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/simple4.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1cc990c [2018-09-30 20:20:26,066 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-30 20:20:26,068 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-30 20:20:26,087 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-30 20:20:26,088 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-30 20:20:26,089 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-30 20:20:26,092 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-30 20:20:26,095 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-30 20:20:26,104 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-30 20:20:26,106 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-30 20:20:26,106 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-30 20:20:26,107 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-30 20:20:26,108 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-30 20:20:26,110 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-30 20:20:26,113 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-30 20:20:26,114 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-30 20:20:26,115 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-30 20:20:26,118 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-30 20:20:26,125 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-30 20:20:26,127 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-30 20:20:26,128 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-30 20:20:26,131 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-30 20:20:26,136 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-30 20:20:26,137 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-30 20:20:26,137 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-30 20:20:26,138 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-30 20:20:26,139 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-30 20:20:26,140 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-30 20:20:26,141 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-30 20:20:26,142 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-30 20:20:26,142 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-30 20:20:26,144 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-30 20:20:26,145 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-30 20:20:26,146 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-30 20:20:26,147 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-30 20:20:26,150 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-30 20:20:26,150 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-30 20:20:26,173 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-30 20:20:26,173 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-30 20:20:26,174 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-30 20:20:26,174 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-30 20:20:26,175 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-30 20:20:26,176 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-30 20:20:26,176 INFO L133 SettingsManager]: * Use SBE=true [2018-09-30 20:20:26,176 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-30 20:20:26,176 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-30 20:20:26,177 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-30 20:20:26,177 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-30 20:20:26,177 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-30 20:20:26,177 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-30 20:20:26,178 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-30 20:20:26,179 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-30 20:20:26,179 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-30 20:20:26,179 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-30 20:20:26,179 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-30 20:20:26,180 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-30 20:20:26,181 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-30 20:20:26,181 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-30 20:20:26,181 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-30 20:20:26,181 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 20:20:26,181 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-30 20:20:26,182 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-30 20:20:26,182 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-30 20:20:26,182 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-30 20:20:26,182 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-30 20:20:26,182 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-30 20:20:26,183 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-30 20:20:26,245 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-30 20:20:26,260 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-30 20:20:26,267 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-30 20:20:26,269 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-30 20:20:26,269 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-30 20:20:26,270 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/simple4.i_3.bpl [2018-09-30 20:20:26,270 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/simple4.i_3.bpl' [2018-09-30 20:20:26,331 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-30 20:20:26,335 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-30 20:20:26,336 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-30 20:20:26,336 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-30 20:20:26,336 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-30 20:20:26,357 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,369 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,376 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-30 20:20:26,377 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-30 20:20:26,377 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-30 20:20:26,378 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-30 20:20:26,388 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,388 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,389 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,389 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,392 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,394 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,394 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... [2018-09-30 20:20:26,396 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-30 20:20:26,396 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-30 20:20:26,397 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-30 20:20:26,397 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-30 20:20:26,398 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-30 20:20:26,462 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-30 20:20:26,463 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-30 20:20:26,615 INFO L348 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-30 20:20:26,615 INFO L202 PluginConnector]: Adding new model simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:20:26 BoogieIcfgContainer [2018-09-30 20:20:26,615 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-30 20:20:26,616 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-30 20:20:26,617 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-30 20:20:26,620 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-30 20:20:26,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 30.09 08:20:26" (1/2) ... [2018-09-30 20:20:26,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e7d95bd and model type simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.09 08:20:26, skipping insertion in model container [2018-09-30 20:20:26,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "simple4.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.09 08:20:26" (2/2) ... [2018-09-30 20:20:26,623 INFO L112 eAbstractionObserver]: Analyzing ICFG simple4.i_3.bpl [2018-09-30 20:20:26,633 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-30 20:20:26,641 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-30 20:20:26,693 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-30 20:20:26,694 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-30 20:20:26,695 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-30 20:20:26,695 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-30 20:20:26,695 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-30 20:20:26,695 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-30 20:20:26,695 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-30 20:20:26,696 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-30 20:20:26,696 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-30 20:20:26,712 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-30 20:20:26,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-30 20:20:26,719 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:26,720 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-30 20:20:26,721 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:26,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:26,728 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-30 20:20:26,731 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:26,731 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:26,790 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:26,791 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:26,791 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:26,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:26,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:26,933 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-30 20:20:26,933 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-30 20:20:26,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-30 20:20:26,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-30 20:20:26,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 20:20:26,954 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-30 20:20:26,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:26,990 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-30 20:20:26,993 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-30 20:20:26,995 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-30 20:20:26,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:27,009 INFO L225 Difference]: With dead ends: 11 [2018-09-30 20:20:27,009 INFO L226 Difference]: Without dead ends: 7 [2018-09-30 20:20:27,018 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-30 20:20:27,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-30 20:20:27,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-30 20:20:27,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-30 20:20:27,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-30 20:20:27,067 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-30 20:20:27,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:27,067 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-30 20:20:27,067 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-30 20:20:27,068 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-30 20:20:27,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-30 20:20:27,068 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:27,068 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-30 20:20:27,069 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:27,069 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:27,069 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-30 20:20:27,069 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:27,069 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:27,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:27,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:27,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:27,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:27,224 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:27,224 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:27,224 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:27,245 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:27,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:27,283 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:27,381 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:27,418 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:27,418 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-30 20:20:27,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-30 20:20:27,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-30 20:20:27,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-30 20:20:27,422 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-30 20:20:27,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:27,549 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-30 20:20:27,549 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-30 20:20:27,549 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-30 20:20:27,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:27,550 INFO L225 Difference]: With dead ends: 11 [2018-09-30 20:20:27,550 INFO L226 Difference]: Without dead ends: 9 [2018-09-30 20:20:27,553 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 [2018-09-30 20:20:27,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-30 20:20:27,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-30 20:20:27,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-30 20:20:27,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-30 20:20:27,558 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-30 20:20:27,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:27,559 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-30 20:20:27,559 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-30 20:20:27,559 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-30 20:20:27,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-30 20:20:27,562 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:27,562 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-30 20:20:27,562 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:27,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:27,563 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-30 20:20:27,563 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:27,563 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:27,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:27,569 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:27,571 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:27,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:27,792 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:27,792 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:27,792 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:27,804 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:20:27,820 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:20:27,820 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:27,821 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:27,837 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:27,856 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:27,857 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-30 20:20:27,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-30 20:20:27,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-30 20:20:27,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:20:27,858 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-30 20:20:27,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:27,918 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-30 20:20:27,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-30 20:20:27,919 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-30 20:20:27,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:27,919 INFO L225 Difference]: With dead ends: 13 [2018-09-30 20:20:27,920 INFO L226 Difference]: Without dead ends: 11 [2018-09-30 20:20:27,920 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-30 20:20:27,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-30 20:20:27,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-30 20:20:27,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-30 20:20:27,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-30 20:20:27,925 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-30 20:20:27,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:27,925 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-30 20:20:27,925 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-30 20:20:27,926 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-30 20:20:27,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-30 20:20:27,926 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:27,926 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-30 20:20:27,927 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:27,927 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:27,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-30 20:20:27,927 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:27,928 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:27,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:27,929 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:27,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:27,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:28,153 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:28,154 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:28,154 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:28,171 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:20:28,232 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-30 20:20:28,232 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:28,234 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:28,307 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:28,343 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:28,344 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-30 20:20:28,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-30 20:20:28,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-30 20:20:28,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:20:28,345 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-30 20:20:28,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:28,424 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-30 20:20:28,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-30 20:20:28,426 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-30 20:20:28,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:28,426 INFO L225 Difference]: With dead ends: 15 [2018-09-30 20:20:28,427 INFO L226 Difference]: Without dead ends: 13 [2018-09-30 20:20:28,427 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-30 20:20:28,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-30 20:20:28,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-30 20:20:28,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-30 20:20:28,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-30 20:20:28,432 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-30 20:20:28,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:28,432 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-30 20:20:28,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-30 20:20:28,433 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-30 20:20:28,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-30 20:20:28,433 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:28,433 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-30 20:20:28,434 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:28,434 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:28,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-30 20:20:28,434 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:28,435 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:28,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:28,436 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:28,436 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:28,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:28,581 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:28,581 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:28,581 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:28,589 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:20:28,611 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:20:28,612 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:28,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:28,694 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:28,726 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:28,726 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-30 20:20:28,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-30 20:20:28,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-30 20:20:28,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:20:28,728 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-30 20:20:28,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:28,813 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-30 20:20:28,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-30 20:20:28,814 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-30 20:20:28,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:28,815 INFO L225 Difference]: With dead ends: 17 [2018-09-30 20:20:28,815 INFO L226 Difference]: Without dead ends: 15 [2018-09-30 20:20:28,816 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-30 20:20:28,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-30 20:20:28,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-30 20:20:28,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-30 20:20:28,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-30 20:20:28,821 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-30 20:20:28,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:28,822 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-30 20:20:28,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-30 20:20:28,822 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-30 20:20:28,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-30 20:20:28,823 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:28,823 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-30 20:20:28,823 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:28,824 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:28,824 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-30 20:20:28,824 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:28,824 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:28,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:28,825 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:28,825 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:28,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:29,028 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:29,029 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:29,029 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:29,038 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:20:29,168 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-30 20:20:29,168 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:29,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:29,197 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:29,223 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:29,223 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-30 20:20:29,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-30 20:20:29,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-30 20:20:29,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-30 20:20:29,225 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-30 20:20:29,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:29,303 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-30 20:20:29,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-30 20:20:29,305 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-30 20:20:29,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:29,306 INFO L225 Difference]: With dead ends: 19 [2018-09-30 20:20:29,306 INFO L226 Difference]: Without dead ends: 17 [2018-09-30 20:20:29,307 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 [2018-09-30 20:20:29,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-30 20:20:29,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-30 20:20:29,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-30 20:20:29,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-30 20:20:29,313 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-30 20:20:29,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:29,313 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-30 20:20:29,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-30 20:20:29,314 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-30 20:20:29,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-30 20:20:29,314 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:29,315 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-30 20:20:29,315 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:29,315 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:29,315 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-30 20:20:29,316 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:29,316 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:29,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:29,317 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:29,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:29,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:29,940 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:29,941 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:29,941 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:29,956 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:20:30,001 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-30 20:20:30,001 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:30,004 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:30,030 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:30,053 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:30,053 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-30 20:20:30,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-30 20:20:30,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-30 20:20:30,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:20:30,054 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-30 20:20:30,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:30,243 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-30 20:20:30,245 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-30 20:20:30,246 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-30 20:20:30,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:30,247 INFO L225 Difference]: With dead ends: 21 [2018-09-30 20:20:30,247 INFO L226 Difference]: Without dead ends: 19 [2018-09-30 20:20:30,247 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-30 20:20:30,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-30 20:20:30,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-30 20:20:30,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-30 20:20:30,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-30 20:20:30,253 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-30 20:20:30,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:30,253 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-30 20:20:30,254 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-30 20:20:30,254 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-30 20:20:30,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-30 20:20:30,255 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:30,255 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-30 20:20:30,255 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:30,255 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:30,255 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-30 20:20:30,256 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:30,256 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:30,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:30,257 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:30,257 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:30,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:30,456 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:30,457 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:30,457 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:30,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:30,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:30,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:30,510 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:30,531 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:30,532 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-30 20:20:30,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-30 20:20:30,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-30 20:20:30,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:20:30,533 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-30 20:20:30,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:30,632 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-30 20:20:30,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-30 20:20:30,632 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-30 20:20:30,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:30,634 INFO L225 Difference]: With dead ends: 23 [2018-09-30 20:20:30,634 INFO L226 Difference]: Without dead ends: 21 [2018-09-30 20:20:30,635 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-30 20:20:30,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-30 20:20:30,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-30 20:20:30,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-30 20:20:30,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-30 20:20:30,639 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-30 20:20:30,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:30,640 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-30 20:20:30,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-30 20:20:30,640 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-30 20:20:30,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-30 20:20:30,641 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:30,641 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-30 20:20:30,642 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:30,642 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:30,642 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-30 20:20:30,642 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:30,642 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:30,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:30,643 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:20:30,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:30,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:31,021 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:31,021 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:31,021 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:31,030 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:20:31,063 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:20:31,063 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:31,065 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:31,081 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:31,103 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:31,103 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-30 20:20:31,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-30 20:20:31,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-30 20:20:31,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-30 20:20:31,105 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-30 20:20:31,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:31,262 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-30 20:20:31,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-30 20:20:31,263 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-30 20:20:31,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:31,264 INFO L225 Difference]: With dead ends: 25 [2018-09-30 20:20:31,264 INFO L226 Difference]: Without dead ends: 23 [2018-09-30 20:20:31,265 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 [2018-09-30 20:20:31,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-30 20:20:31,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-30 20:20:31,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-30 20:20:31,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-30 20:20:31,270 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-30 20:20:31,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:31,270 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-30 20:20:31,270 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-30 20:20:31,270 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-30 20:20:31,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-30 20:20:31,271 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:31,271 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-30 20:20:31,272 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:31,272 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:31,272 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-30 20:20:31,272 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:31,272 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:31,273 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:31,273 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:31,274 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:31,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:31,480 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:31,480 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:31,481 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:31,490 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:20:31,606 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-30 20:20:31,607 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:31,609 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:31,633 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:31,654 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:31,654 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-30 20:20:31,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-30 20:20:31,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-30 20:20:31,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-30 20:20:31,656 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-30 20:20:31,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:31,811 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-30 20:20:31,812 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-30 20:20:31,812 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-30 20:20:31,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:31,813 INFO L225 Difference]: With dead ends: 27 [2018-09-30 20:20:31,813 INFO L226 Difference]: Without dead ends: 25 [2018-09-30 20:20:31,814 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-30 20:20:31,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-30 20:20:31,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-30 20:20:31,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-30 20:20:31,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-30 20:20:31,820 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-30 20:20:31,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:31,820 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-30 20:20:31,820 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-30 20:20:31,821 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-30 20:20:31,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-30 20:20:31,821 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:31,821 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-30 20:20:31,822 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:31,822 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:31,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-30 20:20:31,822 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:31,823 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:31,823 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:31,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:31,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:31,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:32,021 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:32,022 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:32,022 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:32,031 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:20:32,051 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:20:32,051 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:20:32,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:20:32,078 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:32,099 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:20:32,099 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-30 20:20:32,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-30 20:20:32,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-30 20:20:32,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-30 20:20:32,100 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-30 20:20:32,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:20:32,379 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-30 20:20:32,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-30 20:20:32,380 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-30 20:20:32,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:20:32,381 INFO L225 Difference]: With dead ends: 29 [2018-09-30 20:20:32,382 INFO L226 Difference]: Without dead ends: 27 [2018-09-30 20:20:32,383 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-30 20:20:32,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-30 20:20:32,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-30 20:20:32,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-30 20:20:32,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-30 20:20:32,388 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-30 20:20:32,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:20:32,389 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-30 20:20:32,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-30 20:20:32,389 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-30 20:20:32,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-30 20:20:32,390 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:20:32,390 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-30 20:20:32,390 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:20:32,390 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:20:32,391 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-30 20:20:32,391 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:20:32,391 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:20:32,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:32,392 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:20:32,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:20:32,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:20:32,966 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:20:32,966 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:20:32,966 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:20:32,979 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:22:00,540 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-30 20:22:00,540 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:00,839 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:00,859 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:00,888 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:22:00,888 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-30 20:22:00,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-30 20:22:00,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-30 20:22:00,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-30 20:22:00,890 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-30 20:22:01,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:01,030 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-30 20:22:01,032 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-30 20:22:01,032 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-30 20:22:01,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:01,032 INFO L225 Difference]: With dead ends: 31 [2018-09-30 20:22:01,033 INFO L226 Difference]: Without dead ends: 29 [2018-09-30 20:22:01,033 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-30 20:22:01,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-30 20:22:01,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-30 20:22:01,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-30 20:22:01,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-30 20:22:01,040 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-30 20:22:01,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:01,040 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-30 20:22:01,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-30 20:22:01,041 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-30 20:22:01,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-30 20:22:01,042 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:01,042 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-30 20:22:01,042 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:01,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:01,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-30 20:22:01,043 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:01,043 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:01,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:01,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:01,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:01,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:22:01,354 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:01,355 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:22:01,355 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:22:01,368 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-30 20:22:02,012 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-30 20:22:02,013 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:02,016 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:02,037 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:02,068 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:22:02,068 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-30 20:22:02,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-30 20:22:02,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-30 20:22:02,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-30 20:22:02,069 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-30 20:22:02,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:02,387 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-30 20:22:02,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-30 20:22:02,388 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-30 20:22:02,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:02,389 INFO L225 Difference]: With dead ends: 33 [2018-09-30 20:22:02,389 INFO L226 Difference]: Without dead ends: 31 [2018-09-30 20:22:02,390 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-30 20:22:02,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-30 20:22:02,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-30 20:22:02,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-30 20:22:02,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-30 20:22:02,395 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-30 20:22:02,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:02,396 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-30 20:22:02,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-30 20:22:02,396 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-30 20:22:02,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-30 20:22:02,397 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:02,397 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-30 20:22:02,397 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:02,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:02,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-30 20:22:02,398 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:02,398 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:02,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:02,399 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:02,399 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:02,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:22:02,752 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:02,753 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:22:02,753 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:22:02,763 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:22:02,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:22:02,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:02,790 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:02,810 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:22:02,810 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-30 20:22:02,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-30 20:22:02,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-30 20:22:02,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-30 20:22:02,811 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-30 20:22:02,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:02,978 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-30 20:22:02,978 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-30 20:22:02,979 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-30 20:22:02,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:02,979 INFO L225 Difference]: With dead ends: 35 [2018-09-30 20:22:02,983 INFO L226 Difference]: Without dead ends: 33 [2018-09-30 20:22:02,983 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 [2018-09-30 20:22:02,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-30 20:22:02,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-30 20:22:02,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-30 20:22:02,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-30 20:22:02,989 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-30 20:22:02,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:02,989 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-30 20:22:02,989 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-30 20:22:02,989 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-30 20:22:02,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-30 20:22:02,990 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:02,990 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-30 20:22:02,991 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:02,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:02,991 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-30 20:22:02,991 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:02,991 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:02,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:02,992 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-30 20:22:02,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:03,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:22:03,325 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:03,326 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:22:03,326 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:22:03,336 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-30 20:22:03,366 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-30 20:22:03,367 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:03,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:03,408 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:03,429 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:22:03,429 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-30 20:22:03,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-30 20:22:03,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-30 20:22:03,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-30 20:22:03,430 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-30 20:22:03,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:03,837 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-30 20:22:03,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-30 20:22:03,838 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-30 20:22:03,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:03,839 INFO L225 Difference]: With dead ends: 37 [2018-09-30 20:22:03,839 INFO L226 Difference]: Without dead ends: 35 [2018-09-30 20:22:03,840 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-30 20:22:03,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-30 20:22:03,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-30 20:22:03,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-30 20:22:03,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-30 20:22:03,846 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-30 20:22:03,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:03,846 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-30 20:22:03,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-30 20:22:03,846 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-30 20:22:03,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-30 20:22:03,847 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:03,847 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-30 20:22:03,848 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:03,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:03,848 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-30 20:22:03,848 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:03,848 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:03,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:03,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:03,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:03,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:22:04,199 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:04,199 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:22:04,199 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:22:04,208 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-30 20:22:05,353 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-30 20:22:05,353 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:05,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:05,398 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:05,419 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:22:05,420 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-30 20:22:05,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-30 20:22:05,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-30 20:22:05,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-30 20:22:05,421 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-30 20:22:05,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:05,726 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-30 20:22:05,727 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-30 20:22:05,727 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-30 20:22:05,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:05,728 INFO L225 Difference]: With dead ends: 39 [2018-09-30 20:22:05,728 INFO L226 Difference]: Without dead ends: 37 [2018-09-30 20:22:05,728 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 [2018-09-30 20:22:05,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-30 20:22:05,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-30 20:22:05,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-30 20:22:05,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-30 20:22:05,733 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-30 20:22:05,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:05,733 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-30 20:22:05,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-30 20:22:05,733 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-30 20:22:05,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-30 20:22:05,734 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:05,734 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-30 20:22:05,735 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:05,735 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:05,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-30 20:22:05,735 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:05,735 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:05,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:05,736 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:05,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:05,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:22:06,160 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:06,160 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:22:06,160 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:22:06,168 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-30 20:22:06,193 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-30 20:22:06,194 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:22:06,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:22:06,252 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:06,274 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:22:06,274 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-30 20:22:06,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-30 20:22:06,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-30 20:22:06,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-30 20:22:06,275 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-30 20:22:06,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:22:06,522 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-30 20:22:06,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-30 20:22:06,529 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-30 20:22:06,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:22:06,529 INFO L225 Difference]: With dead ends: 41 [2018-09-30 20:22:06,529 INFO L226 Difference]: Without dead ends: 39 [2018-09-30 20:22:06,530 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-30 20:22:06,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-30 20:22:06,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-30 20:22:06,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-30 20:22:06,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-30 20:22:06,541 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-30 20:22:06,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:22:06,541 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-30 20:22:06,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-30 20:22:06,542 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-30 20:22:06,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-30 20:22:06,543 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:22:06,543 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-30 20:22:06,544 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:22:06,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:22:06,544 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-30 20:22:06,544 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:22:06,544 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:22:06,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:06,545 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:22:06,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:22:06,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:22:06,948 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:22:06,948 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:22:06,948 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:22:06,956 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-30 20:25:06,859 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-30 20:25:06,859 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-30 20:25:07,418 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-30 20:25:07,458 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (18)] Exception during sending of exit command (exit): Broken pipe [2018-09-30 20:25:07,463 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-30 20:25:07,463 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-30 20:25:07,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-30 20:25:07,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-30 20:25:07,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-30 20:25:07,465 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-09-30 20:25:07,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-30 20:25:07,827 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-30 20:25:07,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-30 20:25:07,827 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-09-30 20:25:07,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-30 20:25:07,828 INFO L225 Difference]: With dead ends: 43 [2018-09-30 20:25:07,828 INFO L226 Difference]: Without dead ends: 41 [2018-09-30 20:25:07,829 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-30 20:25:07,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-30 20:25:07,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-30 20:25:07,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-30 20:25:07,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-30 20:25:07,841 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-09-30 20:25:07,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-30 20:25:07,841 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-30 20:25:07,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-30 20:25:07,842 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-30 20:25:07,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-30 20:25:07,846 INFO L367 BasicCegarLoop]: Found error trace [2018-09-30 20:25:07,846 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-09-30 20:25:07,846 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-30 20:25:07,846 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-30 20:25:07,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-09-30 20:25:07,847 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-30 20:25:07,847 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-30 20:25:07,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:07,847 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-30 20:25:07,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-30 20:25:07,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-30 20:25:09,039 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-30 20:25:09,039 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-30 20:25:09,039 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-30 20:25:09,054 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown