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/functions1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-c372c2b [2018-10-02 12:11:48,009 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-02 12:11:48,011 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-02 12:11:48,023 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-02 12:11:48,024 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-02 12:11:48,025 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-02 12:11:48,026 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-02 12:11:48,028 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-02 12:11:48,029 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-02 12:11:48,030 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-02 12:11:48,031 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2018-10-02 12:11:48,057 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 [2018-10-02 12:11:48,072 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-02 12:11:48,073 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-02 12:11:48,074 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-02 12:11:48,074 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-02 12:11:48,075 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-02 12:11:48,075 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-02 12:11:48,075 INFO L133 SettingsManager]: * Use SBE=true [2018-10-02 12:11:48,075 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-02 12:11:48,075 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-02 12:11:48,076 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-02 12:11:48,076 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-02 12:11:48,076 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-02 12:11:48,076 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-02 12:11:48,076 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-02 12:11:48,077 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-02 12:11:48,077 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-02 12:11:48,077 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-02 12:11:48,077 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-02 12:11:48,077 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-02 12:11:48,078 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-02 12:11:48,078 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-02 12:11:48,078 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-02 12:11:48,078 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-02 12:11:48,078 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-02 12:11:48,079 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-02 12:11:48,079 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-02 12:11:48,079 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-02 12:11:48,079 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-02 12:11:48,079 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-02 12:11:48,080 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-02 12:11:48,080 INFO L133 SettingsManager]: * Use predicate trie based predicate unification=true [2018-10-02 12:11:48,123 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-02 12:11:48,135 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-02 12:11:48,139 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-02 12:11:48,141 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-02 12:11:48,141 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-02 12:11:48,142 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl [2018-10-02 12:11:48,142 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/functions1.i_3.bpl' [2018-10-02 12:11:48,193 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-02 12:11:48,196 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-02 12:11:48,197 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-02 12:11:48,197 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-02 12:11:48,197 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-02 12:11:48,217 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,229 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,236 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-02 12:11:48,237 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-02 12:11:48,237 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-02 12:11:48,238 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-02 12:11:48,248 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,249 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,249 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,250 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,253 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,254 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,255 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... [2018-10-02 12:11:48,257 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-02 12:11:48,258 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-02 12:11:48,258 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-02 12:11:48,258 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-02 12:11:48,259 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-02 12:11:48,333 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-02 12:11:48,333 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-02 12:11:48,586 INFO L340 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-02 12:11:48,587 INFO L202 PluginConnector]: Adding new model functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 12:11:48 BoogieIcfgContainer [2018-10-02 12:11:48,587 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-02 12:11:48,588 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-02 12:11:48,589 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-02 12:11:48,592 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-02 12:11:48,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 12:11:48" (1/2) ... [2018-10-02 12:11:48,593 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47f6007c and model type functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.10 12:11:48, skipping insertion in model container [2018-10-02 12:11:48,594 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "functions1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 12:11:48" (2/2) ... [2018-10-02 12:11:48,596 INFO L112 eAbstractionObserver]: Analyzing ICFG functions1.i_3.bpl [2018-10-02 12:11:48,607 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-02 12:11:48,619 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-02 12:11:48,676 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-02 12:11:48,677 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-02 12:11:48,677 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-02 12:11:48,677 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-02 12:11:48,679 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-02 12:11:48,679 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-02 12:11:48,680 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-02 12:11:48,680 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-02 12:11:48,680 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-02 12:11:48,695 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-10-02 12:11:48,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-02 12:11:48,701 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:48,702 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-02 12:11:48,703 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:48,709 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:48,710 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-10-02 12:11:48,714 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:48,715 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:48,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:48,763 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:11:48,763 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:48,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:48,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:48,884 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-02 12:11:48,885 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-02 12:11:48,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-02 12:11:48,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-02 12:11:48,902 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:48,904 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-10-02 12:11:49,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:49,059 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-10-02 12:11:49,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-02 12:11:49,061 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-10-02 12:11:49,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:49,087 INFO L225 Difference]: With dead ends: 11 [2018-10-02 12:11:49,087 INFO L226 Difference]: Without dead ends: 7 [2018-10-02 12:11:49,093 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time 0.0s impTime [2018-10-02 12:11:49,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-02 12:11:49,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-02 12:11:49,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-02 12:11:49,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-02 12:11:49,133 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-10-02 12:11:49,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:49,133 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-02 12:11:49,133 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-02 12:11:49,133 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-02 12:11:49,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-02 12:11:49,134 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:49,134 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-10-02 12:11:49,134 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:49,134 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:49,134 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-10-02 12:11:49,134 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:49,135 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:49,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:49,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:11:49,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:49,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:49,240 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:49,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:49,241 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:49,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:11:49,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:49,284 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:11:49,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:49,519 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:11:49,519 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-10-02 12:11:49,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-02 12:11:49,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-02 12:11:49,522 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:49,522 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-10-02 12:11:49,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:49,843 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-02 12:11:49,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-02 12:11:49,844 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-10-02 12:11:49,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:49,844 INFO L225 Difference]: With dead ends: 11 [2018-10-02 12:11:49,844 INFO L226 Difference]: Without dead ends: 9 [2018-10-02 12:11:49,845 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time 0.0s impTime [2018-10-02 12:11:49,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-02 12:11:49,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-02 12:11:49,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-02 12:11:49,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-02 12:11:49,849 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-02 12:11:49,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:49,850 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-02 12:11:49,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-02 12:11:49,850 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-02 12:11:49,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-02 12:11:49,851 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:49,851 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-10-02 12:11:49,851 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:49,852 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:49,852 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-10-02 12:11:49,852 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:49,852 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:49,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:49,854 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:11:49,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:49,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:50,004 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:50,004 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:50,005 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:50,017 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 12:11:50,053 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 12:11:50,053 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:11:50,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:11:50,142 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:50,163 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:11:50,163 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-02 12:11:50,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-02 12:11:50,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-02 12:11:50,164 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:50,164 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-10-02 12:11:50,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:50,501 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-02 12:11:50,502 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-02 12:11:50,503 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-10-02 12:11:50,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:50,504 INFO L225 Difference]: With dead ends: 13 [2018-10-02 12:11:50,505 INFO L226 Difference]: Without dead ends: 11 [2018-10-02 12:11:50,505 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time 0.0s impTime [2018-10-02 12:11:50,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-02 12:11:50,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-02 12:11:50,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-02 12:11:50,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-02 12:11:50,510 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-10-02 12:11:50,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:50,510 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-02 12:11:50,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-02 12:11:50,511 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-02 12:11:50,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-02 12:11:50,511 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:50,512 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-10-02 12:11:50,512 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:50,512 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:50,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-10-02 12:11:50,513 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:50,513 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:50,514 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:50,514 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:11:50,515 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:50,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:50,641 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:50,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:50,642 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:50,659 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 12:11:50,695 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-02 12:11:50,696 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:11:50,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:11:50,883 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:50,905 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:11:50,905 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-02 12:11:50,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-02 12:11:50,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-02 12:11:50,906 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:50,906 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-10-02 12:11:51,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:51,125 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-02 12:11:51,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-02 12:11:51,127 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-10-02 12:11:51,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:51,127 INFO L225 Difference]: With dead ends: 15 [2018-10-02 12:11:51,128 INFO L226 Difference]: Without dead ends: 13 [2018-10-02 12:11:51,128 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time 0.0s impTime [2018-10-02 12:11:51,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-02 12:11:51,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-02 12:11:51,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-02 12:11:51,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-02 12:11:51,131 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-02 12:11:51,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:51,132 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-02 12:11:51,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-02 12:11:51,132 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-02 12:11:51,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-02 12:11:51,133 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:51,133 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-10-02 12:11:51,133 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:51,133 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:51,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-10-02 12:11:51,134 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:51,134 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:51,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:51,135 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:11:51,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:51,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:51,283 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:51,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:51,283 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:51,294 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 12:11:51,307 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 12:11:51,308 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:11:51,310 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:11:51,688 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:51,720 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:11:51,720 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-02 12:11:51,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-02 12:11:51,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-02 12:11:51,721 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:51,721 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-10-02 12:11:52,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:52,066 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-02 12:11:52,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-02 12:11:52,068 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-10-02 12:11:52,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:52,069 INFO L225 Difference]: With dead ends: 17 [2018-10-02 12:11:52,069 INFO L226 Difference]: Without dead ends: 15 [2018-10-02 12:11:52,070 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time 0.0s impTime [2018-10-02 12:11:52,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-02 12:11:52,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-02 12:11:52,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-02 12:11:52,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-02 12:11:52,074 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-02 12:11:52,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:52,074 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-02 12:11:52,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-02 12:11:52,075 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-02 12:11:52,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-02 12:11:52,075 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:52,075 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-10-02 12:11:52,076 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:52,076 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:52,076 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-10-02 12:11:52,076 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:52,076 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:52,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:52,077 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:11:52,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:52,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:52,215 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:52,215 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:52,215 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:52,224 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 12:11:52,567 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-02 12:11:52,568 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:11:52,572 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:11:52,625 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:52,652 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:11:52,652 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-02 12:11:52,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-02 12:11:52,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-02 12:11:52,653 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:52,653 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-10-02 12:11:52,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:52,978 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-02 12:11:52,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-02 12:11:52,979 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-10-02 12:11:52,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:52,981 INFO L225 Difference]: With dead ends: 19 [2018-10-02 12:11:52,981 INFO L226 Difference]: Without dead ends: 17 [2018-10-02 12:11:52,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time 0.0s impTime [2018-10-02 12:11:52,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-02 12:11:52,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-02 12:11:52,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-02 12:11:52,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-02 12:11:52,987 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-10-02 12:11:52,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:52,987 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-02 12:11:52,987 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-02 12:11:52,987 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-02 12:11:52,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-02 12:11:52,988 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:52,988 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-10-02 12:11:52,988 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:52,989 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:52,989 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-10-02 12:11:52,989 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:52,989 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:52,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:52,990 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:11:52,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:53,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:53,188 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:53,189 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:53,189 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:53,201 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 12:11:53,233 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-02 12:11:53,233 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:11:53,236 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:11:53,296 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:53,320 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:11:53,320 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-02 12:11:53,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-02 12:11:53,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-02 12:11:53,321 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:53,321 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-02 12:11:53,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:53,682 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-02 12:11:53,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-02 12:11:53,685 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-02 12:11:53,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:53,686 INFO L225 Difference]: With dead ends: 21 [2018-10-02 12:11:53,686 INFO L226 Difference]: Without dead ends: 19 [2018-10-02 12:11:53,686 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time 0.1s impTime [2018-10-02 12:11:53,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-02 12:11:53,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-02 12:11:53,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-02 12:11:53,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-02 12:11:53,691 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-10-02 12:11:53,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:53,691 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-02 12:11:53,691 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-02 12:11:53,691 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-02 12:11:53,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-02 12:11:53,692 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:53,692 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-10-02 12:11:53,693 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:53,693 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:53,693 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-10-02 12:11:53,693 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:53,693 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:53,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:53,694 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:11:53,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:53,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:54,071 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:54,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:54,072 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:54,080 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:11:54,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:54,102 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:11:54,161 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:54,182 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:11:54,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-02 12:11:54,183 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-02 12:11:54,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-02 12:11:54,183 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:54,183 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-10-02 12:11:54,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:54,729 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-02 12:11:54,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-02 12:11:54,730 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-10-02 12:11:54,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:54,731 INFO L225 Difference]: With dead ends: 23 [2018-10-02 12:11:54,731 INFO L226 Difference]: Without dead ends: 21 [2018-10-02 12:11:54,731 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s Time 0.2s impTime [2018-10-02 12:11:54,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-02 12:11:54,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-02 12:11:54,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-02 12:11:54,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-02 12:11:54,737 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-10-02 12:11:54,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:54,738 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-02 12:11:54,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-02 12:11:54,738 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-02 12:11:54,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-02 12:11:54,739 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:54,739 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-10-02 12:11:54,739 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:54,739 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:54,739 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-10-02 12:11:54,740 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:54,740 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:54,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:54,741 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:11:54,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:54,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:54,950 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:54,951 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:54,951 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:54,961 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 12:11:54,978 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 12:11:54,979 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:11:54,981 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:11:55,070 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:55,091 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:11:55,091 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-02 12:11:55,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-02 12:11:55,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-02 12:11:55,092 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:11:55,092 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-10-02 12:11:55,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:11:55,526 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-02 12:11:55,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-02 12:11:55,531 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-10-02 12:11:55,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:11:55,532 INFO L225 Difference]: With dead ends: 25 [2018-10-02 12:11:55,532 INFO L226 Difference]: Without dead ends: 23 [2018-10-02 12:11:55,533 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time 0.0s impTime [2018-10-02 12:11:55,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-02 12:11:55,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-02 12:11:55,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-02 12:11:55,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-02 12:11:55,538 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-10-02 12:11:55,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:11:55,538 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-02 12:11:55,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-02 12:11:55,539 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-02 12:11:55,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-02 12:11:55,539 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:11:55,539 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-10-02 12:11:55,540 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:11:55,540 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:11:55,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-10-02 12:11:55,540 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:11:55,540 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:11:55,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:55,541 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:11:55,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:11:55,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:11:55,773 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:11:55,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:11:55,774 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:11:55,784 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 12:12:15,480 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-02 12:12:15,481 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:12:15,512 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:12:15,816 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:12:15,837 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:12:15,837 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-02 12:12:15,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-02 12:12:15,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-02 12:12:15,838 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:12:15,838 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-10-02 12:12:16,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:12:16,381 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-02 12:12:16,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-02 12:12:16,382 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-10-02 12:12:16,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:12:16,383 INFO L225 Difference]: With dead ends: 27 [2018-10-02 12:12:16,383 INFO L226 Difference]: Without dead ends: 25 [2018-10-02 12:12:16,383 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time 0.1s impTime [2018-10-02 12:12:16,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-02 12:12:16,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-02 12:12:16,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-02 12:12:16,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-02 12:12:16,388 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-10-02 12:12:16,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:12:16,388 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-02 12:12:16,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-02 12:12:16,388 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-02 12:12:16,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-02 12:12:16,389 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:12:16,389 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-10-02 12:12:16,389 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:12:16,389 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:12:16,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-10-02 12:12:16,390 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:12:16,390 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:12:16,390 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:12:16,391 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:12:16,391 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:12:16,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:12:16,992 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:12:16,992 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:12:16,992 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:12:17,000 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 12:12:17,023 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 12:12:17,023 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:12:17,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:12:17,448 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:12:17,480 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:12:17,481 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-02 12:12:17,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-02 12:12:17,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-02 12:12:17,481 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:12:17,482 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-10-02 12:12:18,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:12:18,482 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-02 12:12:18,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-02 12:12:18,482 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-10-02 12:12:18,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:12:18,484 INFO L225 Difference]: With dead ends: 29 [2018-10-02 12:12:18,484 INFO L226 Difference]: Without dead ends: 27 [2018-10-02 12:12:18,484 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s Time 0.3s impTime [2018-10-02 12:12:18,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-02 12:12:18,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-02 12:12:18,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-02 12:12:18,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-02 12:12:18,489 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-10-02 12:12:18,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:12:18,490 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-02 12:12:18,490 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-02 12:12:18,490 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-02 12:12:18,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-02 12:12:18,491 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:12:18,491 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-10-02 12:12:18,491 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:12:18,491 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:12:18,491 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-10-02 12:12:18,491 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:12:18,491 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:12:18,492 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:12:18,492 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:12:18,493 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:12:18,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:12:19,005 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:12:19,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:12:19,006 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:12:19,013 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 12:13:21,146 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-02 12:13:21,146 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:13:21,305 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:13:21,418 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:13:21,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:13:21,448 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-02 12:13:21,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-02 12:13:21,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-02 12:13:21,449 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:13:21,449 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-10-02 12:13:22,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:13:22,108 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-02 12:13:22,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-02 12:13:22,110 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-10-02 12:13:22,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:13:22,111 INFO L225 Difference]: With dead ends: 31 [2018-10-02 12:13:22,111 INFO L226 Difference]: Without dead ends: 29 [2018-10-02 12:13:22,111 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s Time 0.3s impTime [2018-10-02 12:13:22,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-02 12:13:22,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-02 12:13:22,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-02 12:13:22,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-02 12:13:22,116 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-10-02 12:13:22,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:13:22,116 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-02 12:13:22,116 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-02 12:13:22,116 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-02 12:13:22,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-02 12:13:22,117 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:13:22,117 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-10-02 12:13:22,117 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:13:22,117 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:13:22,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-10-02 12:13:22,117 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:13:22,117 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:13:22,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:13:22,118 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:13:22,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:13:22,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:13:22,547 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:13:22,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:13:22,547 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:13:22,555 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 12:13:42,694 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-02 12:13:42,694 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:13:42,751 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:13:43,087 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:13:43,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:13:43,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-02 12:13:43,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-02 12:13:43,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-02 12:13:43,119 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:13:43,119 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-10-02 12:13:43,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:13:43,897 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-02 12:13:43,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-02 12:13:43,898 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-10-02 12:13:43,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:13:43,899 INFO L225 Difference]: With dead ends: 33 [2018-10-02 12:13:43,899 INFO L226 Difference]: Without dead ends: 31 [2018-10-02 12:13:43,899 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s Time 0.2s impTime [2018-10-02 12:13:43,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-02 12:13:43,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-02 12:13:43,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-02 12:13:43,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-02 12:13:43,906 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-10-02 12:13:43,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:13:43,906 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-02 12:13:43,906 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-02 12:13:43,906 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-02 12:13:43,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-02 12:13:43,907 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:13:43,907 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-10-02 12:13:43,907 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:13:43,908 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:13:43,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-10-02 12:13:43,908 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:13:43,908 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:13:43,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:13:43,909 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:13:43,909 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:13:43,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:13:44,226 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:13:44,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:13:44,227 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:13:44,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:13:44,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:13:44,267 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:13:44,570 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:13:44,604 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:13:44,604 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-02 12:13:44,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-02 12:13:44,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-02 12:13:44,605 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:13:44,605 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-10-02 12:13:45,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:13:45,524 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-02 12:13:45,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-02 12:13:45,524 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-10-02 12:13:45,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:13:45,525 INFO L225 Difference]: With dead ends: 35 [2018-10-02 12:13:45,526 INFO L226 Difference]: Without dead ends: 33 [2018-10-02 12:13:45,526 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s Time 0.1s impTime [2018-10-02 12:13:45,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-02 12:13:45,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-02 12:13:45,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-02 12:13:45,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-02 12:13:45,533 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-10-02 12:13:45,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:13:45,533 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-02 12:13:45,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-02 12:13:45,534 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-02 12:13:45,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-02 12:13:45,535 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:13:45,535 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-10-02 12:13:45,535 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:13:45,535 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:13:45,535 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-10-02 12:13:45,536 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:13:45,536 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:13:45,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:13:45,537 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 12:13:45,537 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:13:45,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:13:45,892 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:13:45,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:13:45,892 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:13:45,902 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 12:13:45,936 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 12:13:45,937 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:13:45,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:13:46,141 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:13:46,162 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:13:46,162 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-02 12:13:46,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-02 12:13:46,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-02 12:13:46,163 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:13:46,163 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-10-02 12:13:47,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:13:47,295 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-02 12:13:47,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-02 12:13:47,296 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-10-02 12:13:47,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:13:47,296 INFO L225 Difference]: With dead ends: 37 [2018-10-02 12:13:47,296 INFO L226 Difference]: Without dead ends: 35 [2018-10-02 12:13:47,297 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time 0.2s impTime [2018-10-02 12:13:47,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-02 12:13:47,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-10-02 12:13:47,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-02 12:13:47,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-02 12:13:47,302 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-10-02 12:13:47,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:13:47,302 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-02 12:13:47,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-02 12:13:47,302 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-02 12:13:47,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-02 12:13:47,303 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:13:47,303 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-10-02 12:13:47,303 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:13:47,303 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:13:47,304 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-10-02 12:13:47,304 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:13:47,304 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:13:47,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:13:47,305 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:13:47,305 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:13:47,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:13:47,710 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:13:47,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:13:47,710 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:13:47,718 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 12:14:13,202 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-02 12:14:13,202 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:14:13,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:14:13,330 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:14:13,352 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:14:13,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-02 12:14:13,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-02 12:14:13,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-02 12:14:13,353 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:14:13,353 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-10-02 12:14:14,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:14:14,366 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-02 12:14:14,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-02 12:14:14,369 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-10-02 12:14:14,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:14:14,369 INFO L225 Difference]: With dead ends: 39 [2018-10-02 12:14:14,369 INFO L226 Difference]: Without dead ends: 37 [2018-10-02 12:14:14,370 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s Time 0.2s impTime [2018-10-02 12:14:14,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-02 12:14:14,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-02 12:14:14,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-02 12:14:14,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-10-02 12:14:14,375 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-10-02 12:14:14,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:14:14,376 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-10-02 12:14:14,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-02 12:14:14,376 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-10-02 12:14:14,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-02 12:14:14,376 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:14:14,377 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-10-02 12:14:14,377 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:14:14,377 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:14:14,377 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-10-02 12:14:14,377 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:14:14,377 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:14:14,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:14:14,378 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:14:14,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:14:14,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:14:15,429 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:14:15,429 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:14:15,429 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:14:15,436 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 12:14:15,465 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 12:14:15,465 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:14:15,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:14:15,539 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:14:15,560 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:14:15,560 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-02 12:14:15,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-02 12:14:15,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-02 12:14:15,561 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:14:15,561 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-10-02 12:14:16,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:14:16,691 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-02 12:14:16,698 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-02 12:14:16,699 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-10-02 12:14:16,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:14:16,699 INFO L225 Difference]: With dead ends: 41 [2018-10-02 12:14:16,700 INFO L226 Difference]: Without dead ends: 39 [2018-10-02 12:14:16,700 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s Time 0.7s impTime [2018-10-02 12:14:16,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-02 12:14:16,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-02 12:14:16,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-02 12:14:16,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-02 12:14:16,707 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-10-02 12:14:16,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:14:16,707 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-02 12:14:16,708 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-02 12:14:16,708 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-02 12:14:16,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-02 12:14:16,708 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:14:16,710 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-10-02 12:14:16,711 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:14:16,711 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:14:16,711 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-10-02 12:14:16,711 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:14:16,711 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:14:16,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:14:16,712 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:14:16,712 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:14:16,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:14:17,596 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:14:17,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:14:17,596 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:14:17,604 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 12:16:17,609 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-02 12:16:17,609 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 12:16:17,819 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 12:16:17,982 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:16:18,004 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 12:16:18,004 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-02 12:16:18,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-02 12:16:18,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-02 12:16:18,005 INFO L146 InterpolantAutomaton]: No coverage relation statistics for ImplicationMap [2018-10-02 12:16:18,006 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-10-02 12:16:19,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 12:16:19,416 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-02 12:16:19,417 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-02 12:16:19,417 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-10-02 12:16:19,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 12:16:19,418 INFO L225 Difference]: With dead ends: 43 [2018-10-02 12:16:19,418 INFO L226 Difference]: Without dead ends: 41 [2018-10-02 12:16:19,418 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s Time 0.6s impTime [2018-10-02 12:16:19,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-02 12:16:19,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-02 12:16:19,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-02 12:16:19,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-02 12:16:19,425 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-10-02 12:16:19,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 12:16:19,426 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-02 12:16:19,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-02 12:16:19,426 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-02 12:16:19,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-02 12:16:19,427 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 12:16:19,427 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-10-02 12:16:19,427 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 12:16:19,427 INFO L103 BPredicateUnifier]: Initialized predicate-trie based predicate unifier [2018-10-02 12:16:19,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-10-02 12:16:19,428 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 12:16:19,428 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 12:16:19,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:16:19,428 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 12:16:19,429 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 12:16:19,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 12:16:19,872 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-02 12:16:19,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 12:16:19,872 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-02 12:16:19,879 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown