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/toy/tooDifficultLoopInvariant/NeonAngel01.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1cc990c [2018-09-30 20:25:32,961 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-30 20:25:32,963 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-30 20:25:32,974 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-30 20:25:32,975 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-30 20:25:32,976 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-30 20:25:32,977 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-30 20:25:32,979 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-30 20:25:32,985 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-30 20:25:32,987 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-30 20:25:32,990 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-09-30 20:25:33,013 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-30 20:25:33,028 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-30 20:25:33,028 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-30 20:25:33,029 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-30 20:25:33,029 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-30 20:25:33,030 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-30 20:25:33,030 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-30 20:25:33,030 INFO L133 SettingsManager]: * Use SBE=true [2018-09-30 20:25:33,030 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-30 20:25:33,030 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-30 20:25:33,031 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-30 20:25:33,031 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-30 20:25:33,031 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-30 20:25:33,031 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-30 20:25:33,031 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-30 20:25:33,032 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-30 20:25:33,032 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-30 20:25:33,032 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-30 20:25:33,032 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-30 20:25:33,032 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-30 20:25:33,033 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-30 20:25:33,033 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-30 20:25:33,033 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-30 20:25:33,033 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 20:25:33,033 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-30 20:25:33,033 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-30 20:25:33,034 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-30 20:25:33,034 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-30 20:25:33,034 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-30 20:25:33,034 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-30 20:25:33,034 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-30 20:25:33,083 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-30 20:25:33,096 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-30 20:25:33,102 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-30 20:25:33,103 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-30 20:25:33,104 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-30 20:25:33,105 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl [2018-09-30 20:25:33,105 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/toy/tooDifficultLoopInvariant/NeonAngel01.bpl' [2018-09-30 20:25:33,157 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-30 20:25:33,162 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-30 20:25:33,163 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-30 20:25:33,163 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-30 20:25:33,164 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-30 20:25:33,185 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,198 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,203 WARN L165 Inliner]: Program contained no entry procedure! [2018-09-30 20:25:33,203 WARN L168 Inliner]: Missing entry procedures: [ULTIMATE.start] [2018-09-30 20:25:33,203 WARN L175 Inliner]: Fallback enabled. All procedures will be processed. [2018-09-30 20:25:33,205 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-30 20:25:33,206 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-30 20:25:33,206 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-30 20:25:33,207 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-30 20:25:33,218 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,218 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,219 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,219 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,223 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,228 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,229 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... [2018-09-30 20:25:33,231 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-30 20:25:33,232 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-30 20:25:33,232 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-30 20:25:33,233 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-30 20:25:33,234 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 20:25:33,306 INFO L124 BoogieDeclarations]: Specification and implementation of procedure main given in one single declaration [2018-09-30 20:25:33,307 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-30 20:25:33,307 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-30 20:25:33,509 INFO L345 CfgBuilder]: Using library mode [2018-09-30 20:25:33,510 INFO L202 PluginConnector]: Adding new model NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:25:33 BoogieIcfgContainer [2018-09-30 20:25:33,510 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-30 20:25:33,511 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-30 20:25:33,511 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-30 20:25:33,518 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-30 20:25:33,518 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:25:33" (1/2) ... [2018-09-30 20:25:33,519 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53da204b and model type NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.09 08:25:33, skipping insertion in model container [2018-09-30 20:25:33,519 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "NeonAngel01.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:25:33" (2/2) ... [2018-09-30 20:25:33,525 INFO L112 eAbstractionObserver]: Analyzing ICFG NeonAngel01.bpl [2018-09-30 20:25:33,533 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-30 20:25:33,541 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-30 20:25:33,585 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-30 20:25:33,586 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-30 20:25:33,586 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-30 20:25:33,586 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-30 20:25:33,586 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-30 20:25:33,586 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-30 20:25:33,587 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-30 20:25:33,587 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-30 20:25:33,587 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-30 20:25:33,607 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2018-09-30 20:25:33,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-09-30 20:25:33,615 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:33,617 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-09-30 20:25:33,619 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:33,626 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:33,626 INFO L82 PathProgramCache]: Analyzing trace with hash 30048, now seen corresponding path program 1 times [2018-09-30 20:25:33,628 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:33,629 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:33,689 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:33,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:25:33,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:33,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:33,790 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:33,792 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 20:25:33,792 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-30 20:25:33,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-30 20:25:33,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-30 20:25:33,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 20:25:33,810 INFO L87 Difference]: Start difference. First operand 6 states. Second operand 3 states. [2018-09-30 20:25:33,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:33,847 INFO L93 Difference]: Finished difference Result 13 states and 14 transitions. [2018-09-30 20:25:33,847 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-30 20:25:33,849 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2018-09-30 20:25:33,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:33,860 INFO L225 Difference]: With dead ends: 13 [2018-09-30 20:25:33,860 INFO L226 Difference]: Without dead ends: 5 [2018-09-30 20:25:33,864 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 20:25:33,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5 states. [2018-09-30 20:25:33,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5 to 5. [2018-09-30 20:25:33,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5 states. [2018-09-30 20:25:33,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5 states to 5 states and 5 transitions. [2018-09-30 20:25:33,900 INFO L78 Accepts]: Start accepts. Automaton has 5 states and 5 transitions. Word has length 3 [2018-09-30 20:25:33,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:33,900 INFO L480 AbstractCegarLoop]: Abstraction has 5 states and 5 transitions. [2018-09-30 20:25:33,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-30 20:25:33,900 INFO L276 IsEmpty]: Start isEmpty. Operand 5 states and 5 transitions. [2018-09-30 20:25:33,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-30 20:25:33,901 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:33,901 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-30 20:25:33,901 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:33,902 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:33,902 INFO L82 PathProgramCache]: Analyzing trace with hash 927622, now seen corresponding path program 1 times [2018-09-30 20:25:33,902 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:33,902 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:33,903 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:33,903 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:25:33,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:33,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:34,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:34,056 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:34,056 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:34,087 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:25:34,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:34,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:34,121 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:34,146 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:34,146 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-30 20:25:34,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-30 20:25:34,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-30 20:25:34,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-30 20:25:34,147 INFO L87 Difference]: Start difference. First operand 5 states and 5 transitions. Second operand 4 states. [2018-09-30 20:25:34,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:34,229 INFO L93 Difference]: Finished difference Result 8 states and 8 transitions. [2018-09-30 20:25:34,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-30 20:25:34,229 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2018-09-30 20:25:34,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:34,230 INFO L225 Difference]: With dead ends: 8 [2018-09-30 20:25:34,230 INFO L226 Difference]: Without dead ends: 6 [2018-09-30 20:25:34,231 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-09-30 20:25:34,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2018-09-30 20:25:34,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2018-09-30 20:25:34,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2018-09-30 20:25:34,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2018-09-30 20:25:34,234 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2018-09-30 20:25:34,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:34,234 INFO L480 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2018-09-30 20:25:34,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-30 20:25:34,234 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2018-09-30 20:25:34,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2018-09-30 20:25:34,235 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:34,235 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2018-09-30 20:25:34,235 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:34,236 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:34,236 INFO L82 PathProgramCache]: Analyzing trace with hash 28752416, now seen corresponding path program 2 times [2018-09-30 20:25:34,236 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:34,236 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:34,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:34,237 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:25:34,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:34,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:34,332 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:34,333 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:34,333 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:34,342 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:25:34,354 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:25:34,355 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:34,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:34,363 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:34,385 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:34,385 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-30 20:25:34,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-30 20:25:34,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-30 20:25:34,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:25:34,386 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 5 states. [2018-09-30 20:25:34,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:34,422 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2018-09-30 20:25:34,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-30 20:25:34,423 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2018-09-30 20:25:34,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:34,423 INFO L225 Difference]: With dead ends: 9 [2018-09-30 20:25:34,423 INFO L226 Difference]: Without dead ends: 7 [2018-09-30 20:25:34,424 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:25:34,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-30 20:25:34,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-30 20:25:34,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-30 20:25:34,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-30 20:25:34,427 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 5 [2018-09-30 20:25:34,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:34,427 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-30 20:25:34,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-30 20:25:34,428 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-30 20:25:34,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-30 20:25:34,428 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:34,428 INFO L375 BasicCegarLoop]: trace histogram [3, 1, 1, 1] [2018-09-30 20:25:34,429 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:34,429 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:34,429 INFO L82 PathProgramCache]: Analyzing trace with hash 891321030, now seen corresponding path program 3 times [2018-09-30 20:25:34,429 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:34,430 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:34,430 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:34,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:34,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:34,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:34,517 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:34,518 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:34,518 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:34,526 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:25:34,539 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-09-30 20:25:34,539 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:34,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:34,548 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:34,571 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:34,571 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-30 20:25:34,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-30 20:25:34,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-30 20:25:34,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:25:34,572 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 6 states. [2018-09-30 20:25:34,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:34,630 INFO L93 Difference]: Finished difference Result 10 states and 10 transitions. [2018-09-30 20:25:34,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-30 20:25:34,631 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2018-09-30 20:25:34,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:34,631 INFO L225 Difference]: With dead ends: 10 [2018-09-30 20:25:34,632 INFO L226 Difference]: Without dead ends: 8 [2018-09-30 20:25:34,632 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:25:34,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2018-09-30 20:25:34,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2018-09-30 20:25:34,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2018-09-30 20:25:34,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2018-09-30 20:25:34,635 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2018-09-30 20:25:34,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:34,635 INFO L480 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2018-09-30 20:25:34,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-30 20:25:34,635 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2018-09-30 20:25:34,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2018-09-30 20:25:34,636 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:34,636 INFO L375 BasicCegarLoop]: trace histogram [4, 1, 1, 1] [2018-09-30 20:25:34,636 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:34,637 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:34,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1861144288, now seen corresponding path program 4 times [2018-09-30 20:25:34,637 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:34,637 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:34,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:34,638 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:34,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:34,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:34,869 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:34,870 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:34,870 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:34,884 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:25:34,919 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:25:34,920 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:34,922 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:34,929 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:34,960 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:34,961 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-30 20:25:34,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-30 20:25:34,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-30 20:25:34,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:25:34,962 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 7 states. [2018-09-30 20:25:34,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:34,998 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-30 20:25:34,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-30 20:25:34,999 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2018-09-30 20:25:34,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:34,999 INFO L225 Difference]: With dead ends: 11 [2018-09-30 20:25:34,999 INFO L226 Difference]: Without dead ends: 9 [2018-09-30 20:25:35,000 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:25:35,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-30 20:25:35,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-30 20:25:35,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-30 20:25:35,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-30 20:25:35,004 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-09-30 20:25:35,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:35,004 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-30 20:25:35,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-30 20:25:35,004 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-30 20:25:35,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-30 20:25:35,005 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:35,005 INFO L375 BasicCegarLoop]: trace histogram [5, 1, 1, 1] [2018-09-30 20:25:35,005 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:35,006 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:35,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1860894214, now seen corresponding path program 5 times [2018-09-30 20:25:35,006 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:35,006 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:35,007 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:35,007 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:35,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:35,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:35,170 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:35,171 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:35,171 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:35,183 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:25:35,218 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2018-09-30 20:25:35,219 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:35,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:35,237 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:35,267 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:35,267 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-30 20:25:35,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-30 20:25:35,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-30 20:25:35,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-09-30 20:25:35,269 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 8 states. [2018-09-30 20:25:35,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:35,310 INFO L93 Difference]: Finished difference Result 12 states and 12 transitions. [2018-09-30 20:25:35,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-30 20:25:35,311 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 8 [2018-09-30 20:25:35,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:35,311 INFO L225 Difference]: With dead ends: 12 [2018-09-30 20:25:35,312 INFO L226 Difference]: Without dead ends: 10 [2018-09-30 20:25:35,312 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-09-30 20:25:35,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2018-09-30 20:25:35,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-09-30 20:25:35,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2018-09-30 20:25:35,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-09-30 20:25:35,316 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-09-30 20:25:35,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:35,316 INFO L480 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2018-09-30 20:25:35,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-30 20:25:35,316 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2018-09-30 20:25:35,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-09-30 20:25:35,317 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:35,317 INFO L375 BasicCegarLoop]: trace histogram [6, 1, 1, 1] [2018-09-30 20:25:35,317 INFO L423 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:35,318 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:35,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1853141920, now seen corresponding path program 6 times [2018-09-30 20:25:35,318 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:35,318 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:35,319 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:35,319 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:35,320 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:35,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:35,540 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:35,541 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:35,541 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:35,550 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:25:35,569 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2018-09-30 20:25:35,570 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:35,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:35,579 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:35,603 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:35,603 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-30 20:25:35,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-30 20:25:35,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-30 20:25:35,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:25:35,604 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 9 states. [2018-09-30 20:25:35,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:35,632 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-30 20:25:35,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-30 20:25:35,633 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 9 [2018-09-30 20:25:35,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:35,634 INFO L225 Difference]: With dead ends: 13 [2018-09-30 20:25:35,634 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 20:25:35,635 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:25:35,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 20:25:35,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-30 20:25:35,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-30 20:25:35,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-30 20:25:35,639 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-09-30 20:25:35,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:35,639 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-30 20:25:35,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-30 20:25:35,639 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-30 20:25:35,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-30 20:25:35,640 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:35,640 INFO L375 BasicCegarLoop]: trace histogram [7, 1, 1, 1] [2018-09-30 20:25:35,640 INFO L423 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:35,641 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:35,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1612820806, now seen corresponding path program 7 times [2018-09-30 20:25:35,641 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:35,641 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:35,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:35,642 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:35,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:35,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:35,815 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:35,815 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:35,816 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:35,824 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:25:35,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:35,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:35,856 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:35,889 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:35,889 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-30 20:25:35,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 20:25:35,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 20:25:35,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:25:35,891 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 10 states. [2018-09-30 20:25:36,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:36,142 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2018-09-30 20:25:36,144 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 20:25:36,144 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 10 [2018-09-30 20:25:36,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:36,145 INFO L225 Difference]: With dead ends: 14 [2018-09-30 20:25:36,145 INFO L226 Difference]: Without dead ends: 12 [2018-09-30 20:25:36,146 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:25:36,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-09-30 20:25:36,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-09-30 20:25:36,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-09-30 20:25:36,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-09-30 20:25:36,153 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-09-30 20:25:36,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:36,153 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-09-30 20:25:36,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 20:25:36,155 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-09-30 20:25:36,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-30 20:25:36,155 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:36,155 INFO L375 BasicCegarLoop]: trace histogram [8, 1, 1, 1] [2018-09-30 20:25:36,156 INFO L423 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:36,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:36,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1542166432, now seen corresponding path program 8 times [2018-09-30 20:25:36,156 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:36,157 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:36,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:36,158 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:25:36,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:36,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:36,358 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:36,359 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:36,359 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:36,368 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:25:36,381 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:25:36,382 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:36,384 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:36,393 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:36,419 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:36,420 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-30 20:25:36,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-30 20:25:36,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-30 20:25:36,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-09-30 20:25:36,421 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2018-09-30 20:25:36,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:36,473 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-30 20:25:36,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-30 20:25:36,473 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2018-09-30 20:25:36,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:36,474 INFO L225 Difference]: With dead ends: 15 [2018-09-30 20:25:36,474 INFO L226 Difference]: Without dead ends: 13 [2018-09-30 20:25:36,474 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-09-30 20:25:36,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-30 20:25:36,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-30 20:25:36,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-30 20:25:36,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-30 20:25:36,478 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2018-09-30 20:25:36,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:36,479 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-30 20:25:36,479 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-30 20:25:36,479 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-30 20:25:36,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-30 20:25:36,479 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:36,480 INFO L375 BasicCegarLoop]: trace histogram [9, 1, 1, 1] [2018-09-30 20:25:36,480 INFO L423 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:36,480 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:36,480 INFO L82 PathProgramCache]: Analyzing trace with hash -562523002, now seen corresponding path program 9 times [2018-09-30 20:25:36,481 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:36,481 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:36,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:36,482 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:36,482 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:36,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:36,684 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:36,684 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:36,684 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:36,693 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:25:37,010 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-09-30 20:25:37,010 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:37,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:37,022 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:37,043 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:37,043 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-30 20:25:37,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-30 20:25:37,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-30 20:25:37,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-09-30 20:25:37,045 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2018-09-30 20:25:37,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:37,099 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2018-09-30 20:25:37,099 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-30 20:25:37,099 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2018-09-30 20:25:37,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:37,100 INFO L225 Difference]: With dead ends: 16 [2018-09-30 20:25:37,100 INFO L226 Difference]: Without dead ends: 14 [2018-09-30 20:25:37,101 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-09-30 20:25:37,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-09-30 20:25:37,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-09-30 20:25:37,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-09-30 20:25:37,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-09-30 20:25:37,104 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2018-09-30 20:25:37,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:37,105 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-09-30 20:25:37,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-30 20:25:37,105 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-09-30 20:25:37,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-30 20:25:37,105 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:37,106 INFO L375 BasicCegarLoop]: trace histogram [10, 1, 1, 1] [2018-09-30 20:25:37,106 INFO L423 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:37,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:37,106 INFO L82 PathProgramCache]: Analyzing trace with hash -258347744, now seen corresponding path program 10 times [2018-09-30 20:25:37,106 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:37,106 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:37,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:37,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:37,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:37,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:37,464 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:37,464 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:37,464 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:37,472 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:25:37,489 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:25:37,489 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:37,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:37,500 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:37,526 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:37,526 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-30 20:25:37,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-30 20:25:37,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-30 20:25:37,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-09-30 20:25:37,528 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 13 states. [2018-09-30 20:25:37,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:37,566 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-30 20:25:37,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-30 20:25:37,566 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 13 [2018-09-30 20:25:37,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:37,568 INFO L225 Difference]: With dead ends: 17 [2018-09-30 20:25:37,568 INFO L226 Difference]: Without dead ends: 15 [2018-09-30 20:25:37,569 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-09-30 20:25:37,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-30 20:25:37,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-30 20:25:37,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-30 20:25:37,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-30 20:25:37,574 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2018-09-30 20:25:37,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:37,574 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-30 20:25:37,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-30 20:25:37,574 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-30 20:25:37,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-30 20:25:37,575 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:37,575 INFO L375 BasicCegarLoop]: trace histogram [11, 1, 1, 1] [2018-09-30 20:25:37,575 INFO L423 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:37,576 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:37,576 INFO L82 PathProgramCache]: Analyzing trace with hash 581150662, now seen corresponding path program 11 times [2018-09-30 20:25:37,576 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:37,576 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:37,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:37,577 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:37,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:37,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:37,855 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:37,856 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:37,856 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:37,864 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:25:40,376 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-09-30 20:25:40,377 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:40,381 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:40,390 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:40,413 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:40,413 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-30 20:25:40,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-30 20:25:40,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-30 20:25:40,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-09-30 20:25:40,414 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 14 states. [2018-09-30 20:25:40,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:40,457 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2018-09-30 20:25:40,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-30 20:25:40,457 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2018-09-30 20:25:40,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:40,458 INFO L225 Difference]: With dead ends: 18 [2018-09-30 20:25:40,458 INFO L226 Difference]: Without dead ends: 16 [2018-09-30 20:25:40,458 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-09-30 20:25:40,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-30 20:25:40,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-09-30 20:25:40,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-09-30 20:25:40,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-09-30 20:25:40,462 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2018-09-30 20:25:40,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:40,462 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-09-30 20:25:40,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-30 20:25:40,463 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-09-30 20:25:40,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-09-30 20:25:40,463 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:40,463 INFO L375 BasicCegarLoop]: trace histogram [12, 1, 1, 1] [2018-09-30 20:25:40,464 INFO L423 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:40,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:40,464 INFO L82 PathProgramCache]: Analyzing trace with hash 835797472, now seen corresponding path program 12 times [2018-09-30 20:25:40,464 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:40,464 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:40,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:40,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:40,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:40,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:40,645 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:40,645 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:40,646 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:40,655 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:25:40,688 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-30 20:25:40,689 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:40,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:40,701 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:40,728 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:40,728 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-30 20:25:40,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-30 20:25:40,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-30 20:25:40,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-30 20:25:40,729 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 15 states. [2018-09-30 20:25:40,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:40,765 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-30 20:25:40,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-30 20:25:40,765 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 15 [2018-09-30 20:25:40,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:40,766 INFO L225 Difference]: With dead ends: 19 [2018-09-30 20:25:40,766 INFO L226 Difference]: Without dead ends: 17 [2018-09-30 20:25:40,766 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-09-30 20:25:40,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-30 20:25:40,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-30 20:25:40,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-30 20:25:40,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-30 20:25:40,770 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2018-09-30 20:25:40,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:40,771 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-30 20:25:40,771 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-30 20:25:40,771 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-30 20:25:40,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-30 20:25:40,772 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:40,772 INFO L375 BasicCegarLoop]: trace histogram [13, 1, 1, 1] [2018-09-30 20:25:40,772 INFO L423 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:40,772 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:40,772 INFO L82 PathProgramCache]: Analyzing trace with hash 139913990, now seen corresponding path program 13 times [2018-09-30 20:25:40,772 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:40,772 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:40,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:40,773 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:40,773 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:40,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:41,057 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:41,058 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:41,058 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:41,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:25:41,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:41,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:41,092 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:41,114 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:41,115 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-30 20:25:41,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-30 20:25:41,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-30 20:25:41,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-09-30 20:25:41,116 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 16 states. [2018-09-30 20:25:41,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:41,355 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2018-09-30 20:25:41,355 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-30 20:25:41,355 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 16 [2018-09-30 20:25:41,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:41,356 INFO L225 Difference]: With dead ends: 20 [2018-09-30 20:25:41,356 INFO L226 Difference]: Without dead ends: 18 [2018-09-30 20:25:41,357 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2018-09-30 20:25:41,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-09-30 20:25:41,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-09-30 20:25:41,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-30 20:25:41,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-09-30 20:25:41,360 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2018-09-30 20:25:41,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:41,360 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-09-30 20:25:41,361 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-30 20:25:41,361 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-09-30 20:25:41,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-30 20:25:41,361 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:41,362 INFO L375 BasicCegarLoop]: trace histogram [14, 1, 1, 1] [2018-09-30 20:25:41,362 INFO L423 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:41,362 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:41,362 INFO L82 PathProgramCache]: Analyzing trace with hash 42362528, now seen corresponding path program 14 times [2018-09-30 20:25:41,362 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:41,363 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:41,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:41,364 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:25:41,364 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:41,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:41,811 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:41,811 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:41,812 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:41,827 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:25:41,844 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:25:41,844 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:41,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:41,857 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:41,879 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:41,879 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-30 20:25:41,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-30 20:25:41,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-30 20:25:41,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-30 20:25:41,881 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 17 states. [2018-09-30 20:25:41,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:41,935 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-30 20:25:41,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-30 20:25:41,936 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 17 [2018-09-30 20:25:41,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:41,936 INFO L225 Difference]: With dead ends: 21 [2018-09-30 20:25:41,936 INFO L226 Difference]: Without dead ends: 19 [2018-09-30 20:25:41,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-09-30 20:25:41,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-30 20:25:41,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-30 20:25:41,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-30 20:25:41,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-30 20:25:41,940 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2018-09-30 20:25:41,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:41,941 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-30 20:25:41,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-30 20:25:41,941 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-30 20:25:41,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-30 20:25:41,942 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:41,942 INFO L375 BasicCegarLoop]: trace histogram [15, 1, 1, 1] [2018-09-30 20:25:41,942 INFO L423 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:41,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:41,943 INFO L82 PathProgramCache]: Analyzing trace with hash 1313234502, now seen corresponding path program 15 times [2018-09-30 20:25:41,943 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:41,943 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:41,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:41,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:41,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:41,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:42,231 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:42,231 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:42,232 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:42,240 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:25:44,581 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-09-30 20:25:44,581 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:44,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:44,592 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:44,614 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:44,614 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-30 20:25:44,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-30 20:25:44,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-30 20:25:44,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-30 20:25:44,615 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 18 states. [2018-09-30 20:25:44,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:44,673 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2018-09-30 20:25:44,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-30 20:25:44,673 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2018-09-30 20:25:44,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:44,674 INFO L225 Difference]: With dead ends: 22 [2018-09-30 20:25:44,674 INFO L226 Difference]: Without dead ends: 20 [2018-09-30 20:25:44,674 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-09-30 20:25:44,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-09-30 20:25:44,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-09-30 20:25:44,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-09-30 20:25:44,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-09-30 20:25:44,677 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-09-30 20:25:44,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:44,677 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-09-30 20:25:44,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-30 20:25:44,678 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-09-30 20:25:44,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-09-30 20:25:44,678 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:44,678 INFO L375 BasicCegarLoop]: trace histogram [16, 1, 1, 1] [2018-09-30 20:25:44,678 INFO L423 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:44,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:44,679 INFO L82 PathProgramCache]: Analyzing trace with hash 2055560032, now seen corresponding path program 16 times [2018-09-30 20:25:44,679 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:44,679 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:44,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:44,679 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:44,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:44,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:45,279 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:45,279 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:45,279 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 [2018-09-30 20:25:45,286 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:25:45,310 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:25:45,311 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:45,313 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:45,322 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:45,351 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:45,351 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-30 20:25:45,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-30 20:25:45,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-30 20:25:45,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-30 20:25:45,353 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 19 states. [2018-09-30 20:25:45,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:45,508 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-30 20:25:45,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-30 20:25:45,508 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 19 [2018-09-30 20:25:45,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:45,509 INFO L225 Difference]: With dead ends: 23 [2018-09-30 20:25:45,509 INFO L226 Difference]: Without dead ends: 21 [2018-09-30 20:25:45,510 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-09-30 20:25:45,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-30 20:25:45,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-30 20:25:45,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-30 20:25:45,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-30 20:25:45,514 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-09-30 20:25:45,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:45,514 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-30 20:25:45,514 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-30 20:25:45,514 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-30 20:25:45,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-30 20:25:45,515 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:45,515 INFO L375 BasicCegarLoop]: trace histogram [17, 1, 1, 1] [2018-09-30 20:25:45,515 INFO L423 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:45,515 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:45,516 INFO L82 PathProgramCache]: Analyzing trace with hash -702152314, now seen corresponding path program 17 times [2018-09-30 20:25:45,516 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:45,516 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:45,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:45,517 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:45,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:45,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:45,947 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:45,947 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:45,947 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 [2018-09-30 20:25:45,959 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:26:37,432 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2018-09-30 20:26:37,432 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:26:38,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:26:38,025 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:26:38,032 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:26:38,032 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-30 20:26:38,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-30 20:26:38,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-30 20:26:38,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-30 20:26:38,034 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 20 states. [2018-09-30 20:26:38,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:26:38,204 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2018-09-30 20:26:38,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-30 20:26:38,204 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 20 [2018-09-30 20:26:38,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:26:38,205 INFO L225 Difference]: With dead ends: 24 [2018-09-30 20:26:38,205 INFO L226 Difference]: Without dead ends: 22 [2018-09-30 20:26:38,205 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-09-30 20:26:38,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-09-30 20:26:38,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-09-30 20:26:38,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-30 20:26:38,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-09-30 20:26:38,209 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-09-30 20:26:38,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:26:38,210 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-09-30 20:26:38,210 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-30 20:26:38,210 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-09-30 20:26:38,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-30 20:26:38,211 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:26:38,211 INFO L375 BasicCegarLoop]: trace histogram [18, 1, 1, 1] [2018-09-30 20:26:38,211 INFO L423 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:26:38,211 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:26:38,211 INFO L82 PathProgramCache]: Analyzing trace with hash -291889120, now seen corresponding path program 18 times [2018-09-30 20:26:38,211 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:26:38,212 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:26:38,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:26:38,213 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:26:38,213 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:26:38,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:26:38,540 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:26:38,540 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:26:38,541 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 [2018-09-30 20:26:38,550 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:26:40,445 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2018-09-30 20:26:40,446 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:26:40,453 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:26:40,464 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:26:40,493 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:26:40,493 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-09-30 20:26:40,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-30 20:26:40,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-30 20:26:40,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-30 20:26:40,494 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 21 states. [2018-09-30 20:26:40,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:26:40,590 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-30 20:26:40,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-30 20:26:40,590 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2018-09-30 20:26:40,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:26:40,591 INFO L225 Difference]: With dead ends: 25 [2018-09-30 20:26:40,591 INFO L226 Difference]: Without dead ends: 23 [2018-09-30 20:26:40,592 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-09-30 20:26:40,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-30 20:26:40,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-30 20:26:40,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-30 20:26:40,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-30 20:26:40,595 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-09-30 20:26:40,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:26:40,596 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-30 20:26:40,596 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-30 20:26:40,596 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-30 20:26:40,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-30 20:26:40,597 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:26:40,597 INFO L375 BasicCegarLoop]: trace histogram [19, 1, 1, 1] [2018-09-30 20:26:40,597 INFO L423 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:26:40,597 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:26:40,598 INFO L82 PathProgramCache]: Analyzing trace with hash -458631994, now seen corresponding path program 19 times [2018-09-30 20:26:40,598 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:26:40,598 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:26:40,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:26:40,599 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:26:40,599 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:26:40,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:26:41,009 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:26:41,010 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:26:41,010 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:26:41,017 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:26:41,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:26:41,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:26:41,053 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:26:41,082 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:26:41,082 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-30 20:26:41,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-30 20:26:41,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-30 20:26:41,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-30 20:26:41,083 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 22 states. [2018-09-30 20:26:41,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:26:41,151 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-09-30 20:26:41,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-30 20:26:41,151 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2018-09-30 20:26:41,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:26:41,152 INFO L225 Difference]: With dead ends: 26 [2018-09-30 20:26:41,152 INFO L226 Difference]: Without dead ends: 24 [2018-09-30 20:26:41,153 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2018-09-30 20:26:41,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-30 20:26:41,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-30 20:26:41,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-30 20:26:41,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-30 20:26:41,156 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-09-30 20:26:41,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:26:41,157 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-30 20:26:41,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-30 20:26:41,157 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-30 20:26:41,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-30 20:26:41,157 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:26:41,158 INFO L375 BasicCegarLoop]: trace histogram [20, 1, 1, 1] [2018-09-30 20:26:41,158 INFO L423 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:26:41,158 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:26:41,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1332693792, now seen corresponding path program 20 times [2018-09-30 20:26:41,158 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:26:41,158 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:26:41,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:26:41,159 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:26:41,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:26:41,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:26:41,525 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:26:41,525 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:26:41,525 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:26:41,534 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:26:41,548 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:26:41,548 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:26:41,550 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:26:41,559 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:26:41,592 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:26:41,592 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-30 20:26:41,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-30 20:26:41,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-30 20:26:41,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-30 20:26:41,593 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 23 states. [2018-09-30 20:26:41,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:26:41,699 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-30 20:26:41,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-30 20:26:41,699 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 23 [2018-09-30 20:26:41,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:26:41,700 INFO L225 Difference]: With dead ends: 27 [2018-09-30 20:26:41,700 INFO L226 Difference]: Without dead ends: 25 [2018-09-30 20:26:41,701 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-09-30 20:26:41,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-30 20:26:41,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-30 20:26:41,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-30 20:26:41,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-30 20:26:41,705 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-09-30 20:26:41,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:26:41,705 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-30 20:26:41,705 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-30 20:26:41,705 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-30 20:26:41,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-30 20:26:41,706 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:26:41,706 INFO L375 BasicCegarLoop]: trace histogram [21, 1, 1, 1] [2018-09-30 20:26:41,706 INFO L423 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:26:41,706 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:26:41,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1636161542, now seen corresponding path program 21 times [2018-09-30 20:26:41,707 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:26:41,707 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:26:41,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:26:41,708 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:26:41,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:26:41,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:26:42,570 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:26:42,570 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:26:42,571 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:26:42,579 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:27:12,664 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-09-30 20:27:12,664 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:27:12,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:27:12,694 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:27:12,718 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:27:12,718 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-09-30 20:27:12,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-30 20:27:12,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-30 20:27:12,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-09-30 20:27:12,719 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 24 states. [2018-09-30 20:27:12,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:27:12,780 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2018-09-30 20:27:12,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-30 20:27:12,782 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2018-09-30 20:27:12,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:27:12,783 INFO L225 Difference]: With dead ends: 28 [2018-09-30 20:27:12,783 INFO L226 Difference]: Without dead ends: 26 [2018-09-30 20:27:12,783 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-09-30 20:27:12,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-30 20:27:12,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-30 20:27:12,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-30 20:27:12,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-09-30 20:27:12,786 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-09-30 20:27:12,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:27:12,787 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-09-30 20:27:12,787 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-30 20:27:12,787 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-09-30 20:27:12,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-30 20:27:12,787 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:27:12,787 INFO L375 BasicCegarLoop]: trace histogram [22, 1, 1, 1] [2018-09-30 20:27:12,788 INFO L423 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:27:12,788 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:27:12,788 INFO L82 PathProgramCache]: Analyzing trace with hash -818603616, now seen corresponding path program 22 times [2018-09-30 20:27:12,788 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:27:12,788 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:27:12,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:27:12,789 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:27:12,789 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:27:12,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:27:13,148 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:27:13,149 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:27:13,149 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:27:13,156 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:27:13,173 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:27:13,173 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:27:13,175 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:27:13,184 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:27:13,205 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:27:13,205 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-09-30 20:27:13,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-30 20:27:13,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-30 20:27:13,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-09-30 20:27:13,206 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 25 states. [2018-09-30 20:27:13,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:27:13,262 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-30 20:27:13,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-30 20:27:13,263 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2018-09-30 20:27:13,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:27:13,264 INFO L225 Difference]: With dead ends: 29 [2018-09-30 20:27:13,264 INFO L226 Difference]: Without dead ends: 27 [2018-09-30 20:27:13,265 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-09-30 20:27:13,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-30 20:27:13,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-30 20:27:13,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-30 20:27:13,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-30 20:27:13,268 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-09-30 20:27:13,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:27:13,268 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-30 20:27:13,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-30 20:27:13,268 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-30 20:27:13,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-30 20:27:13,269 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:27:13,269 INFO L375 BasicCegarLoop]: trace histogram [23, 1, 1, 1] [2018-09-30 20:27:13,269 INFO L423 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:27:13,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:27:13,269 INFO L82 PathProgramCache]: Analyzing trace with hash 393087814, now seen corresponding path program 23 times [2018-09-30 20:27:13,270 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:27:13,270 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:27:13,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:27:13,270 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:27:13,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:27:13,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:27:13,679 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:27:13,679 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:27:13,679 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:27:13,688 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:28:27,104 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-09-30 20:28:27,104 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:27,358 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:27,369 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (24)] Exception during sending of exit command (exit): Broken pipe [2018-09-30 20:28:27,375 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:28:27,375 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-09-30 20:28:27,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-30 20:28:27,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-30 20:28:27,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-09-30 20:28:27,376 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 26 states. [2018-09-30 20:28:27,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:27,482 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-09-30 20:28:27,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-30 20:28:27,482 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2018-09-30 20:28:27,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:27,483 INFO L225 Difference]: With dead ends: 30 [2018-09-30 20:28:27,483 INFO L226 Difference]: Without dead ends: 28 [2018-09-30 20:28:27,484 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-09-30 20:28:27,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-30 20:28:27,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-09-30 20:28:27,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-09-30 20:28:27,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-09-30 20:28:27,488 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-09-30 20:28:27,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:27,488 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-09-30 20:28:27,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-30 20:28:27,488 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-09-30 20:28:27,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-09-30 20:28:27,489 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:27,489 INFO L375 BasicCegarLoop]: trace histogram [24, 1, 1, 1] [2018-09-30 20:28:27,489 INFO L423 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:28:27,490 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:27,490 INFO L82 PathProgramCache]: Analyzing trace with hash -699183520, now seen corresponding path program 24 times [2018-09-30 20:28:27,490 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:27,490 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:27,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:27,491 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:27,491 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:27,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:28:28,240 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:28,241 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:28:28,241 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:28:28,250 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:28:35,952 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-30 20:28:35,952 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:35,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:35,977 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:36,008 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:28:36,008 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-09-30 20:28:36,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-30 20:28:36,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-30 20:28:36,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-09-30 20:28:36,009 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 27 states. [2018-09-30 20:28:36,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:36,065 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-30 20:28:36,065 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-30 20:28:36,066 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 27 [2018-09-30 20:28:36,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:36,066 INFO L225 Difference]: With dead ends: 31 [2018-09-30 20:28:36,066 INFO L226 Difference]: Without dead ends: 29 [2018-09-30 20:28:36,067 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-09-30 20:28:36,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-30 20:28:36,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-30 20:28:36,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-30 20:28:36,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-30 20:28:36,071 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-09-30 20:28:36,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:36,072 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-30 20:28:36,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-30 20:28:36,072 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-30 20:28:36,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-30 20:28:36,072 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:36,073 INFO L375 BasicCegarLoop]: trace histogram [25, 1, 1, 1] [2018-09-30 20:28:36,073 INFO L423 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:28:36,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:36,073 INFO L82 PathProgramCache]: Analyzing trace with hash -199856506, now seen corresponding path program 25 times [2018-09-30 20:28:36,073 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:36,073 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:36,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:36,074 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:36,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:36,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:28:36,615 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:36,616 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:28:36,616 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:28:36,624 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:36,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:28:36,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:36,656 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:36,683 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:28:36,683 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-09-30 20:28:36,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-30 20:28:36,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-30 20:28:36,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-09-30 20:28:36,684 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 28 states. [2018-09-30 20:28:36,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:36,732 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-09-30 20:28:36,734 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-30 20:28:36,734 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 28 [2018-09-30 20:28:36,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:36,735 INFO L225 Difference]: With dead ends: 32 [2018-09-30 20:28:36,735 INFO L226 Difference]: Without dead ends: 30 [2018-09-30 20:28:36,735 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-09-30 20:28:36,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-30 20:28:36,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-09-30 20:28:36,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-30 20:28:36,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-30 20:28:36,739 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-09-30 20:28:36,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:36,739 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-30 20:28:36,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-30 20:28:36,739 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-30 20:28:36,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-30 20:28:36,740 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:36,740 INFO L375 BasicCegarLoop]: trace histogram [26, 1, 1, 1] [2018-09-30 20:28:36,740 INFO L423 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:28:36,740 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:36,741 INFO L82 PathProgramCache]: Analyzing trace with hash -1900588256, now seen corresponding path program 26 times [2018-09-30 20:28:36,741 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:36,741 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:36,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:36,742 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:28:36,742 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:36,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:28:37,823 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:37,824 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:28:37,824 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:28:37,831 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:28:37,852 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:28:37,852 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:28:37,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:28:37,864 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:37,888 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:28:37,888 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-09-30 20:28:37,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-30 20:28:37,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-30 20:28:37,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-09-30 20:28:37,890 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 29 states. [2018-09-30 20:28:38,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:28:38,052 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-30 20:28:38,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-30 20:28:38,053 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 29 [2018-09-30 20:28:38,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:28:38,053 INFO L225 Difference]: With dead ends: 33 [2018-09-30 20:28:38,054 INFO L226 Difference]: Without dead ends: 31 [2018-09-30 20:28:38,054 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-09-30 20:28:38,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-30 20:28:38,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-30 20:28:38,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-30 20:28:38,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-30 20:28:38,058 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-09-30 20:28:38,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:28:38,059 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-30 20:28:38,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-30 20:28:38,059 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-30 20:28:38,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-30 20:28:38,059 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:28:38,059 INFO L375 BasicCegarLoop]: trace histogram [27, 1, 1, 1] [2018-09-30 20:28:38,060 INFO L423 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:28:38,060 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:28:38,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1211302342, now seen corresponding path program 27 times [2018-09-30 20:28:38,060 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:28:38,060 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:28:38,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:38,061 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:28:38,061 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:28:38,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:28:39,017 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:28:39,017 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:28:39,017 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:28:39,027 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:29:32,536 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-09-30 20:29:32,536 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:32,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:32,558 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:32,588 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:29:32,588 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-09-30 20:29:32,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-30 20:29:32,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-30 20:29:32,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-09-30 20:29:32,590 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-09-30 20:29:32,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:32,650 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-09-30 20:29:32,650 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-30 20:29:32,650 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-09-30 20:29:32,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:32,651 INFO L225 Difference]: With dead ends: 34 [2018-09-30 20:29:32,651 INFO L226 Difference]: Without dead ends: 32 [2018-09-30 20:29:32,652 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-09-30 20:29:32,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-09-30 20:29:32,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-09-30 20:29:32,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-30 20:29:32,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-09-30 20:29:32,657 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-09-30 20:29:32,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:32,657 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-09-30 20:29:32,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-30 20:29:32,657 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-09-30 20:29:32,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-09-30 20:29:32,658 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:32,658 INFO L375 BasicCegarLoop]: trace histogram [28, 1, 1, 1] [2018-09-30 20:29:32,658 INFO L423 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:29:32,658 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:32,659 INFO L82 PathProgramCache]: Analyzing trace with hash -1104336928, now seen corresponding path program 28 times [2018-09-30 20:29:32,659 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:32,659 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:32,661 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:32,661 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:32,662 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:32,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:29:33,169 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:33,170 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:29:33,170 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:29:33,184 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:29:33,205 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:29:33,205 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:29:33,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:29:33,216 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:33,237 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:29:33,237 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-09-30 20:29:33,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-30 20:29:33,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-30 20:29:33,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-09-30 20:29:33,238 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 31 states. [2018-09-30 20:29:33,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:29:33,299 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-30 20:29:33,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-30 20:29:33,300 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 31 [2018-09-30 20:29:33,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:29:33,300 INFO L225 Difference]: With dead ends: 35 [2018-09-30 20:29:33,300 INFO L226 Difference]: Without dead ends: 33 [2018-09-30 20:29:33,301 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-09-30 20:29:33,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-30 20:29:33,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-30 20:29:33,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-30 20:29:33,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-30 20:29:33,305 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-09-30 20:29:33,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:29:33,305 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-30 20:29:33,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-30 20:29:33,305 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-30 20:29:33,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-30 20:29:33,306 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:29:33,306 INFO L375 BasicCegarLoop]: trace histogram [29, 1, 1, 1] [2018-09-30 20:29:33,306 INFO L423 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:29:33,306 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:29:33,307 INFO L82 PathProgramCache]: Analyzing trace with hash 125289734, now seen corresponding path program 29 times [2018-09-30 20:29:33,307 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:29:33,307 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:29:33,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:33,307 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:29:33,308 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:29:33,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:29:34,130 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:29:34,131 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:29:34,131 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:29:34,139 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown