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_PUPT.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/overflow1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d19836b [2018-09-26 21:51:21,714 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-26 21:51:21,717 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-26 21:51:21,728 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-26 21:51:21,729 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-26 21:51:21,730 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-26 21:51:21,731 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-26 21:51:21,733 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-26 21:51:21,734 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-26 21:51:21,735 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-26 21:51:21,736 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-09-26 21:51:21,771 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default_PUPT.epf [2018-09-26 21:51:21,789 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-26 21:51:21,789 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-26 21:51:21,790 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-26 21:51:21,790 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-26 21:51:21,791 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-26 21:51:21,791 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-26 21:51:21,791 INFO L133 SettingsManager]: * Use SBE=true [2018-09-26 21:51:21,792 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-26 21:51:21,792 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-26 21:51:21,792 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-26 21:51:21,792 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-26 21:51:21,792 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-26 21:51:21,793 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-26 21:51:21,793 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-26 21:51:21,793 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-26 21:51:21,793 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-26 21:51:21,794 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-26 21:51:21,794 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-26 21:51:21,794 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-26 21:51:21,794 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-26 21:51:21,794 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-26 21:51:21,795 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-26 21:51:21,795 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-26 21:51:21,795 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-26 21:51:21,795 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-26 21:51:21,796 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-26 21:51:21,796 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-26 21:51:21,796 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-26 21:51:21,796 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-26 21:51:21,796 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-26 21:51:21,797 INFO L133 SettingsManager]: * Use predicate trie based predicate unification=true [2018-09-26 21:51:21,851 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-26 21:51:21,867 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-26 21:51:21,874 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-26 21:51:21,875 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-26 21:51:21,876 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-26 21:51:21,877 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/overflow1.i_3.bpl [2018-09-26 21:51:21,877 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/overflow1.i_3.bpl' [2018-09-26 21:51:21,933 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-26 21:51:21,936 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-26 21:51:21,937 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-26 21:51:21,937 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-26 21:51:21,938 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-26 21:51:21,958 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,970 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,977 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-26 21:51:21,978 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-26 21:51:21,979 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-26 21:51:21,979 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-26 21:51:21,990 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,990 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,991 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,991 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,994 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,996 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,997 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... [2018-09-26 21:51:21,998 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-26 21:51:21,999 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-26 21:51:21,999 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-26 21:51:21,999 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-26 21:51:22,000 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-26 21:51:22,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-26 21:51:22,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-26 21:51:22,319 INFO L346 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-26 21:51:22,320 INFO L202 PluginConnector]: Adding new model overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:51:22 BoogieIcfgContainer [2018-09-26 21:51:22,320 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-26 21:51:22,321 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-26 21:51:22,322 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-26 21:51:22,325 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-26 21:51:22,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 26.09 09:51:21" (1/2) ... [2018-09-26 21:51:22,326 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4de29c49 and model type overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.09 09:51:22, skipping insertion in model container [2018-09-26 21:51:22,326 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "overflow1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.09 09:51:22" (2/2) ... [2018-09-26 21:51:22,328 INFO L112 eAbstractionObserver]: Analyzing ICFG overflow1.i_3.bpl [2018-09-26 21:51:22,336 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-26 21:51:22,345 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-26 21:51:22,392 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-26 21:51:22,393 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-26 21:51:22,393 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-26 21:51:22,393 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-26 21:51:22,393 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-26 21:51:22,394 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-26 21:51:22,394 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-26 21:51:22,394 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-26 21:51:22,394 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-26 21:51:22,409 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-26 21:51:22,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-26 21:51:22,416 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:22,416 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-26 21:51:22,418 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:22,425 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:22,426 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-26 21:51:22,428 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:22,428 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:22,473 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:22,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:51:22,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:22,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:22,600 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:22,603 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-26 21:51:22,603 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-26 21:51:22,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-26 21:51:22,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-26 21:51:22,619 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:22,620 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-26 21:51:22,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:22,740 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-26 21:51:22,741 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-26 21:51:22,743 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-26 21:51:22,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:22,769 INFO L225 Difference]: With dead ends: 11 [2018-09-26 21:51:22,770 INFO L226 Difference]: Without dead ends: 7 [2018-09-26 21:51:22,777 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:22,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-26 21:51:22,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-26 21:51:22,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-26 21:51:22,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-26 21:51:22,827 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-26 21:51:22,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:22,827 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-26 21:51:22,828 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-26 21:51:22,828 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-26 21:51:22,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-26 21:51:22,828 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:22,828 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-26 21:51:22,829 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:22,829 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:22,829 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-26 21:51:22,829 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:22,830 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:22,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:22,831 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:51:22,831 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:22,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:22,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:22,929 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:22,929 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:22,941 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:51:22,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:22,975 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:23,115 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:23,151 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:23,151 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-26 21:51:23,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-26 21:51:23,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-26 21:51:23,154 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:23,154 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-26 21:51:23,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:23,390 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-26 21:51:23,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-26 21:51:23,392 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-26 21:51:23,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:23,393 INFO L225 Difference]: With dead ends: 11 [2018-09-26 21:51:23,393 INFO L226 Difference]: Without dead ends: 9 [2018-09-26 21:51:23,394 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:23,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-26 21:51:23,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-26 21:51:23,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-26 21:51:23,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-26 21:51:23,399 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-26 21:51:23,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:23,400 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-26 21:51:23,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-26 21:51:23,400 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-26 21:51:23,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-26 21:51:23,401 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:23,401 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-26 21:51:23,402 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:23,402 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:23,402 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-26 21:51:23,402 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:23,403 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:23,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:23,404 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:51:23,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:23,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:23,548 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:23,549 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:23,549 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:23,565 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:51:23,584 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:51:23,585 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:51:23,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:23,645 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:23,675 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:23,675 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-26 21:51:23,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-26 21:51:23,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-26 21:51:23,676 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:23,677 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-26 21:51:24,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:24,074 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-26 21:51:24,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-26 21:51:24,075 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-26 21:51:24,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:24,076 INFO L225 Difference]: With dead ends: 13 [2018-09-26 21:51:24,076 INFO L226 Difference]: Without dead ends: 11 [2018-09-26 21:51:24,076 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:24,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-26 21:51:24,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-26 21:51:24,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-26 21:51:24,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-26 21:51:24,081 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-26 21:51:24,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:24,081 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-26 21:51:24,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-26 21:51:24,082 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-26 21:51:24,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-26 21:51:24,082 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:24,083 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-26 21:51:24,085 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:24,086 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:24,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-26 21:51:24,086 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:24,086 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:24,087 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:24,089 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:51:24,089 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:24,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:24,220 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:24,220 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:24,220 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:24,230 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:51:24,273 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-26 21:51:24,273 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:51:24,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:24,375 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:24,396 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:24,397 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-26 21:51:24,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-26 21:51:24,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-26 21:51:24,398 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:24,398 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-26 21:51:24,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:24,645 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-26 21:51:24,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-26 21:51:24,646 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-26 21:51:24,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:24,647 INFO L225 Difference]: With dead ends: 15 [2018-09-26 21:51:24,648 INFO L226 Difference]: Without dead ends: 13 [2018-09-26 21:51:24,648 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:24,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-26 21:51:24,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-26 21:51:24,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-26 21:51:24,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-26 21:51:24,652 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-26 21:51:24,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:24,653 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-26 21:51:24,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-26 21:51:24,653 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-26 21:51:24,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-26 21:51:24,654 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:24,654 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-26 21:51:24,654 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:24,654 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:24,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-26 21:51:24,655 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:24,655 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:24,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:24,656 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:51:24,656 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:24,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:24,787 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:24,787 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:24,788 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:24,796 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:51:24,803 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:51:24,803 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:51:24,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:24,903 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:24,923 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:24,924 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-26 21:51:24,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-26 21:51:24,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-26 21:51:24,924 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:24,925 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-26 21:51:25,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:25,618 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-26 21:51:25,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-26 21:51:25,619 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-26 21:51:25,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:25,620 INFO L225 Difference]: With dead ends: 17 [2018-09-26 21:51:25,620 INFO L226 Difference]: Without dead ends: 15 [2018-09-26 21:51:25,620 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:25,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-26 21:51:25,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-26 21:51:25,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-26 21:51:25,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-26 21:51:25,625 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-26 21:51:25,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:25,625 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-26 21:51:25,626 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-26 21:51:25,626 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-26 21:51:25,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-26 21:51:25,626 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:25,627 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-26 21:51:25,627 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:25,627 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:25,627 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-26 21:51:25,628 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:25,628 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:25,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:25,629 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:51:25,629 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:25,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:25,839 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:25,839 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:25,839 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:25,848 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:51:25,863 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-26 21:51:25,864 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:51:25,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:26,101 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:26,128 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:26,128 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-26 21:51:26,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-26 21:51:26,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-26 21:51:26,129 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:26,130 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-26 21:51:26,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:26,405 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-26 21:51:26,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-26 21:51:26,406 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-26 21:51:26,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:26,407 INFO L225 Difference]: With dead ends: 19 [2018-09-26 21:51:26,407 INFO L226 Difference]: Without dead ends: 17 [2018-09-26 21:51:26,408 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:26,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-26 21:51:26,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-26 21:51:26,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-26 21:51:26,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-26 21:51:26,413 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-26 21:51:26,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:26,413 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-26 21:51:26,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-26 21:51:26,413 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-26 21:51:26,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-26 21:51:26,414 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:26,414 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-26 21:51:26,415 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:26,415 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:26,415 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-26 21:51:26,415 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:26,415 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:26,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:26,416 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:51:26,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:26,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:26,684 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:26,685 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:26,685 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:26,699 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:51:26,714 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-26 21:51:26,715 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:51:26,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:26,833 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:26,860 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:26,860 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-26 21:51:26,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-26 21:51:26,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-26 21:51:26,861 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:26,862 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-26 21:51:27,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:27,146 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-26 21:51:27,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-26 21:51:27,150 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-26 21:51:27,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:27,151 INFO L225 Difference]: With dead ends: 21 [2018-09-26 21:51:27,151 INFO L226 Difference]: Without dead ends: 19 [2018-09-26 21:51:27,151 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:27,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-26 21:51:27,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-26 21:51:27,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-26 21:51:27,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-26 21:51:27,156 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-26 21:51:27,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:27,156 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-26 21:51:27,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-26 21:51:27,156 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-26 21:51:27,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-26 21:51:27,157 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:27,157 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-26 21:51:27,158 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:27,158 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:27,158 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-26 21:51:27,158 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:27,158 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:27,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:27,159 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:51:27,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:27,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:27,408 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:27,409 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:27,409 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:27,416 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:51:27,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:27,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:27,525 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:27,550 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:27,551 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-26 21:51:27,551 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-26 21:51:27,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-26 21:51:27,551 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:27,551 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-26 21:51:27,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:27,897 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-26 21:51:27,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-26 21:51:27,900 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-26 21:51:27,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:27,900 INFO L225 Difference]: With dead ends: 23 [2018-09-26 21:51:27,901 INFO L226 Difference]: Without dead ends: 21 [2018-09-26 21:51:27,901 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:27,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-26 21:51:27,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-26 21:51:27,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-26 21:51:27,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-26 21:51:27,905 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-26 21:51:27,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:27,906 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-26 21:51:27,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-26 21:51:27,906 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-26 21:51:27,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-26 21:51:27,907 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:27,907 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-26 21:51:27,907 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:27,907 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:27,907 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-26 21:51:27,907 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:27,907 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:27,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:27,909 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:51:27,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:27,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:28,194 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:28,194 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:28,194 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:28,206 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:51:28,216 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:51:28,216 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:51:28,218 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:28,286 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:28,306 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:28,306 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-26 21:51:28,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-26 21:51:28,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-26 21:51:28,307 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:28,307 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-26 21:51:28,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:28,712 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-26 21:51:28,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-26 21:51:28,716 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-26 21:51:28,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:28,717 INFO L225 Difference]: With dead ends: 25 [2018-09-26 21:51:28,717 INFO L226 Difference]: Without dead ends: 23 [2018-09-26 21:51:28,718 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:28,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-26 21:51:28,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-26 21:51:28,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-26 21:51:28,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-26 21:51:28,723 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-26 21:51:28,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:28,723 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-26 21:51:28,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-26 21:51:28,724 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-26 21:51:28,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-26 21:51:28,724 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:28,725 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-26 21:51:28,725 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:28,725 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:28,725 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-26 21:51:28,725 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:28,725 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:28,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:28,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:51:28,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:28,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:29,180 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:29,180 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:29,181 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:29,200 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:51:29,239 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-26 21:51:29,239 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:51:29,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:29,316 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:29,337 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:29,338 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-26 21:51:29,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-26 21:51:29,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-26 21:51:29,338 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:29,338 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-26 21:51:29,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:29,887 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-26 21:51:29,887 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-26 21:51:29,887 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-26 21:51:29,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:29,888 INFO L225 Difference]: With dead ends: 27 [2018-09-26 21:51:29,888 INFO L226 Difference]: Without dead ends: 25 [2018-09-26 21:51:29,888 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:29,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-26 21:51:29,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-26 21:51:29,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-26 21:51:29,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-26 21:51:29,893 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-26 21:51:29,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:29,894 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-26 21:51:29,894 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-26 21:51:29,894 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-26 21:51:29,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-26 21:51:29,895 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:29,895 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-26 21:51:29,895 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:29,896 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:29,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-26 21:51:29,896 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:29,896 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:29,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:29,897 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:51:29,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:29,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:30,136 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:30,137 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:30,137 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:30,145 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:51:30,166 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:51:30,166 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:51:30,168 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:51:30,291 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:30,312 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:51:30,312 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-26 21:51:30,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-26 21:51:30,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-26 21:51:30,313 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:51:30,313 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-26 21:51:32,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:51:32,084 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-26 21:51:32,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-26 21:51:32,085 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-26 21:51:32,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:51:32,086 INFO L225 Difference]: With dead ends: 29 [2018-09-26 21:51:32,086 INFO L226 Difference]: Without dead ends: 27 [2018-09-26 21:51:32,087 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:51:32,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-26 21:51:32,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-26 21:51:32,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-26 21:51:32,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-26 21:51:32,093 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-26 21:51:32,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:51:32,094 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-26 21:51:32,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-26 21:51:32,094 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-26 21:51:32,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-26 21:51:32,095 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:51:32,095 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-26 21:51:32,095 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:51:32,095 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:51:32,096 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-26 21:51:32,096 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:51:32,096 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:51:32,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:32,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:51:32,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:51:32,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:51:32,611 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:51:32,612 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:51:32,612 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:51:32,620 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:52:17,611 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-26 21:52:17,611 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:52:17,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:52:18,340 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:52:18,345 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:52:18,345 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-26 21:52:18,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-26 21:52:18,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-26 21:52:18,346 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:52:18,346 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-26 21:52:20,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:52:20,034 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-26 21:52:20,037 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-26 21:52:20,037 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-26 21:52:20,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:52:20,037 INFO L225 Difference]: With dead ends: 31 [2018-09-26 21:52:20,038 INFO L226 Difference]: Without dead ends: 29 [2018-09-26 21:52:20,038 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:52:20,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-26 21:52:20,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-26 21:52:20,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-26 21:52:20,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-26 21:52:20,042 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-26 21:52:20,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:52:20,043 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-26 21:52:20,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-26 21:52:20,043 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-26 21:52:20,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-26 21:52:20,044 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:52:20,044 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-26 21:52:20,044 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:52:20,044 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:52:20,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-26 21:52:20,044 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:52:20,044 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:52:20,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:52:20,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:52:20,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:52:20,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:52:20,414 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:52:20,415 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:52:20,415 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:52:20,430 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-26 21:52:45,226 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-26 21:52:45,226 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:52:45,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:52:45,426 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:52:45,447 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:52:45,447 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-26 21:52:45,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-26 21:52:45,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-26 21:52:45,448 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:52:45,448 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-26 21:52:46,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:52:46,283 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-26 21:52:46,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-26 21:52:46,284 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-26 21:52:46,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:52:46,285 INFO L225 Difference]: With dead ends: 33 [2018-09-26 21:52:46,286 INFO L226 Difference]: Without dead ends: 31 [2018-09-26 21:52:46,286 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:52:46,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-26 21:52:46,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-26 21:52:46,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-26 21:52:46,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-26 21:52:46,291 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-26 21:52:46,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:52:46,292 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-26 21:52:46,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-26 21:52:46,292 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-26 21:52:46,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-26 21:52:46,293 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:52:46,293 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-26 21:52:46,293 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:52:46,293 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:52:46,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-26 21:52:46,294 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:52:46,294 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:52:46,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:52:46,295 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:52:46,295 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:52:46,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:52:47,169 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:52:47,169 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:52:47,170 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:52:47,179 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:52:47,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:52:47,205 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:52:47,403 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:52:47,424 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:52:47,424 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-26 21:52:47,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-26 21:52:47,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-26 21:52:47,425 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:52:47,425 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-26 21:52:48,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:52:48,953 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-26 21:52:48,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-26 21:52:48,954 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-26 21:52:48,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:52:48,955 INFO L225 Difference]: With dead ends: 35 [2018-09-26 21:52:48,955 INFO L226 Difference]: Without dead ends: 33 [2018-09-26 21:52:48,955 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:52:48,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-26 21:52:48,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-26 21:52:48,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-26 21:52:48,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-26 21:52:48,961 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-26 21:52:48,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:52:48,961 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-26 21:52:48,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-26 21:52:48,961 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-26 21:52:48,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-26 21:52:48,962 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:52:48,962 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-26 21:52:48,963 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:52:48,963 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:52:48,963 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-26 21:52:48,963 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:52:48,963 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:52:48,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:52:48,964 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-26 21:52:48,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:52:48,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:52:49,558 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:52:49,559 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:52:49,559 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:52:49,570 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-26 21:52:49,586 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-26 21:52:49,587 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:52:49,589 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:52:50,065 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:52:50,086 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:52:50,086 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-26 21:52:50,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-26 21:52:50,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-26 21:52:50,087 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:52:50,087 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-26 21:52:51,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:52:51,099 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-26 21:52:51,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-26 21:52:51,101 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-26 21:52:51,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:52:51,101 INFO L225 Difference]: With dead ends: 37 [2018-09-26 21:52:51,102 INFO L226 Difference]: Without dead ends: 35 [2018-09-26 21:52:51,102 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:52:51,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-26 21:52:51,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-26 21:52:51,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-26 21:52:51,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-26 21:52:51,107 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-26 21:52:51,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:52:51,107 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-26 21:52:51,107 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-26 21:52:51,107 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-26 21:52:51,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-26 21:52:51,108 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:52:51,108 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-26 21:52:51,108 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:52:51,109 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:52:51,109 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-26 21:52:51,109 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:52:51,109 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:52:51,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:52:51,110 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:52:51,110 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:52:51,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:52:51,682 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:52:51,682 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:52:51,683 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:52:51,691 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-26 21:53:49,005 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-26 21:53:49,005 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:53:49,394 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:53:49,478 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:53:49,499 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:53:49,499 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-26 21:53:49,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-26 21:53:49,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-26 21:53:49,500 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:53:49,500 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-26 21:53:50,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:53:50,629 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-26 21:53:50,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-26 21:53:50,631 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-26 21:53:50,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:53:50,631 INFO L225 Difference]: With dead ends: 39 [2018-09-26 21:53:50,631 INFO L226 Difference]: Without dead ends: 37 [2018-09-26 21:53:50,632 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:53:50,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-26 21:53:50,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-26 21:53:50,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-26 21:53:50,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-26 21:53:50,638 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-26 21:53:50,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:53:50,638 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-26 21:53:50,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-26 21:53:50,638 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-26 21:53:50,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-26 21:53:50,639 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:53:50,639 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-26 21:53:50,639 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:53:50,639 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:53:50,639 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-26 21:53:50,640 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:53:50,640 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:53:50,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:53:50,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:53:50,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:53:50,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:53:51,051 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:53:51,051 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:53:51,051 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:53:51,058 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-26 21:53:51,072 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-26 21:53:51,072 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:53:51,074 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:53:51,168 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:53:51,188 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:53:51,188 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-26 21:53:51,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-26 21:53:51,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-26 21:53:51,189 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:53:51,189 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-26 21:53:52,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:53:52,350 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-26 21:53:52,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-26 21:53:52,358 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-26 21:53:52,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:53:52,358 INFO L225 Difference]: With dead ends: 41 [2018-09-26 21:53:52,358 INFO L226 Difference]: Without dead ends: 39 [2018-09-26 21:53:52,359 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:53:52,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-26 21:53:52,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-26 21:53:52,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-26 21:53:52,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-26 21:53:52,364 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-26 21:53:52,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:53:52,364 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-26 21:53:52,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-26 21:53:52,365 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-26 21:53:52,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-26 21:53:52,365 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:53:52,365 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-26 21:53:52,366 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:53:52,366 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:53:52,366 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-26 21:53:52,366 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:53:52,366 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:53:52,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:53:52,367 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:53:52,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:53:52,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:53:52,734 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:53:52,735 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:53:52,735 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:53:52,742 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-26 21:55:41,161 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-26 21:55:41,162 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-26 21:55:42,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-26 21:55:42,938 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:42,942 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-26 21:55:42,942 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-26 21:55:42,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-26 21:55:42,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-26 21:55:42,943 INFO L146 InterpolantAutomaton]: No coverage relation statistics for PredicateCoverageChecker [2018-09-26 21:55:42,943 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-09-26 21:55:44,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-26 21:55:44,227 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-26 21:55:44,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-26 21:55:44,228 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-09-26 21:55:44,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-26 21:55:44,229 INFO L225 Difference]: With dead ends: 43 [2018-09-26 21:55:44,229 INFO L226 Difference]: Without dead ends: 41 [2018-09-26 21:55:44,229 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time [2018-09-26 21:55:44,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-26 21:55:44,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-26 21:55:44,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-26 21:55:44,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-26 21:55:44,236 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-09-26 21:55:44,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-26 21:55:44,236 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-26 21:55:44,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-26 21:55:44,236 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-26 21:55:44,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-26 21:55:44,237 INFO L367 BasicCegarLoop]: Found error trace [2018-09-26 21:55:44,237 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-09-26 21:55:44,237 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-26 21:55:44,237 INFO L99 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-09-26 21:55:44,237 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-09-26 21:55:44,238 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-26 21:55:44,238 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-26 21:55:44,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:44,238 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-26 21:55:44,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-26 21:55:44,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-26 21:55:44,644 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-26 21:55:44,644 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-26 21:55:44,644 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-26 21:55:44,652 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown