 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2018-12-03 18:08:01,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-03 18:08:01,353 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:01,353 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-03 18:08:01,354 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:01,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:01,354 INFO L82 PathProgramCache]: Analyzing trace with hash 1008713748, now seen corresponding path program 24 times [2018-12-03 18:08:01,354 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:01,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:01,355 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:01,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:01,355 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:01,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:01,811 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:01,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:01,812 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:01,812 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:01,812 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:01,812 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:01,812 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:01,820 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:08:01,821 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:08:01,838 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:08:01,838 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:01,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:02,234 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:02,234 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:02,512 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 406 proven. 287 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:02,531 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:02,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 46 [2018-12-03 18:08:02,532 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:02,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:08:02,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:08:02,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:08:02,533 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand 47 states. [2018-12-03 18:08:03,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:03,150 INFO L93 Difference]: Finished difference Result 225 states and 229 transitions. [2018-12-03 18:08:03,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 18:08:03,150 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 104 [2018-12-03 18:08:03,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:03,151 INFO L225 Difference]: With dead ends: 225 [2018-12-03 18:08:03,151 INFO L226 Difference]: Without dead ends: 110 [2018-12-03 18:08:03,152 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 163 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=916, Invalid=2866, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:08:03,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-12-03 18:08:03,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 108. [2018-12-03 18:08:03,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 18:08:03,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2018-12-03 18:08:03,166 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2018-12-03 18:08:03,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:03,167 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2018-12-03 18:08:03,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:08:03,167 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2018-12-03 18:08:03,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 18:08:03,167 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:03,168 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1] [2018-12-03 18:08:03,168 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:03,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:03,168 INFO L82 PathProgramCache]: Analyzing trace with hash -1699483764, now seen corresponding path program 25 times [2018-12-03 18:08:03,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:03,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:03,169 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:03,169 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:03,169 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:03,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:03,983 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:03,983 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:03,983 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:03,983 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:03,984 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:03,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:03,984 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:04,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:04,001 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:08:04,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:04,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:04,712 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:04,712 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:04,822 INFO L134 CoverageAnalysis]: Checked inductivity of 736 backedges. 14 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:04,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:04,843 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 49 [2018-12-03 18:08:04,843 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:04,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:08:04,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:08:04,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2320, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:08:04,845 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand 50 states. [2018-12-03 18:08:09,699 WARN L180 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2018-12-03 18:08:10,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:10,019 INFO L93 Difference]: Finished difference Result 229 states and 234 transitions. [2018-12-03 18:08:10,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 18:08:10,020 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 107 [2018-12-03 18:08:10,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:10,021 INFO L225 Difference]: With dead ends: 229 [2018-12-03 18:08:10,021 INFO L226 Difference]: Without dead ends: 171 [2018-12-03 18:08:10,023 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 194 SyntacticMatches, 3 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=491, Invalid=5829, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:08:10,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-12-03 18:08:10,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 112. [2018-12-03 18:08:10,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 18:08:10,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2018-12-03 18:08:10,044 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 107 [2018-12-03 18:08:10,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:10,045 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2018-12-03 18:08:10,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:08:10,045 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2018-12-03 18:08:10,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 18:08:10,046 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:10,046 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-03 18:08:10,046 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:10,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:10,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1446534989, now seen corresponding path program 26 times [2018-12-03 18:08:10,047 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:10,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:10,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:10,048 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:10,048 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:10,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:10,463 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:10,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:10,464 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:10,464 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:10,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:10,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:10,464 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:10,474 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:08:10,474 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:08:10,501 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 18:08:10,502 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:10,504 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:10,953 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:10,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:11,293 INFO L134 CoverageAnalysis]: Checked inductivity of 795 backedges. 465 proven. 330 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:11,313 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:11,313 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 49 [2018-12-03 18:08:11,313 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:11,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:08:11,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:08:11,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:08:11,314 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand 50 states. [2018-12-03 18:08:11,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:11,860 INFO L93 Difference]: Finished difference Result 240 states and 244 transitions. [2018-12-03 18:08:11,861 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 18:08:11,861 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 111 [2018-12-03 18:08:11,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:11,862 INFO L225 Difference]: With dead ends: 240 [2018-12-03 18:08:11,862 INFO L226 Difference]: Without dead ends: 117 [2018-12-03 18:08:11,863 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 174 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1033, Invalid=3257, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 18:08:11,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-12-03 18:08:11,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2018-12-03 18:08:11,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-03 18:08:11,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2018-12-03 18:08:11,882 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 111 [2018-12-03 18:08:11,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:11,882 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2018-12-03 18:08:11,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:08:11,882 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2018-12-03 18:08:11,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-03 18:08:11,882 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:11,882 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1] [2018-12-03 18:08:11,883 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:11,883 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:11,883 INFO L82 PathProgramCache]: Analyzing trace with hash -2055366085, now seen corresponding path program 27 times [2018-12-03 18:08:11,883 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:11,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:11,884 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:11,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:11,884 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:11,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:13,281 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:13,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:13,282 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:13,282 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:13,282 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:13,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:13,282 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:13,302 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:08:13,302 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:08:13,333 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:08:13,333 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:13,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:14,378 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:14,379 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:14,466 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 15 proven. 826 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:14,485 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:14,485 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 52 [2018-12-03 18:08:14,485 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:14,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 18:08:14,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 18:08:14,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2618, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:08:14,487 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand 53 states. [2018-12-03 18:08:19,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:19,710 INFO L93 Difference]: Finished difference Result 244 states and 249 transitions. [2018-12-03 18:08:19,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 18:08:19,716 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 114 [2018-12-03 18:08:19,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:19,717 INFO L225 Difference]: With dead ends: 244 [2018-12-03 18:08:19,717 INFO L226 Difference]: Without dead ends: 182 [2018-12-03 18:08:19,718 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 207 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=539, Invalid=6601, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 18:08:19,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-12-03 18:08:19,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 119. [2018-12-03 18:08:19,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-12-03 18:08:19,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2018-12-03 18:08:19,743 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 114 [2018-12-03 18:08:19,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:19,743 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2018-12-03 18:08:19,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 18:08:19,743 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2018-12-03 18:08:19,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-12-03 18:08:19,744 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:19,744 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-03 18:08:19,744 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:19,744 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:19,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1833851874, now seen corresponding path program 28 times [2018-12-03 18:08:19,745 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:19,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:19,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:19,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:19,747 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:19,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:20,285 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:20,285 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:20,285 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:20,285 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:20,286 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:20,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:20,286 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:20,296 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:20,297 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:08:20,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:20,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:20,835 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:20,835 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:21,277 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 528 proven. 376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:21,297 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:21,297 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-12-03 18:08:21,297 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:21,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 18:08:21,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 18:08:21,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:08:21,298 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand 53 states. [2018-12-03 18:08:22,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:22,238 INFO L93 Difference]: Finished difference Result 255 states and 259 transitions. [2018-12-03 18:08:22,238 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 18:08:22,238 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 118 [2018-12-03 18:08:22,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:22,239 INFO L225 Difference]: With dead ends: 255 [2018-12-03 18:08:22,240 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 18:08:22,241 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 185 SyntacticMatches, 33 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1157, Invalid=3673, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 18:08:22,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 18:08:22,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 122. [2018-12-03 18:08:22,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-03 18:08:22,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2018-12-03 18:08:22,260 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 118 [2018-12-03 18:08:22,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:22,260 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2018-12-03 18:08:22,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 18:08:22,261 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2018-12-03 18:08:22,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-03 18:08:22,261 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:22,261 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1] [2018-12-03 18:08:22,261 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:22,262 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:22,262 INFO L82 PathProgramCache]: Analyzing trace with hash 540940634, now seen corresponding path program 29 times [2018-12-03 18:08:22,262 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:22,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:22,263 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:22,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:22,263 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:22,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:23,273 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 16 proven. 937 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:23,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:23,273 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:23,273 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:23,273 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:23,273 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:23,274 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:23,283 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:08:23,283 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:08:23,314 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 18:08:23,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:23,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:25,592 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 512 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:25,593 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:27,370 INFO L134 CoverageAnalysis]: Checked inductivity of 953 backedges. 496 proven. 457 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:27,389 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:27,389 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 38, 38] total 93 [2018-12-03 18:08:27,389 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:27,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-12-03 18:08:27,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-12-03 18:08:27,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=7747, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 18:08:27,391 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand 75 states. [2018-12-03 18:08:36,222 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2018-12-03 18:08:37,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:37,928 INFO L93 Difference]: Finished difference Result 325 states and 331 transitions. [2018-12-03 18:08:37,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 18:08:37,929 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 121 [2018-12-03 18:08:37,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:37,931 INFO L225 Difference]: With dead ends: 325 [2018-12-03 18:08:37,931 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 18:08:37,933 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 167 SyntacticMatches, 18 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8265 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=3055, Invalid=35165, Unknown=0, NotChecked=0, Total=38220 [2018-12-03 18:08:37,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 18:08:37,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 129. [2018-12-03 18:08:37,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-03 18:08:37,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2018-12-03 18:08:37,956 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 121 [2018-12-03 18:08:37,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:37,956 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2018-12-03 18:08:37,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-12-03 18:08:37,956 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2018-12-03 18:08:37,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-03 18:08:37,957 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:37,957 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1] [2018-12-03 18:08:37,957 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:37,958 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:37,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1991581943, now seen corresponding path program 30 times [2018-12-03 18:08:37,958 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:37,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:37,959 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:37,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:37,959 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:37,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:39,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:39,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:39,901 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:39,901 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:39,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:39,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:39,901 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:39,911 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:08:39,911 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:08:39,931 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:08:39,931 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:39,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:40,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:40,820 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:40,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1072 backedges. 17 proven. 1055 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:40,959 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:40,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 58 [2018-12-03 18:08:40,960 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:40,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:08:40,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:08:40,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=3268, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:08:40,961 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand 59 states. [2018-12-03 18:08:44,625 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2018-12-03 18:08:46,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:46,680 INFO L93 Difference]: Finished difference Result 274 states and 279 transitions. [2018-12-03 18:08:46,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 18:08:46,680 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 128 [2018-12-03 18:08:46,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:46,681 INFO L225 Difference]: With dead ends: 274 [2018-12-03 18:08:46,681 INFO L226 Difference]: Without dead ends: 204 [2018-12-03 18:08:46,682 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=641, Invalid=8289, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:08:46,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2018-12-03 18:08:46,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 133. [2018-12-03 18:08:46,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-03 18:08:46,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2018-12-03 18:08:46,706 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 128 [2018-12-03 18:08:46,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:46,707 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2018-12-03 18:08:46,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:08:46,707 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2018-12-03 18:08:46,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-03 18:08:46,707 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:46,707 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-03 18:08:46,708 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:46,708 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:46,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1942976080, now seen corresponding path program 31 times [2018-12-03 18:08:46,708 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:46,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:46,709 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:46,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:46,709 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:46,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:47,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:47,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:47,322 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:47,323 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:47,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:47,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:47,323 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:47,339 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:47,340 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:08:47,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:47,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:48,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:48,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:48,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1143 backedges. 666 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:48,486 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:48,486 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 58 [2018-12-03 18:08:48,487 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:48,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:08:48,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:08:48,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:08:48,488 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand 59 states. [2018-12-03 18:08:49,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:49,508 INFO L93 Difference]: Finished difference Result 285 states and 289 transitions. [2018-12-03 18:08:49,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 18:08:49,509 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 132 [2018-12-03 18:08:49,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:49,510 INFO L225 Difference]: With dead ends: 285 [2018-12-03 18:08:49,511 INFO L226 Difference]: Without dead ends: 138 [2018-12-03 18:08:49,512 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 207 SyntacticMatches, 37 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1426, Invalid=4580, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 18:08:49,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-12-03 18:08:49,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2018-12-03 18:08:49,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 18:08:49,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2018-12-03 18:08:49,537 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 132 [2018-12-03 18:08:49,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:49,537 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2018-12-03 18:08:49,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:08:49,537 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2018-12-03 18:08:49,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 18:08:49,538 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:49,538 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1] [2018-12-03 18:08:49,538 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:49,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:49,539 INFO L82 PathProgramCache]: Analyzing trace with hash 220943656, now seen corresponding path program 32 times [2018-12-03 18:08:49,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:49,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:49,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:49,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:49,540 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:49,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:50,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 18 proven. 1180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:50,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:50,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:50,683 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:50,683 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:50,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:50,683 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:50,706 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:08:50,706 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:08:50,743 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-03 18:08:50,743 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:50,746 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:53,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 648 proven. 550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:53,184 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:55,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 630 proven. 568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:55,618 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:55,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 103 [2018-12-03 18:08:55,618 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:55,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 18:08:55,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 18:08:55,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1204, Invalid=9508, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:08:55,620 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand 83 states. [2018-12-03 18:09:06,470 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-03 18:09:06,768 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-03 18:09:09,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:09,366 INFO L93 Difference]: Finished difference Result 363 states and 369 transitions. [2018-12-03 18:09:09,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2018-12-03 18:09:09,366 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 135 [2018-12-03 18:09:09,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:09,368 INFO L225 Difference]: With dead ends: 363 [2018-12-03 18:09:09,368 INFO L226 Difference]: Without dead ends: 212 [2018-12-03 18:09:09,371 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 187 SyntacticMatches, 20 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10242 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=3677, Invalid=43629, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:09:09,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2018-12-03 18:09:09,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 143. [2018-12-03 18:09:09,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2018-12-03 18:09:09,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2018-12-03 18:09:09,398 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 135 [2018-12-03 18:09:09,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:09,398 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2018-12-03 18:09:09,399 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 18:09:09,399 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2018-12-03 18:09:09,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2018-12-03 18:09:09,399 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:09,399 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1] [2018-12-03 18:09:09,399 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:09,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:09,400 INFO L82 PathProgramCache]: Analyzing trace with hash 847427031, now seen corresponding path program 33 times [2018-12-03 18:09:09,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:09,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:09,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:09,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:09,401 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:09,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:11,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:11,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:11,035 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:11,035 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:11,035 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:11,035 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:11,035 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:11,043 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:09:11,044 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:09:11,080 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:09:11,080 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:11,084 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:12,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:12,208 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:12,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1331 backedges. 19 proven. 1312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:12,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:12,351 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 64 [2018-12-03 18:09:12,352 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:12,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 18:09:12,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 18:09:12,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3990, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:09:12,353 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand 65 states. [2018-12-03 18:09:16,682 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 18:09:16,960 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 18:09:17,220 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2018-12-03 18:09:19,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:19,118 INFO L93 Difference]: Finished difference Result 304 states and 309 transitions. [2018-12-03 18:09:19,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 18:09:19,118 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 142 [2018-12-03 18:09:19,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:19,120 INFO L225 Difference]: With dead ends: 304 [2018-12-03 18:09:19,120 INFO L226 Difference]: Without dead ends: 226 [2018-12-03 18:09:19,121 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 259 SyntacticMatches, 3 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1730 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=751, Invalid=10169, Unknown=0, NotChecked=0, Total=10920 [2018-12-03 18:09:19,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-12-03 18:09:19,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 147. [2018-12-03 18:09:19,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 18:09:19,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2018-12-03 18:09:19,156 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 142 [2018-12-03 18:09:19,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:19,156 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2018-12-03 18:09:19,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 18:09:19,157 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2018-12-03 18:09:19,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-03 18:09:19,157 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:19,158 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-03 18:09:19,158 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:19,158 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:19,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1796978306, now seen corresponding path program 34 times [2018-12-03 18:09:19,158 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:19,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:19,159 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:19,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:19,159 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:19,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:20,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:20,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:20,801 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:20,801 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:20,801 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:20,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:20,801 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:20,812 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:20,812 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:09:20,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:20,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:21,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:21,652 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:22,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1410 backedges. 820 proven. 590 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:22,201 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:22,201 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 64 [2018-12-03 18:09:22,201 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:22,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 18:09:22,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 18:09:22,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:09:22,203 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand 65 states. [2018-12-03 18:09:23,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:23,565 INFO L93 Difference]: Finished difference Result 315 states and 319 transitions. [2018-12-03 18:09:23,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 18:09:23,565 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 146 [2018-12-03 18:09:23,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:23,567 INFO L225 Difference]: With dead ends: 315 [2018-12-03 18:09:23,567 INFO L226 Difference]: Without dead ends: 152 [2018-12-03 18:09:23,568 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 229 SyntacticMatches, 41 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1723, Invalid=5587, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:09:23,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-12-03 18:09:23,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 150. [2018-12-03 18:09:23,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 18:09:23,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2018-12-03 18:09:23,595 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 146 [2018-12-03 18:09:23,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:23,596 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2018-12-03 18:09:23,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 18:09:23,596 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2018-12-03 18:09:23,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 18:09:23,597 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:23,597 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1] [2018-12-03 18:09:23,597 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:23,597 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:23,597 INFO L82 PathProgramCache]: Analyzing trace with hash -193355018, now seen corresponding path program 35 times [2018-12-03 18:09:23,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:23,598 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:23,598 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:23,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:23,599 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:23,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:24,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 20 proven. 1451 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:24,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:24,845 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:24,846 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:24,846 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:24,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:24,846 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:24,856 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:09:24,856 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:09:25,144 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-03 18:09:25,144 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:25,148 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:28,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 800 proven. 671 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:28,240 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:31,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1471 backedges. 780 proven. 691 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:31,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:31,087 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 46, 46] total 113 [2018-12-03 18:09:31,087 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:31,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2018-12-03 18:09:31,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2018-12-03 18:09:31,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=11449, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 18:09:31,089 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand 91 states. [2018-12-03 18:09:42,953 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 18:09:43,264 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 18:09:43,581 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2018-12-03 18:09:43,852 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:09:46,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:46,646 INFO L93 Difference]: Finished difference Result 401 states and 407 transitions. [2018-12-03 18:09:46,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2018-12-03 18:09:46,646 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 149 [2018-12-03 18:09:46,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:46,648 INFO L225 Difference]: With dead ends: 401 [2018-12-03 18:09:46,648 INFO L226 Difference]: Without dead ends: 234 [2018-12-03 18:09:46,650 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 207 SyntacticMatches, 22 SemanticMatches, 238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12431 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=4355, Invalid=53005, Unknown=0, NotChecked=0, Total=57360 [2018-12-03 18:09:46,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-12-03 18:09:46,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 157. [2018-12-03 18:09:46,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-03 18:09:46,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2018-12-03 18:09:46,678 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 149 [2018-12-03 18:09:46,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:46,678 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2018-12-03 18:09:46,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 91 states. [2018-12-03 18:09:46,678 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2018-12-03 18:09:46,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 18:09:46,679 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:46,679 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1] [2018-12-03 18:09:46,679 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:46,680 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:46,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1380130469, now seen corresponding path program 36 times [2018-12-03 18:09:46,680 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:46,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:46,681 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:46,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:46,681 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:46,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:48,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:48,949 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:48,950 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:48,950 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:48,950 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:48,950 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:48,950 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:48,978 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:09:48,978 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:09:49,005 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:09:49,005 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:49,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:51,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:51,182 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:51,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1618 backedges. 21 proven. 1597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:51,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:51,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 70 [2018-12-03 18:09:51,337 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:51,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 18:09:51,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 18:09:51,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4784, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:09:51,338 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand 71 states. [2018-12-03 18:09:57,127 WARN L180 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 18:09:57,446 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 18:09:57,750 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 108 [2018-12-03 18:09:57,948 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:09:58,137 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:10:00,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:00,175 INFO L93 Difference]: Finished difference Result 334 states and 339 transitions. [2018-12-03 18:10:00,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 18:10:00,175 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 156 [2018-12-03 18:10:00,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:00,177 INFO L225 Difference]: With dead ends: 334 [2018-12-03 18:10:00,177 INFO L226 Difference]: Without dead ends: 248 [2018-12-03 18:10:00,178 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 285 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2078 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=869, Invalid=12241, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 18:10:00,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-12-03 18:10:00,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 161. [2018-12-03 18:10:00,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2018-12-03 18:10:00,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2018-12-03 18:10:00,209 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 156 [2018-12-03 18:10:00,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:00,209 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2018-12-03 18:10:00,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 18:10:00,209 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2018-12-03 18:10:00,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-12-03 18:10:00,210 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:00,210 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-03 18:10:00,210 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:00,211 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:00,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1719166132, now seen corresponding path program 37 times [2018-12-03 18:10:00,211 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:00,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:00,212 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:00,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:00,212 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:00,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:01,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:01,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:01,158 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:01,158 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:01,158 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:01,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:01,158 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:01,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:01,168 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:01,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:01,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:02,112 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:02,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:02,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1705 backedges. 990 proven. 715 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:02,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:02,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 70 [2018-12-03 18:10:02,782 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:02,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 18:10:02,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 18:10:02,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:10:02,783 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand 71 states. [2018-12-03 18:10:04,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:04,408 INFO L93 Difference]: Finished difference Result 345 states and 349 transitions. [2018-12-03 18:10:04,410 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 18:10:04,410 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 160 [2018-12-03 18:10:04,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:04,411 INFO L225 Difference]: With dead ends: 345 [2018-12-03 18:10:04,411 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 18:10:04,412 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 251 SyntacticMatches, 45 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2992 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2048, Invalid=6694, Unknown=0, NotChecked=0, Total=8742 [2018-12-03 18:10:04,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 18:10:04,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 164. [2018-12-03 18:10:04,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-12-03 18:10:04,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2018-12-03 18:10:04,441 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 160 [2018-12-03 18:10:04,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:04,442 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2018-12-03 18:10:04,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 18:10:04,442 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2018-12-03 18:10:04,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-03 18:10:04,442 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:04,442 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1] [2018-12-03 18:10:04,443 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:04,443 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:04,443 INFO L82 PathProgramCache]: Analyzing trace with hash -148438332, now seen corresponding path program 38 times [2018-12-03 18:10:04,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:04,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:04,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:04,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:04,444 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:04,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:06,372 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:06,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:06,373 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:06,373 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:06,373 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:06,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:06,373 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:06,383 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:06,383 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:06,468 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:10:06,469 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:06,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:07,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:07,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:08,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1772 backedges. 22 proven. 1750 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:08,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:08,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 73 [2018-12-03 18:10:08,024 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:08,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 18:10:08,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 18:10:08,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=5208, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:10:08,025 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand 74 states. [2018-12-03 18:10:15,025 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 18:10:15,364 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 18:10:15,683 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2018-12-03 18:10:15,897 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:10:16,099 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:10:16,296 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:10:16,507 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 18:10:16,699 WARN L180 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2018-12-03 18:10:18,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:18,458 INFO L93 Difference]: Finished difference Result 349 states and 354 transitions. [2018-12-03 18:10:18,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 18:10:18,459 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 163 [2018-12-03 18:10:18,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:18,461 INFO L225 Difference]: With dead ends: 349 [2018-12-03 18:10:18,461 INFO L226 Difference]: Without dead ends: 259 [2018-12-03 18:10:18,462 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 298 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=931, Invalid=13349, Unknown=0, NotChecked=0, Total=14280 [2018-12-03 18:10:18,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-12-03 18:10:18,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 168. [2018-12-03 18:10:18,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 18:10:18,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 170 transitions. [2018-12-03 18:10:18,500 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 170 transitions. Word has length 163 [2018-12-03 18:10:18,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:18,500 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 170 transitions. [2018-12-03 18:10:18,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 18:10:18,500 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 170 transitions. [2018-12-03 18:10:18,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 18:10:18,501 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:18,501 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-03 18:10:18,501 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:18,501 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:18,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1550952469, now seen corresponding path program 39 times [2018-12-03 18:10:18,501 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:18,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:18,502 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:18,502 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:18,502 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:18,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:19,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:19,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:19,713 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:19,713 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:19,713 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:19,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:19,713 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:19,722 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:19,722 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:19,747 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:19,747 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:19,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:20,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:20,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:21,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1863 backedges. 1081 proven. 782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:21,477 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:21,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 73 [2018-12-03 18:10:21,478 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:21,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 18:10:21,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 18:10:21,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:10:21,480 INFO L87 Difference]: Start difference. First operand 168 states and 170 transitions. Second operand 74 states. [2018-12-03 18:10:23,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:23,344 INFO L93 Difference]: Finished difference Result 360 states and 364 transitions. [2018-12-03 18:10:23,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 18:10:23,345 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 167 [2018-12-03 18:10:23,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:23,346 INFO L225 Difference]: With dead ends: 360 [2018-12-03 18:10:23,346 INFO L226 Difference]: Without dead ends: 173 [2018-12-03 18:10:23,347 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 262 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2221, Invalid=7285, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:10:23,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2018-12-03 18:10:23,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 171. [2018-12-03 18:10:23,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-03 18:10:23,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2018-12-03 18:10:23,380 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 167 [2018-12-03 18:10:23,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:23,380 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2018-12-03 18:10:23,380 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 18:10:23,380 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2018-12-03 18:10:23,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 18:10:23,381 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:23,381 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1] [2018-12-03 18:10:23,381 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:23,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:23,382 INFO L82 PathProgramCache]: Analyzing trace with hash -810935949, now seen corresponding path program 40 times [2018-12-03 18:10:23,382 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:23,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:23,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:23,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:23,382 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:23,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:24,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:24,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:24,955 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:24,955 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:24,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:24,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:24,955 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:24,964 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:24,964 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:24,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:25,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:26,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:26,946 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:27,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1933 backedges. 23 proven. 1910 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:27,136 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:27,136 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 76 [2018-12-03 18:10:27,136 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:27,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 18:10:27,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 18:10:27,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=5650, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:10:27,138 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand 77 states. [2018-12-03 18:10:34,632 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 18:10:34,988 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 18:10:35,334 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2018-12-03 18:10:35,565 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:10:35,794 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:10:36,007 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:10:36,212 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:10:38,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:38,436 INFO L93 Difference]: Finished difference Result 364 states and 369 transitions. [2018-12-03 18:10:38,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 18:10:38,436 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 170 [2018-12-03 18:10:38,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:38,437 INFO L225 Difference]: With dead ends: 364 [2018-12-03 18:10:38,437 INFO L226 Difference]: Without dead ends: 270 [2018-12-03 18:10:38,438 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 311 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2458 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=995, Invalid=14505, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 18:10:38,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2018-12-03 18:10:38,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 175. [2018-12-03 18:10:38,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 18:10:38,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 177 transitions. [2018-12-03 18:10:38,470 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 177 transitions. Word has length 170 [2018-12-03 18:10:38,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:38,470 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 177 transitions. [2018-12-03 18:10:38,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 18:10:38,470 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 177 transitions. [2018-12-03 18:10:38,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 18:10:38,471 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:38,471 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-03 18:10:38,471 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:38,471 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:38,471 INFO L82 PathProgramCache]: Analyzing trace with hash -1036484838, now seen corresponding path program 41 times [2018-12-03 18:10:38,472 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:38,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:38,472 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:38,472 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:38,473 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:38,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:39,560 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:39,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:39,561 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:39,561 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:39,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:39,561 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:39,562 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:39,577 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:39,577 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:39,687 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 18:10:39,688 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:39,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:40,997 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:40,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:41,759 INFO L134 CoverageAnalysis]: Checked inductivity of 2028 backedges. 1176 proven. 852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:41,779 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:41,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2018-12-03 18:10:41,779 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:41,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 18:10:41,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 18:10:41,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:10:41,780 INFO L87 Difference]: Start difference. First operand 175 states and 177 transitions. Second operand 77 states. [2018-12-03 18:10:43,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:43,888 INFO L93 Difference]: Finished difference Result 375 states and 379 transitions. [2018-12-03 18:10:43,889 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 18:10:43,889 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 174 [2018-12-03 18:10:43,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:43,890 INFO L225 Difference]: With dead ends: 375 [2018-12-03 18:10:43,890 INFO L226 Difference]: Without dead ends: 180 [2018-12-03 18:10:43,892 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 273 SyntacticMatches, 49 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2401, Invalid=7901, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 18:10:43,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-03 18:10:43,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2018-12-03 18:10:43,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 18:10:43,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2018-12-03 18:10:43,926 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 174 [2018-12-03 18:10:43,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:43,927 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2018-12-03 18:10:43,927 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 18:10:43,927 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2018-12-03 18:10:43,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 18:10:43,928 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:43,928 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1] [2018-12-03 18:10:43,928 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:43,928 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:43,928 INFO L82 PathProgramCache]: Analyzing trace with hash -1003391854, now seen corresponding path program 42 times [2018-12-03 18:10:43,928 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:43,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:43,929 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:43,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:43,929 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:43,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:45,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:45,984 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:45,984 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:45,984 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:45,985 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:45,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:45,985 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:45,996 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:45,997 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:46,033 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:46,033 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:46,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:48,030 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:48,031 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:48,195 INFO L134 CoverageAnalysis]: Checked inductivity of 2101 backedges. 24 proven. 2077 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:48,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:48,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 79 [2018-12-03 18:10:48,215 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:48,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 18:10:48,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 18:10:48,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=6110, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:10:48,217 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand 80 states. [2018-12-03 18:10:54,654 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 18:10:55,019 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 18:10:55,383 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 123 [2018-12-03 18:10:55,627 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:10:55,871 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:10:56,097 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:10:56,321 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:10:56,531 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:10:57,324 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2018-12-03 18:10:58,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:58,897 INFO L93 Difference]: Finished difference Result 379 states and 384 transitions. [2018-12-03 18:10:58,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-03 18:10:58,897 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 177 [2018-12-03 18:10:58,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:58,899 INFO L225 Difference]: With dead ends: 379 [2018-12-03 18:10:58,899 INFO L226 Difference]: Without dead ends: 281 [2018-12-03 18:10:58,901 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 324 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2660 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=1061, Invalid=15709, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 18:10:58,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2018-12-03 18:10:58,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 182. [2018-12-03 18:10:58,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-12-03 18:10:58,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 184 transitions. [2018-12-03 18:10:58,952 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 184 transitions. Word has length 177 [2018-12-03 18:10:58,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:58,953 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 184 transitions. [2018-12-03 18:10:58,953 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 18:10:58,953 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 184 transitions. [2018-12-03 18:10:58,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-12-03 18:10:58,954 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:58,954 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-03 18:10:58,954 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:58,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:58,955 INFO L82 PathProgramCache]: Analyzing trace with hash 525284025, now seen corresponding path program 43 times [2018-12-03 18:10:58,955 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:58,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:58,956 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:58,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:58,956 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:58,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:59,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:59,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:59,958 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:59,958 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:59,958 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:59,958 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:59,958 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:59,969 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:59,969 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:00,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:00,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:01,130 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:01,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:01,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2200 backedges. 1275 proven. 925 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:01,964 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:01,964 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 79 [2018-12-03 18:11:01,964 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:01,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 18:11:01,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 18:11:01,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:11:01,965 INFO L87 Difference]: Start difference. First operand 182 states and 184 transitions. Second operand 80 states. [2018-12-03 18:11:04,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:04,143 INFO L93 Difference]: Finished difference Result 390 states and 394 transitions. [2018-12-03 18:11:04,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 18:11:04,144 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 181 [2018-12-03 18:11:04,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:04,145 INFO L225 Difference]: With dead ends: 390 [2018-12-03 18:11:04,145 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 18:11:04,147 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 284 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2588, Invalid=8542, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 18:11:04,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 18:11:04,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 185. [2018-12-03 18:11:04,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2018-12-03 18:11:04,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2018-12-03 18:11:04,185 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 181 [2018-12-03 18:11:04,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:04,185 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2018-12-03 18:11:04,185 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 18:11:04,185 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2018-12-03 18:11:04,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-12-03 18:11:04,186 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:04,186 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1] [2018-12-03 18:11:04,186 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:04,186 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:04,186 INFO L82 PathProgramCache]: Analyzing trace with hash -1479170495, now seen corresponding path program 44 times [2018-12-03 18:11:04,186 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:04,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:04,187 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:04,187 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:04,187 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:04,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:06,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 25 proven. 2251 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:06,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:06,059 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:06,059 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:06,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:06,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:06,059 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:06,069 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:06,069 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:06,197 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 18:11:06,197 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:06,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:10,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 1250 proven. 1026 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:10,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:14,986 INFO L134 CoverageAnalysis]: Checked inductivity of 2276 backedges. 1225 proven. 1051 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:15,005 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:15,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 56, 56] total 138 [2018-12-03 18:11:15,006 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:15,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 111 states [2018-12-03 18:11:15,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2018-12-03 18:11:15,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2093, Invalid=17089, Unknown=0, NotChecked=0, Total=19182 [2018-12-03 18:11:15,007 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand 111 states. [2018-12-03 18:11:33,028 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 18:11:33,533 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 18:11:34,005 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 128 [2018-12-03 18:11:34,404 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:11:34,772 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:11:35,132 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:11:35,483 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:11:35,806 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:11:36,124 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:11:39,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:39,440 INFO L93 Difference]: Finished difference Result 496 states and 502 transitions. [2018-12-03 18:11:39,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 184 states. [2018-12-03 18:11:39,441 INFO L78 Accepts]: Start accepts. Automaton has 111 states. Word has length 184 [2018-12-03 18:11:39,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:39,443 INFO L225 Difference]: With dead ends: 496 [2018-12-03 18:11:39,443 INFO L226 Difference]: Without dead ends: 289 [2018-12-03 18:11:39,447 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 577 GetRequests, 257 SyntacticMatches, 27 SemanticMatches, 293 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18831 ImplicationChecksByTransitivity, 28.3s TimeCoverageRelationStatistics Valid=6295, Invalid=80435, Unknown=0, NotChecked=0, Total=86730 [2018-12-03 18:11:39,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-12-03 18:11:39,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 192. [2018-12-03 18:11:39,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-03 18:11:39,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 194 transitions. [2018-12-03 18:11:39,488 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 194 transitions. Word has length 184 [2018-12-03 18:11:39,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:39,488 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 194 transitions. [2018-12-03 18:11:39,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has 111 states. [2018-12-03 18:11:39,488 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 194 transitions. [2018-12-03 18:11:39,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-03 18:11:39,489 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:39,489 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1] [2018-12-03 18:11:39,489 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:39,489 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:39,490 INFO L82 PathProgramCache]: Analyzing trace with hash -1734936480, now seen corresponding path program 45 times [2018-12-03 18:11:39,490 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:39,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:39,490 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:39,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:39,490 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:39,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:41,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:41,346 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:41,346 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:41,346 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:41,346 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:41,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:41,347 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:41,356 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:41,356 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:41,387 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:41,387 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:41,391 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:43,301 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:43,302 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:43,844 INFO L134 CoverageAnalysis]: Checked inductivity of 2458 backedges. 26 proven. 2432 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:43,863 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:43,864 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 85 [2018-12-03 18:11:43,864 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:43,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 18:11:43,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 18:11:43,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=7084, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:11:43,865 INFO L87 Difference]: Start difference. First operand 192 states and 194 transitions. Second operand 86 states. [2018-12-03 18:11:52,334 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 18:11:52,763 WARN L180 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 18:11:53,156 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 133 [2018-12-03 18:11:53,431 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:11:53,728 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:11:54,015 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:11:54,262 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:11:54,497 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:11:54,727 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:11:54,955 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:11:57,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:57,322 INFO L93 Difference]: Finished difference Result 409 states and 414 transitions. [2018-12-03 18:11:57,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 18:11:57,323 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 191 [2018-12-03 18:11:57,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:57,325 INFO L225 Difference]: With dead ends: 409 [2018-12-03 18:11:57,325 INFO L226 Difference]: Without dead ends: 303 [2018-12-03 18:11:57,327 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 350 SyntacticMatches, 3 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3088 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=1199, Invalid=18261, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 18:11:57,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2018-12-03 18:11:57,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 196. [2018-12-03 18:11:57,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 18:11:57,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2018-12-03 18:11:57,370 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2018-12-03 18:11:57,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:57,370 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2018-12-03 18:11:57,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 18:11:57,370 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2018-12-03 18:11:57,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 18:11:57,371 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:57,371 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-03 18:11:57,371 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:57,371 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:57,371 INFO L82 PathProgramCache]: Analyzing trace with hash 2056396679, now seen corresponding path program 46 times [2018-12-03 18:11:57,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:57,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:57,372 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:57,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:57,372 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:57,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:58,426 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:58,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:58,426 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:58,426 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:58,426 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:58,426 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:58,426 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:58,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:58,435 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:58,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:58,475 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:02,091 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:02,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:03,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2565 backedges. 1485 proven. 1080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:03,069 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:03,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 85 [2018-12-03 18:12:03,070 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:03,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 18:12:03,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 18:12:03,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:12:03,071 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand 86 states. [2018-12-03 18:12:05,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:05,590 INFO L93 Difference]: Finished difference Result 420 states and 424 transitions. [2018-12-03 18:12:05,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 18:12:05,595 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 195 [2018-12-03 18:12:05,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:05,596 INFO L225 Difference]: With dead ends: 420 [2018-12-03 18:12:05,596 INFO L226 Difference]: Without dead ends: 201 [2018-12-03 18:12:05,597 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 306 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=2983, Invalid=9899, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 18:12:05,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2018-12-03 18:12:05,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 199. [2018-12-03 18:12:05,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-12-03 18:12:05,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 201 transitions. [2018-12-03 18:12:05,643 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 201 transitions. Word has length 195 [2018-12-03 18:12:05,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:05,643 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 201 transitions. [2018-12-03 18:12:05,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 18:12:05,643 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 201 transitions. [2018-12-03 18:12:05,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2018-12-03 18:12:05,644 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:05,644 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1] [2018-12-03 18:12:05,645 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:05,645 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:05,645 INFO L82 PathProgramCache]: Analyzing trace with hash -303839985, now seen corresponding path program 47 times [2018-12-03 18:12:05,645 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:05,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:05,646 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:05,646 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:05,646 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:05,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:07,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:07,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:07,564 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:07,564 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:07,565 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:07,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:07,565 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:07,574 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:07,574 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:07,632 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-03 18:12:07,633 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:07,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:09,821 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:09,821 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:10,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2647 backedges. 27 proven. 2620 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:10,038 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:10,038 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 88 [2018-12-03 18:12:10,038 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:10,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 18:12:10,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 18:12:10,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=7598, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:12:10,039 INFO L87 Difference]: Start difference. First operand 199 states and 201 transitions. Second operand 89 states. [2018-12-03 18:12:18,581 WARN L180 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 18:12:19,035 WARN L180 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 18:12:19,525 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2018-12-03 18:12:19,827 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:12:20,113 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:12:20,387 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:12:20,656 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:12:20,915 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:12:21,174 WARN L180 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:12:21,408 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:12:21,633 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:12:24,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:24,066 INFO L93 Difference]: Finished difference Result 424 states and 429 transitions. [2018-12-03 18:12:24,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-03 18:12:24,066 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 198 [2018-12-03 18:12:24,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:24,068 INFO L225 Difference]: With dead ends: 424 [2018-12-03 18:12:24,068 INFO L226 Difference]: Without dead ends: 314 [2018-12-03 18:12:24,070 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 363 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3314 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=1271, Invalid=19609, Unknown=0, NotChecked=0, Total=20880 [2018-12-03 18:12:24,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2018-12-03 18:12:24,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 203. [2018-12-03 18:12:24,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 203 states. [2018-12-03 18:12:24,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2018-12-03 18:12:24,117 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 198 [2018-12-03 18:12:24,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:24,117 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2018-12-03 18:12:24,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 18:12:24,118 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2018-12-03 18:12:24,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-12-03 18:12:24,119 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:24,119 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-03 18:12:24,119 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:24,119 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:24,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1908736842, now seen corresponding path program 48 times [2018-12-03 18:12:24,119 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:24,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:24,120 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:24,120 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:24,120 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:24,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:25,661 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:25,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:25,662 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:25,662 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:25,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:25,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:25,662 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:25,671 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:12:25,671 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:12:25,705 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:12:25,705 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:25,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:27,104 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:27,104 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:28,158 INFO L134 CoverageAnalysis]: Checked inductivity of 2758 backedges. 1596 proven. 1162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:28,179 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:28,179 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 88 [2018-12-03 18:12:28,179 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:28,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 18:12:28,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 18:12:28,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:12:28,180 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand 89 states. [2018-12-03 18:12:30,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:30,866 INFO L93 Difference]: Finished difference Result 435 states and 439 transitions. [2018-12-03 18:12:30,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 18:12:30,867 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 202 [2018-12-03 18:12:30,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:30,869 INFO L225 Difference]: With dead ends: 435 [2018-12-03 18:12:30,869 INFO L226 Difference]: Without dead ends: 208 [2018-12-03 18:12:30,870 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 317 SyntacticMatches, 57 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4816 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3191, Invalid=10615, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 18:12:30,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2018-12-03 18:12:30,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 206. [2018-12-03 18:12:30,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-12-03 18:12:30,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 208 transitions. [2018-12-03 18:12:30,926 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 208 transitions. Word has length 202 [2018-12-03 18:12:30,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:30,926 INFO L480 AbstractCegarLoop]: Abstraction has 206 states and 208 transitions. [2018-12-03 18:12:30,926 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 18:12:30,926 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 208 transitions. [2018-12-03 18:12:30,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-12-03 18:12:30,927 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:30,928 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1] [2018-12-03 18:12:30,928 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:30,928 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:30,928 INFO L82 PathProgramCache]: Analyzing trace with hash 1062571566, now seen corresponding path program 49 times [2018-12-03 18:12:30,928 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:30,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:30,929 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:30,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:30,929 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:30,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:32,945 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:32,945 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:32,946 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:32,946 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:32,946 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:32,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:32,946 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:32,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:32,958 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:12:32,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:33,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:35,418 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:35,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:35,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2843 backedges. 28 proven. 2815 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:35,642 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:35,643 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 91 [2018-12-03 18:12:35,643 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:35,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 18:12:35,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 18:12:35,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=8130, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:12:35,644 INFO L87 Difference]: Start difference. First operand 206 states and 208 transitions. Second operand 92 states. [2018-12-03 18:12:44,797 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 18:12:45,389 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 18:12:45,824 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 143 [2018-12-03 18:12:46,124 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:12:46,426 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:12:46,716 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:12:46,992 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:12:47,266 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:12:47,546 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:12:47,796 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:12:48,037 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:12:48,263 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:12:50,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:50,890 INFO L93 Difference]: Finished difference Result 439 states and 444 transitions. [2018-12-03 18:12:50,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-03 18:12:50,890 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 205 [2018-12-03 18:12:50,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:50,892 INFO L225 Difference]: With dead ends: 439 [2018-12-03 18:12:50,892 INFO L226 Difference]: Without dead ends: 325 [2018-12-03 18:12:50,893 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3548 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=1345, Invalid=21005, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 18:12:50,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2018-12-03 18:12:50,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 210. [2018-12-03 18:12:50,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-12-03 18:12:50,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 212 transitions. [2018-12-03 18:12:50,952 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 212 transitions. Word has length 205 [2018-12-03 18:12:50,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:50,952 INFO L480 AbstractCegarLoop]: Abstraction has 210 states and 212 transitions. [2018-12-03 18:12:50,953 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 18:12:50,953 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 212 transitions. [2018-12-03 18:12:50,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-12-03 18:12:50,954 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:50,954 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-03 18:12:50,954 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:50,954 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:50,955 INFO L82 PathProgramCache]: Analyzing trace with hash -782950827, now seen corresponding path program 50 times [2018-12-03 18:12:50,955 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:50,955 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:50,956 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:50,956 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:50,956 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:50,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:52,989 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:52,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:52,989 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:52,990 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:52,990 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:52,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:52,990 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:53,005 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:53,005 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:53,068 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 18:12:53,068 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:53,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:54,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:54,597 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:55,983 INFO L134 CoverageAnalysis]: Checked inductivity of 2958 backedges. 1711 proven. 1247 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:56,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:56,003 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 91 [2018-12-03 18:12:56,003 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:56,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 18:12:56,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 18:12:56,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:12:56,004 INFO L87 Difference]: Start difference. First operand 210 states and 212 transitions. Second operand 92 states. [2018-12-03 18:12:58,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:58,716 INFO L93 Difference]: Finished difference Result 450 states and 454 transitions. [2018-12-03 18:12:58,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 18:12:58,716 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 209 [2018-12-03 18:12:58,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:58,718 INFO L225 Difference]: With dead ends: 450 [2018-12-03 18:12:58,719 INFO L226 Difference]: Without dead ends: 215 [2018-12-03 18:12:58,720 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 328 SyntacticMatches, 59 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5162 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3406, Invalid=11356, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:12:58,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-12-03 18:12:58,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 213. [2018-12-03 18:12:58,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2018-12-03 18:12:58,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2018-12-03 18:12:58,774 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 209 [2018-12-03 18:12:58,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:58,774 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2018-12-03 18:12:58,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 18:12:58,775 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2018-12-03 18:12:58,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2018-12-03 18:12:58,776 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:58,776 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1] [2018-12-03 18:12:58,776 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:58,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:58,777 INFO L82 PathProgramCache]: Analyzing trace with hash -890079779, now seen corresponding path program 51 times [2018-12-03 18:12:58,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:58,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:58,777 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:58,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:58,778 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:58,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:01,104 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:01,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:01,104 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:01,104 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:01,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:01,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:01,105 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:01,116 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:13:01,116 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:13:01,159 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:13:01,159 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:01,166 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:03,840 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:03,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:04,111 INFO L134 CoverageAnalysis]: Checked inductivity of 3046 backedges. 29 proven. 3017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:04,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:04,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 94 [2018-12-03 18:13:04,130 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:04,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 18:13:04,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 18:13:04,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=8680, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:13:04,132 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand 95 states. [2018-12-03 18:13:14,499 WARN L180 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 18:13:14,960 WARN L180 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 18:13:15,407 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2018-12-03 18:13:15,754 WARN L180 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:13:16,080 WARN L180 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:13:16,384 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:13:16,680 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:13:16,969 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:13:17,261 WARN L180 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:13:17,532 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:13:17,792 WARN L180 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:13:18,034 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:13:18,271 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:13:20,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:20,985 INFO L93 Difference]: Finished difference Result 454 states and 459 transitions. [2018-12-03 18:13:20,985 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-03 18:13:20,985 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 212 [2018-12-03 18:13:20,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:20,987 INFO L225 Difference]: With dead ends: 454 [2018-12-03 18:13:20,987 INFO L226 Difference]: Without dead ends: 336 [2018-12-03 18:13:20,989 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 389 SyntacticMatches, 3 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3790 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=1421, Invalid=22449, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 18:13:20,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2018-12-03 18:13:21,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 217. [2018-12-03 18:13:21,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-12-03 18:13:21,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2018-12-03 18:13:21,046 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 212 [2018-12-03 18:13:21,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:21,047 INFO L480 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2018-12-03 18:13:21,047 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 18:13:21,047 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2018-12-03 18:13:21,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-12-03 18:13:21,047 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:21,048 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-03 18:13:21,048 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:21,048 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:21,048 INFO L82 PathProgramCache]: Analyzing trace with hash -272066940, now seen corresponding path program 52 times [2018-12-03 18:13:21,048 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:21,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:21,049 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:21,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:21,049 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:21,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:22,360 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:22,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:22,360 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:22,360 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:22,361 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:22,361 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:22,361 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:22,369 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:22,370 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:13:22,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:22,415 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:23,980 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:23,981 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:25,150 INFO L134 CoverageAnalysis]: Checked inductivity of 3165 backedges. 1830 proven. 1335 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:25,170 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:25,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2018-12-03 18:13:25,170 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:25,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 18:13:25,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 18:13:25,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:13:25,171 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand 95 states. [2018-12-03 18:13:28,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:28,171 INFO L93 Difference]: Finished difference Result 465 states and 469 transitions. [2018-12-03 18:13:28,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 18:13:28,171 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 216 [2018-12-03 18:13:28,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:28,172 INFO L225 Difference]: With dead ends: 465 [2018-12-03 18:13:28,173 INFO L226 Difference]: Without dead ends: 222 [2018-12-03 18:13:28,173 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 339 SyntacticMatches, 61 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3628, Invalid=12122, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 18:13:28,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-12-03 18:13:28,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 220. [2018-12-03 18:13:28,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2018-12-03 18:13:28,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 222 transitions. [2018-12-03 18:13:28,227 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 222 transitions. Word has length 216 [2018-12-03 18:13:28,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:28,228 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 222 transitions. [2018-12-03 18:13:28,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 18:13:28,228 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 222 transitions. [2018-12-03 18:13:28,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2018-12-03 18:13:28,228 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:28,229 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1] [2018-12-03 18:13:28,229 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:28,229 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:28,229 INFO L82 PathProgramCache]: Analyzing trace with hash 292238844, now seen corresponding path program 53 times [2018-12-03 18:13:28,229 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:28,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:28,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:28,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:28,230 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:28,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:30,492 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 30 proven. 3226 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:30,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:30,493 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:30,493 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:30,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:30,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:30,493 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:30,502 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:13:30,503 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:13:30,570 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-03 18:13:30,570 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:30,575 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:36,960 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 1800 proven. 1456 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:36,960 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:42,694 INFO L134 CoverageAnalysis]: Checked inductivity of 3256 backedges. 1770 proven. 1486 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:42,713 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:42,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 66, 66] total 163 [2018-12-03 18:13:42,714 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:42,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-03 18:13:42,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-03 18:13:42,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2878, Invalid=23854, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:13:42,716 INFO L87 Difference]: Start difference. First operand 220 states and 222 transitions. Second operand 131 states. [2018-12-03 18:14:07,554 WARN L180 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 18:14:08,144 WARN L180 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 18:14:08,753 WARN L180 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 153 [2018-12-03 18:14:09,281 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 18:14:09,780 WARN L180 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:14:10,271 WARN L180 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:14:10,770 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:14:11,234 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:14:11,686 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:14:12,177 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:14:12,584 WARN L180 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:14:12,988 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:14:13,367 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:14:13,731 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:14:17,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:17,661 INFO L93 Difference]: Finished difference Result 591 states and 597 transitions. [2018-12-03 18:14:17,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 219 states. [2018-12-03 18:14:17,661 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 219 [2018-12-03 18:14:17,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:17,663 INFO L225 Difference]: With dead ends: 591 [2018-12-03 18:14:17,663 INFO L226 Difference]: Without dead ends: 344 [2018-12-03 18:14:17,666 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 307 SyntacticMatches, 32 SemanticMatches, 348 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26556 ImplicationChecksByTransitivity, 39.8s TimeCoverageRelationStatistics Valid=8585, Invalid=113565, Unknown=0, NotChecked=0, Total=122150 [2018-12-03 18:14:17,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2018-12-03 18:14:17,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 227. [2018-12-03 18:14:17,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-12-03 18:14:17,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2018-12-03 18:14:17,738 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 219 [2018-12-03 18:14:17,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:17,739 INFO L480 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2018-12-03 18:14:17,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-03 18:14:17,739 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2018-12-03 18:14:17,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-12-03 18:14:17,740 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:17,740 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1] [2018-12-03 18:14:17,740 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:17,741 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:17,741 INFO L82 PathProgramCache]: Analyzing trace with hash 2116008107, now seen corresponding path program 54 times [2018-12-03 18:14:17,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:17,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:17,742 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:17,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:17,742 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:17,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:20,128 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:20,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:20,129 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:20,129 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:20,129 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:20,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:20,129 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:14:20,140 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:20,140 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:20,177 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:20,177 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:20,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:23,075 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:23,075 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:23,305 INFO L134 CoverageAnalysis]: Checked inductivity of 3473 backedges. 31 proven. 3442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:23,324 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:23,324 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 100 [2018-12-03 18:14:23,324 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:23,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 18:14:23,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 18:14:23,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=9834, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:14:23,325 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand 101 states. [2018-12-03 18:14:36,374 WARN L180 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 18:14:36,892 WARN L180 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 18:14:37,394 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2018-12-03 18:14:37,794 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 18:14:38,141 WARN L180 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 18:14:38,494 WARN L180 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:14:38,826 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:14:39,142 WARN L180 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:14:39,450 WARN L180 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:14:39,752 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:14:40,043 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:14:40,330 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:14:40,605 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:14:40,868 WARN L180 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:14:41,125 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:14:44,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:44,035 INFO L93 Difference]: Finished difference Result 484 states and 489 transitions. [2018-12-03 18:14:44,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-03 18:14:44,035 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 226 [2018-12-03 18:14:44,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:44,037 INFO L225 Difference]: With dead ends: 484 [2018-12-03 18:14:44,038 INFO L226 Difference]: Without dead ends: 358 [2018-12-03 18:14:44,039 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 581 GetRequests, 415 SyntacticMatches, 3 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4298 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=1579, Invalid=25481, Unknown=0, NotChecked=0, Total=27060 [2018-12-03 18:14:44,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2018-12-03 18:14:44,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 231. [2018-12-03 18:14:44,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2018-12-03 18:14:44,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 233 transitions. [2018-12-03 18:14:44,097 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 233 transitions. Word has length 226 [2018-12-03 18:14:44,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:44,097 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 233 transitions. [2018-12-03 18:14:44,097 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 18:14:44,097 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 233 transitions. [2018-12-03 18:14:44,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2018-12-03 18:14:44,098 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:44,098 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-03 18:14:44,099 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:44,099 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:44,099 INFO L82 PathProgramCache]: Analyzing trace with hash -237256110, now seen corresponding path program 55 times [2018-12-03 18:14:44,099 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:44,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:44,100 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:44,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:44,100 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:44,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:45,625 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:45,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:45,626 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:45,626 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:45,626 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:45,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:45,626 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:14:45,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:45,636 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:45,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:45,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:47,450 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:47,451 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:49,308 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 2080 proven. 1520 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:49,328 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:49,328 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 100 [2018-12-03 18:14:49,328 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:49,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 18:14:49,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 18:14:49,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:14:49,329 INFO L87 Difference]: Start difference. First operand 231 states and 233 transitions. Second operand 101 states. [2018-12-03 18:14:51,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:51,722 INFO L93 Difference]: Finished difference Result 495 states and 499 transitions. [2018-12-03 18:14:51,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 18:14:51,723 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 230 [2018-12-03 18:14:51,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:51,724 INFO L225 Difference]: With dead ends: 495 [2018-12-03 18:14:51,724 INFO L226 Difference]: Without dead ends: 236 [2018-12-03 18:14:51,725 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 361 SyntacticMatches, 65 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6272 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:14:51,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2018-12-03 18:14:51,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 234. [2018-12-03 18:14:51,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-12-03 18:14:51,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 236 transitions. [2018-12-03 18:14:51,787 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 236 transitions. Word has length 230 [2018-12-03 18:14:51,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:51,788 INFO L480 AbstractCegarLoop]: Abstraction has 234 states and 236 transitions. [2018-12-03 18:14:51,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 18:14:51,788 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 236 transitions. [2018-12-03 18:14:51,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2018-12-03 18:14:51,789 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:51,789 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1] [2018-12-03 18:14:51,789 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:51,790 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:51,790 INFO L82 PathProgramCache]: Analyzing trace with hash -170528822, now seen corresponding path program 56 times [2018-12-03 18:14:51,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:51,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:51,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:51,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:51,791 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:51,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:54,570 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 32 proven. 3665 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:54,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:54,571 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:54,571 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:54,571 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:54,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:54,571 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:14:54,580 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:54,580 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:54,646 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 18:14:54,646 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:54,650 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:01,420 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 2048 proven. 1649 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:01,421 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:07,735 INFO L134 CoverageAnalysis]: Checked inductivity of 3697 backedges. 2016 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:07,755 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:07,755 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 70, 70] total 173 [2018-12-03 18:15:07,755 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:07,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 139 states [2018-12-03 18:15:07,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2018-12-03 18:15:07,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3227, Invalid=26875, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 18:15:07,757 INFO L87 Difference]: Start difference. First operand 234 states and 236 transitions. Second operand 139 states. [2018-12-03 18:15:33,674 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 18:15:34,350 WARN L180 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 18:15:34,986 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 163 [2018-12-03 18:15:35,559 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 18:15:36,104 WARN L180 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 18:15:36,650 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 18:15:37,165 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:15:37,659 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:15:38,158 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:15:38,644 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:15:39,148 WARN L180 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:15:39,620 WARN L180 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:15:40,054 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:15:40,462 WARN L180 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:15:40,862 WARN L180 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:15:41,260 WARN L180 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:15:45,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:45,251 INFO L93 Difference]: Finished difference Result 629 states and 635 transitions. [2018-12-03 18:15:45,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 233 states. [2018-12-03 18:15:45,251 INFO L78 Accepts]: Start accepts. Automaton has 139 states. Word has length 233 [2018-12-03 18:15:45,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:45,253 INFO L225 Difference]: With dead ends: 629 [2018-12-03 18:15:45,253 INFO L226 Difference]: Without dead ends: 366 [2018-12-03 18:15:45,257 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 731 GetRequests, 327 SyntacticMatches, 34 SemanticMatches, 370 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30017 ImplicationChecksByTransitivity, 44.5s TimeCoverageRelationStatistics Valid=9599, Invalid=128413, Unknown=0, NotChecked=0, Total=138012 [2018-12-03 18:15:45,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2018-12-03 18:15:45,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 241. [2018-12-03 18:15:45,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2018-12-03 18:15:45,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2018-12-03 18:15:45,313 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 233 [2018-12-03 18:15:45,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:45,313 INFO L480 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2018-12-03 18:15:45,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has 139 states. [2018-12-03 18:15:45,313 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2018-12-03 18:15:45,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2018-12-03 18:15:45,314 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:45,314 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1] [2018-12-03 18:15:45,314 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:45,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:45,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1552518521, now seen corresponding path program 57 times [2018-12-03 18:15:45,315 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:45,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:45,315 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:45,315 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:45,316 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:45,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:47,991 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:47,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:47,991 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:47,991 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:47,991 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:47,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:47,992 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:15:48,002 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:48,003 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:48,043 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:48,043 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:48,047 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:51,004 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:51,004 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:51,281 INFO L134 CoverageAnalysis]: Checked inductivity of 3928 backedges. 33 proven. 3895 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:51,302 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:51,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 106 [2018-12-03 18:15:51,302 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:51,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 18:15:51,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 18:15:51,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=11060, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:15:51,303 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand 107 states. [2018-12-03 18:16:03,649 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 18:16:04,224 WARN L180 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 18:16:04,826 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 168 [2018-12-03 18:16:05,215 WARN L180 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 18:16:05,605 WARN L180 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 18:16:06,001 WARN L180 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 18:16:06,377 WARN L180 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 18:16:06,732 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:16:07,083 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:16:07,422 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:16:07,757 WARN L180 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:16:08,082 WARN L180 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:16:08,400 WARN L180 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:16:08,717 WARN L180 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:16:09,040 WARN L180 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:16:09,349 WARN L180 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:16:09,649 WARN L180 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:16:09,955 WARN L180 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 18:16:12,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:12,669 INFO L93 Difference]: Finished difference Result 514 states and 519 transitions. [2018-12-03 18:16:12,669 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2018-12-03 18:16:12,669 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 240 [2018-12-03 18:16:12,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:12,670 INFO L225 Difference]: With dead ends: 514 [2018-12-03 18:16:12,671 INFO L226 Difference]: Without dead ends: 380 [2018-12-03 18:16:12,672 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 441 SyntacticMatches, 3 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4838 ImplicationChecksByTransitivity, 16.0s TimeCoverageRelationStatistics Valid=1745, Invalid=28705, Unknown=0, NotChecked=0, Total=30450 [2018-12-03 18:16:12,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2018-12-03 18:16:12,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 245. [2018-12-03 18:16:12,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 245 states. [2018-12-03 18:16:12,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 247 transitions. [2018-12-03 18:16:12,738 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 247 transitions. Word has length 240 [2018-12-03 18:16:12,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:12,738 INFO L480 AbstractCegarLoop]: Abstraction has 245 states and 247 transitions. [2018-12-03 18:16:12,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 18:16:12,739 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 247 transitions. [2018-12-03 18:16:12,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-12-03 18:16:12,739 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:12,740 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-03 18:16:12,740 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:12,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:12,740 INFO L82 PathProgramCache]: Analyzing trace with hash 714244128, now seen corresponding path program 58 times [2018-12-03 18:16:12,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:12,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:12,741 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:12,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:12,741 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:12,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:14,318 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:14,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:14,318 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:14,318 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:14,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:14,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:14,319 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:16:14,327 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:14,327 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:14,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:14,376 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:16,646 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:16,646 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:18,130 INFO L134 CoverageAnalysis]: Checked inductivity of 4063 backedges. 2346 proven. 1717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:18,149 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:18,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 106 [2018-12-03 18:16:18,150 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:18,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 18:16:18,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 18:16:18,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:16:18,151 INFO L87 Difference]: Start difference. First operand 245 states and 247 transitions. Second operand 107 states. [2018-12-03 18:16:21,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:21,026 INFO L93 Difference]: Finished difference Result 525 states and 529 transitions. [2018-12-03 18:16:21,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 18:16:21,026 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 244 [2018-12-03 18:16:21,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:21,027 INFO L225 Difference]: With dead ends: 525 [2018-12-03 18:16:21,027 INFO L226 Difference]: Without dead ends: 250 [2018-12-03 18:16:21,028 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 383 SyntacticMatches, 69 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7072 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=4586, Invalid=15436, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:16:21,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-12-03 18:16:21,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 248. [2018-12-03 18:16:21,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-12-03 18:16:21,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 250 transitions. [2018-12-03 18:16:21,104 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 250 transitions. Word has length 244 [2018-12-03 18:16:21,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:21,104 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 250 transitions. [2018-12-03 18:16:21,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 18:16:21,104 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 250 transitions. [2018-12-03 18:16:21,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-12-03 18:16:21,105 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:21,105 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1] [2018-12-03 18:16:21,106 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:21,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:21,106 INFO L82 PathProgramCache]: Analyzing trace with hash 1637071768, now seen corresponding path program 59 times [2018-12-03 18:16:21,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:21,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:21,107 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:21,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:21,107 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:21,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:23,939 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 34 proven. 4132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:23,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:23,940 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:23,940 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:23,940 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:23,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:23,940 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:16:23,950 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:23,950 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:24,024 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 18:16:24,025 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:24,029 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:31,887 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 2312 proven. 1854 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:31,887 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:39,071 INFO L134 CoverageAnalysis]: Checked inductivity of 4166 backedges. 2278 proven. 1888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:39,090 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:39,090 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 74, 74] total 183 [2018-12-03 18:16:39,091 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:39,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 147 states [2018-12-03 18:16:39,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2018-12-03 18:16:39,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3596, Invalid=30076, Unknown=0, NotChecked=0, Total=33672 [2018-12-03 18:16:39,093 INFO L87 Difference]: Start difference. First operand 248 states and 250 transitions. Second operand 147 states. [2018-12-03 18:17:07,256 WARN L180 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 18:17:07,917 WARN L180 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 18:17:08,581 WARN L180 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 173 [2018-12-03 18:17:09,209 WARN L180 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 18:17:09,814 WARN L180 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 18:17:10,417 WARN L180 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 18:17:10,968 WARN L180 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 18:17:11,567 WARN L180 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 18:17:12,106 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:17:12,673 WARN L180 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:17:13,177 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:17:13,680 WARN L180 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:17:14,160 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:17:14,645 WARN L180 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:17:15,091 WARN L180 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:17:15,520 WARN L180 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:17:15,930 WARN L180 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:17:16,415 WARN L180 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:17:20,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:20,475 INFO L93 Difference]: Finished difference Result 667 states and 673 transitions. [2018-12-03 18:17:20,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 247 states. [2018-12-03 18:17:20,475 INFO L78 Accepts]: Start accepts. Automaton has 147 states. Word has length 247 [2018-12-03 18:17:20,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:20,477 INFO L225 Difference]: With dead ends: 667 [2018-12-03 18:17:20,477 INFO L226 Difference]: Without dead ends: 388 [2018-12-03 18:17:20,482 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 347 SyntacticMatches, 36 SemanticMatches, 392 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33690 ImplicationChecksByTransitivity, 49.8s TimeCoverageRelationStatistics Valid=10669, Invalid=144173, Unknown=0, NotChecked=0, Total=154842 [2018-12-03 18:17:20,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2018-12-03 18:17:20,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 255. [2018-12-03 18:17:20,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 255 states. [2018-12-03 18:17:20,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 257 transitions. [2018-12-03 18:17:20,554 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 257 transitions. Word has length 247 [2018-12-03 18:17:20,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:20,554 INFO L480 AbstractCegarLoop]: Abstraction has 255 states and 257 transitions. [2018-12-03 18:17:20,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has 147 states. [2018-12-03 18:17:20,554 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 257 transitions. [2018-12-03 18:17:20,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-12-03 18:17:20,555 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:20,555 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1] [2018-12-03 18:17:20,555 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:20,556 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:20,556 INFO L82 PathProgramCache]: Analyzing trace with hash -783420345, now seen corresponding path program 60 times [2018-12-03 18:17:20,556 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:20,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:20,557 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:20,557 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:20,557 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:20,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:23,641 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:23,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:23,641 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:23,641 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:23,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:23,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:23,642 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:17:23,651 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:23,652 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:23,693 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:23,693 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:23,697 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:27,146 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:27,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:27,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4411 backedges. 35 proven. 4376 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:27,465 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:27,465 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 112 [2018-12-03 18:17:27,465 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:27,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 18:17:27,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 18:17:27,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=12358, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:17:27,467 INFO L87 Difference]: Start difference. First operand 255 states and 257 transitions. Second operand 113 states. [2018-12-03 18:17:41,570 WARN L180 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 18:17:42,214 WARN L180 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 18:17:42,817 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2018-12-03 18:17:43,228 WARN L180 SmtUtils]: Spent 224.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 18:17:43,623 WARN L180 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 18:17:44,012 WARN L180 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 18:17:44,409 WARN L180 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 18:17:44,780 WARN L180 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 18:17:45,141 WARN L180 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 18:17:45,503 WARN L180 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:17:45,868 WARN L180 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:17:46,205 WARN L180 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:17:46,535 WARN L180 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:17:46,869 WARN L180 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:17:47,226 WARN L180 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:17:47,530 WARN L180 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:17:47,824 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:17:48,107 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:17:48,391 WARN L180 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:17:51,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:51,381 INFO L93 Difference]: Finished difference Result 544 states and 549 transitions. [2018-12-03 18:17:51,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2018-12-03 18:17:51,381 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 254 [2018-12-03 18:17:51,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:51,384 INFO L225 Difference]: With dead ends: 544 [2018-12-03 18:17:51,384 INFO L226 Difference]: Without dead ends: 402 [2018-12-03 18:17:51,386 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 653 GetRequests, 467 SyntacticMatches, 3 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5410 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=1919, Invalid=32121, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 18:17:51,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2018-12-03 18:17:51,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 259. [2018-12-03 18:17:51,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-12-03 18:17:51,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 261 transitions. [2018-12-03 18:17:51,458 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 261 transitions. Word has length 254 [2018-12-03 18:17:51,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:51,459 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 261 transitions. [2018-12-03 18:17:51,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 18:17:51,459 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 261 transitions. [2018-12-03 18:17:51,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2018-12-03 18:17:51,460 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:51,460 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-03 18:17:51,460 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:51,460 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:51,460 INFO L82 PathProgramCache]: Analyzing trace with hash 1175113710, now seen corresponding path program 61 times [2018-12-03 18:17:51,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:51,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:51,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:51,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:51,461 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:51,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:53,511 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:53,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:53,511 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:53,511 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:53,511 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:53,511 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:53,511 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:17:53,521 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:53,521 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:53,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:53,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:55,769 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:55,770 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:57,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4554 backedges. 2628 proven. 1926 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:57,750 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:57,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2018-12-03 18:17:57,751 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:57,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 18:17:57,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 18:17:57,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:17:57,752 INFO L87 Difference]: Start difference. First operand 259 states and 261 transitions. Second operand 113 states. [2018-12-03 18:18:00,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:00,638 INFO L93 Difference]: Finished difference Result 555 states and 559 transitions. [2018-12-03 18:18:00,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 18:18:00,639 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 258 [2018-12-03 18:18:00,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:00,640 INFO L225 Difference]: With dead ends: 555 [2018-12-03 18:18:00,641 INFO L226 Difference]: Without dead ends: 264 [2018-12-03 18:18:00,642 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 405 SyntacticMatches, 73 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7920 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=5107, Invalid=17243, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 18:18:00,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 264 states. [2018-12-03 18:18:00,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 264 to 262. [2018-12-03 18:18:00,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 262 states. [2018-12-03 18:18:00,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 264 transitions. [2018-12-03 18:18:00,714 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 264 transitions. Word has length 258 [2018-12-03 18:18:00,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:00,715 INFO L480 AbstractCegarLoop]: Abstraction has 262 states and 264 transitions. [2018-12-03 18:18:00,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 18:18:00,715 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 264 transitions. [2018-12-03 18:18:00,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2018-12-03 18:18:00,716 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:00,716 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1] [2018-12-03 18:18:00,716 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:00,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:00,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1470273894, now seen corresponding path program 62 times [2018-12-03 18:18:00,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:00,717 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:00,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:00,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:00,718 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:00,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:04,191 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 36 proven. 4627 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:04,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:04,191 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:04,192 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:04,192 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:04,192 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:04,192 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 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:18:04,202 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:18:04,202 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:18:04,316 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-03 18:18:04,316 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:04,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:12,729 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 2592 proven. 2071 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:12,730 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:20,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4663 backedges. 2556 proven. 2107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:20,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:20,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 78, 78] total 193 [2018-12-03 18:18:20,751 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:20,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2018-12-03 18:18:20,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2018-12-03 18:18:20,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3985, Invalid=33457, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:18:20,754 INFO L87 Difference]: Start difference. First operand 262 states and 264 transitions. Second operand 155 states. [2018-12-03 18:18:52,457 WARN L180 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 18:18:53,194 WARN L180 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 18:18:54,005 WARN L180 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 183 [2018-12-03 18:18:54,693 WARN L180 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-03 18:18:55,375 WARN L180 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 18:18:56,017 WARN L180 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 18:18:56,670 WARN L180 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 18:18:57,272 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 18:18:57,869 WARN L180 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 18:18:58,453 WARN L180 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 18:18:59,089 WARN L180 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:18:59,646 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:19:00,174 WARN L180 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:19:00,715 WARN L180 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:19:01,212 WARN L180 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:19:01,704 WARN L180 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:19:02,173 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:19:02,631 WARN L180 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:19:03,065 WARN L180 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:19:03,485 WARN L180 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:19:03,944 WARN L180 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 18:19:07,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:07,879 INFO L93 Difference]: Finished difference Result 705 states and 711 transitions. [2018-12-03 18:19:07,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 261 states. [2018-12-03 18:19:07,880 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 261 [2018-12-03 18:19:07,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:07,882 INFO L225 Difference]: With dead ends: 705 [2018-12-03 18:19:07,882 INFO L226 Difference]: Without dead ends: 410 [2018-12-03 18:19:07,887 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 819 GetRequests, 367 SyntacticMatches, 38 SemanticMatches, 414 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37575 ImplicationChecksByTransitivity, 55.9s TimeCoverageRelationStatistics Valid=11795, Invalid=160845, Unknown=0, NotChecked=0, Total=172640 [2018-12-03 18:19:07,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2018-12-03 18:19:07,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 269. [2018-12-03 18:19:07,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-12-03 18:19:07,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2018-12-03 18:19:07,969 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 261 [2018-12-03 18:19:07,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:07,969 INFO L480 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2018-12-03 18:19:07,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 155 states. [2018-12-03 18:19:07,969 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2018-12-03 18:19:07,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2018-12-03 18:19:07,970 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:07,971 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1] [2018-12-03 18:19:07,971 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:07,971 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:07,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1569385749, now seen corresponding path program 63 times [2018-12-03 18:19:07,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:07,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:07,972 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:07,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:07,972 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:07,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:11,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:11,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:11,439 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:11,439 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:11,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:11,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:11,440 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:19:11,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:19:11,450 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:19:11,494 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:19:11,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:11,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:15,179 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:15,179 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:15,484 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 37 proven. 4885 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:15,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:15,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 118 [2018-12-03 18:19:15,504 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:15,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 18:19:15,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 18:19:15,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=13728, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:19:15,505 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand 119 states. [2018-12-03 18:19:31,997 WARN L180 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-03 18:19:32,632 WARN L180 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2018-12-03 18:19:33,244 WARN L180 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 188 [2018-12-03 18:19:33,697 WARN L180 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2018-12-03 18:19:34,131 WARN L180 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2018-12-03 18:19:34,639 WARN L180 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2018-12-03 18:19:35,069 WARN L180 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2018-12-03 18:19:35,483 WARN L180 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2018-12-03 18:19:35,882 WARN L180 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2018-12-03 18:19:36,281 WARN L180 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2018-12-03 18:19:36,657 WARN L180 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2018-12-03 18:19:37,033 WARN L180 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2018-12-03 18:19:37,399 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2018-12-03 18:19:37,764 WARN L180 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2018-12-03 18:19:38,115 WARN L180 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2018-12-03 18:19:38,464 WARN L180 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2018-12-03 18:19:38,791 WARN L180 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2018-12-03 18:19:39,131 WARN L180 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2018-12-03 18:19:39,442 WARN L180 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2018-12-03 18:19:39,817 WARN L180 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2018-12-03 18:19:40,106 WARN L180 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2018-12-03 18:19:40,396 WARN L180 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2018-12-03 18:19:43,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:43,258 INFO L93 Difference]: Finished difference Result 574 states and 579 transitions. [2018-12-03 18:19:43,258 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 155 states. [2018-12-03 18:19:43,259 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 268 [2018-12-03 18:19:43,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:43,260 INFO L225 Difference]: With dead ends: 574 [2018-12-03 18:19:43,260 INFO L226 Difference]: Without dead ends: 424 [2018-12-03 18:19:43,262 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 689 GetRequests, 493 SyntacticMatches, 3 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6014 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=2101, Invalid=35729, Unknown=0, NotChecked=0, Total=37830 [2018-12-03 18:19:43,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2018-12-03 18:19:43,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 273. [2018-12-03 18:19:43,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 273 states. [2018-12-03 18:19:43,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2018-12-03 18:19:43,351 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 268 [2018-12-03 18:19:43,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:43,352 INFO L480 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2018-12-03 18:19:43,352 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 18:19:43,352 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2018-12-03 18:19:43,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2018-12-03 18:19:43,353 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:43,353 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1] [2018-12-03 18:19:43,353 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:43,353 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:43,353 INFO L82 PathProgramCache]: Analyzing trace with hash 107131324, now seen corresponding path program 64 times [2018-12-03 18:19:43,354 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:43,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:43,354 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:43,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:43,355 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:43,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:45,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:45,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:45,698 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:45,698 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:45,699 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:45,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:45,699 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:19:45,709 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:45,709 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:19:45,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:45,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:48,139 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:48,139 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:50,242 INFO L134 CoverageAnalysis]: Checked inductivity of 5073 backedges. 2926 proven. 2147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:50,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:50,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 118 [2018-12-03 18:19:50,262 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:50,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 18:19:50,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 18:19:50,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:19:50,264 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand 119 states. [2018-12-03 18:19:53,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:53,490 INFO L93 Difference]: Finished difference Result 585 states and 589 transitions. [2018-12-03 18:19:53,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 18:19:53,491 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 272 [2018-12-03 18:19:53,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:53,492 INFO L225 Difference]: With dead ends: 585 [2018-12-03 18:19:53,492 INFO L226 Difference]: Without dead ends: 278 [2018-12-03 18:19:53,494 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 660 GetRequests, 427 SyntacticMatches, 77 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8816 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=5656, Invalid=19150, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:19:53,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2018-12-03 18:19:53,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 276. [2018-12-03 18:19:53,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 276 states. [2018-12-03 18:19:53,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 278 transitions. [2018-12-03 18:19:53,583 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 278 transitions. Word has length 272 [2018-12-03 18:19:53,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:53,583 INFO L480 AbstractCegarLoop]: Abstraction has 276 states and 278 transitions. [2018-12-03 18:19:53,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 18:19:53,583 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 278 transitions. [2018-12-03 18:19:53,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-12-03 18:19:53,584 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:53,584 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1] [2018-12-03 18:19:53,584 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:53,584 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:53,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1761642804, now seen corresponding path program 65 times [2018-12-03 18:19:53,585 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:53,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:53,585 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:53,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:53,586 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:53,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:57,274 INFO L134 CoverageAnalysis]: Checked inductivity of 5188 backedges. 38 proven. 5150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:57,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:57,275 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:57,275 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:57,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:57,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:57,275 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:19:57,284 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:19:57,284 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:19:57,383 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-12-03 18:19:57,384 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:57,388 INFO L273 TraceCheckSpWp]: Computing forward predicates...