java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/up.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 18:02:38,229 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 18:02:38,231 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 18:02:38,243 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2018-12-03 18:02:38,277 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 18:02:38,290 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 18:02:38,290 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 18:02:38,291 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 18:02:38,291 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 18:02:38,292 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 18:02:38,292 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 18:02:38,292 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 18:02:38,292 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 18:02:38,292 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 18:02:38,293 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 18:02:38,293 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 18:02:38,293 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 18:02:38,293 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 18:02:38,294 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 18:02:38,294 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 18:02:38,295 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 18:02:38,295 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 18:02:38,295 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 18:02:38,295 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 18:02:38,295 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 18:02:38,296 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 18:02:38,296 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 18:02:38,296 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 18:02:38,296 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 18:02:38,296 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 18:02:38,296 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 18:02:38,299 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 18:02:38,299 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 18:02:38,300 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 18:02:38,300 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 18:02:38,300 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:02:38,300 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 18:02:38,300 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 18:02:38,301 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 18:02:38,301 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 18:02:38,301 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 18:02:38,301 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 18:02:38,301 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 18:02:38,303 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 18:02:38,345 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 18:02:38,364 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 18:02:38,372 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 18:02:38,374 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 18:02:38,374 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 18:02:38,375 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/up.i_4.bpl [2018-12-03 18:02:38,376 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/up.i_4.bpl' [2018-12-03 18:02:38,426 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 18:02:38,428 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 18:02:38,429 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 18:02:38,429 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 18:02:38,429 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 18:02:38,448 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,458 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,468 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 18:02:38,469 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 18:02:38,469 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 18:02:38,469 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 18:02:38,482 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,482 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,483 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,483 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,487 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,489 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,491 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/1) ... [2018-12-03 18:02:38,492 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 18:02:38,493 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 18:02:38,493 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 18:02:38,493 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 18:02:38,494 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (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 18:02:38,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-03 18:02:38,573 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-03 18:02:38,900 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-03 18:02:38,901 INFO L280 CfgBuilder]: Removed 2 assue(true) statements. [2018-12-03 18:02:38,901 INFO L202 PluginConnector]: Adding new model up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:02:38 BoogieIcfgContainer [2018-12-03 18:02:38,901 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 18:02:38,904 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 18:02:38,904 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 18:02:38,908 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 18:02:38,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:02:38" (1/2) ... [2018-12-03 18:02:38,910 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e7d0d9 and model type up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 06:02:38, skipping insertion in model container [2018-12-03 18:02:38,910 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "up.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:02:38" (2/2) ... [2018-12-03 18:02:38,913 INFO L112 eAbstractionObserver]: Analyzing ICFG up.i_4.bpl [2018-12-03 18:02:38,926 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 18:02:38,935 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 18:02:38,958 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 18:02:38,996 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 18:02:38,996 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 18:02:38,996 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 18:02:38,996 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 18:02:38,997 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 18:02:38,997 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 18:02:38,997 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 18:02:38,997 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 18:02:39,013 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2018-12-03 18:02:39,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 18:02:39,020 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:39,021 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2018-12-03 18:02:39,024 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:39,029 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:39,030 INFO L82 PathProgramCache]: Analyzing trace with hash 28787237, now seen corresponding path program 1 times [2018-12-03 18:02:39,032 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:39,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:39,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:39,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:39,079 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:39,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:39,263 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 18:02:39,266 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:02:39,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-03 18:02:39,267 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:02:39,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-12-03 18:02:39,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-12-03 18:02:39,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-12-03 18:02:39,305 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 4 states. [2018-12-03 18:02:39,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:39,451 INFO L93 Difference]: Finished difference Result 14 states and 17 transitions. [2018-12-03 18:02:39,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 18:02:39,453 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2018-12-03 18:02:39,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:39,464 INFO L225 Difference]: With dead ends: 14 [2018-12-03 18:02:39,464 INFO L226 Difference]: Without dead ends: 7 [2018-12-03 18:02:39,468 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 18:02:39,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-12-03 18:02:39,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-12-03 18:02:39,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-12-03 18:02:39,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2018-12-03 18:02:39,501 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 5 [2018-12-03 18:02:39,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:39,501 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2018-12-03 18:02:39,502 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-12-03 18:02:39,502 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2018-12-03 18:02:39,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-12-03 18:02:39,502 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:39,503 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2018-12-03 18:02:39,503 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:39,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:39,503 INFO L82 PathProgramCache]: Analyzing trace with hash 894126414, now seen corresponding path program 1 times [2018-12-03 18:02:39,504 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:39,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:39,505 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:39,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:39,505 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:39,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:39,758 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 18:02:39,759 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:02:39,759 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-12-03 18:02:39,759 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:02:39,761 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-03 18:02:39,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-03 18:02:39,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-12-03 18:02:39,763 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 5 states. [2018-12-03 18:02:39,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:39,947 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2018-12-03 18:02:39,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:02:39,948 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 6 [2018-12-03 18:02:39,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:39,949 INFO L225 Difference]: With dead ends: 15 [2018-12-03 18:02:39,949 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 18:02:39,950 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2018-12-03 18:02:39,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 18:02:39,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 9. [2018-12-03 18:02:39,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-12-03 18:02:39,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-12-03 18:02:39,955 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2018-12-03 18:02:39,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:39,955 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-12-03 18:02:39,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-03 18:02:39,955 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-12-03 18:02:39,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-12-03 18:02:39,956 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:39,956 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-12-03 18:02:39,957 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:39,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:39,957 INFO L82 PathProgramCache]: Analyzing trace with hash 261957866, now seen corresponding path program 1 times [2018-12-03 18:02:39,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:39,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:39,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:39,959 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:39,959 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:39,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:40,075 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:40,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:40,075 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:40,076 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 9 with the following transitions: [2018-12-03 18:02:40,079 INFO L205 CegarAbsIntRunner]: [0], [5], [7], [9], [13], [15], [17] [2018-12-03 18:02:40,136 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:02:40,137 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:02:40,899 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:02:40,902 INFO L272 AbstractInterpreter]: Visited 7 different actions 68 times. Merged at 6 different actions 53 times. Widened at 5 different actions 25 times. Found 7 fixpoints after 4 different actions. Largest state had 0 variables. [2018-12-03 18:02:40,943 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:40,945 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:02:40,946 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:40,946 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 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 18:02:40,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:40,963 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:40,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:41,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:41,346 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:41,347 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:41,409 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:41,430 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:41,430 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2018-12-03 18:02:41,431 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:41,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 18:02:41,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 18:02:41,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-12-03 18:02:41,433 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 8 states. [2018-12-03 18:02:41,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:41,581 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2018-12-03 18:02:41,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:02:41,581 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-12-03 18:02:41,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:41,582 INFO L225 Difference]: With dead ends: 17 [2018-12-03 18:02:41,582 INFO L226 Difference]: Without dead ends: 10 [2018-12-03 18:02:41,583 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:02:41,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-12-03 18:02:41,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-12-03 18:02:41,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-12-03 18:02:41,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2018-12-03 18:02:41,587 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 8 [2018-12-03 18:02:41,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:41,587 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2018-12-03 18:02:41,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 18:02:41,588 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2018-12-03 18:02:41,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 18:02:41,588 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:41,588 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2018-12-03 18:02:41,589 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:41,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:41,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1187669281, now seen corresponding path program 2 times [2018-12-03 18:02:41,590 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:41,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:41,591 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:41,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:41,591 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:41,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:41,814 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:41,814 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:41,815 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:41,815 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:41,816 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:41,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:41,816 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 18:02:41,826 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:41,826 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:41,862 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-12-03 18:02:41,862 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:41,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:41,884 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:41,885 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:41,984 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:42,006 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:42,006 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 7 [2018-12-03 18:02:42,006 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:42,006 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 18:02:42,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 18:02:42,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2018-12-03 18:02:42,008 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand 8 states. [2018-12-03 18:02:42,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:42,098 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2018-12-03 18:02:42,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 18:02:42,099 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 9 [2018-12-03 18:02:42,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:42,100 INFO L225 Difference]: With dead ends: 18 [2018-12-03 18:02:42,100 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 18:02:42,100 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:02:42,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 18:02:42,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 12. [2018-12-03 18:02:42,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 18:02:42,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2018-12-03 18:02:42,105 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 9 [2018-12-03 18:02:42,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:42,105 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2018-12-03 18:02:42,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 18:02:42,105 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2018-12-03 18:02:42,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 18:02:42,106 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:42,106 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1] [2018-12-03 18:02:42,106 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:42,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:42,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1111188483, now seen corresponding path program 3 times [2018-12-03 18:02:42,107 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:42,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:42,108 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:42,108 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:42,108 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:42,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:42,327 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:42,327 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:42,327 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:42,328 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:42,328 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:42,328 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:42,328 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 18:02:42,342 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:42,342 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:42,375 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:42,375 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:42,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:42,677 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:42,677 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:42,723 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:42,743 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:42,743 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 10 [2018-12-03 18:02:42,743 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:42,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 18:02:42,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 18:02:42,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:02:42,745 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 11 states. [2018-12-03 18:02:42,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:42,888 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2018-12-03 18:02:42,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 18:02:42,888 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-12-03 18:02:42,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:42,891 INFO L225 Difference]: With dead ends: 22 [2018-12-03 18:02:42,891 INFO L226 Difference]: Without dead ends: 13 [2018-12-03 18:02:42,892 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 13 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:02:42,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-12-03 18:02:42,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-12-03 18:02:42,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-12-03 18:02:42,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-12-03 18:02:42,897 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2018-12-03 18:02:42,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:42,897 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-12-03 18:02:42,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 18:02:42,898 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-12-03 18:02:42,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-03 18:02:42,898 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:42,898 INFO L402 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1] [2018-12-03 18:02:42,899 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:42,899 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:42,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1227431834, now seen corresponding path program 4 times [2018-12-03 18:02:42,899 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:42,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:42,900 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:42,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:42,900 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:42,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:43,054 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:43,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:43,055 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:43,055 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:43,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:43,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:43,056 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 18:02:43,064 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:43,065 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:43,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:43,092 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:43,113 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:43,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:43,196 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:43,216 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:43,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 8 [2018-12-03 18:02:43,216 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:43,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-12-03 18:02:43,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-12-03 18:02:43,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-12-03 18:02:43,217 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2018-12-03 18:02:43,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:43,398 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2018-12-03 18:02:43,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 18:02:43,399 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 12 [2018-12-03 18:02:43,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:43,399 INFO L225 Difference]: With dead ends: 21 [2018-12-03 18:02:43,399 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:02:43,400 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-12-03 18:02:43,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:02:43,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2018-12-03 18:02:43,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-12-03 18:02:43,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-12-03 18:02:43,404 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2018-12-03 18:02:43,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:43,405 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-12-03 18:02:43,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-12-03 18:02:43,405 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-12-03 18:02:43,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-12-03 18:02:43,405 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:43,406 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1] [2018-12-03 18:02:43,406 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:43,406 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:43,406 INFO L82 PathProgramCache]: Analyzing trace with hash 1553947138, now seen corresponding path program 5 times [2018-12-03 18:02:43,406 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:43,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:43,407 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:43,407 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:43,407 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:43,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:43,656 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:43,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:43,657 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:43,657 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:43,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:43,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:43,658 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 18:02:43,667 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:43,667 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:43,684 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-12-03 18:02:43,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:43,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:43,821 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:43,822 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:43,887 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:43,911 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:43,912 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2018-12-03 18:02:43,912 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:43,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:02:43,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:02:43,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:02:43,913 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 14 states. [2018-12-03 18:02:44,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:44,061 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-12-03 18:02:44,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 18:02:44,061 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-12-03 18:02:44,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:44,062 INFO L225 Difference]: With dead ends: 27 [2018-12-03 18:02:44,062 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 18:02:44,063 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 16 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=215, Unknown=0, NotChecked=0, Total=306 [2018-12-03 18:02:44,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 18:02:44,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-12-03 18:02:44,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-12-03 18:02:44,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-12-03 18:02:44,067 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2018-12-03 18:02:44,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:44,068 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-12-03 18:02:44,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:02:44,068 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-12-03 18:02:44,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 18:02:44,068 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:44,068 INFO L402 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1] [2018-12-03 18:02:44,069 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:44,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:44,069 INFO L82 PathProgramCache]: Analyzing trace with hash 291918073, now seen corresponding path program 6 times [2018-12-03 18:02:44,069 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:44,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:44,070 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:44,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:44,070 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:44,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:44,211 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:44,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:44,212 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:44,212 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:44,212 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:44,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:44,212 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 18:02:44,228 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:44,228 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:44,243 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:44,244 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:44,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:44,263 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:44,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:44,325 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:44,345 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:44,345 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 9 [2018-12-03 18:02:44,345 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:44,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 18:02:44,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 18:02:44,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-12-03 18:02:44,346 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 10 states. [2018-12-03 18:02:44,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:44,469 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2018-12-03 18:02:44,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 18:02:44,470 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2018-12-03 18:02:44,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:44,470 INFO L225 Difference]: With dead ends: 24 [2018-12-03 18:02:44,471 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 18:02:44,471 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 8 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=131, Unknown=0, NotChecked=0, Total=210 [2018-12-03 18:02:44,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 18:02:44,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2018-12-03 18:02:44,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-03 18:02:44,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-12-03 18:02:44,476 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2018-12-03 18:02:44,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:44,476 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-12-03 18:02:44,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 18:02:44,477 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-12-03 18:02:44,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-03 18:02:44,477 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:44,478 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1] [2018-12-03 18:02:44,478 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:44,478 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:44,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1360327125, now seen corresponding path program 7 times [2018-12-03 18:02:44,479 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:44,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:44,480 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:44,480 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:44,480 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:44,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:44,668 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:44,669 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:44,669 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:44,669 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:44,670 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:44,670 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:44,670 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 18:02:44,681 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:44,681 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:44,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:44,697 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:44,834 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:44,834 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:44,909 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 20 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:44,929 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:44,929 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 16 [2018-12-03 18:02:44,929 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:44,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 18:02:44,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 18:02:44,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:02:44,931 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 17 states. [2018-12-03 18:02:45,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:45,181 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-12-03 18:02:45,182 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 18:02:45,182 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-12-03 18:02:45,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:45,182 INFO L225 Difference]: With dead ends: 32 [2018-12-03 18:02:45,183 INFO L226 Difference]: Without dead ends: 19 [2018-12-03 18:02:45,183 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 19 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=331, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:02:45,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-12-03 18:02:45,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-12-03 18:02:45,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-12-03 18:02:45,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-12-03 18:02:45,189 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 17 [2018-12-03 18:02:45,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:45,189 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-12-03 18:02:45,189 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 18:02:45,189 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-12-03 18:02:45,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-12-03 18:02:45,190 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:45,190 INFO L402 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1] [2018-12-03 18:02:45,190 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:45,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:45,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1898806402, now seen corresponding path program 8 times [2018-12-03 18:02:45,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:45,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:45,192 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:45,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:45,192 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:45,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:45,337 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:45,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:45,338 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:45,338 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:45,338 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:45,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:45,339 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:02:45,350 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:45,350 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:45,369 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-12-03 18:02:45,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:45,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:45,467 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:45,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:45,530 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 15 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:45,550 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:45,550 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 10 [2018-12-03 18:02:45,550 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:45,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-12-03 18:02:45,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-12-03 18:02:45,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:02:45,552 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 11 states. [2018-12-03 18:02:45,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:45,977 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2018-12-03 18:02:45,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:02:45,978 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2018-12-03 18:02:45,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:45,978 INFO L225 Difference]: With dead ends: 27 [2018-12-03 18:02:45,978 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 18:02:45,979 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 10 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:02:45,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 18:02:45,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2018-12-03 18:02:45,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-12-03 18:02:45,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-12-03 18:02:45,985 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2018-12-03 18:02:45,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:45,985 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-12-03 18:02:45,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-12-03 18:02:45,986 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-12-03 18:02:45,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-03 18:02:45,986 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:45,986 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1] [2018-12-03 18:02:45,987 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:45,987 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:45,987 INFO L82 PathProgramCache]: Analyzing trace with hash 608081690, now seen corresponding path program 9 times [2018-12-03 18:02:45,987 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:45,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:45,988 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:45,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:45,988 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:45,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:46,241 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:46,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:46,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:46,242 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:46,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:46,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:46,242 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 18:02:46,251 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:46,252 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:46,296 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:46,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:46,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:46,684 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:46,685 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:46,836 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 30 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:46,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:46,857 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 19 [2018-12-03 18:02:46,857 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:46,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 18:02:46,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 18:02:46,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:02:46,858 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 20 states. [2018-12-03 18:02:47,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:47,042 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2018-12-03 18:02:47,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 18:02:47,042 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-12-03 18:02:47,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:47,043 INFO L225 Difference]: With dead ends: 37 [2018-12-03 18:02:47,043 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 18:02:47,044 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 22 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=178, Invalid=472, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:02:47,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 18:02:47,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-03 18:02:47,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-03 18:02:47,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-12-03 18:02:47,049 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2018-12-03 18:02:47,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:47,050 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-12-03 18:02:47,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 18:02:47,050 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-12-03 18:02:47,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 18:02:47,050 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:47,051 INFO L402 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1] [2018-12-03 18:02:47,051 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:47,051 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:47,051 INFO L82 PathProgramCache]: Analyzing trace with hash -208127791, now seen corresponding path program 10 times [2018-12-03 18:02:47,051 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:47,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:47,052 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:47,052 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:47,053 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:47,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:47,241 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:47,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:47,241 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:47,242 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:47,242 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:47,242 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:47,242 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 18:02:47,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:47,262 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:47,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:47,298 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:47,337 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:47,338 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:47,505 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 21 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:47,525 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:47,526 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 11 [2018-12-03 18:02:47,526 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:47,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 18:02:47,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 18:02:47,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2018-12-03 18:02:47,527 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 12 states. [2018-12-03 18:02:47,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:47,683 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2018-12-03 18:02:47,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 18:02:47,684 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-12-03 18:02:47,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:47,684 INFO L225 Difference]: With dead ends: 30 [2018-12-03 18:02:47,685 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 18:02:47,685 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2018-12-03 18:02:47,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 18:02:47,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2018-12-03 18:02:47,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 18:02:47,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-12-03 18:02:47,691 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2018-12-03 18:02:47,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:47,691 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-12-03 18:02:47,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 18:02:47,692 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-12-03 18:02:47,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 18:02:47,692 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:47,693 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1] [2018-12-03 18:02:47,693 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:47,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:47,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1852588973, now seen corresponding path program 11 times [2018-12-03 18:02:47,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:47,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:47,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:47,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:47,695 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:47,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:47,929 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:47,930 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:47,930 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:47,930 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:47,930 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:47,931 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:47,931 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 18:02:47,941 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:47,941 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:47,969 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-12-03 18:02:47,970 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:47,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:48,117 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:48,117 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:48,432 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 42 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:48,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:48,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 22 [2018-12-03 18:02:48,454 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:48,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 18:02:48,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 18:02:48,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:02:48,455 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 23 states. [2018-12-03 18:02:48,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:48,771 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2018-12-03 18:02:48,771 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 18:02:48,771 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-12-03 18:02:48,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:48,772 INFO L225 Difference]: With dead ends: 42 [2018-12-03 18:02:48,772 INFO L226 Difference]: Without dead ends: 25 [2018-12-03 18:02:48,773 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 25 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=232, Invalid=638, Unknown=0, NotChecked=0, Total=870 [2018-12-03 18:02:48,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-12-03 18:02:48,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-12-03 18:02:48,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-12-03 18:02:48,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-12-03 18:02:48,779 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 23 [2018-12-03 18:02:48,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:48,780 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-12-03 18:02:48,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 18:02:48,780 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-12-03 18:02:48,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-12-03 18:02:48,781 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:48,781 INFO L402 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1] [2018-12-03 18:02:48,781 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:48,781 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:48,782 INFO L82 PathProgramCache]: Analyzing trace with hash -34196842, now seen corresponding path program 12 times [2018-12-03 18:02:48,782 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:48,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:48,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:48,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:48,783 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:48,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:48,940 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:48,940 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:48,941 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:48,941 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:48,941 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:48,941 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:48,941 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 18:02:48,953 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:48,953 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:48,973 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:48,973 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:48,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:49,015 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:49,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:49,097 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:49,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:49,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 12 [2018-12-03 18:02:49,117 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:49,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-12-03 18:02:49,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-12-03 18:02:49,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2018-12-03 18:02:49,118 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 13 states. [2018-12-03 18:02:49,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:49,266 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2018-12-03 18:02:49,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 18:02:49,266 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-12-03 18:02:49,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:49,267 INFO L225 Difference]: With dead ends: 33 [2018-12-03 18:02:49,268 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 18:02:49,269 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 38 SyntacticMatches, 14 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=157, Invalid=263, Unknown=0, NotChecked=0, Total=420 [2018-12-03 18:02:49,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 18:02:49,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2018-12-03 18:02:49,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-12-03 18:02:49,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-12-03 18:02:49,275 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2018-12-03 18:02:49,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:49,275 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-12-03 18:02:49,275 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-12-03 18:02:49,275 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-12-03 18:02:49,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-12-03 18:02:49,276 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:49,276 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1] [2018-12-03 18:02:49,276 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:49,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:49,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1496506418, now seen corresponding path program 13 times [2018-12-03 18:02:49,277 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:49,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:49,278 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:49,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:49,278 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:49,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:49,689 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:49,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:49,689 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:49,690 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:49,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:49,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:49,690 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 18:02:49,700 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:49,700 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:49,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:49,721 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:49,865 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:49,866 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:49,980 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 56 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:49,999 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:50,000 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 25 [2018-12-03 18:02:50,000 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:50,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:02:50,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:02:50,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:02:50,002 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 26 states. [2018-12-03 18:02:50,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:50,363 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2018-12-03 18:02:50,363 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 18:02:50,363 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-12-03 18:02:50,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:50,364 INFO L225 Difference]: With dead ends: 47 [2018-12-03 18:02:50,364 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 18:02:50,366 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 28 SyntacticMatches, 15 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=293, Invalid=829, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:02:50,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 18:02:50,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-03 18:02:50,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 18:02:50,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-12-03 18:02:50,371 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2018-12-03 18:02:50,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:50,372 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-12-03 18:02:50,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:02:50,372 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-12-03 18:02:50,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 18:02:50,373 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:50,373 INFO L402 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1] [2018-12-03 18:02:50,373 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:50,373 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:50,373 INFO L82 PathProgramCache]: Analyzing trace with hash 497294505, now seen corresponding path program 14 times [2018-12-03 18:02:50,373 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:50,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:50,374 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:50,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:50,375 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:50,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:50,533 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:50,533 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:50,533 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:50,534 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:50,534 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:50,534 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:50,534 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 18:02:50,543 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:50,543 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:50,615 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-12-03 18:02:50,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:50,618 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:50,644 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:50,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:50,749 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:50,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:50,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 13 [2018-12-03 18:02:50,771 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:50,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:02:50,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:02:50,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:02:50,772 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2018-12-03 18:02:51,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:51,031 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2018-12-03 18:02:51,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 18:02:51,032 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-12-03 18:02:51,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:51,033 INFO L225 Difference]: With dead ends: 36 [2018-12-03 18:02:51,033 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 18:02:51,034 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 43 SyntacticMatches, 16 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=189, Invalid=317, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:02:51,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 18:02:51,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-12-03 18:02:51,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 18:02:51,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-12-03 18:02:51,041 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 27 [2018-12-03 18:02:51,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:51,041 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-12-03 18:02:51,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:02:51,041 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-12-03 18:02:51,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 18:02:51,042 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:51,042 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1] [2018-12-03 18:02:51,042 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:51,043 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:51,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1158582661, now seen corresponding path program 15 times [2018-12-03 18:02:51,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:51,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:51,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:51,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:51,044 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:51,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:51,346 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:51,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:51,347 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:51,347 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:51,347 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:51,347 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:51,347 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 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 18:02:51,358 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:51,359 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:51,379 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:51,380 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:51,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:51,761 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:51,761 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:51,947 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 72 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:51,967 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:51,967 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 28 [2018-12-03 18:02:51,967 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:51,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 18:02:51,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 18:02:51,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:02:51,969 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 29 states. [2018-12-03 18:02:52,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:52,251 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2018-12-03 18:02:52,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 18:02:52,252 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-12-03 18:02:52,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:52,253 INFO L225 Difference]: With dead ends: 52 [2018-12-03 18:02:52,253 INFO L226 Difference]: Without dead ends: 31 [2018-12-03 18:02:52,254 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 31 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=361, Invalid=1045, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:02:52,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-12-03 18:02:52,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-12-03 18:02:52,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-12-03 18:02:52,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-12-03 18:02:52,260 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 29 [2018-12-03 18:02:52,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:52,260 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-12-03 18:02:52,260 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 18:02:52,260 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-12-03 18:02:52,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-12-03 18:02:52,261 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:52,261 INFO L402 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1] [2018-12-03 18:02:52,261 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:52,261 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:52,261 INFO L82 PathProgramCache]: Analyzing trace with hash 2054811054, now seen corresponding path program 16 times [2018-12-03 18:02:52,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:52,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:52,262 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:52,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:52,263 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:52,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:52,594 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:52,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:52,594 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:52,594 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:52,595 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:52,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:52,595 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 18:02:52,605 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:52,605 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:52,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:52,632 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:52,657 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:52,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:52,840 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 45 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:52,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:52,863 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 14 [2018-12-03 18:02:52,863 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:52,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-12-03 18:02:52,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-12-03 18:02:52,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=127, Unknown=0, NotChecked=0, Total=210 [2018-12-03 18:02:52,864 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 15 states. [2018-12-03 18:02:53,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:53,360 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-12-03 18:02:53,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 18:02:53,360 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 30 [2018-12-03 18:02:53,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:53,361 INFO L225 Difference]: With dead ends: 39 [2018-12-03 18:02:53,361 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 18:02:53,362 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 18 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=224, Invalid=376, Unknown=0, NotChecked=0, Total=600 [2018-12-03 18:02:53,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 18:02:53,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2018-12-03 18:02:53,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-03 18:02:53,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2018-12-03 18:02:53,370 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2018-12-03 18:02:53,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:53,371 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2018-12-03 18:02:53,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-12-03 18:02:53,371 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2018-12-03 18:02:53,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-12-03 18:02:53,372 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:53,372 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1] [2018-12-03 18:02:53,372 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:53,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:53,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1011600054, now seen corresponding path program 17 times [2018-12-03 18:02:53,372 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:53,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:53,373 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:53,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:53,374 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:53,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:53,657 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:53,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:53,657 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:53,658 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:53,658 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:53,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:53,658 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 18:02:53,667 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:53,668 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:53,696 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-12-03 18:02:53,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:53,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:53,903 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:53,903 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:54,108 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 90 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:54,128 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:54,128 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 31 [2018-12-03 18:02:54,128 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:54,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:02:54,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:02:54,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:02:54,130 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 32 states. [2018-12-03 18:02:54,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:54,944 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2018-12-03 18:02:54,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 18:02:54,945 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 32 [2018-12-03 18:02:54,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:54,945 INFO L225 Difference]: With dead ends: 57 [2018-12-03 18:02:54,946 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 18:02:54,947 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 34 SyntacticMatches, 19 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=436, Invalid=1286, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 18:02:54,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 18:02:54,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-12-03 18:02:54,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 18:02:54,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2018-12-03 18:02:54,954 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 32 [2018-12-03 18:02:54,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:54,955 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2018-12-03 18:02:54,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:02:54,955 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2018-12-03 18:02:54,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 18:02:54,956 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:54,956 INFO L402 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1] [2018-12-03 18:02:54,956 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:54,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:54,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1011743873, now seen corresponding path program 18 times [2018-12-03 18:02:54,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:54,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:54,958 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:54,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:54,958 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:54,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:55,163 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:55,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:55,163 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:55,164 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:55,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:55,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:55,164 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 18:02:55,173 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:55,173 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:55,199 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:55,200 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:55,202 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:55,260 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:55,261 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:55,587 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 55 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:55,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:55,621 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 15 [2018-12-03 18:02:55,621 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:55,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 18:02:55,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 18:02:55,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2018-12-03 18:02:55,622 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 16 states. [2018-12-03 18:02:56,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:56,136 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2018-12-03 18:02:56,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 18:02:56,136 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2018-12-03 18:02:56,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:56,137 INFO L225 Difference]: With dead ends: 42 [2018-12-03 18:02:56,137 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 18:02:56,138 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 53 SyntacticMatches, 20 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=262, Invalid=440, Unknown=0, NotChecked=0, Total=702 [2018-12-03 18:02:56,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 18:02:56,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 36. [2018-12-03 18:02:56,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-03 18:02:56,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2018-12-03 18:02:56,146 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 33 [2018-12-03 18:02:56,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:56,146 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2018-12-03 18:02:56,146 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 18:02:56,146 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2018-12-03 18:02:56,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 18:02:56,147 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:56,147 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1] [2018-12-03 18:02:56,147 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:56,147 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:56,147 INFO L82 PathProgramCache]: Analyzing trace with hash 1623186269, now seen corresponding path program 19 times [2018-12-03 18:02:56,148 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:56,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:56,149 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:56,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:56,149 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:56,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:56,449 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:56,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:56,450 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:56,450 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:56,450 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:56,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:56,451 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 18:02:56,463 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:56,464 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:02:56,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:56,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:56,727 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:56,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:57,396 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 110 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:57,415 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:57,415 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 34 [2018-12-03 18:02:57,415 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:57,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 18:02:57,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 18:02:57,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:02:57,417 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 35 states. [2018-12-03 18:02:57,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:57,708 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2018-12-03 18:02:57,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 18:02:57,708 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 35 [2018-12-03 18:02:57,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:57,709 INFO L225 Difference]: With dead ends: 62 [2018-12-03 18:02:57,709 INFO L226 Difference]: Without dead ends: 37 [2018-12-03 18:02:57,710 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 37 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 640 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=518, Invalid=1552, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 18:02:57,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-12-03 18:02:57,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-12-03 18:02:57,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-12-03 18:02:57,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-12-03 18:02:57,716 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 35 [2018-12-03 18:02:57,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:57,716 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-12-03 18:02:57,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 18:02:57,717 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-12-03 18:02:57,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-12-03 18:02:57,717 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:57,718 INFO L402 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1] [2018-12-03 18:02:57,718 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:57,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:57,718 INFO L82 PathProgramCache]: Analyzing trace with hash -803883834, now seen corresponding path program 20 times [2018-12-03 18:02:57,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:57,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:57,719 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:02:57,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:57,719 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:57,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:58,707 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:58,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:58,707 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:58,707 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:58,708 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:58,708 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:58,708 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 18:02:58,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:02:58,719 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:02:58,800 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-12-03 18:02:58,801 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:58,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:02:58,852 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:58,853 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:02:58,979 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 66 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:58,999 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:02:58,999 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 16 [2018-12-03 18:02:58,999 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:02:58,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-12-03 18:02:58,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-12-03 18:02:59,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=162, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:02:59,000 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 17 states. [2018-12-03 18:02:59,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:02:59,211 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2018-12-03 18:02:59,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 18:02:59,215 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2018-12-03 18:02:59,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:02:59,216 INFO L225 Difference]: With dead ends: 45 [2018-12-03 18:02:59,216 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 18:02:59,216 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 58 SyntacticMatches, 22 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=303, Invalid=509, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:02:59,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 18:02:59,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2018-12-03 18:02:59,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-12-03 18:02:59,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-12-03 18:02:59,225 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2018-12-03 18:02:59,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:02:59,226 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-12-03 18:02:59,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-12-03 18:02:59,226 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-12-03 18:02:59,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-12-03 18:02:59,226 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:02:59,226 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1] [2018-12-03 18:02:59,227 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:02:59,227 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:02:59,227 INFO L82 PathProgramCache]: Analyzing trace with hash 561682018, now seen corresponding path program 21 times [2018-12-03 18:02:59,227 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:02:59,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:59,228 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:02:59,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:02:59,228 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:02:59,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:02:59,732 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:02:59,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:59,733 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:02:59,733 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:02:59,733 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:02:59,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:02:59,733 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 18:02:59,743 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:02:59,743 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:02:59,774 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:02:59,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:02:59,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:00,038 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:00,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:00,221 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 132 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:00,240 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:00,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 37 [2018-12-03 18:03:00,241 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:00,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:03:00,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:03:00,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:03:00,242 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 38 states. [2018-12-03 18:03:00,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:00,673 INFO L93 Difference]: Finished difference Result 67 states and 69 transitions. [2018-12-03 18:03:00,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 18:03:00,673 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 38 [2018-12-03 18:03:00,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:00,674 INFO L225 Difference]: With dead ends: 67 [2018-12-03 18:03:00,674 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 18:03:00,676 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 40 SyntacticMatches, 23 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 770 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=607, Invalid=1843, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:03:00,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 18:03:00,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-12-03 18:03:00,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-12-03 18:03:00,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2018-12-03 18:03:00,683 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 38 [2018-12-03 18:03:00,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:00,683 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2018-12-03 18:03:00,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:03:00,683 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2018-12-03 18:03:00,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-03 18:03:00,684 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:00,684 INFO L402 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1] [2018-12-03 18:03:00,684 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:00,685 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:00,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1490671705, now seen corresponding path program 22 times [2018-12-03 18:03:00,685 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:00,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:00,686 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:00,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:00,686 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:00,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:01,022 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:01,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:01,022 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:01,022 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:01,023 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:01,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:01,023 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 18:03:01,031 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:01,032 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:01,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:01,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:01,325 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:01,325 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:01,746 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 78 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:01,766 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:01,766 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 17 [2018-12-03 18:03:01,767 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:01,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 18:03:01,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 18:03:01,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2018-12-03 18:03:01,768 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 18 states. [2018-12-03 18:03:02,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:02,048 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2018-12-03 18:03:02,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 18:03:02,048 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 39 [2018-12-03 18:03:02,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:02,049 INFO L225 Difference]: With dead ends: 48 [2018-12-03 18:03:02,049 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 18:03:02,050 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 63 SyntacticMatches, 24 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=347, Invalid=583, Unknown=0, NotChecked=0, Total=930 [2018-12-03 18:03:02,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 18:03:02,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2018-12-03 18:03:02,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-03 18:03:02,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-12-03 18:03:02,060 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2018-12-03 18:03:02,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:02,060 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-12-03 18:03:02,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 18:03:02,060 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-12-03 18:03:02,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-03 18:03:02,061 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:02,061 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1] [2018-12-03 18:03:02,061 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:02,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:02,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1983635147, now seen corresponding path program 23 times [2018-12-03 18:03:02,062 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:02,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:02,063 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:02,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:02,063 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:02,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:02,481 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:02,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:02,481 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:02,482 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:02,482 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:02,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:02,483 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 18:03:02,493 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:02,493 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:02,536 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-12-03 18:03:02,536 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:02,538 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:02,978 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:02,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:03,246 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 156 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:03,266 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:03,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 40 [2018-12-03 18:03:03,267 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:03,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 18:03:03,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 18:03:03,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:03:03,268 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 41 states. [2018-12-03 18:03:03,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:03,737 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2018-12-03 18:03:03,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 18:03:03,737 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 41 [2018-12-03 18:03:03,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:03,738 INFO L225 Difference]: With dead ends: 72 [2018-12-03 18:03:03,738 INFO L226 Difference]: Without dead ends: 43 [2018-12-03 18:03:03,739 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 43 SyntacticMatches, 25 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 912 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=703, Invalid=2159, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 18:03:03,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-12-03 18:03:03,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-12-03 18:03:03,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-12-03 18:03:03,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2018-12-03 18:03:03,746 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 41 [2018-12-03 18:03:03,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:03,746 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2018-12-03 18:03:03,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 18:03:03,746 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2018-12-03 18:03:03,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-12-03 18:03:03,747 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:03,747 INFO L402 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1] [2018-12-03 18:03:03,747 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:03,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:03,748 INFO L82 PathProgramCache]: Analyzing trace with hash 1073842142, now seen corresponding path program 24 times [2018-12-03 18:03:03,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:03,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:03,751 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:03,751 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:03,751 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:03,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:04,814 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:04,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:04,815 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:04,815 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:04,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:04,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:04,815 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 18:03:04,824 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:04,825 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:04,859 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:04,859 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:04,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:04,882 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:04,882 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:05,051 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 91 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:05,071 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:05,071 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 18 [2018-12-03 18:03:05,071 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:05,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-12-03 18:03:05,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-12-03 18:03:05,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=201, Unknown=0, NotChecked=0, Total=342 [2018-12-03 18:03:05,072 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 19 states. [2018-12-03 18:03:05,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:05,307 INFO L93 Difference]: Finished difference Result 51 states and 52 transitions. [2018-12-03 18:03:05,307 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 18:03:05,308 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2018-12-03 18:03:05,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:05,309 INFO L225 Difference]: With dead ends: 51 [2018-12-03 18:03:05,309 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 18:03:05,310 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 68 SyntacticMatches, 26 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 18:03:05,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 18:03:05,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2018-12-03 18:03:05,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-12-03 18:03:05,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2018-12-03 18:03:05,320 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2018-12-03 18:03:05,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:05,320 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2018-12-03 18:03:05,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-12-03 18:03:05,320 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2018-12-03 18:03:05,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-12-03 18:03:05,321 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:05,321 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1] [2018-12-03 18:03:05,321 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:05,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:05,322 INFO L82 PathProgramCache]: Analyzing trace with hash 1170080634, now seen corresponding path program 25 times [2018-12-03 18:03:05,322 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:05,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:05,323 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:05,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:05,323 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:05,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:05,889 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:05,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:05,890 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:05,890 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:05,890 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:05,890 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:05,890 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 18:03:05,899 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:05,899 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:05,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:05,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:06,452 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:06,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:06,880 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 182 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:06,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:06,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 43 [2018-12-03 18:03:06,903 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:06,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:03:06,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:03:06,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:03:06,904 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 44 states. [2018-12-03 18:03:07,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:07,367 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2018-12-03 18:03:07,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 18:03:07,368 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 44 [2018-12-03 18:03:07,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:07,368 INFO L225 Difference]: With dead ends: 77 [2018-12-03 18:03:07,368 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 18:03:07,370 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 46 SyntacticMatches, 27 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1066 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=806, Invalid=2500, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 18:03:07,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 18:03:07,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-12-03 18:03:07,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 18:03:07,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-12-03 18:03:07,377 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 44 [2018-12-03 18:03:07,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:07,377 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-12-03 18:03:07,377 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:03:07,377 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-12-03 18:03:07,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 18:03:07,377 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:07,377 INFO L402 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1] [2018-12-03 18:03:07,378 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:07,378 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:07,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1190416335, now seen corresponding path program 26 times [2018-12-03 18:03:07,378 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:07,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:07,379 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:07,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:07,379 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:07,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:07,640 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:07,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:07,640 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:07,641 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:07,641 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:07,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:07,641 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 18:03:07,651 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:07,651 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:07,690 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2018-12-03 18:03:07,690 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:07,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:07,709 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:07,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:07,949 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 105 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:07,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:07,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 19 [2018-12-03 18:03:07,970 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:07,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 18:03:07,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 18:03:07,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=222, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:03:07,971 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 20 states. [2018-12-03 18:03:08,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:08,225 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2018-12-03 18:03:08,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 18:03:08,226 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-12-03 18:03:08,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:08,227 INFO L225 Difference]: With dead ends: 54 [2018-12-03 18:03:08,227 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 18:03:08,228 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 73 SyntacticMatches, 28 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=444, Invalid=746, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:03:08,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 18:03:08,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2018-12-03 18:03:08,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 18:03:08,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2018-12-03 18:03:08,236 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 45 [2018-12-03 18:03:08,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:08,237 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2018-12-03 18:03:08,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 18:03:08,237 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2018-12-03 18:03:08,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-12-03 18:03:08,237 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:08,237 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1] [2018-12-03 18:03:08,238 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:08,238 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:08,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1528863987, now seen corresponding path program 27 times [2018-12-03 18:03:08,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:08,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:08,239 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:08,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:08,239 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:08,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:08,656 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:08,657 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:08,657 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:08,657 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:08,657 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:08,658 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:08,658 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 18:03:08,667 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:08,668 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:08,710 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:08,711 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:08,713 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:09,129 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:09,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:09,417 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 210 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:09,437 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:09,437 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 46 [2018-12-03 18:03:09,437 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:09,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:03:09,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:03:09,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:03:09,439 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 47 states. [2018-12-03 18:03:09,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:09,913 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2018-12-03 18:03:09,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 18:03:09,913 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 47 [2018-12-03 18:03:09,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:09,913 INFO L225 Difference]: With dead ends: 82 [2018-12-03 18:03:09,914 INFO L226 Difference]: Without dead ends: 49 [2018-12-03 18:03:09,915 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 49 SyntacticMatches, 29 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=916, Invalid=2866, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:03:09,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-12-03 18:03:09,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-12-03 18:03:09,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-12-03 18:03:09,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-12-03 18:03:09,923 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2018-12-03 18:03:09,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:09,923 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-12-03 18:03:09,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:03:09,924 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-12-03 18:03:09,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-12-03 18:03:09,924 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:09,924 INFO L402 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1] [2018-12-03 18:03:09,925 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:09,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:09,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1594530058, now seen corresponding path program 28 times [2018-12-03 18:03:09,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:09,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:09,926 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:09,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:09,926 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:09,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:10,144 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:10,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:10,145 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:10,145 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:10,145 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:10,145 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:10,145 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 18:03:10,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:10,155 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:10,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:10,193 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:10,226 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:10,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:10,423 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 120 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:10,443 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:10,443 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 20 [2018-12-03 18:03:10,443 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:10,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-12-03 18:03:10,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-12-03 18:03:10,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=244, Unknown=0, NotChecked=0, Total=420 [2018-12-03 18:03:10,444 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 21 states. [2018-12-03 18:03:10,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:10,720 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2018-12-03 18:03:10,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 18:03:10,720 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 48 [2018-12-03 18:03:10,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:10,721 INFO L225 Difference]: With dead ends: 57 [2018-12-03 18:03:10,721 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 18:03:10,723 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 78 SyntacticMatches, 30 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 527 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=497, Invalid=835, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 18:03:10,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 18:03:10,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 51. [2018-12-03 18:03:10,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-12-03 18:03:10,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2018-12-03 18:03:10,732 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2018-12-03 18:03:10,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:10,732 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2018-12-03 18:03:10,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-12-03 18:03:10,732 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2018-12-03 18:03:10,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-12-03 18:03:10,733 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:10,733 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1] [2018-12-03 18:03:10,733 INFO L423 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:10,733 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:10,733 INFO L82 PathProgramCache]: Analyzing trace with hash 959872146, now seen corresponding path program 29 times [2018-12-03 18:03:10,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:10,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:10,735 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:10,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:10,735 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:10,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:11,252 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:11,252 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:11,253 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:11,253 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:11,253 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:11,253 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:11,253 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 18:03:11,262 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:11,262 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:11,503 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-12-03 18:03:11,503 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:11,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:11,965 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:11,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:12,270 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 240 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:12,290 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:12,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 49 [2018-12-03 18:03:12,290 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:12,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:03:12,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:03:12,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:03:12,292 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 50 states. [2018-12-03 18:03:12,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:12,874 INFO L93 Difference]: Finished difference Result 87 states and 89 transitions. [2018-12-03 18:03:12,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 18:03:12,874 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 50 [2018-12-03 18:03:12,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:12,875 INFO L225 Difference]: With dead ends: 87 [2018-12-03 18:03:12,875 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 18:03:12,877 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 52 SyntacticMatches, 31 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1410 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1033, Invalid=3257, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 18:03:12,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 18:03:12,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-12-03 18:03:12,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 18:03:12,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-12-03 18:03:12,885 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 50 [2018-12-03 18:03:12,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:12,885 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-12-03 18:03:12,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:03:12,885 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-12-03 18:03:12,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 18:03:12,885 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:12,885 INFO L402 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1] [2018-12-03 18:03:12,886 INFO L423 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:12,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:12,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1087929335, now seen corresponding path program 30 times [2018-12-03 18:03:12,886 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:12,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:12,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:12,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:12,887 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:12,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:13,290 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:13,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:13,290 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:13,290 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:13,290 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:13,291 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:13,291 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 18:03:13,300 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:13,301 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:13,338 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:13,339 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:13,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:13,370 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:13,371 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:13,632 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 136 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:13,652 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:13,653 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 21 [2018-12-03 18:03:13,653 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:13,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 18:03:13,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 18:03:13,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=267, Unknown=0, NotChecked=0, Total=462 [2018-12-03 18:03:13,654 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 22 states. [2018-12-03 18:03:14,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:14,023 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2018-12-03 18:03:14,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 18:03:14,024 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2018-12-03 18:03:14,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:14,024 INFO L225 Difference]: With dead ends: 60 [2018-12-03 18:03:14,025 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 18:03:14,026 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 32 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=553, Invalid=929, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 18:03:14,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 18:03:14,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-12-03 18:03:14,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-03 18:03:14,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2018-12-03 18:03:14,037 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2018-12-03 18:03:14,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:14,038 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2018-12-03 18:03:14,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 18:03:14,038 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2018-12-03 18:03:14,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-12-03 18:03:14,038 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:14,038 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1] [2018-12-03 18:03:14,039 INFO L423 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:14,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:14,039 INFO L82 PathProgramCache]: Analyzing trace with hash -1823104795, now seen corresponding path program 31 times [2018-12-03 18:03:14,039 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:14,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:14,040 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:14,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:14,040 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:14,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:15,313 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:15,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:15,314 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:15,314 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:15,314 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:15,314 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:15,315 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 18:03:15,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:15,325 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:15,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:15,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:15,869 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:15,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:16,221 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 272 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:16,241 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:16,241 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 52 [2018-12-03 18:03:16,241 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:16,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 18:03:16,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 18:03:16,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:03:16,243 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 53 states. [2018-12-03 18:03:17,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:17,195 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2018-12-03 18:03:17,196 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 18:03:17,196 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 53 [2018-12-03 18:03:17,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:17,197 INFO L225 Difference]: With dead ends: 92 [2018-12-03 18:03:17,197 INFO L226 Difference]: Without dead ends: 55 [2018-12-03 18:03:17,200 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 55 SyntacticMatches, 33 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1600 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1157, Invalid=3673, Unknown=0, NotChecked=0, Total=4830 [2018-12-03 18:03:17,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-12-03 18:03:17,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-12-03 18:03:17,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-12-03 18:03:17,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-12-03 18:03:17,208 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 53 [2018-12-03 18:03:17,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:17,209 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-12-03 18:03:17,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 18:03:17,209 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-12-03 18:03:17,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-12-03 18:03:17,210 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:17,210 INFO L402 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1] [2018-12-03 18:03:17,210 INFO L423 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:17,210 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:17,210 INFO L82 PathProgramCache]: Analyzing trace with hash 2133414414, now seen corresponding path program 32 times [2018-12-03 18:03:17,210 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:17,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:17,211 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:17,211 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:17,212 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:17,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:17,465 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:17,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:17,466 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:17,466 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:17,466 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:17,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:17,466 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 18:03:17,474 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:17,474 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:17,526 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2018-12-03 18:03:17,527 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:17,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:17,564 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:17,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:17,807 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 153 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:17,828 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:17,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 22 [2018-12-03 18:03:17,829 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:17,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-12-03 18:03:17,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-12-03 18:03:17,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=291, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:03:17,830 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 23 states. [2018-12-03 18:03:18,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:18,153 INFO L93 Difference]: Finished difference Result 63 states and 64 transitions. [2018-12-03 18:03:18,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 18:03:18,154 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2018-12-03 18:03:18,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:18,155 INFO L225 Difference]: With dead ends: 63 [2018-12-03 18:03:18,155 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 18:03:18,156 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 88 SyntacticMatches, 34 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 665 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=612, Invalid=1028, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:03:18,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 18:03:18,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 57. [2018-12-03 18:03:18,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-12-03 18:03:18,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-12-03 18:03:18,165 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2018-12-03 18:03:18,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:18,166 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-12-03 18:03:18,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-12-03 18:03:18,166 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-12-03 18:03:18,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-12-03 18:03:18,166 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:18,166 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1] [2018-12-03 18:03:18,167 INFO L423 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:18,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:18,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1511784874, now seen corresponding path program 33 times [2018-12-03 18:03:18,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:18,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:18,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:18,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:18,168 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:18,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:18,691 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:18,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:18,691 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:18,691 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:18,691 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:18,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:18,692 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 18:03:18,700 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:18,700 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:18,740 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:18,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:18,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:19,297 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:19,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:19,668 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 306 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:19,688 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:19,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 55 [2018-12-03 18:03:19,688 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:19,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 18:03:19,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 18:03:19,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:03:19,690 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 56 states. [2018-12-03 18:03:20,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:20,646 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2018-12-03 18:03:20,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 18:03:20,646 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 56 [2018-12-03 18:03:20,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:20,646 INFO L225 Difference]: With dead ends: 97 [2018-12-03 18:03:20,647 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 18:03:20,647 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 58 SyntacticMatches, 35 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1802 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1288, Invalid=4114, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:03:20,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 18:03:20,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-12-03 18:03:20,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 18:03:20,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-12-03 18:03:20,659 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 56 [2018-12-03 18:03:20,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:20,660 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-12-03 18:03:20,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 18:03:20,660 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-12-03 18:03:20,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-12-03 18:03:20,661 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:20,661 INFO L402 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1] [2018-12-03 18:03:20,661 INFO L423 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:20,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:20,661 INFO L82 PathProgramCache]: Analyzing trace with hash -906931231, now seen corresponding path program 34 times [2018-12-03 18:03:20,661 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:20,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:20,662 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:20,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:20,662 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:20,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:20,953 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:20,953 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:20,953 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:20,953 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:20,953 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:20,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:20,954 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:03:20,963 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:20,963 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:21,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:21,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:21,048 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:21,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:21,548 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 171 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:21,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:21,570 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 23 [2018-12-03 18:03:21,570 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:21,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 18:03:21,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 18:03:21,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2018-12-03 18:03:21,571 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 24 states. [2018-12-03 18:03:21,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:21,949 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2018-12-03 18:03:21,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 18:03:21,949 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 57 [2018-12-03 18:03:21,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:21,950 INFO L225 Difference]: With dead ends: 66 [2018-12-03 18:03:21,950 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 18:03:21,950 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 36 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 740 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=674, Invalid=1132, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 18:03:21,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 18:03:21,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2018-12-03 18:03:21,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 18:03:21,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2018-12-03 18:03:21,961 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 57 [2018-12-03 18:03:21,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:21,962 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2018-12-03 18:03:21,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 18:03:21,962 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2018-12-03 18:03:21,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 18:03:21,962 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:21,962 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1] [2018-12-03 18:03:21,963 INFO L423 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:21,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:21,963 INFO L82 PathProgramCache]: Analyzing trace with hash 317381309, now seen corresponding path program 35 times [2018-12-03 18:03:21,963 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:21,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:21,964 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:21,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:21,964 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:21,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:22,549 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:22,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:22,549 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:22,549 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:22,550 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:22,550 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:22,550 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 18:03:22,559 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:22,559 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:22,623 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-12-03 18:03:22,623 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:22,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:23,289 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:23,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:23,712 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 342 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:23,732 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:23,732 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 58 [2018-12-03 18:03:23,732 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:23,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:03:23,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:03:23,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:03:23,733 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 59 states. [2018-12-03 18:03:24,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:24,617 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2018-12-03 18:03:24,617 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 18:03:24,617 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 59 [2018-12-03 18:03:24,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:24,618 INFO L225 Difference]: With dead ends: 102 [2018-12-03 18:03:24,618 INFO L226 Difference]: Without dead ends: 61 [2018-12-03 18:03:24,619 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 61 SyntacticMatches, 37 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2016 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1426, Invalid=4580, Unknown=0, NotChecked=0, Total=6006 [2018-12-03 18:03:24,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-12-03 18:03:24,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-12-03 18:03:24,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-12-03 18:03:24,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-12-03 18:03:24,631 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2018-12-03 18:03:24,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:24,631 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-12-03 18:03:24,631 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:03:24,631 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-12-03 18:03:24,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-12-03 18:03:24,632 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:24,632 INFO L402 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1] [2018-12-03 18:03:24,632 INFO L423 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:24,632 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:24,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1012222246, now seen corresponding path program 36 times [2018-12-03 18:03:24,632 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:24,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:24,633 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:24,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:24,634 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:24,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:25,081 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:25,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:25,081 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:25,081 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:25,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:25,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:25,082 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 18:03:25,092 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:25,092 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:25,136 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:25,136 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:25,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:25,287 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:25,287 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:25,575 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 190 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:25,597 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:25,597 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 24 [2018-12-03 18:03:25,597 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:25,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-12-03 18:03:25,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-12-03 18:03:25,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=342, Unknown=0, NotChecked=0, Total=600 [2018-12-03 18:03:25,598 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 25 states. [2018-12-03 18:03:26,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:26,004 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-12-03 18:03:26,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 18:03:26,005 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 60 [2018-12-03 18:03:26,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:26,006 INFO L225 Difference]: With dead ends: 69 [2018-12-03 18:03:26,006 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 18:03:26,007 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 98 SyntacticMatches, 38 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 819 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=739, Invalid=1241, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 18:03:26,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 18:03:26,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2018-12-03 18:03:26,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-12-03 18:03:26,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2018-12-03 18:03:26,025 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 60 [2018-12-03 18:03:26,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:26,025 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2018-12-03 18:03:26,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-12-03 18:03:26,025 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2018-12-03 18:03:26,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-12-03 18:03:26,026 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:26,026 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 19, 1, 1, 1, 1] [2018-12-03 18:03:26,026 INFO L423 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:26,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:26,027 INFO L82 PathProgramCache]: Analyzing trace with hash 2082902722, now seen corresponding path program 37 times [2018-12-03 18:03:26,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:26,027 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:26,028 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:26,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:26,028 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:26,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:27,015 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:27,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:27,016 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:27,016 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:27,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:27,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:27,016 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 18:03:27,026 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:27,026 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:27,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:27,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:28,384 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:28,385 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:28,840 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 380 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:28,860 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:28,860 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 61 [2018-12-03 18:03:28,861 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:28,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 18:03:28,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 18:03:28,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:03:28,862 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 62 states. [2018-12-03 18:03:29,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:29,813 INFO L93 Difference]: Finished difference Result 107 states and 109 transitions. [2018-12-03 18:03:29,813 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 18:03:29,813 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 62 [2018-12-03 18:03:29,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:29,814 INFO L225 Difference]: With dead ends: 107 [2018-12-03 18:03:29,814 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 18:03:29,815 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 64 SyntacticMatches, 39 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2242 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1571, Invalid=5071, Unknown=0, NotChecked=0, Total=6642 [2018-12-03 18:03:29,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 18:03:29,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-12-03 18:03:29,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-12-03 18:03:29,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-12-03 18:03:29,825 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 62 [2018-12-03 18:03:29,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:29,825 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-12-03 18:03:29,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 18:03:29,825 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-12-03 18:03:29,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-12-03 18:03:29,826 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:29,826 INFO L402 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1] [2018-12-03 18:03:29,826 INFO L423 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:29,826 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:29,826 INFO L82 PathProgramCache]: Analyzing trace with hash 346890169, now seen corresponding path program 38 times [2018-12-03 18:03:29,826 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:29,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:29,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:29,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:29,827 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:29,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:30,109 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:30,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:30,110 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:30,110 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:30,110 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:30,110 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:30,110 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 18:03:30,120 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:30,120 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:30,182 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2018-12-03 18:03:30,182 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:30,185 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:30,238 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:30,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:30,561 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 210 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:30,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:30,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 25 [2018-12-03 18:03:30,583 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:30,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:03:30,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:03:30,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:03:30,584 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 26 states. [2018-12-03 18:03:30,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:30,973 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2018-12-03 18:03:30,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 18:03:30,974 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 63 [2018-12-03 18:03:30,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:30,975 INFO L225 Difference]: With dead ends: 72 [2018-12-03 18:03:30,975 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 18:03:30,976 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 103 SyntacticMatches, 40 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=807, Invalid=1355, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:03:30,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 18:03:30,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2018-12-03 18:03:30,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 18:03:30,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2018-12-03 18:03:30,990 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 63 [2018-12-03 18:03:30,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:30,990 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2018-12-03 18:03:30,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:03:30,990 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2018-12-03 18:03:30,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 18:03:30,990 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:30,991 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 20, 1, 1, 1, 1] [2018-12-03 18:03:30,991 INFO L423 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:30,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:30,991 INFO L82 PathProgramCache]: Analyzing trace with hash -1646063467, now seen corresponding path program 39 times [2018-12-03 18:03:30,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:30,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:30,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:30,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:30,992 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:31,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:31,743 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:31,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:31,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:31,743 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:31,743 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:31,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:31,744 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 18:03:31,753 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:31,753 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:31,802 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:31,802 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:31,805 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:32,668 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:32,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:33,264 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 420 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:33,284 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:33,284 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 64 [2018-12-03 18:03:33,284 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:33,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 18:03:33,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 18:03:33,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:03:33,285 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 65 states. [2018-12-03 18:03:34,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:34,768 INFO L93 Difference]: Finished difference Result 112 states and 114 transitions. [2018-12-03 18:03:34,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 18:03:34,768 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 65 [2018-12-03 18:03:34,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:34,769 INFO L225 Difference]: With dead ends: 112 [2018-12-03 18:03:34,769 INFO L226 Difference]: Without dead ends: 67 [2018-12-03 18:03:34,770 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 67 SyntacticMatches, 41 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2480 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1723, Invalid=5587, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:03:34,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-12-03 18:03:34,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-12-03 18:03:34,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-12-03 18:03:34,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-12-03 18:03:34,785 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 65 [2018-12-03 18:03:34,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:34,786 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-12-03 18:03:34,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 18:03:34,786 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-12-03 18:03:34,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-12-03 18:03:34,786 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:34,787 INFO L402 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1] [2018-12-03 18:03:34,787 INFO L423 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:34,787 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:34,787 INFO L82 PathProgramCache]: Analyzing trace with hash 800148542, now seen corresponding path program 40 times [2018-12-03 18:03:34,787 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:34,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:34,788 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:34,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:34,788 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:34,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:35,323 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:35,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:35,323 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:35,323 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:35,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:35,324 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:35,324 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 18:03:35,334 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:35,334 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:35,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:35,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:35,468 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:35,469 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:35,955 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 231 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:35,974 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:35,974 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 26 [2018-12-03 18:03:35,975 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:35,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-12-03 18:03:35,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-12-03 18:03:35,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=397, Unknown=0, NotChecked=0, Total=702 [2018-12-03 18:03:35,976 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 27 states. [2018-12-03 18:03:36,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:36,373 INFO L93 Difference]: Finished difference Result 75 states and 76 transitions. [2018-12-03 18:03:36,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 18:03:36,374 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 66 [2018-12-03 18:03:36,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:36,375 INFO L225 Difference]: With dead ends: 75 [2018-12-03 18:03:36,375 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 18:03:36,376 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 108 SyntacticMatches, 42 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=878, Invalid=1474, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 18:03:36,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 18:03:36,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 69. [2018-12-03 18:03:36,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-12-03 18:03:36,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-12-03 18:03:36,393 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 66 [2018-12-03 18:03:36,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:36,393 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-12-03 18:03:36,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-12-03 18:03:36,394 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-12-03 18:03:36,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-12-03 18:03:36,394 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:36,394 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 21, 1, 1, 1, 1] [2018-12-03 18:03:36,394 INFO L423 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:36,395 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:36,395 INFO L82 PathProgramCache]: Analyzing trace with hash 143536090, now seen corresponding path program 41 times [2018-12-03 18:03:36,395 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:36,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:36,396 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:36,396 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:36,396 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:36,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:37,462 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:37,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:37,463 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:37,463 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:37,463 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:37,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:37,463 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 18:03:37,471 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:37,471 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:37,538 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-12-03 18:03:37,539 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:37,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:38,340 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:38,340 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:38,917 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 462 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:38,937 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:38,937 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 67 [2018-12-03 18:03:38,937 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:38,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 18:03:38,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 18:03:38,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 18:03:38,939 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 68 states. [2018-12-03 18:03:39,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:39,834 INFO L93 Difference]: Finished difference Result 117 states and 119 transitions. [2018-12-03 18:03:39,834 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-12-03 18:03:39,834 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 68 [2018-12-03 18:03:39,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:39,835 INFO L225 Difference]: With dead ends: 117 [2018-12-03 18:03:39,836 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 18:03:39,836 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 70 SyntacticMatches, 43 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2730 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1882, Invalid=6128, Unknown=0, NotChecked=0, Total=8010 [2018-12-03 18:03:39,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 18:03:39,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-12-03 18:03:39,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 18:03:39,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2018-12-03 18:03:39,850 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 68 [2018-12-03 18:03:39,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:39,850 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2018-12-03 18:03:39,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 18:03:39,851 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2018-12-03 18:03:39,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 18:03:39,851 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:39,851 INFO L402 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1] [2018-12-03 18:03:39,851 INFO L423 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:39,852 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:39,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1759582319, now seen corresponding path program 42 times [2018-12-03 18:03:39,852 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:39,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:39,853 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:39,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:39,853 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:39,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:40,289 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:40,289 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:40,290 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:40,290 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:40,290 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:40,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:40,290 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 18:03:40,299 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:40,300 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:40,356 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:40,356 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:40,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:40,394 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:40,395 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:40,782 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 253 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:40,802 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:40,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 27 [2018-12-03 18:03:40,803 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:40,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 18:03:40,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 18:03:40,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=426, Unknown=0, NotChecked=0, Total=756 [2018-12-03 18:03:40,804 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand 28 states. [2018-12-03 18:03:41,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:41,226 INFO L93 Difference]: Finished difference Result 78 states and 79 transitions. [2018-12-03 18:03:41,226 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 18:03:41,226 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 69 [2018-12-03 18:03:41,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:41,227 INFO L225 Difference]: With dead ends: 78 [2018-12-03 18:03:41,227 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 18:03:41,228 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 113 SyntacticMatches, 44 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1080 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=952, Invalid=1598, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 18:03:41,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 18:03:41,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2018-12-03 18:03:41,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-03 18:03:41,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2018-12-03 18:03:41,242 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 69 [2018-12-03 18:03:41,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:41,243 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2018-12-03 18:03:41,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 18:03:41,243 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2018-12-03 18:03:41,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-12-03 18:03:41,243 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:41,243 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 22, 1, 1, 1, 1] [2018-12-03 18:03:41,244 INFO L423 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:41,244 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:41,244 INFO L82 PathProgramCache]: Analyzing trace with hash 1258439277, now seen corresponding path program 43 times [2018-12-03 18:03:41,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:41,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:41,245 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:41,245 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:41,245 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:41,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:42,133 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:42,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:42,134 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:42,134 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:42,134 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:42,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:42,134 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 18:03:42,142 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:42,143 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:42,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:42,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:43,156 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:43,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:43,754 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 506 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:43,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:43,775 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 70 [2018-12-03 18:03:43,775 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:43,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 18:03:43,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 18:03:43,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:03:43,776 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 71 states. [2018-12-03 18:03:44,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:44,558 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2018-12-03 18:03:44,559 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 18:03:44,559 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 71 [2018-12-03 18:03:44,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:44,560 INFO L225 Difference]: With dead ends: 122 [2018-12-03 18:03:44,560 INFO L226 Difference]: Without dead ends: 73 [2018-12-03 18:03:44,561 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 73 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 18:03:44,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-12-03 18:03:44,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2018-12-03 18:03:44,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-12-03 18:03:44,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2018-12-03 18:03:44,576 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 71 [2018-12-03 18:03:44,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:44,576 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2018-12-03 18:03:44,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 18:03:44,577 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2018-12-03 18:03:44,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-12-03 18:03:44,577 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:44,577 INFO L402 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1] [2018-12-03 18:03:44,578 INFO L423 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:44,578 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:44,578 INFO L82 PathProgramCache]: Analyzing trace with hash -973776042, now seen corresponding path program 44 times [2018-12-03 18:03:44,578 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:44,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:44,579 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:44,579 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:44,579 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:44,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:44,925 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:44,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:44,926 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:44,926 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:44,926 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:44,926 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:44,926 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 18:03:44,938 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:44,938 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:45,009 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2018-12-03 18:03:45,010 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:45,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:45,154 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:45,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:45,641 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 276 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:45,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:45,660 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 28 [2018-12-03 18:03:45,660 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:45,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-12-03 18:03:45,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-12-03 18:03:45,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=456, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:03:45,661 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand 29 states. [2018-12-03 18:03:46,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:46,113 INFO L93 Difference]: Finished difference Result 81 states and 82 transitions. [2018-12-03 18:03:46,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 18:03:46,114 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2018-12-03 18:03:46,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:46,114 INFO L225 Difference]: With dead ends: 81 [2018-12-03 18:03:46,115 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 18:03:46,115 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 118 SyntacticMatches, 46 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1175 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1029, Invalid=1727, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:03:46,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 18:03:46,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 75. [2018-12-03 18:03:46,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-12-03 18:03:46,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-12-03 18:03:46,131 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 72 [2018-12-03 18:03:46,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:46,132 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-12-03 18:03:46,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-12-03 18:03:46,132 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-12-03 18:03:46,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-12-03 18:03:46,132 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:46,132 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 23, 1, 1, 1, 1] [2018-12-03 18:03:46,132 INFO L423 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:46,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:46,133 INFO L82 PathProgramCache]: Analyzing trace with hash 504027378, now seen corresponding path program 45 times [2018-12-03 18:03:46,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:46,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:46,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:46,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:46,134 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:46,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:47,058 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:47,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:47,059 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:47,059 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:47,059 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:47,059 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:47,059 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 18:03:47,069 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:03:47,069 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:03:47,126 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:03:47,126 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:47,132 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:48,369 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:48,369 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:49,434 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 552 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:49,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:49,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 73 [2018-12-03 18:03:49,453 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:49,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 18:03:49,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 18:03:49,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:03:49,455 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 74 states. [2018-12-03 18:03:50,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:50,809 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2018-12-03 18:03:50,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 18:03:50,810 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 74 [2018-12-03 18:03:50,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:50,810 INFO L225 Difference]: With dead ends: 127 [2018-12-03 18:03:50,810 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 18:03:50,811 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 76 SyntacticMatches, 47 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=2221, Invalid=7285, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:03:50,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 18:03:50,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-12-03 18:03:50,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 18:03:50,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2018-12-03 18:03:50,826 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 74 [2018-12-03 18:03:50,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:50,826 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2018-12-03 18:03:50,826 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 18:03:50,826 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2018-12-03 18:03:50,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 18:03:50,827 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:50,827 INFO L402 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1] [2018-12-03 18:03:50,827 INFO L423 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:50,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:50,827 INFO L82 PathProgramCache]: Analyzing trace with hash -443896983, now seen corresponding path program 46 times [2018-12-03 18:03:50,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:50,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:50,828 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:50,828 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:50,828 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:50,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:51,362 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:51,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:51,362 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:51,363 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:51,363 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:51,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:51,363 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 18:03:51,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:51,371 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:03:51,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:51,433 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:51,481 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:51,481 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:52,050 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 300 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:52,070 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:52,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 29 [2018-12-03 18:03:52,070 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:52,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 18:03:52,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 18:03:52,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=487, Unknown=0, NotChecked=0, Total=870 [2018-12-03 18:03:52,071 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand 30 states. [2018-12-03 18:03:52,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:52,627 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2018-12-03 18:03:52,627 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 18:03:52,627 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 75 [2018-12-03 18:03:52,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:52,628 INFO L225 Difference]: With dead ends: 84 [2018-12-03 18:03:52,628 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 18:03:52,629 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 123 SyntacticMatches, 48 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1109, Invalid=1861, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 18:03:52,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 18:03:52,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2018-12-03 18:03:52,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-03 18:03:52,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 79 transitions. [2018-12-03 18:03:52,646 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 79 transitions. Word has length 75 [2018-12-03 18:03:52,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:52,646 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 79 transitions. [2018-12-03 18:03:52,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 18:03:52,646 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 79 transitions. [2018-12-03 18:03:52,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-12-03 18:03:52,646 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:52,646 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 24, 1, 1, 1, 1] [2018-12-03 18:03:52,647 INFO L423 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:52,647 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:52,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1383305147, now seen corresponding path program 47 times [2018-12-03 18:03:52,647 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:52,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:52,648 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:03:52,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:52,648 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:52,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:03:53,662 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:53,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:53,662 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:03:53,662 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:03:53,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:03:53,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:03:53,663 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 18:03:53,671 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:03:53,672 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:03:53,754 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-12-03 18:03:53,754 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:03:53,758 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:03:54,831 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:54,831 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:03:55,546 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 600 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:03:55,568 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:03:55,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 76 [2018-12-03 18:03:55,568 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:03:55,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-12-03 18:03:55,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-12-03 18:03:55,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:03:55,570 INFO L87 Difference]: Start difference. First operand 78 states and 79 transitions. Second operand 77 states. [2018-12-03 18:03:57,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:03:57,032 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2018-12-03 18:03:57,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 18:03:57,032 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 77 [2018-12-03 18:03:57,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:03:57,033 INFO L225 Difference]: With dead ends: 132 [2018-12-03 18:03:57,033 INFO L226 Difference]: Without dead ends: 79 [2018-12-03 18:03:57,034 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 79 SyntacticMatches, 49 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3552 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2401, Invalid=7901, Unknown=0, NotChecked=0, Total=10302 [2018-12-03 18:03:57,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-12-03 18:03:57,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-12-03 18:03:57,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-12-03 18:03:57,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-12-03 18:03:57,051 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 77 [2018-12-03 18:03:57,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:03:57,051 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-12-03 18:03:57,051 INFO L481 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-12-03 18:03:57,051 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-12-03 18:03:57,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2018-12-03 18:03:57,052 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:03:57,052 INFO L402 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1] [2018-12-03 18:03:57,052 INFO L423 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:03:57,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:03:57,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1587972498, now seen corresponding path program 48 times [2018-12-03 18:03:57,052 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:03:57,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:57,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:03:57,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:03:57,053 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:03:57,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:00,071 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:00,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:00,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:00,072 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:00,072 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:00,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:00,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:04:00,081 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:04:00,081 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:04:00,145 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:04:00,145 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:00,149 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:00,192 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:00,192 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:00,838 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:00,857 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:00,858 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 30 [2018-12-03 18:04:00,858 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:00,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-12-03 18:04:00,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-12-03 18:04:00,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=519, Unknown=0, NotChecked=0, Total=930 [2018-12-03 18:04:00,859 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 31 states. [2018-12-03 18:04:01,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:01,599 INFO L93 Difference]: Finished difference Result 87 states and 88 transitions. [2018-12-03 18:04:01,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 18:04:01,600 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 78 [2018-12-03 18:04:01,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:01,600 INFO L225 Difference]: With dead ends: 87 [2018-12-03 18:04:01,600 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 18:04:01,601 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 128 SyntacticMatches, 50 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1377 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1192, Invalid=2000, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 18:04:01,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 18:04:01,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 81. [2018-12-03 18:04:01,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2018-12-03 18:04:01,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2018-12-03 18:04:01,619 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 78 [2018-12-03 18:04:01,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:01,619 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2018-12-03 18:04:01,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-12-03 18:04:01,619 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2018-12-03 18:04:01,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2018-12-03 18:04:01,620 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:01,620 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 25, 1, 1, 1, 1] [2018-12-03 18:04:01,620 INFO L423 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:01,620 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:01,620 INFO L82 PathProgramCache]: Analyzing trace with hash -1328247286, now seen corresponding path program 49 times [2018-12-03 18:04:01,621 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:01,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:01,621 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:01,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:01,621 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:01,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:03,901 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:03,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:03,902 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:03,902 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:03,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:03,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:03,902 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 18:04:03,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:03,911 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:04:03,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:03,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:05,090 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:05,090 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:05,866 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 650 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:05,887 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:05,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 79 [2018-12-03 18:04:05,887 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:05,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 18:04:05,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 18:04:05,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:04:05,889 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand 80 states. [2018-12-03 18:04:07,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:07,465 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2018-12-03 18:04:07,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 18:04:07,465 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 80 [2018-12-03 18:04:07,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:07,466 INFO L225 Difference]: With dead ends: 137 [2018-12-03 18:04:07,466 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 18:04:07,467 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 82 SyntacticMatches, 51 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3850 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=2588, Invalid=8542, Unknown=0, NotChecked=0, Total=11130 [2018-12-03 18:04:07,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 18:04:07,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-12-03 18:04:07,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-12-03 18:04:07,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-12-03 18:04:07,487 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 80 [2018-12-03 18:04:07,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:07,487 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-12-03 18:04:07,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 18:04:07,487 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-12-03 18:04:07,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-12-03 18:04:07,488 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:07,488 INFO L402 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1] [2018-12-03 18:04:07,488 INFO L423 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:07,488 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:07,489 INFO L82 PathProgramCache]: Analyzing trace with hash 280259393, now seen corresponding path program 50 times [2018-12-03 18:04:07,489 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:07,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:07,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:07,490 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:07,490 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:07,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:08,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:08,279 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:08,279 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:08,280 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:08,280 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:08,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:08,280 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:04:08,297 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:08,297 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:08,446 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2018-12-03 18:04:08,446 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:08,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:08,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:08,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:09,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:09,155 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:09,155 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 31 [2018-12-03 18:04:09,155 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:09,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:04:09,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:04:09,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=440, Invalid=552, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:04:09,157 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 32 states. [2018-12-03 18:04:10,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:10,445 INFO L93 Difference]: Finished difference Result 90 states and 91 transitions. [2018-12-03 18:04:10,445 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 18:04:10,445 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 81 [2018-12-03 18:04:10,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:10,446 INFO L225 Difference]: With dead ends: 90 [2018-12-03 18:04:10,447 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 18:04:10,447 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 133 SyntacticMatches, 52 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1484 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1278, Invalid=2144, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:04:10,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 18:04:10,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2018-12-03 18:04:10,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 18:04:10,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 85 transitions. [2018-12-03 18:04:10,468 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 85 transitions. Word has length 81 [2018-12-03 18:04:10,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:10,468 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 85 transitions. [2018-12-03 18:04:10,468 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:04:10,468 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 85 transitions. [2018-12-03 18:04:10,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 18:04:10,469 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:10,469 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 26, 1, 1, 1, 1] [2018-12-03 18:04:10,469 INFO L423 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:10,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:10,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1253729763, now seen corresponding path program 51 times [2018-12-03 18:04:10,470 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:10,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:10,471 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:10,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:10,471 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:10,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:11,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:11,639 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:11,639 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:11,640 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:11,640 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:11,640 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:11,640 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 18:04:11,653 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:04:11,653 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:04:11,718 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:04:11,719 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:11,723 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:13,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:13,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:14,016 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 702 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:14,036 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:14,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 82 [2018-12-03 18:04:14,036 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:14,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-12-03 18:04:14,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-12-03 18:04:14,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 18:04:14,038 INFO L87 Difference]: Start difference. First operand 84 states and 85 transitions. Second operand 83 states. [2018-12-03 18:04:15,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:15,817 INFO L93 Difference]: Finished difference Result 142 states and 144 transitions. [2018-12-03 18:04:15,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 18:04:15,817 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 83 [2018-12-03 18:04:15,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:15,817 INFO L225 Difference]: With dead ends: 142 [2018-12-03 18:04:15,818 INFO L226 Difference]: Without dead ends: 85 [2018-12-03 18:04:15,819 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 85 SyntacticMatches, 53 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4160 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2782, Invalid=9208, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:04:15,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-12-03 18:04:15,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2018-12-03 18:04:15,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-12-03 18:04:15,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2018-12-03 18:04:15,836 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 83 [2018-12-03 18:04:15,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:15,837 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2018-12-03 18:04:15,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-12-03 18:04:15,837 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2018-12-03 18:04:15,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-12-03 18:04:15,837 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:15,837 INFO L402 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1] [2018-12-03 18:04:15,837 INFO L423 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:15,838 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:15,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1181377146, now seen corresponding path program 52 times [2018-12-03 18:04:15,838 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:15,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:15,839 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:15,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:15,839 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:15,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:16,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:16,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:16,685 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:16,685 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:16,686 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:16,686 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:16,686 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 18:04:16,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:16,696 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:04:16,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:16,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:16,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:16,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:17,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 378 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:17,696 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:17,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 32 [2018-12-03 18:04:17,696 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:17,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-12-03 18:04:17,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-12-03 18:04:17,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=586, Unknown=0, NotChecked=0, Total=1056 [2018-12-03 18:04:17,697 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 33 states. [2018-12-03 18:04:18,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:18,412 INFO L93 Difference]: Finished difference Result 93 states and 94 transitions. [2018-12-03 18:04:18,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 18:04:18,412 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 84 [2018-12-03 18:04:18,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:18,413 INFO L225 Difference]: With dead ends: 93 [2018-12-03 18:04:18,413 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 18:04:18,414 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 138 SyntacticMatches, 54 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1595 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1367, Invalid=2293, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 18:04:18,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 18:04:18,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2018-12-03 18:04:18,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-12-03 18:04:18,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-12-03 18:04:18,432 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 84 [2018-12-03 18:04:18,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:18,432 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-12-03 18:04:18,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-12-03 18:04:18,432 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-12-03 18:04:18,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-12-03 18:04:18,432 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:18,432 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 27, 1, 1, 1, 1] [2018-12-03 18:04:18,433 INFO L423 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:18,433 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:18,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1432137950, now seen corresponding path program 53 times [2018-12-03 18:04:18,433 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:18,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:18,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:18,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:18,434 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:18,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:19,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:19,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:19,487 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:19,487 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:19,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:19,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:19,487 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 18:04:19,497 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:19,497 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:19,592 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-12-03 18:04:19,592 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:19,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:20,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:20,854 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:21,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 756 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:21,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:21,778 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 85 [2018-12-03 18:04:21,778 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:21,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 18:04:21,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 18:04:21,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:04:21,779 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 86 states. [2018-12-03 18:04:23,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:23,723 INFO L93 Difference]: Finished difference Result 147 states and 149 transitions. [2018-12-03 18:04:23,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 18:04:23,723 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 86 [2018-12-03 18:04:23,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:23,724 INFO L225 Difference]: With dead ends: 147 [2018-12-03 18:04:23,724 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 18:04:23,726 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 88 SyntacticMatches, 55 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4482 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2983, Invalid=9899, Unknown=0, NotChecked=0, Total=12882 [2018-12-03 18:04:23,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 18:04:23,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-12-03 18:04:23,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-03 18:04:23,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2018-12-03 18:04:23,746 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 86 [2018-12-03 18:04:23,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:23,746 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2018-12-03 18:04:23,746 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 18:04:23,746 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2018-12-03 18:04:23,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-12-03 18:04:23,747 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:23,747 INFO L402 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1] [2018-12-03 18:04:23,747 INFO L423 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:23,747 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:23,748 INFO L82 PathProgramCache]: Analyzing trace with hash -2048907495, now seen corresponding path program 54 times [2018-12-03 18:04:23,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:23,748 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:23,749 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:23,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:23,749 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:23,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:24,226 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:24,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:24,227 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:24,227 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:24,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:24,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:24,227 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 18:04:24,237 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:04:24,237 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:04:24,302 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:04:24,302 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:24,306 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:24,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:24,342 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:24,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 406 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:24,981 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:24,982 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 33 [2018-12-03 18:04:24,982 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:24,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 18:04:24,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 18:04:24,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=621, Unknown=0, NotChecked=0, Total=1122 [2018-12-03 18:04:24,983 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand 34 states. [2018-12-03 18:04:25,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:25,568 INFO L93 Difference]: Finished difference Result 96 states and 97 transitions. [2018-12-03 18:04:25,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 18:04:25,568 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 87 [2018-12-03 18:04:25,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:25,569 INFO L225 Difference]: With dead ends: 96 [2018-12-03 18:04:25,569 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 18:04:25,570 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 143 SyntacticMatches, 56 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1710 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1459, Invalid=2447, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 18:04:25,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 18:04:25,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2018-12-03 18:04:25,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-03 18:04:25,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 91 transitions. [2018-12-03 18:04:25,599 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 91 transitions. Word has length 87 [2018-12-03 18:04:25,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:25,599 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 91 transitions. [2018-12-03 18:04:25,599 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 18:04:25,600 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 91 transitions. [2018-12-03 18:04:25,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-12-03 18:04:25,600 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:25,600 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1] [2018-12-03 18:04:25,601 INFO L423 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:25,601 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:25,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1905147915, now seen corresponding path program 55 times [2018-12-03 18:04:25,601 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:25,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:25,602 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:25,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:25,602 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:25,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:27,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:27,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:27,142 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:27,142 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:27,143 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:27,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:27,143 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 18:04:27,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:27,155 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:04:27,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:27,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:28,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:28,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:29,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 812 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:29,653 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:29,654 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 88 [2018-12-03 18:04:29,654 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:29,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2018-12-03 18:04:29,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2018-12-03 18:04:29,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:04:29,655 INFO L87 Difference]: Start difference. First operand 90 states and 91 transitions. Second operand 89 states. [2018-12-03 18:04:31,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:31,619 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2018-12-03 18:04:31,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 18:04:31,619 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 89 [2018-12-03 18:04:31,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:31,620 INFO L225 Difference]: With dead ends: 152 [2018-12-03 18:04:31,620 INFO L226 Difference]: Without dead ends: 91 [2018-12-03 18:04:31,622 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 91 SyntacticMatches, 57 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4816 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3191, Invalid=10615, Unknown=0, NotChecked=0, Total=13806 [2018-12-03 18:04:31,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-12-03 18:04:31,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2018-12-03 18:04:31,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-12-03 18:04:31,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-12-03 18:04:31,641 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 89 [2018-12-03 18:04:31,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:31,641 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-12-03 18:04:31,641 INFO L481 AbstractCegarLoop]: Interpolant automaton has 89 states. [2018-12-03 18:04:31,641 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-12-03 18:04:31,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-12-03 18:04:31,642 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:31,642 INFO L402 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1] [2018-12-03 18:04:31,642 INFO L423 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:31,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:31,642 INFO L82 PathProgramCache]: Analyzing trace with hash 2078396574, now seen corresponding path program 56 times [2018-12-03 18:04:31,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:31,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:31,643 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:31,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:31,644 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:31,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:32,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:32,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:32,142 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:32,142 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:32,142 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:32,142 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:32,142 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 18:04:32,151 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:32,152 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:32,255 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2018-12-03 18:04:32,255 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:32,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:32,320 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:32,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:33,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:33,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:33,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 34 [2018-12-03 18:04:33,101 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:33,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-12-03 18:04:33,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-12-03 18:04:33,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=533, Invalid=657, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:04:33,102 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 35 states. [2018-12-03 18:04:33,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:33,769 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-12-03 18:04:33,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 18:04:33,770 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 90 [2018-12-03 18:04:33,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:33,770 INFO L225 Difference]: With dead ends: 99 [2018-12-03 18:04:33,770 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 18:04:33,771 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 148 SyntacticMatches, 58 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1829 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1554, Invalid=2606, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:04:33,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 18:04:33,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2018-12-03 18:04:33,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2018-12-03 18:04:33,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 94 transitions. [2018-12-03 18:04:33,803 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 94 transitions. Word has length 90 [2018-12-03 18:04:33,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:33,803 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 94 transitions. [2018-12-03 18:04:33,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-12-03 18:04:33,804 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 94 transitions. [2018-12-03 18:04:33,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-12-03 18:04:33,804 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:33,804 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 29, 1, 1, 1, 1] [2018-12-03 18:04:33,804 INFO L423 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:33,805 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:33,805 INFO L82 PathProgramCache]: Analyzing trace with hash 179248186, now seen corresponding path program 57 times [2018-12-03 18:04:33,805 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:33,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:33,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:33,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:33,806 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:33,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:35,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:35,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:35,352 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:35,352 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:35,352 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:35,352 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:35,352 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 18:04:35,362 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:04:35,362 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:04:35,438 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:04:35,438 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:35,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:36,888 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:36,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:37,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 870 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:37,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:37,994 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 91 [2018-12-03 18:04:37,995 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:37,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 18:04:37,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 18:04:37,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:04:37,996 INFO L87 Difference]: Start difference. First operand 93 states and 94 transitions. Second operand 92 states. [2018-12-03 18:04:40,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:40,102 INFO L93 Difference]: Finished difference Result 157 states and 159 transitions. [2018-12-03 18:04:40,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 18:04:40,102 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 92 [2018-12-03 18:04:40,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:40,103 INFO L225 Difference]: With dead ends: 157 [2018-12-03 18:04:40,103 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 18:04:40,105 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 94 SyntacticMatches, 59 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5162 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=3406, Invalid=11356, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:04:40,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 18:04:40,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-12-03 18:04:40,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 18:04:40,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-12-03 18:04:40,127 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 92 [2018-12-03 18:04:40,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:40,127 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-12-03 18:04:40,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 18:04:40,127 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-12-03 18:04:40,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 18:04:40,127 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:40,127 INFO L402 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1] [2018-12-03 18:04:40,128 INFO L423 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:40,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:40,128 INFO L82 PathProgramCache]: Analyzing trace with hash -288235791, now seen corresponding path program 58 times [2018-12-03 18:04:40,128 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:40,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:40,129 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:40,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:40,129 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:40,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:40,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:40,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:40,629 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:40,629 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:40,629 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:40,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:40,629 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 18:04:40,641 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:40,641 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:04:40,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:40,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:40,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:40,752 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:41,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 465 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:41,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:41,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 35 [2018-12-03 18:04:41,494 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:41,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 18:04:41,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 18:04:41,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=566, Invalid=694, Unknown=0, NotChecked=0, Total=1260 [2018-12-03 18:04:41,495 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 36 states. [2018-12-03 18:04:42,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:42,170 INFO L93 Difference]: Finished difference Result 102 states and 103 transitions. [2018-12-03 18:04:42,170 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 18:04:42,170 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 93 [2018-12-03 18:04:42,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:42,171 INFO L225 Difference]: With dead ends: 102 [2018-12-03 18:04:42,171 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 18:04:42,172 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 153 SyntacticMatches, 60 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1952 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1652, Invalid=2770, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 18:04:42,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 18:04:42,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96. [2018-12-03 18:04:42,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-12-03 18:04:42,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2018-12-03 18:04:42,195 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 93 [2018-12-03 18:04:42,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:42,196 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2018-12-03 18:04:42,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 18:04:42,196 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2018-12-03 18:04:42,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-12-03 18:04:42,196 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:42,196 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 30, 1, 1, 1, 1] [2018-12-03 18:04:42,196 INFO L423 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:42,197 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:42,197 INFO L82 PathProgramCache]: Analyzing trace with hash -2116754995, now seen corresponding path program 59 times [2018-12-03 18:04:42,197 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:42,197 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:42,198 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:42,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:42,198 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:42,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:43,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:43,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:43,461 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:43,461 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:43,461 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:43,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:43,461 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 18:04:43,471 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:43,471 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:43,580 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-12-03 18:04:43,581 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:43,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:46,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:46,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 930 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:47,196 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:47,196 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 94 [2018-12-03 18:04:47,196 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:47,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2018-12-03 18:04:47,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2018-12-03 18:04:47,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:04:47,198 INFO L87 Difference]: Start difference. First operand 96 states and 97 transitions. Second operand 95 states. [2018-12-03 18:04:48,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:48,461 INFO L93 Difference]: Finished difference Result 162 states and 164 transitions. [2018-12-03 18:04:48,461 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 18:04:48,462 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 95 [2018-12-03 18:04:48,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:48,462 INFO L225 Difference]: With dead ends: 162 [2018-12-03 18:04:48,462 INFO L226 Difference]: Without dead ends: 97 [2018-12-03 18:04:48,463 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 97 SyntacticMatches, 61 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3628, Invalid=12122, Unknown=0, NotChecked=0, Total=15750 [2018-12-03 18:04:48,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-12-03 18:04:48,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-12-03 18:04:48,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-12-03 18:04:48,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-12-03 18:04:48,486 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 95 [2018-12-03 18:04:48,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:48,486 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-12-03 18:04:48,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has 95 states. [2018-12-03 18:04:48,486 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-12-03 18:04:48,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-12-03 18:04:48,486 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:48,486 INFO L402 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1] [2018-12-03 18:04:48,487 INFO L423 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:48,487 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:48,487 INFO L82 PathProgramCache]: Analyzing trace with hash -352972874, now seen corresponding path program 60 times [2018-12-03 18:04:48,487 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:48,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:48,488 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:48,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:48,488 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:48,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:49,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:49,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:49,335 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:49,335 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:49,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:49,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:49,335 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 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 18:04:49,344 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:04:49,344 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:04:49,415 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:04:49,415 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:49,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:49,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:49,461 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:50,182 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 496 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:50,201 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:50,202 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 36 [2018-12-03 18:04:50,202 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:50,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-12-03 18:04:50,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-12-03 18:04:50,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=732, Unknown=0, NotChecked=0, Total=1332 [2018-12-03 18:04:50,203 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 37 states. [2018-12-03 18:04:50,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:50,869 INFO L93 Difference]: Finished difference Result 105 states and 106 transitions. [2018-12-03 18:04:50,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 18:04:50,869 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 96 [2018-12-03 18:04:50,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:50,870 INFO L225 Difference]: With dead ends: 105 [2018-12-03 18:04:50,870 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 18:04:50,870 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 158 SyntacticMatches, 62 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2079 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1753, Invalid=2939, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 18:04:50,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 18:04:50,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 99. [2018-12-03 18:04:50,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-12-03 18:04:50,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-12-03 18:04:50,895 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 96 [2018-12-03 18:04:50,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:50,895 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-12-03 18:04:50,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-12-03 18:04:50,896 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-12-03 18:04:50,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-12-03 18:04:50,896 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:50,896 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 31, 1, 1, 1, 1] [2018-12-03 18:04:50,896 INFO L423 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:50,896 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:50,897 INFO L82 PathProgramCache]: Analyzing trace with hash 95417682, now seen corresponding path program 61 times [2018-12-03 18:04:50,897 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:50,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:50,898 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:50,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:50,898 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:50,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:52,181 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:52,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:52,182 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:52,182 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:52,182 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:52,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:52,182 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 18:04:52,191 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:52,191 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:04:52,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:52,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:54,097 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:54,097 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:55,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 992 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:55,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:55,494 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 97 [2018-12-03 18:04:55,495 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:55,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 18:04:55,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 18:04:55,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:04:55,496 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 98 states. [2018-12-03 18:04:56,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:56,945 INFO L93 Difference]: Finished difference Result 167 states and 169 transitions. [2018-12-03 18:04:56,945 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 18:04:56,945 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 98 [2018-12-03 18:04:56,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:56,946 INFO L225 Difference]: With dead ends: 167 [2018-12-03 18:04:56,946 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 18:04:56,948 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 100 SyntacticMatches, 63 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5890 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3857, Invalid=12913, Unknown=0, NotChecked=0, Total=16770 [2018-12-03 18:04:56,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 18:04:56,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-12-03 18:04:56,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-12-03 18:04:56,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2018-12-03 18:04:56,978 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 98 [2018-12-03 18:04:56,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:56,978 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2018-12-03 18:04:56,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 18:04:56,978 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2018-12-03 18:04:56,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-12-03 18:04:56,978 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:56,979 INFO L402 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1] [2018-12-03 18:04:56,979 INFO L423 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:56,979 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:56,979 INFO L82 PathProgramCache]: Analyzing trace with hash 298685129, now seen corresponding path program 62 times [2018-12-03 18:04:56,979 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:56,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:56,980 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:04:56,980 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:56,980 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:57,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:04:57,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:57,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:57,535 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:04:57,536 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:04:57,536 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:04:57,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:04:57,536 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 18:04:57,545 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:04:57,545 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:04:57,890 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2018-12-03 18:04:57,890 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:04:57,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:04:57,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:57,951 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:04:58,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 528 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:04:58,753 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:04:58,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 37 [2018-12-03 18:04:58,753 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:04:58,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:04:58,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:04:58,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=635, Invalid=771, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:04:58,755 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand 38 states. [2018-12-03 18:04:59,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:04:59,599 INFO L93 Difference]: Finished difference Result 108 states and 109 transitions. [2018-12-03 18:04:59,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 18:04:59,599 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 99 [2018-12-03 18:04:59,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:04:59,601 INFO L225 Difference]: With dead ends: 108 [2018-12-03 18:04:59,601 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 18:04:59,602 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 163 SyntacticMatches, 64 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2210 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1857, Invalid=3113, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:04:59,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 18:04:59,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 102. [2018-12-03 18:04:59,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-12-03 18:04:59,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 103 transitions. [2018-12-03 18:04:59,628 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 103 transitions. Word has length 99 [2018-12-03 18:04:59,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:04:59,629 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 103 transitions. [2018-12-03 18:04:59,629 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:04:59,629 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 103 transitions. [2018-12-03 18:04:59,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-12-03 18:04:59,629 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:04:59,630 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 32, 1, 1, 1, 1] [2018-12-03 18:04:59,630 INFO L423 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:04:59,630 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:04:59,630 INFO L82 PathProgramCache]: Analyzing trace with hash -726466651, now seen corresponding path program 63 times [2018-12-03 18:04:59,630 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:04:59,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:59,631 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:04:59,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:04:59,632 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:04:59,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:01,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:01,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:01,075 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:01,075 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:01,075 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:01,075 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:01,076 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 18:05:01,090 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:05:01,091 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:05:01,169 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:05:01,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:01,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:02,841 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:02,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:04,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 1056 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:04,197 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:04,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 100 [2018-12-03 18:05:04,198 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:04,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2018-12-03 18:05:04,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2018-12-03 18:05:04,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:05:04,199 INFO L87 Difference]: Start difference. First operand 102 states and 103 transitions. Second operand 101 states. [2018-12-03 18:05:06,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:06,685 INFO L93 Difference]: Finished difference Result 172 states and 174 transitions. [2018-12-03 18:05:06,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 18:05:06,685 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 101 [2018-12-03 18:05:06,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:06,686 INFO L225 Difference]: With dead ends: 172 [2018-12-03 18:05:06,686 INFO L226 Difference]: Without dead ends: 103 [2018-12-03 18:05:06,688 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 103 SyntacticMatches, 65 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6272 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:05:06,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-12-03 18:05:06,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2018-12-03 18:05:06,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2018-12-03 18:05:06,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2018-12-03 18:05:06,716 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 101 [2018-12-03 18:05:06,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:06,716 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2018-12-03 18:05:06,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has 101 states. [2018-12-03 18:05:06,716 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2018-12-03 18:05:06,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-12-03 18:05:06,717 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:06,717 INFO L402 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1] [2018-12-03 18:05:06,717 INFO L423 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:06,717 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:06,717 INFO L82 PathProgramCache]: Analyzing trace with hash -1089840434, now seen corresponding path program 64 times [2018-12-03 18:05:06,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:06,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:06,718 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:06,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:06,718 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:06,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:07,294 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:07,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:07,294 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:07,294 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:07,294 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:07,294 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:07,295 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 18:05:07,304 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:07,304 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:05:07,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:07,382 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:07,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:07,435 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:08,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1617 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:08,271 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:08,271 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 38 [2018-12-03 18:05:08,272 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:08,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-12-03 18:05:08,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-12-03 18:05:08,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=671, Invalid=811, Unknown=0, NotChecked=0, Total=1482 [2018-12-03 18:05:08,273 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand 39 states. [2018-12-03 18:05:09,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:09,005 INFO L93 Difference]: Finished difference Result 111 states and 112 transitions. [2018-12-03 18:05:09,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 18:05:09,005 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 102 [2018-12-03 18:05:09,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:09,006 INFO L225 Difference]: With dead ends: 111 [2018-12-03 18:05:09,006 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 18:05:09,007 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 168 SyntacticMatches, 66 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2345 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1964, Invalid=3292, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 18:05:09,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 18:05:09,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 105. [2018-12-03 18:05:09,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-12-03 18:05:09,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2018-12-03 18:05:09,037 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 102 [2018-12-03 18:05:09,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:09,037 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2018-12-03 18:05:09,037 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-12-03 18:05:09,037 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2018-12-03 18:05:09,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-12-03 18:05:09,037 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:09,038 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 33, 1, 1, 1, 1] [2018-12-03 18:05:09,038 INFO L423 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:09,038 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:09,038 INFO L82 PathProgramCache]: Analyzing trace with hash 635296362, now seen corresponding path program 65 times [2018-12-03 18:05:09,038 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:09,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:09,039 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:09,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:09,039 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:09,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:10,762 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:10,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:10,763 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:10,763 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:10,763 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:10,763 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:10,763 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 18:05:10,772 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:05:10,772 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:05:10,895 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-12-03 18:05:10,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:10,899 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:12,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:12,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:14,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 1122 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:14,058 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:14,058 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 103 [2018-12-03 18:05:14,058 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:14,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2018-12-03 18:05:14,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2018-12-03 18:05:14,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:05:14,060 INFO L87 Difference]: Start difference. First operand 105 states and 106 transitions. Second operand 104 states. [2018-12-03 18:05:16,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:16,716 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2018-12-03 18:05:16,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-12-03 18:05:16,716 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 104 [2018-12-03 18:05:16,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:16,716 INFO L225 Difference]: With dead ends: 177 [2018-12-03 18:05:16,716 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 18:05:16,718 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 106 SyntacticMatches, 67 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6666 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=4336, Invalid=14570, Unknown=0, NotChecked=0, Total=18906 [2018-12-03 18:05:16,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 18:05:16,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-12-03 18:05:16,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-12-03 18:05:16,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2018-12-03 18:05:16,754 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 104 [2018-12-03 18:05:16,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:16,754 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2018-12-03 18:05:16,754 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2018-12-03 18:05:16,754 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2018-12-03 18:05:16,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-12-03 18:05:16,755 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:16,755 INFO L402 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1] [2018-12-03 18:05:16,755 INFO L423 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:16,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:16,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1315487071, now seen corresponding path program 66 times [2018-12-03 18:05:16,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:16,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:16,756 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:16,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:16,756 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:16,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:17,341 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:17,341 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:17,341 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:17,342 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:17,342 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:17,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:17,342 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 18:05:17,351 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:05:17,351 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:05:17,434 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:05:17,434 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:17,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:17,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:17,496 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:18,367 INFO L134 CoverageAnalysis]: Checked inductivity of 1717 backedges. 595 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:18,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:18,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 39 [2018-12-03 18:05:18,388 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:18,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 18:05:18,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 18:05:18,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=708, Invalid=852, Unknown=0, NotChecked=0, Total=1560 [2018-12-03 18:05:18,389 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand 40 states. [2018-12-03 18:05:19,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:19,146 INFO L93 Difference]: Finished difference Result 114 states and 115 transitions. [2018-12-03 18:05:19,147 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 18:05:19,147 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 105 [2018-12-03 18:05:19,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:19,148 INFO L225 Difference]: With dead ends: 114 [2018-12-03 18:05:19,148 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 18:05:19,149 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 173 SyntacticMatches, 68 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2484 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2074, Invalid=3476, Unknown=0, NotChecked=0, Total=5550 [2018-12-03 18:05:19,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 18:05:19,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 108. [2018-12-03 18:05:19,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 18:05:19,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2018-12-03 18:05:19,177 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 105 [2018-12-03 18:05:19,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:19,177 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2018-12-03 18:05:19,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 18:05:19,177 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2018-12-03 18:05:19,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 18:05:19,178 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:19,178 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 34, 1, 1, 1, 1] [2018-12-03 18:05:19,178 INFO L423 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:19,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:19,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1462756995, now seen corresponding path program 67 times [2018-12-03 18:05:19,178 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:19,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:19,179 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:19,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:19,179 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:19,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:20,828 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:20,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:20,829 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:20,829 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:20,829 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:20,829 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:20,829 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:20,837 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:20,837 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:05:20,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:20,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:22,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:22,767 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:24,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 1190 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:24,194 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:24,195 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 106 [2018-12-03 18:05:24,195 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:24,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2018-12-03 18:05:24,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2018-12-03 18:05:24,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:05:24,196 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 107 states. [2018-12-03 18:05:26,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:26,919 INFO L93 Difference]: Finished difference Result 182 states and 184 transitions. [2018-12-03 18:05:26,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 18:05:26,919 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 107 [2018-12-03 18:05:26,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:26,920 INFO L225 Difference]: With dead ends: 182 [2018-12-03 18:05:26,920 INFO L226 Difference]: Without dead ends: 109 [2018-12-03 18:05:26,921 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 109 SyntacticMatches, 69 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7072 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=4586, Invalid=15436, Unknown=0, NotChecked=0, Total=20022 [2018-12-03 18:05:26,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-12-03 18:05:26,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-12-03 18:05:26,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-12-03 18:05:26,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-12-03 18:05:26,948 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 107 [2018-12-03 18:05:26,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:26,949 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-12-03 18:05:26,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has 107 states. [2018-12-03 18:05:26,949 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-12-03 18:05:26,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-12-03 18:05:26,949 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:26,949 INFO L402 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1] [2018-12-03 18:05:26,950 INFO L423 AbstractCegarLoop]: === Iteration 70 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:26,950 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:26,950 INFO L82 PathProgramCache]: Analyzing trace with hash -2049527322, now seen corresponding path program 68 times [2018-12-03 18:05:26,950 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:26,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:26,951 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:26,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:26,951 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:26,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:27,571 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:27,571 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:27,571 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:27,571 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:27,571 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:27,572 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:27,572 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:27,579 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:05:27,580 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:05:27,711 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2018-12-03 18:05:27,712 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:27,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:27,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:27,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:28,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 630 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:28,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:28,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 40 [2018-12-03 18:05:28,731 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:28,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-12-03 18:05:28,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-12-03 18:05:28,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=746, Invalid=894, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:05:28,732 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 41 states. [2018-12-03 18:05:29,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:29,528 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2018-12-03 18:05:29,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 18:05:29,528 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 108 [2018-12-03 18:05:29,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:29,529 INFO L225 Difference]: With dead ends: 117 [2018-12-03 18:05:29,529 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 18:05:29,530 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 178 SyntacticMatches, 70 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2627 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2187, Invalid=3665, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:05:29,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 18:05:29,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 111. [2018-12-03 18:05:29,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-12-03 18:05:29,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 112 transitions. [2018-12-03 18:05:29,559 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 112 transitions. Word has length 108 [2018-12-03 18:05:29,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:29,560 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 112 transitions. [2018-12-03 18:05:29,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-12-03 18:05:29,560 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 112 transitions. [2018-12-03 18:05:29,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-12-03 18:05:29,560 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:29,560 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 35, 1, 1, 1, 1] [2018-12-03 18:05:29,561 INFO L423 AbstractCegarLoop]: === Iteration 71 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:29,561 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:29,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1794165634, now seen corresponding path program 69 times [2018-12-03 18:05:29,561 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:29,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:29,562 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:29,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:29,562 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:29,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:31,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:31,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:31,297 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:31,297 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:31,297 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:31,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:31,297 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:31,306 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:05:31,306 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:05:31,391 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:05:31,391 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:31,396 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:33,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:33,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:34,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 1260 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:34,922 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:34,922 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 109 [2018-12-03 18:05:34,922 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:34,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 18:05:34,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 18:05:34,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:05:34,924 INFO L87 Difference]: Start difference. First operand 111 states and 112 transitions. Second operand 110 states. [2018-12-03 18:05:37,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:37,810 INFO L93 Difference]: Finished difference Result 187 states and 189 transitions. [2018-12-03 18:05:37,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 18:05:37,811 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 110 [2018-12-03 18:05:37,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:37,811 INFO L225 Difference]: With dead ends: 187 [2018-12-03 18:05:37,811 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 18:05:37,813 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 112 SyntacticMatches, 71 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7490 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=4843, Invalid=16327, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:05:37,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 18:05:37,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-12-03 18:05:37,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 18:05:37,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2018-12-03 18:05:37,841 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 110 [2018-12-03 18:05:37,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:37,842 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2018-12-03 18:05:37,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 18:05:37,842 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2018-12-03 18:05:37,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 18:05:37,842 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:37,842 INFO L402 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1] [2018-12-03 18:05:37,843 INFO L423 AbstractCegarLoop]: === Iteration 72 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:37,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:37,843 INFO L82 PathProgramCache]: Analyzing trace with hash 1836248697, now seen corresponding path program 70 times [2018-12-03 18:05:37,843 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:37,843 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:37,843 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:37,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:37,844 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:37,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:38,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:38,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:38,500 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:38,500 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:38,500 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:38,500 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:38,500 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:38,508 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:38,509 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:05:38,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:38,597 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:38,657 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:38,657 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:39,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 666 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:39,805 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:39,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 41 [2018-12-03 18:05:39,806 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:39,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 18:05:39,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 18:05:39,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=785, Invalid=937, Unknown=0, NotChecked=0, Total=1722 [2018-12-03 18:05:39,807 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand 42 states. [2018-12-03 18:05:40,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:40,827 INFO L93 Difference]: Finished difference Result 120 states and 121 transitions. [2018-12-03 18:05:40,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 18:05:40,828 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 111 [2018-12-03 18:05:40,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:40,829 INFO L225 Difference]: With dead ends: 120 [2018-12-03 18:05:40,829 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 18:05:40,830 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 183 SyntacticMatches, 72 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2774 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2303, Invalid=3859, Unknown=0, NotChecked=0, Total=6162 [2018-12-03 18:05:40,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 18:05:40,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 114. [2018-12-03 18:05:40,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 18:05:40,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 115 transitions. [2018-12-03 18:05:40,864 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 115 transitions. Word has length 111 [2018-12-03 18:05:40,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:40,864 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 115 transitions. [2018-12-03 18:05:40,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 18:05:40,864 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 115 transitions. [2018-12-03 18:05:40,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 18:05:40,865 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:40,865 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 36, 1, 1, 1, 1] [2018-12-03 18:05:40,865 INFO L423 AbstractCegarLoop]: === Iteration 73 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:40,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:40,865 INFO L82 PathProgramCache]: Analyzing trace with hash -596627627, now seen corresponding path program 71 times [2018-12-03 18:05:40,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:40,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:40,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:40,866 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:40,866 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:40,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:42,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:42,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:42,580 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:42,580 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:42,580 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:42,580 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:42,580 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:42,588 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:05:42,588 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:05:42,731 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-12-03 18:05:42,731 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:42,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:44,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:44,866 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:46,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 1332 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:46,583 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:46,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 112 [2018-12-03 18:05:46,583 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:46,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2018-12-03 18:05:46,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2018-12-03 18:05:46,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:05:46,584 INFO L87 Difference]: Start difference. First operand 114 states and 115 transitions. Second operand 113 states. [2018-12-03 18:05:49,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:49,596 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2018-12-03 18:05:49,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 18:05:49,597 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 113 [2018-12-03 18:05:49,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:49,597 INFO L225 Difference]: With dead ends: 192 [2018-12-03 18:05:49,597 INFO L226 Difference]: Without dead ends: 115 [2018-12-03 18:05:49,599 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 115 SyntacticMatches, 73 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7920 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=5107, Invalid=17243, Unknown=0, NotChecked=0, Total=22350 [2018-12-03 18:05:49,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-12-03 18:05:49,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2018-12-03 18:05:49,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-12-03 18:05:49,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2018-12-03 18:05:49,630 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 113 [2018-12-03 18:05:49,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:49,630 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2018-12-03 18:05:49,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has 113 states. [2018-12-03 18:05:49,630 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2018-12-03 18:05:49,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-12-03 18:05:49,630 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:49,631 INFO L402 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1] [2018-12-03 18:05:49,631 INFO L423 AbstractCegarLoop]: === Iteration 74 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:49,631 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:49,631 INFO L82 PathProgramCache]: Analyzing trace with hash -1030548226, now seen corresponding path program 72 times [2018-12-03 18:05:49,631 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:49,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:49,632 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:49,632 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:49,632 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:49,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:50,855 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:50,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:50,855 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:50,855 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:50,856 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:50,856 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:50,856 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:50,865 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:05:50,865 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:05:50,953 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:05:50,953 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:05:50,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:51,036 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:51,036 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:52,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 703 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:52,127 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:52,127 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 42 [2018-12-03 18:05:52,127 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:52,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-12-03 18:05:52,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-12-03 18:05:52,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=825, Invalid=981, Unknown=0, NotChecked=0, Total=1806 [2018-12-03 18:05:52,128 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand 43 states. [2018-12-03 18:05:53,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:05:53,006 INFO L93 Difference]: Finished difference Result 123 states and 124 transitions. [2018-12-03 18:05:53,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 18:05:53,006 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 114 [2018-12-03 18:05:53,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:05:53,007 INFO L225 Difference]: With dead ends: 123 [2018-12-03 18:05:53,007 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 18:05:53,008 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 188 SyntacticMatches, 74 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2925 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2422, Invalid=4058, Unknown=0, NotChecked=0, Total=6480 [2018-12-03 18:05:53,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 18:05:53,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 117. [2018-12-03 18:05:53,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-12-03 18:05:53,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-12-03 18:05:53,040 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 114 [2018-12-03 18:05:53,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:05:53,041 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-12-03 18:05:53,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-12-03 18:05:53,041 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-12-03 18:05:53,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-12-03 18:05:53,041 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:05:53,041 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 37, 1, 1, 1, 1] [2018-12-03 18:05:53,041 INFO L423 AbstractCegarLoop]: === Iteration 75 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:05:53,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:05:53,042 INFO L82 PathProgramCache]: Analyzing trace with hash 1780533402, now seen corresponding path program 73 times [2018-12-03 18:05:53,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:05:53,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:53,042 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:05:53,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:05:53,043 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:05:53,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:54,974 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:54,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:54,975 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:05:54,975 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:05:54,975 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:05:54,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:05:54,975 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:05:54,984 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:05:54,984 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:05:55,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:05:55,073 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:05:57,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:57,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:05:59,022 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 1406 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:05:59,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:05:59,054 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 115 [2018-12-03 18:05:59,054 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:05:59,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-12-03 18:05:59,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-12-03 18:05:59,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 18:05:59,056 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 116 states. [2018-12-03 18:06:02,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:02,385 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2018-12-03 18:06:02,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 18:06:02,385 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 116 [2018-12-03 18:06:02,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:02,386 INFO L225 Difference]: With dead ends: 197 [2018-12-03 18:06:02,386 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 18:06:02,388 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 118 SyntacticMatches, 75 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8362 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=5378, Invalid=18184, Unknown=0, NotChecked=0, Total=23562 [2018-12-03 18:06:02,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 18:06:02,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2018-12-03 18:06:02,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-12-03 18:06:02,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-12-03 18:06:02,419 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 116 [2018-12-03 18:06:02,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:02,420 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-12-03 18:06:02,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-12-03 18:06:02,420 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-12-03 18:06:02,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-12-03 18:06:02,420 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:02,420 INFO L402 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1] [2018-12-03 18:06:02,421 INFO L423 AbstractCegarLoop]: === Iteration 76 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:02,421 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:02,421 INFO L82 PathProgramCache]: Analyzing trace with hash -1591437743, now seen corresponding path program 74 times [2018-12-03 18:06:02,421 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:02,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:02,421 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:02,422 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:02,422 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:02,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:03,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:03,371 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:03,372 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:03,372 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:03,372 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:03,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:03,372 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:03,380 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:06:03,381 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:06:03,523 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2018-12-03 18:06:03,524 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:03,528 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:03,585 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:03,585 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:04,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 741 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:04,695 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:04,696 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 43 [2018-12-03 18:06:04,696 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:04,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:06:04,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:06:04,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=866, Invalid=1026, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:06:04,697 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 44 states. [2018-12-03 18:06:05,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:05,762 INFO L93 Difference]: Finished difference Result 126 states and 127 transitions. [2018-12-03 18:06:05,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 18:06:05,762 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 117 [2018-12-03 18:06:05,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:05,763 INFO L225 Difference]: With dead ends: 126 [2018-12-03 18:06:05,763 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 18:06:05,764 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 193 SyntacticMatches, 76 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2544, Invalid=4262, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 18:06:05,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 18:06:05,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 120. [2018-12-03 18:06:05,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-12-03 18:06:05,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 121 transitions. [2018-12-03 18:06:05,798 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 121 transitions. Word has length 117 [2018-12-03 18:06:05,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:05,798 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 121 transitions. [2018-12-03 18:06:05,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:06:05,798 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 121 transitions. [2018-12-03 18:06:05,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-12-03 18:06:05,799 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:05,799 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 38, 1, 1, 1, 1] [2018-12-03 18:06:05,799 INFO L423 AbstractCegarLoop]: === Iteration 77 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:05,799 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:05,799 INFO L82 PathProgramCache]: Analyzing trace with hash -363380435, now seen corresponding path program 75 times [2018-12-03 18:06:05,799 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:05,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:05,800 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:05,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:05,800 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:05,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:07,722 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:07,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:07,722 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:07,722 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:07,723 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:07,723 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:07,723 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:07,732 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:06:07,732 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:06:07,826 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:06:07,826 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:07,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:10,079 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:10,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:11,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 1482 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:11,960 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:11,960 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 118 [2018-12-03 18:06:11,960 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:11,960 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2018-12-03 18:06:11,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2018-12-03 18:06:11,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:06:11,961 INFO L87 Difference]: Start difference. First operand 120 states and 121 transitions. Second operand 119 states. [2018-12-03 18:06:15,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:15,293 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2018-12-03 18:06:15,293 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 18:06:15,293 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 119 [2018-12-03 18:06:15,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:15,293 INFO L225 Difference]: With dead ends: 202 [2018-12-03 18:06:15,294 INFO L226 Difference]: Without dead ends: 121 [2018-12-03 18:06:15,295 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 121 SyntacticMatches, 77 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8816 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=5656, Invalid=19150, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:06:15,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-12-03 18:06:15,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2018-12-03 18:06:15,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-12-03 18:06:15,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2018-12-03 18:06:15,329 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 119 [2018-12-03 18:06:15,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:15,329 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2018-12-03 18:06:15,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has 119 states. [2018-12-03 18:06:15,329 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2018-12-03 18:06:15,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-12-03 18:06:15,330 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:15,330 INFO L402 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1] [2018-12-03 18:06:15,330 INFO L423 AbstractCegarLoop]: === Iteration 78 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:15,330 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:15,330 INFO L82 PathProgramCache]: Analyzing trace with hash 234325014, now seen corresponding path program 76 times [2018-12-03 18:06:15,330 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:15,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:15,331 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:15,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:15,331 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:15,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:16,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:16,512 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:16,512 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:16,512 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:16,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:16,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:16,513 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:16,521 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:16,521 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:06:16,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:16,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:16,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:16,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:17,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 780 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:17,788 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:17,788 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 44 [2018-12-03 18:06:17,788 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:17,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-12-03 18:06:17,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-12-03 18:06:17,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=908, Invalid=1072, Unknown=0, NotChecked=0, Total=1980 [2018-12-03 18:06:17,789 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand 45 states. [2018-12-03 18:06:18,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:18,737 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-12-03 18:06:18,737 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 18:06:18,737 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 120 [2018-12-03 18:06:18,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:18,739 INFO L225 Difference]: With dead ends: 129 [2018-12-03 18:06:18,739 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 18:06:18,740 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 198 SyntacticMatches, 78 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3239 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2669, Invalid=4471, Unknown=0, NotChecked=0, Total=7140 [2018-12-03 18:06:18,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 18:06:18,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 123. [2018-12-03 18:06:18,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2018-12-03 18:06:18,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 124 transitions. [2018-12-03 18:06:18,775 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 124 transitions. Word has length 120 [2018-12-03 18:06:18,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:18,775 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 124 transitions. [2018-12-03 18:06:18,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-12-03 18:06:18,776 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 124 transitions. [2018-12-03 18:06:18,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2018-12-03 18:06:18,776 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:18,776 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 39, 1, 1, 1, 1] [2018-12-03 18:06:18,776 INFO L423 AbstractCegarLoop]: === Iteration 79 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:18,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:18,776 INFO L82 PathProgramCache]: Analyzing trace with hash 1847972274, now seen corresponding path program 77 times [2018-12-03 18:06:18,777 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:18,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:18,777 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:18,777 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:18,777 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:18,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:20,757 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:20,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:20,758 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:20,758 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:20,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:20,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:20,758 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:20,767 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:06:20,767 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:06:20,928 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-12-03 18:06:20,928 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:20,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:23,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:23,451 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:25,268 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 1560 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:25,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:25,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 121 [2018-12-03 18:06:25,287 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:25,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2018-12-03 18:06:25,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2018-12-03 18:06:25,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:06:25,289 INFO L87 Difference]: Start difference. First operand 123 states and 124 transitions. Second operand 122 states. [2018-12-03 18:06:28,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:28,977 INFO L93 Difference]: Finished difference Result 207 states and 209 transitions. [2018-12-03 18:06:28,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2018-12-03 18:06:28,977 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 122 [2018-12-03 18:06:28,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:28,978 INFO L225 Difference]: With dead ends: 207 [2018-12-03 18:06:28,978 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 18:06:28,979 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 124 SyntacticMatches, 79 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9282 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=5941, Invalid=20141, Unknown=0, NotChecked=0, Total=26082 [2018-12-03 18:06:28,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 18:06:29,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-12-03 18:06:29,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-12-03 18:06:29,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2018-12-03 18:06:29,014 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 122 [2018-12-03 18:06:29,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:29,015 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2018-12-03 18:06:29,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2018-12-03 18:06:29,015 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2018-12-03 18:06:29,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-12-03 18:06:29,015 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:29,015 INFO L402 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1] [2018-12-03 18:06:29,015 INFO L423 AbstractCegarLoop]: === Iteration 80 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:29,016 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:29,016 INFO L82 PathProgramCache]: Analyzing trace with hash 1156594217, now seen corresponding path program 78 times [2018-12-03 18:06:29,016 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:29,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:29,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:29,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:29,017 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:29,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:29,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:29,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:29,830 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:29,830 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:29,830 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:29,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:29,831 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:29,838 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:06:29,839 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:06:29,936 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:06:29,936 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:29,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:30,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:30,002 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:31,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 820 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:31,336 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:31,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 45 [2018-12-03 18:06:31,336 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:31,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 18:06:31,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 18:06:31,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=951, Invalid=1119, Unknown=0, NotChecked=0, Total=2070 [2018-12-03 18:06:31,337 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand 46 states. [2018-12-03 18:06:32,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:32,306 INFO L93 Difference]: Finished difference Result 132 states and 133 transitions. [2018-12-03 18:06:32,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 18:06:32,307 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 123 [2018-12-03 18:06:32,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:32,308 INFO L225 Difference]: With dead ends: 132 [2018-12-03 18:06:32,308 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 18:06:32,309 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 203 SyntacticMatches, 80 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3402 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2797, Invalid=4685, Unknown=0, NotChecked=0, Total=7482 [2018-12-03 18:06:32,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 18:06:32,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 126. [2018-12-03 18:06:32,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 18:06:32,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 127 transitions. [2018-12-03 18:06:32,358 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 127 transitions. Word has length 123 [2018-12-03 18:06:32,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:32,359 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 127 transitions. [2018-12-03 18:06:32,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 18:06:32,359 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 127 transitions. [2018-12-03 18:06:32,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-12-03 18:06:32,360 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:32,360 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 40, 1, 1, 1, 1] [2018-12-03 18:06:32,360 INFO L423 AbstractCegarLoop]: === Iteration 81 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:32,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:32,360 INFO L82 PathProgramCache]: Analyzing trace with hash -909553915, now seen corresponding path program 79 times [2018-12-03 18:06:32,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:32,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:32,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:32,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:32,362 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:32,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:34,585 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:34,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:34,585 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:34,585 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:34,585 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:34,585 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:34,585 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:34,594 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:34,594 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:06:34,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:34,692 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:37,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:37,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:39,472 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 1640 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:39,491 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:39,491 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 124 [2018-12-03 18:06:39,491 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:39,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2018-12-03 18:06:39,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2018-12-03 18:06:39,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 18:06:39,493 INFO L87 Difference]: Start difference. First operand 126 states and 127 transitions. Second operand 125 states. [2018-12-03 18:06:43,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:43,305 INFO L93 Difference]: Finished difference Result 212 states and 214 transitions. [2018-12-03 18:06:43,305 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 18:06:43,305 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 125 [2018-12-03 18:06:43,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:43,306 INFO L225 Difference]: With dead ends: 212 [2018-12-03 18:06:43,306 INFO L226 Difference]: Without dead ends: 127 [2018-12-03 18:06:43,308 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 127 SyntacticMatches, 81 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9760 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2018-12-03 18:06:43,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-12-03 18:06:43,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-12-03 18:06:43,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-12-03 18:06:43,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-12-03 18:06:43,355 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 125 [2018-12-03 18:06:43,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:43,356 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-12-03 18:06:43,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has 125 states. [2018-12-03 18:06:43,356 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-12-03 18:06:43,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-12-03 18:06:43,357 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:43,357 INFO L402 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1] [2018-12-03 18:06:43,357 INFO L423 AbstractCegarLoop]: === Iteration 82 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:43,357 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:43,357 INFO L82 PathProgramCache]: Analyzing trace with hash 909901614, now seen corresponding path program 80 times [2018-12-03 18:06:43,358 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:43,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:43,358 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:43,358 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:43,358 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:43,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:44,202 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:44,202 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:44,202 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:44,202 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:44,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:44,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:44,203 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 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:44,215 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:06:44,215 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:06:44,385 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2018-12-03 18:06:44,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:44,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:44,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:44,450 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:45,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 861 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:45,695 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:45,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 46 [2018-12-03 18:06:45,695 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:45,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-12-03 18:06:45,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-12-03 18:06:45,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=995, Invalid=1167, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:06:45,696 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 47 states. [2018-12-03 18:06:46,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:46,937 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2018-12-03 18:06:46,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 18:06:46,937 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 126 [2018-12-03 18:06:46,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:46,938 INFO L225 Difference]: With dead ends: 135 [2018-12-03 18:06:46,939 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 18:06:46,940 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 377 GetRequests, 208 SyntacticMatches, 82 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3569 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2928, Invalid=4904, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:06:46,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 18:06:46,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 129. [2018-12-03 18:06:46,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-12-03 18:06:46,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-12-03 18:06:46,986 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 126 [2018-12-03 18:06:46,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:46,987 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-12-03 18:06:46,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-12-03 18:06:46,987 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-12-03 18:06:46,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2018-12-03 18:06:46,988 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:46,988 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 41, 1, 1, 1, 1] [2018-12-03 18:06:46,988 INFO L423 AbstractCegarLoop]: === Iteration 83 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:46,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:46,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1757944118, now seen corresponding path program 81 times [2018-12-03 18:06:46,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:46,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:46,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:46,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:46,989 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:47,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:49,219 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:49,219 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:49,219 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:49,219 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:49,220 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:49,220 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:49,220 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:49,228 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:06:49,229 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:06:49,329 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:06:49,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:06:49,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:52,357 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:52,358 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:06:54,375 INFO L134 CoverageAnalysis]: Checked inductivity of 2583 backedges. 1722 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:54,395 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:06:54,395 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 127 [2018-12-03 18:06:54,395 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:06:54,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2018-12-03 18:06:54,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2018-12-03 18:06:54,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:06:54,396 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 128 states. [2018-12-03 18:06:58,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:06:58,456 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2018-12-03 18:06:58,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 18:06:58,457 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 128 [2018-12-03 18:06:58,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:06:58,458 INFO L225 Difference]: With dead ends: 217 [2018-12-03 18:06:58,458 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 18:06:58,459 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 381 GetRequests, 130 SyntacticMatches, 83 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10250 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=6532, Invalid=22198, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:06:58,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 18:06:58,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2018-12-03 18:06:58,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-12-03 18:06:58,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-12-03 18:06:58,511 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 128 [2018-12-03 18:06:58,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:06:58,511 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-12-03 18:06:58,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2018-12-03 18:06:58,511 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-12-03 18:06:58,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-12-03 18:06:58,512 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:06:58,512 INFO L402 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1] [2018-12-03 18:06:58,512 INFO L423 AbstractCegarLoop]: === Iteration 84 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:06:58,512 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:06:58,512 INFO L82 PathProgramCache]: Analyzing trace with hash -845555199, now seen corresponding path program 82 times [2018-12-03 18:06:58,513 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:06:58,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:58,513 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:06:58,513 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:06:58,513 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:06:58,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:59,488 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:59,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:59,489 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:06:59,489 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:06:59,489 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:06:59,489 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:06:59,489 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 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:06:59,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:06:59,499 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:06:59,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:06:59,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:06:59,666 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:06:59,666 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:00,990 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 903 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:01,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:01,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 47 [2018-12-03 18:07:01,009 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:01,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 18:07:01,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 18:07:01,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1040, Invalid=1216, Unknown=0, NotChecked=0, Total=2256 [2018-12-03 18:07:01,010 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 48 states. [2018-12-03 18:07:02,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:02,311 INFO L93 Difference]: Finished difference Result 138 states and 139 transitions. [2018-12-03 18:07:02,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 18:07:02,311 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 129 [2018-12-03 18:07:02,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:02,312 INFO L225 Difference]: With dead ends: 138 [2018-12-03 18:07:02,312 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 18:07:02,313 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 213 SyntacticMatches, 84 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3740 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3062, Invalid=5128, Unknown=0, NotChecked=0, Total=8190 [2018-12-03 18:07:02,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 18:07:02,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 132. [2018-12-03 18:07:02,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-12-03 18:07:02,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 133 transitions. [2018-12-03 18:07:02,352 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 133 transitions. Word has length 129 [2018-12-03 18:07:02,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:02,352 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 133 transitions. [2018-12-03 18:07:02,352 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 18:07:02,353 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 133 transitions. [2018-12-03 18:07:02,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-12-03 18:07:02,353 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:02,353 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 42, 1, 1, 1, 1] [2018-12-03 18:07:02,354 INFO L423 AbstractCegarLoop]: === Iteration 85 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:02,354 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:02,354 INFO L82 PathProgramCache]: Analyzing trace with hash -829794083, now seen corresponding path program 83 times [2018-12-03 18:07:02,354 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:02,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:02,355 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:02,355 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:02,355 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:02,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:04,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:04,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:04,604 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:04,605 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:04,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:04,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:04,605 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:04,613 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:04,613 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:04,789 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2018-12-03 18:07:04,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:04,794 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:07,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:07,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:09,931 INFO L134 CoverageAnalysis]: Checked inductivity of 2709 backedges. 1806 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:09,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:09,950 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 130 [2018-12-03 18:07:09,951 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:09,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2018-12-03 18:07:09,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2018-12-03 18:07:09,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 18:07:09,952 INFO L87 Difference]: Start difference. First operand 132 states and 133 transitions. Second operand 131 states. [2018-12-03 18:07:13,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:13,093 INFO L93 Difference]: Finished difference Result 222 states and 224 transitions. [2018-12-03 18:07:13,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 18:07:13,093 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 131 [2018-12-03 18:07:13,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:13,094 INFO L225 Difference]: With dead ends: 222 [2018-12-03 18:07:13,094 INFO L226 Difference]: Without dead ends: 133 [2018-12-03 18:07:13,095 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 133 SyntacticMatches, 85 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10752 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=6838, Invalid=23264, Unknown=0, NotChecked=0, Total=30102 [2018-12-03 18:07:13,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2018-12-03 18:07:13,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2018-12-03 18:07:13,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-12-03 18:07:13,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-12-03 18:07:13,132 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 131 [2018-12-03 18:07:13,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:13,132 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-12-03 18:07:13,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 131 states. [2018-12-03 18:07:13,132 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-12-03 18:07:13,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-12-03 18:07:13,133 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:13,133 INFO L402 BasicCegarLoop]: trace histogram [43, 43, 42, 1, 1, 1, 1] [2018-12-03 18:07:13,133 INFO L423 AbstractCegarLoop]: === Iteration 86 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:13,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:13,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1595442758, now seen corresponding path program 84 times [2018-12-03 18:07:13,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:13,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:13,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:13,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:13,135 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:13,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:14,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:14,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:14,037 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:14,038 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:14,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:14,038 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:14,038 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 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:14,046 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:14,046 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:14,153 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:14,153 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:14,160 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:14,225 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:14,225 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:15,613 INFO L134 CoverageAnalysis]: Checked inductivity of 2752 backedges. 946 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:15,634 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:15,634 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 48 [2018-12-03 18:07:15,634 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:15,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-12-03 18:07:15,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-12-03 18:07:15,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1086, Invalid=1266, Unknown=0, NotChecked=0, Total=2352 [2018-12-03 18:07:15,636 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 49 states. [2018-12-03 18:07:16,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:16,676 INFO L93 Difference]: Finished difference Result 141 states and 142 transitions. [2018-12-03 18:07:16,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 18:07:16,676 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 132 [2018-12-03 18:07:16,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:16,678 INFO L225 Difference]: With dead ends: 141 [2018-12-03 18:07:16,678 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 18:07:16,679 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 218 SyntacticMatches, 86 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3915 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3199, Invalid=5357, Unknown=0, NotChecked=0, Total=8556 [2018-12-03 18:07:16,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 18:07:16,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 135. [2018-12-03 18:07:16,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2018-12-03 18:07:16,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 136 transitions. [2018-12-03 18:07:16,718 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 136 transitions. Word has length 132 [2018-12-03 18:07:16,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:16,718 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 136 transitions. [2018-12-03 18:07:16,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-12-03 18:07:16,719 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 136 transitions. [2018-12-03 18:07:16,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-12-03 18:07:16,719 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:16,719 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 43, 1, 1, 1, 1] [2018-12-03 18:07:16,720 INFO L423 AbstractCegarLoop]: === Iteration 87 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:16,720 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:16,720 INFO L82 PathProgramCache]: Analyzing trace with hash -82901022, now seen corresponding path program 85 times [2018-12-03 18:07:16,720 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:16,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:16,721 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:16,721 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:16,721 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:16,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:19,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:19,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:19,509 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:19,509 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:19,509 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:19,510 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:19,510 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:19,521 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:19,521 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:19,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:19,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:22,782 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:22,782 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:24,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 1892 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:24,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:24,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 133 [2018-12-03 18:07:24,995 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:24,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2018-12-03 18:07:24,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2018-12-03 18:07:24,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:07:24,997 INFO L87 Difference]: Start difference. First operand 135 states and 136 transitions. Second operand 134 states. [2018-12-03 18:07:28,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:28,322 INFO L93 Difference]: Finished difference Result 227 states and 229 transitions. [2018-12-03 18:07:28,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 18:07:28,322 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 134 [2018-12-03 18:07:28,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:28,323 INFO L225 Difference]: With dead ends: 227 [2018-12-03 18:07:28,323 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 18:07:28,324 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 136 SyntacticMatches, 87 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11266 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=7151, Invalid=24355, Unknown=0, NotChecked=0, Total=31506 [2018-12-03 18:07:28,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 18:07:28,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-12-03 18:07:28,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 18:07:28,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2018-12-03 18:07:28,364 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 134 [2018-12-03 18:07:28,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:28,364 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2018-12-03 18:07:28,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2018-12-03 18:07:28,364 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2018-12-03 18:07:28,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 18:07:28,365 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:28,365 INFO L402 BasicCegarLoop]: trace histogram [44, 44, 43, 1, 1, 1, 1] [2018-12-03 18:07:28,365 INFO L423 AbstractCegarLoop]: === Iteration 88 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:28,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:28,366 INFO L82 PathProgramCache]: Analyzing trace with hash 207975897, now seen corresponding path program 86 times [2018-12-03 18:07:28,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:28,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:28,366 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:28,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:28,367 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:28,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:29,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:29,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:29,293 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:29,293 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:29,293 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:29,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:29,293 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:29,302 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:29,302 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:29,489 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 44 check-sat command(s) [2018-12-03 18:07:29,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:29,494 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:29,555 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:29,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:30,999 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 990 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:31,018 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:31,019 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 49 [2018-12-03 18:07:31,019 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:31,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:07:31,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:07:31,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=1317, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:07:31,020 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand 50 states. [2018-12-03 18:07:32,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:32,103 INFO L93 Difference]: Finished difference Result 144 states and 145 transitions. [2018-12-03 18:07:32,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 18:07:32,104 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 135 [2018-12-03 18:07:32,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:32,105 INFO L225 Difference]: With dead ends: 144 [2018-12-03 18:07:32,105 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 18:07:32,106 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 404 GetRequests, 223 SyntacticMatches, 88 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4094 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=3339, Invalid=5591, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:07:32,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 18:07:32,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 138. [2018-12-03 18:07:32,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-12-03 18:07:32,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 139 transitions. [2018-12-03 18:07:32,153 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 139 transitions. Word has length 135 [2018-12-03 18:07:32,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:32,154 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 139 transitions. [2018-12-03 18:07:32,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:07:32,154 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 139 transitions. [2018-12-03 18:07:32,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-12-03 18:07:32,154 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:32,155 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 44, 1, 1, 1, 1] [2018-12-03 18:07:32,155 INFO L423 AbstractCegarLoop]: === Iteration 89 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:32,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:32,155 INFO L82 PathProgramCache]: Analyzing trace with hash -1998692683, now seen corresponding path program 87 times [2018-12-03 18:07:32,155 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:32,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:32,156 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:32,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:32,156 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:32,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:34,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:34,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:34,850 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:34,850 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:34,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:34,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:34,850 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:34,861 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:07:34,861 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:07:34,971 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:07:34,971 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:34,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:38,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:38,406 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:40,725 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 1980 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:40,745 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:40,746 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 136 [2018-12-03 18:07:40,746 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:40,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2018-12-03 18:07:40,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2018-12-03 18:07:40,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:07:40,748 INFO L87 Difference]: Start difference. First operand 138 states and 139 transitions. Second operand 137 states. [2018-12-03 18:07:44,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:44,159 INFO L93 Difference]: Finished difference Result 232 states and 234 transitions. [2018-12-03 18:07:44,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 18:07:44,159 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 137 [2018-12-03 18:07:44,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:44,160 INFO L225 Difference]: With dead ends: 232 [2018-12-03 18:07:44,160 INFO L226 Difference]: Without dead ends: 139 [2018-12-03 18:07:44,162 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 139 SyntacticMatches, 89 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11792 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=7471, Invalid=25471, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:07:44,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-12-03 18:07:44,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-12-03 18:07:44,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-12-03 18:07:44,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-12-03 18:07:44,204 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 137 [2018-12-03 18:07:44,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:44,204 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-12-03 18:07:44,204 INFO L481 AbstractCegarLoop]: Interpolant automaton has 137 states. [2018-12-03 18:07:44,204 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-12-03 18:07:44,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2018-12-03 18:07:44,204 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:44,205 INFO L402 BasicCegarLoop]: trace histogram [45, 45, 44, 1, 1, 1, 1] [2018-12-03 18:07:44,205 INFO L423 AbstractCegarLoop]: === Iteration 90 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:44,205 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:44,205 INFO L82 PathProgramCache]: Analyzing trace with hash 566565214, now seen corresponding path program 88 times [2018-12-03 18:07:44,205 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:44,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:44,206 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:07:44,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:44,206 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:44,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:45,175 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:45,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:45,175 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:45,175 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:45,175 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:45,175 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:45,176 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 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:45,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:45,185 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:07:45,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:45,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:45,360 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:45,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:46,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1035 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:46,885 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:46,886 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 50 [2018-12-03 18:07:46,886 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:46,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-12-03 18:07:46,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-12-03 18:07:46,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1181, Invalid=1369, Unknown=0, NotChecked=0, Total=2550 [2018-12-03 18:07:46,887 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 51 states. [2018-12-03 18:07:48,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:07:48,260 INFO L93 Difference]: Finished difference Result 147 states and 148 transitions. [2018-12-03 18:07:48,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 18:07:48,261 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 138 [2018-12-03 18:07:48,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:07:48,262 INFO L225 Difference]: With dead ends: 147 [2018-12-03 18:07:48,262 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 18:07:48,262 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 228 SyntacticMatches, 90 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4277 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=3482, Invalid=5830, Unknown=0, NotChecked=0, Total=9312 [2018-12-03 18:07:48,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 18:07:48,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2018-12-03 18:07:48,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2018-12-03 18:07:48,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2018-12-03 18:07:48,314 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 138 [2018-12-03 18:07:48,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:07:48,315 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2018-12-03 18:07:48,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-12-03 18:07:48,315 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2018-12-03 18:07:48,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2018-12-03 18:07:48,315 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:07:48,316 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 45, 1, 1, 1, 1] [2018-12-03 18:07:48,316 INFO L423 AbstractCegarLoop]: === Iteration 91 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:07:48,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:07:48,316 INFO L82 PathProgramCache]: Analyzing trace with hash -991742726, now seen corresponding path program 89 times [2018-12-03 18:07:48,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:07:48,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:48,317 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:07:48,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:07:48,317 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:07:48,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:07:50,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:50,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:50,910 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:07:50,910 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:07:50,910 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:07:50,910 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:07:50,910 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:07:50,919 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:07:50,919 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:07:51,115 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2018-12-03 18:07:51,116 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:07:51,121 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:07:54,530 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:54,530 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:07:56,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3105 backedges. 2070 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:07:56,928 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:07:56,928 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 139 [2018-12-03 18:07:56,928 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:07:56,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2018-12-03 18:07:56,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2018-12-03 18:07:56,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 18:07:56,930 INFO L87 Difference]: Start difference. First operand 141 states and 142 transitions. Second operand 140 states. [2018-12-03 18:08:00,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:00,441 INFO L93 Difference]: Finished difference Result 237 states and 239 transitions. [2018-12-03 18:08:00,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 18:08:00,442 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 140 [2018-12-03 18:08:00,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:00,442 INFO L225 Difference]: With dead ends: 237 [2018-12-03 18:08:00,442 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 18:08:00,444 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 142 SyntacticMatches, 91 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12330 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=7798, Invalid=26612, Unknown=0, NotChecked=0, Total=34410 [2018-12-03 18:08:00,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 18:08:00,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-12-03 18:08:00,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-12-03 18:08:00,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2018-12-03 18:08:00,487 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 140 [2018-12-03 18:08:00,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:00,487 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2018-12-03 18:08:00,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2018-12-03 18:08:00,488 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2018-12-03 18:08:00,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-12-03 18:08:00,488 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:00,488 INFO L402 BasicCegarLoop]: trace histogram [46, 46, 45, 1, 1, 1, 1] [2018-12-03 18:08:00,488 INFO L423 AbstractCegarLoop]: === Iteration 92 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:00,489 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:00,489 INFO L82 PathProgramCache]: Analyzing trace with hash 253169073, now seen corresponding path program 90 times [2018-12-03 18:08:00,489 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:00,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:00,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:00,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:00,490 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:00,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:01,682 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:01,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:01,682 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:01,682 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:01,682 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:01,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:01,683 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 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:01,692 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:08:01,692 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:08:01,805 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:08:01,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:01,812 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:01,874 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:01,874 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:03,640 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1081 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:03,662 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:03,662 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49, 49] total 51 [2018-12-03 18:08:03,662 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:03,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-03 18:08:03,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-03 18:08:03,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1230, Invalid=1422, Unknown=0, NotChecked=0, Total=2652 [2018-12-03 18:08:03,663 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand 52 states. [2018-12-03 18:08:04,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:04,841 INFO L93 Difference]: Finished difference Result 150 states and 151 transitions. [2018-12-03 18:08:04,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 18:08:04,842 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 141 [2018-12-03 18:08:04,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:04,842 INFO L225 Difference]: With dead ends: 150 [2018-12-03 18:08:04,843 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 18:08:04,843 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 233 SyntacticMatches, 92 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4464 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3628, Invalid=6074, Unknown=0, NotChecked=0, Total=9702 [2018-12-03 18:08:04,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 18:08:04,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2018-12-03 18:08:04,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-12-03 18:08:04,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 145 transitions. [2018-12-03 18:08:04,887 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 145 transitions. Word has length 141 [2018-12-03 18:08:04,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:04,888 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 145 transitions. [2018-12-03 18:08:04,888 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-03 18:08:04,888 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 145 transitions. [2018-12-03 18:08:04,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-12-03 18:08:04,888 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:04,888 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 46, 1, 1, 1, 1] [2018-12-03 18:08:04,888 INFO L423 AbstractCegarLoop]: === Iteration 93 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:04,889 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:04,889 INFO L82 PathProgramCache]: Analyzing trace with hash -1517723507, now seen corresponding path program 91 times [2018-12-03 18:08:04,889 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:04,889 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:04,889 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:04,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:04,890 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:04,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:07,604 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:07,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:07,604 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:07,604 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:07,604 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:07,604 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:07,604 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 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:07,614 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:07,615 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:08:07,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:07,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:11,197 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:11,197 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:13,949 INFO L134 CoverageAnalysis]: Checked inductivity of 3243 backedges. 2162 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:13,969 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:13,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 142 [2018-12-03 18:08:13,969 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:13,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2018-12-03 18:08:13,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2018-12-03 18:08:13,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 18:08:13,971 INFO L87 Difference]: Start difference. First operand 144 states and 145 transitions. Second operand 143 states. [2018-12-03 18:08:17,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:17,405 INFO L93 Difference]: Finished difference Result 242 states and 244 transitions. [2018-12-03 18:08:17,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 18:08:17,405 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 143 [2018-12-03 18:08:17,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:17,406 INFO L225 Difference]: With dead ends: 242 [2018-12-03 18:08:17,406 INFO L226 Difference]: Without dead ends: 145 [2018-12-03 18:08:17,407 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 145 SyntacticMatches, 93 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12880 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=8132, Invalid=27778, Unknown=0, NotChecked=0, Total=35910 [2018-12-03 18:08:17,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2018-12-03 18:08:17,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2018-12-03 18:08:17,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2018-12-03 18:08:17,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2018-12-03 18:08:17,450 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 143 [2018-12-03 18:08:17,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:17,451 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2018-12-03 18:08:17,451 INFO L481 AbstractCegarLoop]: Interpolant automaton has 143 states. [2018-12-03 18:08:17,451 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2018-12-03 18:08:17,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-12-03 18:08:17,451 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:17,451 INFO L402 BasicCegarLoop]: trace histogram [47, 47, 46, 1, 1, 1, 1] [2018-12-03 18:08:17,451 INFO L423 AbstractCegarLoop]: === Iteration 94 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:17,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:17,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1392920458, now seen corresponding path program 92 times [2018-12-03 18:08:17,452 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:17,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:17,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:17,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:17,452 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:17,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:18,520 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:18,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:18,520 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:18,520 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:18,520 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:18,520 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:18,520 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 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:18,528 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:08:18,528 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:08:18,744 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2018-12-03 18:08:18,744 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:18,749 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:18,876 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:18,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:20,528 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1128 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:20,548 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:20,548 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 52 [2018-12-03 18:08:20,548 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:20,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-12-03 18:08:20,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-12-03 18:08:20,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=1476, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:08:20,549 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand 53 states. [2018-12-03 18:08:21,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:21,769 INFO L93 Difference]: Finished difference Result 153 states and 154 transitions. [2018-12-03 18:08:21,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 18:08:21,770 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 144 [2018-12-03 18:08:21,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:21,771 INFO L225 Difference]: With dead ends: 153 [2018-12-03 18:08:21,771 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 18:08:21,772 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 238 SyntacticMatches, 94 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4655 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3777, Invalid=6323, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:08:21,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 18:08:21,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 147. [2018-12-03 18:08:21,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-12-03 18:08:21,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-12-03 18:08:21,820 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 144 [2018-12-03 18:08:21,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:21,820 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-12-03 18:08:21,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-12-03 18:08:21,820 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-12-03 18:08:21,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-12-03 18:08:21,821 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:21,821 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 47, 1, 1, 1, 1] [2018-12-03 18:08:21,821 INFO L423 AbstractCegarLoop]: === Iteration 95 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:21,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:21,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1433169426, now seen corresponding path program 93 times [2018-12-03 18:08:21,821 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:21,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:21,822 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:21,822 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:21,822 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:21,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:25,016 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:25,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:25,016 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:25,016 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:25,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:25,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:25,017 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:25,025 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:08:25,025 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:08:25,146 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:08:25,146 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:25,153 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:28,591 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:28,591 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:31,550 INFO L134 CoverageAnalysis]: Checked inductivity of 3384 backedges. 2256 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:31,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:31,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 145 [2018-12-03 18:08:31,570 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:31,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2018-12-03 18:08:31,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2018-12-03 18:08:31,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:08:31,571 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 146 states. [2018-12-03 18:08:34,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:34,295 INFO L93 Difference]: Finished difference Result 247 states and 249 transitions. [2018-12-03 18:08:34,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 18:08:34,295 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 146 [2018-12-03 18:08:34,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:34,296 INFO L225 Difference]: With dead ends: 247 [2018-12-03 18:08:34,296 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 18:08:34,297 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 148 SyntacticMatches, 95 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13442 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=8473, Invalid=28969, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:08:34,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 18:08:34,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-12-03 18:08:34,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 18:08:34,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2018-12-03 18:08:34,344 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 146 [2018-12-03 18:08:34,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:34,345 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2018-12-03 18:08:34,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2018-12-03 18:08:34,345 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2018-12-03 18:08:34,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 18:08:34,345 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:34,345 INFO L402 BasicCegarLoop]: trace histogram [48, 48, 47, 1, 1, 1, 1] [2018-12-03 18:08:34,346 INFO L423 AbstractCegarLoop]: === Iteration 96 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:34,346 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:34,346 INFO L82 PathProgramCache]: Analyzing trace with hash -876151, now seen corresponding path program 94 times [2018-12-03 18:08:34,346 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:34,346 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:34,347 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:34,347 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:34,347 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:34,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:35,440 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:35,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:35,440 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:35,440 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:35,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:35,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:35,440 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 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:35,451 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:35,451 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:08:35,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:35,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:35,633 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:35,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:37,362 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1176 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:37,381 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:37,382 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51, 51] total 53 [2018-12-03 18:08:37,382 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:37,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 18:08:37,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 18:08:37,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1331, Invalid=1531, Unknown=0, NotChecked=0, Total=2862 [2018-12-03 18:08:37,383 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand 54 states. [2018-12-03 18:08:38,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:38,612 INFO L93 Difference]: Finished difference Result 156 states and 157 transitions. [2018-12-03 18:08:38,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2018-12-03 18:08:38,612 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 147 [2018-12-03 18:08:38,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:38,613 INFO L225 Difference]: With dead ends: 156 [2018-12-03 18:08:38,613 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 18:08:38,614 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 243 SyntacticMatches, 96 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4850 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3929, Invalid=6577, Unknown=0, NotChecked=0, Total=10506 [2018-12-03 18:08:38,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 18:08:38,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 150. [2018-12-03 18:08:38,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 18:08:38,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2018-12-03 18:08:38,663 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 147 [2018-12-03 18:08:38,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:38,664 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2018-12-03 18:08:38,664 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 18:08:38,664 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2018-12-03 18:08:38,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 18:08:38,665 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:38,665 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 48, 1, 1, 1, 1] [2018-12-03 18:08:38,665 INFO L423 AbstractCegarLoop]: === Iteration 97 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:38,665 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:38,665 INFO L82 PathProgramCache]: Analyzing trace with hash -842047899, now seen corresponding path program 95 times [2018-12-03 18:08:38,665 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:38,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:38,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:08:38,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:38,666 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:38,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:41,900 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:41,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:41,901 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:41,901 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:41,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:41,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:41,901 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 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:41,913 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:08:41,913 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:08:42,133 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-12-03 18:08:42,133 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:42,138 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:45,941 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:45,942 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:48,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3528 backedges. 2352 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:48,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:48,687 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99, 99] total 148 [2018-12-03 18:08:48,687 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:48,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2018-12-03 18:08:48,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2018-12-03 18:08:48,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2018-12-03 18:08:48,689 INFO L87 Difference]: Start difference. First operand 150 states and 151 transitions. Second operand 149 states. [2018-12-03 18:08:52,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:52,808 INFO L93 Difference]: Finished difference Result 252 states and 254 transitions. [2018-12-03 18:08:52,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-12-03 18:08:52,809 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 149 [2018-12-03 18:08:52,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:52,809 INFO L225 Difference]: With dead ends: 252 [2018-12-03 18:08:52,809 INFO L226 Difference]: Without dead ends: 151 [2018-12-03 18:08:52,811 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 151 SyntacticMatches, 97 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14016 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=8821, Invalid=30185, Unknown=0, NotChecked=0, Total=39006 [2018-12-03 18:08:52,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2018-12-03 18:08:52,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2018-12-03 18:08:52,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 151 states. [2018-12-03 18:08:52,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2018-12-03 18:08:52,862 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 149 [2018-12-03 18:08:52,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:52,863 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2018-12-03 18:08:52,863 INFO L481 AbstractCegarLoop]: Interpolant automaton has 149 states. [2018-12-03 18:08:52,863 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2018-12-03 18:08:52,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2018-12-03 18:08:52,864 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:52,864 INFO L402 BasicCegarLoop]: trace histogram [49, 49, 48, 1, 1, 1, 1] [2018-12-03 18:08:52,864 INFO L423 AbstractCegarLoop]: === Iteration 98 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:52,864 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:52,864 INFO L82 PathProgramCache]: Analyzing trace with hash -454138994, now seen corresponding path program 96 times [2018-12-03 18:08:52,865 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:52,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:52,865 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:52,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:52,866 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:52,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:08:53,974 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:53,974 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:53,974 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:08:53,974 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:08:53,974 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:08:53,975 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:08:53,975 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 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:08:53,983 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:08:53,983 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:08:54,104 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:08:54,104 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:08:54,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:08:54,193 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:54,193 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:08:56,116 INFO L134 CoverageAnalysis]: Checked inductivity of 3577 backedges. 1225 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:08:56,135 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:08:56,136 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52, 52] total 54 [2018-12-03 18:08:56,136 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:08:56,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-12-03 18:08:56,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-12-03 18:08:56,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1383, Invalid=1587, Unknown=0, NotChecked=0, Total=2970 [2018-12-03 18:08:56,137 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand 55 states. [2018-12-03 18:08:57,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:08:57,449 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-12-03 18:08:57,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-12-03 18:08:57,449 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 150 [2018-12-03 18:08:57,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:08:57,451 INFO L225 Difference]: With dead ends: 159 [2018-12-03 18:08:57,451 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 18:08:57,452 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 449 GetRequests, 248 SyntacticMatches, 98 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5049 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4084, Invalid=6836, Unknown=0, NotChecked=0, Total=10920 [2018-12-03 18:08:57,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 18:08:57,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 153. [2018-12-03 18:08:57,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 153 states. [2018-12-03 18:08:57,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 154 transitions. [2018-12-03 18:08:57,503 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 154 transitions. Word has length 150 [2018-12-03 18:08:57,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:08:57,503 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 154 transitions. [2018-12-03 18:08:57,504 INFO L481 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-12-03 18:08:57,504 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 154 transitions. [2018-12-03 18:08:57,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2018-12-03 18:08:57,504 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:08:57,504 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 49, 1, 1, 1, 1] [2018-12-03 18:08:57,505 INFO L423 AbstractCegarLoop]: === Iteration 99 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:08:57,505 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:08:57,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1659024170, now seen corresponding path program 97 times [2018-12-03 18:08:57,505 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:08:57,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:57,506 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:08:57,506 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:08:57,506 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:08:57,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:00,804 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:00,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:00,805 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:00,805 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:00,805 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:00,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:00,805 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 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:00,814 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:00,815 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:09:00,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:00,936 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:04,753 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:04,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:07,778 INFO L134 CoverageAnalysis]: Checked inductivity of 3675 backedges. 2450 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:07,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:07,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 151 [2018-12-03 18:09:07,797 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:07,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2018-12-03 18:09:07,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2018-12-03 18:09:07,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:09:07,800 INFO L87 Difference]: Start difference. First operand 153 states and 154 transitions. Second operand 152 states. [2018-12-03 18:09:12,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:12,021 INFO L93 Difference]: Finished difference Result 257 states and 259 transitions. [2018-12-03 18:09:12,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2018-12-03 18:09:12,022 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 152 [2018-12-03 18:09:12,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:12,022 INFO L225 Difference]: With dead ends: 257 [2018-12-03 18:09:12,022 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 18:09:12,024 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 154 SyntacticMatches, 99 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14602 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=9176, Invalid=31426, Unknown=0, NotChecked=0, Total=40602 [2018-12-03 18:09:12,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 18:09:12,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-12-03 18:09:12,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-12-03 18:09:12,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-12-03 18:09:12,077 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 152 [2018-12-03 18:09:12,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:12,077 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-12-03 18:09:12,077 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2018-12-03 18:09:12,078 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-12-03 18:09:12,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-12-03 18:09:12,078 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:12,078 INFO L402 BasicCegarLoop]: trace histogram [50, 50, 49, 1, 1, 1, 1] [2018-12-03 18:09:12,078 INFO L423 AbstractCegarLoop]: === Iteration 100 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:12,079 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:12,079 INFO L82 PathProgramCache]: Analyzing trace with hash 96219489, now seen corresponding path program 98 times [2018-12-03 18:09:12,079 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:12,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:12,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:12,080 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:12,080 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:12,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:13,265 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:13,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:13,266 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:13,266 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:13,266 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:13,266 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:13,266 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 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:13,274 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:09:13,274 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:09:13,504 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2018-12-03 18:09:13,504 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:13,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:13,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:13,579 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:15,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1275 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:15,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:15,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 53] total 55 [2018-12-03 18:09:15,521 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:15,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 18:09:15,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 18:09:15,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1436, Invalid=1644, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:09:15,522 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 56 states. [2018-12-03 18:09:16,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:16,869 INFO L93 Difference]: Finished difference Result 162 states and 163 transitions. [2018-12-03 18:09:16,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2018-12-03 18:09:16,870 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 153 [2018-12-03 18:09:16,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:16,871 INFO L225 Difference]: With dead ends: 162 [2018-12-03 18:09:16,871 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 18:09:16,872 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 253 SyntacticMatches, 100 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5252 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=4242, Invalid=7100, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:09:16,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 18:09:16,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 156. [2018-12-03 18:09:16,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-12-03 18:09:16,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 157 transitions. [2018-12-03 18:09:16,923 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 157 transitions. Word has length 153 [2018-12-03 18:09:16,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:16,923 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 157 transitions. [2018-12-03 18:09:16,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 18:09:16,924 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 157 transitions. [2018-12-03 18:09:16,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-12-03 18:09:16,924 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:16,924 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 50, 1, 1, 1, 1] [2018-12-03 18:09:16,925 INFO L423 AbstractCegarLoop]: === Iteration 101 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:16,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:16,925 INFO L82 PathProgramCache]: Analyzing trace with hash -2022418371, now seen corresponding path program 99 times [2018-12-03 18:09:16,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:16,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:16,926 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:16,926 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:16,926 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:16,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:20,368 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:20,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:20,369 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:20,369 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:20,369 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:20,369 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:20,369 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 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:20,380 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:09:20,380 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:09:20,490 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:09:20,491 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:20,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:24,290 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:24,291 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:27,502 INFO L134 CoverageAnalysis]: Checked inductivity of 3825 backedges. 2550 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:27,522 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:27,523 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 103, 103] total 154 [2018-12-03 18:09:27,523 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:27,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 155 states [2018-12-03 18:09:27,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2018-12-03 18:09:27,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5458, Invalid=18412, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 18:09:27,525 INFO L87 Difference]: Start difference. First operand 156 states and 157 transitions. Second operand 155 states. [2018-12-03 18:09:31,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:31,874 INFO L93 Difference]: Finished difference Result 262 states and 264 transitions. [2018-12-03 18:09:31,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2018-12-03 18:09:31,874 INFO L78 Accepts]: Start accepts. Automaton has 155 states. Word has length 155 [2018-12-03 18:09:31,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:31,874 INFO L225 Difference]: With dead ends: 262 [2018-12-03 18:09:31,875 INFO L226 Difference]: Without dead ends: 157 [2018-12-03 18:09:31,876 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 157 SyntacticMatches, 101 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15200 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=9538, Invalid=32692, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:09:31,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-12-03 18:09:31,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-12-03 18:09:31,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-12-03 18:09:31,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-12-03 18:09:31,930 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 155 [2018-12-03 18:09:31,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:31,930 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-12-03 18:09:31,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has 155 states. [2018-12-03 18:09:31,930 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-12-03 18:09:31,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-12-03 18:09:31,930 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:31,931 INFO L402 BasicCegarLoop]: trace histogram [51, 51, 50, 1, 1, 1, 1] [2018-12-03 18:09:31,931 INFO L423 AbstractCegarLoop]: === Iteration 102 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:31,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:31,931 INFO L82 PathProgramCache]: Analyzing trace with hash -2091181402, now seen corresponding path program 100 times [2018-12-03 18:09:31,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:31,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:31,932 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:31,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:31,932 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:31,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:33,122 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:33,122 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:33,122 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:33,122 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:33,123 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:33,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:33,123 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 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:33,131 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:33,131 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:09:33,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:33,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:33,322 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:33,323 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:35,245 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1326 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:35,265 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:35,265 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 56 [2018-12-03 18:09:35,265 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:35,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-12-03 18:09:35,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-12-03 18:09:35,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1490, Invalid=1702, Unknown=0, NotChecked=0, Total=3192 [2018-12-03 18:09:35,266 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 57 states. [2018-12-03 18:09:36,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:36,807 INFO L93 Difference]: Finished difference Result 165 states and 166 transitions. [2018-12-03 18:09:36,807 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2018-12-03 18:09:36,807 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 156 [2018-12-03 18:09:36,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:36,809 INFO L225 Difference]: With dead ends: 165 [2018-12-03 18:09:36,809 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 18:09:36,810 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 467 GetRequests, 258 SyntacticMatches, 102 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5459 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=4403, Invalid=7369, Unknown=0, NotChecked=0, Total=11772 [2018-12-03 18:09:36,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 18:09:36,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 159. [2018-12-03 18:09:36,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-12-03 18:09:36,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-12-03 18:09:36,868 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 156 [2018-12-03 18:09:36,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:36,868 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-12-03 18:09:36,868 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-12-03 18:09:36,868 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-12-03 18:09:36,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-12-03 18:09:36,868 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:36,869 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 51, 1, 1, 1, 1] [2018-12-03 18:09:36,869 INFO L423 AbstractCegarLoop]: === Iteration 103 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:36,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:36,869 INFO L82 PathProgramCache]: Analyzing trace with hash 419300418, now seen corresponding path program 101 times [2018-12-03 18:09:36,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:36,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:36,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:09:36,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:36,870 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:36,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:40,185 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:40,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:40,186 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:40,186 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:40,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:40,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:40,186 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 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:40,196 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:09:40,196 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:09:40,447 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2018-12-03 18:09:40,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:40,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:44,623 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:44,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:47,762 INFO L134 CoverageAnalysis]: Checked inductivity of 3978 backedges. 2652 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:47,782 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:47,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 105, 105] total 157 [2018-12-03 18:09:47,782 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:47,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2018-12-03 18:09:47,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2018-12-03 18:09:47,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5669, Invalid=19137, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:09:47,784 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 158 states. [2018-12-03 18:09:52,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:52,290 INFO L93 Difference]: Finished difference Result 267 states and 269 transitions. [2018-12-03 18:09:52,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2018-12-03 18:09:52,290 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 158 [2018-12-03 18:09:52,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:52,291 INFO L225 Difference]: With dead ends: 267 [2018-12-03 18:09:52,291 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 18:09:52,293 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 160 SyntacticMatches, 103 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15810 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=9907, Invalid=33983, Unknown=0, NotChecked=0, Total=43890 [2018-12-03 18:09:52,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 18:09:52,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-12-03 18:09:52,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 18:09:52,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-12-03 18:09:52,365 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 158 [2018-12-03 18:09:52,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:52,365 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-12-03 18:09:52,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2018-12-03 18:09:52,365 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-12-03 18:09:52,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 18:09:52,366 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:52,366 INFO L402 BasicCegarLoop]: trace histogram [52, 52, 51, 1, 1, 1, 1] [2018-12-03 18:09:52,366 INFO L423 AbstractCegarLoop]: === Iteration 104 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:52,366 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:52,366 INFO L82 PathProgramCache]: Analyzing trace with hash 599244089, now seen corresponding path program 102 times [2018-12-03 18:09:52,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:52,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:52,367 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:52,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:52,367 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:52,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:09:53,594 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:53,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:53,594 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:09:53,594 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:09:53,594 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:09:53,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:09:53,594 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 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:09:53,604 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:09:53,605 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:09:53,734 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:09:53,734 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:09:53,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:09:53,819 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:53,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:09:55,780 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1378 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:09:55,799 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:09:55,800 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 55, 55] total 57 [2018-12-03 18:09:55,800 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:09:55,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 18:09:55,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 18:09:55,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1545, Invalid=1761, Unknown=0, NotChecked=0, Total=3306 [2018-12-03 18:09:55,801 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 58 states. [2018-12-03 18:09:57,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:09:57,342 INFO L93 Difference]: Finished difference Result 168 states and 169 transitions. [2018-12-03 18:09:57,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2018-12-03 18:09:57,342 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 159 [2018-12-03 18:09:57,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:09:57,343 INFO L225 Difference]: With dead ends: 168 [2018-12-03 18:09:57,343 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 18:09:57,344 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 476 GetRequests, 263 SyntacticMatches, 104 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5670 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4567, Invalid=7643, Unknown=0, NotChecked=0, Total=12210 [2018-12-03 18:09:57,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 18:09:57,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 162. [2018-12-03 18:09:57,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-12-03 18:09:57,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 163 transitions. [2018-12-03 18:09:57,414 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 163 transitions. Word has length 159 [2018-12-03 18:09:57,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:09:57,414 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 163 transitions. [2018-12-03 18:09:57,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 18:09:57,414 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 163 transitions. [2018-12-03 18:09:57,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-12-03 18:09:57,415 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:09:57,415 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 52, 1, 1, 1, 1] [2018-12-03 18:09:57,415 INFO L423 AbstractCegarLoop]: === Iteration 105 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:09:57,415 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:09:57,415 INFO L82 PathProgramCache]: Analyzing trace with hash 347885077, now seen corresponding path program 103 times [2018-12-03 18:09:57,415 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:09:57,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:57,416 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:09:57,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:09:57,416 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:09:57,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:00,770 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:00,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:00,770 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:00,771 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:00,771 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:00,771 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:00,771 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 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:00,779 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:00,779 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:00,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:00,905 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:05,292 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:05,292 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:08,734 INFO L134 CoverageAnalysis]: Checked inductivity of 4134 backedges. 2756 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:08,753 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:08,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 107, 107] total 160 [2018-12-03 18:10:08,753 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:08,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 161 states [2018-12-03 18:10:08,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2018-12-03 18:10:08,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5884, Invalid=19876, Unknown=0, NotChecked=0, Total=25760 [2018-12-03 18:10:08,755 INFO L87 Difference]: Start difference. First operand 162 states and 163 transitions. Second operand 161 states. [2018-12-03 18:10:13,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:13,374 INFO L93 Difference]: Finished difference Result 272 states and 274 transitions. [2018-12-03 18:10:13,374 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2018-12-03 18:10:13,374 INFO L78 Accepts]: Start accepts. Automaton has 161 states. Word has length 161 [2018-12-03 18:10:13,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:13,375 INFO L225 Difference]: With dead ends: 272 [2018-12-03 18:10:13,375 INFO L226 Difference]: Without dead ends: 163 [2018-12-03 18:10:13,377 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 163 SyntacticMatches, 105 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16432 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=10283, Invalid=35299, Unknown=0, NotChecked=0, Total=45582 [2018-12-03 18:10:13,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-12-03 18:10:13,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 163. [2018-12-03 18:10:13,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2018-12-03 18:10:13,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2018-12-03 18:10:13,438 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 161 [2018-12-03 18:10:13,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:13,438 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2018-12-03 18:10:13,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has 161 states. [2018-12-03 18:10:13,438 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2018-12-03 18:10:13,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-12-03 18:10:13,439 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:13,439 INFO L402 BasicCegarLoop]: trace histogram [53, 53, 52, 1, 1, 1, 1] [2018-12-03 18:10:13,439 INFO L423 AbstractCegarLoop]: === Iteration 106 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:13,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:13,440 INFO L82 PathProgramCache]: Analyzing trace with hash 930602430, now seen corresponding path program 104 times [2018-12-03 18:10:13,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:13,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:13,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:13,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:13,440 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:13,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:14,717 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:14,717 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:14,717 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:14,718 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:14,718 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:14,718 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:14,718 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 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:14,726 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:14,726 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:14,975 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2018-12-03 18:10:14,975 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:14,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:15,055 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:15,055 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:17,206 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1431 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:17,226 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:17,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 56, 56] total 58 [2018-12-03 18:10:17,226 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:17,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-12-03 18:10:17,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-12-03 18:10:17,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1601, Invalid=1821, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:10:17,227 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand 59 states. [2018-12-03 18:10:18,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:18,739 INFO L93 Difference]: Finished difference Result 171 states and 172 transitions. [2018-12-03 18:10:18,739 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2018-12-03 18:10:18,739 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 162 [2018-12-03 18:10:18,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:18,740 INFO L225 Difference]: With dead ends: 171 [2018-12-03 18:10:18,740 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 18:10:18,741 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 268 SyntacticMatches, 106 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5885 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=4734, Invalid=7922, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:10:18,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 18:10:18,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 165. [2018-12-03 18:10:18,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 165 states. [2018-12-03 18:10:18,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 166 transitions. [2018-12-03 18:10:18,803 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 166 transitions. Word has length 162 [2018-12-03 18:10:18,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:18,803 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 166 transitions. [2018-12-03 18:10:18,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-12-03 18:10:18,803 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 166 transitions. [2018-12-03 18:10:18,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-12-03 18:10:18,803 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:18,803 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 53, 1, 1, 1, 1] [2018-12-03 18:10:18,804 INFO L423 AbstractCegarLoop]: === Iteration 107 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:18,804 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:18,804 INFO L82 PathProgramCache]: Analyzing trace with hash 955670874, now seen corresponding path program 105 times [2018-12-03 18:10:18,804 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:18,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:18,805 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:18,805 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:18,805 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:18,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:22,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:22,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:22,477 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:22,477 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:22,477 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:22,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:22,477 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 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:22,486 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:22,486 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:22,616 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:22,616 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:22,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:27,153 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:27,154 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:30,445 INFO L134 CoverageAnalysis]: Checked inductivity of 4293 backedges. 2862 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:30,466 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:30,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 109, 109] total 163 [2018-12-03 18:10:30,466 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:30,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2018-12-03 18:10:30,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2018-12-03 18:10:30,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6103, Invalid=20629, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:10:30,468 INFO L87 Difference]: Start difference. First operand 165 states and 166 transitions. Second operand 164 states. [2018-12-03 18:10:33,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:33,748 INFO L93 Difference]: Finished difference Result 277 states and 279 transitions. [2018-12-03 18:10:33,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2018-12-03 18:10:33,748 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 164 [2018-12-03 18:10:33,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:33,748 INFO L225 Difference]: With dead ends: 277 [2018-12-03 18:10:33,749 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 18:10:33,750 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 166 SyntacticMatches, 107 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17066 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=10666, Invalid=36640, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:10:33,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 18:10:33,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2018-12-03 18:10:33,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-12-03 18:10:33,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-12-03 18:10:33,834 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 164 [2018-12-03 18:10:33,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:33,834 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-12-03 18:10:33,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2018-12-03 18:10:33,834 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-12-03 18:10:33,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-12-03 18:10:33,835 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:33,835 INFO L402 BasicCegarLoop]: trace histogram [54, 54, 53, 1, 1, 1, 1] [2018-12-03 18:10:33,835 INFO L423 AbstractCegarLoop]: === Iteration 108 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:33,835 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:33,836 INFO L82 PathProgramCache]: Analyzing trace with hash 430523665, now seen corresponding path program 106 times [2018-12-03 18:10:33,836 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:33,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:33,836 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:33,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:33,837 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:33,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:35,182 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:35,182 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:35,183 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:35,183 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:35,183 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:35,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:35,183 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 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:35,192 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:35,192 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:10:35,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:35,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:35,398 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:35,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:37,701 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1485 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:37,720 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:37,720 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57, 57] total 59 [2018-12-03 18:10:37,720 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:37,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 18:10:37,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 18:10:37,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1658, Invalid=1882, Unknown=0, NotChecked=0, Total=3540 [2018-12-03 18:10:37,721 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 60 states. [2018-12-03 18:10:39,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:39,220 INFO L93 Difference]: Finished difference Result 174 states and 175 transitions. [2018-12-03 18:10:39,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2018-12-03 18:10:39,221 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 165 [2018-12-03 18:10:39,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:39,221 INFO L225 Difference]: With dead ends: 174 [2018-12-03 18:10:39,221 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 18:10:39,222 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 273 SyntacticMatches, 108 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6104 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=4904, Invalid=8206, Unknown=0, NotChecked=0, Total=13110 [2018-12-03 18:10:39,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 18:10:39,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 168. [2018-12-03 18:10:39,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 18:10:39,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 169 transitions. [2018-12-03 18:10:39,287 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 169 transitions. Word has length 165 [2018-12-03 18:10:39,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:39,287 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 169 transitions. [2018-12-03 18:10:39,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 18:10:39,287 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 169 transitions. [2018-12-03 18:10:39,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 18:10:39,288 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:39,288 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 54, 1, 1, 1, 1] [2018-12-03 18:10:39,288 INFO L423 AbstractCegarLoop]: === Iteration 109 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:39,288 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:39,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1416314861, now seen corresponding path program 107 times [2018-12-03 18:10:39,288 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:39,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:39,289 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:10:39,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:39,289 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:39,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:43,149 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:43,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:43,150 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:43,150 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:43,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:43,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:43,150 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 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:43,158 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:10:43,158 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:10:43,431 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-12-03 18:10:43,431 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:43,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:48,188 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:48,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:10:51,592 INFO L134 CoverageAnalysis]: Checked inductivity of 4455 backedges. 2970 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:51,611 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:10:51,612 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 111, 111] total 166 [2018-12-03 18:10:51,612 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:10:51,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 167 states [2018-12-03 18:10:51,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2018-12-03 18:10:51,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6326, Invalid=21396, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 18:10:51,614 INFO L87 Difference]: Start difference. First operand 168 states and 169 transitions. Second operand 167 states. [2018-12-03 18:10:56,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:10:56,520 INFO L93 Difference]: Finished difference Result 282 states and 284 transitions. [2018-12-03 18:10:56,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2018-12-03 18:10:56,520 INFO L78 Accepts]: Start accepts. Automaton has 167 states. Word has length 167 [2018-12-03 18:10:56,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:10:56,521 INFO L225 Difference]: With dead ends: 282 [2018-12-03 18:10:56,521 INFO L226 Difference]: Without dead ends: 169 [2018-12-03 18:10:56,523 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 169 SyntacticMatches, 109 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17712 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=11056, Invalid=38006, Unknown=0, NotChecked=0, Total=49062 [2018-12-03 18:10:56,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-12-03 18:10:56,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-12-03 18:10:56,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-12-03 18:10:56,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-12-03 18:10:56,590 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 167 [2018-12-03 18:10:56,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:10:56,590 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-12-03 18:10:56,590 INFO L481 AbstractCegarLoop]: Interpolant automaton has 167 states. [2018-12-03 18:10:56,590 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-12-03 18:10:56,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-12-03 18:10:56,591 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:10:56,591 INFO L402 BasicCegarLoop]: trace histogram [55, 55, 54, 1, 1, 1, 1] [2018-12-03 18:10:56,591 INFO L423 AbstractCegarLoop]: === Iteration 110 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:10:56,591 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:10:56,592 INFO L82 PathProgramCache]: Analyzing trace with hash -973296426, now seen corresponding path program 108 times [2018-12-03 18:10:56,592 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:10:56,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:56,593 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:10:56,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:10:56,593 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:10:56,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:10:58,143 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:58,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:58,143 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:10:58,143 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:10:58,143 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:10:58,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:10:58,143 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 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:10:58,151 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:10:58,152 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:10:58,313 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:10:58,314 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:10:58,323 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:10:58,398 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:10:58,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:00,560 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1540 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:00,581 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:00,581 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 60 [2018-12-03 18:11:00,581 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:00,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-12-03 18:11:00,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-12-03 18:11:00,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1716, Invalid=1944, Unknown=0, NotChecked=0, Total=3660 [2018-12-03 18:11:00,582 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 61 states. [2018-12-03 18:11:02,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:02,165 INFO L93 Difference]: Finished difference Result 177 states and 178 transitions. [2018-12-03 18:11:02,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2018-12-03 18:11:02,165 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 168 [2018-12-03 18:11:02,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:02,166 INFO L225 Difference]: With dead ends: 177 [2018-12-03 18:11:02,166 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 18:11:02,167 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 278 SyntacticMatches, 110 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6327 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=5077, Invalid=8495, Unknown=0, NotChecked=0, Total=13572 [2018-12-03 18:11:02,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 18:11:02,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 171. [2018-12-03 18:11:02,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-12-03 18:11:02,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 172 transitions. [2018-12-03 18:11:02,242 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 172 transitions. Word has length 168 [2018-12-03 18:11:02,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:02,242 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 172 transitions. [2018-12-03 18:11:02,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-12-03 18:11:02,242 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 172 transitions. [2018-12-03 18:11:02,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2018-12-03 18:11:02,243 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:02,243 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 55, 1, 1, 1, 1] [2018-12-03 18:11:02,243 INFO L423 AbstractCegarLoop]: === Iteration 111 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:02,243 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:02,244 INFO L82 PathProgramCache]: Analyzing trace with hash 964938354, now seen corresponding path program 109 times [2018-12-03 18:11:02,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:02,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:02,244 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:02,244 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:02,245 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:02,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:06,297 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:06,297 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:06,297 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:06,297 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:06,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:06,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:06,298 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 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:06,306 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:06,306 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:06,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:06,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:11,383 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:11,383 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:15,229 INFO L134 CoverageAnalysis]: Checked inductivity of 4620 backedges. 3080 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:15,248 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:15,249 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [113, 113, 113] total 169 [2018-12-03 18:11:15,249 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:15,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2018-12-03 18:11:15,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2018-12-03 18:11:15,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6553, Invalid=22177, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:11:15,251 INFO L87 Difference]: Start difference. First operand 171 states and 172 transitions. Second operand 170 states. [2018-12-03 18:11:20,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:20,382 INFO L93 Difference]: Finished difference Result 287 states and 289 transitions. [2018-12-03 18:11:20,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2018-12-03 18:11:20,382 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 170 [2018-12-03 18:11:20,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:20,382 INFO L225 Difference]: With dead ends: 287 [2018-12-03 18:11:20,382 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 18:11:20,384 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 507 GetRequests, 172 SyntacticMatches, 111 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18370 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=11453, Invalid=39397, Unknown=0, NotChecked=0, Total=50850 [2018-12-03 18:11:20,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 18:11:20,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-12-03 18:11:20,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 18:11:20,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2018-12-03 18:11:20,445 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 170 [2018-12-03 18:11:20,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:20,445 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2018-12-03 18:11:20,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2018-12-03 18:11:20,445 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2018-12-03 18:11:20,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 18:11:20,445 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:20,446 INFO L402 BasicCegarLoop]: trace histogram [56, 56, 55, 1, 1, 1, 1] [2018-12-03 18:11:20,446 INFO L423 AbstractCegarLoop]: === Iteration 112 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:20,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:20,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1138018537, now seen corresponding path program 110 times [2018-12-03 18:11:20,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:20,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:20,447 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:20,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:20,447 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:20,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:21,854 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:21,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:21,854 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:21,855 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:21,855 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:21,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:21,855 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 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:21,863 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:21,863 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:22,149 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2018-12-03 18:11:22,149 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:22,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:22,235 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:22,236 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:24,753 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1596 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:24,773 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:24,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 59, 59] total 61 [2018-12-03 18:11:24,774 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:24,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 18:11:24,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 18:11:24,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1775, Invalid=2007, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:11:24,775 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand 62 states. [2018-12-03 18:11:26,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:26,401 INFO L93 Difference]: Finished difference Result 180 states and 181 transitions. [2018-12-03 18:11:26,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2018-12-03 18:11:26,401 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 171 [2018-12-03 18:11:26,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:26,402 INFO L225 Difference]: With dead ends: 180 [2018-12-03 18:11:26,402 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 18:11:26,403 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 283 SyntacticMatches, 112 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6554 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5253, Invalid=8789, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:11:26,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 18:11:26,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 174. [2018-12-03 18:11:26,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-12-03 18:11:26,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 175 transitions. [2018-12-03 18:11:26,471 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 175 transitions. Word has length 171 [2018-12-03 18:11:26,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:26,471 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 175 transitions. [2018-12-03 18:11:26,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 18:11:26,471 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 175 transitions. [2018-12-03 18:11:26,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-12-03 18:11:26,472 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:26,472 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 56, 1, 1, 1, 1] [2018-12-03 18:11:26,472 INFO L423 AbstractCegarLoop]: === Iteration 113 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:26,472 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:26,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1580913211, now seen corresponding path program 111 times [2018-12-03 18:11:26,473 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:26,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:26,473 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:26,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:26,473 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:26,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:30,689 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:30,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:30,690 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:30,690 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:30,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:30,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:30,690 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 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:30,699 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:11:30,699 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:11:30,841 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:11:30,841 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:30,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:35,935 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:35,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:39,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4788 backedges. 3192 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:39,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:39,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 115, 115] total 172 [2018-12-03 18:11:39,797 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:39,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 173 states [2018-12-03 18:11:39,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2018-12-03 18:11:39,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6784, Invalid=22972, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 18:11:39,799 INFO L87 Difference]: Start difference. First operand 174 states and 175 transitions. Second operand 173 states. [2018-12-03 18:11:45,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:45,098 INFO L93 Difference]: Finished difference Result 292 states and 294 transitions. [2018-12-03 18:11:45,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2018-12-03 18:11:45,098 INFO L78 Accepts]: Start accepts. Automaton has 173 states. Word has length 173 [2018-12-03 18:11:45,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:45,099 INFO L225 Difference]: With dead ends: 292 [2018-12-03 18:11:45,099 INFO L226 Difference]: Without dead ends: 175 [2018-12-03 18:11:45,100 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 516 GetRequests, 175 SyntacticMatches, 113 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19040 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=11857, Invalid=40813, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 18:11:45,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2018-12-03 18:11:45,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2018-12-03 18:11:45,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-12-03 18:11:45,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2018-12-03 18:11:45,170 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 173 [2018-12-03 18:11:45,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:45,170 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2018-12-03 18:11:45,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has 173 states. [2018-12-03 18:11:45,170 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2018-12-03 18:11:45,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-12-03 18:11:45,171 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:45,171 INFO L402 BasicCegarLoop]: trace histogram [57, 57, 56, 1, 1, 1, 1] [2018-12-03 18:11:45,171 INFO L423 AbstractCegarLoop]: === Iteration 114 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:45,172 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:45,172 INFO L82 PathProgramCache]: Analyzing trace with hash 690063342, now seen corresponding path program 112 times [2018-12-03 18:11:45,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:45,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:45,172 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:11:45,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:45,173 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:45,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:46,615 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:46,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:46,615 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:46,615 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:46,615 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:46,615 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:46,615 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 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:46,623 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:46,623 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:11:46,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:46,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:11:46,843 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:46,844 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:11:49,369 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1653 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:49,388 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:11:49,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 60, 60] total 62 [2018-12-03 18:11:49,388 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:11:49,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-12-03 18:11:49,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-12-03 18:11:49,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1835, Invalid=2071, Unknown=0, NotChecked=0, Total=3906 [2018-12-03 18:11:49,389 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand 63 states. [2018-12-03 18:11:51,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:11:51,045 INFO L93 Difference]: Finished difference Result 183 states and 184 transitions. [2018-12-03 18:11:51,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 119 states. [2018-12-03 18:11:51,045 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 174 [2018-12-03 18:11:51,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:11:51,045 INFO L225 Difference]: With dead ends: 183 [2018-12-03 18:11:51,046 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 18:11:51,047 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 521 GetRequests, 288 SyntacticMatches, 114 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6785 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5432, Invalid=9088, Unknown=0, NotChecked=0, Total=14520 [2018-12-03 18:11:51,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 18:11:51,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 177. [2018-12-03 18:11:51,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-12-03 18:11:51,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-12-03 18:11:51,142 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 174 [2018-12-03 18:11:51,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:11:51,142 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-12-03 18:11:51,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-12-03 18:11:51,142 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-12-03 18:11:51,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-12-03 18:11:51,143 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:11:51,143 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 57, 1, 1, 1, 1] [2018-12-03 18:11:51,143 INFO L423 AbstractCegarLoop]: === Iteration 115 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:11:51,143 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:11:51,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1725841290, now seen corresponding path program 113 times [2018-12-03 18:11:51,143 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:11:51,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:51,144 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:11:51,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:11:51,144 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:11:51,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:11:55,335 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:11:55,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:55,336 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:11:55,336 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:11:55,336 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:11:55,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:11:55,336 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 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:11:55,344 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:11:55,345 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:11:55,643 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 58 check-sat command(s) [2018-12-03 18:11:55,643 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:11:55,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:00,844 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:00,844 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:04,872 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 3306 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:04,892 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:04,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 175 [2018-12-03 18:12:04,892 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:04,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2018-12-03 18:12:04,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2018-12-03 18:12:04,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7019, Invalid=23781, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 18:12:04,894 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 176 states. [2018-12-03 18:12:10,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:10,463 INFO L93 Difference]: Finished difference Result 297 states and 299 transitions. [2018-12-03 18:12:10,463 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2018-12-03 18:12:10,464 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 176 [2018-12-03 18:12:10,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:10,464 INFO L225 Difference]: With dead ends: 297 [2018-12-03 18:12:10,464 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 18:12:10,465 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 178 SyntacticMatches, 115 SemanticMatches, 232 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19722 ImplicationChecksByTransitivity, 15.9s TimeCoverageRelationStatistics Valid=12268, Invalid=42254, Unknown=0, NotChecked=0, Total=54522 [2018-12-03 18:12:10,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 18:12:10,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-12-03 18:12:10,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 18:12:10,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2018-12-03 18:12:10,534 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 176 [2018-12-03 18:12:10,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:10,534 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2018-12-03 18:12:10,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2018-12-03 18:12:10,535 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2018-12-03 18:12:10,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 18:12:10,535 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:10,535 INFO L402 BasicCegarLoop]: trace histogram [58, 58, 57, 1, 1, 1, 1] [2018-12-03 18:12:10,535 INFO L423 AbstractCegarLoop]: === Iteration 116 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:10,535 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:10,536 INFO L82 PathProgramCache]: Analyzing trace with hash 2063485121, now seen corresponding path program 114 times [2018-12-03 18:12:10,536 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:10,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:10,536 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:10,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:10,536 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:10,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:12,020 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:12,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:12,020 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:12,020 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:12,020 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:12,020 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:12,020 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 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:12,029 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:12:12,029 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:12:12,178 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:12:12,178 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:12,190 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:12,286 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:12,286 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:14,861 INFO L134 CoverageAnalysis]: Checked inductivity of 5017 backedges. 1711 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:14,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:14,880 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 61, 61] total 63 [2018-12-03 18:12:14,881 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:14,881 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-12-03 18:12:14,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-12-03 18:12:14,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1896, Invalid=2136, Unknown=0, NotChecked=0, Total=4032 [2018-12-03 18:12:14,882 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand 64 states. [2018-12-03 18:12:16,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:16,562 INFO L93 Difference]: Finished difference Result 186 states and 187 transitions. [2018-12-03 18:12:16,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-12-03 18:12:16,562 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 177 [2018-12-03 18:12:16,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:16,563 INFO L225 Difference]: With dead ends: 186 [2018-12-03 18:12:16,563 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 18:12:16,564 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 293 SyntacticMatches, 116 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7020 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5614, Invalid=9392, Unknown=0, NotChecked=0, Total=15006 [2018-12-03 18:12:16,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 18:12:16,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 180. [2018-12-03 18:12:16,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-12-03 18:12:16,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 181 transitions. [2018-12-03 18:12:16,637 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 181 transitions. Word has length 177 [2018-12-03 18:12:16,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:16,637 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 181 transitions. [2018-12-03 18:12:16,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-12-03 18:12:16,637 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 181 transitions. [2018-12-03 18:12:16,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-12-03 18:12:16,637 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:16,637 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 58, 1, 1, 1, 1] [2018-12-03 18:12:16,638 INFO L423 AbstractCegarLoop]: === Iteration 117 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:16,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:16,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1265756259, now seen corresponding path program 115 times [2018-12-03 18:12:16,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:16,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:16,639 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:16,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:16,639 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:16,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:20,986 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:20,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:20,987 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:20,987 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:20,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:20,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:20,987 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:20,996 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:20,996 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:12:21,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:21,135 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:26,585 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:26,585 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:30,787 INFO L134 CoverageAnalysis]: Checked inductivity of 5133 backedges. 3422 proven. 1711 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:30,806 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:30,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 119, 119] total 178 [2018-12-03 18:12:30,806 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:30,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 179 states [2018-12-03 18:12:30,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2018-12-03 18:12:30,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7258, Invalid=24604, Unknown=0, NotChecked=0, Total=31862 [2018-12-03 18:12:30,808 INFO L87 Difference]: Start difference. First operand 180 states and 181 transitions. Second operand 179 states. [2018-12-03 18:12:36,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:36,423 INFO L93 Difference]: Finished difference Result 302 states and 304 transitions. [2018-12-03 18:12:36,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2018-12-03 18:12:36,423 INFO L78 Accepts]: Start accepts. Automaton has 179 states. Word has length 179 [2018-12-03 18:12:36,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:36,424 INFO L225 Difference]: With dead ends: 302 [2018-12-03 18:12:36,424 INFO L226 Difference]: Without dead ends: 181 [2018-12-03 18:12:36,425 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 181 SyntacticMatches, 117 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20416 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=12686, Invalid=43720, Unknown=0, NotChecked=0, Total=56406 [2018-12-03 18:12:36,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2018-12-03 18:12:36,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 181. [2018-12-03 18:12:36,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-12-03 18:12:36,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 182 transitions. [2018-12-03 18:12:36,497 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 182 transitions. Word has length 179 [2018-12-03 18:12:36,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:36,497 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 182 transitions. [2018-12-03 18:12:36,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has 179 states. [2018-12-03 18:12:36,497 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 182 transitions. [2018-12-03 18:12:36,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2018-12-03 18:12:36,498 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:36,498 INFO L402 BasicCegarLoop]: trace histogram [59, 59, 58, 1, 1, 1, 1] [2018-12-03 18:12:36,498 INFO L423 AbstractCegarLoop]: === Iteration 118 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:36,498 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:36,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1331794170, now seen corresponding path program 116 times [2018-12-03 18:12:36,498 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:36,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:36,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:12:36,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:36,499 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:36,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:38,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:38,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:38,040 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:38,040 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:38,040 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:38,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:38,040 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 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:38,049 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:12:38,049 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:12:38,360 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2018-12-03 18:12:38,361 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:38,367 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:38,449 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:38,449 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:41,178 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1770 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:41,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:41,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 64 [2018-12-03 18:12:41,198 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:41,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-12-03 18:12:41,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-12-03 18:12:41,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1958, Invalid=2202, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:12:41,199 INFO L87 Difference]: Start difference. First operand 181 states and 182 transitions. Second operand 65 states. [2018-12-03 18:12:42,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:12:42,906 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-12-03 18:12:42,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2018-12-03 18:12:42,906 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 180 [2018-12-03 18:12:42,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:12:42,907 INFO L225 Difference]: With dead ends: 189 [2018-12-03 18:12:42,907 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 18:12:42,908 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 298 SyntacticMatches, 118 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7259 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5799, Invalid=9701, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 18:12:42,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 18:12:42,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 183. [2018-12-03 18:12:42,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-12-03 18:12:42,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 184 transitions. [2018-12-03 18:12:42,977 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 184 transitions. Word has length 180 [2018-12-03 18:12:42,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:12:42,977 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 184 transitions. [2018-12-03 18:12:42,977 INFO L481 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-12-03 18:12:42,977 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 184 transitions. [2018-12-03 18:12:42,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2018-12-03 18:12:42,977 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:12:42,978 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 59, 1, 1, 1, 1] [2018-12-03 18:12:42,978 INFO L423 AbstractCegarLoop]: === Iteration 119 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:12:42,978 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:12:42,978 INFO L82 PathProgramCache]: Analyzing trace with hash 45990050, now seen corresponding path program 117 times [2018-12-03 18:12:42,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:12:42,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:42,979 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:12:42,979 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:12:42,979 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:12:43,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:12:47,480 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:47,480 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:47,480 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:12:47,480 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:12:47,481 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:12:47,481 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:12:47,481 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 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:12:47,489 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:12:47,489 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:12:47,638 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:12:47,638 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:12:47,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:12:53,177 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:53,178 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:12:57,467 INFO L134 CoverageAnalysis]: Checked inductivity of 5310 backedges. 3540 proven. 1770 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:12:57,488 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:12:57,488 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 181 [2018-12-03 18:12:57,488 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:12:57,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2018-12-03 18:12:57,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2018-12-03 18:12:57,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7501, Invalid=25441, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:12:57,490 INFO L87 Difference]: Start difference. First operand 183 states and 184 transitions. Second operand 182 states. [2018-12-03 18:13:02,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:02,820 INFO L93 Difference]: Finished difference Result 307 states and 309 transitions. [2018-12-03 18:13:02,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2018-12-03 18:13:02,820 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 182 [2018-12-03 18:13:02,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:02,820 INFO L225 Difference]: With dead ends: 307 [2018-12-03 18:13:02,820 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 18:13:02,822 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 543 GetRequests, 184 SyntacticMatches, 119 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21122 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=13111, Invalid=45211, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 18:13:02,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 18:13:02,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 184. [2018-12-03 18:13:02,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-12-03 18:13:02,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 185 transitions. [2018-12-03 18:13:02,896 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 185 transitions. Word has length 182 [2018-12-03 18:13:02,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:02,896 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 185 transitions. [2018-12-03 18:13:02,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2018-12-03 18:13:02,896 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 185 transitions. [2018-12-03 18:13:02,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-12-03 18:13:02,897 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:02,897 INFO L402 BasicCegarLoop]: trace histogram [60, 60, 59, 1, 1, 1, 1] [2018-12-03 18:13:02,897 INFO L423 AbstractCegarLoop]: === Iteration 120 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:02,897 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:02,897 INFO L82 PathProgramCache]: Analyzing trace with hash -194394983, now seen corresponding path program 118 times [2018-12-03 18:13:02,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:02,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:02,898 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:02,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:02,898 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:03,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:04,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:04,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:04,524 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:04,524 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:04,524 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:04,524 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:04,524 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 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:04,533 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:04,533 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:13:04,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:04,677 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:04,762 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:04,762 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:07,577 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1830 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:07,597 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:07,598 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63, 63] total 65 [2018-12-03 18:13:07,598 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:07,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 18:13:07,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 18:13:07,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2021, Invalid=2269, Unknown=0, NotChecked=0, Total=4290 [2018-12-03 18:13:07,599 INFO L87 Difference]: Start difference. First operand 184 states and 185 transitions. Second operand 66 states. [2018-12-03 18:13:09,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:09,386 INFO L93 Difference]: Finished difference Result 192 states and 193 transitions. [2018-12-03 18:13:09,387 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2018-12-03 18:13:09,387 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 183 [2018-12-03 18:13:09,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:09,388 INFO L225 Difference]: With dead ends: 192 [2018-12-03 18:13:09,388 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 18:13:09,389 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 303 SyntacticMatches, 120 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7502 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=5987, Invalid=10015, Unknown=0, NotChecked=0, Total=16002 [2018-12-03 18:13:09,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 18:13:09,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 186. [2018-12-03 18:13:09,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-12-03 18:13:09,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 187 transitions. [2018-12-03 18:13:09,467 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 187 transitions. Word has length 183 [2018-12-03 18:13:09,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:09,467 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 187 transitions. [2018-12-03 18:13:09,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 18:13:09,467 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 187 transitions. [2018-12-03 18:13:09,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-12-03 18:13:09,467 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:09,468 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 60, 1, 1, 1, 1] [2018-12-03 18:13:09,468 INFO L423 AbstractCegarLoop]: === Iteration 121 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:09,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:09,468 INFO L82 PathProgramCache]: Analyzing trace with hash -2130051723, now seen corresponding path program 119 times [2018-12-03 18:13:09,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:09,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:09,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:09,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:09,469 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:09,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:14,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:14,233 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:14,233 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:14,233 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:14,234 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:14,234 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:14,234 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 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:14,242 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:13:14,242 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:13:14,574 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2018-12-03 18:13:14,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:14,582 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:20,202 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:20,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:24,706 INFO L134 CoverageAnalysis]: Checked inductivity of 5490 backedges. 3660 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:24,726 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:24,726 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 123, 123] total 184 [2018-12-03 18:13:24,726 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:24,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 185 states [2018-12-03 18:13:24,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 185 interpolants. [2018-12-03 18:13:24,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7748, Invalid=26292, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 18:13:24,728 INFO L87 Difference]: Start difference. First operand 186 states and 187 transitions. Second operand 185 states. [2018-12-03 18:13:31,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:31,261 INFO L93 Difference]: Finished difference Result 312 states and 314 transitions. [2018-12-03 18:13:31,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2018-12-03 18:13:31,261 INFO L78 Accepts]: Start accepts. Automaton has 185 states. Word has length 185 [2018-12-03 18:13:31,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:31,262 INFO L225 Difference]: With dead ends: 312 [2018-12-03 18:13:31,262 INFO L226 Difference]: Without dead ends: 187 [2018-12-03 18:13:31,264 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 187 SyntacticMatches, 121 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21840 ImplicationChecksByTransitivity, 17.8s TimeCoverageRelationStatistics Valid=13543, Invalid=46727, Unknown=0, NotChecked=0, Total=60270 [2018-12-03 18:13:31,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-12-03 18:13:31,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-12-03 18:13:31,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-12-03 18:13:31,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-12-03 18:13:31,332 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 185 [2018-12-03 18:13:31,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:31,333 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-12-03 18:13:31,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 185 states. [2018-12-03 18:13:31,333 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-12-03 18:13:31,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-12-03 18:13:31,333 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:31,333 INFO L402 BasicCegarLoop]: trace histogram [61, 61, 60, 1, 1, 1, 1] [2018-12-03 18:13:31,333 INFO L423 AbstractCegarLoop]: === Iteration 122 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:31,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:31,334 INFO L82 PathProgramCache]: Analyzing trace with hash 564879902, now seen corresponding path program 120 times [2018-12-03 18:13:31,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:31,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:31,334 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:31,334 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:31,335 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:31,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:32,934 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:32,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:32,935 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:32,935 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:32,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:32,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:32,935 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 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:32,944 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:13:32,944 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:13:33,102 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:13:33,102 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:13:33,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:33,227 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:33,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:35,920 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1891 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:35,940 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:35,940 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 64, 64] total 66 [2018-12-03 18:13:35,940 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:35,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-12-03 18:13:35,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-12-03 18:13:35,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2085, Invalid=2337, Unknown=0, NotChecked=0, Total=4422 [2018-12-03 18:13:35,941 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 67 states. [2018-12-03 18:13:37,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:13:37,874 INFO L93 Difference]: Finished difference Result 195 states and 196 transitions. [2018-12-03 18:13:37,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2018-12-03 18:13:37,875 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 186 [2018-12-03 18:13:37,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:13:37,876 INFO L225 Difference]: With dead ends: 195 [2018-12-03 18:13:37,876 INFO L226 Difference]: Without dead ends: 193 [2018-12-03 18:13:37,877 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 308 SyntacticMatches, 122 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7749 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=6178, Invalid=10334, Unknown=0, NotChecked=0, Total=16512 [2018-12-03 18:13:37,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-12-03 18:13:37,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 189. [2018-12-03 18:13:37,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-12-03 18:13:37,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-12-03 18:13:37,969 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 186 [2018-12-03 18:13:37,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:13:37,969 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-12-03 18:13:37,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-12-03 18:13:37,969 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-12-03 18:13:37,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-12-03 18:13:37,970 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:13:37,970 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 61, 1, 1, 1, 1] [2018-12-03 18:13:37,970 INFO L423 AbstractCegarLoop]: === Iteration 123 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:13:37,970 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:13:37,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1683639738, now seen corresponding path program 121 times [2018-12-03 18:13:37,970 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:13:37,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:37,971 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:13:37,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:13:37,971 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:13:38,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:42,695 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:42,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:42,696 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:13:42,696 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:13:42,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:13:42,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:13:42,696 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 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:13:42,704 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:13:42,704 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:13:42,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:13:42,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:13:48,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:48,743 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:13:53,353 INFO L134 CoverageAnalysis]: Checked inductivity of 5673 backedges. 3782 proven. 1891 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:13:53,372 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:13:53,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 125, 125] total 187 [2018-12-03 18:13:53,373 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:13:53,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2018-12-03 18:13:53,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2018-12-03 18:13:53,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7999, Invalid=27157, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 18:13:53,375 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 188 states. [2018-12-03 18:14:00,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:00,003 INFO L93 Difference]: Finished difference Result 317 states and 319 transitions. [2018-12-03 18:14:00,003 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2018-12-03 18:14:00,003 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 188 [2018-12-03 18:14:00,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:00,004 INFO L225 Difference]: With dead ends: 317 [2018-12-03 18:14:00,004 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 18:14:00,006 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 561 GetRequests, 190 SyntacticMatches, 123 SemanticMatches, 248 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22570 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=13982, Invalid=48268, Unknown=0, NotChecked=0, Total=62250 [2018-12-03 18:14:00,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 18:14:00,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2018-12-03 18:14:00,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-12-03 18:14:00,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-12-03 18:14:00,084 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 188 [2018-12-03 18:14:00,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:00,084 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-12-03 18:14:00,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2018-12-03 18:14:00,084 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-12-03 18:14:00,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-12-03 18:14:00,085 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:00,085 INFO L402 BasicCegarLoop]: trace histogram [62, 62, 61, 1, 1, 1, 1] [2018-12-03 18:14:00,085 INFO L423 AbstractCegarLoop]: === Iteration 124 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:00,085 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:00,085 INFO L82 PathProgramCache]: Analyzing trace with hash 568015985, now seen corresponding path program 122 times [2018-12-03 18:14:00,085 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:00,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:00,086 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:00,086 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:00,086 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:00,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:02,072 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:02,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:02,072 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:02,073 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:02,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:02,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:02,073 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 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:14:02,081 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:02,081 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:02,425 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2018-12-03 18:14:02,425 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:02,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:02,550 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:02,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:05,344 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 1953 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:05,364 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:05,365 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 65, 65] total 67 [2018-12-03 18:14:05,365 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:05,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 18:14:05,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 18:14:05,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2150, Invalid=2406, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 18:14:05,366 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 68 states. [2018-12-03 18:14:07,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:07,553 INFO L93 Difference]: Finished difference Result 198 states and 199 transitions. [2018-12-03 18:14:07,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2018-12-03 18:14:07,554 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 189 [2018-12-03 18:14:07,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:07,555 INFO L225 Difference]: With dead ends: 198 [2018-12-03 18:14:07,555 INFO L226 Difference]: Without dead ends: 196 [2018-12-03 18:14:07,556 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 566 GetRequests, 313 SyntacticMatches, 124 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8000 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=6372, Invalid=10658, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 18:14:07,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-12-03 18:14:07,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 192. [2018-12-03 18:14:07,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-03 18:14:07,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 193 transitions. [2018-12-03 18:14:07,639 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 193 transitions. Word has length 189 [2018-12-03 18:14:07,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:07,639 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 193 transitions. [2018-12-03 18:14:07,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 18:14:07,639 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 193 transitions. [2018-12-03 18:14:07,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-03 18:14:07,640 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:07,640 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 62, 1, 1, 1, 1] [2018-12-03 18:14:07,640 INFO L423 AbstractCegarLoop]: === Iteration 125 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:07,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:07,641 INFO L82 PathProgramCache]: Analyzing trace with hash 402448205, now seen corresponding path program 123 times [2018-12-03 18:14:07,641 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:07,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:07,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:07,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:07,641 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:07,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:12,695 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:12,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:12,695 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:12,695 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:12,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:12,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:12,696 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 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:14:12,703 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:14:12,704 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:14:12,864 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:14:12,865 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:12,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:18,987 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:18,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:23,791 INFO L134 CoverageAnalysis]: Checked inductivity of 5859 backedges. 3906 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:23,811 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:23,811 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 127, 127] total 190 [2018-12-03 18:14:23,811 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:23,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 191 states [2018-12-03 18:14:23,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2018-12-03 18:14:23,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8254, Invalid=28036, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 18:14:23,813 INFO L87 Difference]: Start difference. First operand 192 states and 193 transitions. Second operand 191 states. [2018-12-03 18:14:30,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:30,381 INFO L93 Difference]: Finished difference Result 322 states and 324 transitions. [2018-12-03 18:14:30,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2018-12-03 18:14:30,381 INFO L78 Accepts]: Start accepts. Automaton has 191 states. Word has length 191 [2018-12-03 18:14:30,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:30,382 INFO L225 Difference]: With dead ends: 322 [2018-12-03 18:14:30,382 INFO L226 Difference]: Without dead ends: 193 [2018-12-03 18:14:30,384 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 193 SyntacticMatches, 125 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23312 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=14428, Invalid=49834, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 18:14:30,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2018-12-03 18:14:30,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 193. [2018-12-03 18:14:30,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2018-12-03 18:14:30,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2018-12-03 18:14:30,459 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 191 [2018-12-03 18:14:30,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:30,459 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2018-12-03 18:14:30,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has 191 states. [2018-12-03 18:14:30,459 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2018-12-03 18:14:30,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2018-12-03 18:14:30,460 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:30,460 INFO L402 BasicCegarLoop]: trace histogram [63, 63, 62, 1, 1, 1, 1] [2018-12-03 18:14:30,461 INFO L423 AbstractCegarLoop]: === Iteration 126 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:30,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:30,461 INFO L82 PathProgramCache]: Analyzing trace with hash -687840970, now seen corresponding path program 124 times [2018-12-03 18:14:30,461 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:30,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:30,462 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:14:30,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:30,462 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:30,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:32,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:32,221 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:32,221 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:32,221 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:32,221 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:32,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:32,222 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 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:14:32,230 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:32,230 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:14:32,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:32,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:32,559 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:32,559 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:35,422 INFO L134 CoverageAnalysis]: Checked inductivity of 5922 backedges. 2016 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:35,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:35,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 68 [2018-12-03 18:14:35,441 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:35,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-12-03 18:14:35,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-12-03 18:14:35,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2216, Invalid=2476, Unknown=0, NotChecked=0, Total=4692 [2018-12-03 18:14:35,443 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand 69 states. [2018-12-03 18:14:37,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:14:37,396 INFO L93 Difference]: Finished difference Result 201 states and 202 transitions. [2018-12-03 18:14:37,396 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 131 states. [2018-12-03 18:14:37,396 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 192 [2018-12-03 18:14:37,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:14:37,397 INFO L225 Difference]: With dead ends: 201 [2018-12-03 18:14:37,397 INFO L226 Difference]: Without dead ends: 199 [2018-12-03 18:14:37,398 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 575 GetRequests, 318 SyntacticMatches, 126 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8255 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=6569, Invalid=10987, Unknown=0, NotChecked=0, Total=17556 [2018-12-03 18:14:37,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-12-03 18:14:37,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 195. [2018-12-03 18:14:37,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2018-12-03 18:14:37,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 196 transitions. [2018-12-03 18:14:37,484 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 196 transitions. Word has length 192 [2018-12-03 18:14:37,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:14:37,484 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 196 transitions. [2018-12-03 18:14:37,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-12-03 18:14:37,484 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 196 transitions. [2018-12-03 18:14:37,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-12-03 18:14:37,485 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:14:37,485 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 63, 1, 1, 1, 1] [2018-12-03 18:14:37,485 INFO L423 AbstractCegarLoop]: === Iteration 127 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:14:37,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:14:37,486 INFO L82 PathProgramCache]: Analyzing trace with hash 409724626, now seen corresponding path program 125 times [2018-12-03 18:14:37,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:14:37,486 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:37,486 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:14:37,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:14:37,487 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:14:37,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:14:42,531 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:42,531 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:42,531 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:14:42,532 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:14:42,532 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:14:42,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:14:42,532 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 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:14:42,543 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:14:42,543 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:14:42,918 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2018-12-03 18:14:42,918 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:14:42,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:14:49,257 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:49,257 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:14:54,341 INFO L134 CoverageAnalysis]: Checked inductivity of 6048 backedges. 4032 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:14:54,362 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:14:54,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 193 [2018-12-03 18:14:54,362 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:14:54,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2018-12-03 18:14:54,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2018-12-03 18:14:54,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8513, Invalid=28929, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:14:54,365 INFO L87 Difference]: Start difference. First operand 195 states and 196 transitions. Second operand 194 states. [2018-12-03 18:15:01,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:01,319 INFO L93 Difference]: Finished difference Result 327 states and 329 transitions. [2018-12-03 18:15:01,320 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2018-12-03 18:15:01,320 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 194 [2018-12-03 18:15:01,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:01,321 INFO L225 Difference]: With dead ends: 327 [2018-12-03 18:15:01,321 INFO L226 Difference]: Without dead ends: 196 [2018-12-03 18:15:01,323 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 196 SyntacticMatches, 127 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24066 ImplicationChecksByTransitivity, 19.4s TimeCoverageRelationStatistics Valid=14881, Invalid=51425, Unknown=0, NotChecked=0, Total=66306 [2018-12-03 18:15:01,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-12-03 18:15:01,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-12-03 18:15:01,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 18:15:01,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 197 transitions. [2018-12-03 18:15:01,435 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 197 transitions. Word has length 194 [2018-12-03 18:15:01,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:01,435 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 197 transitions. [2018-12-03 18:15:01,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2018-12-03 18:15:01,436 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 197 transitions. [2018-12-03 18:15:01,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 18:15:01,436 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:01,436 INFO L402 BasicCegarLoop]: trace histogram [64, 64, 63, 1, 1, 1, 1] [2018-12-03 18:15:01,437 INFO L423 AbstractCegarLoop]: === Iteration 128 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:01,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:01,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1852395447, now seen corresponding path program 126 times [2018-12-03 18:15:01,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:01,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:01,438 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:01,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:01,438 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:01,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:03,443 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2080 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:03,443 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:03,443 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:03,443 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:03,444 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:03,444 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:03,444 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 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:15:03,452 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:15:03,452 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:15:03,619 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:15:03,620 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:15:03,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:15:03,792 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2080 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:03,792 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:15:06,751 INFO L134 CoverageAnalysis]: Checked inductivity of 6112 backedges. 2016 proven. 4096 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:06,771 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:15:06,771 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 72 [2018-12-03 18:15:06,771 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:15:06,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-12-03 18:15:06,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-12-03 18:15:06,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2363, Invalid=2893, Unknown=0, NotChecked=0, Total=5256 [2018-12-03 18:15:06,773 INFO L87 Difference]: Start difference. First operand 196 states and 197 transitions. Second operand 71 states. [2018-12-03 18:15:09,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:15:09,256 INFO L93 Difference]: Finished difference Result 204 states and 205 transitions. [2018-12-03 18:15:09,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2018-12-03 18:15:09,257 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 195 [2018-12-03 18:15:09,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:15:09,257 INFO L225 Difference]: With dead ends: 204 [2018-12-03 18:15:09,258 INFO L226 Difference]: Without dead ends: 202 [2018-12-03 18:15:09,260 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 583 GetRequests, 321 SyntacticMatches, 127 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8779 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=6779, Invalid=11853, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:15:09,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2018-12-03 18:15:09,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 198. [2018-12-03 18:15:09,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-12-03 18:15:09,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 199 transitions. [2018-12-03 18:15:09,358 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 199 transitions. Word has length 195 [2018-12-03 18:15:09,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:15:09,358 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 199 transitions. [2018-12-03 18:15:09,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-12-03 18:15:09,358 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 199 transitions. [2018-12-03 18:15:09,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-12-03 18:15:09,359 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:15:09,359 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 64, 1, 1, 1, 1] [2018-12-03 18:15:09,359 INFO L423 AbstractCegarLoop]: === Iteration 129 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:15:09,359 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:15:09,359 INFO L82 PathProgramCache]: Analyzing trace with hash -2035630811, now seen corresponding path program 127 times [2018-12-03 18:15:09,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:15:09,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:09,360 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:15:09,360 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:15:09,360 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:15:09,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:14,540 INFO L134 CoverageAnalysis]: Checked inductivity of 6240 backedges. 4160 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:15:14,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:14,540 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:15:14,541 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:15:14,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:15:14,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:15:14,541 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 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-03 18:15:14,551 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:15:14,551 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:15:14,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:15:14,701 INFO L273 TraceCheckSpWp]: Computing forward predicates...