java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-00a8621 [2018-09-30 10:26:57,741 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-30 10:26:57,748 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-30 10:26:57,764 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-30 10:26:57,764 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-30 10:26:57,765 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-30 10:26:57,767 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-30 10:26:57,770 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-30 10:26:57,772 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-30 10:26:57,774 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-30 10:26:57,775 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-30 10:26:57,777 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-30 10:26:57,778 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-30 10:26:57,780 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-30 10:26:57,781 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-30 10:26:57,787 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-30 10:26:57,788 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-30 10:26:57,793 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-30 10:26:57,798 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-30 10:26:57,802 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-30 10:26:57,804 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-30 10:26:57,807 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-30 10:26:57,812 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-30 10:26:57,812 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-30 10:26:57,812 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-30 10:26:57,816 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-30 10:26:57,819 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-30 10:26:57,820 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-30 10:26:57,821 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-30 10:26:57,825 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-30 10:26:57,825 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-30 10:26:57,826 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-30 10:26:57,826 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-30 10:26:57,827 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-30 10:26:57,830 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-30 10:26:57,831 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-30 10:26:57,832 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-30 10:26:57,858 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-30 10:26:57,859 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-30 10:26:57,860 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-30 10:26:57,860 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-30 10:26:57,861 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-30 10:26:57,861 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-30 10:26:57,862 INFO L133 SettingsManager]: * Use SBE=true [2018-09-30 10:26:57,863 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-30 10:26:57,863 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-30 10:26:57,863 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-30 10:26:57,863 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-30 10:26:57,863 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-30 10:26:57,864 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-30 10:26:57,864 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-30 10:26:57,864 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-30 10:26:57,864 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-30 10:26:57,865 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-30 10:26:57,865 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-30 10:26:57,865 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-30 10:26:57,866 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-30 10:26:57,866 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-30 10:26:57,866 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-30 10:26:57,866 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 10:26:57,867 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-30 10:26:57,867 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-30 10:26:57,867 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-30 10:26:57,867 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-30 10:26:57,867 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-30 10:26:57,868 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-30 10:26:57,868 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-30 10:26:57,924 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-30 10:26:57,937 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-30 10:26:57,941 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-30 10:26:57,943 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-30 10:26:57,943 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-30 10:26:57,944 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl [2018-09-30 10:26:57,945 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/nested1.i_4.bpl' [2018-09-30 10:26:58,007 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-30 10:26:58,011 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-30 10:26:58,011 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-30 10:26:58,012 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-30 10:26:58,012 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-30 10:26:58,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,047 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,054 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-30 10:26:58,055 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-30 10:26:58,055 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-30 10:26:58,055 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-30 10:26:58,066 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,066 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,067 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,069 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,073 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,075 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,076 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/1) ... [2018-09-30 10:26:58,078 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-30 10:26:58,079 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-30 10:26:58,079 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-30 10:26:58,079 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-30 10:26:58,080 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (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 [2018-09-30 10:26:58,146 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-30 10:26:58,146 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-30 10:26:58,369 INFO L348 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-30 10:26:58,370 INFO L202 PluginConnector]: Adding new model nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 10:26:58 BoogieIcfgContainer [2018-09-30 10:26:58,370 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-30 10:26:58,371 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-30 10:26:58,371 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-30 10:26:58,374 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-30 10:26:58,375 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 10:26:57" (1/2) ... [2018-09-30 10:26:58,376 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ff207f3 and model type nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.09 10:26:58, skipping insertion in model container [2018-09-30 10:26:58,376 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "nested1.i_4.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 10:26:58" (2/2) ... [2018-09-30 10:26:58,378 INFO L112 eAbstractionObserver]: Analyzing ICFG nested1.i_4.bpl [2018-09-30 10:26:58,388 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-30 10:26:58,396 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-30 10:26:58,446 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-30 10:26:58,447 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-30 10:26:58,448 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-30 10:26:58,448 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-30 10:26:58,448 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-30 10:26:58,448 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-30 10:26:58,448 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-30 10:26:58,449 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-30 10:26:58,449 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-30 10:26:58,465 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-30 10:26:58,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-30 10:26:58,472 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:26:58,473 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-30 10:26:58,474 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:26:58,480 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:26:58,481 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-30 10:26:58,487 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:26:58,488 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:26:58,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:26:58,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:26:58,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:26:58,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:26:58,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:26:58,662 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 10:26:58,662 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-30 10:26:58,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-30 10:26:58,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-30 10:26:58,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 10:26:58,684 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-30 10:26:58,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:26:58,766 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2018-09-30 10:26:58,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-30 10:26:58,768 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-30 10:26:58,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:26:58,779 INFO L225 Difference]: With dead ends: 17 [2018-09-30 10:26:58,779 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 10:26:58,782 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 10:26:58,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 10:26:58,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 9. [2018-09-30 10:26:58,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-30 10:26:58,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2018-09-30 10:26:58,819 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 4 [2018-09-30 10:26:58,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:26:58,819 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2018-09-30 10:26:58,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-30 10:26:58,820 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2018-09-30 10:26:58,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-30 10:26:58,820 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:26:58,820 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2018-09-30 10:26:58,821 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:26:58,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:26:58,821 INFO L82 PathProgramCache]: Analyzing trace with hash 209100445, now seen corresponding path program 1 times [2018-09-30 10:26:58,821 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:26:58,822 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:26:58,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:26:58,823 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:26:58,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:26:58,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:26:58,930 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:26:58,930 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 10:26:58,930 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-30 10:26:58,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-30 10:26:58,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-30 10:26:58,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 10:26:58,934 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand 3 states. [2018-09-30 10:26:58,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:26:58,997 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2018-09-30 10:26:58,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-30 10:26:58,998 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2018-09-30 10:26:58,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:26:58,999 INFO L225 Difference]: With dead ends: 17 [2018-09-30 10:26:58,999 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 10:26:59,000 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 10:26:59,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 10:26:59,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-30 10:26:59,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-30 10:26:59,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2018-09-30 10:26:59,005 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2018-09-30 10:26:59,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:26:59,005 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2018-09-30 10:26:59,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-30 10:26:59,006 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2018-09-30 10:26:59,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-30 10:26:59,006 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:26:59,006 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2018-09-30 10:26:59,007 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:26:59,007 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:26:59,007 INFO L82 PathProgramCache]: Analyzing trace with hash -850198025, now seen corresponding path program 1 times [2018-09-30 10:26:59,007 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:26:59,007 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:26:59,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:26:59,009 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:26:59,009 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:26:59,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:26:59,113 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:26:59,113 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:26:59,113 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:26:59,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:26:59,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:26:59,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:26:59,274 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 10:26:59,295 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:26:59,295 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2018-09-30 10:26:59,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-30 10:26:59,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-30 10:26:59,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-09-30 10:26:59,297 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 7 states. [2018-09-30 10:26:59,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:26:59,777 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2018-09-30 10:26:59,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 10:26:59,779 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2018-09-30 10:26:59,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:26:59,780 INFO L225 Difference]: With dead ends: 35 [2018-09-30 10:26:59,780 INFO L226 Difference]: Without dead ends: 27 [2018-09-30 10:26:59,781 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2018-09-30 10:26:59,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-30 10:26:59,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2018-09-30 10:26:59,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-30 10:26:59,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-09-30 10:26:59,793 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 10 [2018-09-30 10:26:59,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:26:59,793 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-09-30 10:26:59,793 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-30 10:26:59,794 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-09-30 10:26:59,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-30 10:26:59,794 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:26:59,795 INFO L375 BasicCegarLoop]: trace histogram [6, 4, 3, 2, 2, 1, 1, 1] [2018-09-30 10:26:59,795 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:26:59,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:26:59,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1881088987, now seen corresponding path program 2 times [2018-09-30 10:26:59,796 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:26:59,796 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:26:59,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:26:59,797 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:26:59,798 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:26:59,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:26:59,906 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-09-30 10:26:59,906 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:26:59,906 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:26:59,919 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 10:26:59,966 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 10:26:59,966 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:26:59,972 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:00,095 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-09-30 10:27:00,126 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:00,126 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 8 [2018-09-30 10:27:00,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-30 10:27:00,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-30 10:27:00,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-30 10:27:00,129 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 8 states. [2018-09-30 10:27:00,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:00,826 INFO L93 Difference]: Finished difference Result 55 states and 65 transitions. [2018-09-30 10:27:00,828 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-30 10:27:00,828 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-09-30 10:27:00,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:00,829 INFO L225 Difference]: With dead ends: 55 [2018-09-30 10:27:00,830 INFO L226 Difference]: Without dead ends: 43 [2018-09-30 10:27:00,833 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2018-09-30 10:27:00,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-30 10:27:00,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2018-09-30 10:27:00,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-30 10:27:00,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2018-09-30 10:27:00,848 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 20 [2018-09-30 10:27:00,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:00,848 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2018-09-30 10:27:00,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-30 10:27:00,849 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2018-09-30 10:27:00,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-30 10:27:00,850 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:00,850 INFO L375 BasicCegarLoop]: trace histogram [12, 9, 4, 3, 3, 1, 1, 1] [2018-09-30 10:27:00,850 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:00,851 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:00,851 INFO L82 PathProgramCache]: Analyzing trace with hash 501354739, now seen corresponding path program 3 times [2018-09-30 10:27:00,851 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:00,851 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:00,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:00,853 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:00,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:00,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:01,024 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2018-09-30 10:27:01,025 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:01,025 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:01,037 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 10:27:01,063 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-09-30 10:27:01,064 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:01,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:01,094 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 70 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2018-09-30 10:27:01,116 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:01,116 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-30 10:27:01,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-30 10:27:01,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-30 10:27:01,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 10:27:01,117 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 6 states. [2018-09-30 10:27:01,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:01,190 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2018-09-30 10:27:01,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-30 10:27:01,190 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-09-30 10:27:01,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:01,191 INFO L225 Difference]: With dead ends: 65 [2018-09-30 10:27:01,192 INFO L226 Difference]: Without dead ends: 41 [2018-09-30 10:27:01,192 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 10:27:01,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-30 10:27:01,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-30 10:27:01,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-30 10:27:01,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-09-30 10:27:01,202 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 34 [2018-09-30 10:27:01,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:01,202 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-09-30 10:27:01,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-30 10:27:01,203 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-09-30 10:27:01,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-30 10:27:01,204 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:01,204 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 4, 3, 3, 1, 1, 1] [2018-09-30 10:27:01,204 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:01,204 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:01,205 INFO L82 PathProgramCache]: Analyzing trace with hash 209827969, now seen corresponding path program 4 times [2018-09-30 10:27:01,205 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:01,205 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:01,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:01,206 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:01,206 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:01,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:01,474 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-09-30 10:27:01,475 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:01,475 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:01,483 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 10:27:01,503 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 10:27:01,503 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:01,506 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:01,664 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-09-30 10:27:01,694 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:01,695 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9] total 9 [2018-09-30 10:27:01,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 10:27:01,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 10:27:01,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-09-30 10:27:01,696 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-09-30 10:27:01,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:01,852 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2018-09-30 10:27:01,855 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 10:27:01,855 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2018-09-30 10:27:01,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:01,857 INFO L225 Difference]: With dead ends: 65 [2018-09-30 10:27:01,857 INFO L226 Difference]: Without dead ends: 63 [2018-09-30 10:27:01,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2018-09-30 10:27:01,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-30 10:27:01,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 53. [2018-09-30 10:27:01,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-30 10:27:01,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2018-09-30 10:27:01,879 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 40 [2018-09-30 10:27:01,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:01,884 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2018-09-30 10:27:01,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 10:27:01,884 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2018-09-30 10:27:01,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-30 10:27:01,886 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:01,886 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 5, 4, 4, 1, 1, 1] [2018-09-30 10:27:01,886 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:01,886 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:01,887 INFO L82 PathProgramCache]: Analyzing trace with hash -1874565441, now seen corresponding path program 5 times [2018-09-30 10:27:01,887 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:01,887 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:01,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:01,890 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:01,890 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:01,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:02,358 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 320 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2018-09-30 10:27:02,359 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:02,359 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:02,375 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 10:27:02,406 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-30 10:27:02,406 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:02,411 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:02,552 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 262 proven. 20 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2018-09-30 10:27:02,574 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:02,574 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2018-09-30 10:27:02,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-30 10:27:02,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-30 10:27:02,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-30 10:27:02,576 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 12 states. [2018-09-30 10:27:03,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:03,732 INFO L93 Difference]: Finished difference Result 127 states and 143 transitions. [2018-09-30 10:27:03,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-09-30 10:27:03,733 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2018-09-30 10:27:03,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:03,734 INFO L225 Difference]: With dead ends: 127 [2018-09-30 10:27:03,735 INFO L226 Difference]: Without dead ends: 87 [2018-09-30 10:27:03,736 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=121, Invalid=1211, Unknown=0, NotChecked=0, Total=1332 [2018-09-30 10:27:03,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-09-30 10:27:03,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 75. [2018-09-30 10:27:03,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-09-30 10:27:03,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2018-09-30 10:27:03,754 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 52 [2018-09-30 10:27:03,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:03,755 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2018-09-30 10:27:03,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-30 10:27:03,755 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2018-09-30 10:27:03,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-09-30 10:27:03,757 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:03,758 INFO L375 BasicCegarLoop]: trace histogram [30, 25, 6, 5, 5, 1, 1, 1] [2018-09-30 10:27:03,758 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:03,758 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:03,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1734028097, now seen corresponding path program 6 times [2018-09-30 10:27:03,759 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:03,759 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:03,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:03,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:03,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:03,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:04,171 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-09-30 10:27:04,171 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:04,172 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:04,181 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 10:27:04,281 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2018-09-30 10:27:04,281 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:04,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:04,540 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 520 proven. 30 refuted. 0 times theorem prover too weak. 350 trivial. 0 not checked. [2018-09-30 10:27:04,561 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:04,562 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2018-09-30 10:27:04,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-30 10:27:04,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-30 10:27:04,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-30 10:27:04,563 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand 14 states. [2018-09-30 10:27:06,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:06,101 INFO L93 Difference]: Finished difference Result 175 states and 194 transitions. [2018-09-30 10:27:06,102 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-09-30 10:27:06,102 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 74 [2018-09-30 10:27:06,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:06,103 INFO L225 Difference]: With dead ends: 175 [2018-09-30 10:27:06,104 INFO L226 Difference]: Without dead ends: 115 [2018-09-30 10:27:06,108 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=169, Invalid=2281, Unknown=0, NotChecked=0, Total=2450 [2018-09-30 10:27:06,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-09-30 10:27:06,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 101. [2018-09-30 10:27:06,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-09-30 10:27:06,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 107 transitions. [2018-09-30 10:27:06,134 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 107 transitions. Word has length 74 [2018-09-30 10:27:06,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:06,135 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 107 transitions. [2018-09-30 10:27:06,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-30 10:27:06,135 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 107 transitions. [2018-09-30 10:27:06,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2018-09-30 10:27:06,137 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:06,137 INFO L375 BasicCegarLoop]: trace histogram [42, 36, 7, 6, 6, 1, 1, 1] [2018-09-30 10:27:06,138 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:06,138 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:06,138 INFO L82 PathProgramCache]: Analyzing trace with hash 883432563, now seen corresponding path program 7 times [2018-09-30 10:27:06,138 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:06,139 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:06,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:06,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:06,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:06,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:06,803 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1512 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2018-09-30 10:27:06,804 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:06,804 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:06,812 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:27:06,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:06,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:07,199 WARN L178 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2018-09-30 10:27:07,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1554 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2018-09-30 10:27:07,426 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:07,426 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14] total 14 [2018-09-30 10:27:07,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-30 10:27:07,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-30 10:27:07,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2018-09-30 10:27:07,427 INFO L87 Difference]: Start difference. First operand 101 states and 107 transitions. Second operand 15 states. [2018-09-30 10:27:07,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:07,815 INFO L93 Difference]: Finished difference Result 133 states and 141 transitions. [2018-09-30 10:27:07,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-30 10:27:07,815 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 100 [2018-09-30 10:27:07,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:07,818 INFO L225 Difference]: With dead ends: 133 [2018-09-30 10:27:07,818 INFO L226 Difference]: Without dead ends: 131 [2018-09-30 10:27:07,819 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2018-09-30 10:27:07,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2018-09-30 10:27:07,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 117. [2018-09-30 10:27:07,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-09-30 10:27:07,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 124 transitions. [2018-09-30 10:27:07,843 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 124 transitions. Word has length 100 [2018-09-30 10:27:07,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:07,844 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 124 transitions. [2018-09-30 10:27:07,844 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-30 10:27:07,844 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 124 transitions. [2018-09-30 10:27:07,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-09-30 10:27:07,846 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:07,846 INFO L375 BasicCegarLoop]: trace histogram [49, 42, 8, 7, 7, 1, 1, 1] [2018-09-30 10:27:07,846 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:07,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:07,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1346298395, now seen corresponding path program 8 times [2018-09-30 10:27:07,847 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:07,847 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:07,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:07,848 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:27:07,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:07,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:08,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2408 backedges. 0 proven. 2114 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-09-30 10:27:08,058 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:08,058 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:08,070 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 10:27:08,112 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 10:27:08,113 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:08,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:08,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2408 backedges. 0 proven. 2114 refuted. 0 times theorem prover too weak. 294 trivial. 0 not checked. [2018-09-30 10:27:08,239 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:08,240 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-30 10:27:08,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 10:27:08,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 10:27:08,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 10:27:08,241 INFO L87 Difference]: Start difference. First operand 117 states and 124 transitions. Second operand 10 states. [2018-09-30 10:27:08,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:08,680 INFO L93 Difference]: Finished difference Result 149 states and 158 transitions. [2018-09-30 10:27:08,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 10:27:08,680 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 116 [2018-09-30 10:27:08,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:08,682 INFO L225 Difference]: With dead ends: 149 [2018-09-30 10:27:08,682 INFO L226 Difference]: Without dead ends: 147 [2018-09-30 10:27:08,683 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 115 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 10:27:08,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-09-30 10:27:08,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 133. [2018-09-30 10:27:08,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-09-30 10:27:08,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 141 transitions. [2018-09-30 10:27:08,721 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 141 transitions. Word has length 116 [2018-09-30 10:27:08,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:08,722 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 141 transitions. [2018-09-30 10:27:08,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 10:27:08,722 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 141 transitions. [2018-09-30 10:27:08,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-09-30 10:27:08,724 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:08,724 INFO L375 BasicCegarLoop]: trace histogram [56, 48, 9, 8, 8, 1, 1, 1] [2018-09-30 10:27:08,725 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:08,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:08,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1851587415, now seen corresponding path program 9 times [2018-09-30 10:27:08,725 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:08,725 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:08,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:08,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:08,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:08,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:09,026 INFO L134 CoverageAnalysis]: Checked inductivity of 3152 backedges. 0 proven. 2816 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2018-09-30 10:27:09,026 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:09,026 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:09,034 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 10:27:09,095 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-09-30 10:27:09,095 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:09,101 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:09,245 INFO L134 CoverageAnalysis]: Checked inductivity of 3152 backedges. 702 proven. 42 refuted. 0 times theorem prover too weak. 2408 trivial. 0 not checked. [2018-09-30 10:27:09,278 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:09,278 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 18 [2018-09-30 10:27:09,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-30 10:27:09,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-30 10:27:09,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-30 10:27:09,281 INFO L87 Difference]: Start difference. First operand 133 states and 141 transitions. Second operand 18 states. [2018-09-30 10:27:12,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:12,193 INFO L93 Difference]: Finished difference Result 299 states and 327 transitions. [2018-09-30 10:27:12,194 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-09-30 10:27:12,194 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 132 [2018-09-30 10:27:12,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:12,195 INFO L225 Difference]: With dead ends: 299 [2018-09-30 10:27:12,195 INFO L226 Difference]: Without dead ends: 183 [2018-09-30 10:27:12,199 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1953 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=285, Invalid=6195, Unknown=0, NotChecked=0, Total=6480 [2018-09-30 10:27:12,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2018-09-30 10:27:12,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 167. [2018-09-30 10:27:12,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-09-30 10:27:12,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 176 transitions. [2018-09-30 10:27:12,238 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 176 transitions. Word has length 132 [2018-09-30 10:27:12,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:12,238 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 176 transitions. [2018-09-30 10:27:12,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-30 10:27:12,241 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 176 transitions. [2018-09-30 10:27:12,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-09-30 10:27:12,248 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:12,248 INFO L375 BasicCegarLoop]: trace histogram [72, 63, 10, 9, 9, 1, 1, 1] [2018-09-30 10:27:12,249 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:12,249 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:12,249 INFO L82 PathProgramCache]: Analyzing trace with hash -132347917, now seen corresponding path program 10 times [2018-09-30 10:27:12,249 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:12,249 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:12,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:12,250 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:12,250 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:12,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:12,571 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 0 proven. 4698 refuted. 0 times theorem prover too weak. 504 trivial. 0 not checked. [2018-09-30 10:27:12,571 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:12,571 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:12,582 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 10:27:12,651 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 10:27:12,651 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:12,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:12,821 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 1952 proven. 56 refuted. 0 times theorem prover too weak. 3194 trivial. 0 not checked. [2018-09-30 10:27:12,842 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:12,842 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 20 [2018-09-30 10:27:12,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-30 10:27:12,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-30 10:27:12,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-30 10:27:12,843 INFO L87 Difference]: Start difference. First operand 167 states and 176 transitions. Second operand 20 states. [2018-09-30 10:27:15,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:15,196 INFO L93 Difference]: Finished difference Result 371 states and 402 transitions. [2018-09-30 10:27:15,199 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-09-30 10:27:15,200 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 166 [2018-09-30 10:27:15,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:15,201 INFO L225 Difference]: With dead ends: 371 [2018-09-30 10:27:15,201 INFO L226 Difference]: Without dead ends: 223 [2018-09-30 10:27:15,204 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3160 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=357, Invalid=9543, Unknown=0, NotChecked=0, Total=9900 [2018-09-30 10:27:15,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-09-30 10:27:15,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 205. [2018-09-30 10:27:15,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2018-09-30 10:27:15,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 215 transitions. [2018-09-30 10:27:15,230 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 215 transitions. Word has length 166 [2018-09-30 10:27:15,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:15,230 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 215 transitions. [2018-09-30 10:27:15,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-30 10:27:15,231 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 215 transitions. [2018-09-30 10:27:15,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-09-30 10:27:15,233 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:15,233 INFO L375 BasicCegarLoop]: trace histogram [90, 80, 11, 10, 10, 1, 1, 1] [2018-09-30 10:27:15,234 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:15,234 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:15,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1568317117, now seen corresponding path program 11 times [2018-09-30 10:27:15,234 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:15,234 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:15,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:15,235 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:15,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:15,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:15,830 INFO L134 CoverageAnalysis]: Checked inductivity of 8120 backedges. 0 proven. 7400 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2018-09-30 10:27:15,831 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:15,831 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:15,838 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 10:27:16,051 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2018-09-30 10:27:16,052 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:16,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:16,287 INFO L134 CoverageAnalysis]: Checked inductivity of 8120 backedges. 3774 proven. 72 refuted. 0 times theorem prover too weak. 4274 trivial. 0 not checked. [2018-09-30 10:27:16,308 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:16,308 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 22 [2018-09-30 10:27:16,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-30 10:27:16,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-30 10:27:16,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-30 10:27:16,310 INFO L87 Difference]: Start difference. First operand 205 states and 215 transitions. Second operand 22 states. [2018-09-30 10:27:19,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:19,786 INFO L93 Difference]: Finished difference Result 451 states and 485 transitions. [2018-09-30 10:27:19,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2018-09-30 10:27:19,787 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 204 [2018-09-30 10:27:19,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:19,789 INFO L225 Difference]: With dead ends: 451 [2018-09-30 10:27:19,789 INFO L226 Difference]: Without dead ends: 267 [2018-09-30 10:27:19,795 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4851 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=437, Invalid=14083, Unknown=0, NotChecked=0, Total=14520 [2018-09-30 10:27:19,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-09-30 10:27:19,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 247. [2018-09-30 10:27:19,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-09-30 10:27:19,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 258 transitions. [2018-09-30 10:27:19,826 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 258 transitions. Word has length 204 [2018-09-30 10:27:19,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:19,827 INFO L480 AbstractCegarLoop]: Abstraction has 247 states and 258 transitions. [2018-09-30 10:27:19,827 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-30 10:27:19,827 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 258 transitions. [2018-09-30 10:27:19,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-09-30 10:27:19,830 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:19,830 INFO L375 BasicCegarLoop]: trace histogram [110, 99, 12, 11, 11, 1, 1, 1] [2018-09-30 10:27:19,830 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:19,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:19,831 INFO L82 PathProgramCache]: Analyzing trace with hash 915329223, now seen corresponding path program 12 times [2018-09-30 10:27:19,831 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:19,831 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:19,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:19,832 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:19,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:19,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:20,729 INFO L134 CoverageAnalysis]: Checked inductivity of 12122 backedges. 0 proven. 11132 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2018-09-30 10:27:20,729 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:20,729 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:20,739 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 10:27:25,555 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2018-09-30 10:27:25,555 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:25,575 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:26,076 INFO L134 CoverageAnalysis]: Checked inductivity of 12122 backedges. 2022 proven. 90 refuted. 0 times theorem prover too weak. 10010 trivial. 0 not checked. [2018-09-30 10:27:26,096 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:26,097 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2018-09-30 10:27:26,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-30 10:27:26,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-30 10:27:26,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-30 10:27:26,098 INFO L87 Difference]: Start difference. First operand 247 states and 258 transitions. Second operand 24 states. [2018-09-30 10:27:30,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:30,328 INFO L93 Difference]: Finished difference Result 539 states and 576 transitions. [2018-09-30 10:27:30,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2018-09-30 10:27:30,329 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 246 [2018-09-30 10:27:30,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:30,330 INFO L225 Difference]: With dead ends: 539 [2018-09-30 10:27:30,331 INFO L226 Difference]: Without dead ends: 315 [2018-09-30 10:27:30,336 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7140 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=525, Invalid=20067, Unknown=0, NotChecked=0, Total=20592 [2018-09-30 10:27:30,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2018-09-30 10:27:30,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 293. [2018-09-30 10:27:30,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 293 states. [2018-09-30 10:27:30,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 305 transitions. [2018-09-30 10:27:30,376 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 305 transitions. Word has length 246 [2018-09-30 10:27:30,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:30,376 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 305 transitions. [2018-09-30 10:27:30,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-30 10:27:30,376 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 305 transitions. [2018-09-30 10:27:30,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2018-09-30 10:27:30,380 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:30,381 INFO L375 BasicCegarLoop]: trace histogram [132, 120, 13, 12, 12, 1, 1, 1] [2018-09-30 10:27:30,381 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:30,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:30,381 INFO L82 PathProgramCache]: Analyzing trace with hash 154612223, now seen corresponding path program 13 times [2018-09-30 10:27:30,381 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:30,382 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:30,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:30,383 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:30,383 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:30,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:31,044 INFO L134 CoverageAnalysis]: Checked inductivity of 17448 backedges. 0 proven. 16128 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-09-30 10:27:31,045 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:31,045 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:31,052 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:27:31,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:31,157 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:31,326 INFO L134 CoverageAnalysis]: Checked inductivity of 17448 backedges. 0 proven. 16128 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2018-09-30 10:27:31,356 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:31,356 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-30 10:27:31,357 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-30 10:27:31,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-30 10:27:31,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-30 10:27:31,358 INFO L87 Difference]: Start difference. First operand 293 states and 305 transitions. Second operand 15 states. [2018-09-30 10:27:31,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:31,738 INFO L93 Difference]: Finished difference Result 341 states and 355 transitions. [2018-09-30 10:27:31,738 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-30 10:27:31,738 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 292 [2018-09-30 10:27:31,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:31,740 INFO L225 Difference]: With dead ends: 341 [2018-09-30 10:27:31,740 INFO L226 Difference]: Without dead ends: 339 [2018-09-30 10:27:31,740 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 291 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-30 10:27:31,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-09-30 10:27:31,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 317. [2018-09-30 10:27:31,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-09-30 10:27:31,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 330 transitions. [2018-09-30 10:27:31,783 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 330 transitions. Word has length 292 [2018-09-30 10:27:31,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:31,784 INFO L480 AbstractCegarLoop]: Abstraction has 317 states and 330 transitions. [2018-09-30 10:27:31,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-30 10:27:31,784 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 330 transitions. [2018-09-30 10:27:31,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-09-30 10:27:31,786 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:31,786 INFO L375 BasicCegarLoop]: trace histogram [143, 130, 14, 13, 13, 1, 1, 1] [2018-09-30 10:27:31,786 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:31,786 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:31,787 INFO L82 PathProgramCache]: Analyzing trace with hash -114885159, now seen corresponding path program 14 times [2018-09-30 10:27:31,787 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:31,787 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:31,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:31,788 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 10:27:31,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:31,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:32,776 INFO L134 CoverageAnalysis]: Checked inductivity of 20488 backedges. 0 proven. 19058 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-09-30 10:27:32,776 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:32,776 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:32,789 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 10:27:32,894 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 10:27:32,894 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 10:27:32,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 10:27:33,079 INFO L134 CoverageAnalysis]: Checked inductivity of 20488 backedges. 0 proven. 19058 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2018-09-30 10:27:33,101 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 10:27:33,101 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-30 10:27:33,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-30 10:27:33,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-30 10:27:33,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-30 10:27:33,102 INFO L87 Difference]: Start difference. First operand 317 states and 330 transitions. Second operand 16 states. [2018-09-30 10:27:33,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 10:27:33,448 INFO L93 Difference]: Finished difference Result 365 states and 380 transitions. [2018-09-30 10:27:33,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-30 10:27:33,448 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 316 [2018-09-30 10:27:33,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 10:27:33,450 INFO L225 Difference]: With dead ends: 365 [2018-09-30 10:27:33,451 INFO L226 Difference]: Without dead ends: 363 [2018-09-30 10:27:33,451 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 315 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-30 10:27:33,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 363 states. [2018-09-30 10:27:33,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 363 to 341. [2018-09-30 10:27:33,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2018-09-30 10:27:33,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 355 transitions. [2018-09-30 10:27:33,499 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 355 transitions. Word has length 316 [2018-09-30 10:27:33,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 10:27:33,500 INFO L480 AbstractCegarLoop]: Abstraction has 341 states and 355 transitions. [2018-09-30 10:27:33,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-30 10:27:33,500 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 355 transitions. [2018-09-30 10:27:33,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2018-09-30 10:27:33,502 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 10:27:33,502 INFO L375 BasicCegarLoop]: trace histogram [154, 140, 15, 14, 14, 1, 1, 1] [2018-09-30 10:27:33,503 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 10:27:33,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 10:27:33,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1438164045, now seen corresponding path program 15 times [2018-09-30 10:27:33,503 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 10:27:33,503 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 10:27:33,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:33,504 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 10:27:33,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 10:27:33,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 10:27:34,081 INFO L134 CoverageAnalysis]: Checked inductivity of 23772 backedges. 0 proven. 22232 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-09-30 10:27:34,081 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 10:27:34,081 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP 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 [2018-09-30 10:27:34,088 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown