java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1cc990c [2018-09-30 20:14:26,117 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-30 20:14:26,119 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-30 20:14:26,130 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-30 20:14:26,130 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-30 20:14:26,131 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-30 20:14:26,132 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-30 20:14:26,134 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-30 20:14:26,136 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-30 20:14:26,136 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-30 20:14:26,137 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-30 20:14:26,138 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-30 20:14:26,138 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-30 20:14:26,139 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-30 20:14:26,140 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-30 20:14:26,141 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-30 20:14:26,142 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-30 20:14:26,144 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-30 20:14:26,146 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-30 20:14:26,147 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-30 20:14:26,148 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-30 20:14:26,149 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-30 20:14:26,155 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-30 20:14:26,172 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 20:14:26,197 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-30 20:14:26,197 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-30 20:14:26,198 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-30 20:14:26,198 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-30 20:14:26,199 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-30 20:14:26,199 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-30 20:14:26,199 INFO L133 SettingsManager]: * Use SBE=true [2018-09-30 20:14:26,200 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-30 20:14:26,200 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-30 20:14:26,200 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-30 20:14:26,200 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-30 20:14:26,200 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-30 20:14:26,200 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-30 20:14:26,201 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-30 20:14:26,201 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-30 20:14:26,201 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-30 20:14:26,201 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-30 20:14:26,201 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-30 20:14:26,202 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-30 20:14:26,202 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-30 20:14:26,202 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-30 20:14:26,202 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-30 20:14:26,202 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 20:14:26,203 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-30 20:14:26,203 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-30 20:14:26,203 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-30 20:14:26,203 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-30 20:14:26,203 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-30 20:14:26,204 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-30 20:14:26,204 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-30 20:14:26,254 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-30 20:14:26,266 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-30 20:14:26,270 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-30 20:14:26,271 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-30 20:14:26,272 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-30 20:14:26,272 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl [2018-09-30 20:14:26,273 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl' [2018-09-30 20:14:26,334 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-30 20:14:26,337 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-30 20:14:26,338 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-30 20:14:26,338 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-30 20:14:26,338 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-30 20:14:26,359 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,371 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,377 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-30 20:14:26,378 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-30 20:14:26,378 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-30 20:14:26,379 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-30 20:14:26,390 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,391 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,391 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,397 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,398 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,399 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/1) ... [2018-09-30 20:14:26,401 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-30 20:14:26,402 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-30 20:14:26,402 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-30 20:14:26,402 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-30 20:14:26,408 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (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 20:14:26,467 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-30 20:14:26,467 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-30 20:14:26,708 INFO L348 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-30 20:14:26,709 INFO L202 PluginConnector]: Adding new model diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:14:26 BoogieIcfgContainer [2018-09-30 20:14:26,709 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-30 20:14:26,710 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-30 20:14:26,710 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-30 20:14:26,715 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-30 20:14:26,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:14:26" (1/2) ... [2018-09-30 20:14:26,717 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20d02323 and model type diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.09 08:14:26, skipping insertion in model container [2018-09-30 20:14:26,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:14:26" (2/2) ... [2018-09-30 20:14:26,719 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond1.i_3.bpl [2018-09-30 20:14:26,730 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-30 20:14:26,741 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-30 20:14:26,796 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-30 20:14:26,797 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-30 20:14:26,797 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-30 20:14:26,799 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-30 20:14:26,800 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-30 20:14:26,800 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-30 20:14:26,800 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-30 20:14:26,800 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-30 20:14:26,800 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-30 20:14:26,816 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-30 20:14:26,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-30 20:14:26,830 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:26,830 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-30 20:14:26,832 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:26,838 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:26,839 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-30 20:14:26,842 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:26,842 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:26,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:26,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:14:26,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:26,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:27,037 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 20:14:27,039 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 20:14:27,040 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-30 20:14:27,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-30 20:14:27,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-30 20:14:27,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 20:14:27,057 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-30 20:14:27,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:27,104 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-30 20:14:27,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-30 20:14:27,106 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-30 20:14:27,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:27,117 INFO L225 Difference]: With dead ends: 11 [2018-09-30 20:14:27,117 INFO L226 Difference]: Without dead ends: 7 [2018-09-30 20:14:27,120 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 20:14:27,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-30 20:14:27,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-30 20:14:27,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-30 20:14:27,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-30 20:14:27,157 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-30 20:14:27,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:27,157 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-30 20:14:27,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-30 20:14:27,158 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-30 20:14:27,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-30 20:14:27,158 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:27,158 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-30 20:14:27,159 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:27,159 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:27,159 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-30 20:14:27,159 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:27,159 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:27,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:27,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:14:27,161 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:27,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:27,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:27,390 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:27,390 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 20:14:27,414 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:14:27,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:27,463 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:27,568 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:27,602 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:27,602 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-30 20:14:27,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-30 20:14:27,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-30 20:14:27,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-30 20:14:27,606 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-30 20:14:27,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:27,720 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-30 20:14:27,721 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-30 20:14:27,721 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-30 20:14:27,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:27,722 INFO L225 Difference]: With dead ends: 11 [2018-09-30 20:14:27,722 INFO L226 Difference]: Without dead ends: 9 [2018-09-30 20:14:27,725 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-30 20:14:27,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-30 20:14:27,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-30 20:14:27,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-30 20:14:27,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-30 20:14:27,729 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-30 20:14:27,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:27,729 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-30 20:14:27,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-30 20:14:27,730 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-30 20:14:27,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-30 20:14:27,730 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:27,730 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-30 20:14:27,732 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:27,732 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:27,732 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-30 20:14:27,733 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:27,733 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:27,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:27,734 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:14:27,734 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:27,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:27,918 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 20:14:27,919 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:27,919 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 20:14:27,934 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:14:27,957 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:14:27,958 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:27,959 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:28,006 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 20:14:28,026 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:28,026 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-30 20:14:28,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-30 20:14:28,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-30 20:14:28,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:14:28,028 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-30 20:14:28,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:28,128 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-30 20:14:28,129 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-30 20:14:28,129 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-30 20:14:28,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:28,129 INFO L225 Difference]: With dead ends: 13 [2018-09-30 20:14:28,130 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 20:14:28,130 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:14:28,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 20:14:28,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-30 20:14:28,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-30 20:14:28,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-30 20:14:28,135 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-30 20:14:28,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:28,135 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-30 20:14:28,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-30 20:14:28,135 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-30 20:14:28,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-30 20:14:28,136 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:28,136 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-30 20:14:28,137 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:28,137 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:28,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-30 20:14:28,137 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:28,137 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:28,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:28,139 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:28,139 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:28,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:28,484 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:28,485 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:28,485 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 20:14:28,495 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:14:28,518 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-30 20:14:28,519 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:28,520 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:28,554 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:28,575 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:28,575 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-30 20:14:28,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-30 20:14:28,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-30 20:14:28,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:14:28,577 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-30 20:14:28,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:28,641 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-30 20:14:28,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-30 20:14:28,642 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-30 20:14:28,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:28,642 INFO L225 Difference]: With dead ends: 15 [2018-09-30 20:14:28,643 INFO L226 Difference]: Without dead ends: 13 [2018-09-30 20:14:28,643 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:14:28,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-30 20:14:28,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-30 20:14:28,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-30 20:14:28,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-30 20:14:28,648 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-30 20:14:28,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:28,648 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-30 20:14:28,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-30 20:14:28,649 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-30 20:14:28,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-30 20:14:28,649 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:28,649 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-30 20:14:28,650 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:28,650 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:28,650 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-30 20:14:28,650 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:28,651 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:28,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:28,652 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:28,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:28,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:28,868 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:28,868 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:28,868 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 20:14:28,878 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:14:28,902 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:14:28,902 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:28,904 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:28,926 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:28,946 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:28,947 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-30 20:14:28,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-30 20:14:28,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-30 20:14:28,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:14:28,948 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-30 20:14:29,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:29,068 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-30 20:14:29,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-30 20:14:29,069 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-30 20:14:29,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:29,069 INFO L225 Difference]: With dead ends: 17 [2018-09-30 20:14:29,070 INFO L226 Difference]: Without dead ends: 15 [2018-09-30 20:14:29,070 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:14:29,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-30 20:14:29,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-30 20:14:29,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-30 20:14:29,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-30 20:14:29,074 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-30 20:14:29,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:29,075 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-30 20:14:29,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-30 20:14:29,075 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-30 20:14:29,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-30 20:14:29,076 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:29,076 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-30 20:14:29,076 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:29,076 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:29,076 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-30 20:14:29,077 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:29,077 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:29,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:29,078 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:29,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:29,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:29,383 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:29,384 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:29,384 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 20:14:29,392 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:14:29,497 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-30 20:14:29,498 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:29,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:29,536 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:29,562 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:29,562 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-30 20:14:29,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-30 20:14:29,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-30 20:14:29,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-30 20:14:29,564 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-30 20:14:29,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:29,705 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-30 20:14:29,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-30 20:14:29,708 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-30 20:14:29,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:29,709 INFO L225 Difference]: With dead ends: 19 [2018-09-30 20:14:29,709 INFO L226 Difference]: Without dead ends: 17 [2018-09-30 20:14:29,710 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-30 20:14:29,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-30 20:14:29,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-30 20:14:29,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-30 20:14:29,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-30 20:14:29,716 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-30 20:14:29,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:29,716 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-30 20:14:29,716 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-30 20:14:29,716 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-30 20:14:29,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-30 20:14:29,717 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:29,717 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-30 20:14:29,718 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:29,718 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:29,718 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-30 20:14:29,718 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:29,718 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:29,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:29,719 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:29,720 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:29,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:30,244 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:30,245 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:30,245 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 20:14:30,259 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:14:30,292 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-30 20:14:30,293 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:30,295 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:30,324 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:30,346 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:30,346 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-30 20:14:30,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-30 20:14:30,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-30 20:14:30,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:14:30,348 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-30 20:14:30,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:30,441 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-30 20:14:30,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-30 20:14:30,445 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-30 20:14:30,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:30,445 INFO L225 Difference]: With dead ends: 21 [2018-09-30 20:14:30,445 INFO L226 Difference]: Without dead ends: 19 [2018-09-30 20:14:30,446 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:14:30,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-30 20:14:30,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-30 20:14:30,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-30 20:14:30,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-30 20:14:30,451 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-30 20:14:30,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:30,452 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-30 20:14:30,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-30 20:14:30,452 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-30 20:14:30,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-30 20:14:30,453 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:30,453 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-30 20:14:30,453 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:30,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:30,453 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-30 20:14:30,454 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:30,454 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:30,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:30,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:30,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:30,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:30,665 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:30,665 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:30,666 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 20:14:30,675 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:14:30,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:30,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:30,713 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:30,733 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:30,734 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-30 20:14:30,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 20:14:30,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 20:14:30,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:14:30,735 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-30 20:14:30,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:30,826 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-30 20:14:30,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 20:14:30,827 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-30 20:14:30,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:30,828 INFO L225 Difference]: With dead ends: 23 [2018-09-30 20:14:30,828 INFO L226 Difference]: Without dead ends: 21 [2018-09-30 20:14:30,829 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:14:30,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-30 20:14:30,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-30 20:14:30,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-30 20:14:30,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-30 20:14:30,834 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-30 20:14:30,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:30,834 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-30 20:14:30,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 20:14:30,835 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-30 20:14:30,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-30 20:14:30,835 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:30,835 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-30 20:14:30,836 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:30,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:30,836 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-30 20:14:30,836 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:30,836 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:30,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:30,837 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:14:30,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:30,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:31,145 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:31,145 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:31,145 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 20:14:31,154 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:14:31,178 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:14:31,179 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:31,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:31,198 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:31,219 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:31,219 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-30 20:14:31,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-30 20:14:31,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-30 20:14:31,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-30 20:14:31,220 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-30 20:14:31,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:31,379 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-30 20:14:31,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-30 20:14:31,380 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-30 20:14:31,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:31,382 INFO L225 Difference]: With dead ends: 25 [2018-09-30 20:14:31,382 INFO L226 Difference]: Without dead ends: 23 [2018-09-30 20:14:31,383 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-30 20:14:31,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-30 20:14:31,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-30 20:14:31,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-30 20:14:31,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-30 20:14:31,388 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-30 20:14:31,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:31,389 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-30 20:14:31,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-30 20:14:31,389 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-30 20:14:31,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-30 20:14:31,390 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:31,390 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-30 20:14:31,390 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:31,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:31,391 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-30 20:14:31,391 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:31,391 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:31,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:31,392 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:31,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:31,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:31,625 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:31,626 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:31,626 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 20:14:31,637 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:14:32,511 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-30 20:14:32,512 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:32,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:32,536 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:32,556 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:32,556 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-30 20:14:32,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-30 20:14:32,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-30 20:14:32,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-30 20:14:32,558 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-30 20:14:32,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:32,688 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-30 20:14:32,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-30 20:14:32,689 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-30 20:14:32,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:32,690 INFO L225 Difference]: With dead ends: 27 [2018-09-30 20:14:32,690 INFO L226 Difference]: Without dead ends: 25 [2018-09-30 20:14:32,691 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-30 20:14:32,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-30 20:14:32,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-30 20:14:32,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-30 20:14:32,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-30 20:14:32,696 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-30 20:14:32,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:32,696 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-30 20:14:32,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-30 20:14:32,697 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-30 20:14:32,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-30 20:14:32,697 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:32,697 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-30 20:14:32,698 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:32,698 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:32,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-30 20:14:32,698 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:32,698 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:32,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:32,699 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:32,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:32,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:33,009 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:33,009 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:33,009 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 20:14:33,017 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:14:33,050 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:14:33,051 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:33,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:33,133 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:33,165 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:33,165 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-30 20:14:33,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-30 20:14:33,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-30 20:14:33,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-30 20:14:33,166 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-30 20:14:33,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:33,512 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-30 20:14:33,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-30 20:14:33,512 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-30 20:14:33,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:33,514 INFO L225 Difference]: With dead ends: 29 [2018-09-30 20:14:33,514 INFO L226 Difference]: Without dead ends: 27 [2018-09-30 20:14:33,515 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-30 20:14:33,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-30 20:14:33,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-30 20:14:33,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-30 20:14:33,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-30 20:14:33,520 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-30 20:14:33,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:33,520 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-30 20:14:33,521 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-30 20:14:33,521 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-30 20:14:33,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-30 20:14:33,521 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:33,522 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-30 20:14:33,522 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:33,522 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:33,522 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-30 20:14:33,522 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:33,523 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:33,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:33,523 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:33,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:33,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:34,049 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:34,050 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:34,050 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 20:14:34,058 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:14:34,186 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-30 20:14:34,186 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:34,189 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:34,210 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:34,239 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:34,239 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-30 20:14:34,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-30 20:14:34,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-30 20:14:34,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-30 20:14:34,240 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-30 20:14:34,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:34,428 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-30 20:14:34,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-30 20:14:34,431 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-30 20:14:34,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:34,431 INFO L225 Difference]: With dead ends: 31 [2018-09-30 20:14:34,432 INFO L226 Difference]: Without dead ends: 29 [2018-09-30 20:14:34,432 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-30 20:14:34,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-30 20:14:34,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-30 20:14:34,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-30 20:14:34,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-30 20:14:34,439 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-30 20:14:34,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:34,439 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-30 20:14:34,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-30 20:14:34,439 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-30 20:14:34,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-30 20:14:34,440 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:34,440 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-30 20:14:34,440 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:34,440 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:34,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-30 20:14:34,441 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:34,441 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:34,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:34,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:34,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:34,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:34,699 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:34,699 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:34,699 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 20:14:34,708 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:14:35,771 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-30 20:14:35,771 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:35,775 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:35,795 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:35,816 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:35,816 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-30 20:14:35,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-30 20:14:35,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-30 20:14:35,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-30 20:14:35,817 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-30 20:14:36,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:36,169 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-30 20:14:36,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-30 20:14:36,169 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-30 20:14:36,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:36,170 INFO L225 Difference]: With dead ends: 33 [2018-09-30 20:14:36,170 INFO L226 Difference]: Without dead ends: 31 [2018-09-30 20:14:36,171 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-30 20:14:36,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-30 20:14:36,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-30 20:14:36,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-30 20:14:36,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-30 20:14:36,177 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-30 20:14:36,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:36,178 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-30 20:14:36,178 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-30 20:14:36,178 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-30 20:14:36,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-30 20:14:36,179 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:36,179 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-30 20:14:36,179 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:36,180 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:36,180 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-30 20:14:36,180 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:36,180 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:36,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:36,181 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:36,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:36,512 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:36,512 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:36,512 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 20:14:36,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:14:36,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:36,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:36,559 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:36,578 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:36,579 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-30 20:14:36,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-30 20:14:36,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-30 20:14:36,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-30 20:14:36,580 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-30 20:14:36,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:36,770 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-30 20:14:36,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-30 20:14:36,770 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-30 20:14:36,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:36,771 INFO L225 Difference]: With dead ends: 35 [2018-09-30 20:14:36,771 INFO L226 Difference]: Without dead ends: 33 [2018-09-30 20:14:36,772 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-30 20:14:36,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-30 20:14:36,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-30 20:14:36,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-30 20:14:36,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-30 20:14:36,778 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-30 20:14:36,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:36,779 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-30 20:14:36,779 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-30 20:14:36,779 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-30 20:14:36,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-30 20:14:36,780 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:36,780 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-30 20:14:36,780 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:36,780 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:36,781 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-30 20:14:36,781 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:36,781 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:36,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:36,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:14:36,782 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:36,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:37,378 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 20:14:37,378 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:37,378 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 20:14:37,388 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:14:37,404 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:14:37,404 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:37,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:37,441 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 20:14:37,471 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:37,471 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-30 20:14:37,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-30 20:14:37,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-30 20:14:37,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-30 20:14:37,472 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-30 20:14:37,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:37,885 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-30 20:14:37,886 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-30 20:14:37,886 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-30 20:14:37,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:37,887 INFO L225 Difference]: With dead ends: 37 [2018-09-30 20:14:37,887 INFO L226 Difference]: Without dead ends: 35 [2018-09-30 20:14:37,888 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-30 20:14:37,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-30 20:14:37,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-30 20:14:37,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-30 20:14:37,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-30 20:14:37,895 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-30 20:14:37,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:37,895 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-30 20:14:37,895 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-30 20:14:37,895 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-30 20:14:37,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-30 20:14:37,896 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:37,896 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-30 20:14:37,896 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:37,896 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:37,897 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-30 20:14:37,897 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:37,897 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:37,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:37,898 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:37,898 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:37,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:38,213 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:38,214 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:38,214 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 20:14:38,223 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:14:39,440 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-30 20:14:39,440 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:39,455 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:39,492 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:39,521 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:39,522 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-30 20:14:39,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-30 20:14:39,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-30 20:14:39,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-30 20:14:39,523 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-30 20:14:39,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:39,785 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-30 20:14:39,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-30 20:14:39,788 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-30 20:14:39,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:39,788 INFO L225 Difference]: With dead ends: 39 [2018-09-30 20:14:39,789 INFO L226 Difference]: Without dead ends: 37 [2018-09-30 20:14:39,789 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-30 20:14:39,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-30 20:14:39,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-30 20:14:39,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-30 20:14:39,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-30 20:14:39,794 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-30 20:14:39,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:39,794 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-30 20:14:39,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-30 20:14:39,795 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-30 20:14:39,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-30 20:14:39,795 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:39,795 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-30 20:14:39,795 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:39,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:39,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-30 20:14:39,796 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:39,796 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:39,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:39,796 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:39,797 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:39,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:40,198 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:40,199 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:40,199 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 20:14:40,206 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:14:40,252 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:14:40,253 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:14:40,255 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:14:40,297 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:40,326 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:14:40,326 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-30 20:14:40,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-30 20:14:40,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-30 20:14:40,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-30 20:14:40,327 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-30 20:14:40,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:14:40,596 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-30 20:14:40,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-30 20:14:40,603 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-30 20:14:40,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:14:40,603 INFO L225 Difference]: With dead ends: 41 [2018-09-30 20:14:40,603 INFO L226 Difference]: Without dead ends: 39 [2018-09-30 20:14:40,604 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-30 20:14:40,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-30 20:14:40,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-30 20:14:40,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-30 20:14:40,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-30 20:14:40,610 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-30 20:14:40,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:14:40,612 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-30 20:14:40,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-30 20:14:40,613 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-30 20:14:40,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-30 20:14:40,613 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:14:40,614 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-30 20:14:40,614 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:14:40,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:14:40,614 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-30 20:14:40,614 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:14:40,615 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:14:40,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:40,615 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:14:40,616 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:14:40,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:14:40,976 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:14:40,976 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:14:40,977 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 20:14:40,984 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:15:14,368 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-30 20:15:14,369 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:15:14,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:15:14,432 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:14,454 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:15:14,454 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-30 20:15:14,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-30 20:15:14,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-30 20:15:14,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-30 20:15:14,455 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-09-30 20:15:14,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:15:14,788 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-30 20:15:14,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-30 20:15:14,789 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-09-30 20:15:14,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:15:14,789 INFO L225 Difference]: With dead ends: 43 [2018-09-30 20:15:14,789 INFO L226 Difference]: Without dead ends: 41 [2018-09-30 20:15:14,790 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-30 20:15:14,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-30 20:15:14,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-30 20:15:14,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-30 20:15:14,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-30 20:15:14,795 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-09-30 20:15:14,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:15:14,796 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-30 20:15:14,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-30 20:15:14,796 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-30 20:15:14,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-30 20:15:14,797 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:15:14,797 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-09-30 20:15:14,797 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:15:14,797 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:15:14,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-09-30 20:15:14,798 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:15:14,798 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:15:14,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:14,799 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:15:14,799 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:14,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:15:15,720 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:15,720 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:15:15,720 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 20:15:15,729 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:15:16,835 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-30 20:15:16,835 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:15:16,842 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:15:16,862 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:16,882 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:15:16,882 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-09-30 20:15:16,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-30 20:15:16,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-30 20:15:16,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-30 20:15:16,884 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 21 states. [2018-09-30 20:15:17,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:15:17,719 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-30 20:15:17,720 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-30 20:15:17,720 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2018-09-30 20:15:17,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:15:17,721 INFO L225 Difference]: With dead ends: 45 [2018-09-30 20:15:17,721 INFO L226 Difference]: Without dead ends: 43 [2018-09-30 20:15:17,721 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-30 20:15:17,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-30 20:15:17,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-30 20:15:17,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-30 20:15:17,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-09-30 20:15:17,726 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-09-30 20:15:17,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:15:17,727 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-09-30 20:15:17,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-30 20:15:17,727 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-09-30 20:15:17,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-30 20:15:17,728 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:15:17,728 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1] [2018-09-30 20:15:17,728 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:15:17,728 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:15:17,728 INFO L82 PathProgramCache]: Analyzing trace with hash -1737087723, now seen corresponding path program 19 times [2018-09-30 20:15:17,728 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:15:17,729 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:15:17,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:17,730 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:15:17,730 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:17,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:15:18,149 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:18,150 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:15:18,150 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 20:15:18,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:15:18,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:15:18,180 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:15:18,216 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:18,241 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:15:18,241 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-30 20:15:18,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-30 20:15:18,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-30 20:15:18,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-30 20:15:18,242 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 22 states. [2018-09-30 20:15:18,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:15:18,731 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-30 20:15:18,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-30 20:15:18,733 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 42 [2018-09-30 20:15:18,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:15:18,734 INFO L225 Difference]: With dead ends: 47 [2018-09-30 20:15:18,734 INFO L226 Difference]: Without dead ends: 45 [2018-09-30 20:15:18,734 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-30 20:15:18,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-30 20:15:18,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-09-30 20:15:18,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-30 20:15:18,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-30 20:15:18,740 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-09-30 20:15:18,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:15:18,740 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-30 20:15:18,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-30 20:15:18,741 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-30 20:15:18,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-30 20:15:18,741 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:15:18,741 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1] [2018-09-30 20:15:18,742 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:15:18,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:15:18,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1401028431, now seen corresponding path program 20 times [2018-09-30 20:15:18,742 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:15:18,742 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:15:18,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:18,743 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:15:18,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:18,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:15:19,164 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:19,164 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:15:19,165 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 20:15:19,178 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:15:19,204 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:15:19,204 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:15:19,206 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:15:19,223 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:19,245 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:15:19,245 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-30 20:15:19,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-30 20:15:19,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-30 20:15:19,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-30 20:15:19,246 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 23 states. [2018-09-30 20:15:19,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:15:19,597 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-30 20:15:19,597 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-30 20:15:19,597 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-09-30 20:15:19,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:15:19,598 INFO L225 Difference]: With dead ends: 49 [2018-09-30 20:15:19,598 INFO L226 Difference]: Without dead ends: 47 [2018-09-30 20:15:19,598 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-30 20:15:19,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-30 20:15:19,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-30 20:15:19,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-30 20:15:19,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-09-30 20:15:19,604 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-09-30 20:15:19,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:15:19,604 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-09-30 20:15:19,604 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-30 20:15:19,604 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-09-30 20:15:19,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-30 20:15:19,605 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:15:19,605 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1] [2018-09-30 20:15:19,605 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:15:19,607 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:15:19,608 INFO L82 PathProgramCache]: Analyzing trace with hash 2063610633, now seen corresponding path program 21 times [2018-09-30 20:15:19,608 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:15:19,608 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:15:19,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:19,609 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:15:19,609 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:19,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:15:20,399 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:20,399 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:15:20,399 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 20:15:20,409 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:15:22,752 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-09-30 20:15:22,752 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:15:22,811 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:15:22,861 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:22,881 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:15:22,882 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-09-30 20:15:22,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-30 20:15:22,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-30 20:15:22,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-30 20:15:22,883 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 24 states. [2018-09-30 20:15:23,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:15:23,243 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-30 20:15:23,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-30 20:15:23,244 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2018-09-30 20:15:23,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:15:23,245 INFO L225 Difference]: With dead ends: 51 [2018-09-30 20:15:23,245 INFO L226 Difference]: Without dead ends: 49 [2018-09-30 20:15:23,246 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-30 20:15:23,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-30 20:15:23,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-09-30 20:15:23,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-09-30 20:15:23,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-09-30 20:15:23,251 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-09-30 20:15:23,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:15:23,252 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-09-30 20:15:23,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-30 20:15:23,252 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-09-30 20:15:23,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-09-30 20:15:23,253 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:15:23,254 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1] [2018-09-30 20:15:23,254 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:15:23,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:15:23,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1145020349, now seen corresponding path program 22 times [2018-09-30 20:15:23,254 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:15:23,254 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:15:23,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:23,255 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:15:23,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:23,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:15:24,488 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:24,488 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:15:24,488 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 20:15:24,503 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:15:24,548 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:15:24,549 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:15:24,551 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:15:24,608 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:24,634 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:15:24,634 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-09-30 20:15:24,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-30 20:15:24,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-30 20:15:24,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-30 20:15:24,635 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 25 states. [2018-09-30 20:15:25,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:15:25,122 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-09-30 20:15:25,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-30 20:15:25,123 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 48 [2018-09-30 20:15:25,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:15:25,123 INFO L225 Difference]: With dead ends: 53 [2018-09-30 20:15:25,124 INFO L226 Difference]: Without dead ends: 51 [2018-09-30 20:15:25,124 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-30 20:15:25,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-30 20:15:25,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-30 20:15:25,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-30 20:15:25,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-30 20:15:25,130 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-09-30 20:15:25,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:15:25,130 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-30 20:15:25,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-30 20:15:25,131 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-30 20:15:25,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-30 20:15:25,131 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:15:25,131 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1] [2018-09-30 20:15:25,132 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:15:25,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:15:25,132 INFO L82 PathProgramCache]: Analyzing trace with hash -852875523, now seen corresponding path program 23 times [2018-09-30 20:15:25,132 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:15:25,132 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:15:25,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:25,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:15:25,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:15:25,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:15:25,654 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:15:25,654 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:15:25,654 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 20:15:25,665 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:16:56,375 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-09-30 20:16:56,375 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:16:57,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:16:57,096 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:16:57,101 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:16:57,102 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-09-30 20:16:57,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-30 20:16:57,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-30 20:16:57,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-30 20:16:57,103 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 26 states. [2018-09-30 20:16:57,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:16:57,687 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-09-30 20:16:57,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-30 20:16:57,688 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 50 [2018-09-30 20:16:57,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:16:57,689 INFO L225 Difference]: With dead ends: 55 [2018-09-30 20:16:57,689 INFO L226 Difference]: Without dead ends: 53 [2018-09-30 20:16:57,690 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-30 20:16:57,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-30 20:16:57,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-09-30 20:16:57,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-30 20:16:57,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-09-30 20:16:57,695 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-09-30 20:16:57,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:16:57,696 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-09-30 20:16:57,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-30 20:16:57,696 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-09-30 20:16:57,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-30 20:16:57,696 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:16:57,696 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1] [2018-09-30 20:16:57,697 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:16:57,697 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:16:57,697 INFO L82 PathProgramCache]: Analyzing trace with hash 725428023, now seen corresponding path program 24 times [2018-09-30 20:16:57,697 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:16:57,697 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:16:57,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:16:57,698 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:16:57,698 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:16:57,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:16:59,437 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:16:59,437 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:16:59,437 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 20:16:59,446 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:17:38,290 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-09-30 20:17:38,290 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:17:38,303 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:17:38,537 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:17:38,558 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:17:38,559 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-09-30 20:17:38,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-30 20:17:38,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-30 20:17:38,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-30 20:17:38,560 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 27 states. [2018-09-30 20:17:39,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:17:39,012 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-30 20:17:39,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-30 20:17:39,013 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 52 [2018-09-30 20:17:39,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:17:39,014 INFO L225 Difference]: With dead ends: 57 [2018-09-30 20:17:39,014 INFO L226 Difference]: Without dead ends: 55 [2018-09-30 20:17:39,015 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-30 20:17:39,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-30 20:17:39,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-30 20:17:39,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-30 20:17:39,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-09-30 20:17:39,020 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-09-30 20:17:39,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:17:39,020 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-09-30 20:17:39,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-30 20:17:39,020 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-09-30 20:17:39,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-30 20:17:39,021 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:17:39,021 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1] [2018-09-30 20:17:39,021 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:17:39,021 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:17:39,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1351680241, now seen corresponding path program 25 times [2018-09-30 20:17:39,022 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:17:39,022 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:17:39,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:17:39,022 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:17:39,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:17:39,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:17:39,622 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:17:39,622 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:17:39,622 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 20:17:39,630 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:17:39,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:17:39,658 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:17:39,693 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:17:39,718 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:17:39,718 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-09-30 20:17:39,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-30 20:17:39,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-30 20:17:39,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-30 20:17:39,719 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 28 states. [2018-09-30 20:17:40,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:17:40,213 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-09-30 20:17:40,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-30 20:17:40,215 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 54 [2018-09-30 20:17:40,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:17:40,216 INFO L225 Difference]: With dead ends: 59 [2018-09-30 20:17:40,216 INFO L226 Difference]: Without dead ends: 57 [2018-09-30 20:17:40,216 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-30 20:17:40,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-09-30 20:17:40,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-09-30 20:17:40,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-30 20:17:40,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-30 20:17:40,220 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-09-30 20:17:40,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:17:40,220 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-30 20:17:40,220 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-30 20:17:40,221 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-30 20:17:40,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-30 20:17:40,221 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:17:40,221 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1] [2018-09-30 20:17:40,222 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:17:40,222 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:17:40,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1884640299, now seen corresponding path program 26 times [2018-09-30 20:17:40,222 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:17:40,222 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:17:40,222 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:17:40,223 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:17:40,223 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:17:40,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:17:40,858 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:17:40,858 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:17:40,858 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 20:17:40,866 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:17:40,892 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:17:40,892 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:17:40,894 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:17:40,910 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:17:40,930 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:17:40,931 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-09-30 20:17:40,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-30 20:17:40,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-30 20:17:40,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-30 20:17:40,932 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 29 states. [2018-09-30 20:17:41,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:17:41,448 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-09-30 20:17:41,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-30 20:17:41,448 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 56 [2018-09-30 20:17:41,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:17:41,449 INFO L225 Difference]: With dead ends: 61 [2018-09-30 20:17:41,449 INFO L226 Difference]: Without dead ends: 59 [2018-09-30 20:17:41,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-30 20:17:41,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-30 20:17:41,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-30 20:17:41,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-30 20:17:41,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-09-30 20:17:41,455 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-09-30 20:17:41,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:17:41,455 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-09-30 20:17:41,455 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-30 20:17:41,455 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-09-30 20:17:41,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-30 20:17:41,456 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:17:41,456 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1] [2018-09-30 20:17:41,456 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:17:41,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:17:41,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1336819483, now seen corresponding path program 27 times [2018-09-30 20:17:41,457 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:17:41,457 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:17:41,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:17:41,458 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:17:41,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:17:41,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:17:42,190 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:17:42,190 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:17:42,190 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 20:17:42,199 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:18:00,258 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-09-30 20:18:00,258 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:18:00,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:18:00,324 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:18:00,347 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:18:00,347 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-09-30 20:18:00,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-30 20:18:00,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-30 20:18:00,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-30 20:18:00,348 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 30 states. [2018-09-30 20:18:00,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:18:00,908 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-30 20:18:00,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-30 20:18:00,908 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 58 [2018-09-30 20:18:00,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:18:00,909 INFO L225 Difference]: With dead ends: 63 [2018-09-30 20:18:00,909 INFO L226 Difference]: Without dead ends: 61 [2018-09-30 20:18:00,910 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-30 20:18:00,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-30 20:18:00,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-09-30 20:18:00,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-09-30 20:18:00,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-09-30 20:18:00,913 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-09-30 20:18:00,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:18:00,913 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-09-30 20:18:00,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-30 20:18:00,914 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-09-30 20:18:00,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-09-30 20:18:00,914 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:18:00,914 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1] [2018-09-30 20:18:00,915 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:18:00,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:18:00,915 INFO L82 PathProgramCache]: Analyzing trace with hash -488249569, now seen corresponding path program 28 times [2018-09-30 20:18:00,915 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:18:00,915 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:18:00,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:18:00,916 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:18:00,916 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:18:00,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:18:02,040 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:18:02,041 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:18:02,041 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 20:18:02,049 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:18:02,080 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:18:02,080 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:18:02,082 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:18:02,105 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:18:02,126 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:18:02,126 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-09-30 20:18:02,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-30 20:18:02,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-30 20:18:02,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-30 20:18:02,127 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 31 states. [2018-09-30 20:18:02,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:18:02,752 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-09-30 20:18:02,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-30 20:18:02,753 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 60 [2018-09-30 20:18:02,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:18:02,754 INFO L225 Difference]: With dead ends: 65 [2018-09-30 20:18:02,754 INFO L226 Difference]: Without dead ends: 63 [2018-09-30 20:18:02,755 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-30 20:18:02,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-30 20:18:02,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-30 20:18:02,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-30 20:18:02,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-30 20:18:02,760 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-09-30 20:18:02,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:18:02,760 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-30 20:18:02,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-30 20:18:02,760 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-30 20:18:02,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-30 20:18:02,761 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:18:02,761 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1] [2018-09-30 20:18:02,761 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:18:02,761 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:18:02,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1056348455, now seen corresponding path program 29 times [2018-09-30 20:18:02,762 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:18:02,762 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:18:02,762 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:18:02,762 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:18:02,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:18:02,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:18:04,140 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:18:04,140 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:18:04,141 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 20:18:04,150 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown