java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-133090d [2018-10-04 09:16:47,376 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-04 09:16:47,378 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-04 09:16:47,392 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-04 09:16:47,393 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-04 09:16:47,394 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-04 09:16:47,395 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-04 09:16:47,397 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-04 09:16:47,398 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-04 09:16:47,399 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-04 09:16:47,400 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-04 09:16:47,400 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-04 09:16:47,401 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-04 09:16:47,402 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-04 09:16:47,403 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-04 09:16:47,404 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-04 09:16:47,405 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-04 09:16:47,407 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-04 09:16:47,408 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-04 09:16:47,413 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-04 09:16:47,414 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-04 09:16:47,418 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-04 09:16:47,420 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-04 09:16:47,433 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-10-04 09:16:47,448 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-04 09:16:47,448 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-04 09:16:47,449 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-04 09:16:47,449 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-04 09:16:47,449 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-04 09:16:47,450 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-04 09:16:47,450 INFO L133 SettingsManager]: * Use SBE=true [2018-10-04 09:16:47,450 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-04 09:16:47,450 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-04 09:16:47,450 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-04 09:16:47,450 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-04 09:16:47,451 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-04 09:16:47,451 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-04 09:16:47,451 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-04 09:16:47,451 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-04 09:16:47,451 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-04 09:16:47,452 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-04 09:16:47,452 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-04 09:16:47,452 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-04 09:16:47,452 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-04 09:16:47,452 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-04 09:16:47,453 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-04 09:16:47,453 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-04 09:16:47,453 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-04 09:16:47,453 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-04 09:16:47,453 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-04 09:16:47,454 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-04 09:16:47,454 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-04 09:16:47,454 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-04 09:16:47,454 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-04 09:16:47,505 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-04 09:16:47,517 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-04 09:16:47,520 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-04 09:16:47,522 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-04 09:16:47,523 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-04 09:16:47,524 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl [2018-10-04 09:16:47,524 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl' [2018-10-04 09:16:47,596 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-04 09:16:47,598 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-04 09:16:47,598 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-04 09:16:47,598 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-04 09:16:47,599 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-04 09:16:47,620 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,633 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,640 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-04 09:16:47,641 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-04 09:16:47,641 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-04 09:16:47,641 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-04 09:16:47,652 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,652 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,653 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,653 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,658 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,661 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,662 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... [2018-10-04 09:16:47,663 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-04 09:16:47,664 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-04 09:16:47,669 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-04 09:16:47,670 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-04 09:16:47,671 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-04 09:16:47,745 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-04 09:16:47,745 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-04 09:16:47,949 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-04 09:16:47,950 INFO L202 PluginConnector]: Adding new model functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 09:16:47 BoogieIcfgContainer [2018-10-04 09:16:47,950 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-04 09:16:47,951 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-04 09:16:47,951 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-04 09:16:47,954 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-04 09:16:47,955 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 04.10 09:16:47" (1/2) ... [2018-10-04 09:16:47,956 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42dcc97e and model type functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.10 09:16:47, skipping insertion in model container [2018-10-04 09:16:47,956 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.10 09:16:47" (2/2) ... [2018-10-04 09:16:47,958 INFO L112 eAbstractionObserver]: Analyzing ICFG functions1.i_3.bpl [2018-10-04 09:16:47,968 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-04 09:16:47,977 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-04 09:16:48,027 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-04 09:16:48,028 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-04 09:16:48,028 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-04 09:16:48,029 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-04 09:16:48,029 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-04 09:16:48,029 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-04 09:16:48,029 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-04 09:16:48,029 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-04 09:16:48,030 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-04 09:16:48,045 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-10-04 09:16:48,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-04 09:16:48,051 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:48,052 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-04 09:16:48,056 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:48,065 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:48,066 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-10-04 09:16:48,068 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:48,068 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:48,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:48,119 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:16:48,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:48,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:48,244 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:48,246 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-04 09:16:48,246 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-04 09:16:48,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-04 09:16:48,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-04 09:16:48,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 09:16:48,265 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-10-04 09:16:48,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:48,307 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-10-04 09:16:48,308 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-04 09:16:48,309 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-10-04 09:16:48,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:48,321 INFO L225 Difference]: With dead ends: 11 [2018-10-04 09:16:48,321 INFO L226 Difference]: Without dead ends: 7 [2018-10-04 09:16:48,325 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-04 09:16:48,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-04 09:16:48,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-04 09:16:48,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-04 09:16:48,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-04 09:16:48,373 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-10-04 09:16:48,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:48,374 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-04 09:16:48,374 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-04 09:16:48,374 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-04 09:16:48,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-04 09:16:48,375 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:48,375 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-10-04 09:16:48,375 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:48,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:48,376 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-10-04 09:16:48,376 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:48,376 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:48,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:48,377 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:16:48,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:48,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:48,538 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:48,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:48,539 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:48,548 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:16:48,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:48,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:16:48,637 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:48,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:16:48,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-10-04 09:16:48,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-04 09:16:48,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-04 09:16:48,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-04 09:16:48,671 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-10-04 09:16:48,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:48,780 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-04 09:16:48,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-04 09:16:48,781 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-10-04 09:16:48,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:48,783 INFO L225 Difference]: With dead ends: 11 [2018-10-04 09:16:48,783 INFO L226 Difference]: Without dead ends: 9 [2018-10-04 09:16:48,784 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 [2018-10-04 09:16:48,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-04 09:16:48,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-04 09:16:48,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-04 09:16:48,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-04 09:16:48,789 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-04 09:16:48,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:48,789 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-04 09:16:48,789 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-04 09:16:48,789 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-04 09:16:48,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-04 09:16:48,795 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:48,796 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-10-04 09:16:48,796 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:48,796 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:48,797 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-10-04 09:16:48,797 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:48,797 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:48,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:48,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:16:48,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:48,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:49,022 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:49,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:49,023 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:49,031 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 09:16:49,058 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 09:16:49,058 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:16:49,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:16:49,109 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:49,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:16:49,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-04 09:16:49,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-04 09:16:49,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-04 09:16:49,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-04 09:16:49,133 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-10-04 09:16:49,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:49,203 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-04 09:16:49,206 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-04 09:16:49,206 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-10-04 09:16:49,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:49,207 INFO L225 Difference]: With dead ends: 13 [2018-10-04 09:16:49,207 INFO L226 Difference]: Without dead ends: 11 [2018-10-04 09:16:49,208 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-04 09:16:49,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-04 09:16:49,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-04 09:16:49,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-04 09:16:49,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-04 09:16:49,212 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-10-04 09:16:49,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:49,212 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-04 09:16:49,213 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-04 09:16:49,213 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-04 09:16:49,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-04 09:16:49,213 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:49,213 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-10-04 09:16:49,214 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:49,214 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:49,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-10-04 09:16:49,214 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:49,215 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:49,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:49,216 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:16:49,216 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:49,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:49,577 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:49,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:49,578 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:49,589 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 09:16:49,640 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-04 09:16:49,640 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:16:49,642 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:16:49,662 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:49,685 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:16:49,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-04 09:16:49,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-04 09:16:49,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-04 09:16:49,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-04 09:16:49,687 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-10-04 09:16:49,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:49,748 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-04 09:16:49,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-04 09:16:49,749 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-10-04 09:16:49,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:49,750 INFO L225 Difference]: With dead ends: 15 [2018-10-04 09:16:49,751 INFO L226 Difference]: Without dead ends: 13 [2018-10-04 09:16:49,751 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-04 09:16:49,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-04 09:16:49,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-04 09:16:49,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-04 09:16:49,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-04 09:16:49,755 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-04 09:16:49,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:49,756 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-04 09:16:49,756 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-04 09:16:49,756 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-04 09:16:49,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-04 09:16:49,757 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:49,757 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-10-04 09:16:49,757 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:49,758 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:49,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-10-04 09:16:49,758 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:49,758 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:49,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:49,760 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:16:49,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:49,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:49,977 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:49,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:49,977 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:49,990 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 09:16:50,029 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 09:16:50,030 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:16:50,032 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:16:50,063 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:50,083 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:16:50,083 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-04 09:16:50,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-04 09:16:50,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-04 09:16:50,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-04 09:16:50,084 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-10-04 09:16:50,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:50,133 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-04 09:16:50,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-04 09:16:50,133 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-10-04 09:16:50,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:50,134 INFO L225 Difference]: With dead ends: 17 [2018-10-04 09:16:50,134 INFO L226 Difference]: Without dead ends: 15 [2018-10-04 09:16:50,135 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 [2018-10-04 09:16:50,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-04 09:16:50,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-04 09:16:50,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-04 09:16:50,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-04 09:16:50,140 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-04 09:16:50,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:50,140 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-04 09:16:50,140 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-04 09:16:50,141 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-04 09:16:50,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-04 09:16:50,141 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:50,141 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-10-04 09:16:50,142 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:50,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:50,142 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-10-04 09:16:50,142 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:50,142 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:50,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:50,143 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:16:50,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:50,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:50,343 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:50,343 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:50,344 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:50,352 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 09:16:50,687 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-04 09:16:50,687 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:16:50,690 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:16:50,728 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:50,758 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:16:50,758 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-04 09:16:50,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-04 09:16:50,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-04 09:16:50,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-04 09:16:50,759 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-10-04 09:16:51,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:51,187 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-04 09:16:51,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-04 09:16:51,188 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-10-04 09:16:51,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:51,189 INFO L225 Difference]: With dead ends: 19 [2018-10-04 09:16:51,189 INFO L226 Difference]: Without dead ends: 17 [2018-10-04 09:16:51,190 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-04 09:16:51,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-04 09:16:51,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-04 09:16:51,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-04 09:16:51,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-04 09:16:51,194 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-10-04 09:16:51,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:51,195 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-04 09:16:51,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-04 09:16:51,195 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-04 09:16:51,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-04 09:16:51,195 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:51,196 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-10-04 09:16:51,196 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:51,196 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:51,196 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-10-04 09:16:51,197 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:51,197 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:51,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:51,198 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:16:51,198 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:51,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:51,414 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:51,414 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:51,414 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:51,428 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 09:16:51,502 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-04 09:16:51,502 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:16:51,505 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:16:51,528 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:51,551 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:16:51,551 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-04 09:16:51,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-04 09:16:51,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-04 09:16:51,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-04 09:16:51,553 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-04 09:16:51,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:51,805 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-04 09:16:51,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-04 09:16:51,809 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-04 09:16:51,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:51,810 INFO L225 Difference]: With dead ends: 21 [2018-10-04 09:16:51,810 INFO L226 Difference]: Without dead ends: 19 [2018-10-04 09:16:51,810 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-04 09:16:51,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-04 09:16:51,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-04 09:16:51,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-04 09:16:51,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-04 09:16:51,815 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-10-04 09:16:51,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:51,816 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-04 09:16:51,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-04 09:16:51,816 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-04 09:16:51,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-04 09:16:51,816 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:51,817 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-10-04 09:16:51,817 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:51,817 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:51,817 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-10-04 09:16:51,818 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:51,818 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:51,818 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:51,819 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:16:51,819 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:51,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:52,203 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:52,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:52,204 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:52,213 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:16:52,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:52,239 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:16:52,252 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:52,273 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:16:52,273 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-04 09:16:52,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-04 09:16:52,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-04 09:16:52,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-04 09:16:52,274 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-10-04 09:16:52,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:52,443 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-04 09:16:52,444 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-04 09:16:52,444 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-10-04 09:16:52,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:52,445 INFO L225 Difference]: With dead ends: 23 [2018-10-04 09:16:52,445 INFO L226 Difference]: Without dead ends: 21 [2018-10-04 09:16:52,445 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-04 09:16:52,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-04 09:16:52,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-04 09:16:52,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-04 09:16:52,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-04 09:16:52,451 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-10-04 09:16:52,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:52,451 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-04 09:16:52,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-04 09:16:52,452 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-04 09:16:52,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-04 09:16:52,452 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:52,452 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-10-04 09:16:52,453 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:52,453 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:52,453 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-10-04 09:16:52,453 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:52,453 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:52,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:52,454 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:16:52,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:52,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:52,861 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:52,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:52,861 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:52,871 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 09:16:52,904 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 09:16:52,905 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:16:52,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:16:52,928 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:52,950 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:16:52,950 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-04 09:16:52,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-04 09:16:52,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-04 09:16:52,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-04 09:16:52,952 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-10-04 09:16:53,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:16:53,083 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-04 09:16:53,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-04 09:16:53,085 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-10-04 09:16:53,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:16:53,086 INFO L225 Difference]: With dead ends: 25 [2018-10-04 09:16:53,086 INFO L226 Difference]: Without dead ends: 23 [2018-10-04 09:16:53,087 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 [2018-10-04 09:16:53,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-04 09:16:53,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-04 09:16:53,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-04 09:16:53,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-04 09:16:53,092 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-10-04 09:16:53,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:16:53,092 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-04 09:16:53,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-04 09:16:53,092 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-04 09:16:53,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-04 09:16:53,093 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:16:53,093 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-10-04 09:16:53,093 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:16:53,094 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:16:53,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-10-04 09:16:53,094 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:16:53,094 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:16:53,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:53,095 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:16:53,095 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:16:53,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:16:53,612 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:16:53,613 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:16:53,613 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:16:53,621 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 09:17:13,219 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-04 09:17:13,219 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:17:13,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:17:13,280 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:17:13,302 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:17:13,302 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-04 09:17:13,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-04 09:17:13,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-04 09:17:13,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-04 09:17:13,303 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-10-04 09:17:13,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:17:13,492 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-04 09:17:13,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-04 09:17:13,493 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-10-04 09:17:13,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:17:13,494 INFO L225 Difference]: With dead ends: 27 [2018-10-04 09:17:13,494 INFO L226 Difference]: Without dead ends: 25 [2018-10-04 09:17:13,495 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-04 09:17:13,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-04 09:17:13,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-04 09:17:13,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-04 09:17:13,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-04 09:17:13,501 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-10-04 09:17:13,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:17:13,501 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-04 09:17:13,501 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-04 09:17:13,502 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-04 09:17:13,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-04 09:17:13,502 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:17:13,502 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-10-04 09:17:13,503 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:17:13,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:17:13,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-10-04 09:17:13,503 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:17:13,503 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:17:13,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:17:13,504 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:17:13,505 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:17:13,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:17:13,719 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:17:13,720 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:17:13,720 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:17:13,729 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 09:17:13,761 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 09:17:13,761 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:17:13,764 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:17:13,821 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:17:13,841 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:17:13,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-04 09:17:13,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-04 09:17:13,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-04 09:17:13,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-04 09:17:13,843 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-10-04 09:17:14,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:17:14,109 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-04 09:17:14,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-04 09:17:14,110 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-10-04 09:17:14,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:17:14,111 INFO L225 Difference]: With dead ends: 29 [2018-10-04 09:17:14,111 INFO L226 Difference]: Without dead ends: 27 [2018-10-04 09:17:14,112 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-04 09:17:14,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-04 09:17:14,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-04 09:17:14,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-04 09:17:14,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-04 09:17:14,118 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-10-04 09:17:14,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:17:14,118 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-04 09:17:14,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-04 09:17:14,118 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-04 09:17:14,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-04 09:17:14,119 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:17:14,119 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-10-04 09:17:14,119 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:17:14,120 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:17:14,120 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-10-04 09:17:14,120 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:17:14,120 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:17:14,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:17:14,121 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:17:14,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:17:14,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:17:14,622 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:17:14,622 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:17:14,622 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:17:14,629 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 09:18:32,054 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-04 09:18:32,054 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:18:33,045 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:18:33,080 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:18:33,110 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:18:33,111 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-04 09:18:33,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-04 09:18:33,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-04 09:18:33,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-04 09:18:33,116 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-10-04 09:18:33,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:18:33,487 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-04 09:18:33,490 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-04 09:18:33,491 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-10-04 09:18:33,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:18:33,491 INFO L225 Difference]: With dead ends: 31 [2018-10-04 09:18:33,491 INFO L226 Difference]: Without dead ends: 29 [2018-10-04 09:18:33,492 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-04 09:18:33,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-04 09:18:33,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-04 09:18:33,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-04 09:18:33,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-04 09:18:33,497 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-10-04 09:18:33,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:18:33,497 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-04 09:18:33,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-04 09:18:33,497 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-04 09:18:33,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-04 09:18:33,498 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:18:33,498 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-10-04 09:18:33,498 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:18:33,499 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:18:33,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-10-04 09:18:33,499 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:18:33,499 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:18:33,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:18:33,500 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:18:33,500 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:18:33,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:18:34,337 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:18:34,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:18:34,337 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:18:34,345 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-04 09:18:54,417 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-04 09:18:54,417 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:18:54,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:18:54,522 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:18:54,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:18:54,544 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-04 09:18:54,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-04 09:18:54,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-04 09:18:54,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-04 09:18:54,545 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-10-04 09:18:54,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:18:54,722 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-04 09:18:54,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-04 09:18:54,722 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-10-04 09:18:54,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:18:54,723 INFO L225 Difference]: With dead ends: 33 [2018-10-04 09:18:54,723 INFO L226 Difference]: Without dead ends: 31 [2018-10-04 09:18:54,725 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-04 09:18:54,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-04 09:18:54,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-04 09:18:54,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-04 09:18:54,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-04 09:18:54,731 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-10-04 09:18:54,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:18:54,732 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-04 09:18:54,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-04 09:18:54,732 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-04 09:18:54,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-04 09:18:54,733 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:18:54,733 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-10-04 09:18:54,733 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:18:54,733 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:18:54,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-10-04 09:18:54,734 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:18:54,734 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:18:54,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:18:54,735 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:18:54,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:18:54,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:18:55,105 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:18:55,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:18:55,105 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:18:55,113 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:18:55,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:18:55,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:18:55,161 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:18:55,181 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:18:55,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-04 09:18:55,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-04 09:18:55,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-04 09:18:55,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-04 09:18:55,183 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-10-04 09:18:55,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:18:55,342 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-04 09:18:55,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-04 09:18:55,343 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-10-04 09:18:55,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:18:55,344 INFO L225 Difference]: With dead ends: 35 [2018-10-04 09:18:55,344 INFO L226 Difference]: Without dead ends: 33 [2018-10-04 09:18:55,345 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-04 09:18:55,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-04 09:18:55,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-04 09:18:55,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-04 09:18:55,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-04 09:18:55,350 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-10-04 09:18:55,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:18:55,351 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-04 09:18:55,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-04 09:18:55,351 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-04 09:18:55,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-04 09:18:55,352 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:18:55,352 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-10-04 09:18:55,352 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:18:55,352 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:18:55,353 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-10-04 09:18:55,353 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:18:55,353 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:18:55,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:18:55,354 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-04 09:18:55,354 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:18:55,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:18:55,898 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:18:55,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:18:55,899 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:18:55,908 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-04 09:18:55,937 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-04 09:18:55,938 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:18:55,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:18:55,965 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:18:55,997 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:18:55,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-04 09:18:55,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-04 09:18:55,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-04 09:18:55,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-04 09:18:55,998 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-10-04 09:18:56,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:18:56,319 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-04 09:18:56,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-04 09:18:56,319 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-10-04 09:18:56,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:18:56,320 INFO L225 Difference]: With dead ends: 37 [2018-10-04 09:18:56,320 INFO L226 Difference]: Without dead ends: 35 [2018-10-04 09:18:56,321 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-04 09:18:56,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-04 09:18:56,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-10-04 09:18:56,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-04 09:18:56,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-04 09:18:56,327 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-10-04 09:18:56,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:18:56,327 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-04 09:18:56,328 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-04 09:18:56,328 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-04 09:18:56,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-04 09:18:56,329 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:18:56,329 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-10-04 09:18:56,329 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:18:56,329 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:18:56,329 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-10-04 09:18:56,329 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:18:56,330 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:18:56,330 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:18:56,330 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:18:56,331 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:18:56,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:18:56,682 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:18:56,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:18:56,682 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:18:56,689 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-04 09:19:22,539 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-04 09:19:22,539 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:19:22,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:19:22,664 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:19:22,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:19:22,687 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-04 09:19:22,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-04 09:19:22,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-04 09:19:22,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-04 09:19:22,688 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-10-04 09:19:22,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:19:22,916 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-04 09:19:22,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-04 09:19:22,918 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-10-04 09:19:22,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:19:22,919 INFO L225 Difference]: With dead ends: 39 [2018-10-04 09:19:22,919 INFO L226 Difference]: Without dead ends: 37 [2018-10-04 09:19:22,920 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-04 09:19:22,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-04 09:19:22,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-04 09:19:22,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-04 09:19:22,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-10-04 09:19:22,927 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-10-04 09:19:22,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:19:22,927 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-10-04 09:19:22,927 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-04 09:19:22,927 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-10-04 09:19:22,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-04 09:19:22,928 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:19:22,928 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-10-04 09:19:22,929 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:19:22,929 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:19:22,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-10-04 09:19:22,929 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:19:22,929 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:19:22,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:19:22,930 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:19:22,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:19:22,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:19:23,762 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:19:23,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:19:23,762 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:19:23,770 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-04 09:19:23,812 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-04 09:19:23,813 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:19:23,816 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:19:23,831 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:19:23,857 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:19:23,857 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-04 09:19:23,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-04 09:19:23,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-04 09:19:23,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-04 09:19:23,858 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-10-04 09:19:24,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:19:24,115 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-04 09:19:24,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-04 09:19:24,116 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-10-04 09:19:24,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:19:24,118 INFO L225 Difference]: With dead ends: 41 [2018-10-04 09:19:24,118 INFO L226 Difference]: Without dead ends: 39 [2018-10-04 09:19:24,119 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-04 09:19:24,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-04 09:19:24,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-04 09:19:24,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-04 09:19:24,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-04 09:19:24,124 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-10-04 09:19:24,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:19:24,125 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-04 09:19:24,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-04 09:19:24,125 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-04 09:19:24,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-04 09:19:24,126 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:19:24,126 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-10-04 09:19:24,127 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:19:24,127 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:19:24,127 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-10-04 09:19:24,127 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:19:24,127 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:19:24,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:19:24,128 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:19:24,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:19:24,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:19:24,721 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:19:24,722 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:19:24,722 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:19:24,729 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-04 09:21:03,161 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-04 09:21:03,161 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-04 09:21:06,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-04 09:21:06,631 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:21:06,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-04 09:21:06,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-04 09:21:06,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-04 09:21:06,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-04 09:21:06,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-04 09:21:06,658 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-10-04 09:21:06,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-04 09:21:06,968 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-04 09:21:06,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-04 09:21:06,969 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-10-04 09:21:06,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-04 09:21:06,970 INFO L225 Difference]: With dead ends: 43 [2018-10-04 09:21:06,970 INFO L226 Difference]: Without dead ends: 41 [2018-10-04 09:21:06,971 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-04 09:21:06,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-04 09:21:06,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-04 09:21:06,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-04 09:21:06,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-04 09:21:06,978 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-10-04 09:21:06,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-04 09:21:06,978 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-04 09:21:06,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-04 09:21:06,978 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-04 09:21:06,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-04 09:21:06,979 INFO L367 BasicCegarLoop]: Found error trace [2018-10-04 09:21:06,979 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-10-04 09:21:06,980 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-04 09:21:06,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-04 09:21:06,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-10-04 09:21:06,980 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-04 09:21:06,980 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-04 09:21:06,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:21:06,981 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-04 09:21:06,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-04 09:21:06,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-04 09:21:08,127 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-04 09:21:08,128 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-04 09:21:08,128 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-04 09:21:08,148 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown