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/functions1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2eb0a67 [2018-10-03 08:43:40,462 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-03 08:43:40,465 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-03 08:43:40,476 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-03 08:43:40,476 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-03 08:43:40,477 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-03 08:43:40,479 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-03 08:43:40,481 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-03 08:43:40,482 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-03 08:43:40,483 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-03 08:43:40,484 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-10-03 08:43:40,520 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 [2018-10-03 08:43:40,550 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-03 08:43:40,550 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-03 08:43:40,551 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-03 08:43:40,552 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-03 08:43:40,553 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-03 08:43:40,553 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-03 08:43:40,553 INFO L133 SettingsManager]: * Use SBE=true [2018-10-03 08:43:40,553 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-03 08:43:40,554 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-03 08:43:40,554 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-03 08:43:40,554 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-03 08:43:40,554 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-03 08:43:40,556 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-03 08:43:40,556 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-03 08:43:40,556 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-03 08:43:40,556 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-03 08:43:40,556 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-03 08:43:40,557 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-03 08:43:40,557 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-03 08:43:40,557 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-03 08:43:40,557 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-03 08:43:40,557 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-03 08:43:40,558 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-03 08:43:40,558 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-03 08:43:40,558 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-03 08:43:40,558 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-03 08:43:40,559 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-03 08:43:40,559 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-03 08:43:40,559 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-03 08:43:40,559 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-03 08:43:40,616 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-03 08:43:40,628 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-03 08:43:40,632 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-03 08:43:40,634 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-03 08:43:40,634 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-03 08:43:40,635 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl [2018-10-03 08:43:40,635 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl' [2018-10-03 08:43:40,691 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-03 08:43:40,695 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-03 08:43:40,695 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-03 08:43:40,696 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-03 08:43:40,696 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-03 08:43:40,716 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,729 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,735 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-03 08:43:40,737 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-03 08:43:40,737 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-03 08:43:40,737 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-03 08:43:40,748 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,748 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,749 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,750 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,753 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,755 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,756 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/1) ... [2018-10-03 08:43:40,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-03 08:43:40,758 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-03 08:43:40,758 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-03 08:43:40,758 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-03 08:43:40,759 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (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 [2018-10-03 08:43:40,825 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-03 08:43:40,826 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-03 08:43:41,043 INFO L340 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-03 08:43:41,044 INFO L202 PluginConnector]: Adding new model functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.10 08:43:41 BoogieIcfgContainer [2018-10-03 08:43:41,044 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-03 08:43:41,045 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-03 08:43:41,045 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-03 08:43:41,049 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-03 08:43:41,049 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 03.10 08:43:40" (1/2) ... [2018-10-03 08:43:41,050 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6656b3e6 and model type functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.10 08:43:41, skipping insertion in model container [2018-10-03 08:43:41,051 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.10 08:43:41" (2/2) ... [2018-10-03 08:43:41,053 INFO L112 eAbstractionObserver]: Analyzing ICFG functions1.i_3.bpl [2018-10-03 08:43:41,063 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-03 08:43:41,072 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-03 08:43:41,132 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-03 08:43:41,133 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-03 08:43:41,133 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-03 08:43:41,133 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-03 08:43:41,134 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-03 08:43:41,134 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-03 08:43:41,134 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-03 08:43:41,134 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-03 08:43:41,134 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-03 08:43:41,151 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-10-03 08:43:41,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-03 08:43:41,158 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:41,159 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-03 08:43:41,160 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:41,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:41,167 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-10-03 08:43:41,169 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:41,170 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:41,228 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:41,228 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-03 08:43:41,229 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:41,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:41,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:41,421 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-03 08:43:41,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-03 08:43:41,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-03 08:43:41,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-03 08:43:41,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-03 08:43:41,441 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-10-03 08:43:41,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:41,496 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-10-03 08:43:41,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-03 08:43:41,498 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-10-03 08:43:41,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:41,511 INFO L225 Difference]: With dead ends: 11 [2018-10-03 08:43:41,512 INFO L226 Difference]: Without dead ends: 7 [2018-10-03 08:43:41,516 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 [2018-10-03 08:43:41,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-03 08:43:41,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-03 08:43:41,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-03 08:43:41,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-03 08:43:41,557 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-10-03 08:43:41,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:41,558 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-03 08:43:41,558 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-03 08:43:41,558 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-03 08:43:41,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-03 08:43:41,559 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:41,559 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-10-03 08:43:41,559 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:41,559 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:41,560 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-10-03 08:43:41,560 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:41,560 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:41,561 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:41,561 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-03 08:43:41,562 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:41,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:41,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:41,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:41,769 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 [2018-10-03 08:43:41,786 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-03 08:43:41,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:41,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:43:41,907 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:41,930 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:43:41,930 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-10-03 08:43:41,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-03 08:43:41,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-03 08:43:41,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-03 08:43:41,933 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-10-03 08:43:41,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:41,974 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-03 08:43:41,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-03 08:43:41,975 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-10-03 08:43:41,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:41,976 INFO L225 Difference]: With dead ends: 11 [2018-10-03 08:43:41,976 INFO L226 Difference]: Without dead ends: 9 [2018-10-03 08:43:41,977 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-03 08:43:41,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-03 08:43:41,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-03 08:43:41,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-03 08:43:41,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-03 08:43:41,981 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-03 08:43:41,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:41,981 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-03 08:43:41,982 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-03 08:43:41,982 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-03 08:43:41,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-03 08:43:41,982 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:41,982 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-10-03 08:43:41,983 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:41,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:41,983 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-10-03 08:43:41,983 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:41,984 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:41,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:41,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-03 08:43:41,985 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:42,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:42,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:42,171 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:42,171 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 [2018-10-03 08:43:42,185 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-03 08:43:42,209 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-03 08:43:42,209 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:43:42,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:43:42,231 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:42,252 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:43:42,253 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-03 08:43:42,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-03 08:43:42,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-03 08:43:42,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-03 08:43:42,254 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-10-03 08:43:42,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:42,334 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-03 08:43:42,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-03 08:43:42,334 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-10-03 08:43:42,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:42,335 INFO L225 Difference]: With dead ends: 13 [2018-10-03 08:43:42,335 INFO L226 Difference]: Without dead ends: 11 [2018-10-03 08:43:42,336 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-03 08:43:42,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-03 08:43:42,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-03 08:43:42,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-03 08:43:42,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-03 08:43:42,342 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-10-03 08:43:42,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:42,343 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-03 08:43:42,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-03 08:43:42,343 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-03 08:43:42,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-03 08:43:42,344 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:42,344 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-10-03 08:43:42,345 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:42,345 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:42,345 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-10-03 08:43:42,346 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:42,346 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:42,349 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:42,349 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:43:42,350 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:42,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:42,737 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:42,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:42,738 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 [2018-10-03 08:43:42,748 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-03 08:43:42,803 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-03 08:43:42,804 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:43:42,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:43:42,823 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:42,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:43:42,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-03 08:43:42,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-03 08:43:42,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-03 08:43:42,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-03 08:43:42,849 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-10-03 08:43:42,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:42,909 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-03 08:43:42,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-03 08:43:42,910 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-10-03 08:43:42,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:42,911 INFO L225 Difference]: With dead ends: 15 [2018-10-03 08:43:42,912 INFO L226 Difference]: Without dead ends: 13 [2018-10-03 08:43:42,913 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-03 08:43:42,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-03 08:43:42,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-03 08:43:42,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-03 08:43:42,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-03 08:43:42,918 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-03 08:43:42,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:42,918 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-03 08:43:42,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-03 08:43:42,918 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-03 08:43:42,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-03 08:43:42,919 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:42,919 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-10-03 08:43:42,920 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:42,920 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:42,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-10-03 08:43:42,920 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:42,921 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:42,921 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:42,922 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:43:42,922 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:42,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:43,167 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:43,167 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:43,168 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 [2018-10-03 08:43:43,183 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-03 08:43:43,200 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-03 08:43:43,201 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:43:43,203 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:43:43,225 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:43,246 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:43:43,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-03 08:43:43,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-03 08:43:43,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-03 08:43:43,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-03 08:43:43,248 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-10-03 08:43:43,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:43,305 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-03 08:43:43,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-03 08:43:43,306 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-10-03 08:43:43,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:43,308 INFO L225 Difference]: With dead ends: 17 [2018-10-03 08:43:43,308 INFO L226 Difference]: Without dead ends: 15 [2018-10-03 08:43:43,309 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-03 08:43:43,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-03 08:43:43,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-03 08:43:43,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-03 08:43:43,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-03 08:43:43,314 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-03 08:43:43,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:43,315 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-03 08:43:43,315 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-03 08:43:43,315 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-03 08:43:43,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-03 08:43:43,316 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:43,316 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-10-03 08:43:43,316 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:43,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:43,317 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-10-03 08:43:43,317 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:43,317 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:43,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:43,318 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:43:43,318 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:43,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:43,502 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:43,503 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:43,503 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 [2018-10-03 08:43:43,512 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-03 08:43:43,847 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-03 08:43:43,847 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:43:43,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:43:43,878 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:43,909 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:43:43,909 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-03 08:43:43,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-03 08:43:43,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-03 08:43:43,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-03 08:43:43,911 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-10-03 08:43:44,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:44,279 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-03 08:43:44,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-03 08:43:44,282 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-10-03 08:43:44,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:44,282 INFO L225 Difference]: With dead ends: 19 [2018-10-03 08:43:44,283 INFO L226 Difference]: Without dead ends: 17 [2018-10-03 08:43:44,285 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-03 08:43:44,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-03 08:43:44,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-03 08:43:44,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-03 08:43:44,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-03 08:43:44,292 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-10-03 08:43:44,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:44,298 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-03 08:43:44,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-03 08:43:44,298 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-03 08:43:44,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-03 08:43:44,299 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:44,299 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-10-03 08:43:44,300 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:44,300 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:44,300 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-10-03 08:43:44,300 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:44,304 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:44,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:44,306 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:43:44,306 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:44,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:44,730 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:44,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:44,731 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 [2018-10-03 08:43:44,745 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-03 08:43:44,775 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-03 08:43:44,775 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:43:44,779 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:43:44,834 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:44,856 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:43:44,856 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-03 08:43:44,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-03 08:43:44,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-03 08:43:44,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-03 08:43:44,857 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-03 08:43:44,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:44,958 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-03 08:43:44,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-03 08:43:44,962 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-03 08:43:44,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:44,963 INFO L225 Difference]: With dead ends: 21 [2018-10-03 08:43:44,963 INFO L226 Difference]: Without dead ends: 19 [2018-10-03 08:43:44,963 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-03 08:43:44,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-03 08:43:44,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-03 08:43:44,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-03 08:43:44,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-03 08:43:44,969 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-10-03 08:43:44,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:44,969 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-03 08:43:44,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-03 08:43:44,969 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-03 08:43:44,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-03 08:43:44,970 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:44,970 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-10-03 08:43:44,970 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:44,971 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:44,971 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-10-03 08:43:44,971 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:44,971 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:44,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:44,973 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:43:44,973 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:44,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:45,554 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:45,555 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:45,555 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 [2018-10-03 08:43:45,563 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-03 08:43:45,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:45,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:43:45,608 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:45,631 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:43:45,631 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-03 08:43:45,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-03 08:43:45,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-03 08:43:45,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-03 08:43:45,632 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-10-03 08:43:45,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:45,766 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-03 08:43:45,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-03 08:43:45,768 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-10-03 08:43:45,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:45,769 INFO L225 Difference]: With dead ends: 23 [2018-10-03 08:43:45,769 INFO L226 Difference]: Without dead ends: 21 [2018-10-03 08:43:45,770 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-03 08:43:45,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-03 08:43:45,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-03 08:43:45,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-03 08:43:45,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-03 08:43:45,775 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-10-03 08:43:45,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:45,775 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-03 08:43:45,775 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-03 08:43:45,776 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-03 08:43:45,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-03 08:43:45,776 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:45,776 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-10-03 08:43:45,777 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:45,777 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:45,777 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-10-03 08:43:45,777 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:45,777 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:45,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:45,778 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-03 08:43:45,778 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:45,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:46,111 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:46,112 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:46,112 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 [2018-10-03 08:43:46,123 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-03 08:43:46,170 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-03 08:43:46,171 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:43:46,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:43:46,201 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:46,225 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:43:46,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-03 08:43:46,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-03 08:43:46,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-03 08:43:46,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-03 08:43:46,227 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-10-03 08:43:46,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:43:46,362 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-03 08:43:46,362 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-03 08:43:46,362 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-10-03 08:43:46,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:43:46,364 INFO L225 Difference]: With dead ends: 25 [2018-10-03 08:43:46,364 INFO L226 Difference]: Without dead ends: 23 [2018-10-03 08:43:46,365 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-03 08:43:46,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-03 08:43:46,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-03 08:43:46,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-03 08:43:46,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-03 08:43:46,370 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-10-03 08:43:46,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:43:46,370 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-03 08:43:46,370 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-03 08:43:46,371 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-03 08:43:46,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-03 08:43:46,371 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:43:46,372 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-10-03 08:43:46,372 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:43:46,372 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:43:46,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-10-03 08:43:46,372 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:43:46,373 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:43:46,373 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:46,374 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:43:46,374 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:43:46,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:43:46,703 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:43:46,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:43:46,705 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 [2018-10-03 08:43:46,714 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-03 08:44:06,460 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-03 08:44:06,461 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:44:06,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:44:06,523 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:44:06,546 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:44:06,546 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-03 08:44:06,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-03 08:44:06,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-03 08:44:06,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-03 08:44:06,547 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-10-03 08:44:06,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:44:06,688 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-03 08:44:06,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-03 08:44:06,689 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-10-03 08:44:06,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:44:06,689 INFO L225 Difference]: With dead ends: 27 [2018-10-03 08:44:06,689 INFO L226 Difference]: Without dead ends: 25 [2018-10-03 08:44:06,690 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-03 08:44:06,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-03 08:44:06,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-03 08:44:06,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-03 08:44:06,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-03 08:44:06,696 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-10-03 08:44:06,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:44:06,696 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-03 08:44:06,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-03 08:44:06,697 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-03 08:44:06,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-03 08:44:06,697 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:44:06,698 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-10-03 08:44:06,698 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:44:06,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:44:06,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-10-03 08:44:06,698 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:44:06,698 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:44:06,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:44:06,699 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:44:06,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:44:06,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:44:06,903 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:44:06,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:44:06,903 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 [2018-10-03 08:44:06,912 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-03 08:44:06,945 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-03 08:44:06,946 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:44:06,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:44:07,019 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:44:07,039 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:44:07,039 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-03 08:44:07,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-03 08:44:07,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-03 08:44:07,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-03 08:44:07,041 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-10-03 08:44:07,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:44:07,265 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-03 08:44:07,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-03 08:44:07,266 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-10-03 08:44:07,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:44:07,267 INFO L225 Difference]: With dead ends: 29 [2018-10-03 08:44:07,268 INFO L226 Difference]: Without dead ends: 27 [2018-10-03 08:44:07,269 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-03 08:44:07,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-03 08:44:07,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-03 08:44:07,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-03 08:44:07,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-03 08:44:07,275 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-10-03 08:44:07,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:44:07,282 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-03 08:44:07,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-03 08:44:07,282 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-03 08:44:07,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-03 08:44:07,283 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:44:07,283 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-10-03 08:44:07,283 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:44:07,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:44:07,286 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-10-03 08:44:07,286 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:44:07,286 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:44:07,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:44:07,288 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:44:07,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:44:07,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:44:07,710 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:44:07,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:44:07,710 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 [2018-10-03 08:44:07,717 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-03 08:45:19,237 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-03 08:45:19,237 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:45:25,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:45:25,257 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:45:25,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:45:25,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-03 08:45:25,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-03 08:45:25,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-03 08:45:25,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-03 08:45:25,265 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-10-03 08:45:25,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:45:25,692 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-03 08:45:25,693 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-03 08:45:25,693 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-10-03 08:45:25,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:45:25,694 INFO L225 Difference]: With dead ends: 31 [2018-10-03 08:45:25,694 INFO L226 Difference]: Without dead ends: 29 [2018-10-03 08:45:25,695 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-03 08:45:25,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-03 08:45:25,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-03 08:45:25,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-03 08:45:25,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-03 08:45:25,701 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-10-03 08:45:25,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:45:25,701 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-03 08:45:25,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-03 08:45:25,701 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-03 08:45:25,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-03 08:45:25,702 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:45:25,702 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-10-03 08:45:25,702 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:45:25,703 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:45:25,703 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-10-03 08:45:25,703 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:45:25,703 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:45:25,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:45:25,704 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:45:25,704 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:45:25,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:45:26,343 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:45:26,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:45:26,343 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 [2018-10-03 08:45:26,360 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-03 08:45:46,477 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-03 08:45:46,477 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:45:46,535 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:45:46,586 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:45:46,608 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:45:46,608 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-03 08:45:46,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-03 08:45:46,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-03 08:45:46,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-03 08:45:46,609 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-10-03 08:45:46,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:45:46,778 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-03 08:45:46,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-03 08:45:46,778 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-10-03 08:45:46,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:45:46,779 INFO L225 Difference]: With dead ends: 33 [2018-10-03 08:45:46,779 INFO L226 Difference]: Without dead ends: 31 [2018-10-03 08:45:46,780 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-03 08:45:46,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-03 08:45:46,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-03 08:45:46,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-03 08:45:46,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-03 08:45:46,786 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-10-03 08:45:46,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:45:46,786 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-03 08:45:46,786 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-03 08:45:46,786 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-03 08:45:46,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-03 08:45:46,787 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:45:46,787 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-10-03 08:45:46,787 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:45:46,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:45:46,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-10-03 08:45:46,788 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:45:46,788 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:45:46,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:45:46,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:45:46,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:45:46,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:45:47,135 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:45:47,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:45:47,135 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 [2018-10-03 08:45:47,143 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-03 08:45:47,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:45:47,173 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:45:47,192 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:45:47,213 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:45:47,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-03 08:45:47,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-03 08:45:47,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-03 08:45:47,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-03 08:45:47,214 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-10-03 08:45:47,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:45:47,415 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-03 08:45:47,415 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-03 08:45:47,415 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-10-03 08:45:47,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:45:47,416 INFO L225 Difference]: With dead ends: 35 [2018-10-03 08:45:47,416 INFO L226 Difference]: Without dead ends: 33 [2018-10-03 08:45:47,417 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-03 08:45:47,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-03 08:45:47,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-03 08:45:47,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-03 08:45:47,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-03 08:45:47,423 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-10-03 08:45:47,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:45:47,423 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-03 08:45:47,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-03 08:45:47,424 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-03 08:45:47,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-03 08:45:47,424 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:45:47,425 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-10-03 08:45:47,425 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:45:47,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:45:47,425 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-10-03 08:45:47,425 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:45:47,425 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:45:47,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:45:47,426 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-03 08:45:47,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:45:47,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:45:47,800 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:45:47,800 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:45:47,800 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 [2018-10-03 08:45:47,811 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-03 08:45:47,840 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-03 08:45:47,840 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:45:47,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:45:47,885 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:45:47,914 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:45:47,914 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-03 08:45:47,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-03 08:45:47,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-03 08:45:47,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-03 08:45:47,915 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-10-03 08:45:48,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:45:48,423 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-03 08:45:48,424 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-03 08:45:48,424 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-10-03 08:45:48,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:45:48,425 INFO L225 Difference]: With dead ends: 37 [2018-10-03 08:45:48,425 INFO L226 Difference]: Without dead ends: 35 [2018-10-03 08:45:48,426 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-03 08:45:48,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-03 08:45:48,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-10-03 08:45:48,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-03 08:45:48,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-03 08:45:48,431 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-10-03 08:45:48,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:45:48,431 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-03 08:45:48,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-03 08:45:48,432 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-03 08:45:48,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-03 08:45:48,432 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:45:48,433 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-10-03 08:45:48,433 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:45:48,433 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:45:48,433 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-10-03 08:45:48,433 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:45:48,433 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:45:48,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:45:48,434 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:45:48,434 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:45:48,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:45:48,765 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:45:48,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:45:48,766 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 [2018-10-03 08:45:48,775 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-03 08:46:21,211 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-03 08:46:21,211 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:46:21,224 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:46:21,268 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:46:21,289 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:46:21,289 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-03 08:46:21,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-03 08:46:21,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-03 08:46:21,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-03 08:46:21,290 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-10-03 08:46:21,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:46:21,520 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-03 08:46:21,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-03 08:46:21,523 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-10-03 08:46:21,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:46:21,524 INFO L225 Difference]: With dead ends: 39 [2018-10-03 08:46:21,524 INFO L226 Difference]: Without dead ends: 37 [2018-10-03 08:46:21,525 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-03 08:46:21,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-03 08:46:21,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-03 08:46:21,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-03 08:46:21,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-10-03 08:46:21,530 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-10-03 08:46:21,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:46:21,530 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-10-03 08:46:21,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-03 08:46:21,531 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-10-03 08:46:21,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-03 08:46:21,531 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:46:21,532 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-10-03 08:46:21,532 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:46:21,532 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:46:21,532 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-10-03 08:46:21,532 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:46:21,532 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:46:21,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:46:21,533 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:46:21,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:46:21,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:46:22,402 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:46:22,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:46:22,403 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-03 08:46:22,410 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-03 08:46:22,445 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-03 08:46:22,446 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:46:22,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:46:22,477 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:46:22,501 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:46:22,501 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-03 08:46:22,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-03 08:46:22,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-03 08:46:22,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-03 08:46:22,502 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-10-03 08:46:22,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:46:22,773 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-03 08:46:22,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-03 08:46:22,778 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-10-03 08:46:22,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:46:22,778 INFO L225 Difference]: With dead ends: 41 [2018-10-03 08:46:22,779 INFO L226 Difference]: Without dead ends: 39 [2018-10-03 08:46:22,779 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-03 08:46:22,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-03 08:46:22,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-03 08:46:22,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-03 08:46:22,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-03 08:46:22,791 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-10-03 08:46:22,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:46:22,792 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-03 08:46:22,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-03 08:46:22,792 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-03 08:46:22,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-03 08:46:22,793 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:46:22,793 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-10-03 08:46:22,793 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:46:22,793 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:46:22,794 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-10-03 08:46:22,794 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:46:22,794 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:46:22,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:46:22,795 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:46:22,795 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:46:22,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:46:23,617 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:46:23,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:46:23,617 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-03 08:46:23,625 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-03 08:48:02,049 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-03 08:48:02,050 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-03 08:48:05,444 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-03 08:48:05,482 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:48:05,503 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-03 08:48:05,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-03 08:48:05,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-03 08:48:05,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-03 08:48:05,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-03 08:48:05,505 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-10-03 08:48:05,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-03 08:48:05,860 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-03 08:48:05,860 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-03 08:48:05,860 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-10-03 08:48:05,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-03 08:48:05,861 INFO L225 Difference]: With dead ends: 43 [2018-10-03 08:48:05,861 INFO L226 Difference]: Without dead ends: 41 [2018-10-03 08:48:05,862 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-03 08:48:05,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-03 08:48:05,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-03 08:48:05,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-03 08:48:05,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-03 08:48:05,870 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-10-03 08:48:05,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-03 08:48:05,870 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-03 08:48:05,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-03 08:48:05,870 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-03 08:48:05,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-03 08:48:05,871 INFO L367 BasicCegarLoop]: Found error trace [2018-10-03 08:48:05,871 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-10-03 08:48:05,872 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-03 08:48:05,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-03 08:48:05,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-10-03 08:48:05,872 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-03 08:48:05,872 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-03 08:48:05,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:48:05,873 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-03 08:48:05,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-03 08:48:05,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-03 08:48:06,353 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-03 08:48:06,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-03 08:48:06,354 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-03 08:48:06,362 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown