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 0.1.23-4eac566 [2018-09-23 19:39:14,051 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-23 19:39:14,055 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-23 19:39:14,071 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-23 19:39:14,071 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-23 19:39:14,072 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-23 19:39:14,073 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-23 19:39:14,075 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-23 19:39:14,078 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-23 19:39:14,079 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-23 19:39:14,088 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-23 19:39:14,089 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-23 19:39:14,090 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-23 19:39:14,091 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-23 19:39:14,092 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-23 19:39:14,097 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-23 19:39:14,098 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-23 19:39:14,100 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-23 19:39:14,107 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-23 19:39:14,109 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-23 19:39:14,113 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-23 19:39:14,115 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-23 19:39:14,117 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-23 19:39:14,132 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 [2018-09-23 19:39:14,159 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-23 19:39:14,159 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-23 19:39:14,161 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-23 19:39:14,161 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-23 19:39:14,162 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-23 19:39:14,162 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-23 19:39:14,162 INFO L133 SettingsManager]: * Use SBE=true [2018-09-23 19:39:14,163 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-23 19:39:14,164 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-23 19:39:14,164 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-23 19:39:14,164 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-23 19:39:14,164 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-23 19:39:14,165 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-23 19:39:14,165 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-23 19:39:14,165 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-23 19:39:14,165 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-23 19:39:14,166 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-23 19:39:14,167 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-23 19:39:14,167 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-23 19:39:14,167 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-23 19:39:14,167 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-23 19:39:14,168 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-23 19:39:14,168 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 19:39:14,168 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-23 19:39:14,168 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-23 19:39:14,169 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-23 19:39:14,169 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-23 19:39:14,169 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-23 19:39:14,169 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-23 19:39:14,170 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-23 19:39:14,231 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-23 19:39:14,245 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-23 19:39:14,252 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-23 19:39:14,254 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-23 19:39:14,255 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-23 19:39:14,255 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl [2018-09-23 19:39:14,256 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl' [2018-09-23 19:39:14,325 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-23 19:39:14,328 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-23 19:39:14,329 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-23 19:39:14,329 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-23 19:39:14,329 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-23 19:39:14,351 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 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,363 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 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,370 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-23 19:39:14,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-23 19:39:14,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-23 19:39:14,371 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-23 19:39:14,382 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,383 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,384 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,384 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,388 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,390 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,392 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (1/1) ... [2018-09-23 19:39:14,397 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-23 19:39:14,398 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-23 19:39:14,398 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-23 19:39:14,398 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-23 19:39:14,400 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (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 [2018-09-23 19:39:14,473 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-23 19:39:14,473 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-23 19:39:14,682 INFO L354 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-23 19:39:14,682 INFO L202 PluginConnector]: Adding new model diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 07:39:14 BoogieIcfgContainer [2018-09-23 19:39:14,682 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-23 19:39:14,683 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-23 19:39:14,685 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-23 19:39:14,688 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-23 19:39:14,688 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 07:39:14" (1/2) ... [2018-09-23 19:39:14,689 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d62f5af and model type diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.09 07:39:14, skipping insertion in model container [2018-09-23 19:39:14,689 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 07:39:14" (2/2) ... [2018-09-23 19:39:14,692 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond1.i_3.bpl [2018-09-23 19:39:14,703 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-23 19:39:14,711 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-23 19:39:14,769 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-23 19:39:14,770 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-23 19:39:14,770 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-23 19:39:14,770 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-23 19:39:14,770 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-23 19:39:14,770 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-23 19:39:14,771 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-23 19:39:14,771 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-23 19:39:14,771 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-23 19:39:14,789 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-23 19:39:14,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-23 19:39:14,804 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:14,805 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-23 19:39:14,810 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:14,821 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:14,821 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-23 19:39:14,824 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:14,825 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:14,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:14,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:39:14,872 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:14,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:15,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:15,020 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-23 19:39:15,021 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-23 19:39:15,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-23 19:39:15,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-23 19:39:15,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 19:39:15,041 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-23 19:39:15,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:15,091 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-23 19:39:15,092 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-23 19:39:15,094 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-23 19:39:15,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:15,108 INFO L225 Difference]: With dead ends: 11 [2018-09-23 19:39:15,109 INFO L226 Difference]: Without dead ends: 7 [2018-09-23 19:39:15,114 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 [2018-09-23 19:39:15,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-23 19:39:15,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-23 19:39:15,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-23 19:39:15,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-23 19:39:15,152 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-23 19:39:15,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:15,153 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-23 19:39:15,153 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-23 19:39:15,153 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-23 19:39:15,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-23 19:39:15,154 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:15,154 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-23 19:39:15,154 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:15,155 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:15,155 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-23 19:39:15,155 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:15,155 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:15,156 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:15,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:39:15,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:15,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:15,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:15,365 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:15,365 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 [2018-09-23 19:39:15,390 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:39:15,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:15,425 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:15,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:15,476 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:15,476 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-23 19:39:15,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-23 19:39:15,477 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-23 19:39:15,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-23 19:39:15,478 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-23 19:39:15,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:15,526 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-23 19:39:15,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-23 19:39:15,528 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-23 19:39:15,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:15,530 INFO L225 Difference]: With dead ends: 11 [2018-09-23 19:39:15,530 INFO L226 Difference]: Without dead ends: 9 [2018-09-23 19:39:15,532 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-23 19:39:15,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-23 19:39:15,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-23 19:39:15,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-23 19:39:15,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-23 19:39:15,538 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-23 19:39:15,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:15,538 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-23 19:39:15,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-23 19:39:15,539 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-23 19:39:15,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-23 19:39:15,539 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:15,539 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-23 19:39:15,540 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:15,540 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:15,540 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-23 19:39:15,540 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:15,541 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:15,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:15,542 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:39:15,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:15,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:15,719 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:15,720 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:15,720 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2018-09-23 19:39:15,739 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:39:15,762 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:39:15,762 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:15,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:15,785 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:15,806 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:15,806 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-23 19:39:15,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-23 19:39:15,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-23 19:39:15,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-23 19:39:15,807 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-23 19:39:15,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:15,906 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-23 19:39:15,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-23 19:39:15,907 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-23 19:39:15,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:15,907 INFO L225 Difference]: With dead ends: 13 [2018-09-23 19:39:15,907 INFO L226 Difference]: Without dead ends: 11 [2018-09-23 19:39:15,908 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 [2018-09-23 19:39:15,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-23 19:39:15,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-23 19:39:15,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-23 19:39:15,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-23 19:39:15,913 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-23 19:39:15,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:15,913 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-23 19:39:15,913 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-23 19:39:15,914 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-23 19:39:15,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-23 19:39:15,914 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:15,914 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-23 19:39:15,915 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:15,915 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:15,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-23 19:39:15,916 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:15,916 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:15,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:15,917 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:15,917 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:15,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:16,282 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:16,283 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:16,283 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 [2018-09-23 19:39:16,294 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:39:16,314 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-23 19:39:16,315 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:16,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:16,346 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:16,368 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:16,368 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-23 19:39:16,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-23 19:39:16,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-23 19:39:16,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-23 19:39:16,369 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-23 19:39:16,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:16,433 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-23 19:39:16,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-23 19:39:16,435 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-23 19:39:16,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:16,435 INFO L225 Difference]: With dead ends: 15 [2018-09-23 19:39:16,437 INFO L226 Difference]: Without dead ends: 13 [2018-09-23 19:39:16,437 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 [2018-09-23 19:39:16,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-23 19:39:16,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-23 19:39:16,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-23 19:39:16,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-23 19:39:16,450 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-23 19:39:16,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:16,450 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-23 19:39:16,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-23 19:39:16,451 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-23 19:39:16,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-23 19:39:16,451 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:16,451 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-23 19:39:16,451 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:16,452 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:16,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-23 19:39:16,452 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:16,452 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:16,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:16,454 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:16,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:16,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:17,011 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:17,012 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:17,012 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 [2018-09-23 19:39:17,020 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:39:17,047 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:39:17,048 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:17,050 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:17,130 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:17,155 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:17,156 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-23 19:39:17,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-23 19:39:17,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-23 19:39:17,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-23 19:39:17,157 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-23 19:39:17,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:17,282 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-23 19:39:17,282 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-23 19:39:17,283 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-23 19:39:17,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:17,283 INFO L225 Difference]: With dead ends: 17 [2018-09-23 19:39:17,284 INFO L226 Difference]: Without dead ends: 15 [2018-09-23 19:39:17,284 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-23 19:39:17,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-23 19:39:17,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-23 19:39:17,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-23 19:39:17,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-23 19:39:17,289 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-23 19:39:17,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:17,290 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-23 19:39:17,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-23 19:39:17,290 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-23 19:39:17,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-23 19:39:17,291 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:17,291 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-23 19:39:17,291 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:17,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:17,291 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-23 19:39:17,291 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:17,292 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:17,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:17,293 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:17,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:17,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:17,516 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:17,517 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:17,517 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 [2018-09-23 19:39:17,530 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:39:17,582 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-23 19:39:17,582 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:17,584 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:17,606 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:17,632 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:17,633 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-23 19:39:17,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-23 19:39:17,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-23 19:39:17,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-23 19:39:17,636 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-23 19:39:17,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:17,756 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-23 19:39:17,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-23 19:39:17,757 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-23 19:39:17,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:17,757 INFO L225 Difference]: With dead ends: 19 [2018-09-23 19:39:17,758 INFO L226 Difference]: Without dead ends: 17 [2018-09-23 19:39:17,758 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-23 19:39:17,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-23 19:39:17,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-23 19:39:17,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-23 19:39:17,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-23 19:39:17,763 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-23 19:39:17,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:17,763 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-23 19:39:17,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-23 19:39:17,764 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-23 19:39:17,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-23 19:39:17,764 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:17,764 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-23 19:39:17,765 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:17,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:17,765 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-23 19:39:17,765 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:17,765 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:17,766 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:17,766 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:17,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:17,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:18,063 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:18,064 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:18,064 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 [2018-09-23 19:39:18,086 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:39:18,201 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-23 19:39:18,202 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:18,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:18,288 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:18,321 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:18,321 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-23 19:39:18,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-23 19:39:18,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-23 19:39:18,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-23 19:39:18,323 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-23 19:39:18,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:18,452 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-23 19:39:18,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-23 19:39:18,456 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-23 19:39:18,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:18,457 INFO L225 Difference]: With dead ends: 21 [2018-09-23 19:39:18,457 INFO L226 Difference]: Without dead ends: 19 [2018-09-23 19:39:18,458 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-23 19:39:18,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-23 19:39:18,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-23 19:39:18,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-23 19:39:18,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-23 19:39:18,462 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-23 19:39:18,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:18,463 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-23 19:39:18,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-23 19:39:18,463 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-23 19:39:18,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-23 19:39:18,464 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:18,464 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-23 19:39:18,464 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:18,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:18,465 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-23 19:39:18,465 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:18,465 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:18,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:18,466 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:18,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:18,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:18,966 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:18,967 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:18,967 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 [2018-09-23 19:39:18,978 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:39:19,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:19,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:19,025 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:19,046 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:19,046 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-23 19:39:19,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-23 19:39:19,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-23 19:39:19,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-23 19:39:19,048 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-23 19:39:19,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:19,142 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-23 19:39:19,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 19:39:19,143 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-23 19:39:19,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:19,144 INFO L225 Difference]: With dead ends: 23 [2018-09-23 19:39:19,144 INFO L226 Difference]: Without dead ends: 21 [2018-09-23 19:39:19,145 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-23 19:39:19,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-23 19:39:19,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-23 19:39:19,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-23 19:39:19,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-23 19:39:19,150 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-23 19:39:19,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:19,150 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-23 19:39:19,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-23 19:39:19,150 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-23 19:39:19,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-23 19:39:19,151 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:19,151 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-23 19:39:19,151 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:19,152 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:19,152 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-23 19:39:19,152 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:19,152 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:19,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:19,153 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:39:19,153 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:19,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:19,497 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:19,498 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:19,498 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 [2018-09-23 19:39:19,506 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:39:19,520 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:39:19,520 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:19,522 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:19,538 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:19,559 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:19,559 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-23 19:39:19,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-23 19:39:19,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-23 19:39:19,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-23 19:39:19,560 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-23 19:39:19,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:19,731 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-23 19:39:19,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-23 19:39:19,732 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-23 19:39:19,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:19,734 INFO L225 Difference]: With dead ends: 25 [2018-09-23 19:39:19,734 INFO L226 Difference]: Without dead ends: 23 [2018-09-23 19:39:19,735 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-23 19:39:19,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-23 19:39:19,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-23 19:39:19,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-23 19:39:19,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-23 19:39:19,739 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-23 19:39:19,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:19,740 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-23 19:39:19,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-23 19:39:19,740 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-23 19:39:19,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-23 19:39:19,741 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:19,741 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-23 19:39:19,741 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:19,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:19,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-23 19:39:19,742 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:19,742 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:19,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:19,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:19,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:19,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:19,996 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:19,996 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:19,997 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 [2018-09-23 19:39:20,008 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:39:20,882 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-23 19:39:20,882 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:20,885 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:20,899 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:20,920 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:20,921 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-23 19:39:20,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-23 19:39:20,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-23 19:39:20,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-23 19:39:20,922 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-23 19:39:21,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:21,055 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-23 19:39:21,056 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-23 19:39:21,056 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-23 19:39:21,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:21,057 INFO L225 Difference]: With dead ends: 27 [2018-09-23 19:39:21,057 INFO L226 Difference]: Without dead ends: 25 [2018-09-23 19:39:21,057 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-23 19:39:21,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-23 19:39:21,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-23 19:39:21,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-23 19:39:21,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-23 19:39:21,064 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-23 19:39:21,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:21,065 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-23 19:39:21,065 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-23 19:39:21,065 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-23 19:39:21,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-23 19:39:21,065 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:21,066 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-23 19:39:21,066 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:21,066 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:21,066 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-23 19:39:21,066 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:21,066 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:21,067 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:21,067 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:21,068 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:21,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:21,496 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:21,496 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:21,496 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 [2018-09-23 19:39:21,504 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:39:21,528 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:39:21,528 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:21,531 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:21,606 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:21,636 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:21,637 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-23 19:39:21,637 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-23 19:39:21,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-23 19:39:21,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-23 19:39:21,638 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-23 19:39:21,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:21,978 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-23 19:39:21,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-23 19:39:21,979 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-23 19:39:21,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:21,980 INFO L225 Difference]: With dead ends: 29 [2018-09-23 19:39:21,981 INFO L226 Difference]: Without dead ends: 27 [2018-09-23 19:39:21,981 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-23 19:39:21,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-23 19:39:21,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-23 19:39:21,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-23 19:39:21,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-23 19:39:21,991 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-23 19:39:21,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:21,992 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-23 19:39:21,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-23 19:39:21,992 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-23 19:39:21,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-23 19:39:21,993 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:21,993 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-23 19:39:21,993 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:21,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:21,994 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-23 19:39:21,994 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:21,994 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:21,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:21,995 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:21,995 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:22,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:22,460 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:22,460 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:22,460 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 [2018-09-23 19:39:22,472 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:39:22,614 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-23 19:39:22,615 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:22,617 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:22,641 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:22,670 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:22,670 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-23 19:39:22,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-23 19:39:22,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-23 19:39:22,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-23 19:39:22,673 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-23 19:39:22,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:22,817 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-23 19:39:22,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-23 19:39:22,820 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-23 19:39:22,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:22,821 INFO L225 Difference]: With dead ends: 31 [2018-09-23 19:39:22,821 INFO L226 Difference]: Without dead ends: 29 [2018-09-23 19:39:22,822 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 [2018-09-23 19:39:22,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-23 19:39:22,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-23 19:39:22,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-23 19:39:22,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-23 19:39:22,828 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-23 19:39:22,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:22,828 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-23 19:39:22,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-23 19:39:22,828 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-23 19:39:22,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-23 19:39:22,829 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:22,829 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-23 19:39:22,829 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:22,830 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:22,830 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-23 19:39:22,830 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:22,830 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:22,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:22,831 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:22,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:22,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:23,120 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:23,121 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:23,121 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 [2018-09-23 19:39:23,130 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:39:24,180 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-23 19:39:24,181 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:24,185 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:24,200 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:24,221 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:24,222 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-23 19:39:24,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-23 19:39:24,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-23 19:39:24,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-23 19:39:24,223 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-23 19:39:24,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:24,581 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-23 19:39:24,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-23 19:39:24,581 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-23 19:39:24,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:24,583 INFO L225 Difference]: With dead ends: 33 [2018-09-23 19:39:24,583 INFO L226 Difference]: Without dead ends: 31 [2018-09-23 19:39:24,584 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 [2018-09-23 19:39:24,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-23 19:39:24,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-23 19:39:24,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-23 19:39:24,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-23 19:39:24,589 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-23 19:39:24,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:24,589 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-23 19:39:24,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-23 19:39:24,590 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-23 19:39:24,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-23 19:39:24,590 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:24,590 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-23 19:39:24,591 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:24,591 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:24,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-23 19:39:24,591 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:24,591 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:24,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:24,592 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:24,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:24,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:25,002 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:25,003 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:25,003 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 [2018-09-23 19:39:25,013 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:39:25,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:25,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:25,049 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:25,070 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:25,070 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-23 19:39:25,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-23 19:39:25,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-23 19:39:25,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-23 19:39:25,071 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-23 19:39:25,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:25,277 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-23 19:39:25,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-23 19:39:25,278 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-23 19:39:25,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:25,279 INFO L225 Difference]: With dead ends: 35 [2018-09-23 19:39:25,279 INFO L226 Difference]: Without dead ends: 33 [2018-09-23 19:39:25,280 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-23 19:39:25,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-23 19:39:25,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-23 19:39:25,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-23 19:39:25,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-23 19:39:25,287 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-23 19:39:25,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:25,287 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-23 19:39:25,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-23 19:39:25,287 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-23 19:39:25,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-23 19:39:25,288 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:25,288 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-23 19:39:25,289 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:25,289 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:25,289 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-23 19:39:25,289 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:25,289 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:25,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:25,290 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:39:25,290 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:25,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:25,972 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:25,972 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:25,972 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 [2018-09-23 19:39:25,982 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:39:25,998 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:39:25,998 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:26,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:26,032 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:26,063 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:26,063 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-23 19:39:26,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-23 19:39:26,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-23 19:39:26,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-23 19:39:26,065 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-23 19:39:26,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:26,501 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-23 19:39:26,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-23 19:39:26,502 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-23 19:39:26,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:26,503 INFO L225 Difference]: With dead ends: 37 [2018-09-23 19:39:26,503 INFO L226 Difference]: Without dead ends: 35 [2018-09-23 19:39:26,504 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-23 19:39:26,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-23 19:39:26,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-23 19:39:26,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-23 19:39:26,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-23 19:39:26,509 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-23 19:39:26,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:26,509 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-23 19:39:26,509 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-23 19:39:26,509 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-23 19:39:26,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-23 19:39:26,510 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:26,510 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-23 19:39:26,511 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:26,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:26,511 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-23 19:39:26,511 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:26,511 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:26,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:26,512 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:26,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:26,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:26,863 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:26,863 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:26,863 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 [2018-09-23 19:39:26,871 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:39:28,146 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-23 19:39:28,146 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:28,161 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:28,189 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:28,215 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:28,216 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-23 19:39:28,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-23 19:39:28,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-23 19:39:28,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-23 19:39:28,217 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-23 19:39:28,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:28,443 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-23 19:39:28,446 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-23 19:39:28,446 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-23 19:39:28,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:28,446 INFO L225 Difference]: With dead ends: 39 [2018-09-23 19:39:28,447 INFO L226 Difference]: Without dead ends: 37 [2018-09-23 19:39:28,447 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-23 19:39:28,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-23 19:39:28,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-23 19:39:28,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-23 19:39:28,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-23 19:39:28,452 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-23 19:39:28,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:28,452 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-23 19:39:28,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-23 19:39:28,452 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-23 19:39:28,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-23 19:39:28,453 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:28,453 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-23 19:39:28,453 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:28,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:28,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-23 19:39:28,454 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:28,454 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:28,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:28,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:28,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:28,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:28,871 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:28,871 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:28,872 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 [2018-09-23 19:39:28,880 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:39:28,923 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:39:28,924 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:39:28,926 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:39:28,957 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:28,981 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:39:28,981 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-23 19:39:28,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-23 19:39:28,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-23 19:39:28,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-23 19:39:28,982 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-23 19:39:29,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:39:29,245 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-23 19:39:29,247 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-23 19:39:29,247 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-23 19:39:29,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:39:29,248 INFO L225 Difference]: With dead ends: 41 [2018-09-23 19:39:29,248 INFO L226 Difference]: Without dead ends: 39 [2018-09-23 19:39:29,249 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 [2018-09-23 19:39:29,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-23 19:39:29,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-23 19:39:29,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-23 19:39:29,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-23 19:39:29,255 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-23 19:39:29,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:39:29,255 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-23 19:39:29,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-23 19:39:29,255 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-23 19:39:29,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-23 19:39:29,256 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:39:29,256 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-23 19:39:29,257 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:39:29,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:39:29,257 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-23 19:39:29,257 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:39:29,257 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:39:29,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:29,258 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:39:29,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:39:29,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:39:29,611 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:39:29,612 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:39:29,612 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 [2018-09-23 19:39:29,619 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:40:08,812 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-23 19:40:08,812 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:40:08,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:40:08,925 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:08,946 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:40:08,947 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-23 19:40:08,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-23 19:40:08,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-23 19:40:08,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-23 19:40:08,949 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-09-23 19:40:09,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:40:09,266 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-23 19:40:09,267 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-23 19:40:09,267 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-09-23 19:40:09,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:40:09,268 INFO L225 Difference]: With dead ends: 43 [2018-09-23 19:40:09,268 INFO L226 Difference]: Without dead ends: 41 [2018-09-23 19:40:09,269 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 [2018-09-23 19:40:09,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-23 19:40:09,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-23 19:40:09,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-23 19:40:09,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-23 19:40:09,275 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-09-23 19:40:09,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:40:09,275 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-23 19:40:09,275 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-23 19:40:09,276 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-23 19:40:09,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-23 19:40:09,276 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:40:09,276 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-09-23 19:40:09,277 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:40:09,277 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:40:09,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-09-23 19:40:09,277 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:40:09,277 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:40:09,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:09,278 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:40:09,278 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:09,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:40:09,725 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:09,725 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:40:09,725 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 [2018-09-23 19:40:09,734 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:40:10,853 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-23 19:40:10,854 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:40:10,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:40:10,906 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:10,937 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:40:10,937 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-09-23 19:40:10,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-23 19:40:10,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-23 19:40:10,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-23 19:40:10,938 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 21 states. [2018-09-23 19:40:11,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:40:11,800 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-23 19:40:11,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-23 19:40:11,801 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2018-09-23 19:40:11,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:40:11,802 INFO L225 Difference]: With dead ends: 45 [2018-09-23 19:40:11,802 INFO L226 Difference]: Without dead ends: 43 [2018-09-23 19:40:11,803 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-23 19:40:11,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-23 19:40:11,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-23 19:40:11,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-23 19:40:11,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-09-23 19:40:11,823 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-09-23 19:40:11,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:40:11,823 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-09-23 19:40:11,823 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-23 19:40:11,824 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-09-23 19:40:11,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-23 19:40:11,824 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:40:11,824 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1] [2018-09-23 19:40:11,825 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:40:11,825 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:40:11,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1737087723, now seen corresponding path program 19 times [2018-09-23 19:40:11,825 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:40:11,825 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:40:11,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:11,826 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:40:11,826 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:11,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:40:12,835 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:12,836 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:40:12,836 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 [2018-09-23 19:40:12,843 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:40:12,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:40:12,866 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:40:12,905 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:12,933 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:40:12,933 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-23 19:40:12,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-23 19:40:12,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-23 19:40:12,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-23 19:40:12,934 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 22 states. [2018-09-23 19:40:13,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:40:13,438 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-23 19:40:13,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-23 19:40:13,439 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 42 [2018-09-23 19:40:13,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:40:13,440 INFO L225 Difference]: With dead ends: 47 [2018-09-23 19:40:13,440 INFO L226 Difference]: Without dead ends: 45 [2018-09-23 19:40:13,441 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-23 19:40:13,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-23 19:40:13,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-09-23 19:40:13,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-23 19:40:13,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-23 19:40:13,447 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-09-23 19:40:13,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:40:13,447 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-23 19:40:13,447 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-23 19:40:13,447 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-23 19:40:13,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-23 19:40:13,448 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:40:13,448 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1] [2018-09-23 19:40:13,449 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:40:13,449 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:40:13,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1401028431, now seen corresponding path program 20 times [2018-09-23 19:40:13,449 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:40:13,449 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:40:13,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:13,450 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:40:13,450 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:13,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:40:14,108 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:14,109 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:40:14,109 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 [2018-09-23 19:40:14,124 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:40:14,143 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:40:14,144 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:40:14,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:40:14,169 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:14,191 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:40:14,191 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-23 19:40:14,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-23 19:40:14,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-23 19:40:14,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-23 19:40:14,192 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 23 states. [2018-09-23 19:40:14,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:40:14,552 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-23 19:40:14,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-23 19:40:14,553 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-09-23 19:40:14,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:40:14,553 INFO L225 Difference]: With dead ends: 49 [2018-09-23 19:40:14,553 INFO L226 Difference]: Without dead ends: 47 [2018-09-23 19:40:14,554 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-23 19:40:14,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-23 19:40:14,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-23 19:40:14,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-23 19:40:14,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-09-23 19:40:14,560 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-09-23 19:40:14,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:40:14,560 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-09-23 19:40:14,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-23 19:40:14,561 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-09-23 19:40:14,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-23 19:40:14,561 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:40:14,562 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1] [2018-09-23 19:40:14,562 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:40:14,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:40:14,562 INFO L82 PathProgramCache]: Analyzing trace with hash 2063610633, now seen corresponding path program 21 times [2018-09-23 19:40:14,562 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:40:14,562 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:40:14,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:14,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:40:14,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:14,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:40:15,054 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:15,054 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:40:15,054 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 [2018-09-23 19:40:15,063 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:40:17,379 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-09-23 19:40:17,379 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:40:17,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:40:17,482 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:17,503 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:40:17,503 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-09-23 19:40:17,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-23 19:40:17,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-23 19:40:17,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-23 19:40:17,504 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 24 states. [2018-09-23 19:40:18,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:40:18,036 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-23 19:40:18,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-23 19:40:18,037 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2018-09-23 19:40:18,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:40:18,038 INFO L225 Difference]: With dead ends: 51 [2018-09-23 19:40:18,038 INFO L226 Difference]: Without dead ends: 49 [2018-09-23 19:40:18,039 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-23 19:40:18,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-23 19:40:18,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-09-23 19:40:18,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-09-23 19:40:18,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-09-23 19:40:18,044 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-09-23 19:40:18,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:40:18,044 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-09-23 19:40:18,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-23 19:40:18,044 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-09-23 19:40:18,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-09-23 19:40:18,045 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:40:18,045 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1] [2018-09-23 19:40:18,045 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:40:18,046 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:40:18,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1145020349, now seen corresponding path program 22 times [2018-09-23 19:40:18,046 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:40:18,046 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:40:18,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:18,047 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:40:18,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:18,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:40:19,152 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:19,152 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:40:19,152 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 [2018-09-23 19:40:19,160 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:40:19,193 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:40:19,194 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:40:19,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:40:19,235 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:19,258 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:40:19,258 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-09-23 19:40:19,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-23 19:40:19,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-23 19:40:19,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-23 19:40:19,260 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 25 states. [2018-09-23 19:40:19,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:40:19,659 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-09-23 19:40:19,659 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-23 19:40:19,659 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 48 [2018-09-23 19:40:19,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:40:19,660 INFO L225 Difference]: With dead ends: 53 [2018-09-23 19:40:19,660 INFO L226 Difference]: Without dead ends: 51 [2018-09-23 19:40:19,661 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-23 19:40:19,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-23 19:40:19,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-23 19:40:19,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-23 19:40:19,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-23 19:40:19,667 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-09-23 19:40:19,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:40:19,668 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-23 19:40:19,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-23 19:40:19,668 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-23 19:40:19,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-23 19:40:19,668 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:40:19,668 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1] [2018-09-23 19:40:19,669 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:40:19,669 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:40:19,669 INFO L82 PathProgramCache]: Analyzing trace with hash -852875523, now seen corresponding path program 23 times [2018-09-23 19:40:19,669 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:40:19,669 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:40:19,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:19,670 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:40:19,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:40:19,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:40:20,366 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:40:20,366 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:40:20,366 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 [2018-09-23 19:40:20,374 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 19:41:54,386 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-09-23 19:41:54,386 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:41:55,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:41:55,114 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:41:55,141 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:41:55,142 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-09-23 19:41:55,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-23 19:41:55,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-23 19:41:55,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-23 19:41:55,143 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 26 states. [2018-09-23 19:41:55,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:41:55,607 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-09-23 19:41:55,608 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-23 19:41:55,608 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 50 [2018-09-23 19:41:55,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:41:55,609 INFO L225 Difference]: With dead ends: 55 [2018-09-23 19:41:55,609 INFO L226 Difference]: Without dead ends: 53 [2018-09-23 19:41:55,610 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-23 19:41:55,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-23 19:41:55,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-09-23 19:41:55,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-23 19:41:55,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-09-23 19:41:55,617 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-09-23 19:41:55,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:41:55,617 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-09-23 19:41:55,617 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-23 19:41:55,617 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-09-23 19:41:55,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-23 19:41:55,618 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:41:55,618 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1] [2018-09-23 19:41:55,618 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:41:55,618 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:41:55,618 INFO L82 PathProgramCache]: Analyzing trace with hash 725428023, now seen corresponding path program 24 times [2018-09-23 19:41:55,618 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:41:55,618 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:41:55,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:41:55,619 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:41:55,619 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:41:55,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:41:57,893 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:41:57,893 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:41:57,893 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 [2018-09-23 19:41:57,900 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 19:42:36,828 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-09-23 19:42:36,828 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:42:36,848 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:42:37,007 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:42:37,011 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:42:37,012 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-09-23 19:42:37,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-23 19:42:37,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-23 19:42:37,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-23 19:42:37,013 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 27 states. [2018-09-23 19:42:37,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:42:37,466 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-23 19:42:37,467 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-23 19:42:37,467 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 52 [2018-09-23 19:42:37,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:42:37,468 INFO L225 Difference]: With dead ends: 57 [2018-09-23 19:42:37,468 INFO L226 Difference]: Without dead ends: 55 [2018-09-23 19:42:37,469 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-23 19:42:37,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-23 19:42:37,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-23 19:42:37,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-23 19:42:37,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-09-23 19:42:37,476 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-09-23 19:42:37,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:42:37,476 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-09-23 19:42:37,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-23 19:42:37,476 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-09-23 19:42:37,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-23 19:42:37,477 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:42:37,477 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1] [2018-09-23 19:42:37,477 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:42:37,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:42:37,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1351680241, now seen corresponding path program 25 times [2018-09-23 19:42:37,478 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:42:37,478 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:42:37,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:42:37,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:42:37,479 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:42:37,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:42:38,375 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:42:38,376 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:42:38,376 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 [2018-09-23 19:42:38,383 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:42:38,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:42:38,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:42:38,425 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:42:38,448 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:42:38,448 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-09-23 19:42:38,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-23 19:42:38,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-23 19:42:38,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-23 19:42:38,449 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 28 states. [2018-09-23 19:42:38,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:42:38,934 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-09-23 19:42:38,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-23 19:42:38,935 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 54 [2018-09-23 19:42:38,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:42:38,936 INFO L225 Difference]: With dead ends: 59 [2018-09-23 19:42:38,936 INFO L226 Difference]: Without dead ends: 57 [2018-09-23 19:42:38,937 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-23 19:42:38,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-09-23 19:42:38,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-09-23 19:42:38,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-23 19:42:38,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-23 19:42:38,941 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-09-23 19:42:38,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:42:38,941 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-23 19:42:38,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-23 19:42:38,941 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-23 19:42:38,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-23 19:42:38,942 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:42:38,942 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1] [2018-09-23 19:42:38,942 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:42:38,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:42:38,942 INFO L82 PathProgramCache]: Analyzing trace with hash 1884640299, now seen corresponding path program 26 times [2018-09-23 19:42:38,942 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:42:38,943 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:42:38,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:42:38,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 19:42:38,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:42:38,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:42:40,288 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:42:40,288 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:42:40,288 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 [2018-09-23 19:42:40,296 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 19:42:40,325 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 19:42:40,325 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:42:40,326 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:42:40,362 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:42:40,384 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:42:40,384 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-09-23 19:42:40,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-23 19:42:40,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-23 19:42:40,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-23 19:42:40,385 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 29 states. [2018-09-23 19:42:40,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:42:40,920 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-09-23 19:42:40,920 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-23 19:42:40,921 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 56 [2018-09-23 19:42:40,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:42:40,921 INFO L225 Difference]: With dead ends: 61 [2018-09-23 19:42:40,922 INFO L226 Difference]: Without dead ends: 59 [2018-09-23 19:42:40,922 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-23 19:42:40,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-23 19:42:40,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-23 19:42:40,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-23 19:42:40,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-09-23 19:42:40,927 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-09-23 19:42:40,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:42:40,928 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-09-23 19:42:40,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-23 19:42:40,928 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-09-23 19:42:40,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-23 19:42:40,928 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:42:40,929 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1] [2018-09-23 19:42:40,929 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:42:40,929 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:42:40,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1336819483, now seen corresponding path program 27 times [2018-09-23 19:42:40,929 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:42:40,929 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:42:40,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:42:40,930 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:42:40,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:42:40,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:42:41,816 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:42:41,817 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:42:41,817 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 [2018-09-23 19:42:41,825 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 19:42:59,913 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-09-23 19:42:59,914 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:42:59,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:42:59,972 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:42:59,994 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:42:59,994 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-09-23 19:42:59,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-23 19:42:59,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-23 19:42:59,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-23 19:42:59,995 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 30 states. [2018-09-23 19:43:00,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:00,564 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-23 19:43:00,564 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-23 19:43:00,564 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 58 [2018-09-23 19:43:00,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:00,565 INFO L225 Difference]: With dead ends: 63 [2018-09-23 19:43:00,565 INFO L226 Difference]: Without dead ends: 61 [2018-09-23 19:43:00,566 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-23 19:43:00,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-23 19:43:00,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-09-23 19:43:00,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-09-23 19:43:00,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-09-23 19:43:00,570 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-09-23 19:43:00,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:00,571 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-09-23 19:43:00,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-23 19:43:00,571 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-09-23 19:43:00,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-09-23 19:43:00,572 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:00,572 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1] [2018-09-23 19:43:00,572 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:00,572 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:00,572 INFO L82 PathProgramCache]: Analyzing trace with hash -488249569, now seen corresponding path program 28 times [2018-09-23 19:43:00,572 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:00,572 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:00,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:00,573 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:00,573 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:00,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:01,491 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:43:01,491 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:01,491 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 [2018-09-23 19:43:01,499 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 19:43:01,529 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 19:43:01,529 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 19:43:01,531 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 19:43:01,566 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:43:01,587 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 19:43:01,588 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-09-23 19:43:01,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-23 19:43:01,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-23 19:43:01,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-23 19:43:01,589 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 31 states. [2018-09-23 19:43:02,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 19:43:02,261 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-09-23 19:43:02,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-23 19:43:02,262 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 60 [2018-09-23 19:43:02,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 19:43:02,263 INFO L225 Difference]: With dead ends: 65 [2018-09-23 19:43:02,263 INFO L226 Difference]: Without dead ends: 63 [2018-09-23 19:43:02,264 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-23 19:43:02,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-23 19:43:02,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-23 19:43:02,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-23 19:43:02,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-23 19:43:02,267 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-09-23 19:43:02,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 19:43:02,267 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-23 19:43:02,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-23 19:43:02,268 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-23 19:43:02,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-23 19:43:02,268 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 19:43:02,268 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1] [2018-09-23 19:43:02,268 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 19:43:02,269 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 19:43:02,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1056348455, now seen corresponding path program 29 times [2018-09-23 19:43:02,269 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 19:43:02,269 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 19:43:02,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:02,270 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 19:43:02,270 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 19:43:02,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 19:43:02,888 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 19:43:02,889 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 19:43:02,889 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 [2018-09-23 19:43:02,897 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown