java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -s ../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/programs/20170304-DifficultPathPrograms/simple1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-c372c2b [2018-10-02 11:49:20,106 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-02 11:49:20,108 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-02 11:49:20,124 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-02 11:49:20,125 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-02 11:49:20,126 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-02 11:49:20,127 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-02 11:49:20,128 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-02 11:49:20,130 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-02 11:49:20,131 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-02 11:49:20,132 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-02 11:49:20,132 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-02 11:49:20,133 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-02 11:49:20,134 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-02 11:49:20,135 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-02 11:49:20,136 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-02 11:49:20,137 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-02 11:49:20,139 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-02 11:49:20,141 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-02 11:49:20,142 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-02 11:49:20,143 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-02 11:49:20,145 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-02 11:49:20,147 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-02 11:49:20,156 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-10-02 11:49:20,175 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-02 11:49:20,175 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-02 11:49:20,176 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-02 11:49:20,176 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-10-02 11:49:20,177 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-10-02 11:49:20,177 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-10-02 11:49:20,177 INFO L133 SettingsManager]: * Use SBE=true [2018-10-02 11:49:20,178 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-02 11:49:20,178 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-02 11:49:20,178 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-02 11:49:20,178 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-02 11:49:20,178 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-02 11:49:20,179 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-02 11:49:20,179 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-02 11:49:20,179 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-02 11:49:20,179 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-02 11:49:20,179 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-02 11:49:20,180 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-02 11:49:20,180 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-02 11:49:20,180 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-02 11:49:20,180 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-02 11:49:20,180 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-02 11:49:20,181 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-02 11:49:20,181 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-02 11:49:20,181 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-02 11:49:20,181 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-02 11:49:20,181 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-10-02 11:49:20,182 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-02 11:49:20,182 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-02 11:49:20,182 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-02 11:49:20,224 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-02 11:49:20,239 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-02 11:49:20,246 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-02 11:49:20,248 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-10-02 11:49:20,249 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-10-02 11:49:20,250 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/simple1.i_3.bpl [2018-10-02 11:49:20,250 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/simple1.i_3.bpl' [2018-10-02 11:49:20,312 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-02 11:49:20,316 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-10-02 11:49:20,316 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-02 11:49:20,317 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-02 11:49:20,317 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-02 11:49:20,336 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,349 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,356 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-02 11:49:20,357 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-02 11:49:20,357 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-02 11:49:20,357 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-02 11:49:20,369 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,370 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,370 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,371 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,374 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,375 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,376 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/1) ... [2018-10-02 11:49:20,378 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-02 11:49:20,384 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-02 11:49:20,384 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-02 11:49:20,385 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-02 11:49:20,386 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (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 11:49:20,453 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-02 11:49:20,454 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-02 11:49:20,667 INFO L340 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-02 11:49:20,667 INFO L202 PluginConnector]: Adding new model simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 11:49:20 BoogieIcfgContainer [2018-10-02 11:49:20,667 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-02 11:49:20,669 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-02 11:49:20,669 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-02 11:49:20,672 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-02 11:49:20,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 02.10 11:49:20" (1/2) ... [2018-10-02 11:49:20,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1686ff74 and model type simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.10 11:49:20, skipping insertion in model container [2018-10-02 11:49:20,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "simple1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.10 11:49:20" (2/2) ... [2018-10-02 11:49:20,675 INFO L112 eAbstractionObserver]: Analyzing ICFG simple1.i_3.bpl [2018-10-02 11:49:20,685 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-02 11:49:20,693 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-02 11:49:20,753 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-02 11:49:20,754 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-10-02 11:49:20,754 INFO L382 AbstractCegarLoop]: Hoare is true [2018-10-02 11:49:20,754 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-02 11:49:20,754 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-02 11:49:20,754 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-02 11:49:20,755 INFO L386 AbstractCegarLoop]: Difference is false [2018-10-02 11:49:20,755 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-02 11:49:20,755 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-02 11:49:20,774 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-10-02 11:49:20,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-10-02 11:49:20,790 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:20,791 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-10-02 11:49:20,795 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:20,802 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:20,804 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-10-02 11:49:20,807 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:20,808 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:20,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:20,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:49:20,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:20,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:21,013 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 11:49:21,015 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-02 11:49:21,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-02 11:49:21,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-02 11:49:21,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-02 11:49:21,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-02 11:49:21,033 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-10-02 11:49:21,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:21,088 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-10-02 11:49:21,088 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-02 11:49:21,090 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-10-02 11:49:21,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:21,101 INFO L225 Difference]: With dead ends: 11 [2018-10-02 11:49:21,101 INFO L226 Difference]: Without dead ends: 7 [2018-10-02 11:49:21,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-02 11:49:21,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-10-02 11:49:21,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-10-02 11:49:21,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-10-02 11:49:21,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-10-02 11:49:21,137 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-10-02 11:49:21,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:21,138 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-10-02 11:49:21,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-02 11:49:21,138 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-10-02 11:49:21,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-10-02 11:49:21,139 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:21,139 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-10-02 11:49:21,139 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:21,139 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:21,140 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-10-02 11:49:21,140 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:21,140 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:21,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:21,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:49:21,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:21,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:21,329 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 11:49:21,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:21,330 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 11:49:21,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:49:21,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:21,397 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:21,432 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 11:49:21,454 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:21,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-10-02 11:49:21,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-02 11:49:21,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-02 11:49:21,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-02 11:49:21,456 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-10-02 11:49:21,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:21,507 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-10-02 11:49:21,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-02 11:49:21,508 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-10-02 11:49:21,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:21,508 INFO L225 Difference]: With dead ends: 11 [2018-10-02 11:49:21,509 INFO L226 Difference]: Without dead ends: 9 [2018-10-02 11:49:21,510 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-10-02 11:49:21,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-10-02 11:49:21,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-10-02 11:49:21,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-10-02 11:49:21,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-10-02 11:49:21,514 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-10-02 11:49:21,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:21,514 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-10-02 11:49:21,514 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-02 11:49:21,514 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-10-02 11:49:21,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-10-02 11:49:21,515 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:21,515 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-10-02 11:49:21,515 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:21,516 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:21,516 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-10-02 11:49:21,516 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:21,516 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:21,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:21,517 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:49:21,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:21,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:21,718 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 11:49:21,719 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:21,719 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 11:49:21,729 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:49:21,751 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:49:21,752 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:49:21,753 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:21,775 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 11:49:21,802 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:21,802 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-10-02 11:49:21,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-02 11:49:21,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-02 11:49:21,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-02 11:49:21,803 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-10-02 11:49:21,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:21,861 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-10-02 11:49:21,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-02 11:49:21,862 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-10-02 11:49:21,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:21,863 INFO L225 Difference]: With dead ends: 13 [2018-10-02 11:49:21,863 INFO L226 Difference]: Without dead ends: 11 [2018-10-02 11:49:21,864 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-02 11:49:21,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-10-02 11:49:21,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-10-02 11:49:21,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-10-02 11:49:21,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-10-02 11:49:21,869 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-10-02 11:49:21,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:21,869 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-10-02 11:49:21,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-02 11:49:21,870 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-10-02 11:49:21,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-02 11:49:21,870 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:21,870 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-10-02 11:49:21,871 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:21,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:21,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-10-02 11:49:21,872 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:21,872 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:21,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:21,874 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:49:21,874 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:21,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:22,286 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 11:49:22,286 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:22,286 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 11:49:22,301 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:49:22,329 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-02 11:49:22,329 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:49:22,331 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:22,349 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 11:49:22,371 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:22,372 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-10-02 11:49:22,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-02 11:49:22,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-02 11:49:22,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-02 11:49:22,373 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-10-02 11:49:22,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:22,433 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-10-02 11:49:22,435 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-02 11:49:22,435 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-10-02 11:49:22,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:22,436 INFO L225 Difference]: With dead ends: 15 [2018-10-02 11:49:22,437 INFO L226 Difference]: Without dead ends: 13 [2018-10-02 11:49:22,437 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-10-02 11:49:22,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-10-02 11:49:22,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-10-02 11:49:22,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-10-02 11:49:22,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-10-02 11:49:22,442 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-10-02 11:49:22,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:22,442 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-10-02 11:49:22,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-02 11:49:22,443 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-10-02 11:49:22,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-02 11:49:22,443 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:22,444 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-10-02 11:49:22,444 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:22,444 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:22,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-10-02 11:49:22,445 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:22,445 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:22,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:22,446 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:49:22,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:22,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:22,609 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 11:49:22,609 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:22,609 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 11:49:22,617 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:49:22,640 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:49:22,641 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:49:22,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:22,725 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 11:49:22,747 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:22,747 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-10-02 11:49:22,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-02 11:49:22,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-02 11:49:22,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-02 11:49:22,748 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-10-02 11:49:22,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:22,809 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-10-02 11:49:22,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-02 11:49:22,810 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-10-02 11:49:22,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:22,811 INFO L225 Difference]: With dead ends: 17 [2018-10-02 11:49:22,811 INFO L226 Difference]: Without dead ends: 15 [2018-10-02 11:49:22,812 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-10-02 11:49:22,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-02 11:49:22,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-02 11:49:22,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-02 11:49:22,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-10-02 11:49:22,816 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-10-02 11:49:22,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:22,817 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-10-02 11:49:22,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-02 11:49:22,817 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-10-02 11:49:22,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-02 11:49:22,818 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:22,818 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-10-02 11:49:22,818 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:22,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:22,819 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-10-02 11:49:22,819 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:22,819 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:22,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:22,820 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:49:22,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:22,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:22,992 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 11:49:22,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:22,993 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 11:49:23,004 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:49:23,058 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-02 11:49:23,059 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:49:23,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:23,093 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 11:49:23,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:23,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-10-02 11:49:23,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-02 11:49:23,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-02 11:49:23,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-02 11:49:23,122 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-10-02 11:49:23,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:23,240 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-02 11:49:23,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-02 11:49:23,242 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-10-02 11:49:23,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:23,243 INFO L225 Difference]: With dead ends: 19 [2018-10-02 11:49:23,243 INFO L226 Difference]: Without dead ends: 17 [2018-10-02 11:49:23,245 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-10-02 11:49:23,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-02 11:49:23,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-02 11:49:23,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-02 11:49:23,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-02 11:49:23,256 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-10-02 11:49:23,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:23,257 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-02 11:49:23,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-02 11:49:23,257 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-02 11:49:23,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-02 11:49:23,258 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:23,258 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-10-02 11:49:23,258 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:23,262 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:23,262 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-10-02 11:49:23,262 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:23,262 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:23,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:23,263 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:49:23,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:23,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:23,775 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 11:49:23,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:23,776 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 11:49:23,784 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:49:23,831 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-02 11:49:23,832 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:49:23,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:23,857 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 11:49:23,881 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:23,882 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-10-02 11:49:23,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-02 11:49:23,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-02 11:49:23,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-02 11:49:23,883 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-10-02 11:49:23,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:23,980 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-02 11:49:23,982 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-02 11:49:23,982 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-10-02 11:49:23,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:23,983 INFO L225 Difference]: With dead ends: 21 [2018-10-02 11:49:23,983 INFO L226 Difference]: Without dead ends: 19 [2018-10-02 11:49:23,984 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-10-02 11:49:23,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-10-02 11:49:23,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-10-02 11:49:23,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-02 11:49:23,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-02 11:49:23,990 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-10-02 11:49:23,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:23,990 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-02 11:49:23,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-02 11:49:23,990 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-02 11:49:23,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-02 11:49:23,991 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:23,991 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-10-02 11:49:23,991 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:23,992 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:23,992 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-10-02 11:49:23,992 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:23,992 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:23,993 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:23,993 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:49:23,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:24,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:24,279 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 11:49:24,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:24,280 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 11:49:24,288 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:49:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:24,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:24,329 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 11:49:24,350 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:24,350 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-10-02 11:49:24,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-02 11:49:24,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-02 11:49:24,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:49:24,351 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-10-02 11:49:24,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:24,452 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-02 11:49:24,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-02 11:49:24,453 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-10-02 11:49:24,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:24,454 INFO L225 Difference]: With dead ends: 23 [2018-10-02 11:49:24,455 INFO L226 Difference]: Without dead ends: 21 [2018-10-02 11:49:24,455 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-10-02 11:49:24,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-02 11:49:24,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-02 11:49:24,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-02 11:49:24,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-10-02 11:49:24,461 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-10-02 11:49:24,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:24,461 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-10-02 11:49:24,462 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-02 11:49:24,462 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-10-02 11:49:24,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-02 11:49:24,462 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:24,462 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-10-02 11:49:24,463 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:24,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:24,463 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-10-02 11:49:24,463 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:24,464 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:24,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:24,464 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:49:24,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:24,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:24,721 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 11:49:24,721 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:24,721 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 11:49:24,730 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:49:24,739 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:49:24,740 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:49:24,741 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:24,758 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 11:49:24,778 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:24,779 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-10-02 11:49:24,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-02 11:49:24,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-02 11:49:24,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-02 11:49:24,780 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-10-02 11:49:24,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:24,936 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-02 11:49:24,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-02 11:49:24,937 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-10-02 11:49:24,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:24,939 INFO L225 Difference]: With dead ends: 25 [2018-10-02 11:49:24,939 INFO L226 Difference]: Without dead ends: 23 [2018-10-02 11:49:24,940 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-10-02 11:49:24,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-02 11:49:24,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-10-02 11:49:24,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-10-02 11:49:24,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-10-02 11:49:24,945 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-10-02 11:49:24,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:24,946 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-10-02 11:49:24,946 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-02 11:49:24,946 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-10-02 11:49:24,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-10-02 11:49:24,947 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:24,947 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-10-02 11:49:24,947 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:24,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:24,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-10-02 11:49:24,947 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:24,948 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:24,948 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:24,948 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:49:24,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:24,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:25,246 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 11:49:25,246 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:25,247 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 11:49:25,258 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:49:25,543 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-02 11:49:25,543 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:49:25,545 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:25,568 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 11:49:25,589 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:25,590 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-10-02 11:49:25,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-02 11:49:25,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-02 11:49:25,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-02 11:49:25,591 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-10-02 11:49:25,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:25,734 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-02 11:49:25,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-02 11:49:25,735 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-10-02 11:49:25,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:25,736 INFO L225 Difference]: With dead ends: 27 [2018-10-02 11:49:25,736 INFO L226 Difference]: Without dead ends: 25 [2018-10-02 11:49:25,737 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-10-02 11:49:25,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-02 11:49:25,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-10-02 11:49:25,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-02 11:49:25,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-02 11:49:25,742 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-10-02 11:49:25,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:25,743 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-02 11:49:25,743 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-02 11:49:25,743 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-02 11:49:25,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-02 11:49:25,744 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:25,744 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-10-02 11:49:25,744 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:25,745 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:25,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-10-02 11:49:25,745 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:25,745 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:25,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:25,746 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:49:25,746 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:25,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:25,971 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 11:49:25,971 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:25,971 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 11:49:25,979 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:49:26,006 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:49:26,006 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:49:26,008 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:49:26,027 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 11:49:26,047 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:49:26,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-10-02 11:49:26,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-02 11:49:26,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-02 11:49:26,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-02 11:49:26,048 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-10-02 11:49:26,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:49:26,265 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-02 11:49:26,265 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-02 11:49:26,265 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-10-02 11:49:26,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:49:26,267 INFO L225 Difference]: With dead ends: 29 [2018-10-02 11:49:26,267 INFO L226 Difference]: Without dead ends: 27 [2018-10-02 11:49:26,268 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-10-02 11:49:26,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-02 11:49:26,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-02 11:49:26,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-02 11:49:26,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-10-02 11:49:26,274 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-10-02 11:49:26,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:49:26,274 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-10-02 11:49:26,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-02 11:49:26,275 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-10-02 11:49:26,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-02 11:49:26,275 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:49:26,276 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-10-02 11:49:26,276 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:49:26,276 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:49:26,276 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-10-02 11:49:26,276 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:49:26,276 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:49:26,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:26,277 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:49:26,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:49:26,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:49:26,782 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 11:49:26,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:49:26,783 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 11:49:26,795 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:50:48,094 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-10-02 11:50:48,095 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:50:48,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:50:48,358 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 11:50:48,386 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:50:48,387 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-10-02 11:50:48,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-02 11:50:48,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-02 11:50:48,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-02 11:50:48,388 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-10-02 11:50:48,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:50:48,533 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-02 11:50:48,535 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-02 11:50:48,535 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-10-02 11:50:48,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:50:48,536 INFO L225 Difference]: With dead ends: 31 [2018-10-02 11:50:48,536 INFO L226 Difference]: Without dead ends: 29 [2018-10-02 11:50:48,536 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-10-02 11:50:48,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-02 11:50:48,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-02 11:50:48,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-02 11:50:48,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-10-02 11:50:48,542 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-10-02 11:50:48,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:50:48,542 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-10-02 11:50:48,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-02 11:50:48,543 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-10-02 11:50:48,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-02 11:50:48,544 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:50:48,544 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-10-02 11:50:48,544 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:50:48,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:50:48,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-10-02 11:50:48,545 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:50:48,545 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:50:48,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:50:48,546 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:50:48,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:50:48,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:50:48,906 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 11:50:48,906 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:50:48,907 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 11:50:48,915 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-02 11:50:57,952 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-10-02 11:50:57,953 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:50:57,961 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:50:57,996 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 11:50:58,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:50:58,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-10-02 11:50:58,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-02 11:50:58,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-02 11:50:58,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:50:58,028 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-10-02 11:50:58,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:50:58,389 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-02 11:50:58,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-02 11:50:58,390 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-10-02 11:50:58,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:50:58,391 INFO L225 Difference]: With dead ends: 33 [2018-10-02 11:50:58,391 INFO L226 Difference]: Without dead ends: 31 [2018-10-02 11:50:58,392 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-10-02 11:50:58,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-10-02 11:50:58,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-10-02 11:50:58,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-02 11:50:58,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-02 11:50:58,397 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-10-02 11:50:58,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:50:58,398 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-02 11:50:58,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-02 11:50:58,398 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-02 11:50:58,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-02 11:50:58,399 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:50:58,399 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-10-02 11:50:58,399 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:50:58,399 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:50:58,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-10-02 11:50:58,400 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:50:58,400 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:50:58,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:50:58,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:50:58,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:50:58,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:50:59,041 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 11:50:59,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:50:59,041 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 11:50:59,049 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:50:59,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:50:59,062 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:50:59,080 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 11:50:59,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:50:59,100 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-10-02 11:50:59,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-02 11:50:59,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-02 11:50:59,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-02 11:50:59,101 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-10-02 11:50:59,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:50:59,352 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-02 11:50:59,353 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-02 11:50:59,353 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-10-02 11:50:59,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:50:59,354 INFO L225 Difference]: With dead ends: 35 [2018-10-02 11:50:59,354 INFO L226 Difference]: Without dead ends: 33 [2018-10-02 11:50:59,355 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-10-02 11:50:59,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-02 11:50:59,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-10-02 11:50:59,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-10-02 11:50:59,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-10-02 11:50:59,362 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-10-02 11:50:59,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:50:59,363 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-10-02 11:50:59,363 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-02 11:50:59,363 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-10-02 11:50:59,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-02 11:50:59,364 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:50:59,364 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-10-02 11:50:59,364 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:50:59,365 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:50:59,365 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-10-02 11:50:59,365 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:50:59,365 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:50:59,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:50:59,366 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-02 11:50:59,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:50:59,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:50:59,697 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 11:50:59,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:50:59,697 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 11:50:59,706 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-02 11:50:59,735 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-02 11:50:59,736 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:50:59,738 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:50:59,776 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 11:50:59,797 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:50:59,797 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-10-02 11:50:59,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-02 11:50:59,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-02 11:50:59,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-02 11:50:59,799 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-10-02 11:51:00,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:51:00,155 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-02 11:51:00,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-02 11:51:00,155 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-10-02 11:51:00,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:51:00,157 INFO L225 Difference]: With dead ends: 37 [2018-10-02 11:51:00,157 INFO L226 Difference]: Without dead ends: 35 [2018-10-02 11:51:00,158 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-10-02 11:51:00,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-02 11:51:00,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-10-02 11:51:00,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-10-02 11:51:00,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-10-02 11:51:00,164 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-10-02 11:51:00,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:51:00,165 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-10-02 11:51:00,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-02 11:51:00,165 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-10-02 11:51:00,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-02 11:51:00,166 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:51:00,166 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-10-02 11:51:00,166 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:51:00,167 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:51:00,167 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-10-02 11:51:00,167 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:51:00,167 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:51:00,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:51:00,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:51:00,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:51:00,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:51:00,558 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 11:51:00,558 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:51:00,558 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 11:51:00,566 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-02 11:51:44,886 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-02 11:51:44,887 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:51:44,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:51:44,995 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 11:51:45,017 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:51:45,017 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-10-02 11:51:45,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-02 11:51:45,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-02 11:51:45,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-02 11:51:45,018 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-10-02 11:51:45,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:51:45,371 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-02 11:51:45,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-02 11:51:45,373 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-10-02 11:51:45,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:51:45,374 INFO L225 Difference]: With dead ends: 39 [2018-10-02 11:51:45,374 INFO L226 Difference]: Without dead ends: 37 [2018-10-02 11:51:45,374 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-10-02 11:51:45,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-02 11:51:45,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-02 11:51:45,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-02 11:51:45,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-10-02 11:51:45,379 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-10-02 11:51:45,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:51:45,379 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-10-02 11:51:45,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-02 11:51:45,379 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-10-02 11:51:45,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-02 11:51:45,380 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:51:45,380 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-10-02 11:51:45,381 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:51:45,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:51:45,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-10-02 11:51:45,381 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:51:45,381 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:51:45,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:51:45,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:51:45,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:51:45,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:51:45,746 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 11:51:45,746 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:51:45,746 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 11:51:45,753 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-02 11:51:45,778 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-02 11:51:45,779 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:51:45,781 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:51:45,852 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 11:51:45,883 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:51:45,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-10-02 11:51:45,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-02 11:51:45,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-02 11:51:45,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-02 11:51:45,884 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-10-02 11:51:46,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:51:46,138 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-02 11:51:46,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-02 11:51:46,139 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-10-02 11:51:46,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:51:46,140 INFO L225 Difference]: With dead ends: 41 [2018-10-02 11:51:46,140 INFO L226 Difference]: Without dead ends: 39 [2018-10-02 11:51:46,141 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-10-02 11:51:46,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-02 11:51:46,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-02 11:51:46,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-02 11:51:46,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-10-02 11:51:46,146 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-10-02 11:51:46,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:51:46,147 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-10-02 11:51:46,147 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-02 11:51:46,147 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-10-02 11:51:46,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-10-02 11:51:46,147 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:51:46,148 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-10-02 11:51:46,148 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:51:46,148 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:51:46,148 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-10-02 11:51:46,148 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:51:46,148 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:51:46,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:51:46,149 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:51:46,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:51:46,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:51:46,465 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 11:51:46,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:51:46,465 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 11:51:46,474 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-02 11:53:59,687 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-10-02 11:53:59,687 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-02 11:53:59,795 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-02 11:53:59,822 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 11:53:59,843 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-10-02 11:53:59,843 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-10-02 11:53:59,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-02 11:53:59,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-02 11:53:59,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-02 11:53:59,844 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-10-02 11:54:00,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-02 11:54:00,168 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-02 11:54:00,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-02 11:54:00,168 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-10-02 11:54:00,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-02 11:54:00,169 INFO L225 Difference]: With dead ends: 43 [2018-10-02 11:54:00,169 INFO L226 Difference]: Without dead ends: 41 [2018-10-02 11:54:00,170 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-10-02 11:54:00,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-10-02 11:54:00,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-10-02 11:54:00,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-10-02 11:54:00,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-10-02 11:54:00,177 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-10-02 11:54:00,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-02 11:54:00,177 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-10-02 11:54:00,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-02 11:54:00,177 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-10-02 11:54:00,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-10-02 11:54:00,178 INFO L367 BasicCegarLoop]: Found error trace [2018-10-02 11:54:00,178 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-10-02 11:54:00,178 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-10-02 11:54:00,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-02 11:54:00,179 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-10-02 11:54:00,179 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-10-02 11:54:00,179 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-10-02 11:54:00,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:00,180 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-02 11:54:00,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-02 11:54:00,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-02 11:54:00,529 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 11:54:00,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-02 11:54:00,529 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 11:54:00,543 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown