java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/ai/array-bench/reach_32bit_array_compound_oct_cong.epf -i ../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/MonadicInvariant01.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c78c21b [2018-12-03 18:16:10,929 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-03 18:16:10,934 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-03 18:16:10,953 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-03 18:16:10,954 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-03 18:16:10,955 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-03 18:16:10,959 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-03 18:16:10,961 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-03 18:16:10,964 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-03 18:16:10,966 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-03 18:16:10,967 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-12-03 18:16:11,013 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 18:16:11,038 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-03 18:16:11,038 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-03 18:16:11,039 INFO L131 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2018-12-03 18:16:11,039 INFO L133 SettingsManager]: * Show backtranslation warnings=false [2018-12-03 18:16:11,041 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-03 18:16:11,042 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-03 18:16:11,042 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-03 18:16:11,042 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-03 18:16:11,042 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-03 18:16:11,042 INFO L133 SettingsManager]: * Abstract domain=ArrayDomain [2018-12-03 18:16:11,043 INFO L133 SettingsManager]: * Log string format=TERM [2018-12-03 18:16:11,043 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-03 18:16:11,043 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-03 18:16:11,044 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-03 18:16:11,044 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-03 18:16:11,044 INFO L133 SettingsManager]: * Use SBE=true [2018-12-03 18:16:11,044 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-03 18:16:11,045 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-03 18:16:11,046 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-03 18:16:11,046 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-03 18:16:11,046 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-03 18:16:11,046 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-03 18:16:11,046 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-03 18:16:11,047 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-03 18:16:11,047 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-03 18:16:11,047 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-03 18:16:11,047 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-03 18:16:11,048 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-03 18:16:11,049 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-03 18:16:11,049 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-03 18:16:11,049 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-03 18:16:11,050 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-03 18:16:11,050 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-03 18:16:11,050 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-03 18:16:11,050 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-03 18:16:11,050 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-03 18:16:11,051 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-03 18:16:11,051 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-03 18:16:11,051 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-12-03 18:16:11,082 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-03 18:16:11,093 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-03 18:16:11,097 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-03 18:16:11,100 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-12-03 18:16:11,100 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-12-03 18:16:11,102 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/MonadicInvariant01.bpl [2018-12-03 18:16:11,102 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/MonadicInvariant01.bpl' [2018-12-03 18:16:11,131 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-03 18:16:11,133 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-12-03 18:16:11,134 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-03 18:16:11,134 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-03 18:16:11,134 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-03 18:16:11,153 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,162 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,168 WARN L165 Inliner]: Program contained no entry procedure! [2018-12-03 18:16:11,169 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-12-03 18:16:11,169 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-12-03 18:16:11,173 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-03 18:16:11,175 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-03 18:16:11,175 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-03 18:16:11,176 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-03 18:16:11,188 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,188 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,189 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,189 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,196 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,202 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,202 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/1) ... [2018-12-03 18:16:11,204 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-03 18:16:11,204 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-03 18:16:11,205 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-03 18:16:11,205 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-03 18:16:11,206 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (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 18:16:11,279 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2018-12-03 18:16:11,279 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-03 18:16:11,280 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-03 18:16:11,515 INFO L272 CfgBuilder]: Using library mode [2018-12-03 18:16:11,515 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-03 18:16:11,516 INFO L202 PluginConnector]: Adding new model MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:16:11 BoogieIcfgContainer [2018-12-03 18:16:11,516 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-03 18:16:11,517 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-03 18:16:11,517 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-03 18:16:11,521 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-03 18:16:11,521 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.12 06:16:11" (1/2) ... [2018-12-03 18:16:11,522 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77b043fe and model type MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 06:16:11, skipping insertion in model container [2018-12-03 18:16:11,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "MonadicInvariant01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 06:16:11" (2/2) ... [2018-12-03 18:16:11,526 INFO L112 eAbstractionObserver]: Analyzing ICFG MonadicInvariant01.bpl [2018-12-03 18:16:11,537 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-03 18:16:11,547 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-03 18:16:11,563 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-03 18:16:11,595 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-03 18:16:11,595 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-03 18:16:11,595 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-03 18:16:11,596 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-03 18:16:11,596 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-03 18:16:11,596 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-03 18:16:11,596 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-03 18:16:11,596 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-03 18:16:11,612 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-12-03 18:16:11,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-12-03 18:16:11,619 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:11,620 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-12-03 18:16:11,622 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:11,629 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:11,629 INFO L82 PathProgramCache]: Analyzing trace with hash 29920, now seen corresponding path program 1 times [2018-12-03 18:16:11,632 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:11,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:11,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:11,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:11,676 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:11,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:11,788 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 18:16:11,790 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-03 18:16:11,790 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2018-12-03 18:16:11,792 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-03 18:16:11,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-03 18:16:11,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-03 18:16:11,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:16:11,819 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-12-03 18:16:11,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:11,896 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-12-03 18:16:11,897 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-03 18:16:11,898 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-12-03 18:16:11,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:11,911 INFO L225 Difference]: With dead ends: 11 [2018-12-03 18:16:11,911 INFO L226 Difference]: Without dead ends: 6 [2018-12-03 18:16:11,918 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-03 18:16:11,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-12-03 18:16:11,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-12-03 18:16:11,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-12-03 18:16:11,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-12-03 18:16:11,966 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 3 [2018-12-03 18:16:11,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:11,967 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-12-03 18:16:11,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-03 18:16:11,967 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-12-03 18:16:11,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-12-03 18:16:11,968 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:11,968 INFO L402 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2018-12-03 18:16:11,968 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:11,969 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:11,969 INFO L82 PathProgramCache]: Analyzing trace with hash 28754210, now seen corresponding path program 1 times [2018-12-03 18:16:11,969 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:11,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:11,971 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:11,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:11,972 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:11,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:12,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:12,092 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:12,092 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:12,093 INFO L203 CegarAbsIntRunner]: Running AI on error trace of length 6 with the following transitions: [2018-12-03 18:16:12,095 INFO L205 CegarAbsIntRunner]: [0], [4], [5], [6] [2018-12-03 18:16:12,154 INFO L148 AbstractInterpreter]: Using domain ArrayDomain [2018-12-03 18:16:12,154 INFO L101 FixpointEngine]: Starting fixpoint engine with domain ArrayDomain (maxUnwinding=3, maxParallelStates=2) [2018-12-03 18:16:12,467 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-12-03 18:16:12,469 INFO L272 AbstractInterpreter]: Visited 4 different actions 37 times. Merged at 2 different actions 22 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 0 variables. [2018-12-03 18:16:12,484 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:12,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-12-03 18:16:12,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:12,486 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 18:16:12,499 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:12,499 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:12,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:12,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:12,814 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:12,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:12,866 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:12,886 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:12,887 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2018-12-03 18:16:12,887 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:12,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-03 18:16:12,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-03 18:16:12,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2018-12-03 18:16:12,888 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 6 states. [2018-12-03 18:16:12,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:12,933 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-12-03 18:16:12,934 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-12-03 18:16:12,934 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 5 [2018-12-03 18:16:12,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:12,935 INFO L225 Difference]: With dead ends: 9 [2018-12-03 18:16:12,935 INFO L226 Difference]: Without dead ends: 8 [2018-12-03 18:16:12,937 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2018-12-03 18:16:12,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-12-03 18:16:12,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-12-03 18:16:12,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-12-03 18:16:12,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-12-03 18:16:12,940 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 5 [2018-12-03 18:16:12,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:12,941 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-12-03 18:16:12,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-03 18:16:12,941 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-12-03 18:16:12,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-12-03 18:16:12,942 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:12,942 INFO L402 BasicCegarLoop]: trace histogram [3, 2, 1, 1] [2018-12-03 18:16:12,944 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:12,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:12,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1862993124, now seen corresponding path program 2 times [2018-12-03 18:16:12,945 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:12,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:12,946 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:12,946 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:12,948 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:12,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:13,025 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:13,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:13,026 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:13,026 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:13,026 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:13,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:13,027 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 18:16:13,050 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:13,050 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:13,074 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-12-03 18:16:13,074 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:13,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:13,230 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:13,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:13,494 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:13,520 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:13,521 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2018-12-03 18:16:13,521 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:13,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-03 18:16:13,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-03 18:16:13,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:16:13,523 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 8 states. [2018-12-03 18:16:13,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:13,579 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-12-03 18:16:13,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-03 18:16:13,580 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 7 [2018-12-03 18:16:13,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:13,581 INFO L225 Difference]: With dead ends: 11 [2018-12-03 18:16:13,581 INFO L226 Difference]: Without dead ends: 10 [2018-12-03 18:16:13,582 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=52, Invalid=58, Unknown=0, NotChecked=0, Total=110 [2018-12-03 18:16:13,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-12-03 18:16:13,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-12-03 18:16:13,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-12-03 18:16:13,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-12-03 18:16:13,586 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2018-12-03 18:16:13,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:13,586 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-12-03 18:16:13,586 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-03 18:16:13,587 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-12-03 18:16:13,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-03 18:16:13,587 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:13,587 INFO L402 BasicCegarLoop]: trace histogram [4, 3, 1, 1] [2018-12-03 18:16:13,588 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:13,588 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:13,588 INFO L82 PathProgramCache]: Analyzing trace with hash -664969178, now seen corresponding path program 3 times [2018-12-03 18:16:13,588 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:13,589 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:13,590 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:13,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:13,590 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:13,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:13,674 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:13,674 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:13,674 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:13,674 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:13,675 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:13,675 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:13,675 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 18:16:13,686 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:13,686 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:13,697 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:13,697 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:13,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:13,865 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:13,865 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:13,942 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:13,962 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:13,962 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2018-12-03 18:16:13,962 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:13,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-12-03 18:16:13,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-12-03 18:16:13,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:16:13,964 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 10 states. [2018-12-03 18:16:14,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:14,012 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-12-03 18:16:14,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-03 18:16:14,012 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 9 [2018-12-03 18:16:14,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:14,013 INFO L225 Difference]: With dead ends: 13 [2018-12-03 18:16:14,014 INFO L226 Difference]: Without dead ends: 12 [2018-12-03 18:16:14,015 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=97, Unknown=0, NotChecked=0, Total=182 [2018-12-03 18:16:14,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-12-03 18:16:14,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-12-03 18:16:14,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-12-03 18:16:14,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-12-03 18:16:14,019 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2018-12-03 18:16:14,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:14,020 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-12-03 18:16:14,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-12-03 18:16:14,020 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-12-03 18:16:14,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-12-03 18:16:14,020 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:14,021 INFO L402 BasicCegarLoop]: trace histogram [5, 4, 1, 1] [2018-12-03 18:16:14,021 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:14,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:14,021 INFO L82 PathProgramCache]: Analyzing trace with hash 914748136, now seen corresponding path program 4 times [2018-12-03 18:16:14,021 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:14,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:14,023 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:14,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:14,023 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:14,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:14,164 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:14,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:14,165 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:14,166 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:14,166 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:14,166 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:14,166 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 18:16:14,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:14,176 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:14,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:14,184 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:14,364 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:14,365 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:14,798 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:14,819 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:14,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 15 [2018-12-03 18:16:14,819 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:14,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-12-03 18:16:14,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-12-03 18:16:14,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:16:14,821 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 12 states. [2018-12-03 18:16:14,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:14,886 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-12-03 18:16:14,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-12-03 18:16:14,888 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 11 [2018-12-03 18:16:14,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:14,890 INFO L225 Difference]: With dead ends: 15 [2018-12-03 18:16:14,891 INFO L226 Difference]: Without dead ends: 14 [2018-12-03 18:16:14,892 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=126, Invalid=146, Unknown=0, NotChecked=0, Total=272 [2018-12-03 18:16:14,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-12-03 18:16:14,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-12-03 18:16:14,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-12-03 18:16:14,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-12-03 18:16:14,896 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-12-03 18:16:14,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:14,897 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-12-03 18:16:14,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-12-03 18:16:14,897 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-12-03 18:16:14,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-03 18:16:14,897 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:14,897 INFO L402 BasicCegarLoop]: trace histogram [6, 5, 1, 1] [2018-12-03 18:16:14,898 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:14,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:14,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1395335894, now seen corresponding path program 5 times [2018-12-03 18:16:14,898 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:14,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:14,900 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:14,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:14,900 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:14,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:15,012 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:15,013 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:15,013 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:15,014 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:15,014 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:15,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:15,014 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 18:16:15,023 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:15,023 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:15,031 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-12-03 18:16:15,031 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:15,033 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:15,160 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:15,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:15,291 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:15,311 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:15,311 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2018-12-03 18:16:15,311 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:15,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-12-03 18:16:15,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-12-03 18:16:15,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:16:15,313 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 14 states. [2018-12-03 18:16:15,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:15,384 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-12-03 18:16:15,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-03 18:16:15,385 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 13 [2018-12-03 18:16:15,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:15,386 INFO L225 Difference]: With dead ends: 17 [2018-12-03 18:16:15,386 INFO L226 Difference]: Without dead ends: 16 [2018-12-03 18:16:15,387 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=175, Invalid=205, Unknown=0, NotChecked=0, Total=380 [2018-12-03 18:16:15,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-12-03 18:16:15,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-12-03 18:16:15,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-12-03 18:16:15,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-12-03 18:16:15,391 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-12-03 18:16:15,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:15,392 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-12-03 18:16:15,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-12-03 18:16:15,392 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-12-03 18:16:15,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-12-03 18:16:15,393 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:15,393 INFO L402 BasicCegarLoop]: trace histogram [7, 6, 1, 1] [2018-12-03 18:16:15,393 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:15,394 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:15,394 INFO L82 PathProgramCache]: Analyzing trace with hash -887996692, now seen corresponding path program 6 times [2018-12-03 18:16:15,394 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:15,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:15,395 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:15,395 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:15,395 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:15,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:15,531 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:15,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:15,532 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:15,532 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:15,532 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:15,532 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:15,533 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 18:16:15,548 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:15,548 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:15,575 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:15,575 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:15,577 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:15,683 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:15,683 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:15,841 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:15,862 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:15,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2018-12-03 18:16:15,862 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:15,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-12-03 18:16:15,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-12-03 18:16:15,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:16:15,864 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 16 states. [2018-12-03 18:16:15,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:15,920 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-12-03 18:16:15,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-12-03 18:16:15,921 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 15 [2018-12-03 18:16:15,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:15,922 INFO L225 Difference]: With dead ends: 19 [2018-12-03 18:16:15,922 INFO L226 Difference]: Without dead ends: 18 [2018-12-03 18:16:15,925 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=232, Invalid=274, Unknown=0, NotChecked=0, Total=506 [2018-12-03 18:16:15,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-12-03 18:16:15,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-12-03 18:16:15,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-12-03 18:16:15,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-12-03 18:16:15,930 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-12-03 18:16:15,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:15,930 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-12-03 18:16:15,930 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-12-03 18:16:15,930 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-12-03 18:16:15,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-12-03 18:16:15,931 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:15,931 INFO L402 BasicCegarLoop]: trace histogram [8, 7, 1, 1] [2018-12-03 18:16:15,931 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:15,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:15,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1333671982, now seen corresponding path program 7 times [2018-12-03 18:16:15,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:15,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:15,933 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:15,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:15,933 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:15,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:16,097 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:16,098 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:16,098 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:16,098 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:16,099 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:16,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:16,099 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 18:16:16,108 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:16,109 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:16,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:16,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:16,282 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:16,282 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:16,595 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:16,614 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:16,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2018-12-03 18:16:16,615 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:16,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-12-03 18:16:16,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-12-03 18:16:16,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:16:16,617 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 18 states. [2018-12-03 18:16:16,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:16,676 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-12-03 18:16:16,682 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-12-03 18:16:16,682 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 17 [2018-12-03 18:16:16,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:16,684 INFO L225 Difference]: With dead ends: 21 [2018-12-03 18:16:16,684 INFO L226 Difference]: Without dead ends: 20 [2018-12-03 18:16:16,685 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=297, Invalid=353, Unknown=0, NotChecked=0, Total=650 [2018-12-03 18:16:16,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-12-03 18:16:16,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-12-03 18:16:16,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-12-03 18:16:16,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-12-03 18:16:16,688 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-12-03 18:16:16,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:16,689 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-12-03 18:16:16,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-12-03 18:16:16,689 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-12-03 18:16:16,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-12-03 18:16:16,689 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:16,689 INFO L402 BasicCegarLoop]: trace histogram [9, 8, 1, 1] [2018-12-03 18:16:16,690 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:16,690 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:16,690 INFO L82 PathProgramCache]: Analyzing trace with hash 1758521584, now seen corresponding path program 8 times [2018-12-03 18:16:16,690 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:16,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:16,691 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:16,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:16,691 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:16,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:16,803 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:16,804 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:16,804 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:16,804 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:16,804 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:16,804 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:16,805 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 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 18:16:16,815 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:16,816 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:16,891 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-12-03 18:16:16,891 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:16,893 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:17,026 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:17,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:17,162 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:17,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:17,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 27 [2018-12-03 18:16:17,183 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:17,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-12-03 18:16:17,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-12-03 18:16:17,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:16:17,185 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 20 states. [2018-12-03 18:16:17,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:17,228 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-12-03 18:16:17,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-12-03 18:16:17,230 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 19 [2018-12-03 18:16:17,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:17,231 INFO L225 Difference]: With dead ends: 23 [2018-12-03 18:16:17,231 INFO L226 Difference]: Without dead ends: 22 [2018-12-03 18:16:17,233 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=370, Invalid=442, Unknown=0, NotChecked=0, Total=812 [2018-12-03 18:16:17,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-12-03 18:16:17,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-12-03 18:16:17,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-12-03 18:16:17,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-12-03 18:16:17,237 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-12-03 18:16:17,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:17,237 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-12-03 18:16:17,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-12-03 18:16:17,237 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-12-03 18:16:17,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-12-03 18:16:17,238 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:17,238 INFO L402 BasicCegarLoop]: trace histogram [10, 9, 1, 1] [2018-12-03 18:16:17,238 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:17,238 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:17,239 INFO L82 PathProgramCache]: Analyzing trace with hash 2017095986, now seen corresponding path program 9 times [2018-12-03 18:16:17,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:17,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:17,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:17,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:17,240 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:17,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:17,373 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:17,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:17,373 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:17,373 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:17,373 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:17,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:17,374 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 18:16:17,389 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:17,389 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:17,402 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:17,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:17,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:17,668 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:17,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:17,983 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:18,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:18,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 30 [2018-12-03 18:16:18,002 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:18,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-12-03 18:16:18,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-12-03 18:16:18,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:16:18,004 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 22 states. [2018-12-03 18:16:18,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:18,251 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-12-03 18:16:18,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-12-03 18:16:18,252 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 21 [2018-12-03 18:16:18,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:18,253 INFO L225 Difference]: With dead ends: 25 [2018-12-03 18:16:18,253 INFO L226 Difference]: Without dead ends: 24 [2018-12-03 18:16:18,257 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=451, Invalid=541, Unknown=0, NotChecked=0, Total=992 [2018-12-03 18:16:18,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-12-03 18:16:18,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-12-03 18:16:18,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-12-03 18:16:18,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-12-03 18:16:18,265 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-12-03 18:16:18,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:18,265 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-12-03 18:16:18,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-12-03 18:16:18,266 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-12-03 18:16:18,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-03 18:16:18,267 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:18,267 INFO L402 BasicCegarLoop]: trace histogram [11, 10, 1, 1] [2018-12-03 18:16:18,268 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:18,268 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:18,268 INFO L82 PathProgramCache]: Analyzing trace with hash 1398993140, now seen corresponding path program 10 times [2018-12-03 18:16:18,268 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:18,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:18,269 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:18,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:18,272 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:18,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:18,463 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:18,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:18,464 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:18,464 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:18,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:18,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:18,465 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 18:16:18,475 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:18,475 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:18,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:18,484 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:18,697 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:18,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:19,016 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:19,035 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:19,036 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 33 [2018-12-03 18:16:19,036 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:19,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-12-03 18:16:19,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-12-03 18:16:19,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:16:19,038 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 24 states. [2018-12-03 18:16:19,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:19,138 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-12-03 18:16:19,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-12-03 18:16:19,139 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 23 [2018-12-03 18:16:19,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:19,140 INFO L225 Difference]: With dead ends: 27 [2018-12-03 18:16:19,140 INFO L226 Difference]: Without dead ends: 26 [2018-12-03 18:16:19,141 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=540, Invalid=650, Unknown=0, NotChecked=0, Total=1190 [2018-12-03 18:16:19,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-03 18:16:19,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-12-03 18:16:19,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-12-03 18:16:19,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-12-03 18:16:19,146 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-12-03 18:16:19,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:19,147 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-12-03 18:16:19,147 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-12-03 18:16:19,147 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-12-03 18:16:19,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-12-03 18:16:19,147 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:19,147 INFO L402 BasicCegarLoop]: trace histogram [12, 11, 1, 1] [2018-12-03 18:16:19,148 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:19,148 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:19,148 INFO L82 PathProgramCache]: Analyzing trace with hash 107644982, now seen corresponding path program 11 times [2018-12-03 18:16:19,148 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:19,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:19,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:19,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:19,149 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:19,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:19,271 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:19,271 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:19,271 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:19,272 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:19,272 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:19,272 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:19,272 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 18:16:19,282 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:19,282 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:19,306 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-12-03 18:16:19,306 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:19,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:19,971 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:19,971 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:20,364 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:20,383 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:20,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 36 [2018-12-03 18:16:20,384 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:20,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-12-03 18:16:20,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-12-03 18:16:20,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:16:20,386 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 26 states. [2018-12-03 18:16:20,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:20,460 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-12-03 18:16:20,460 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-12-03 18:16:20,460 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 25 [2018-12-03 18:16:20,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:20,461 INFO L225 Difference]: With dead ends: 29 [2018-12-03 18:16:20,461 INFO L226 Difference]: Without dead ends: 28 [2018-12-03 18:16:20,462 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 552 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=637, Invalid=769, Unknown=0, NotChecked=0, Total=1406 [2018-12-03 18:16:20,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-03 18:16:20,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-12-03 18:16:20,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-03 18:16:20,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-12-03 18:16:20,467 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-12-03 18:16:20,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:20,467 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-12-03 18:16:20,467 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-12-03 18:16:20,467 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-12-03 18:16:20,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-03 18:16:20,468 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:20,468 INFO L402 BasicCegarLoop]: trace histogram [13, 12, 1, 1] [2018-12-03 18:16:20,469 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:20,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:20,469 INFO L82 PathProgramCache]: Analyzing trace with hash 367613688, now seen corresponding path program 12 times [2018-12-03 18:16:20,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:20,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:20,470 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:20,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:20,471 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:20,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:20,733 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:20,733 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:20,733 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:20,733 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:20,733 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:20,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:20,734 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 18:16:20,743 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:20,743 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:20,762 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:20,763 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:20,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:20,956 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:20,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:21,320 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:21,339 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:21,339 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 39 [2018-12-03 18:16:21,340 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:21,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-12-03 18:16:21,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-12-03 18:16:21,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:16:21,341 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 28 states. [2018-12-03 18:16:21,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:21,420 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-12-03 18:16:21,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-12-03 18:16:21,421 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 27 [2018-12-03 18:16:21,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:21,422 INFO L225 Difference]: With dead ends: 31 [2018-12-03 18:16:21,422 INFO L226 Difference]: Without dead ends: 30 [2018-12-03 18:16:21,424 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=742, Invalid=898, Unknown=0, NotChecked=0, Total=1640 [2018-12-03 18:16:21,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-03 18:16:21,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-12-03 18:16:21,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-03 18:16:21,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-12-03 18:16:21,428 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-12-03 18:16:21,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:21,428 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-12-03 18:16:21,428 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-12-03 18:16:21,428 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-12-03 18:16:21,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-12-03 18:16:21,429 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:21,429 INFO L402 BasicCegarLoop]: trace histogram [14, 13, 1, 1] [2018-12-03 18:16:21,429 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:21,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:21,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1089436986, now seen corresponding path program 13 times [2018-12-03 18:16:21,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:21,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:21,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:21,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:21,431 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:21,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:21,626 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:21,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:21,626 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:21,627 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:21,627 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:21,627 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:21,627 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 18:16:21,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:21,639 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:21,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:21,663 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:21,930 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:21,930 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:23,075 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:23,095 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:23,095 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 42 [2018-12-03 18:16:23,095 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:23,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-12-03 18:16:23,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-12-03 18:16:23,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:16:23,097 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 30 states. [2018-12-03 18:16:23,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:23,166 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-12-03 18:16:23,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-12-03 18:16:23,166 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 29 [2018-12-03 18:16:23,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:23,167 INFO L225 Difference]: With dead ends: 33 [2018-12-03 18:16:23,167 INFO L226 Difference]: Without dead ends: 32 [2018-12-03 18:16:23,169 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 756 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=855, Invalid=1037, Unknown=0, NotChecked=0, Total=1892 [2018-12-03 18:16:23,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-12-03 18:16:23,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-12-03 18:16:23,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-12-03 18:16:23,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-12-03 18:16:23,173 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-12-03 18:16:23,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:23,174 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-12-03 18:16:23,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-12-03 18:16:23,174 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-12-03 18:16:23,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-12-03 18:16:23,175 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:23,175 INFO L402 BasicCegarLoop]: trace histogram [15, 14, 1, 1] [2018-12-03 18:16:23,175 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:23,175 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:23,175 INFO L82 PathProgramCache]: Analyzing trace with hash -1023075588, now seen corresponding path program 14 times [2018-12-03 18:16:23,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:23,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:23,176 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:23,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:23,177 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:23,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:23,395 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:23,396 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:23,396 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:23,396 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:23,397 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:23,397 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:23,397 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 18:16:23,413 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:23,414 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:23,446 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-12-03 18:16:23,446 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:23,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:24,065 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:24,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:24,489 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:24,509 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:24,509 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2018-12-03 18:16:24,509 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:24,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-12-03 18:16:24,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-12-03 18:16:24,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:16:24,511 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 32 states. [2018-12-03 18:16:24,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:24,630 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-12-03 18:16:24,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-12-03 18:16:24,631 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 31 [2018-12-03 18:16:24,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:24,632 INFO L225 Difference]: With dead ends: 35 [2018-12-03 18:16:24,632 INFO L226 Difference]: Without dead ends: 34 [2018-12-03 18:16:24,634 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=976, Invalid=1186, Unknown=0, NotChecked=0, Total=2162 [2018-12-03 18:16:24,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-12-03 18:16:24,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-12-03 18:16:24,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-03 18:16:24,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-12-03 18:16:24,638 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-12-03 18:16:24,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:24,638 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-12-03 18:16:24,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-12-03 18:16:24,638 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-12-03 18:16:24,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-12-03 18:16:24,639 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:24,639 INFO L402 BasicCegarLoop]: trace histogram [16, 15, 1, 1] [2018-12-03 18:16:24,639 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:24,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:24,640 INFO L82 PathProgramCache]: Analyzing trace with hash 371871806, now seen corresponding path program 15 times [2018-12-03 18:16:24,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:24,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:24,641 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:24,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:24,641 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:24,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:24,846 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:24,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:24,847 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:24,847 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:24,847 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:24,847 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:24,848 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 18:16:24,861 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:24,861 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:24,893 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:24,894 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:24,896 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:25,367 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:25,368 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:25,686 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:25,708 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:25,708 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2018-12-03 18:16:25,708 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:25,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-12-03 18:16:25,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-12-03 18:16:25,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:16:25,710 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 34 states. [2018-12-03 18:16:25,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:25,895 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-12-03 18:16:25,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-12-03 18:16:25,895 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 33 [2018-12-03 18:16:25,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:25,896 INFO L225 Difference]: With dead ends: 37 [2018-12-03 18:16:25,896 INFO L226 Difference]: Without dead ends: 36 [2018-12-03 18:16:25,898 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1105, Invalid=1345, Unknown=0, NotChecked=0, Total=2450 [2018-12-03 18:16:25,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-03 18:16:25,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-12-03 18:16:25,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-12-03 18:16:25,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-12-03 18:16:25,902 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-12-03 18:16:25,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:25,903 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-12-03 18:16:25,903 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-12-03 18:16:25,903 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-12-03 18:16:25,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-12-03 18:16:25,904 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:25,904 INFO L402 BasicCegarLoop]: trace histogram [17, 16, 1, 1] [2018-12-03 18:16:25,904 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:25,904 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:25,905 INFO L82 PathProgramCache]: Analyzing trace with hash 886521088, now seen corresponding path program 16 times [2018-12-03 18:16:25,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:25,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:25,906 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:25,906 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:25,906 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:25,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:26,305 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:26,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:26,305 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:26,305 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:26,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:26,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:26,306 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 18:16:26,315 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:26,315 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:26,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:26,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:26,588 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:26,589 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:27,002 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:27,021 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:27,021 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 51 [2018-12-03 18:16:27,021 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:27,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-12-03 18:16:27,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-12-03 18:16:27,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:16:27,023 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 36 states. [2018-12-03 18:16:27,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:27,099 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-12-03 18:16:27,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-12-03 18:16:27,099 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 35 [2018-12-03 18:16:27,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:27,100 INFO L225 Difference]: With dead ends: 39 [2018-12-03 18:16:27,100 INFO L226 Difference]: Without dead ends: 38 [2018-12-03 18:16:27,102 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1122 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1242, Invalid=1514, Unknown=0, NotChecked=0, Total=2756 [2018-12-03 18:16:27,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-12-03 18:16:27,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-12-03 18:16:27,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-12-03 18:16:27,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-12-03 18:16:27,106 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-12-03 18:16:27,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:27,106 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-12-03 18:16:27,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-12-03 18:16:27,107 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-12-03 18:16:27,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-12-03 18:16:27,107 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:27,108 INFO L402 BasicCegarLoop]: trace histogram [18, 17, 1, 1] [2018-12-03 18:16:27,108 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:27,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:27,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1543242050, now seen corresponding path program 17 times [2018-12-03 18:16:27,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:27,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:27,109 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:27,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:27,109 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:27,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:27,525 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:27,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:27,526 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:27,526 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:27,526 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:27,526 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:27,526 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 18:16:27,536 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:27,536 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:27,550 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-12-03 18:16:27,550 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:27,552 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:27,837 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:27,838 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:28,441 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:28,460 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:28,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 54 [2018-12-03 18:16:28,460 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:28,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-12-03 18:16:28,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-12-03 18:16:28,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:16:28,462 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 38 states. [2018-12-03 18:16:28,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:28,703 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-12-03 18:16:28,704 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-12-03 18:16:28,704 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 37 [2018-12-03 18:16:28,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:28,705 INFO L225 Difference]: With dead ends: 41 [2018-12-03 18:16:28,705 INFO L226 Difference]: Without dead ends: 40 [2018-12-03 18:16:28,707 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1260 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1387, Invalid=1693, Unknown=0, NotChecked=0, Total=3080 [2018-12-03 18:16:28,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-12-03 18:16:28,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-12-03 18:16:28,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-12-03 18:16:28,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-12-03 18:16:28,714 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-12-03 18:16:28,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:28,715 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-12-03 18:16:28,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-12-03 18:16:28,715 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-12-03 18:16:28,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-12-03 18:16:28,717 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:28,718 INFO L402 BasicCegarLoop]: trace histogram [19, 18, 1, 1] [2018-12-03 18:16:28,718 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:28,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:28,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1291894020, now seen corresponding path program 18 times [2018-12-03 18:16:28,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:28,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:28,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:28,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:28,720 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:28,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:29,050 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:29,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:29,051 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:29,051 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:29,051 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:29,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:29,051 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 18:16:29,061 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:29,061 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:29,071 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:29,072 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:29,074 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:29,342 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:29,343 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:29,983 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:30,002 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:30,002 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 57 [2018-12-03 18:16:30,002 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:30,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-12-03 18:16:30,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-12-03 18:16:30,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:16:30,005 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 40 states. [2018-12-03 18:16:30,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:30,199 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-12-03 18:16:30,200 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-12-03 18:16:30,200 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 39 [2018-12-03 18:16:30,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:30,200 INFO L225 Difference]: With dead ends: 43 [2018-12-03 18:16:30,200 INFO L226 Difference]: Without dead ends: 42 [2018-12-03 18:16:30,202 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1540, Invalid=1882, Unknown=0, NotChecked=0, Total=3422 [2018-12-03 18:16:30,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-12-03 18:16:30,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-12-03 18:16:30,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-12-03 18:16:30,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-12-03 18:16:30,206 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-12-03 18:16:30,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:30,207 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-12-03 18:16:30,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-12-03 18:16:30,207 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-12-03 18:16:30,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-12-03 18:16:30,208 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:30,208 INFO L402 BasicCegarLoop]: trace histogram [20, 19, 1, 1] [2018-12-03 18:16:30,208 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:30,208 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:30,209 INFO L82 PathProgramCache]: Analyzing trace with hash 264605766, now seen corresponding path program 19 times [2018-12-03 18:16:30,209 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:30,209 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:30,210 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:30,210 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:30,210 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:30,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:30,587 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:30,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:30,587 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:30,588 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:30,588 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:30,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:30,588 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 18:16:30,597 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:30,597 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:30,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:30,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:30,921 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:30,922 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:31,411 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:31,431 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:31,431 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 60 [2018-12-03 18:16:31,431 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:31,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-12-03 18:16:31,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-12-03 18:16:31,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:16:31,433 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 42 states. [2018-12-03 18:16:31,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:31,516 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-12-03 18:16:31,517 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-12-03 18:16:31,517 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 41 [2018-12-03 18:16:31,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:31,518 INFO L225 Difference]: With dead ends: 45 [2018-12-03 18:16:31,518 INFO L226 Difference]: Without dead ends: 44 [2018-12-03 18:16:31,520 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1560 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1701, Invalid=2081, Unknown=0, NotChecked=0, Total=3782 [2018-12-03 18:16:31,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-12-03 18:16:31,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-12-03 18:16:31,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-12-03 18:16:31,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-12-03 18:16:31,525 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-12-03 18:16:31,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:31,525 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-12-03 18:16:31,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-12-03 18:16:31,526 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-12-03 18:16:31,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-12-03 18:16:31,526 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:31,526 INFO L402 BasicCegarLoop]: trace histogram [21, 20, 1, 1] [2018-12-03 18:16:31,527 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:31,527 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:31,527 INFO L82 PathProgramCache]: Analyzing trace with hash 883071752, now seen corresponding path program 20 times [2018-12-03 18:16:31,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:31,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:31,528 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:31,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:31,529 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:31,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:31,798 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:31,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:31,798 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:31,798 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:31,798 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:31,798 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:31,798 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 18:16:31,808 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:31,808 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:31,830 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-12-03 18:16:31,830 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:31,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:32,155 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:32,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:32,702 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:32,723 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:32,723 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 63 [2018-12-03 18:16:32,723 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:32,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-12-03 18:16:32,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-12-03 18:16:32,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:16:32,725 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 44 states. [2018-12-03 18:16:32,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:32,813 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-12-03 18:16:32,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-12-03 18:16:32,814 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 43 [2018-12-03 18:16:32,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:32,815 INFO L225 Difference]: With dead ends: 47 [2018-12-03 18:16:32,815 INFO L226 Difference]: Without dead ends: 46 [2018-12-03 18:16:32,817 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1722 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1870, Invalid=2290, Unknown=0, NotChecked=0, Total=4160 [2018-12-03 18:16:32,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-12-03 18:16:32,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-12-03 18:16:32,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-12-03 18:16:32,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-12-03 18:16:32,822 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-12-03 18:16:32,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:32,822 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-12-03 18:16:32,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-12-03 18:16:32,822 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-12-03 18:16:32,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-12-03 18:16:32,823 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:32,823 INFO L402 BasicCegarLoop]: trace histogram [22, 21, 1, 1] [2018-12-03 18:16:32,823 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:32,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:32,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1771569846, now seen corresponding path program 21 times [2018-12-03 18:16:32,824 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:32,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:32,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:32,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:32,825 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:32,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:33,743 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:33,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:33,744 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:33,744 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:33,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:33,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:33,744 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 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 18:16:33,753 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:33,754 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:33,768 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:33,768 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:33,770 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:34,128 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:34,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:35,006 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:35,025 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:35,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 66 [2018-12-03 18:16:35,025 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:35,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-12-03 18:16:35,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-12-03 18:16:35,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 18:16:35,027 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 46 states. [2018-12-03 18:16:35,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:35,129 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-12-03 18:16:35,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-12-03 18:16:35,133 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 45 [2018-12-03 18:16:35,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:35,133 INFO L225 Difference]: With dead ends: 49 [2018-12-03 18:16:35,133 INFO L226 Difference]: Without dead ends: 48 [2018-12-03 18:16:35,134 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2047, Invalid=2509, Unknown=0, NotChecked=0, Total=4556 [2018-12-03 18:16:35,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-12-03 18:16:35,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-12-03 18:16:35,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-12-03 18:16:35,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-12-03 18:16:35,138 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-12-03 18:16:35,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:35,138 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-12-03 18:16:35,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-12-03 18:16:35,139 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-12-03 18:16:35,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-12-03 18:16:35,139 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:35,139 INFO L402 BasicCegarLoop]: trace histogram [23, 22, 1, 1] [2018-12-03 18:16:35,140 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:35,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:35,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1671571700, now seen corresponding path program 22 times [2018-12-03 18:16:35,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:35,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:35,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:35,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:35,141 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:35,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:35,683 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:35,683 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:35,683 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:35,683 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:35,684 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:35,684 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:35,684 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 18:16:35,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:35,692 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:35,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:35,706 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:36,555 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:36,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:37,196 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:37,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:37,215 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 69 [2018-12-03 18:16:37,215 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:37,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-12-03 18:16:37,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-12-03 18:16:37,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:16:37,217 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 48 states. [2018-12-03 18:16:37,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:37,340 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-12-03 18:16:37,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-12-03 18:16:37,340 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 47 [2018-12-03 18:16:37,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:37,341 INFO L225 Difference]: With dead ends: 51 [2018-12-03 18:16:37,341 INFO L226 Difference]: Without dead ends: 50 [2018-12-03 18:16:37,343 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2070 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2232, Invalid=2738, Unknown=0, NotChecked=0, Total=4970 [2018-12-03 18:16:37,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-12-03 18:16:37,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-12-03 18:16:37,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-12-03 18:16:37,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-12-03 18:16:37,347 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-12-03 18:16:37,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:37,348 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-12-03 18:16:37,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-12-03 18:16:37,348 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-12-03 18:16:37,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-12-03 18:16:37,349 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:37,349 INFO L402 BasicCegarLoop]: trace histogram [24, 23, 1, 1] [2018-12-03 18:16:37,349 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:37,349 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:37,349 INFO L82 PathProgramCache]: Analyzing trace with hash -62633906, now seen corresponding path program 23 times [2018-12-03 18:16:37,349 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:37,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:37,350 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:37,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:37,350 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:37,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:38,011 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:38,012 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:38,012 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:38,012 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:38,012 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:38,012 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:38,012 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 18:16:38,022 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:38,022 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:38,043 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-12-03 18:16:38,043 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:38,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:38,429 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:38,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:39,126 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:39,146 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:39,146 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 72 [2018-12-03 18:16:39,147 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:39,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-12-03 18:16:39,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-12-03 18:16:39,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:16:39,149 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 50 states. [2018-12-03 18:16:39,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:39,450 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-12-03 18:16:39,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-12-03 18:16:39,451 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 49 [2018-12-03 18:16:39,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:39,452 INFO L225 Difference]: With dead ends: 53 [2018-12-03 18:16:39,452 INFO L226 Difference]: Without dead ends: 52 [2018-12-03 18:16:39,453 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2256 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2425, Invalid=2977, Unknown=0, NotChecked=0, Total=5402 [2018-12-03 18:16:39,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-12-03 18:16:39,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-12-03 18:16:39,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-12-03 18:16:39,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-12-03 18:16:39,458 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-12-03 18:16:39,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:39,458 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-12-03 18:16:39,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-12-03 18:16:39,458 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-12-03 18:16:39,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-12-03 18:16:39,460 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:39,460 INFO L402 BasicCegarLoop]: trace histogram [25, 24, 1, 1] [2018-12-03 18:16:39,460 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:39,462 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:39,462 INFO L82 PathProgramCache]: Analyzing trace with hash -61640432, now seen corresponding path program 24 times [2018-12-03 18:16:39,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:39,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:39,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:39,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:39,466 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:39,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:39,849 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:39,849 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:39,849 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:39,850 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:39,850 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:39,850 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:39,850 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 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 18:16:39,858 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:39,858 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:39,871 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:39,871 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:39,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:40,353 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:40,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:41,609 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:41,628 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:41,629 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 75 [2018-12-03 18:16:41,629 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:41,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-12-03 18:16:41,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-12-03 18:16:41,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:16:41,630 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 52 states. [2018-12-03 18:16:41,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:41,744 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-12-03 18:16:41,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-12-03 18:16:41,745 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 51 [2018-12-03 18:16:41,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:41,746 INFO L225 Difference]: With dead ends: 55 [2018-12-03 18:16:41,746 INFO L226 Difference]: Without dead ends: 54 [2018-12-03 18:16:41,747 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2626, Invalid=3226, Unknown=0, NotChecked=0, Total=5852 [2018-12-03 18:16:41,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-12-03 18:16:41,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-12-03 18:16:41,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-12-03 18:16:41,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-12-03 18:16:41,752 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-12-03 18:16:41,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:41,752 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-12-03 18:16:41,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-12-03 18:16:41,752 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-12-03 18:16:41,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-12-03 18:16:41,753 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:41,753 INFO L402 BasicCegarLoop]: trace histogram [26, 25, 1, 1] [2018-12-03 18:16:41,753 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:41,753 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:41,754 INFO L82 PathProgramCache]: Analyzing trace with hash 893088082, now seen corresponding path program 25 times [2018-12-03 18:16:41,754 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:41,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:41,755 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:41,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:41,755 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:41,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:42,119 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:42,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:42,119 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:42,119 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:42,119 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:42,119 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:42,119 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 18:16:42,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:42,130 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:42,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:42,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:42,596 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:42,597 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:43,649 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:43,667 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:43,667 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 78 [2018-12-03 18:16:43,668 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:43,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-12-03 18:16:43,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-12-03 18:16:43,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:16:43,670 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 54 states. [2018-12-03 18:16:43,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:43,834 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-12-03 18:16:43,835 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-12-03 18:16:43,835 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 53 [2018-12-03 18:16:43,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:43,836 INFO L225 Difference]: With dead ends: 57 [2018-12-03 18:16:43,836 INFO L226 Difference]: Without dead ends: 56 [2018-12-03 18:16:43,837 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2652 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2835, Invalid=3485, Unknown=0, NotChecked=0, Total=6320 [2018-12-03 18:16:43,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-12-03 18:16:43,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-12-03 18:16:43,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-12-03 18:16:43,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-12-03 18:16:43,842 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-12-03 18:16:43,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:43,842 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-12-03 18:16:43,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-12-03 18:16:43,842 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-12-03 18:16:43,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-12-03 18:16:43,843 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:43,843 INFO L402 BasicCegarLoop]: trace histogram [27, 26, 1, 1] [2018-12-03 18:16:43,843 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:43,843 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:43,844 INFO L82 PathProgramCache]: Analyzing trace with hash -735811308, now seen corresponding path program 26 times [2018-12-03 18:16:43,844 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:43,844 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:43,844 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:43,845 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:43,845 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:43,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:44,299 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:44,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:44,299 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:44,299 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:44,299 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:44,300 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:44,300 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 18:16:44,309 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:44,309 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:44,334 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-12-03 18:16:44,334 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:44,336 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:44,804 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:44,804 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:45,936 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:45,955 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:45,955 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 81 [2018-12-03 18:16:45,955 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:45,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-12-03 18:16:45,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-12-03 18:16:45,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 18:16:45,957 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 56 states. [2018-12-03 18:16:46,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:46,062 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-12-03 18:16:46,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-12-03 18:16:46,062 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 55 [2018-12-03 18:16:46,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:46,063 INFO L225 Difference]: With dead ends: 59 [2018-12-03 18:16:46,063 INFO L226 Difference]: Without dead ends: 58 [2018-12-03 18:16:46,064 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2862 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3052, Invalid=3754, Unknown=0, NotChecked=0, Total=6806 [2018-12-03 18:16:46,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-12-03 18:16:46,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-12-03 18:16:46,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-12-03 18:16:46,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-12-03 18:16:46,068 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-12-03 18:16:46,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:46,068 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-12-03 18:16:46,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-12-03 18:16:46,068 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-12-03 18:16:46,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-12-03 18:16:46,069 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:46,069 INFO L402 BasicCegarLoop]: trace histogram [28, 27, 1, 1] [2018-12-03 18:16:46,069 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:46,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:46,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1554937942, now seen corresponding path program 27 times [2018-12-03 18:16:46,069 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:46,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:46,070 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:46,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:46,070 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:46,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:46,671 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:46,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:46,672 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:46,672 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:46,672 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:46,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:46,672 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 18:16:46,682 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:46,682 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:46,696 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:46,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:46,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:47,247 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:47,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:48,156 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:48,175 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:48,175 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 84 [2018-12-03 18:16:48,175 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:48,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-12-03 18:16:48,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-12-03 18:16:48,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:16:48,177 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 58 states. [2018-12-03 18:16:48,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:48,311 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-12-03 18:16:48,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-12-03 18:16:48,312 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 57 [2018-12-03 18:16:48,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:48,312 INFO L225 Difference]: With dead ends: 61 [2018-12-03 18:16:48,313 INFO L226 Difference]: Without dead ends: 60 [2018-12-03 18:16:48,313 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3080 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=3277, Invalid=4033, Unknown=0, NotChecked=0, Total=7310 [2018-12-03 18:16:48,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-12-03 18:16:48,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-12-03 18:16:48,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-12-03 18:16:48,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-12-03 18:16:48,317 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 57 [2018-12-03 18:16:48,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:48,317 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-12-03 18:16:48,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-12-03 18:16:48,317 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-12-03 18:16:48,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-12-03 18:16:48,318 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:48,318 INFO L402 BasicCegarLoop]: trace histogram [29, 28, 1, 1] [2018-12-03 18:16:48,318 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:48,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:48,319 INFO L82 PathProgramCache]: Analyzing trace with hash -353255656, now seen corresponding path program 28 times [2018-12-03 18:16:48,319 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:48,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:48,320 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:48,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:48,320 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:48,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:48,903 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:48,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:48,904 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:48,904 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:48,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:48,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:48,904 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 18:16:48,913 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:48,913 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:48,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:48,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:49,467 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:49,467 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:50,436 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:50,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:50,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 87 [2018-12-03 18:16:50,456 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:50,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-12-03 18:16:50,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-12-03 18:16:50,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:16:50,457 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 60 states. [2018-12-03 18:16:50,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:50,683 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-12-03 18:16:50,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-12-03 18:16:50,683 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 59 [2018-12-03 18:16:50,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:50,684 INFO L225 Difference]: With dead ends: 63 [2018-12-03 18:16:50,684 INFO L226 Difference]: Without dead ends: 62 [2018-12-03 18:16:50,685 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3306 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3510, Invalid=4322, Unknown=0, NotChecked=0, Total=7832 [2018-12-03 18:16:50,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-12-03 18:16:50,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-12-03 18:16:50,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-12-03 18:16:50,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-12-03 18:16:50,689 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 59 [2018-12-03 18:16:50,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:50,689 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-12-03 18:16:50,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-12-03 18:16:50,690 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-12-03 18:16:50,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-12-03 18:16:50,690 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:50,690 INFO L402 BasicCegarLoop]: trace histogram [30, 29, 1, 1] [2018-12-03 18:16:50,690 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:50,691 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:50,691 INFO L82 PathProgramCache]: Analyzing trace with hash -176267942, now seen corresponding path program 29 times [2018-12-03 18:16:50,691 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:50,691 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:50,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:50,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:50,692 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:50,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:51,243 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:51,243 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:51,244 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:51,244 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:51,244 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:51,244 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:51,244 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 18:16:51,252 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:51,253 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:51,279 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-12-03 18:16:51,280 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:51,281 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:51,883 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:51,883 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:52,977 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:52,997 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:52,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 90 [2018-12-03 18:16:52,997 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:52,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-12-03 18:16:52,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-12-03 18:16:52,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:16:52,999 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 62 states. [2018-12-03 18:16:53,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:53,155 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-12-03 18:16:53,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-12-03 18:16:53,155 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 61 [2018-12-03 18:16:53,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:53,156 INFO L225 Difference]: With dead ends: 65 [2018-12-03 18:16:53,156 INFO L226 Difference]: Without dead ends: 64 [2018-12-03 18:16:53,157 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3751, Invalid=4621, Unknown=0, NotChecked=0, Total=8372 [2018-12-03 18:16:53,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-12-03 18:16:53,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-12-03 18:16:53,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-12-03 18:16:53,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-12-03 18:16:53,161 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 61 [2018-12-03 18:16:53,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:53,161 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-12-03 18:16:53,161 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-12-03 18:16:53,161 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-12-03 18:16:53,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-12-03 18:16:53,161 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:53,162 INFO L402 BasicCegarLoop]: trace histogram [31, 30, 1, 1] [2018-12-03 18:16:53,162 INFO L423 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:53,162 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:53,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1889766628, now seen corresponding path program 30 times [2018-12-03 18:16:53,162 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:53,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:53,163 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:53,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:53,163 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:53,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:53,641 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:53,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:53,641 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:53,642 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:53,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:53,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:53,642 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:16:53,653 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:16:53,653 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:16:53,669 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:16:53,670 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:53,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:54,245 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:54,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:55,385 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:55,404 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:55,404 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 93 [2018-12-03 18:16:55,404 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:55,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-12-03 18:16:55,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-12-03 18:16:55,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:16:55,406 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 64 states. [2018-12-03 18:16:55,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:55,538 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-12-03 18:16:55,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-12-03 18:16:55,538 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 63 [2018-12-03 18:16:55,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:55,539 INFO L225 Difference]: With dead ends: 67 [2018-12-03 18:16:55,539 INFO L226 Difference]: Without dead ends: 66 [2018-12-03 18:16:55,541 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3782 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4000, Invalid=4930, Unknown=0, NotChecked=0, Total=8930 [2018-12-03 18:16:55,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-12-03 18:16:55,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-12-03 18:16:55,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-12-03 18:16:55,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-12-03 18:16:55,543 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 63 [2018-12-03 18:16:55,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:55,544 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-12-03 18:16:55,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-12-03 18:16:55,544 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-12-03 18:16:55,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-12-03 18:16:55,544 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:55,544 INFO L402 BasicCegarLoop]: trace histogram [32, 31, 1, 1] [2018-12-03 18:16:55,545 INFO L423 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:55,545 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:55,545 INFO L82 PathProgramCache]: Analyzing trace with hash 705437790, now seen corresponding path program 31 times [2018-12-03 18:16:55,545 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:55,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:55,546 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:16:55,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:55,546 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:55,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:56,377 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:56,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:56,378 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:56,378 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:56,378 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:56,378 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:56,378 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 18:16:56,398 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:56,398 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:16:56,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:56,416 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:16:57,033 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:57,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:16:58,519 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:58,537 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:16:58,538 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 96 [2018-12-03 18:16:58,538 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:16:58,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-12-03 18:16:58,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-12-03 18:16:58,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:16:58,539 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 66 states. [2018-12-03 18:16:58,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:16:58,690 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-12-03 18:16:58,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-12-03 18:16:58,690 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 65 [2018-12-03 18:16:58,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:16:58,692 INFO L225 Difference]: With dead ends: 69 [2018-12-03 18:16:58,692 INFO L226 Difference]: Without dead ends: 68 [2018-12-03 18:16:58,693 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4032 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=4257, Invalid=5249, Unknown=0, NotChecked=0, Total=9506 [2018-12-03 18:16:58,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-12-03 18:16:58,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-12-03 18:16:58,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-12-03 18:16:58,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-12-03 18:16:58,697 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 65 [2018-12-03 18:16:58,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:16:58,697 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-12-03 18:16:58,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-12-03 18:16:58,697 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-12-03 18:16:58,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-12-03 18:16:58,698 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:16:58,698 INFO L402 BasicCegarLoop]: trace histogram [33, 32, 1, 1] [2018-12-03 18:16:58,698 INFO L423 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:16:58,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:16:58,698 INFO L82 PathProgramCache]: Analyzing trace with hash -679115488, now seen corresponding path program 32 times [2018-12-03 18:16:58,698 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:16:58,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:58,699 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:16:58,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:16:58,699 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:16:58,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:16:59,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:16:59,833 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:59,833 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:16:59,834 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:16:59,834 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:16:59,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:16:59,834 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 18:16:59,843 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:16:59,843 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:16:59,873 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-12-03 18:16:59,873 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:16:59,875 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:00,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:00,765 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:02,323 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:02,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:02,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 99 [2018-12-03 18:17:02,343 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:02,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-12-03 18:17:02,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-12-03 18:17:02,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:17:02,345 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 68 states. [2018-12-03 18:17:02,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:02,474 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-12-03 18:17:02,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-12-03 18:17:02,474 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 67 [2018-12-03 18:17:02,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:02,475 INFO L225 Difference]: With dead ends: 71 [2018-12-03 18:17:02,475 INFO L226 Difference]: Without dead ends: 70 [2018-12-03 18:17:02,477 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4290 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=4522, Invalid=5578, Unknown=0, NotChecked=0, Total=10100 [2018-12-03 18:17:02,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-12-03 18:17:02,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-12-03 18:17:02,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-12-03 18:17:02,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-12-03 18:17:02,480 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 67 [2018-12-03 18:17:02,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:02,480 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-12-03 18:17:02,480 INFO L481 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-12-03 18:17:02,480 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-12-03 18:17:02,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-12-03 18:17:02,481 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:02,481 INFO L402 BasicCegarLoop]: trace histogram [34, 33, 1, 1] [2018-12-03 18:17:02,481 INFO L423 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:02,481 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:02,481 INFO L82 PathProgramCache]: Analyzing trace with hash 205046114, now seen corresponding path program 33 times [2018-12-03 18:17:02,481 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:02,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:02,482 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:02,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:02,482 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:02,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:03,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:03,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:03,042 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:03,043 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:03,043 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:03,043 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:03,043 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 18:17:03,051 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:03,051 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:03,070 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:03,070 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:03,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:03,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:03,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:05,388 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:05,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:05,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 102 [2018-12-03 18:17:05,407 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:05,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-12-03 18:17:05,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-12-03 18:17:05,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:17:05,408 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 70 states. [2018-12-03 18:17:05,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:05,577 INFO L93 Difference]: Finished difference Result 73 states and 73 transitions. [2018-12-03 18:17:05,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-12-03 18:17:05,578 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 69 [2018-12-03 18:17:05,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:05,578 INFO L225 Difference]: With dead ends: 73 [2018-12-03 18:17:05,579 INFO L226 Difference]: Without dead ends: 72 [2018-12-03 18:17:05,579 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4556 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=4795, Invalid=5917, Unknown=0, NotChecked=0, Total=10712 [2018-12-03 18:17:05,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-12-03 18:17:05,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-12-03 18:17:05,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-12-03 18:17:05,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-12-03 18:17:05,582 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 69 [2018-12-03 18:17:05,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:05,582 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-12-03 18:17:05,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-12-03 18:17:05,582 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-12-03 18:17:05,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-12-03 18:17:05,583 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:05,583 INFO L402 BasicCegarLoop]: trace histogram [35, 34, 1, 1] [2018-12-03 18:17:05,583 INFO L423 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:05,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:05,583 INFO L82 PathProgramCache]: Analyzing trace with hash -519178972, now seen corresponding path program 34 times [2018-12-03 18:17:05,584 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:05,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:05,584 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:05,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:05,584 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:05,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:06,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:06,406 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:06,406 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:06,407 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:06,407 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:06,407 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:06,407 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 18:17:06,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:06,416 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:06,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:06,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:07,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:07,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:08,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:08,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:08,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 105 [2018-12-03 18:17:08,566 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:08,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-12-03 18:17:08,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-12-03 18:17:08,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:17:08,568 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 72 states. [2018-12-03 18:17:08,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:08,706 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-12-03 18:17:08,706 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-12-03 18:17:08,706 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 71 [2018-12-03 18:17:08,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:08,708 INFO L225 Difference]: With dead ends: 75 [2018-12-03 18:17:08,708 INFO L226 Difference]: Without dead ends: 74 [2018-12-03 18:17:08,709 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4830 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=5076, Invalid=6266, Unknown=0, NotChecked=0, Total=11342 [2018-12-03 18:17:08,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-12-03 18:17:08,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-12-03 18:17:08,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-12-03 18:17:08,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-12-03 18:17:08,713 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 71 [2018-12-03 18:17:08,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:08,713 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-12-03 18:17:08,714 INFO L481 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-12-03 18:17:08,714 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-12-03 18:17:08,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-12-03 18:17:08,714 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:08,714 INFO L402 BasicCegarLoop]: trace histogram [36, 35, 1, 1] [2018-12-03 18:17:08,715 INFO L423 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:08,715 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:08,715 INFO L82 PathProgramCache]: Analyzing trace with hash -714784666, now seen corresponding path program 35 times [2018-12-03 18:17:08,715 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:08,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:08,716 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:08,716 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:08,716 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:08,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:09,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:09,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:09,329 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:09,329 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:09,329 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:09,329 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:09,329 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 18:17:09,338 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:17:09,338 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:17:09,375 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-12-03 18:17:09,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:09,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:10,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:10,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:12,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:12,066 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:12,067 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 108 [2018-12-03 18:17:12,067 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:12,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-12-03 18:17:12,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-12-03 18:17:12,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:17:12,068 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 74 states. [2018-12-03 18:17:12,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:12,656 INFO L93 Difference]: Finished difference Result 77 states and 77 transitions. [2018-12-03 18:17:12,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-12-03 18:17:12,656 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 73 [2018-12-03 18:17:12,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:12,656 INFO L225 Difference]: With dead ends: 77 [2018-12-03 18:17:12,657 INFO L226 Difference]: Without dead ends: 76 [2018-12-03 18:17:12,657 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5112 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=5365, Invalid=6625, Unknown=0, NotChecked=0, Total=11990 [2018-12-03 18:17:12,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-12-03 18:17:12,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-12-03 18:17:12,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-12-03 18:17:12,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2018-12-03 18:17:12,660 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 73 [2018-12-03 18:17:12,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:12,660 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2018-12-03 18:17:12,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-12-03 18:17:12,660 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2018-12-03 18:17:12,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-12-03 18:17:12,660 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:12,660 INFO L402 BasicCegarLoop]: trace histogram [37, 36, 1, 1] [2018-12-03 18:17:12,661 INFO L423 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:12,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:12,661 INFO L82 PathProgramCache]: Analyzing trace with hash 286704424, now seen corresponding path program 36 times [2018-12-03 18:17:12,661 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:12,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:12,662 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:12,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:12,662 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:12,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:13,312 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:13,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:13,312 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:13,312 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:13,312 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:13,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:13,313 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 18:17:13,322 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:13,322 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:13,341 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:13,342 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:13,343 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:14,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:14,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:15,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:15,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:15,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 111 [2018-12-03 18:17:15,731 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:15,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-12-03 18:17:15,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-12-03 18:17:15,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:17:15,733 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 76 states. [2018-12-03 18:17:15,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:15,875 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2018-12-03 18:17:15,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-12-03 18:17:15,875 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 75 [2018-12-03 18:17:15,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:15,876 INFO L225 Difference]: With dead ends: 79 [2018-12-03 18:17:15,876 INFO L226 Difference]: Without dead ends: 78 [2018-12-03 18:17:15,878 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5402 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=5662, Invalid=6994, Unknown=0, NotChecked=0, Total=12656 [2018-12-03 18:17:15,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-12-03 18:17:15,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2018-12-03 18:17:15,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-12-03 18:17:15,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 78 transitions. [2018-12-03 18:17:15,882 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 78 transitions. Word has length 75 [2018-12-03 18:17:15,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:15,882 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 78 transitions. [2018-12-03 18:17:15,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-12-03 18:17:15,882 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 78 transitions. [2018-12-03 18:17:15,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-12-03 18:17:15,883 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:15,883 INFO L402 BasicCegarLoop]: trace histogram [38, 37, 1, 1] [2018-12-03 18:17:15,883 INFO L423 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:15,883 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:15,884 INFO L82 PathProgramCache]: Analyzing trace with hash 645045610, now seen corresponding path program 37 times [2018-12-03 18:17:15,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:15,884 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:15,884 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:15,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:15,885 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:15,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:17,154 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:17,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:17,155 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:17,155 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:17,155 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:17,155 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:17,155 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 18:17:17,165 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:17,165 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:17,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:17,186 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:18,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:18,011 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:19,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:19,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:19,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 114 [2018-12-03 18:17:19,728 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:19,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 78 states [2018-12-03 18:17:19,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2018-12-03 18:17:19,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 18:17:19,730 INFO L87 Difference]: Start difference. First operand 78 states and 78 transitions. Second operand 78 states. [2018-12-03 18:17:19,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:19,884 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-12-03 18:17:19,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-12-03 18:17:19,884 INFO L78 Accepts]: Start accepts. Automaton has 78 states. Word has length 77 [2018-12-03 18:17:19,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:19,885 INFO L225 Difference]: With dead ends: 81 [2018-12-03 18:17:19,885 INFO L226 Difference]: Without dead ends: 80 [2018-12-03 18:17:19,886 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5700 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5967, Invalid=7373, Unknown=0, NotChecked=0, Total=13340 [2018-12-03 18:17:19,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-12-03 18:17:19,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2018-12-03 18:17:19,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-12-03 18:17:19,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 80 transitions. [2018-12-03 18:17:19,890 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 80 transitions. Word has length 77 [2018-12-03 18:17:19,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:19,890 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 80 transitions. [2018-12-03 18:17:19,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has 78 states. [2018-12-03 18:17:19,890 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 80 transitions. [2018-12-03 18:17:19,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2018-12-03 18:17:19,890 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:19,890 INFO L402 BasicCegarLoop]: trace histogram [39, 38, 1, 1] [2018-12-03 18:17:19,891 INFO L423 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:19,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:19,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1413541676, now seen corresponding path program 38 times [2018-12-03 18:17:19,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:19,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:19,892 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:19,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:19,892 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:19,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:20,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:20,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:20,663 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:20,664 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:20,664 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:20,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:20,664 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 18:17:20,672 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:17:20,673 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:17:20,706 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-12-03 18:17:20,707 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:20,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:21,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:21,939 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:23,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:23,867 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:23,867 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 117 [2018-12-03 18:17:23,867 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:23,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2018-12-03 18:17:23,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2018-12-03 18:17:23,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:17:23,870 INFO L87 Difference]: Start difference. First operand 80 states and 80 transitions. Second operand 80 states. [2018-12-03 18:17:24,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:24,060 INFO L93 Difference]: Finished difference Result 83 states and 83 transitions. [2018-12-03 18:17:24,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-12-03 18:17:24,060 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 79 [2018-12-03 18:17:24,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:24,061 INFO L225 Difference]: With dead ends: 83 [2018-12-03 18:17:24,061 INFO L226 Difference]: Without dead ends: 82 [2018-12-03 18:17:24,063 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6006 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=6280, Invalid=7762, Unknown=0, NotChecked=0, Total=14042 [2018-12-03 18:17:24,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2018-12-03 18:17:24,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2018-12-03 18:17:24,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-12-03 18:17:24,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 82 transitions. [2018-12-03 18:17:24,066 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 82 transitions. Word has length 79 [2018-12-03 18:17:24,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:24,066 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 82 transitions. [2018-12-03 18:17:24,066 INFO L481 AbstractCegarLoop]: Interpolant automaton has 80 states. [2018-12-03 18:17:24,066 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 82 transitions. [2018-12-03 18:17:24,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-12-03 18:17:24,066 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:24,066 INFO L402 BasicCegarLoop]: trace histogram [40, 39, 1, 1] [2018-12-03 18:17:24,067 INFO L423 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:24,067 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:24,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1203886190, now seen corresponding path program 39 times [2018-12-03 18:17:24,067 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:24,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:24,068 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:24,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:24,068 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:24,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:25,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:25,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:25,148 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:25,148 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:25,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:25,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:25,149 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:17:25,159 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:25,159 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:25,178 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:25,179 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:25,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:26,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:26,147 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:28,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1560 backedges. 0 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:28,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:28,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 120 [2018-12-03 18:17:28,281 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:28,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 82 states [2018-12-03 18:17:28,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2018-12-03 18:17:28,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:17:28,283 INFO L87 Difference]: Start difference. First operand 82 states and 82 transitions. Second operand 82 states. [2018-12-03 18:17:28,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:28,439 INFO L93 Difference]: Finished difference Result 85 states and 85 transitions. [2018-12-03 18:17:28,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-12-03 18:17:28,440 INFO L78 Accepts]: Start accepts. Automaton has 82 states. Word has length 81 [2018-12-03 18:17:28,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:28,440 INFO L225 Difference]: With dead ends: 85 [2018-12-03 18:17:28,441 INFO L226 Difference]: Without dead ends: 84 [2018-12-03 18:17:28,442 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6320 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=6601, Invalid=8161, Unknown=0, NotChecked=0, Total=14762 [2018-12-03 18:17:28,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-12-03 18:17:28,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-12-03 18:17:28,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-12-03 18:17:28,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 84 transitions. [2018-12-03 18:17:28,444 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 84 transitions. Word has length 81 [2018-12-03 18:17:28,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:28,445 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 84 transitions. [2018-12-03 18:17:28,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has 82 states. [2018-12-03 18:17:28,445 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 84 transitions. [2018-12-03 18:17:28,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-12-03 18:17:28,445 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:28,445 INFO L402 BasicCegarLoop]: trace histogram [41, 40, 1, 1] [2018-12-03 18:17:28,446 INFO L423 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:28,446 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:28,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1588427056, now seen corresponding path program 40 times [2018-12-03 18:17:28,446 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:28,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:28,447 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:28,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:28,447 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:28,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:29,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:29,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:29,222 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:29,222 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:29,222 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:29,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:29,222 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 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 18:17:29,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:29,231 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:29,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:29,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:30,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:30,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:32,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1640 backedges. 0 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:32,492 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:32,492 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 123 [2018-12-03 18:17:32,493 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:32,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 84 states [2018-12-03 18:17:32,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2018-12-03 18:17:32,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 18:17:32,494 INFO L87 Difference]: Start difference. First operand 84 states and 84 transitions. Second operand 84 states. [2018-12-03 18:17:32,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:32,677 INFO L93 Difference]: Finished difference Result 87 states and 87 transitions. [2018-12-03 18:17:32,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-12-03 18:17:32,678 INFO L78 Accepts]: Start accepts. Automaton has 84 states. Word has length 83 [2018-12-03 18:17:32,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:32,679 INFO L225 Difference]: With dead ends: 87 [2018-12-03 18:17:32,679 INFO L226 Difference]: Without dead ends: 86 [2018-12-03 18:17:32,680 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6642 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=6930, Invalid=8570, Unknown=0, NotChecked=0, Total=15500 [2018-12-03 18:17:32,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2018-12-03 18:17:32,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2018-12-03 18:17:32,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-12-03 18:17:32,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 86 transitions. [2018-12-03 18:17:32,684 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 86 transitions. Word has length 83 [2018-12-03 18:17:32,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:32,685 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 86 transitions. [2018-12-03 18:17:32,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has 84 states. [2018-12-03 18:17:32,685 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 86 transitions. [2018-12-03 18:17:32,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-12-03 18:17:32,686 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:32,686 INFO L402 BasicCegarLoop]: trace histogram [42, 41, 1, 1] [2018-12-03 18:17:32,686 INFO L423 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:32,686 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:32,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1765011826, now seen corresponding path program 41 times [2018-12-03 18:17:32,686 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:32,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:32,687 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:32,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:32,688 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:32,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:33,696 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:33,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:33,696 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:33,696 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:33,696 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:33,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:33,697 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 18:17:33,705 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:17:33,705 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:17:33,741 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-12-03 18:17:33,741 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:33,743 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:34,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:34,826 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:37,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1722 backedges. 0 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:37,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:37,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 126 [2018-12-03 18:17:37,253 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:37,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2018-12-03 18:17:37,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2018-12-03 18:17:37,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:17:37,255 INFO L87 Difference]: Start difference. First operand 86 states and 86 transitions. Second operand 86 states. [2018-12-03 18:17:37,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:37,450 INFO L93 Difference]: Finished difference Result 89 states and 89 transitions. [2018-12-03 18:17:37,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-12-03 18:17:37,450 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 85 [2018-12-03 18:17:37,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:37,451 INFO L225 Difference]: With dead ends: 89 [2018-12-03 18:17:37,452 INFO L226 Difference]: Without dead ends: 88 [2018-12-03 18:17:37,453 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6972 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=7267, Invalid=8989, Unknown=0, NotChecked=0, Total=16256 [2018-12-03 18:17:37,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2018-12-03 18:17:37,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2018-12-03 18:17:37,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-12-03 18:17:37,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 88 transitions. [2018-12-03 18:17:37,458 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 88 transitions. Word has length 85 [2018-12-03 18:17:37,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:37,458 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 88 transitions. [2018-12-03 18:17:37,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has 86 states. [2018-12-03 18:17:37,458 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 88 transitions. [2018-12-03 18:17:37,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-12-03 18:17:37,459 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:37,459 INFO L402 BasicCegarLoop]: trace histogram [43, 42, 1, 1] [2018-12-03 18:17:37,459 INFO L423 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:37,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:37,460 INFO L82 PathProgramCache]: Analyzing trace with hash -335716044, now seen corresponding path program 42 times [2018-12-03 18:17:37,460 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:37,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:37,460 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:37,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:37,461 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:37,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:38,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:38,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:38,353 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:38,353 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:38,353 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:38,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:38,353 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 18:17:38,363 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:38,363 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:38,385 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:38,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:38,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:39,492 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:39,492 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:41,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1806 backedges. 0 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:41,704 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:41,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 129 [2018-12-03 18:17:41,705 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:41,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 88 states [2018-12-03 18:17:41,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2018-12-03 18:17:41,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 18:17:41,707 INFO L87 Difference]: Start difference. First operand 88 states and 88 transitions. Second operand 88 states. [2018-12-03 18:17:41,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:41,985 INFO L93 Difference]: Finished difference Result 91 states and 91 transitions. [2018-12-03 18:17:41,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-12-03 18:17:41,986 INFO L78 Accepts]: Start accepts. Automaton has 88 states. Word has length 87 [2018-12-03 18:17:41,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:41,986 INFO L225 Difference]: With dead ends: 91 [2018-12-03 18:17:41,987 INFO L226 Difference]: Without dead ends: 90 [2018-12-03 18:17:41,988 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7310 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=7612, Invalid=9418, Unknown=0, NotChecked=0, Total=17030 [2018-12-03 18:17:41,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-12-03 18:17:41,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-12-03 18:17:41,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-12-03 18:17:41,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 90 transitions. [2018-12-03 18:17:41,991 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 90 transitions. Word has length 87 [2018-12-03 18:17:41,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:41,991 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 90 transitions. [2018-12-03 18:17:41,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 88 states. [2018-12-03 18:17:41,992 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 90 transitions. [2018-12-03 18:17:41,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-12-03 18:17:41,992 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:41,992 INFO L402 BasicCegarLoop]: trace histogram [44, 43, 1, 1] [2018-12-03 18:17:41,992 INFO L423 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:41,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:41,993 INFO L82 PathProgramCache]: Analyzing trace with hash -500569994, now seen corresponding path program 43 times [2018-12-03 18:17:41,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:41,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:41,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:41,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:41,994 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:42,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:43,484 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:43,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:43,485 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:43,485 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:43,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:43,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:43,485 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 18:17:43,494 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:43,494 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:43,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:43,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:44,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:44,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:46,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1892 backedges. 0 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:46,844 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:46,844 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 132 [2018-12-03 18:17:46,845 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:46,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-12-03 18:17:46,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-12-03 18:17:46,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:17:46,847 INFO L87 Difference]: Start difference. First operand 90 states and 90 transitions. Second operand 90 states. [2018-12-03 18:17:47,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:47,177 INFO L93 Difference]: Finished difference Result 93 states and 93 transitions. [2018-12-03 18:17:47,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-12-03 18:17:47,177 INFO L78 Accepts]: Start accepts. Automaton has 90 states. Word has length 89 [2018-12-03 18:17:47,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:47,178 INFO L225 Difference]: With dead ends: 93 [2018-12-03 18:17:47,178 INFO L226 Difference]: Without dead ends: 92 [2018-12-03 18:17:47,178 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7656 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=7965, Invalid=9857, Unknown=0, NotChecked=0, Total=17822 [2018-12-03 18:17:47,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-12-03 18:17:47,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2018-12-03 18:17:47,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2018-12-03 18:17:47,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 92 transitions. [2018-12-03 18:17:47,182 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 92 transitions. Word has length 89 [2018-12-03 18:17:47,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:47,183 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 92 transitions. [2018-12-03 18:17:47,183 INFO L481 AbstractCegarLoop]: Interpolant automaton has 90 states. [2018-12-03 18:17:47,183 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 92 transitions. [2018-12-03 18:17:47,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2018-12-03 18:17:47,183 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:47,183 INFO L402 BasicCegarLoop]: trace histogram [45, 44, 1, 1] [2018-12-03 18:17:47,184 INFO L423 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:47,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:47,184 INFO L82 PathProgramCache]: Analyzing trace with hash -11425992, now seen corresponding path program 44 times [2018-12-03 18:17:47,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:47,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:47,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:47,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:47,185 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:47,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:48,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:48,239 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:48,240 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:48,240 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:48,240 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:48,240 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:48,240 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 18:17:48,249 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:17:48,249 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:17:48,288 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2018-12-03 18:17:48,288 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:48,291 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:49,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:49,437 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 0 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:51,770 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:51,770 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 135 [2018-12-03 18:17:51,770 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:51,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2018-12-03 18:17:51,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2018-12-03 18:17:51,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:17:51,773 INFO L87 Difference]: Start difference. First operand 92 states and 92 transitions. Second operand 92 states. [2018-12-03 18:17:51,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:51,984 INFO L93 Difference]: Finished difference Result 95 states and 95 transitions. [2018-12-03 18:17:51,984 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-12-03 18:17:51,985 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 91 [2018-12-03 18:17:51,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:51,985 INFO L225 Difference]: With dead ends: 95 [2018-12-03 18:17:51,985 INFO L226 Difference]: Without dead ends: 94 [2018-12-03 18:17:51,987 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8010 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=8326, Invalid=10306, Unknown=0, NotChecked=0, Total=18632 [2018-12-03 18:17:51,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2018-12-03 18:17:51,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2018-12-03 18:17:51,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-12-03 18:17:51,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 94 transitions. [2018-12-03 18:17:51,990 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 94 transitions. Word has length 91 [2018-12-03 18:17:51,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:51,991 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 94 transitions. [2018-12-03 18:17:51,991 INFO L481 AbstractCegarLoop]: Interpolant automaton has 92 states. [2018-12-03 18:17:51,991 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 94 transitions. [2018-12-03 18:17:51,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-12-03 18:17:51,992 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:51,992 INFO L402 BasicCegarLoop]: trace histogram [46, 45, 1, 1] [2018-12-03 18:17:51,992 INFO L423 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:51,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:51,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1904524666, now seen corresponding path program 45 times [2018-12-03 18:17:51,992 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:51,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:51,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:51,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:51,993 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:52,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:53,186 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:53,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:53,186 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:53,186 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:53,186 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:53,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:53,187 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 18:17:53,198 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:17:53,199 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:17:53,242 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:17:53,243 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:17:53,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:17:54,458 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:54,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:17:57,091 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 0 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:57,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:17:57,110 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 138 [2018-12-03 18:17:57,110 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:17:57,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 94 states [2018-12-03 18:17:57,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2018-12-03 18:17:57,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 18:17:57,114 INFO L87 Difference]: Start difference. First operand 94 states and 94 transitions. Second operand 94 states. [2018-12-03 18:17:57,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:17:57,446 INFO L93 Difference]: Finished difference Result 97 states and 97 transitions. [2018-12-03 18:17:57,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-12-03 18:17:57,446 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 93 [2018-12-03 18:17:57,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:17:57,447 INFO L225 Difference]: With dead ends: 97 [2018-12-03 18:17:57,447 INFO L226 Difference]: Without dead ends: 96 [2018-12-03 18:17:57,448 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8372 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=8695, Invalid=10765, Unknown=0, NotChecked=0, Total=19460 [2018-12-03 18:17:57,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-12-03 18:17:57,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2018-12-03 18:17:57,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-12-03 18:17:57,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 96 transitions. [2018-12-03 18:17:57,452 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 96 transitions. Word has length 93 [2018-12-03 18:17:57,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:17:57,452 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 96 transitions. [2018-12-03 18:17:57,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has 94 states. [2018-12-03 18:17:57,453 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 96 transitions. [2018-12-03 18:17:57,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-12-03 18:17:57,453 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:17:57,453 INFO L402 BasicCegarLoop]: trace histogram [47, 46, 1, 1] [2018-12-03 18:17:57,454 INFO L423 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:17:57,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:17:57,454 INFO L82 PathProgramCache]: Analyzing trace with hash 592137020, now seen corresponding path program 46 times [2018-12-03 18:17:57,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:17:57,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:57,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:17:57,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:17:57,455 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:17:57,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:58,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:17:58,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:58,972 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:17:58,972 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:17:58,972 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:17:58,972 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:17:58,972 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 18:17:58,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:17:58,981 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:17:59,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:17:59,008 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:00,751 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:00,751 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:03,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:03,676 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:03,676 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 141 [2018-12-03 18:18:03,676 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:03,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2018-12-03 18:18:03,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2018-12-03 18:18:03,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 18:18:03,679 INFO L87 Difference]: Start difference. First operand 96 states and 96 transitions. Second operand 96 states. [2018-12-03 18:18:03,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:03,902 INFO L93 Difference]: Finished difference Result 99 states and 99 transitions. [2018-12-03 18:18:03,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-12-03 18:18:03,902 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 95 [2018-12-03 18:18:03,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:03,903 INFO L225 Difference]: With dead ends: 99 [2018-12-03 18:18:03,904 INFO L226 Difference]: Without dead ends: 98 [2018-12-03 18:18:03,905 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8742 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=9072, Invalid=11234, Unknown=0, NotChecked=0, Total=20306 [2018-12-03 18:18:03,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-12-03 18:18:03,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2018-12-03 18:18:03,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-12-03 18:18:03,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 98 transitions. [2018-12-03 18:18:03,909 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 98 transitions. Word has length 95 [2018-12-03 18:18:03,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:03,909 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 98 transitions. [2018-12-03 18:18:03,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 96 states. [2018-12-03 18:18:03,909 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 98 transitions. [2018-12-03 18:18:03,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-12-03 18:18:03,909 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:03,909 INFO L402 BasicCegarLoop]: trace histogram [48, 47, 1, 1] [2018-12-03 18:18:03,910 INFO L423 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:03,910 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:03,910 INFO L82 PathProgramCache]: Analyzing trace with hash 2107994238, now seen corresponding path program 47 times [2018-12-03 18:18:03,910 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:03,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:03,911 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:03,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:03,911 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:03,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:04,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:04,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:04,973 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:04,973 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:04,973 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:04,973 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:04,973 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 18:18:04,981 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:18:04,981 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:18:05,024 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2018-12-03 18:18:05,024 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:05,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:06,365 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:06,366 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:09,403 INFO L134 CoverageAnalysis]: Checked inductivity of 2256 backedges. 0 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:09,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:09,422 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 144 [2018-12-03 18:18:09,423 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:09,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2018-12-03 18:18:09,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2018-12-03 18:18:09,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:18:09,424 INFO L87 Difference]: Start difference. First operand 98 states and 98 transitions. Second operand 98 states. [2018-12-03 18:18:09,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:09,619 INFO L93 Difference]: Finished difference Result 101 states and 101 transitions. [2018-12-03 18:18:09,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-12-03 18:18:09,620 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 97 [2018-12-03 18:18:09,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:09,621 INFO L225 Difference]: With dead ends: 101 [2018-12-03 18:18:09,621 INFO L226 Difference]: Without dead ends: 100 [2018-12-03 18:18:09,621 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9120 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=9457, Invalid=11713, Unknown=0, NotChecked=0, Total=21170 [2018-12-03 18:18:09,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-12-03 18:18:09,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2018-12-03 18:18:09,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2018-12-03 18:18:09,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 100 transitions. [2018-12-03 18:18:09,625 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 100 transitions. Word has length 97 [2018-12-03 18:18:09,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:09,625 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 100 transitions. [2018-12-03 18:18:09,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 98 states. [2018-12-03 18:18:09,626 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 100 transitions. [2018-12-03 18:18:09,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2018-12-03 18:18:09,626 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:09,627 INFO L402 BasicCegarLoop]: trace histogram [49, 48, 1, 1] [2018-12-03 18:18:09,627 INFO L423 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:09,627 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:09,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1442099904, now seen corresponding path program 48 times [2018-12-03 18:18:09,627 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:09,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:09,628 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:09,628 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:09,628 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:09,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:10,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:10,755 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:10,755 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:10,755 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:10,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:10,756 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 18:18:10,763 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:18:10,764 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:18:10,790 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:18:10,790 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:10,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:12,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:12,142 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:15,199 INFO L134 CoverageAnalysis]: Checked inductivity of 2352 backedges. 0 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:15,218 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:15,218 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 147 [2018-12-03 18:18:15,218 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:15,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 100 states [2018-12-03 18:18:15,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2018-12-03 18:18:15,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2018-12-03 18:18:15,221 INFO L87 Difference]: Start difference. First operand 100 states and 100 transitions. Second operand 100 states. [2018-12-03 18:18:15,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:15,425 INFO L93 Difference]: Finished difference Result 103 states and 103 transitions. [2018-12-03 18:18:15,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-12-03 18:18:15,425 INFO L78 Accepts]: Start accepts. Automaton has 100 states. Word has length 99 [2018-12-03 18:18:15,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:15,426 INFO L225 Difference]: With dead ends: 103 [2018-12-03 18:18:15,426 INFO L226 Difference]: Without dead ends: 102 [2018-12-03 18:18:15,428 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9506 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=9850, Invalid=12202, Unknown=0, NotChecked=0, Total=22052 [2018-12-03 18:18:15,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2018-12-03 18:18:15,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2018-12-03 18:18:15,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-12-03 18:18:15,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 102 transitions. [2018-12-03 18:18:15,431 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 102 transitions. Word has length 99 [2018-12-03 18:18:15,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:15,431 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 102 transitions. [2018-12-03 18:18:15,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 100 states. [2018-12-03 18:18:15,432 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 102 transitions. [2018-12-03 18:18:15,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-12-03 18:18:15,432 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:15,432 INFO L402 BasicCegarLoop]: trace histogram [50, 49, 1, 1] [2018-12-03 18:18:15,433 INFO L423 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:15,433 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:15,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1416429954, now seen corresponding path program 49 times [2018-12-03 18:18:15,433 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:15,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:15,434 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:15,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:15,434 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:15,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:16,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:16,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:16,563 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:16,563 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:16,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:16,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:16,564 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 18:18:16,572 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:16,572 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:18:16,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:16,600 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:19,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:19,213 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:22,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2450 backedges. 0 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:22,402 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:22,402 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 150 [2018-12-03 18:18:22,402 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:22,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2018-12-03 18:18:22,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2018-12-03 18:18:22,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:18:22,405 INFO L87 Difference]: Start difference. First operand 102 states and 102 transitions. Second operand 102 states. [2018-12-03 18:18:22,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:22,642 INFO L93 Difference]: Finished difference Result 105 states and 105 transitions. [2018-12-03 18:18:22,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-12-03 18:18:22,642 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 101 [2018-12-03 18:18:22,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:22,644 INFO L225 Difference]: With dead ends: 105 [2018-12-03 18:18:22,644 INFO L226 Difference]: Without dead ends: 104 [2018-12-03 18:18:22,646 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9900 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=10251, Invalid=12701, Unknown=0, NotChecked=0, Total=22952 [2018-12-03 18:18:22,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-12-03 18:18:22,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 104. [2018-12-03 18:18:22,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-12-03 18:18:22,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 104 transitions. [2018-12-03 18:18:22,651 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 104 transitions. Word has length 101 [2018-12-03 18:18:22,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:22,651 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 104 transitions. [2018-12-03 18:18:22,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has 102 states. [2018-12-03 18:18:22,651 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 104 transitions. [2018-12-03 18:18:22,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-12-03 18:18:22,652 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:22,652 INFO L402 BasicCegarLoop]: trace histogram [51, 50, 1, 1] [2018-12-03 18:18:22,653 INFO L423 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:22,653 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:22,653 INFO L82 PathProgramCache]: Analyzing trace with hash -315445948, now seen corresponding path program 50 times [2018-12-03 18:18:22,653 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:22,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:22,654 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:22,654 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:22,654 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:22,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:24,410 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:24,410 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:24,410 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:24,411 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:24,411 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:24,411 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:24,411 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 18:18:24,420 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:18:24,420 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:18:24,487 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2018-12-03 18:18:24,487 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:24,490 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:25,986 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:25,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:29,248 INFO L134 CoverageAnalysis]: Checked inductivity of 2550 backedges. 0 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:29,267 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:29,267 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 153 [2018-12-03 18:18:29,267 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:29,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2018-12-03 18:18:29,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2018-12-03 18:18:29,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10660, Invalid=13210, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 18:18:29,271 INFO L87 Difference]: Start difference. First operand 104 states and 104 transitions. Second operand 104 states. [2018-12-03 18:18:29,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:29,946 INFO L93 Difference]: Finished difference Result 107 states and 107 transitions. [2018-12-03 18:18:29,947 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-12-03 18:18:29,947 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 103 [2018-12-03 18:18:29,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:29,948 INFO L225 Difference]: With dead ends: 107 [2018-12-03 18:18:29,948 INFO L226 Difference]: Without dead ends: 106 [2018-12-03 18:18:29,950 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10302 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=10660, Invalid=13210, Unknown=0, NotChecked=0, Total=23870 [2018-12-03 18:18:29,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-12-03 18:18:29,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2018-12-03 18:18:29,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-12-03 18:18:29,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 106 transitions. [2018-12-03 18:18:29,955 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 106 transitions. Word has length 103 [2018-12-03 18:18:29,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:29,956 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 106 transitions. [2018-12-03 18:18:29,956 INFO L481 AbstractCegarLoop]: Interpolant automaton has 104 states. [2018-12-03 18:18:29,956 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 106 transitions. [2018-12-03 18:18:29,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-12-03 18:18:29,956 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:29,957 INFO L402 BasicCegarLoop]: trace histogram [52, 51, 1, 1] [2018-12-03 18:18:29,957 INFO L423 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:29,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:29,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1799123078, now seen corresponding path program 51 times [2018-12-03 18:18:29,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:29,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:29,958 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:29,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:29,958 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:29,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:31,157 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:31,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:31,157 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:31,157 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:31,157 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:31,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:31,158 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:18:31,167 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:18:31,167 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:18:31,195 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:18:31,195 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:31,197 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:32,723 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:32,723 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:36,151 INFO L134 CoverageAnalysis]: Checked inductivity of 2652 backedges. 0 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:36,169 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:36,170 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 156 [2018-12-03 18:18:36,170 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:36,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 106 states [2018-12-03 18:18:36,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2018-12-03 18:18:36,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11077, Invalid=13729, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:18:36,173 INFO L87 Difference]: Start difference. First operand 106 states and 106 transitions. Second operand 106 states. [2018-12-03 18:18:36,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:36,408 INFO L93 Difference]: Finished difference Result 109 states and 109 transitions. [2018-12-03 18:18:36,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-12-03 18:18:36,409 INFO L78 Accepts]: Start accepts. Automaton has 106 states. Word has length 105 [2018-12-03 18:18:36,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:36,410 INFO L225 Difference]: With dead ends: 109 [2018-12-03 18:18:36,410 INFO L226 Difference]: Without dead ends: 108 [2018-12-03 18:18:36,412 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10712 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=11077, Invalid=13729, Unknown=0, NotChecked=0, Total=24806 [2018-12-03 18:18:36,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2018-12-03 18:18:36,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2018-12-03 18:18:36,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-12-03 18:18:36,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2018-12-03 18:18:36,417 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 105 [2018-12-03 18:18:36,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:36,418 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2018-12-03 18:18:36,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has 106 states. [2018-12-03 18:18:36,418 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2018-12-03 18:18:36,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2018-12-03 18:18:36,418 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:36,418 INFO L402 BasicCegarLoop]: trace histogram [53, 52, 1, 1] [2018-12-03 18:18:36,419 INFO L423 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:36,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:36,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1914541240, now seen corresponding path program 52 times [2018-12-03 18:18:36,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:36,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:36,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:36,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:36,420 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:36,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:37,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:37,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:37,870 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:37,870 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:37,870 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:37,870 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:37,870 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 18:18:37,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:37,878 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:18:37,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:37,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:39,747 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:39,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:43,114 INFO L134 CoverageAnalysis]: Checked inductivity of 2756 backedges. 0 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:43,133 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:43,133 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 159 [2018-12-03 18:18:43,133 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:43,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 108 states [2018-12-03 18:18:43,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2018-12-03 18:18:43,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11502, Invalid=14258, Unknown=0, NotChecked=0, Total=25760 [2018-12-03 18:18:43,136 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 108 states. [2018-12-03 18:18:43,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:43,533 INFO L93 Difference]: Finished difference Result 111 states and 111 transitions. [2018-12-03 18:18:43,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-12-03 18:18:43,533 INFO L78 Accepts]: Start accepts. Automaton has 108 states. Word has length 107 [2018-12-03 18:18:43,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:43,534 INFO L225 Difference]: With dead ends: 111 [2018-12-03 18:18:43,534 INFO L226 Difference]: Without dead ends: 110 [2018-12-03 18:18:43,535 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11130 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=11502, Invalid=14258, Unknown=0, NotChecked=0, Total=25760 [2018-12-03 18:18:43,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2018-12-03 18:18:43,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2018-12-03 18:18:43,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-12-03 18:18:43,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 110 transitions. [2018-12-03 18:18:43,538 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 110 transitions. Word has length 107 [2018-12-03 18:18:43,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:43,539 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 110 transitions. [2018-12-03 18:18:43,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has 108 states. [2018-12-03 18:18:43,539 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 110 transitions. [2018-12-03 18:18:43,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-12-03 18:18:43,539 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:43,540 INFO L402 BasicCegarLoop]: trace histogram [54, 53, 1, 1] [2018-12-03 18:18:43,540 INFO L423 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:43,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:43,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1628127862, now seen corresponding path program 53 times [2018-12-03 18:18:43,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:43,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:43,541 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:18:43,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:43,541 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:43,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:44,780 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 0 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:44,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:44,781 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:44,781 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:44,781 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:44,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:44,781 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 18:18:44,790 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:18:44,791 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:18:44,840 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2018-12-03 18:18:44,841 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:44,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:46,421 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 0 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:46,422 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:50,041 INFO L134 CoverageAnalysis]: Checked inductivity of 2862 backedges. 0 proven. 2862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:50,060 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:50,060 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 162 [2018-12-03 18:18:50,060 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:50,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2018-12-03 18:18:50,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2018-12-03 18:18:50,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11935, Invalid=14797, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:18:50,062 INFO L87 Difference]: Start difference. First operand 110 states and 110 transitions. Second operand 110 states. [2018-12-03 18:18:50,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:50,282 INFO L93 Difference]: Finished difference Result 113 states and 113 transitions. [2018-12-03 18:18:50,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-12-03 18:18:50,283 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 109 [2018-12-03 18:18:50,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:50,284 INFO L225 Difference]: With dead ends: 113 [2018-12-03 18:18:50,284 INFO L226 Difference]: Without dead ends: 112 [2018-12-03 18:18:50,285 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11556 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=11935, Invalid=14797, Unknown=0, NotChecked=0, Total=26732 [2018-12-03 18:18:50,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-12-03 18:18:50,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2018-12-03 18:18:50,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2018-12-03 18:18:50,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 112 transitions. [2018-12-03 18:18:50,288 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 112 transitions. Word has length 109 [2018-12-03 18:18:50,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:50,289 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 112 transitions. [2018-12-03 18:18:50,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has 110 states. [2018-12-03 18:18:50,289 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 112 transitions. [2018-12-03 18:18:50,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2018-12-03 18:18:50,289 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:50,289 INFO L402 BasicCegarLoop]: trace histogram [55, 54, 1, 1] [2018-12-03 18:18:50,289 INFO L423 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:50,290 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:50,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1262778548, now seen corresponding path program 54 times [2018-12-03 18:18:50,290 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:50,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:50,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:50,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:50,291 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:50,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:18:52,156 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 0 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:52,156 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:52,156 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:18:52,156 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:18:52,156 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:18:52,157 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:18:52,157 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 18:18:52,165 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:18:52,165 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:18:52,195 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:18:52,196 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:18:52,198 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:18:54,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 0 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:54,067 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:18:57,616 INFO L134 CoverageAnalysis]: Checked inductivity of 2970 backedges. 0 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:18:57,634 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:18:57,634 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 165 [2018-12-03 18:18:57,634 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:18:57,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 112 states [2018-12-03 18:18:57,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2018-12-03 18:18:57,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12376, Invalid=15346, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 18:18:57,637 INFO L87 Difference]: Start difference. First operand 112 states and 112 transitions. Second operand 112 states. [2018-12-03 18:18:58,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:18:58,885 INFO L93 Difference]: Finished difference Result 115 states and 115 transitions. [2018-12-03 18:18:58,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-12-03 18:18:58,885 INFO L78 Accepts]: Start accepts. Automaton has 112 states. Word has length 111 [2018-12-03 18:18:58,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:18:58,886 INFO L225 Difference]: With dead ends: 115 [2018-12-03 18:18:58,886 INFO L226 Difference]: Without dead ends: 114 [2018-12-03 18:18:58,887 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11990 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=12376, Invalid=15346, Unknown=0, NotChecked=0, Total=27722 [2018-12-03 18:18:58,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-12-03 18:18:58,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2018-12-03 18:18:58,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-12-03 18:18:58,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 114 transitions. [2018-12-03 18:18:58,892 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 114 transitions. Word has length 111 [2018-12-03 18:18:58,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:18:58,892 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 114 transitions. [2018-12-03 18:18:58,893 INFO L481 AbstractCegarLoop]: Interpolant automaton has 112 states. [2018-12-03 18:18:58,893 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 114 transitions. [2018-12-03 18:18:58,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-12-03 18:18:58,893 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:18:58,894 INFO L402 BasicCegarLoop]: trace histogram [56, 55, 1, 1] [2018-12-03 18:18:58,894 INFO L423 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:18:58,894 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:18:58,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1945561230, now seen corresponding path program 55 times [2018-12-03 18:18:58,894 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:18:58,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:58,895 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:18:58,895 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:18:58,895 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:18:58,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:00,203 INFO L134 CoverageAnalysis]: Checked inductivity of 3080 backedges. 0 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:00,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:00,203 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:00,203 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:00,203 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:00,203 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:00,204 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 18:19:00,212 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:00,213 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:19:00,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:00,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:01,920 INFO L134 CoverageAnalysis]: Checked inductivity of 3080 backedges. 0 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:01,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:05,682 INFO L134 CoverageAnalysis]: Checked inductivity of 3080 backedges. 0 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:05,700 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:05,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 168 [2018-12-03 18:19:05,701 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:05,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 114 states [2018-12-03 18:19:05,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2018-12-03 18:19:05,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12825, Invalid=15905, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:19:05,703 INFO L87 Difference]: Start difference. First operand 114 states and 114 transitions. Second operand 114 states. [2018-12-03 18:19:05,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:05,973 INFO L93 Difference]: Finished difference Result 117 states and 117 transitions. [2018-12-03 18:19:05,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-12-03 18:19:05,973 INFO L78 Accepts]: Start accepts. Automaton has 114 states. Word has length 113 [2018-12-03 18:19:05,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:05,974 INFO L225 Difference]: With dead ends: 117 [2018-12-03 18:19:05,974 INFO L226 Difference]: Without dead ends: 116 [2018-12-03 18:19:05,976 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12432 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=12825, Invalid=15905, Unknown=0, NotChecked=0, Total=28730 [2018-12-03 18:19:05,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2018-12-03 18:19:05,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2018-12-03 18:19:05,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2018-12-03 18:19:05,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 116 transitions. [2018-12-03 18:19:05,980 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 116 transitions. Word has length 113 [2018-12-03 18:19:05,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:05,980 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 116 transitions. [2018-12-03 18:19:05,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has 114 states. [2018-12-03 18:19:05,981 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 116 transitions. [2018-12-03 18:19:05,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-12-03 18:19:05,981 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:05,981 INFO L402 BasicCegarLoop]: trace histogram [57, 56, 1, 1] [2018-12-03 18:19:05,981 INFO L423 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:05,982 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:05,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1373569360, now seen corresponding path program 56 times [2018-12-03 18:19:05,982 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:05,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:05,983 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:05,983 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:05,983 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:05,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:07,427 INFO L134 CoverageAnalysis]: Checked inductivity of 3192 backedges. 0 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:07,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:07,427 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:07,427 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:07,427 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:07,427 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:07,427 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 18:19:07,436 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:19:07,436 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:19:07,488 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2018-12-03 18:19:07,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:07,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:09,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3192 backedges. 0 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:09,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:13,274 INFO L134 CoverageAnalysis]: Checked inductivity of 3192 backedges. 0 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:13,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:13,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 171 [2018-12-03 18:19:13,293 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:13,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2018-12-03 18:19:13,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2018-12-03 18:19:13,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13282, Invalid=16474, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 18:19:13,296 INFO L87 Difference]: Start difference. First operand 116 states and 116 transitions. Second operand 116 states. [2018-12-03 18:19:13,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:13,612 INFO L93 Difference]: Finished difference Result 119 states and 119 transitions. [2018-12-03 18:19:13,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-12-03 18:19:13,612 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 115 [2018-12-03 18:19:13,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:13,613 INFO L225 Difference]: With dead ends: 119 [2018-12-03 18:19:13,613 INFO L226 Difference]: Without dead ends: 118 [2018-12-03 18:19:13,615 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12882 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=13282, Invalid=16474, Unknown=0, NotChecked=0, Total=29756 [2018-12-03 18:19:13,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2018-12-03 18:19:13,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2018-12-03 18:19:13,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-12-03 18:19:13,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 118 transitions. [2018-12-03 18:19:13,618 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 118 transitions. Word has length 115 [2018-12-03 18:19:13,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:13,618 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 118 transitions. [2018-12-03 18:19:13,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has 116 states. [2018-12-03 18:19:13,619 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 118 transitions. [2018-12-03 18:19:13,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-12-03 18:19:13,619 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:13,619 INFO L402 BasicCegarLoop]: trace histogram [58, 57, 1, 1] [2018-12-03 18:19:13,620 INFO L423 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:13,620 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:13,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1445196178, now seen corresponding path program 57 times [2018-12-03 18:19:13,620 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:13,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:13,621 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:13,621 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:13,621 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:13,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:15,334 INFO L134 CoverageAnalysis]: Checked inductivity of 3306 backedges. 0 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:15,334 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:15,334 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:15,335 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:15,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:15,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:15,335 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 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 18:19:15,343 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:19:15,343 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:19:15,376 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:19:15,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:15,379 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:17,243 INFO L134 CoverageAnalysis]: Checked inductivity of 3306 backedges. 0 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:17,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:21,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3306 backedges. 0 proven. 3306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:21,438 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:21,438 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 174 [2018-12-03 18:19:21,438 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:21,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 118 states [2018-12-03 18:19:21,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2018-12-03 18:19:21,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13747, Invalid=17053, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 18:19:21,441 INFO L87 Difference]: Start difference. First operand 118 states and 118 transitions. Second operand 118 states. [2018-12-03 18:19:21,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:21,710 INFO L93 Difference]: Finished difference Result 121 states and 121 transitions. [2018-12-03 18:19:21,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2018-12-03 18:19:21,710 INFO L78 Accepts]: Start accepts. Automaton has 118 states. Word has length 117 [2018-12-03 18:19:21,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:21,711 INFO L225 Difference]: With dead ends: 121 [2018-12-03 18:19:21,711 INFO L226 Difference]: Without dead ends: 120 [2018-12-03 18:19:21,713 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13340 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=13747, Invalid=17053, Unknown=0, NotChecked=0, Total=30800 [2018-12-03 18:19:21,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-12-03 18:19:21,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2018-12-03 18:19:21,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-12-03 18:19:21,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 120 transitions. [2018-12-03 18:19:21,717 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 120 transitions. Word has length 117 [2018-12-03 18:19:21,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:21,717 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 120 transitions. [2018-12-03 18:19:21,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has 118 states. [2018-12-03 18:19:21,717 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 120 transitions. [2018-12-03 18:19:21,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-12-03 18:19:21,717 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:21,718 INFO L402 BasicCegarLoop]: trace histogram [59, 58, 1, 1] [2018-12-03 18:19:21,718 INFO L423 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:21,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:21,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1559091540, now seen corresponding path program 58 times [2018-12-03 18:19:21,718 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:21,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:21,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:21,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:21,719 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:21,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:23,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3422 backedges. 0 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:23,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:23,189 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:23,189 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:23,189 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:23,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:23,190 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 18:19:23,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:23,199 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:19:23,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:23,230 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:25,464 INFO L134 CoverageAnalysis]: Checked inductivity of 3422 backedges. 0 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:25,464 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:29,757 INFO L134 CoverageAnalysis]: Checked inductivity of 3422 backedges. 0 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:29,777 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:29,777 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 177 [2018-12-03 18:19:29,777 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:29,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 120 states [2018-12-03 18:19:29,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2018-12-03 18:19:29,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14220, Invalid=17642, Unknown=0, NotChecked=0, Total=31862 [2018-12-03 18:19:29,780 INFO L87 Difference]: Start difference. First operand 120 states and 120 transitions. Second operand 120 states. [2018-12-03 18:19:30,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:30,052 INFO L93 Difference]: Finished difference Result 123 states and 123 transitions. [2018-12-03 18:19:30,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-12-03 18:19:30,052 INFO L78 Accepts]: Start accepts. Automaton has 120 states. Word has length 119 [2018-12-03 18:19:30,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:30,053 INFO L225 Difference]: With dead ends: 123 [2018-12-03 18:19:30,053 INFO L226 Difference]: Without dead ends: 122 [2018-12-03 18:19:30,054 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13806 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=14220, Invalid=17642, Unknown=0, NotChecked=0, Total=31862 [2018-12-03 18:19:30,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-12-03 18:19:30,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2018-12-03 18:19:30,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-12-03 18:19:30,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 122 transitions. [2018-12-03 18:19:30,058 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 122 transitions. Word has length 119 [2018-12-03 18:19:30,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:30,058 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 122 transitions. [2018-12-03 18:19:30,058 INFO L481 AbstractCegarLoop]: Interpolant automaton has 120 states. [2018-12-03 18:19:30,058 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 122 transitions. [2018-12-03 18:19:30,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-12-03 18:19:30,059 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:30,059 INFO L402 BasicCegarLoop]: trace histogram [60, 59, 1, 1] [2018-12-03 18:19:30,059 INFO L423 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:30,059 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:30,060 INFO L82 PathProgramCache]: Analyzing trace with hash -656615274, now seen corresponding path program 59 times [2018-12-03 18:19:30,060 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:30,060 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:30,061 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:30,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:30,061 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:30,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:31,615 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:31,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:31,616 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:31,616 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:31,616 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:31,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:31,616 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 18:19:31,626 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:19:31,626 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:19:31,682 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2018-12-03 18:19:31,682 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:31,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:33,704 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:33,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:38,130 INFO L134 CoverageAnalysis]: Checked inductivity of 3540 backedges. 0 proven. 3540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:38,150 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:38,150 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 180 [2018-12-03 18:19:38,150 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:38,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2018-12-03 18:19:38,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2018-12-03 18:19:38,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14701, Invalid=18241, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:19:38,152 INFO L87 Difference]: Start difference. First operand 122 states and 122 transitions. Second operand 122 states. [2018-12-03 18:19:38,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:38,690 INFO L93 Difference]: Finished difference Result 125 states and 125 transitions. [2018-12-03 18:19:38,691 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2018-12-03 18:19:38,691 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 121 [2018-12-03 18:19:38,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:38,692 INFO L225 Difference]: With dead ends: 125 [2018-12-03 18:19:38,692 INFO L226 Difference]: Without dead ends: 124 [2018-12-03 18:19:38,693 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14280 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=14701, Invalid=18241, Unknown=0, NotChecked=0, Total=32942 [2018-12-03 18:19:38,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2018-12-03 18:19:38,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2018-12-03 18:19:38,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-12-03 18:19:38,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 124 transitions. [2018-12-03 18:19:38,697 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 124 transitions. Word has length 121 [2018-12-03 18:19:38,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:38,697 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 124 transitions. [2018-12-03 18:19:38,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has 122 states. [2018-12-03 18:19:38,698 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 124 transitions. [2018-12-03 18:19:38,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-12-03 18:19:38,698 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:38,699 INFO L402 BasicCegarLoop]: trace histogram [61, 60, 1, 1] [2018-12-03 18:19:38,699 INFO L423 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:38,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:38,699 INFO L82 PathProgramCache]: Analyzing trace with hash 352915288, now seen corresponding path program 60 times [2018-12-03 18:19:38,699 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:38,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:38,700 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:38,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:38,700 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:38,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:40,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3660 backedges. 0 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:40,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:40,697 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:40,697 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:40,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:40,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:40,698 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 18:19:40,707 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:19:40,707 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:19:40,741 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:19:40,742 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:40,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:42,710 INFO L134 CoverageAnalysis]: Checked inductivity of 3660 backedges. 0 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:42,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:47,366 INFO L134 CoverageAnalysis]: Checked inductivity of 3660 backedges. 0 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:47,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:47,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 183 [2018-12-03 18:19:47,406 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:47,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 124 states [2018-12-03 18:19:47,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2018-12-03 18:19:47,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15190, Invalid=18850, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 18:19:47,408 INFO L87 Difference]: Start difference. First operand 124 states and 124 transitions. Second operand 124 states. [2018-12-03 18:19:47,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:47,678 INFO L93 Difference]: Finished difference Result 127 states and 127 transitions. [2018-12-03 18:19:47,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-12-03 18:19:47,678 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 123 [2018-12-03 18:19:47,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:47,679 INFO L225 Difference]: With dead ends: 127 [2018-12-03 18:19:47,680 INFO L226 Difference]: Without dead ends: 126 [2018-12-03 18:19:47,681 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14762 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=15190, Invalid=18850, Unknown=0, NotChecked=0, Total=34040 [2018-12-03 18:19:47,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-12-03 18:19:47,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2018-12-03 18:19:47,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2018-12-03 18:19:47,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 126 transitions. [2018-12-03 18:19:47,686 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 126 transitions. Word has length 123 [2018-12-03 18:19:47,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:47,686 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 126 transitions. [2018-12-03 18:19:47,686 INFO L481 AbstractCegarLoop]: Interpolant automaton has 124 states. [2018-12-03 18:19:47,686 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 126 transitions. [2018-12-03 18:19:47,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-12-03 18:19:47,687 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:47,687 INFO L402 BasicCegarLoop]: trace histogram [62, 61, 1, 1] [2018-12-03 18:19:47,687 INFO L423 AbstractCegarLoop]: === Iteration 62 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:47,687 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:47,688 INFO L82 PathProgramCache]: Analyzing trace with hash -150823526, now seen corresponding path program 61 times [2018-12-03 18:19:47,688 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:47,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:47,688 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:19:47,688 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:47,689 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:47,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:49,301 INFO L134 CoverageAnalysis]: Checked inductivity of 3782 backedges. 0 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:49,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:49,302 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:49,302 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:49,302 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:49,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:49,302 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 18:19:49,311 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:49,311 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:19:49,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:49,346 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:19:51,569 INFO L134 CoverageAnalysis]: Checked inductivity of 3782 backedges. 0 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:51,570 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:19:56,436 INFO L134 CoverageAnalysis]: Checked inductivity of 3782 backedges. 0 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:56,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:19:56,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 186 [2018-12-03 18:19:56,455 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:19:56,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 126 states [2018-12-03 18:19:56,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2018-12-03 18:19:56,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15687, Invalid=19469, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 18:19:56,457 INFO L87 Difference]: Start difference. First operand 126 states and 126 transitions. Second operand 126 states. [2018-12-03 18:19:56,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:19:56,753 INFO L93 Difference]: Finished difference Result 129 states and 129 transitions. [2018-12-03 18:19:56,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2018-12-03 18:19:56,753 INFO L78 Accepts]: Start accepts. Automaton has 126 states. Word has length 125 [2018-12-03 18:19:56,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:19:56,754 INFO L225 Difference]: With dead ends: 129 [2018-12-03 18:19:56,754 INFO L226 Difference]: Without dead ends: 128 [2018-12-03 18:19:56,755 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15252 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=15687, Invalid=19469, Unknown=0, NotChecked=0, Total=35156 [2018-12-03 18:19:56,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-12-03 18:19:56,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2018-12-03 18:19:56,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2018-12-03 18:19:56,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 128 transitions. [2018-12-03 18:19:56,760 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 128 transitions. Word has length 125 [2018-12-03 18:19:56,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:19:56,761 INFO L480 AbstractCegarLoop]: Abstraction has 128 states and 128 transitions. [2018-12-03 18:19:56,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has 126 states. [2018-12-03 18:19:56,761 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 128 transitions. [2018-12-03 18:19:56,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2018-12-03 18:19:56,761 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:19:56,761 INFO L402 BasicCegarLoop]: trace histogram [63, 62, 1, 1] [2018-12-03 18:19:56,762 INFO L423 AbstractCegarLoop]: === Iteration 63 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:19:56,762 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:19:56,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1087480668, now seen corresponding path program 62 times [2018-12-03 18:19:56,762 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:19:56,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:56,763 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:19:56,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:19:56,763 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:19:56,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:19:59,485 INFO L134 CoverageAnalysis]: Checked inductivity of 3906 backedges. 0 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:19:59,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:59,486 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:19:59,486 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:19:59,486 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:19:59,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:19:59,486 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 18:19:59,496 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:19:59,496 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:19:59,558 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2018-12-03 18:19:59,559 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:19:59,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:02,034 INFO L134 CoverageAnalysis]: Checked inductivity of 3906 backedges. 0 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:02,034 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:06,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3906 backedges. 0 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:06,976 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:06,976 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 189 [2018-12-03 18:20:06,976 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:06,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2018-12-03 18:20:06,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2018-12-03 18:20:06,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16192, Invalid=20098, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 18:20:06,979 INFO L87 Difference]: Start difference. First operand 128 states and 128 transitions. Second operand 128 states. [2018-12-03 18:20:07,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:07,299 INFO L93 Difference]: Finished difference Result 131 states and 131 transitions. [2018-12-03 18:20:07,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-12-03 18:20:07,300 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 127 [2018-12-03 18:20:07,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:07,301 INFO L225 Difference]: With dead ends: 131 [2018-12-03 18:20:07,301 INFO L226 Difference]: Without dead ends: 130 [2018-12-03 18:20:07,302 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15750 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=16192, Invalid=20098, Unknown=0, NotChecked=0, Total=36290 [2018-12-03 18:20:07,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2018-12-03 18:20:07,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2018-12-03 18:20:07,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-12-03 18:20:07,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 130 transitions. [2018-12-03 18:20:07,307 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 130 transitions. Word has length 127 [2018-12-03 18:20:07,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:07,307 INFO L480 AbstractCegarLoop]: Abstraction has 130 states and 130 transitions. [2018-12-03 18:20:07,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has 128 states. [2018-12-03 18:20:07,307 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 130 transitions. [2018-12-03 18:20:07,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-12-03 18:20:07,308 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:07,308 INFO L402 BasicCegarLoop]: trace histogram [64, 63, 1, 1] [2018-12-03 18:20:07,308 INFO L423 AbstractCegarLoop]: === Iteration 64 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:07,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:07,308 INFO L82 PathProgramCache]: Analyzing trace with hash 1391870110, now seen corresponding path program 63 times [2018-12-03 18:20:07,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:07,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:07,309 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:07,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:07,309 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:07,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:09,782 INFO L134 CoverageAnalysis]: Checked inductivity of 4032 backedges. 0 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:09,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:09,782 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:09,782 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:09,782 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:09,782 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:09,782 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 18:20:09,793 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:20:09,793 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:20:09,828 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:20:09,828 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:09,831 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:12,313 INFO L134 CoverageAnalysis]: Checked inductivity of 4032 backedges. 0 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:12,314 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:17,318 INFO L134 CoverageAnalysis]: Checked inductivity of 4032 backedges. 0 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:17,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:17,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 192 [2018-12-03 18:20:17,337 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:17,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 130 states [2018-12-03 18:20:17,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 130 interpolants. [2018-12-03 18:20:17,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16705, Invalid=20737, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:20:17,341 INFO L87 Difference]: Start difference. First operand 130 states and 130 transitions. Second operand 130 states. [2018-12-03 18:20:17,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:17,719 INFO L93 Difference]: Finished difference Result 133 states and 133 transitions. [2018-12-03 18:20:17,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-12-03 18:20:17,719 INFO L78 Accepts]: Start accepts. Automaton has 130 states. Word has length 129 [2018-12-03 18:20:17,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:17,720 INFO L225 Difference]: With dead ends: 133 [2018-12-03 18:20:17,721 INFO L226 Difference]: Without dead ends: 132 [2018-12-03 18:20:17,723 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16256 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=16705, Invalid=20737, Unknown=0, NotChecked=0, Total=37442 [2018-12-03 18:20:17,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2018-12-03 18:20:17,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2018-12-03 18:20:17,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2018-12-03 18:20:17,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 132 transitions. [2018-12-03 18:20:17,728 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 132 transitions. Word has length 129 [2018-12-03 18:20:17,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:17,728 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 132 transitions. [2018-12-03 18:20:17,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has 130 states. [2018-12-03 18:20:17,728 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 132 transitions. [2018-12-03 18:20:17,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-12-03 18:20:17,729 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:17,729 INFO L402 BasicCegarLoop]: trace histogram [65, 64, 1, 1] [2018-12-03 18:20:17,729 INFO L423 AbstractCegarLoop]: === Iteration 65 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:17,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:17,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1852347744, now seen corresponding path program 64 times [2018-12-03 18:20:17,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:17,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:17,731 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:17,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:17,731 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:17,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:19,540 INFO L134 CoverageAnalysis]: Checked inductivity of 4160 backedges. 0 proven. 4160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:19,540 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:19,540 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:19,541 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:19,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:19,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:19,541 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 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 18:20:19,552 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:19,553 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:20:19,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:19,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:22,110 INFO L134 CoverageAnalysis]: Checked inductivity of 4160 backedges. 0 proven. 4160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:22,110 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:27,323 INFO L134 CoverageAnalysis]: Checked inductivity of 4160 backedges. 0 proven. 4160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:27,344 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:27,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 195 [2018-12-03 18:20:27,344 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:27,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2018-12-03 18:20:27,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2018-12-03 18:20:27,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17226, Invalid=21386, Unknown=0, NotChecked=0, Total=38612 [2018-12-03 18:20:27,347 INFO L87 Difference]: Start difference. First operand 132 states and 132 transitions. Second operand 132 states. [2018-12-03 18:20:27,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:27,662 INFO L93 Difference]: Finished difference Result 135 states and 135 transitions. [2018-12-03 18:20:27,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-12-03 18:20:27,662 INFO L78 Accepts]: Start accepts. Automaton has 132 states. Word has length 131 [2018-12-03 18:20:27,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:27,663 INFO L225 Difference]: With dead ends: 135 [2018-12-03 18:20:27,663 INFO L226 Difference]: Without dead ends: 134 [2018-12-03 18:20:27,664 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16770 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=17226, Invalid=21386, Unknown=0, NotChecked=0, Total=38612 [2018-12-03 18:20:27,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2018-12-03 18:20:27,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2018-12-03 18:20:27,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2018-12-03 18:20:27,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 134 transitions. [2018-12-03 18:20:27,668 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 134 transitions. Word has length 131 [2018-12-03 18:20:27,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:27,669 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 134 transitions. [2018-12-03 18:20:27,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has 132 states. [2018-12-03 18:20:27,669 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 134 transitions. [2018-12-03 18:20:27,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2018-12-03 18:20:27,669 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:27,669 INFO L402 BasicCegarLoop]: trace histogram [66, 65, 1, 1] [2018-12-03 18:20:27,670 INFO L423 AbstractCegarLoop]: === Iteration 66 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:27,670 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:27,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1989722530, now seen corresponding path program 65 times [2018-12-03 18:20:27,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:27,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:27,671 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:27,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:27,671 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:27,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:29,694 INFO L134 CoverageAnalysis]: Checked inductivity of 4290 backedges. 0 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:29,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:29,695 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:29,695 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:29,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:29,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:29,695 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 18:20:29,705 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:20:29,705 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:20:29,776 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2018-12-03 18:20:29,776 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:29,779 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:32,783 INFO L134 CoverageAnalysis]: Checked inductivity of 4290 backedges. 0 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:32,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:38,216 INFO L134 CoverageAnalysis]: Checked inductivity of 4290 backedges. 0 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:38,235 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:38,236 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 198 [2018-12-03 18:20:38,236 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:38,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2018-12-03 18:20:38,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2018-12-03 18:20:38,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17755, Invalid=22045, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 18:20:38,239 INFO L87 Difference]: Start difference. First operand 134 states and 134 transitions. Second operand 134 states. [2018-12-03 18:20:38,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:38,571 INFO L93 Difference]: Finished difference Result 137 states and 137 transitions. [2018-12-03 18:20:38,571 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-12-03 18:20:38,571 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 133 [2018-12-03 18:20:38,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:38,572 INFO L225 Difference]: With dead ends: 137 [2018-12-03 18:20:38,572 INFO L226 Difference]: Without dead ends: 136 [2018-12-03 18:20:38,573 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17292 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=17755, Invalid=22045, Unknown=0, NotChecked=0, Total=39800 [2018-12-03 18:20:38,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2018-12-03 18:20:38,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2018-12-03 18:20:38,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2018-12-03 18:20:38,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 136 transitions. [2018-12-03 18:20:38,578 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 136 transitions. Word has length 133 [2018-12-03 18:20:38,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:38,578 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 136 transitions. [2018-12-03 18:20:38,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has 134 states. [2018-12-03 18:20:38,578 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 136 transitions. [2018-12-03 18:20:38,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-12-03 18:20:38,579 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:38,579 INFO L402 BasicCegarLoop]: trace histogram [67, 66, 1, 1] [2018-12-03 18:20:38,579 INFO L423 AbstractCegarLoop]: === Iteration 67 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:38,579 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:38,579 INFO L82 PathProgramCache]: Analyzing trace with hash 862905700, now seen corresponding path program 66 times [2018-12-03 18:20:38,579 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:38,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:38,580 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:38,580 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:38,580 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:38,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:40,549 INFO L134 CoverageAnalysis]: Checked inductivity of 4422 backedges. 0 proven. 4422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:40,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:40,549 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:40,549 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:40,549 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:40,549 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:40,550 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 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 18:20:40,560 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:20:40,560 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:20:40,598 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:20:40,598 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:20:40,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:43,244 INFO L134 CoverageAnalysis]: Checked inductivity of 4422 backedges. 0 proven. 4422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:43,244 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:48,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4422 backedges. 0 proven. 4422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:48,714 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:48,714 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 201 [2018-12-03 18:20:48,714 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:48,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 136 states [2018-12-03 18:20:48,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2018-12-03 18:20:48,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18292, Invalid=22714, Unknown=0, NotChecked=0, Total=41006 [2018-12-03 18:20:48,717 INFO L87 Difference]: Start difference. First operand 136 states and 136 transitions. Second operand 136 states. [2018-12-03 18:20:49,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:49,123 INFO L93 Difference]: Finished difference Result 139 states and 139 transitions. [2018-12-03 18:20:49,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-12-03 18:20:49,124 INFO L78 Accepts]: Start accepts. Automaton has 136 states. Word has length 135 [2018-12-03 18:20:49,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:49,125 INFO L225 Difference]: With dead ends: 139 [2018-12-03 18:20:49,125 INFO L226 Difference]: Without dead ends: 138 [2018-12-03 18:20:49,127 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 335 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 201 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17822 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=18292, Invalid=22714, Unknown=0, NotChecked=0, Total=41006 [2018-12-03 18:20:49,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-12-03 18:20:49,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2018-12-03 18:20:49,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2018-12-03 18:20:49,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 138 transitions. [2018-12-03 18:20:49,131 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 138 transitions. Word has length 135 [2018-12-03 18:20:49,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:49,131 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 138 transitions. [2018-12-03 18:20:49,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has 136 states. [2018-12-03 18:20:49,131 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 138 transitions. [2018-12-03 18:20:49,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2018-12-03 18:20:49,132 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:49,132 INFO L402 BasicCegarLoop]: trace histogram [68, 67, 1, 1] [2018-12-03 18:20:49,132 INFO L423 AbstractCegarLoop]: === Iteration 68 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:49,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:49,132 INFO L82 PathProgramCache]: Analyzing trace with hash 323690662, now seen corresponding path program 67 times [2018-12-03 18:20:49,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:49,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:49,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:20:49,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:49,133 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:49,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:51,105 INFO L134 CoverageAnalysis]: Checked inductivity of 4556 backedges. 0 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:51,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:51,106 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:20:51,106 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:20:51,106 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:20:51,106 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:20:51,106 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 18:20:51,115 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:51,115 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:20:51,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:20:51,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:20:53,892 INFO L134 CoverageAnalysis]: Checked inductivity of 4556 backedges. 0 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:53,892 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:20:59,587 INFO L134 CoverageAnalysis]: Checked inductivity of 4556 backedges. 0 proven. 4556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:20:59,606 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:20:59,606 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 204 [2018-12-03 18:20:59,606 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:20:59,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 138 states [2018-12-03 18:20:59,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 138 interpolants. [2018-12-03 18:20:59,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18837, Invalid=23393, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:20:59,609 INFO L87 Difference]: Start difference. First operand 138 states and 138 transitions. Second operand 138 states. [2018-12-03 18:20:59,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:20:59,969 INFO L93 Difference]: Finished difference Result 141 states and 141 transitions. [2018-12-03 18:20:59,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2018-12-03 18:20:59,970 INFO L78 Accepts]: Start accepts. Automaton has 138 states. Word has length 137 [2018-12-03 18:20:59,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:20:59,971 INFO L225 Difference]: With dead ends: 141 [2018-12-03 18:20:59,971 INFO L226 Difference]: Without dead ends: 140 [2018-12-03 18:20:59,972 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18360 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=18837, Invalid=23393, Unknown=0, NotChecked=0, Total=42230 [2018-12-03 18:20:59,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2018-12-03 18:20:59,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2018-12-03 18:20:59,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2018-12-03 18:20:59,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2018-12-03 18:20:59,976 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 137 [2018-12-03 18:20:59,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:20:59,976 INFO L480 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2018-12-03 18:20:59,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has 138 states. [2018-12-03 18:20:59,976 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2018-12-03 18:20:59,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2018-12-03 18:20:59,977 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:20:59,977 INFO L402 BasicCegarLoop]: trace histogram [69, 68, 1, 1] [2018-12-03 18:20:59,977 INFO L423 AbstractCegarLoop]: === Iteration 69 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:20:59,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:20:59,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1829081960, now seen corresponding path program 68 times [2018-12-03 18:20:59,977 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:20:59,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:59,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:20:59,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:20:59,978 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:20:59,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:02,177 INFO L134 CoverageAnalysis]: Checked inductivity of 4692 backedges. 0 proven. 4692 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:02,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:02,177 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:02,177 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:02,177 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:02,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:02,177 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 18:21:02,186 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:21:02,187 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:21:02,256 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-12-03 18:21:02,257 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:02,259 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:04,857 INFO L134 CoverageAnalysis]: Checked inductivity of 4692 backedges. 0 proven. 4692 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:04,857 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:10,591 INFO L134 CoverageAnalysis]: Checked inductivity of 4692 backedges. 0 proven. 4692 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:10,610 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:10,610 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 207 [2018-12-03 18:21:10,610 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:10,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2018-12-03 18:21:10,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2018-12-03 18:21:10,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19390, Invalid=24082, Unknown=0, NotChecked=0, Total=43472 [2018-12-03 18:21:10,613 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 140 states. [2018-12-03 18:21:10,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:10,948 INFO L93 Difference]: Finished difference Result 143 states and 143 transitions. [2018-12-03 18:21:10,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-12-03 18:21:10,948 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 139 [2018-12-03 18:21:10,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:10,949 INFO L225 Difference]: With dead ends: 143 [2018-12-03 18:21:10,949 INFO L226 Difference]: Without dead ends: 142 [2018-12-03 18:21:10,951 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18906 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=19390, Invalid=24082, Unknown=0, NotChecked=0, Total=43472 [2018-12-03 18:21:10,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2018-12-03 18:21:10,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2018-12-03 18:21:10,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-12-03 18:21:10,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 142 transitions. [2018-12-03 18:21:10,955 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 142 transitions. Word has length 139 [2018-12-03 18:21:10,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:10,955 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 142 transitions. [2018-12-03 18:21:10,955 INFO L481 AbstractCegarLoop]: Interpolant automaton has 140 states. [2018-12-03 18:21:10,955 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 142 transitions. [2018-12-03 18:21:10,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-12-03 18:21:10,956 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:10,956 INFO L402 BasicCegarLoop]: trace histogram [70, 69, 1, 1] [2018-12-03 18:21:10,956 INFO L423 AbstractCegarLoop]: === Iteration 70 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:10,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:10,956 INFO L82 PathProgramCache]: Analyzing trace with hash 1106140586, now seen corresponding path program 69 times [2018-12-03 18:21:10,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:10,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:10,957 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:10,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:10,957 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:10,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:13,358 INFO L134 CoverageAnalysis]: Checked inductivity of 4830 backedges. 0 proven. 4830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:13,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:13,358 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:13,358 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:13,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:13,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:13,359 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 18:21:13,366 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:21:13,367 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:21:13,407 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:21:13,407 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:13,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:15,986 INFO L134 CoverageAnalysis]: Checked inductivity of 4830 backedges. 0 proven. 4830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:15,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:22,090 INFO L134 CoverageAnalysis]: Checked inductivity of 4830 backedges. 0 proven. 4830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:22,109 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:22,109 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 210 [2018-12-03 18:21:22,109 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:22,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 142 states [2018-12-03 18:21:22,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2018-12-03 18:21:22,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19951, Invalid=24781, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 18:21:22,112 INFO L87 Difference]: Start difference. First operand 142 states and 142 transitions. Second operand 142 states. [2018-12-03 18:21:22,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:22,583 INFO L93 Difference]: Finished difference Result 145 states and 145 transitions. [2018-12-03 18:21:22,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2018-12-03 18:21:22,584 INFO L78 Accepts]: Start accepts. Automaton has 142 states. Word has length 141 [2018-12-03 18:21:22,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:22,585 INFO L225 Difference]: With dead ends: 145 [2018-12-03 18:21:22,585 INFO L226 Difference]: Without dead ends: 144 [2018-12-03 18:21:22,586 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19460 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=19951, Invalid=24781, Unknown=0, NotChecked=0, Total=44732 [2018-12-03 18:21:22,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2018-12-03 18:21:22,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2018-12-03 18:21:22,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-12-03 18:21:22,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 144 transitions. [2018-12-03 18:21:22,590 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 144 transitions. Word has length 141 [2018-12-03 18:21:22,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:22,591 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 144 transitions. [2018-12-03 18:21:22,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has 142 states. [2018-12-03 18:21:22,591 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 144 transitions. [2018-12-03 18:21:22,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-12-03 18:21:22,591 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:22,592 INFO L402 BasicCegarLoop]: trace histogram [71, 70, 1, 1] [2018-12-03 18:21:22,592 INFO L423 AbstractCegarLoop]: === Iteration 71 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:22,592 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:22,592 INFO L82 PathProgramCache]: Analyzing trace with hash 2144182124, now seen corresponding path program 70 times [2018-12-03 18:21:22,592 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:22,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:22,593 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:22,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:22,593 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:22,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:24,827 INFO L134 CoverageAnalysis]: Checked inductivity of 4970 backedges. 0 proven. 4970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:24,827 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:24,827 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:24,828 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:24,828 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:24,828 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:24,828 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:21:24,837 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:21:24,837 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:21:24,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:24,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:27,744 INFO L134 CoverageAnalysis]: Checked inductivity of 4970 backedges. 0 proven. 4970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:27,745 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:33,887 INFO L134 CoverageAnalysis]: Checked inductivity of 4970 backedges. 0 proven. 4970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:33,908 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:33,908 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 213 [2018-12-03 18:21:33,909 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:33,909 INFO L459 AbstractCegarLoop]: Interpolant automaton has 144 states [2018-12-03 18:21:33,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 144 interpolants. [2018-12-03 18:21:33,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20520, Invalid=25490, Unknown=0, NotChecked=0, Total=46010 [2018-12-03 18:21:33,912 INFO L87 Difference]: Start difference. First operand 144 states and 144 transitions. Second operand 144 states. [2018-12-03 18:21:34,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:34,303 INFO L93 Difference]: Finished difference Result 147 states and 147 transitions. [2018-12-03 18:21:34,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-12-03 18:21:34,304 INFO L78 Accepts]: Start accepts. Automaton has 144 states. Word has length 143 [2018-12-03 18:21:34,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:34,305 INFO L225 Difference]: With dead ends: 147 [2018-12-03 18:21:34,305 INFO L226 Difference]: Without dead ends: 146 [2018-12-03 18:21:34,307 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 213 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20022 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=20520, Invalid=25490, Unknown=0, NotChecked=0, Total=46010 [2018-12-03 18:21:34,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2018-12-03 18:21:34,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2018-12-03 18:21:34,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-12-03 18:21:34,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 146 transitions. [2018-12-03 18:21:34,311 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 146 transitions. Word has length 143 [2018-12-03 18:21:34,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:34,311 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 146 transitions. [2018-12-03 18:21:34,311 INFO L481 AbstractCegarLoop]: Interpolant automaton has 144 states. [2018-12-03 18:21:34,311 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 146 transitions. [2018-12-03 18:21:34,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2018-12-03 18:21:34,312 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:34,312 INFO L402 BasicCegarLoop]: trace histogram [72, 71, 1, 1] [2018-12-03 18:21:34,312 INFO L423 AbstractCegarLoop]: === Iteration 72 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:34,312 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:34,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1025279826, now seen corresponding path program 71 times [2018-12-03 18:21:34,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:34,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:34,313 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:21:34,313 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:34,314 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:34,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:36,522 INFO L134 CoverageAnalysis]: Checked inductivity of 5112 backedges. 0 proven. 5112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:36,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:36,523 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:36,523 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:36,523 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:36,523 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:36,523 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:21:36,532 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:21:36,532 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:21:36,723 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 72 check-sat command(s) [2018-12-03 18:21:36,723 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:36,727 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:39,881 INFO L134 CoverageAnalysis]: Checked inductivity of 5112 backedges. 0 proven. 5112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:39,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:46,201 INFO L134 CoverageAnalysis]: Checked inductivity of 5112 backedges. 0 proven. 5112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:46,222 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:46,222 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 216 [2018-12-03 18:21:46,223 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:46,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2018-12-03 18:21:46,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2018-12-03 18:21:46,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21097, Invalid=26209, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:21:46,226 INFO L87 Difference]: Start difference. First operand 146 states and 146 transitions. Second operand 146 states. [2018-12-03 18:21:46,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:46,695 INFO L93 Difference]: Finished difference Result 149 states and 149 transitions. [2018-12-03 18:21:46,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2018-12-03 18:21:46,695 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 145 [2018-12-03 18:21:46,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:46,697 INFO L225 Difference]: With dead ends: 149 [2018-12-03 18:21:46,697 INFO L226 Difference]: Without dead ends: 148 [2018-12-03 18:21:46,699 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20592 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=21097, Invalid=26209, Unknown=0, NotChecked=0, Total=47306 [2018-12-03 18:21:46,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-12-03 18:21:46,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2018-12-03 18:21:46,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2018-12-03 18:21:46,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 148 transitions. [2018-12-03 18:21:46,703 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 148 transitions. Word has length 145 [2018-12-03 18:21:46,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:46,704 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 148 transitions. [2018-12-03 18:21:46,704 INFO L481 AbstractCegarLoop]: Interpolant automaton has 146 states. [2018-12-03 18:21:46,704 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 148 transitions. [2018-12-03 18:21:46,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2018-12-03 18:21:46,705 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:46,705 INFO L402 BasicCegarLoop]: trace histogram [73, 72, 1, 1] [2018-12-03 18:21:46,705 INFO L423 AbstractCegarLoop]: === Iteration 73 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:46,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:46,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1746400912, now seen corresponding path program 72 times [2018-12-03 18:21:46,706 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:46,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:46,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:46,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:46,707 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:46,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:21:49,182 INFO L134 CoverageAnalysis]: Checked inductivity of 5256 backedges. 0 proven. 5256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:49,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:49,183 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:21:49,183 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:21:49,183 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:21:49,183 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:21:49,183 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 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 18:21:49,192 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:21:49,192 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:21:49,230 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:21:49,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:21:49,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:21:52,133 INFO L134 CoverageAnalysis]: Checked inductivity of 5256 backedges. 0 proven. 5256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:52,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:21:58,834 INFO L134 CoverageAnalysis]: Checked inductivity of 5256 backedges. 0 proven. 5256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:21:58,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:21:58,855 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 219 [2018-12-03 18:21:58,855 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:21:58,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 148 states [2018-12-03 18:21:58,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2018-12-03 18:21:58,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21682, Invalid=26938, Unknown=0, NotChecked=0, Total=48620 [2018-12-03 18:21:58,860 INFO L87 Difference]: Start difference. First operand 148 states and 148 transitions. Second operand 148 states. [2018-12-03 18:21:59,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:21:59,358 INFO L93 Difference]: Finished difference Result 151 states and 151 transitions. [2018-12-03 18:21:59,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-12-03 18:21:59,358 INFO L78 Accepts]: Start accepts. Automaton has 148 states. Word has length 147 [2018-12-03 18:21:59,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:21:59,360 INFO L225 Difference]: With dead ends: 151 [2018-12-03 18:21:59,360 INFO L226 Difference]: Without dead ends: 150 [2018-12-03 18:21:59,362 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 365 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21170 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=21682, Invalid=26938, Unknown=0, NotChecked=0, Total=48620 [2018-12-03 18:21:59,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2018-12-03 18:21:59,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2018-12-03 18:21:59,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-12-03 18:21:59,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 150 transitions. [2018-12-03 18:21:59,368 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 150 transitions. Word has length 147 [2018-12-03 18:21:59,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:21:59,368 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 150 transitions. [2018-12-03 18:21:59,368 INFO L481 AbstractCegarLoop]: Interpolant automaton has 148 states. [2018-12-03 18:21:59,368 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 150 transitions. [2018-12-03 18:21:59,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2018-12-03 18:21:59,369 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:21:59,369 INFO L402 BasicCegarLoop]: trace histogram [74, 73, 1, 1] [2018-12-03 18:21:59,369 INFO L423 AbstractCegarLoop]: === Iteration 74 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:21:59,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:21:59,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1040937394, now seen corresponding path program 73 times [2018-12-03 18:21:59,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:21:59,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:59,371 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:21:59,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:21:59,371 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:21:59,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:01,681 INFO L134 CoverageAnalysis]: Checked inductivity of 5402 backedges. 0 proven. 5402 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:01,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:01,681 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:01,681 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:01,681 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:01,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:01,681 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 18:22:01,691 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:01,691 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:22:01,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:01,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:04,873 INFO L134 CoverageAnalysis]: Checked inductivity of 5402 backedges. 0 proven. 5402 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:04,873 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:11,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5402 backedges. 0 proven. 5402 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:11,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:11,420 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74, 74] total 222 [2018-12-03 18:22:11,420 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:11,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 150 states [2018-12-03 18:22:11,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 150 interpolants. [2018-12-03 18:22:11,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22275, Invalid=27677, Unknown=0, NotChecked=0, Total=49952 [2018-12-03 18:22:11,423 INFO L87 Difference]: Start difference. First operand 150 states and 150 transitions. Second operand 150 states. [2018-12-03 18:22:11,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:11,851 INFO L93 Difference]: Finished difference Result 153 states and 153 transitions. [2018-12-03 18:22:11,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2018-12-03 18:22:11,852 INFO L78 Accepts]: Start accepts. Automaton has 150 states. Word has length 149 [2018-12-03 18:22:11,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:11,853 INFO L225 Difference]: With dead ends: 153 [2018-12-03 18:22:11,853 INFO L226 Difference]: Without dead ends: 152 [2018-12-03 18:22:11,854 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21756 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=22275, Invalid=27677, Unknown=0, NotChecked=0, Total=49952 [2018-12-03 18:22:11,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-12-03 18:22:11,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2018-12-03 18:22:11,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2018-12-03 18:22:11,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 152 transitions. [2018-12-03 18:22:11,859 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 152 transitions. Word has length 149 [2018-12-03 18:22:11,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:11,860 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 152 transitions. [2018-12-03 18:22:11,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has 150 states. [2018-12-03 18:22:11,860 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 152 transitions. [2018-12-03 18:22:11,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-12-03 18:22:11,861 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:11,861 INFO L402 BasicCegarLoop]: trace histogram [75, 74, 1, 1] [2018-12-03 18:22:11,861 INFO L423 AbstractCegarLoop]: === Iteration 75 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:11,861 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:11,861 INFO L82 PathProgramCache]: Analyzing trace with hash -386543244, now seen corresponding path program 74 times [2018-12-03 18:22:11,861 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:11,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:11,862 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:11,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:11,862 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:11,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:14,501 INFO L134 CoverageAnalysis]: Checked inductivity of 5550 backedges. 0 proven. 5550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:14,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:14,502 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:14,502 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:14,502 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:14,502 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:14,502 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 18:22:14,511 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:22:14,511 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:22:14,587 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 75 check-sat command(s) [2018-12-03 18:22:14,588 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:22:14,590 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:17,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5550 backedges. 0 proven. 5550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:17,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:24,578 INFO L134 CoverageAnalysis]: Checked inductivity of 5550 backedges. 0 proven. 5550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:24,597 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:24,597 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 225 [2018-12-03 18:22:24,597 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:24,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2018-12-03 18:22:24,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2018-12-03 18:22:24,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22876, Invalid=28426, Unknown=0, NotChecked=0, Total=51302 [2018-12-03 18:22:24,600 INFO L87 Difference]: Start difference. First operand 152 states and 152 transitions. Second operand 152 states. [2018-12-03 18:22:25,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:25,027 INFO L93 Difference]: Finished difference Result 155 states and 155 transitions. [2018-12-03 18:22:25,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-12-03 18:22:25,028 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 151 [2018-12-03 18:22:25,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:25,028 INFO L225 Difference]: With dead ends: 155 [2018-12-03 18:22:25,028 INFO L226 Difference]: Without dead ends: 154 [2018-12-03 18:22:25,030 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22350 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=22876, Invalid=28426, Unknown=0, NotChecked=0, Total=51302 [2018-12-03 18:22:25,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2018-12-03 18:22:25,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 154. [2018-12-03 18:22:25,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-12-03 18:22:25,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 154 transitions. [2018-12-03 18:22:25,033 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 154 transitions. Word has length 151 [2018-12-03 18:22:25,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:25,033 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 154 transitions. [2018-12-03 18:22:25,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has 152 states. [2018-12-03 18:22:25,034 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 154 transitions. [2018-12-03 18:22:25,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-12-03 18:22:25,034 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:25,034 INFO L402 BasicCegarLoop]: trace histogram [76, 75, 1, 1] [2018-12-03 18:22:25,034 INFO L423 AbstractCegarLoop]: === Iteration 76 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:25,035 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:25,035 INFO L82 PathProgramCache]: Analyzing trace with hash -2100868938, now seen corresponding path program 75 times [2018-12-03 18:22:25,035 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:25,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:25,035 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:22:25,035 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:25,035 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:25,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:27,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5700 backedges. 0 proven. 5700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:27,441 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:27,441 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:27,442 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:27,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:27,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:27,442 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 18:22:27,451 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:22:27,451 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:22:27,495 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:22:27,495 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:22:27,498 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:30,748 INFO L134 CoverageAnalysis]: Checked inductivity of 5700 backedges. 0 proven. 5700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:30,748 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:37,734 INFO L134 CoverageAnalysis]: Checked inductivity of 5700 backedges. 0 proven. 5700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:37,752 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:37,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 228 [2018-12-03 18:22:37,753 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:37,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 154 states [2018-12-03 18:22:37,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2018-12-03 18:22:37,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23485, Invalid=29185, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 18:22:37,756 INFO L87 Difference]: Start difference. First operand 154 states and 154 transitions. Second operand 154 states. [2018-12-03 18:22:38,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:38,230 INFO L93 Difference]: Finished difference Result 157 states and 157 transitions. [2018-12-03 18:22:38,230 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2018-12-03 18:22:38,230 INFO L78 Accepts]: Start accepts. Automaton has 154 states. Word has length 153 [2018-12-03 18:22:38,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:38,231 INFO L225 Difference]: With dead ends: 157 [2018-12-03 18:22:38,231 INFO L226 Difference]: Without dead ends: 156 [2018-12-03 18:22:38,233 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22952 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=23485, Invalid=29185, Unknown=0, NotChecked=0, Total=52670 [2018-12-03 18:22:38,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-12-03 18:22:38,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2018-12-03 18:22:38,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2018-12-03 18:22:38,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 156 transitions. [2018-12-03 18:22:38,236 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 156 transitions. Word has length 153 [2018-12-03 18:22:38,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:38,236 INFO L480 AbstractCegarLoop]: Abstraction has 156 states and 156 transitions. [2018-12-03 18:22:38,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has 154 states. [2018-12-03 18:22:38,236 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 156 transitions. [2018-12-03 18:22:38,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-12-03 18:22:38,237 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:38,237 INFO L402 BasicCegarLoop]: trace histogram [77, 76, 1, 1] [2018-12-03 18:22:38,237 INFO L423 AbstractCegarLoop]: === Iteration 77 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:38,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:38,238 INFO L82 PathProgramCache]: Analyzing trace with hash -300419208, now seen corresponding path program 76 times [2018-12-03 18:22:38,238 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:38,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:38,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:22:38,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:38,238 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:38,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:40,899 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 0 proven. 5852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:40,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:40,899 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:40,899 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:40,899 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:40,899 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:40,899 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 18:22:40,907 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:40,908 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:22:40,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:40,950 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:44,267 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 0 proven. 5852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:44,268 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:22:51,245 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 0 proven. 5852 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:51,264 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:22:51,264 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 231 [2018-12-03 18:22:51,264 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:22:51,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 156 states [2018-12-03 18:22:51,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2018-12-03 18:22:51,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24102, Invalid=29954, Unknown=0, NotChecked=0, Total=54056 [2018-12-03 18:22:51,268 INFO L87 Difference]: Start difference. First operand 156 states and 156 transitions. Second operand 156 states. [2018-12-03 18:22:51,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:22:51,660 INFO L93 Difference]: Finished difference Result 159 states and 159 transitions. [2018-12-03 18:22:51,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-12-03 18:22:51,661 INFO L78 Accepts]: Start accepts. Automaton has 156 states. Word has length 155 [2018-12-03 18:22:51,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:22:51,662 INFO L225 Difference]: With dead ends: 159 [2018-12-03 18:22:51,662 INFO L226 Difference]: Without dead ends: 158 [2018-12-03 18:22:51,664 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23562 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=24102, Invalid=29954, Unknown=0, NotChecked=0, Total=54056 [2018-12-03 18:22:51,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2018-12-03 18:22:51,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2018-12-03 18:22:51,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2018-12-03 18:22:51,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 158 transitions. [2018-12-03 18:22:51,668 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 158 transitions. Word has length 155 [2018-12-03 18:22:51,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:22:51,668 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 158 transitions. [2018-12-03 18:22:51,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has 156 states. [2018-12-03 18:22:51,668 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 158 transitions. [2018-12-03 18:22:51,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2018-12-03 18:22:51,669 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:22:51,669 INFO L402 BasicCegarLoop]: trace histogram [78, 77, 1, 1] [2018-12-03 18:22:51,669 INFO L423 AbstractCegarLoop]: === Iteration 78 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:22:51,669 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:22:51,669 INFO L82 PathProgramCache]: Analyzing trace with hash -940048966, now seen corresponding path program 77 times [2018-12-03 18:22:51,669 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:22:51,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:51,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:22:51,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:22:51,670 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:22:51,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:22:54,292 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 6006 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:54,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:54,293 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:22:54,293 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:22:54,293 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:22:54,293 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:22:54,293 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 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 18:22:54,301 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:22:54,301 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:22:54,402 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 78 check-sat command(s) [2018-12-03 18:22:54,403 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:22:54,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:22:57,515 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 6006 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:22:57,515 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:04,515 INFO L134 CoverageAnalysis]: Checked inductivity of 6006 backedges. 0 proven. 6006 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:04,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:04,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78, 78] total 234 [2018-12-03 18:23:04,535 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:04,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 158 states [2018-12-03 18:23:04,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2018-12-03 18:23:04,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24727, Invalid=30733, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 18:23:04,538 INFO L87 Difference]: Start difference. First operand 158 states and 158 transitions. Second operand 158 states. [2018-12-03 18:23:04,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:23:04,970 INFO L93 Difference]: Finished difference Result 161 states and 161 transitions. [2018-12-03 18:23:04,971 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-12-03 18:23:04,971 INFO L78 Accepts]: Start accepts. Automaton has 158 states. Word has length 157 [2018-12-03 18:23:04,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:23:04,972 INFO L225 Difference]: With dead ends: 161 [2018-12-03 18:23:04,972 INFO L226 Difference]: Without dead ends: 160 [2018-12-03 18:23:04,974 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24180 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=24727, Invalid=30733, Unknown=0, NotChecked=0, Total=55460 [2018-12-03 18:23:04,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2018-12-03 18:23:04,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2018-12-03 18:23:04,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-12-03 18:23:04,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 160 transitions. [2018-12-03 18:23:04,979 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 160 transitions. Word has length 157 [2018-12-03 18:23:04,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:23:04,980 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 160 transitions. [2018-12-03 18:23:04,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has 158 states. [2018-12-03 18:23:04,980 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 160 transitions. [2018-12-03 18:23:04,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-12-03 18:23:04,980 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:23:04,981 INFO L402 BasicCegarLoop]: trace histogram [79, 78, 1, 1] [2018-12-03 18:23:04,981 INFO L423 AbstractCegarLoop]: === Iteration 79 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:23:04,981 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:23:04,981 INFO L82 PathProgramCache]: Analyzing trace with hash -1443923076, now seen corresponding path program 78 times [2018-12-03 18:23:04,981 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:23:04,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:04,982 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:23:04,982 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:04,982 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:23:04,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:07,565 INFO L134 CoverageAnalysis]: Checked inductivity of 6162 backedges. 0 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:07,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:07,566 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:07,566 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:07,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:07,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:07,566 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 18:23:07,575 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:23:07,575 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:23:07,617 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:23:07,618 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:23:07,621 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:10,823 INFO L134 CoverageAnalysis]: Checked inductivity of 6162 backedges. 0 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:10,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:17,896 INFO L134 CoverageAnalysis]: Checked inductivity of 6162 backedges. 0 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:17,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:17,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 237 [2018-12-03 18:23:17,916 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:17,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 160 states [2018-12-03 18:23:17,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2018-12-03 18:23:17,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25360, Invalid=31522, Unknown=0, NotChecked=0, Total=56882 [2018-12-03 18:23:17,920 INFO L87 Difference]: Start difference. First operand 160 states and 160 transitions. Second operand 160 states. [2018-12-03 18:23:18,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:23:18,360 INFO L93 Difference]: Finished difference Result 163 states and 163 transitions. [2018-12-03 18:23:18,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-12-03 18:23:18,360 INFO L78 Accepts]: Start accepts. Automaton has 160 states. Word has length 159 [2018-12-03 18:23:18,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:23:18,361 INFO L225 Difference]: With dead ends: 163 [2018-12-03 18:23:18,361 INFO L226 Difference]: Without dead ends: 162 [2018-12-03 18:23:18,362 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24806 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=25360, Invalid=31522, Unknown=0, NotChecked=0, Total=56882 [2018-12-03 18:23:18,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2018-12-03 18:23:18,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2018-12-03 18:23:18,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-12-03 18:23:18,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 162 transitions. [2018-12-03 18:23:18,369 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 162 transitions. Word has length 159 [2018-12-03 18:23:18,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:23:18,369 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 162 transitions. [2018-12-03 18:23:18,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 160 states. [2018-12-03 18:23:18,370 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 162 transitions. [2018-12-03 18:23:18,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-12-03 18:23:18,370 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:23:18,371 INFO L402 BasicCegarLoop]: trace histogram [80, 79, 1, 1] [2018-12-03 18:23:18,371 INFO L423 AbstractCegarLoop]: === Iteration 80 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:23:18,371 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:23:18,371 INFO L82 PathProgramCache]: Analyzing trace with hash -335638338, now seen corresponding path program 79 times [2018-12-03 18:23:18,371 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:23:18,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:18,372 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:23:18,372 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:18,372 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:23:18,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:20,998 INFO L134 CoverageAnalysis]: Checked inductivity of 6320 backedges. 0 proven. 6320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:20,998 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:20,999 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:20,999 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:20,999 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:20,999 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:20,999 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 18:23:21,008 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:23:21,008 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:23:21,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:21,051 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:24,273 INFO L134 CoverageAnalysis]: Checked inductivity of 6320 backedges. 0 proven. 6320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:24,273 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:31,450 INFO L134 CoverageAnalysis]: Checked inductivity of 6320 backedges. 0 proven. 6320 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:31,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:31,469 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 240 [2018-12-03 18:23:31,469 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:31,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 162 states [2018-12-03 18:23:31,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 162 interpolants. [2018-12-03 18:23:31,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26001, Invalid=32321, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 18:23:31,472 INFO L87 Difference]: Start difference. First operand 162 states and 162 transitions. Second operand 162 states. [2018-12-03 18:23:31,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:23:31,863 INFO L93 Difference]: Finished difference Result 165 states and 165 transitions. [2018-12-03 18:23:31,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2018-12-03 18:23:31,863 INFO L78 Accepts]: Start accepts. Automaton has 162 states. Word has length 161 [2018-12-03 18:23:31,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:23:31,865 INFO L225 Difference]: With dead ends: 165 [2018-12-03 18:23:31,865 INFO L226 Difference]: Without dead ends: 164 [2018-12-03 18:23:31,867 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25440 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=26001, Invalid=32321, Unknown=0, NotChecked=0, Total=58322 [2018-12-03 18:23:31,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2018-12-03 18:23:31,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2018-12-03 18:23:31,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-12-03 18:23:31,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 164 transitions. [2018-12-03 18:23:31,873 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 164 transitions. Word has length 161 [2018-12-03 18:23:31,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:23:31,873 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 164 transitions. [2018-12-03 18:23:31,873 INFO L481 AbstractCegarLoop]: Interpolant automaton has 162 states. [2018-12-03 18:23:31,873 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 164 transitions. [2018-12-03 18:23:31,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2018-12-03 18:23:31,874 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:23:31,874 INFO L402 BasicCegarLoop]: trace histogram [81, 80, 1, 1] [2018-12-03 18:23:31,875 INFO L423 AbstractCegarLoop]: === Iteration 81 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:23:31,875 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:23:31,875 INFO L82 PathProgramCache]: Analyzing trace with hash -425894528, now seen corresponding path program 80 times [2018-12-03 18:23:31,875 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:23:31,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:31,876 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:23:31,876 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:31,876 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:23:31,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:34,757 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 0 proven. 6480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:34,757 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:34,758 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:34,758 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:34,758 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:34,758 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:34,758 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 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 18:23:34,767 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:23:34,768 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:23:34,861 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 81 check-sat command(s) [2018-12-03 18:23:34,861 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:23:34,864 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:38,149 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 0 proven. 6480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:38,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:45,590 INFO L134 CoverageAnalysis]: Checked inductivity of 6480 backedges. 0 proven. 6480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:45,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:45,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 243 [2018-12-03 18:23:45,609 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:45,610 INFO L459 AbstractCegarLoop]: Interpolant automaton has 164 states [2018-12-03 18:23:45,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2018-12-03 18:23:45,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26650, Invalid=33130, Unknown=0, NotChecked=0, Total=59780 [2018-12-03 18:23:45,613 INFO L87 Difference]: Start difference. First operand 164 states and 164 transitions. Second operand 164 states. [2018-12-03 18:23:46,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:23:46,023 INFO L93 Difference]: Finished difference Result 167 states and 167 transitions. [2018-12-03 18:23:46,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-12-03 18:23:46,023 INFO L78 Accepts]: Start accepts. Automaton has 164 states. Word has length 163 [2018-12-03 18:23:46,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:23:46,024 INFO L225 Difference]: With dead ends: 167 [2018-12-03 18:23:46,024 INFO L226 Difference]: Without dead ends: 166 [2018-12-03 18:23:46,025 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 243 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26082 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=26650, Invalid=33130, Unknown=0, NotChecked=0, Total=59780 [2018-12-03 18:23:46,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-12-03 18:23:46,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2018-12-03 18:23:46,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-12-03 18:23:46,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 166 transitions. [2018-12-03 18:23:46,031 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 166 transitions. Word has length 163 [2018-12-03 18:23:46,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:23:46,031 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 166 transitions. [2018-12-03 18:23:46,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has 164 states. [2018-12-03 18:23:46,031 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 166 transitions. [2018-12-03 18:23:46,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-12-03 18:23:46,032 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:23:46,032 INFO L402 BasicCegarLoop]: trace histogram [82, 81, 1, 1] [2018-12-03 18:23:46,032 INFO L423 AbstractCegarLoop]: === Iteration 82 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:23:46,032 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:23:46,032 INFO L82 PathProgramCache]: Analyzing trace with hash -1262747198, now seen corresponding path program 81 times [2018-12-03 18:23:46,033 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:23:46,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:46,033 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:23:46,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:23:46,034 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:23:46,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:23:48,743 INFO L134 CoverageAnalysis]: Checked inductivity of 6642 backedges. 0 proven. 6642 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:48,743 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:48,743 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:23:48,744 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:23:48,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:23:48,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:23:48,744 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 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 18:23:48,753 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:23:48,753 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:23:48,798 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:23:48,798 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:23:48,801 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:23:52,166 INFO L134 CoverageAnalysis]: Checked inductivity of 6642 backedges. 0 proven. 6642 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:52,166 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:23:59,775 INFO L134 CoverageAnalysis]: Checked inductivity of 6642 backedges. 0 proven. 6642 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:23:59,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:23:59,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82, 82] total 246 [2018-12-03 18:23:59,795 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:23:59,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 166 states [2018-12-03 18:23:59,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 166 interpolants. [2018-12-03 18:23:59,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27307, Invalid=33949, Unknown=0, NotChecked=0, Total=61256 [2018-12-03 18:23:59,799 INFO L87 Difference]: Start difference. First operand 166 states and 166 transitions. Second operand 166 states. [2018-12-03 18:24:00,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:24:00,260 INFO L93 Difference]: Finished difference Result 169 states and 169 transitions. [2018-12-03 18:24:00,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-12-03 18:24:00,261 INFO L78 Accepts]: Start accepts. Automaton has 166 states. Word has length 165 [2018-12-03 18:24:00,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:24:00,262 INFO L225 Difference]: With dead ends: 169 [2018-12-03 18:24:00,262 INFO L226 Difference]: Without dead ends: 168 [2018-12-03 18:24:00,263 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26732 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=27307, Invalid=33949, Unknown=0, NotChecked=0, Total=61256 [2018-12-03 18:24:00,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2018-12-03 18:24:00,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 168. [2018-12-03 18:24:00,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2018-12-03 18:24:00,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 168 transitions. [2018-12-03 18:24:00,267 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 168 transitions. Word has length 165 [2018-12-03 18:24:00,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:24:00,267 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 168 transitions. [2018-12-03 18:24:00,267 INFO L481 AbstractCegarLoop]: Interpolant automaton has 166 states. [2018-12-03 18:24:00,267 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 168 transitions. [2018-12-03 18:24:00,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2018-12-03 18:24:00,268 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:24:00,268 INFO L402 BasicCegarLoop]: trace histogram [83, 82, 1, 1] [2018-12-03 18:24:00,268 INFO L423 AbstractCegarLoop]: === Iteration 83 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:24:00,268 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:24:00,268 INFO L82 PathProgramCache]: Analyzing trace with hash 1975688580, now seen corresponding path program 82 times [2018-12-03 18:24:00,269 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:24:00,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:00,269 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:24:00,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:00,269 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:24:00,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:03,081 INFO L134 CoverageAnalysis]: Checked inductivity of 6806 backedges. 0 proven. 6806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:03,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:03,081 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:24:03,081 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:24:03,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:24:03,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:03,082 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 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 18:24:03,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:24:03,091 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:24:03,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:03,134 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:24:06,586 INFO L134 CoverageAnalysis]: Checked inductivity of 6806 backedges. 0 proven. 6806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:06,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:24:14,373 INFO L134 CoverageAnalysis]: Checked inductivity of 6806 backedges. 0 proven. 6806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:14,392 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:24:14,392 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 249 [2018-12-03 18:24:14,392 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:24:14,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 168 states [2018-12-03 18:24:14,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2018-12-03 18:24:14,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27972, Invalid=34778, Unknown=0, NotChecked=0, Total=62750 [2018-12-03 18:24:14,395 INFO L87 Difference]: Start difference. First operand 168 states and 168 transitions. Second operand 168 states. [2018-12-03 18:24:15,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:24:15,000 INFO L93 Difference]: Finished difference Result 171 states and 171 transitions. [2018-12-03 18:24:15,000 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-12-03 18:24:15,000 INFO L78 Accepts]: Start accepts. Automaton has 168 states. Word has length 167 [2018-12-03 18:24:15,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:24:15,001 INFO L225 Difference]: With dead ends: 171 [2018-12-03 18:24:15,001 INFO L226 Difference]: Without dead ends: 170 [2018-12-03 18:24:15,003 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 249 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27390 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=27972, Invalid=34778, Unknown=0, NotChecked=0, Total=62750 [2018-12-03 18:24:15,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2018-12-03 18:24:15,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 170. [2018-12-03 18:24:15,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-12-03 18:24:15,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 170 transitions. [2018-12-03 18:24:15,006 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 170 transitions. Word has length 167 [2018-12-03 18:24:15,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:24:15,006 INFO L480 AbstractCegarLoop]: Abstraction has 170 states and 170 transitions. [2018-12-03 18:24:15,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has 168 states. [2018-12-03 18:24:15,007 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 170 transitions. [2018-12-03 18:24:15,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-12-03 18:24:15,007 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:24:15,007 INFO L402 BasicCegarLoop]: trace histogram [84, 83, 1, 1] [2018-12-03 18:24:15,007 INFO L423 AbstractCegarLoop]: === Iteration 84 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:24:15,008 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:24:15,008 INFO L82 PathProgramCache]: Analyzing trace with hash 261181638, now seen corresponding path program 83 times [2018-12-03 18:24:15,008 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:24:15,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:15,008 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:24:15,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:15,009 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:24:15,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:17,871 INFO L134 CoverageAnalysis]: Checked inductivity of 6972 backedges. 0 proven. 6972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:17,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:17,871 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:24:17,871 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:24:17,871 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:24:17,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:17,871 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 18:24:17,879 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:24:17,880 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:24:17,976 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 84 check-sat command(s) [2018-12-03 18:24:17,976 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:24:17,980 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:24:21,495 INFO L134 CoverageAnalysis]: Checked inductivity of 6972 backedges. 0 proven. 6972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:21,495 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:24:29,449 INFO L134 CoverageAnalysis]: Checked inductivity of 6972 backedges. 0 proven. 6972 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:29,468 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:24:29,468 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 252 [2018-12-03 18:24:29,468 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:24:29,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 170 states [2018-12-03 18:24:29,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 170 interpolants. [2018-12-03 18:24:29,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28645, Invalid=35617, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 18:24:29,472 INFO L87 Difference]: Start difference. First operand 170 states and 170 transitions. Second operand 170 states. [2018-12-03 18:24:29,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:24:29,907 INFO L93 Difference]: Finished difference Result 173 states and 173 transitions. [2018-12-03 18:24:29,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2018-12-03 18:24:29,907 INFO L78 Accepts]: Start accepts. Automaton has 170 states. Word has length 169 [2018-12-03 18:24:29,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:24:29,908 INFO L225 Difference]: With dead ends: 173 [2018-12-03 18:24:29,908 INFO L226 Difference]: Without dead ends: 172 [2018-12-03 18:24:29,909 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28056 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=28645, Invalid=35617, Unknown=0, NotChecked=0, Total=64262 [2018-12-03 18:24:29,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-12-03 18:24:29,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2018-12-03 18:24:29,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2018-12-03 18:24:29,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 172 transitions. [2018-12-03 18:24:29,913 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 172 transitions. Word has length 169 [2018-12-03 18:24:29,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:24:29,913 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 172 transitions. [2018-12-03 18:24:29,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has 170 states. [2018-12-03 18:24:29,913 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 172 transitions. [2018-12-03 18:24:29,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2018-12-03 18:24:29,914 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:24:29,914 INFO L402 BasicCegarLoop]: trace histogram [85, 84, 1, 1] [2018-12-03 18:24:29,914 INFO L423 AbstractCegarLoop]: === Iteration 85 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:24:29,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:24:29,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1887452040, now seen corresponding path program 84 times [2018-12-03 18:24:29,915 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:24:29,915 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:29,915 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:24:29,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:29,916 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:24:29,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:32,823 INFO L134 CoverageAnalysis]: Checked inductivity of 7140 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:32,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:32,824 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:24:32,824 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:24:32,824 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:24:32,824 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:32,824 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 18:24:32,833 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:24:32,833 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:24:32,878 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:24:32,878 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:24:32,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:24:36,468 INFO L134 CoverageAnalysis]: Checked inductivity of 7140 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:36,468 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:24:44,636 INFO L134 CoverageAnalysis]: Checked inductivity of 7140 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:44,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:24:44,656 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 255 [2018-12-03 18:24:44,656 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:24:44,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 172 states [2018-12-03 18:24:44,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2018-12-03 18:24:44,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29326, Invalid=36466, Unknown=0, NotChecked=0, Total=65792 [2018-12-03 18:24:44,660 INFO L87 Difference]: Start difference. First operand 172 states and 172 transitions. Second operand 172 states. [2018-12-03 18:24:45,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:24:45,106 INFO L93 Difference]: Finished difference Result 175 states and 175 transitions. [2018-12-03 18:24:45,107 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-12-03 18:24:45,107 INFO L78 Accepts]: Start accepts. Automaton has 172 states. Word has length 171 [2018-12-03 18:24:45,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:24:45,108 INFO L225 Difference]: With dead ends: 175 [2018-12-03 18:24:45,108 INFO L226 Difference]: Without dead ends: 174 [2018-12-03 18:24:45,109 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28730 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=29326, Invalid=36466, Unknown=0, NotChecked=0, Total=65792 [2018-12-03 18:24:45,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2018-12-03 18:24:45,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 174. [2018-12-03 18:24:45,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2018-12-03 18:24:45,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 174 transitions. [2018-12-03 18:24:45,115 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 174 transitions. Word has length 171 [2018-12-03 18:24:45,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:24:45,116 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 174 transitions. [2018-12-03 18:24:45,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has 172 states. [2018-12-03 18:24:45,116 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 174 transitions. [2018-12-03 18:24:45,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-12-03 18:24:45,117 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:24:45,117 INFO L402 BasicCegarLoop]: trace histogram [86, 85, 1, 1] [2018-12-03 18:24:45,117 INFO L423 AbstractCegarLoop]: === Iteration 86 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:24:45,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:24:45,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1365212618, now seen corresponding path program 85 times [2018-12-03 18:24:45,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:24:45,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:45,118 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:24:45,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:24:45,119 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:24:45,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:48,149 INFO L134 CoverageAnalysis]: Checked inductivity of 7310 backedges. 0 proven. 7310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:48,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:48,150 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:24:48,150 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:24:48,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:24:48,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:24:48,150 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 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 18:24:48,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:24:48,160 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:24:48,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:24:48,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:24:51,905 INFO L134 CoverageAnalysis]: Checked inductivity of 7310 backedges. 0 proven. 7310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:24:51,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:25:00,303 INFO L134 CoverageAnalysis]: Checked inductivity of 7310 backedges. 0 proven. 7310 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:00,321 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:25:00,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86, 86] total 258 [2018-12-03 18:25:00,322 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:25:00,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 174 states [2018-12-03 18:25:00,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 174 interpolants. [2018-12-03 18:25:00,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30015, Invalid=37325, Unknown=0, NotChecked=0, Total=67340 [2018-12-03 18:25:00,326 INFO L87 Difference]: Start difference. First operand 174 states and 174 transitions. Second operand 174 states. [2018-12-03 18:25:00,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:25:00,781 INFO L93 Difference]: Finished difference Result 177 states and 177 transitions. [2018-12-03 18:25:00,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2018-12-03 18:25:00,781 INFO L78 Accepts]: Start accepts. Automaton has 174 states. Word has length 173 [2018-12-03 18:25:00,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:25:00,782 INFO L225 Difference]: With dead ends: 177 [2018-12-03 18:25:00,782 INFO L226 Difference]: Without dead ends: 176 [2018-12-03 18:25:00,784 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 258 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29412 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=30015, Invalid=37325, Unknown=0, NotChecked=0, Total=67340 [2018-12-03 18:25:00,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2018-12-03 18:25:00,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 176. [2018-12-03 18:25:00,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-12-03 18:25:00,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 176 transitions. [2018-12-03 18:25:00,790 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 176 transitions. Word has length 173 [2018-12-03 18:25:00,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:25:00,790 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 176 transitions. [2018-12-03 18:25:00,790 INFO L481 AbstractCegarLoop]: Interpolant automaton has 174 states. [2018-12-03 18:25:00,790 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 176 transitions. [2018-12-03 18:25:00,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-12-03 18:25:00,791 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:25:00,791 INFO L402 BasicCegarLoop]: trace histogram [87, 86, 1, 1] [2018-12-03 18:25:00,791 INFO L423 AbstractCegarLoop]: === Iteration 87 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:25:00,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:25:00,792 INFO L82 PathProgramCache]: Analyzing trace with hash 2004301708, now seen corresponding path program 86 times [2018-12-03 18:25:00,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:25:00,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:00,792 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:25:00,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:00,793 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:25:00,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:03,874 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 0 proven. 7482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:03,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:03,874 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:25:03,874 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:25:03,874 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:25:03,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:03,875 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:25:03,884 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:25:03,884 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:25:03,985 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 87 check-sat command(s) [2018-12-03 18:25:03,985 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:25:03,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:25:07,774 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 0 proven. 7482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:07,775 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:25:16,400 INFO L134 CoverageAnalysis]: Checked inductivity of 7482 backedges. 0 proven. 7482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:16,419 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:25:16,419 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 261 [2018-12-03 18:25:16,419 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:25:16,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 176 states [2018-12-03 18:25:16,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2018-12-03 18:25:16,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30712, Invalid=38194, Unknown=0, NotChecked=0, Total=68906 [2018-12-03 18:25:16,423 INFO L87 Difference]: Start difference. First operand 176 states and 176 transitions. Second operand 176 states. [2018-12-03 18:25:16,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:25:16,923 INFO L93 Difference]: Finished difference Result 179 states and 179 transitions. [2018-12-03 18:25:16,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2018-12-03 18:25:16,923 INFO L78 Accepts]: Start accepts. Automaton has 176 states. Word has length 175 [2018-12-03 18:25:16,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:25:16,924 INFO L225 Difference]: With dead ends: 179 [2018-12-03 18:25:16,924 INFO L226 Difference]: Without dead ends: 178 [2018-12-03 18:25:16,925 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30102 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=30712, Invalid=38194, Unknown=0, NotChecked=0, Total=68906 [2018-12-03 18:25:16,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2018-12-03 18:25:16,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2018-12-03 18:25:16,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2018-12-03 18:25:16,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 178 transitions. [2018-12-03 18:25:16,929 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 178 transitions. Word has length 175 [2018-12-03 18:25:16,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:25:16,929 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 178 transitions. [2018-12-03 18:25:16,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has 176 states. [2018-12-03 18:25:16,929 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 178 transitions. [2018-12-03 18:25:16,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2018-12-03 18:25:16,930 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:25:16,930 INFO L402 BasicCegarLoop]: trace histogram [88, 87, 1, 1] [2018-12-03 18:25:16,930 INFO L423 AbstractCegarLoop]: === Iteration 88 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:25:16,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:25:16,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1988593870, now seen corresponding path program 87 times [2018-12-03 18:25:16,931 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:25:16,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:16,931 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:25:16,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:16,931 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:25:16,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:20,054 INFO L134 CoverageAnalysis]: Checked inductivity of 7656 backedges. 0 proven. 7656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:20,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:20,055 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:25:20,055 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:25:20,055 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:25:20,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:20,055 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 18:25:20,065 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:25:20,065 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:25:20,112 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:25:20,113 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:25:20,116 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:25:24,088 INFO L134 CoverageAnalysis]: Checked inductivity of 7656 backedges. 0 proven. 7656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:24,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:25:32,834 INFO L134 CoverageAnalysis]: Checked inductivity of 7656 backedges. 0 proven. 7656 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:32,854 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:25:32,854 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 264 [2018-12-03 18:25:32,855 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:25:32,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 178 states [2018-12-03 18:25:32,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2018-12-03 18:25:32,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31417, Invalid=39073, Unknown=0, NotChecked=0, Total=70490 [2018-12-03 18:25:32,858 INFO L87 Difference]: Start difference. First operand 178 states and 178 transitions. Second operand 178 states. [2018-12-03 18:25:33,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:25:33,380 INFO L93 Difference]: Finished difference Result 181 states and 181 transitions. [2018-12-03 18:25:33,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2018-12-03 18:25:33,380 INFO L78 Accepts]: Start accepts. Automaton has 178 states. Word has length 177 [2018-12-03 18:25:33,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:25:33,381 INFO L225 Difference]: With dead ends: 181 [2018-12-03 18:25:33,381 INFO L226 Difference]: Without dead ends: 180 [2018-12-03 18:25:33,383 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 440 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30800 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=31417, Invalid=39073, Unknown=0, NotChecked=0, Total=70490 [2018-12-03 18:25:33,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2018-12-03 18:25:33,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2018-12-03 18:25:33,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-12-03 18:25:33,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 180 transitions. [2018-12-03 18:25:33,387 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 180 transitions. Word has length 177 [2018-12-03 18:25:33,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:25:33,387 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 180 transitions. [2018-12-03 18:25:33,387 INFO L481 AbstractCegarLoop]: Interpolant automaton has 178 states. [2018-12-03 18:25:33,387 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 180 transitions. [2018-12-03 18:25:33,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2018-12-03 18:25:33,388 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:25:33,388 INFO L402 BasicCegarLoop]: trace histogram [89, 88, 1, 1] [2018-12-03 18:25:33,388 INFO L423 AbstractCegarLoop]: === Iteration 89 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:25:33,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:25:33,388 INFO L82 PathProgramCache]: Analyzing trace with hash -221736560, now seen corresponding path program 88 times [2018-12-03 18:25:33,389 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:25:33,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:33,389 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:25:33,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:33,389 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:25:33,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:36,587 INFO L134 CoverageAnalysis]: Checked inductivity of 7832 backedges. 0 proven. 7832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:36,587 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:36,587 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:25:36,588 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:25:36,588 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:25:36,588 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:36,588 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 18:25:36,597 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:25:36,597 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:25:36,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:36,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:25:40,610 INFO L134 CoverageAnalysis]: Checked inductivity of 7832 backedges. 0 proven. 7832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:40,610 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:25:49,545 INFO L134 CoverageAnalysis]: Checked inductivity of 7832 backedges. 0 proven. 7832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:49,564 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:25:49,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 89, 89] total 267 [2018-12-03 18:25:49,564 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:25:49,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 180 states [2018-12-03 18:25:49,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 180 interpolants. [2018-12-03 18:25:49,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32130, Invalid=39962, Unknown=0, NotChecked=0, Total=72092 [2018-12-03 18:25:49,568 INFO L87 Difference]: Start difference. First operand 180 states and 180 transitions. Second operand 180 states. [2018-12-03 18:25:50,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:25:50,121 INFO L93 Difference]: Finished difference Result 183 states and 183 transitions. [2018-12-03 18:25:50,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2018-12-03 18:25:50,121 INFO L78 Accepts]: Start accepts. Automaton has 180 states. Word has length 179 [2018-12-03 18:25:50,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:25:50,122 INFO L225 Difference]: With dead ends: 183 [2018-12-03 18:25:50,122 INFO L226 Difference]: Without dead ends: 182 [2018-12-03 18:25:50,123 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31506 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=32130, Invalid=39962, Unknown=0, NotChecked=0, Total=72092 [2018-12-03 18:25:50,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2018-12-03 18:25:50,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2018-12-03 18:25:50,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2018-12-03 18:25:50,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 182 transitions. [2018-12-03 18:25:50,127 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 182 transitions. Word has length 179 [2018-12-03 18:25:50,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:25:50,127 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 182 transitions. [2018-12-03 18:25:50,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 180 states. [2018-12-03 18:25:50,127 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 182 transitions. [2018-12-03 18:25:50,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2018-12-03 18:25:50,128 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:25:50,128 INFO L402 BasicCegarLoop]: trace histogram [90, 89, 1, 1] [2018-12-03 18:25:50,128 INFO L423 AbstractCegarLoop]: === Iteration 90 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:25:50,128 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:25:50,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1659531730, now seen corresponding path program 89 times [2018-12-03 18:25:50,129 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:25:50,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:50,129 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:25:50,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:25:50,129 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:25:50,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:25:53,359 INFO L134 CoverageAnalysis]: Checked inductivity of 8010 backedges. 0 proven. 8010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:53,359 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:53,359 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:25:53,359 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:25:53,359 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:25:53,360 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:25:53,360 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 18:25:53,368 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:25:53,368 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:25:53,488 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 90 check-sat command(s) [2018-12-03 18:25:53,489 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:25:53,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:25:57,537 INFO L134 CoverageAnalysis]: Checked inductivity of 8010 backedges. 0 proven. 8010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:25:57,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:26:06,711 INFO L134 CoverageAnalysis]: Checked inductivity of 8010 backedges. 0 proven. 8010 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:06,730 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:26:06,730 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 270 [2018-12-03 18:26:06,730 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:26:06,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 182 states [2018-12-03 18:26:06,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 182 interpolants. [2018-12-03 18:26:06,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32851, Invalid=40861, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 18:26:06,734 INFO L87 Difference]: Start difference. First operand 182 states and 182 transitions. Second operand 182 states. [2018-12-03 18:26:07,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:26:07,191 INFO L93 Difference]: Finished difference Result 185 states and 185 transitions. [2018-12-03 18:26:07,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2018-12-03 18:26:07,191 INFO L78 Accepts]: Start accepts. Automaton has 182 states. Word has length 181 [2018-12-03 18:26:07,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:26:07,192 INFO L225 Difference]: With dead ends: 185 [2018-12-03 18:26:07,192 INFO L226 Difference]: Without dead ends: 184 [2018-12-03 18:26:07,194 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32220 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=32851, Invalid=40861, Unknown=0, NotChecked=0, Total=73712 [2018-12-03 18:26:07,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-12-03 18:26:07,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 184. [2018-12-03 18:26:07,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-12-03 18:26:07,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 184 transitions. [2018-12-03 18:26:07,198 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 184 transitions. Word has length 181 [2018-12-03 18:26:07,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:26:07,198 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 184 transitions. [2018-12-03 18:26:07,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has 182 states. [2018-12-03 18:26:07,198 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 184 transitions. [2018-12-03 18:26:07,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2018-12-03 18:26:07,199 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:26:07,199 INFO L402 BasicCegarLoop]: trace histogram [91, 90, 1, 1] [2018-12-03 18:26:07,199 INFO L423 AbstractCegarLoop]: === Iteration 91 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:26:07,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:26:07,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1377126804, now seen corresponding path program 90 times [2018-12-03 18:26:07,199 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:26:07,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:07,200 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:26:07,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:07,200 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:26:07,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:10,570 INFO L134 CoverageAnalysis]: Checked inductivity of 8190 backedges. 0 proven. 8190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:10,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:10,570 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:26:10,570 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:26:10,570 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:26:10,570 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:10,570 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 18:26:10,579 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:26:10,579 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:26:10,628 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:26:10,628 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:26:10,632 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:26:14,737 INFO L134 CoverageAnalysis]: Checked inductivity of 8190 backedges. 0 proven. 8190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:14,738 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:26:24,271 INFO L134 CoverageAnalysis]: Checked inductivity of 8190 backedges. 0 proven. 8190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:24,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:26:24,290 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 91, 91] total 273 [2018-12-03 18:26:24,290 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:26:24,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 184 states [2018-12-03 18:26:24,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 184 interpolants. [2018-12-03 18:26:24,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33580, Invalid=41770, Unknown=0, NotChecked=0, Total=75350 [2018-12-03 18:26:24,294 INFO L87 Difference]: Start difference. First operand 184 states and 184 transitions. Second operand 184 states. [2018-12-03 18:26:24,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:26:24,837 INFO L93 Difference]: Finished difference Result 187 states and 187 transitions. [2018-12-03 18:26:24,837 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2018-12-03 18:26:24,837 INFO L78 Accepts]: Start accepts. Automaton has 184 states. Word has length 183 [2018-12-03 18:26:24,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:26:24,838 INFO L225 Difference]: With dead ends: 187 [2018-12-03 18:26:24,838 INFO L226 Difference]: Without dead ends: 186 [2018-12-03 18:26:24,840 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32942 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=33580, Invalid=41770, Unknown=0, NotChecked=0, Total=75350 [2018-12-03 18:26:24,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-12-03 18:26:24,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 186. [2018-12-03 18:26:24,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-12-03 18:26:24,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 186 transitions. [2018-12-03 18:26:24,845 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 186 transitions. Word has length 183 [2018-12-03 18:26:24,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:26:24,846 INFO L480 AbstractCegarLoop]: Abstraction has 186 states and 186 transitions. [2018-12-03 18:26:24,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has 184 states. [2018-12-03 18:26:24,846 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 186 transitions. [2018-12-03 18:26:24,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-12-03 18:26:24,847 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:26:24,847 INFO L402 BasicCegarLoop]: trace histogram [92, 91, 1, 1] [2018-12-03 18:26:24,847 INFO L423 AbstractCegarLoop]: === Iteration 92 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:26:24,847 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:26:24,847 INFO L82 PathProgramCache]: Analyzing trace with hash 568932566, now seen corresponding path program 91 times [2018-12-03 18:26:24,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:26:24,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:24,848 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:26:24,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:24,848 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:26:24,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:28,379 INFO L134 CoverageAnalysis]: Checked inductivity of 8372 backedges. 0 proven. 8372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:28,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:28,380 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:26:28,380 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:26:28,380 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:26:28,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:28,380 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 18:26:28,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:26:28,391 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:26:28,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:28,434 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:26:32,671 INFO L134 CoverageAnalysis]: Checked inductivity of 8372 backedges. 0 proven. 8372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:32,672 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:26:42,190 INFO L134 CoverageAnalysis]: Checked inductivity of 8372 backedges. 0 proven. 8372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:42,210 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:26:42,210 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 276 [2018-12-03 18:26:42,210 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:26:42,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 186 states [2018-12-03 18:26:42,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 186 interpolants. [2018-12-03 18:26:42,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34317, Invalid=42689, Unknown=0, NotChecked=0, Total=77006 [2018-12-03 18:26:42,214 INFO L87 Difference]: Start difference. First operand 186 states and 186 transitions. Second operand 186 states. [2018-12-03 18:26:42,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:26:42,694 INFO L93 Difference]: Finished difference Result 189 states and 189 transitions. [2018-12-03 18:26:42,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2018-12-03 18:26:42,695 INFO L78 Accepts]: Start accepts. Automaton has 186 states. Word has length 185 [2018-12-03 18:26:42,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:26:42,696 INFO L225 Difference]: With dead ends: 189 [2018-12-03 18:26:42,696 INFO L226 Difference]: Without dead ends: 188 [2018-12-03 18:26:42,698 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33672 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=34317, Invalid=42689, Unknown=0, NotChecked=0, Total=77006 [2018-12-03 18:26:42,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2018-12-03 18:26:42,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 188. [2018-12-03 18:26:42,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2018-12-03 18:26:42,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 188 transitions. [2018-12-03 18:26:42,703 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 188 transitions. Word has length 185 [2018-12-03 18:26:42,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:26:42,703 INFO L480 AbstractCegarLoop]: Abstraction has 188 states and 188 transitions. [2018-12-03 18:26:42,703 INFO L481 AbstractCegarLoop]: Interpolant automaton has 186 states. [2018-12-03 18:26:42,704 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 188 transitions. [2018-12-03 18:26:42,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-12-03 18:26:42,704 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:26:42,705 INFO L402 BasicCegarLoop]: trace histogram [93, 92, 1, 1] [2018-12-03 18:26:42,705 INFO L423 AbstractCegarLoop]: === Iteration 93 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:26:42,705 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:26:42,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1283350424, now seen corresponding path program 92 times [2018-12-03 18:26:42,705 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:26:42,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:42,706 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:26:42,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:26:42,706 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:26:42,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:26:46,214 INFO L134 CoverageAnalysis]: Checked inductivity of 8556 backedges. 0 proven. 8556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:46,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:46,214 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:26:46,214 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:26:46,214 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:26:46,214 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:26:46,215 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 18:26:46,224 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:26:46,224 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:26:46,334 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 93 check-sat command(s) [2018-12-03 18:26:46,334 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:26:46,337 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:26:50,633 INFO L134 CoverageAnalysis]: Checked inductivity of 8556 backedges. 0 proven. 8556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:26:50,633 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:27:00,348 INFO L134 CoverageAnalysis]: Checked inductivity of 8556 backedges. 0 proven. 8556 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:00,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:27:00,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 279 [2018-12-03 18:27:00,368 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:27:00,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 188 states [2018-12-03 18:27:00,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2018-12-03 18:27:00,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35062, Invalid=43618, Unknown=0, NotChecked=0, Total=78680 [2018-12-03 18:27:00,373 INFO L87 Difference]: Start difference. First operand 188 states and 188 transitions. Second operand 188 states. [2018-12-03 18:27:00,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:27:00,986 INFO L93 Difference]: Finished difference Result 191 states and 191 transitions. [2018-12-03 18:27:00,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2018-12-03 18:27:00,986 INFO L78 Accepts]: Start accepts. Automaton has 188 states. Word has length 187 [2018-12-03 18:27:00,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:27:00,987 INFO L225 Difference]: With dead ends: 191 [2018-12-03 18:27:00,987 INFO L226 Difference]: Without dead ends: 190 [2018-12-03 18:27:00,989 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34410 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=35062, Invalid=43618, Unknown=0, NotChecked=0, Total=78680 [2018-12-03 18:27:00,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2018-12-03 18:27:00,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2018-12-03 18:27:00,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-12-03 18:27:00,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 190 transitions. [2018-12-03 18:27:00,994 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 190 transitions. Word has length 187 [2018-12-03 18:27:00,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:27:00,994 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 190 transitions. [2018-12-03 18:27:00,994 INFO L481 AbstractCegarLoop]: Interpolant automaton has 188 states. [2018-12-03 18:27:00,994 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 190 transitions. [2018-12-03 18:27:00,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-12-03 18:27:00,995 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:27:00,995 INFO L402 BasicCegarLoop]: trace histogram [94, 93, 1, 1] [2018-12-03 18:27:00,996 INFO L423 AbstractCegarLoop]: === Iteration 94 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:27:00,996 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:27:00,996 INFO L82 PathProgramCache]: Analyzing trace with hash 644144602, now seen corresponding path program 93 times [2018-12-03 18:27:00,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:27:00,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:00,997 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:27:00,997 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:00,997 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:27:01,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:27:04,574 INFO L134 CoverageAnalysis]: Checked inductivity of 8742 backedges. 0 proven. 8742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:04,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:27:04,575 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:27:04,575 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:27:04,575 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:27:04,575 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:27:04,575 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 18:27:04,612 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:27:04,612 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:27:04,663 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:27:04,664 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:27:04,667 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:27:09,033 INFO L134 CoverageAnalysis]: Checked inductivity of 8742 backedges. 0 proven. 8742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:09,033 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:27:18,991 INFO L134 CoverageAnalysis]: Checked inductivity of 8742 backedges. 0 proven. 8742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:19,010 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:27:19,010 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94, 94] total 282 [2018-12-03 18:27:19,010 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:27:19,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 190 states [2018-12-03 18:27:19,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2018-12-03 18:27:19,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35815, Invalid=44557, Unknown=0, NotChecked=0, Total=80372 [2018-12-03 18:27:19,015 INFO L87 Difference]: Start difference. First operand 190 states and 190 transitions. Second operand 190 states. [2018-12-03 18:27:19,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:27:19,586 INFO L93 Difference]: Finished difference Result 193 states and 193 transitions. [2018-12-03 18:27:19,587 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2018-12-03 18:27:19,587 INFO L78 Accepts]: Start accepts. Automaton has 190 states. Word has length 189 [2018-12-03 18:27:19,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:27:19,588 INFO L225 Difference]: With dead ends: 193 [2018-12-03 18:27:19,588 INFO L226 Difference]: Without dead ends: 192 [2018-12-03 18:27:19,590 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 282 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35156 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=35815, Invalid=44557, Unknown=0, NotChecked=0, Total=80372 [2018-12-03 18:27:19,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-12-03 18:27:19,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2018-12-03 18:27:19,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2018-12-03 18:27:19,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 192 transitions. [2018-12-03 18:27:19,595 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 192 transitions. Word has length 189 [2018-12-03 18:27:19,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:27:19,595 INFO L480 AbstractCegarLoop]: Abstraction has 192 states and 192 transitions. [2018-12-03 18:27:19,595 INFO L481 AbstractCegarLoop]: Interpolant automaton has 190 states. [2018-12-03 18:27:19,595 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 192 transitions. [2018-12-03 18:27:19,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2018-12-03 18:27:19,596 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:27:19,596 INFO L402 BasicCegarLoop]: trace histogram [95, 94, 1, 1] [2018-12-03 18:27:19,596 INFO L423 AbstractCegarLoop]: === Iteration 95 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:27:19,596 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:27:19,596 INFO L82 PathProgramCache]: Analyzing trace with hash 547672988, now seen corresponding path program 94 times [2018-12-03 18:27:19,596 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:27:19,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:19,597 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:27:19,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:19,597 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:27:19,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:27:23,206 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:23,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:27:23,206 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:27:23,206 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:27:23,206 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:27:23,206 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:27:23,206 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 18:27:23,215 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:27:23,215 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:27:23,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:27:23,263 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:27:27,689 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:27,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:27:37,886 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:37,906 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:27:37,906 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 95, 95] total 285 [2018-12-03 18:27:37,906 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:27:37,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2018-12-03 18:27:37,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2018-12-03 18:27:37,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36576, Invalid=45506, Unknown=0, NotChecked=0, Total=82082 [2018-12-03 18:27:37,910 INFO L87 Difference]: Start difference. First operand 192 states and 192 transitions. Second operand 192 states. [2018-12-03 18:27:38,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:27:38,430 INFO L93 Difference]: Finished difference Result 195 states and 195 transitions. [2018-12-03 18:27:38,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2018-12-03 18:27:38,431 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 191 [2018-12-03 18:27:38,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:27:38,432 INFO L225 Difference]: With dead ends: 195 [2018-12-03 18:27:38,432 INFO L226 Difference]: Without dead ends: 194 [2018-12-03 18:27:38,435 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 285 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35910 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=36576, Invalid=45506, Unknown=0, NotChecked=0, Total=82082 [2018-12-03 18:27:38,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-12-03 18:27:38,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2018-12-03 18:27:38,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2018-12-03 18:27:38,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 194 transitions. [2018-12-03 18:27:38,439 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 194 transitions. Word has length 191 [2018-12-03 18:27:38,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:27:38,439 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 194 transitions. [2018-12-03 18:27:38,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has 192 states. [2018-12-03 18:27:38,439 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 194 transitions. [2018-12-03 18:27:38,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2018-12-03 18:27:38,440 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:27:38,440 INFO L402 BasicCegarLoop]: trace histogram [96, 95, 1, 1] [2018-12-03 18:27:38,440 INFO L423 AbstractCegarLoop]: === Iteration 96 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:27:38,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:27:38,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1967234850, now seen corresponding path program 95 times [2018-12-03 18:27:38,440 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:27:38,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:38,441 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:27:38,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:38,441 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:27:38,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:27:42,146 INFO L134 CoverageAnalysis]: Checked inductivity of 9120 backedges. 0 proven. 9120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:42,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:27:42,146 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:27:42,146 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:27:42,146 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:27:42,146 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:27:42,146 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 18:27:42,155 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:27:42,156 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:27:42,271 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 96 check-sat command(s) [2018-12-03 18:27:42,272 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:27:42,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:27:46,828 INFO L134 CoverageAnalysis]: Checked inductivity of 9120 backedges. 0 proven. 9120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:46,828 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:27:57,268 INFO L134 CoverageAnalysis]: Checked inductivity of 9120 backedges. 0 proven. 9120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:27:57,287 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:27:57,287 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 288 [2018-12-03 18:27:57,287 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:27:57,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2018-12-03 18:27:57,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2018-12-03 18:27:57,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37345, Invalid=46465, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 18:27:57,291 INFO L87 Difference]: Start difference. First operand 194 states and 194 transitions. Second operand 194 states. [2018-12-03 18:27:57,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:27:57,815 INFO L93 Difference]: Finished difference Result 197 states and 197 transitions. [2018-12-03 18:27:57,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2018-12-03 18:27:57,815 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 193 [2018-12-03 18:27:57,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:27:57,816 INFO L225 Difference]: With dead ends: 197 [2018-12-03 18:27:57,816 INFO L226 Difference]: Without dead ends: 196 [2018-12-03 18:27:57,818 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 480 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 288 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36672 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=37345, Invalid=46465, Unknown=0, NotChecked=0, Total=83810 [2018-12-03 18:27:57,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2018-12-03 18:27:57,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2018-12-03 18:27:57,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-12-03 18:27:57,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 196 transitions. [2018-12-03 18:27:57,822 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 196 transitions. Word has length 193 [2018-12-03 18:27:57,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:27:57,822 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 196 transitions. [2018-12-03 18:27:57,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 194 states. [2018-12-03 18:27:57,822 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 196 transitions. [2018-12-03 18:27:57,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-12-03 18:27:57,824 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:27:57,824 INFO L402 BasicCegarLoop]: trace histogram [97, 96, 1, 1] [2018-12-03 18:27:57,824 INFO L423 AbstractCegarLoop]: === Iteration 97 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:27:57,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:27:57,824 INFO L82 PathProgramCache]: Analyzing trace with hash -727079520, now seen corresponding path program 96 times [2018-12-03 18:27:57,825 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:27:57,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:57,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:27:57,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:27:57,825 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:27:57,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:28:01,605 INFO L134 CoverageAnalysis]: Checked inductivity of 9312 backedges. 0 proven. 9312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:28:01,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:28:01,606 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:28:01,606 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:28:01,606 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:28:01,606 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:28:01,606 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 18:28:01,615 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-12-03 18:28:01,615 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-12-03 18:28:01,668 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-12-03 18:28:01,668 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:28:01,672 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:28:06,277 INFO L134 CoverageAnalysis]: Checked inductivity of 9312 backedges. 0 proven. 9312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:28:06,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:28:16,878 INFO L134 CoverageAnalysis]: Checked inductivity of 9312 backedges. 0 proven. 9312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:28:16,897 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:28:16,897 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 291 [2018-12-03 18:28:16,897 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:28:16,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 196 states [2018-12-03 18:28:16,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2018-12-03 18:28:16,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38122, Invalid=47434, Unknown=0, NotChecked=0, Total=85556 [2018-12-03 18:28:16,902 INFO L87 Difference]: Start difference. First operand 196 states and 196 transitions. Second operand 196 states. [2018-12-03 18:28:17,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:28:17,508 INFO L93 Difference]: Finished difference Result 199 states and 199 transitions. [2018-12-03 18:28:17,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2018-12-03 18:28:17,509 INFO L78 Accepts]: Start accepts. Automaton has 196 states. Word has length 195 [2018-12-03 18:28:17,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:28:17,510 INFO L225 Difference]: With dead ends: 199 [2018-12-03 18:28:17,510 INFO L226 Difference]: Without dead ends: 198 [2018-12-03 18:28:17,511 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 291 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37442 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=38122, Invalid=47434, Unknown=0, NotChecked=0, Total=85556 [2018-12-03 18:28:17,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2018-12-03 18:28:17,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 198. [2018-12-03 18:28:17,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-12-03 18:28:17,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 198 transitions. [2018-12-03 18:28:17,516 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 198 transitions. Word has length 195 [2018-12-03 18:28:17,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:28:17,516 INFO L480 AbstractCegarLoop]: Abstraction has 198 states and 198 transitions. [2018-12-03 18:28:17,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has 196 states. [2018-12-03 18:28:17,516 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 198 transitions. [2018-12-03 18:28:17,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-12-03 18:28:17,517 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:28:17,517 INFO L402 BasicCegarLoop]: trace histogram [98, 97, 1, 1] [2018-12-03 18:28:17,518 INFO L423 AbstractCegarLoop]: === Iteration 98 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:28:17,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:28:17,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1356251618, now seen corresponding path program 97 times [2018-12-03 18:28:17,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:28:17,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:28:17,519 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-12-03 18:28:17,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:28:17,519 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:28:17,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:28:21,354 INFO L134 CoverageAnalysis]: Checked inductivity of 9506 backedges. 0 proven. 9506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:28:21,354 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:28:21,354 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:28:21,355 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:28:21,355 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:28:21,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:28:21,355 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 18:28:21,364 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:28:21,364 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-12-03 18:28:21,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:28:21,414 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:28:26,170 INFO L134 CoverageAnalysis]: Checked inductivity of 9506 backedges. 0 proven. 9506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:28:26,170 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-12-03 18:28:37,005 INFO L134 CoverageAnalysis]: Checked inductivity of 9506 backedges. 0 proven. 9506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:28:37,024 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-12-03 18:28:37,024 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 294 [2018-12-03 18:28:37,024 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-12-03 18:28:37,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2018-12-03 18:28:37,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2018-12-03 18:28:37,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38907, Invalid=48413, Unknown=0, NotChecked=0, Total=87320 [2018-12-03 18:28:37,028 INFO L87 Difference]: Start difference. First operand 198 states and 198 transitions. Second operand 198 states. [2018-12-03 18:28:37,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-03 18:28:37,653 INFO L93 Difference]: Finished difference Result 201 states and 201 transitions. [2018-12-03 18:28:37,653 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-12-03 18:28:37,653 INFO L78 Accepts]: Start accepts. Automaton has 198 states. Word has length 197 [2018-12-03 18:28:37,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-03 18:28:37,654 INFO L225 Difference]: With dead ends: 201 [2018-12-03 18:28:37,654 INFO L226 Difference]: Without dead ends: 200 [2018-12-03 18:28:37,656 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 490 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 294 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38220 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=38907, Invalid=48413, Unknown=0, NotChecked=0, Total=87320 [2018-12-03 18:28:37,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2018-12-03 18:28:37,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2018-12-03 18:28:37,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2018-12-03 18:28:37,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 200 transitions. [2018-12-03 18:28:37,660 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 200 transitions. Word has length 197 [2018-12-03 18:28:37,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-03 18:28:37,660 INFO L480 AbstractCegarLoop]: Abstraction has 200 states and 200 transitions. [2018-12-03 18:28:37,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has 198 states. [2018-12-03 18:28:37,660 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 200 transitions. [2018-12-03 18:28:37,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-12-03 18:28:37,661 INFO L394 BasicCegarLoop]: Found error trace [2018-12-03 18:28:37,661 INFO L402 BasicCegarLoop]: trace histogram [99, 98, 1, 1] [2018-12-03 18:28:37,661 INFO L423 AbstractCegarLoop]: === Iteration 99 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-12-03 18:28:37,661 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-03 18:28:37,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1982715300, now seen corresponding path program 98 times [2018-12-03 18:28:37,661 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-03 18:28:37,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:28:37,662 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-03 18:28:37,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-03 18:28:37,662 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-03 18:28:37,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-03 18:28:41,592 INFO L134 CoverageAnalysis]: Checked inductivity of 9702 backedges. 0 proven. 9702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:28:41,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:28:41,593 INFO L192 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-12-03 18:28:41,593 INFO L187 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-12-03 18:28:41,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-12-03 18:28:41,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-03 18:28:41,593 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 18:28:41,605 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-12-03 18:28:41,605 INFO L286 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-12-03 18:28:41,732 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 99 check-sat command(s) [2018-12-03 18:28:41,732 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-12-03 18:28:41,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-03 18:28:46,540 INFO L134 CoverageAnalysis]: Checked inductivity of 9702 backedges. 0 proven. 9702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-03 18:28:46,541 INFO L316 TraceCheckSpWp]: Computing backward predicates...