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/diamond1.i_3.bpl -------------------------------------------------------------------------------- This is Ultimate 0.1.23-bd42740 [2018-09-23 21:25:43,162 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-23 21:25:43,164 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-23 21:25:43,176 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-23 21:25:43,176 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-23 21:25:43,177 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-23 21:25:43,179 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-23 21:25:43,180 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-23 21:25:43,183 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-23 21:25:43,191 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-23 21:25:43,192 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-23 21:25:43,192 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-23 21:25:43,193 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-23 21:25:43,194 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-23 21:25:43,196 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-23 21:25:43,196 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-23 21:25:43,197 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-23 21:25:43,199 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-23 21:25:43,201 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-23 21:25:43,202 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-23 21:25:43,203 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-23 21:25:43,205 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-23 21:25:43,207 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-09-23 21:25:43,215 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/pu-bench/svcomp-Reach-32bit-Automizer_Default.epf [2018-09-23 21:25:43,241 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-23 21:25:43,241 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-23 21:25:43,242 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-23 21:25:43,242 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-09-23 21:25:43,243 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-09-23 21:25:43,243 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-09-23 21:25:43,243 INFO L133 SettingsManager]: * Use SBE=true [2018-09-23 21:25:43,243 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-23 21:25:43,244 INFO L133 SettingsManager]: * sizeof long=4 [2018-09-23 21:25:43,244 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-23 21:25:43,244 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-09-23 21:25:43,244 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-23 21:25:43,244 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-23 21:25:43,245 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-23 21:25:43,245 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-23 21:25:43,245 INFO L133 SettingsManager]: * sizeof long double=12 [2018-09-23 21:25:43,245 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-23 21:25:43,245 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-23 21:25:43,246 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-23 21:25:43,246 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-23 21:25:43,246 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-23 21:25:43,246 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-23 21:25:43,246 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 21:25:43,247 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-23 21:25:43,247 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-23 21:25:43,247 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-23 21:25:43,247 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-09-23 21:25:43,247 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-23 21:25:43,248 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-23 21:25:43,248 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-23 21:25:43,296 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-23 21:25:43,308 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-23 21:25:43,312 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-23 21:25:43,314 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2018-09-23 21:25:43,315 INFO L276 PluginConnector]: Boogie PL CUP Parser initialized [2018-09-23 21:25:43,315 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl [2018-09-23 21:25:43,316 INFO L111 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/programs/20170304-DifficultPathPrograms/diamond1.i_3.bpl' [2018-09-23 21:25:43,368 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-23 21:25:43,371 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-09-23 21:25:43,372 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-23 21:25:43,373 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-23 21:25:43,373 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-23 21:25:43,394 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,407 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,414 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-23 21:25:43,415 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-23 21:25:43,415 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-23 21:25:43,415 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-23 21:25:43,427 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,428 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,429 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,429 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,433 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,436 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,437 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... [2018-09-23 21:25:43,440 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-23 21:25:43,445 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-23 21:25:43,445 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-23 21:25:43,445 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-23 21:25:43,447 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-23 21:25:43,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-23 21:25:43,528 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-23 21:25:43,729 INFO L354 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-23 21:25:43,730 INFO L202 PluginConnector]: Adding new model diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 09:25:43 BoogieIcfgContainer [2018-09-23 21:25:43,730 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-23 21:25:43,731 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-23 21:25:43,731 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-23 21:25:43,734 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-23 21:25:43,735 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 23.09 09:25:43" (1/2) ... [2018-09-23 21:25:43,739 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13867da8 and model type diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.09 09:25:43, skipping insertion in model container [2018-09-23 21:25:43,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "diamond1.i_3.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.09 09:25:43" (2/2) ... [2018-09-23 21:25:43,743 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond1.i_3.bpl [2018-09-23 21:25:43,753 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-23 21:25:43,764 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-23 21:25:43,822 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-09-23 21:25:43,823 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-23 21:25:43,823 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-23 21:25:43,823 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-23 21:25:43,823 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-23 21:25:43,823 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-23 21:25:43,824 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-23 21:25:43,824 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-23 21:25:43,824 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-23 21:25:43,843 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2018-09-23 21:25:43,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2018-09-23 21:25:43,860 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:43,861 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2018-09-23 21:25:43,865 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:43,872 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:43,872 INFO L82 PathProgramCache]: Analyzing trace with hash 925639, now seen corresponding path program 1 times [2018-09-23 21:25:43,875 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:43,876 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:43,928 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:43,929 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:25:43,929 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:43,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:44,070 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:44,073 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-23 21:25:44,073 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-23 21:25:44,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-23 21:25:44,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-23 21:25:44,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 21:25:44,092 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2018-09-23 21:25:44,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:44,147 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2018-09-23 21:25:44,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-23 21:25:44,149 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2018-09-23 21:25:44,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:44,166 INFO L225 Difference]: With dead ends: 11 [2018-09-23 21:25:44,166 INFO L226 Difference]: Without dead ends: 7 [2018-09-23 21:25:44,175 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-23 21:25:44,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7 states. [2018-09-23 21:25:44,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7 to 7. [2018-09-23 21:25:44,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2018-09-23 21:25:44,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 7 transitions. [2018-09-23 21:25:44,257 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 7 transitions. Word has length 4 [2018-09-23 21:25:44,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:44,258 INFO L480 AbstractCegarLoop]: Abstraction has 7 states and 7 transitions. [2018-09-23 21:25:44,258 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-23 21:25:44,258 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 7 transitions. [2018-09-23 21:25:44,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2018-09-23 21:25:44,258 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:44,259 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2018-09-23 21:25:44,259 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:44,259 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:44,263 INFO L82 PathProgramCache]: Analyzing trace with hash 889591169, now seen corresponding path program 1 times [2018-09-23 21:25:44,263 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:44,263 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:44,264 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:44,264 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:25:44,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:44,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:44,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:44,420 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:44,421 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:44,435 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:25:44,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:44,461 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:44,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:44,525 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:44,526 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2018-09-23 21:25:44,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-23 21:25:44,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-23 21:25:44,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-23 21:25:44,527 INFO L87 Difference]: Start difference. First operand 7 states and 7 transitions. Second operand 4 states. [2018-09-23 21:25:44,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:44,564 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2018-09-23 21:25:44,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-23 21:25:44,565 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 6 [2018-09-23 21:25:44,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:44,566 INFO L225 Difference]: With dead ends: 11 [2018-09-23 21:25:44,566 INFO L226 Difference]: Without dead ends: 9 [2018-09-23 21:25:44,567 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-09-23 21:25:44,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2018-09-23 21:25:44,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-09-23 21:25:44,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2018-09-23 21:25:44,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-09-23 21:25:44,572 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 6 [2018-09-23 21:25:44,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:44,572 INFO L480 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2018-09-23 21:25:44,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-23 21:25:44,573 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2018-09-23 21:25:44,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2018-09-23 21:25:44,574 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:44,574 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1] [2018-09-23 21:25:44,574 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:44,574 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:44,574 INFO L82 PathProgramCache]: Analyzing trace with hash 198673595, now seen corresponding path program 2 times [2018-09-23 21:25:44,575 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:44,575 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:44,576 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:44,576 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:25:44,577 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:44,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:44,737 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:44,738 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:44,738 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:44,750 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:25:44,764 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:25:44,764 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:44,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:44,796 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:44,816 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:44,817 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2018-09-23 21:25:44,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-23 21:25:44,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-23 21:25:44,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-23 21:25:44,818 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-09-23 21:25:44,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:44,921 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2018-09-23 21:25:44,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-23 21:25:44,922 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 8 [2018-09-23 21:25:44,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:44,922 INFO L225 Difference]: With dead ends: 13 [2018-09-23 21:25:44,923 INFO L226 Difference]: Without dead ends: 11 [2018-09-23 21:25:44,923 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-09-23 21:25:44,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2018-09-23 21:25:44,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-09-23 21:25:44,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2018-09-23 21:25:44,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-09-23 21:25:44,928 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2018-09-23 21:25:44,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:44,928 INFO L480 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2018-09-23 21:25:44,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-23 21:25:44,928 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2018-09-23 21:25:44,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-23 21:25:44,929 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:44,929 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1] [2018-09-23 21:25:44,930 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:44,930 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:44,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1946815861, now seen corresponding path program 3 times [2018-09-23 21:25:44,930 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:44,930 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:44,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:44,932 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:44,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:44,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:45,297 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:45,297 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:45,298 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:45,313 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:25:45,330 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-23 21:25:45,330 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:45,332 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:45,369 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:45,391 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:45,391 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2018-09-23 21:25:45,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-23 21:25:45,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-23 21:25:45,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2018-09-23 21:25:45,393 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 6 states. [2018-09-23 21:25:45,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:45,449 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2018-09-23 21:25:45,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-23 21:25:45,450 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 10 [2018-09-23 21:25:45,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:45,451 INFO L225 Difference]: With dead ends: 15 [2018-09-23 21:25:45,451 INFO L226 Difference]: Without dead ends: 13 [2018-09-23 21:25:45,452 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 [2018-09-23 21:25:45,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-23 21:25:45,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-23 21:25:45,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-23 21:25:45,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2018-09-23 21:25:45,456 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 10 [2018-09-23 21:25:45,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:45,457 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2018-09-23 21:25:45,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-23 21:25:45,457 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2018-09-23 21:25:45,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-09-23 21:25:45,458 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:45,458 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2018-09-23 21:25:45,458 INFO L423 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:45,459 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:45,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1715646545, now seen corresponding path program 4 times [2018-09-23 21:25:45,459 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:45,459 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:45,460 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:45,461 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:45,461 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:45,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:45,622 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:45,623 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:45,623 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:45,633 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:25:45,670 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:25:45,671 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:45,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:45,741 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:45,761 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:45,762 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2018-09-23 21:25:45,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-23 21:25:45,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-23 21:25:45,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-23 21:25:45,764 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 7 states. [2018-09-23 21:25:45,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:45,908 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2018-09-23 21:25:45,908 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-23 21:25:45,909 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-09-23 21:25:45,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:45,910 INFO L225 Difference]: With dead ends: 17 [2018-09-23 21:25:45,910 INFO L226 Difference]: Without dead ends: 15 [2018-09-23 21:25:45,910 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2018-09-23 21:25:45,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-09-23 21:25:45,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-09-23 21:25:45,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-23 21:25:45,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2018-09-23 21:25:45,915 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2018-09-23 21:25:45,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:45,915 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2018-09-23 21:25:45,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-23 21:25:45,915 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2018-09-23 21:25:45,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-23 21:25:45,916 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:45,916 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1] [2018-09-23 21:25:45,916 INFO L423 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:45,917 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:45,917 INFO L82 PathProgramCache]: Analyzing trace with hash 531164009, now seen corresponding path program 5 times [2018-09-23 21:25:45,917 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:45,917 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:45,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:45,918 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:45,918 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:45,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:46,408 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:46,408 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:46,408 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:46,421 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:25:46,469 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-23 21:25:46,470 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:46,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:46,489 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:46,516 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:46,517 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2018-09-23 21:25:46,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-23 21:25:46,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-23 21:25:46,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-23 21:25:46,518 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2018-09-23 21:25:46,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:46,688 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-23 21:25:46,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-23 21:25:46,689 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2018-09-23 21:25:46,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:46,690 INFO L225 Difference]: With dead ends: 19 [2018-09-23 21:25:46,691 INFO L226 Difference]: Without dead ends: 17 [2018-09-23 21:25:46,691 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-09-23 21:25:46,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-09-23 21:25:46,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-09-23 21:25:46,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-09-23 21:25:46,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-09-23 21:25:46,696 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2018-09-23 21:25:46,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:46,697 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-09-23 21:25:46,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-23 21:25:46,697 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-09-23 21:25:46,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-09-23 21:25:46,698 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:46,698 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1] [2018-09-23 21:25:46,698 INFO L423 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:46,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:46,699 INFO L82 PathProgramCache]: Analyzing trace with hash -652443485, now seen corresponding path program 6 times [2018-09-23 21:25:46,699 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:46,699 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:46,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:46,700 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:46,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:46,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:47,083 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:47,084 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:47,084 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:47,111 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:25:47,224 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-23 21:25:47,225 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:47,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:47,310 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:47,342 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:47,342 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2018-09-23 21:25:47,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-23 21:25:47,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-23 21:25:47,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-23 21:25:47,343 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2018-09-23 21:25:47,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:47,463 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-23 21:25:47,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-23 21:25:47,466 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2018-09-23 21:25:47,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:47,467 INFO L225 Difference]: With dead ends: 21 [2018-09-23 21:25:47,467 INFO L226 Difference]: Without dead ends: 19 [2018-09-23 21:25:47,468 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2018-09-23 21:25:47,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-23 21:25:47,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-23 21:25:47,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-23 21:25:47,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-09-23 21:25:47,473 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2018-09-23 21:25:47,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:47,473 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-09-23 21:25:47,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-23 21:25:47,474 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-09-23 21:25:47,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-09-23 21:25:47,474 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:47,474 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1] [2018-09-23 21:25:47,475 INFO L423 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:47,475 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:47,475 INFO L82 PathProgramCache]: Analyzing trace with hash 67088221, now seen corresponding path program 7 times [2018-09-23 21:25:47,475 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:47,475 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:47,476 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:47,476 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:47,477 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:47,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:47,799 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:47,800 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:47,800 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:47,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:25:47,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:47,830 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:47,839 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:47,859 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:47,859 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2018-09-23 21:25:47,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-23 21:25:47,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-23 21:25:47,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2018-09-23 21:25:47,861 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 10 states. [2018-09-23 21:25:47,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:47,953 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-23 21:25:47,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-23 21:25:47,954 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2018-09-23 21:25:47,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:47,955 INFO L225 Difference]: With dead ends: 23 [2018-09-23 21:25:47,955 INFO L226 Difference]: Without dead ends: 21 [2018-09-23 21:25:47,956 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 [2018-09-23 21:25:47,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-23 21:25:47,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-09-23 21:25:47,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-23 21:25:47,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-09-23 21:25:47,962 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2018-09-23 21:25:47,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:47,962 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-09-23 21:25:47,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-23 21:25:47,962 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-09-23 21:25:47,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-23 21:25:47,963 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:47,963 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1] [2018-09-23 21:25:47,963 INFO L423 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:47,964 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:47,964 INFO L82 PathProgramCache]: Analyzing trace with hash 47323031, now seen corresponding path program 8 times [2018-09-23 21:25:47,964 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:47,964 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:47,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:47,965 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:25:47,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:47,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:48,225 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:48,226 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:48,226 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:48,234 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:25:48,249 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:25:48,249 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:48,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:48,266 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:48,288 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:48,289 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2018-09-23 21:25:48,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-23 21:25:48,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-23 21:25:48,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2018-09-23 21:25:48,290 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 11 states. [2018-09-23 21:25:48,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:48,453 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-23 21:25:48,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-23 21:25:48,454 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 20 [2018-09-23 21:25:48,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:48,455 INFO L225 Difference]: With dead ends: 25 [2018-09-23 21:25:48,455 INFO L226 Difference]: Without dead ends: 23 [2018-09-23 21:25:48,456 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 [2018-09-23 21:25:48,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-09-23 21:25:48,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-09-23 21:25:48,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-09-23 21:25:48,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-09-23 21:25:48,461 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2018-09-23 21:25:48,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:48,461 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-09-23 21:25:48,461 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-23 21:25:48,462 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-09-23 21:25:48,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-09-23 21:25:48,462 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:48,463 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1] [2018-09-23 21:25:48,463 INFO L423 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:48,463 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:48,463 INFO L82 PathProgramCache]: Analyzing trace with hash -1767155375, now seen corresponding path program 9 times [2018-09-23 21:25:48,463 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:48,464 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:48,464 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:48,464 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:48,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:48,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:48,748 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:48,748 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:48,749 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:48,760 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:25:49,637 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-23 21:25:49,637 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:49,640 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:49,669 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:49,690 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:49,690 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2018-09-23 21:25:49,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-23 21:25:49,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-23 21:25:49,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2018-09-23 21:25:49,692 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2018-09-23 21:25:49,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:49,823 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-23 21:25:49,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-23 21:25:49,823 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2018-09-23 21:25:49,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:49,824 INFO L225 Difference]: With dead ends: 27 [2018-09-23 21:25:49,824 INFO L226 Difference]: Without dead ends: 25 [2018-09-23 21:25:49,825 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 [2018-09-23 21:25:49,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-09-23 21:25:49,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-09-23 21:25:49,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-09-23 21:25:49,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-09-23 21:25:49,831 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2018-09-23 21:25:49,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:49,831 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-09-23 21:25:49,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-23 21:25:49,832 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-09-23 21:25:49,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-09-23 21:25:49,832 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:49,833 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1] [2018-09-23 21:25:49,833 INFO L423 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:49,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:49,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1724181365, now seen corresponding path program 10 times [2018-09-23 21:25:49,833 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:49,834 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:49,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:49,835 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:49,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:49,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:50,071 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:50,071 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:50,071 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:50,079 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:25:50,106 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:25:50,107 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:50,109 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:50,181 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:50,214 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:50,214 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2018-09-23 21:25:50,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-23 21:25:50,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-23 21:25:50,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-23 21:25:50,215 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 13 states. [2018-09-23 21:25:50,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:50,598 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-23 21:25:50,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-23 21:25:50,598 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 24 [2018-09-23 21:25:50,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:50,600 INFO L225 Difference]: With dead ends: 29 [2018-09-23 21:25:50,600 INFO L226 Difference]: Without dead ends: 27 [2018-09-23 21:25:50,601 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2018-09-23 21:25:50,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-23 21:25:50,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-09-23 21:25:50,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-23 21:25:50,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-23 21:25:50,607 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2018-09-23 21:25:50,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:50,607 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-23 21:25:50,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-23 21:25:50,607 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-23 21:25:50,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-23 21:25:50,608 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:50,608 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1] [2018-09-23 21:25:50,608 INFO L423 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:50,608 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:50,609 INFO L82 PathProgramCache]: Analyzing trace with hash 919136581, now seen corresponding path program 11 times [2018-09-23 21:25:50,609 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:50,609 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:50,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:50,610 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:50,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:50,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:51,279 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:51,279 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:51,279 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:51,291 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:25:51,434 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-23 21:25:51,434 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:51,437 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:51,464 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:51,492 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:51,492 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 13 [2018-09-23 21:25:51,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-23 21:25:51,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-23 21:25:51,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-23 21:25:51,493 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 14 states. [2018-09-23 21:25:51,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:51,697 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-23 21:25:51,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-23 21:25:51,699 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 26 [2018-09-23 21:25:51,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:51,700 INFO L225 Difference]: With dead ends: 31 [2018-09-23 21:25:51,700 INFO L226 Difference]: Without dead ends: 29 [2018-09-23 21:25:51,701 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2018-09-23 21:25:51,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-09-23 21:25:51,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-09-23 21:25:51,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-23 21:25:51,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-09-23 21:25:51,707 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2018-09-23 21:25:51,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:51,707 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-09-23 21:25:51,707 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-23 21:25:51,708 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-09-23 21:25:51,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-23 21:25:51,708 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:51,708 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1] [2018-09-23 21:25:51,709 INFO L423 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:51,709 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:51,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1472956545, now seen corresponding path program 12 times [2018-09-23 21:25:51,709 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:51,709 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:51,710 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:51,710 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:51,711 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:51,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:52,064 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:52,064 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:52,064 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:52,073 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:25:53,135 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-23 21:25:53,135 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:53,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:53,166 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:53,188 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:53,189 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2018-09-23 21:25:53,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-23 21:25:53,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-23 21:25:53,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2018-09-23 21:25:53,190 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-09-23 21:25:53,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:53,555 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-23 21:25:53,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-23 21:25:53,556 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-09-23 21:25:53,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:53,557 INFO L225 Difference]: With dead ends: 33 [2018-09-23 21:25:53,557 INFO L226 Difference]: Without dead ends: 31 [2018-09-23 21:25:53,559 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 [2018-09-23 21:25:53,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-23 21:25:53,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-09-23 21:25:53,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-23 21:25:53,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-09-23 21:25:53,564 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2018-09-23 21:25:53,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:53,565 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-09-23 21:25:53,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-23 21:25:53,565 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-09-23 21:25:53,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-09-23 21:25:53,566 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:53,566 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1] [2018-09-23 21:25:53,566 INFO L423 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:53,566 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:53,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1828020025, now seen corresponding path program 13 times [2018-09-23 21:25:53,567 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:53,567 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:53,567 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:53,568 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:53,568 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:53,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:54,250 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:54,251 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:54,251 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:54,259 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:25:54,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:54,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:54,302 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:54,323 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:54,323 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2018-09-23 21:25:54,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-23 21:25:54,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-23 21:25:54,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2018-09-23 21:25:54,325 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 16 states. [2018-09-23 21:25:54,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:54,532 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-23 21:25:54,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-23 21:25:54,533 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 30 [2018-09-23 21:25:54,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:54,534 INFO L225 Difference]: With dead ends: 35 [2018-09-23 21:25:54,534 INFO L226 Difference]: Without dead ends: 33 [2018-09-23 21:25:54,535 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 [2018-09-23 21:25:54,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-23 21:25:54,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-09-23 21:25:54,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-23 21:25:54,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-23 21:25:54,542 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2018-09-23 21:25:54,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:54,542 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-23 21:25:54,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-23 21:25:54,543 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-23 21:25:54,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-23 21:25:54,544 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:54,544 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1] [2018-09-23 21:25:54,544 INFO L423 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:54,544 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:54,545 INFO L82 PathProgramCache]: Analyzing trace with hash 85672051, now seen corresponding path program 14 times [2018-09-23 21:25:54,545 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:54,545 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:54,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:54,546 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:25:54,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:54,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:54,985 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:54,985 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:54,986 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:54,995 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:25:55,011 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:25:55,011 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:55,013 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:55,041 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:55,071 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:55,071 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2018-09-23 21:25:55,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-23 21:25:55,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-23 21:25:55,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-23 21:25:55,072 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 17 states. [2018-09-23 21:25:55,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:55,318 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-23 21:25:55,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-23 21:25:55,319 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2018-09-23 21:25:55,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:55,320 INFO L225 Difference]: With dead ends: 37 [2018-09-23 21:25:55,321 INFO L226 Difference]: Without dead ends: 35 [2018-09-23 21:25:55,322 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2018-09-23 21:25:55,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-09-23 21:25:55,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-09-23 21:25:55,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-09-23 21:25:55,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-09-23 21:25:55,331 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2018-09-23 21:25:55,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:55,331 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-09-23 21:25:55,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-23 21:25:55,331 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-09-23 21:25:55,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-09-23 21:25:55,332 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:55,332 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1] [2018-09-23 21:25:55,335 INFO L423 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:55,336 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:55,336 INFO L82 PathProgramCache]: Analyzing trace with hash 726514477, now seen corresponding path program 15 times [2018-09-23 21:25:55,336 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:55,336 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:55,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:55,337 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:55,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:55,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:55,621 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:55,621 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:55,621 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:55,628 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:25:56,867 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-23 21:25:56,867 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:56,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:56,927 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:56,947 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:56,947 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 17 [2018-09-23 21:25:56,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-23 21:25:56,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-23 21:25:56,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-23 21:25:56,948 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 18 states. [2018-09-23 21:25:57,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:57,166 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-23 21:25:57,169 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-23 21:25:57,169 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2018-09-23 21:25:57,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:57,170 INFO L225 Difference]: With dead ends: 39 [2018-09-23 21:25:57,170 INFO L226 Difference]: Without dead ends: 37 [2018-09-23 21:25:57,170 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2018-09-23 21:25:57,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-23 21:25:57,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-09-23 21:25:57,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-09-23 21:25:57,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-09-23 21:25:57,175 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2018-09-23 21:25:57,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:57,176 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-09-23 21:25:57,176 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-23 21:25:57,176 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-09-23 21:25:57,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-09-23 21:25:57,177 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:57,177 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1] [2018-09-23 21:25:57,177 INFO L423 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:57,177 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:57,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1899204761, now seen corresponding path program 16 times [2018-09-23 21:25:57,177 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:57,178 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:57,178 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:57,178 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:57,179 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:57,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:57,554 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:57,554 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:57,554 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:57,561 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:25:57,597 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:25:57,597 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:25:57,599 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:25:57,609 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:57,631 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:25:57,632 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2018-09-23 21:25:57,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-23 21:25:57,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-23 21:25:57,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2018-09-23 21:25:57,633 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 19 states. [2018-09-23 21:25:57,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:25:57,921 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-23 21:25:57,925 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-23 21:25:57,925 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 36 [2018-09-23 21:25:57,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:25:57,925 INFO L225 Difference]: With dead ends: 41 [2018-09-23 21:25:57,926 INFO L226 Difference]: Without dead ends: 39 [2018-09-23 21:25:57,926 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 [2018-09-23 21:25:57,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-09-23 21:25:57,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-09-23 21:25:57,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-23 21:25:57,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-23 21:25:57,932 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2018-09-23 21:25:57,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:25:57,932 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-23 21:25:57,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-23 21:25:57,932 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-23 21:25:57,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-23 21:25:57,933 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:25:57,933 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1] [2018-09-23 21:25:57,934 INFO L423 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:25:57,934 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:25:57,934 INFO L82 PathProgramCache]: Analyzing trace with hash 225377569, now seen corresponding path program 17 times [2018-09-23 21:25:57,934 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:25:57,934 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:25:57,935 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:57,935 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:25:57,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:25:57,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:25:58,266 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:25:58,266 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:25:58,266 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:25:58,274 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:26:28,100 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-23 21:26:28,100 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:28,242 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:28,260 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:28,281 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:28,281 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 19 [2018-09-23 21:26:28,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-23 21:26:28,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-23 21:26:28,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2018-09-23 21:26:28,283 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 20 states. [2018-09-23 21:26:28,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:28,571 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-23 21:26:28,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-23 21:26:28,573 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2018-09-23 21:26:28,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:28,574 INFO L225 Difference]: With dead ends: 43 [2018-09-23 21:26:28,574 INFO L226 Difference]: Without dead ends: 41 [2018-09-23 21:26:28,574 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 [2018-09-23 21:26:28,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-09-23 21:26:28,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-09-23 21:26:28,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-09-23 21:26:28,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-09-23 21:26:28,583 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2018-09-23 21:26:28,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:28,583 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-09-23 21:26:28,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-23 21:26:28,583 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-09-23 21:26:28,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-09-23 21:26:28,584 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:28,584 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1] [2018-09-23 21:26:28,585 INFO L423 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:28,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:28,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1839531099, now seen corresponding path program 18 times [2018-09-23 21:26:28,585 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:28,585 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:28,590 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:28,590 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:28,591 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:28,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:29,310 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:29,310 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:29,311 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:29,320 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:26:30,419 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-23 21:26:30,420 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:30,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:30,464 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:30,484 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:30,484 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2018-09-23 21:26:30,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-23 21:26:30,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-23 21:26:30,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-23 21:26:30,486 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 21 states. [2018-09-23 21:26:31,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:31,263 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-23 21:26:31,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-09-23 21:26:31,264 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2018-09-23 21:26:31,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:31,265 INFO L225 Difference]: With dead ends: 45 [2018-09-23 21:26:31,265 INFO L226 Difference]: Without dead ends: 43 [2018-09-23 21:26:31,266 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2018-09-23 21:26:31,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-23 21:26:31,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-09-23 21:26:31,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-09-23 21:26:31,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-09-23 21:26:31,271 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2018-09-23 21:26:31,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:31,272 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-09-23 21:26:31,272 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-23 21:26:31,272 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-09-23 21:26:31,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-09-23 21:26:31,273 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:31,273 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1] [2018-09-23 21:26:31,273 INFO L423 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:31,274 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:31,274 INFO L82 PathProgramCache]: Analyzing trace with hash -1737087723, now seen corresponding path program 19 times [2018-09-23 21:26:31,274 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:31,274 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:31,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:31,275 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:31,275 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:31,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:32,475 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:32,475 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:32,475 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:32,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:26:32,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:32,507 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:32,547 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:32,576 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:32,576 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 21 [2018-09-23 21:26:32,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-09-23 21:26:32,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-09-23 21:26:32,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-23 21:26:32,578 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 22 states. [2018-09-23 21:26:33,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:33,130 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-23 21:26:33,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-23 21:26:33,132 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 42 [2018-09-23 21:26:33,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:33,133 INFO L225 Difference]: With dead ends: 47 [2018-09-23 21:26:33,133 INFO L226 Difference]: Without dead ends: 45 [2018-09-23 21:26:33,133 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2018-09-23 21:26:33,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-09-23 21:26:33,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-09-23 21:26:33,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-23 21:26:33,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-23 21:26:33,140 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2018-09-23 21:26:33,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:33,140 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-23 21:26:33,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-09-23 21:26:33,141 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-23 21:26:33,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-23 21:26:33,141 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:33,142 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1] [2018-09-23 21:26:33,142 INFO L423 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:33,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:33,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1401028431, now seen corresponding path program 20 times [2018-09-23 21:26:33,142 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:33,143 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:33,143 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:33,144 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:26:33,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:33,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:34,951 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:34,951 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:34,952 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:34,965 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:26:34,986 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:26:34,987 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:34,988 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:35,021 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:35,052 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:35,052 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 22 [2018-09-23 21:26:35,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-23 21:26:35,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-23 21:26:35,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-23 21:26:35,054 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 23 states. [2018-09-23 21:26:35,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:35,430 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-23 21:26:35,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-09-23 21:26:35,431 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 44 [2018-09-23 21:26:35,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:35,432 INFO L225 Difference]: With dead ends: 49 [2018-09-23 21:26:35,432 INFO L226 Difference]: Without dead ends: 47 [2018-09-23 21:26:35,433 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2018-09-23 21:26:35,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-09-23 21:26:35,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-09-23 21:26:35,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-09-23 21:26:35,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-09-23 21:26:35,439 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2018-09-23 21:26:35,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:35,440 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-09-23 21:26:35,440 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-23 21:26:35,440 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-09-23 21:26:35,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-09-23 21:26:35,441 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:35,441 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1] [2018-09-23 21:26:35,441 INFO L423 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:35,441 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:35,441 INFO L82 PathProgramCache]: Analyzing trace with hash 2063610633, now seen corresponding path program 21 times [2018-09-23 21:26:35,442 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:35,442 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:35,442 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:35,442 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:35,443 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:35,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:35,851 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:35,851 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:35,852 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:35,861 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:26:38,191 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-09-23 21:26:38,191 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:38,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:38,293 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:38,314 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:38,314 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2018-09-23 21:26:38,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-09-23 21:26:38,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-09-23 21:26:38,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-23 21:26:38,315 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 24 states. [2018-09-23 21:26:38,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:38,670 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-23 21:26:38,673 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-23 21:26:38,673 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2018-09-23 21:26:38,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:38,674 INFO L225 Difference]: With dead ends: 51 [2018-09-23 21:26:38,674 INFO L226 Difference]: Without dead ends: 49 [2018-09-23 21:26:38,675 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2018-09-23 21:26:38,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-23 21:26:38,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-09-23 21:26:38,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-09-23 21:26:38,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-09-23 21:26:38,680 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2018-09-23 21:26:38,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:38,680 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-09-23 21:26:38,680 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-09-23 21:26:38,680 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-09-23 21:26:38,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-09-23 21:26:38,681 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:38,681 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1] [2018-09-23 21:26:38,681 INFO L423 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:38,681 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:38,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1145020349, now seen corresponding path program 22 times [2018-09-23 21:26:38,682 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:38,682 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:38,682 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:38,682 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:38,683 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:38,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:40,383 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:40,384 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:40,384 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:40,392 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:26:40,439 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:26:40,440 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:26:40,443 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:26:40,486 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:40,509 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:26:40,509 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 24 [2018-09-23 21:26:40,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-23 21:26:40,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-23 21:26:40,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-23 21:26:40,511 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 25 states. [2018-09-23 21:26:40,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:26:40,888 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-09-23 21:26:40,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-09-23 21:26:40,888 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 48 [2018-09-23 21:26:40,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:26:40,889 INFO L225 Difference]: With dead ends: 53 [2018-09-23 21:26:40,889 INFO L226 Difference]: Without dead ends: 51 [2018-09-23 21:26:40,890 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2018-09-23 21:26:40,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-09-23 21:26:40,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-09-23 21:26:40,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-23 21:26:40,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-23 21:26:40,897 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2018-09-23 21:26:40,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:26:40,897 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-23 21:26:40,897 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-23 21:26:40,897 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-23 21:26:40,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-23 21:26:40,898 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:26:40,898 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1] [2018-09-23 21:26:40,898 INFO L423 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:26:40,898 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:26:40,899 INFO L82 PathProgramCache]: Analyzing trace with hash -852875523, now seen corresponding path program 23 times [2018-09-23 21:26:40,899 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:26:40,899 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:26:40,899 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:40,899 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:26:40,900 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:26:40,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:26:41,430 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:26:41,431 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:26:41,431 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:26:41,442 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-23 21:28:11,976 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2018-09-23 21:28:11,977 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:28:12,351 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:12,385 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:12,390 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:12,391 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 25 [2018-09-23 21:28:12,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-09-23 21:28:12,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-09-23 21:28:12,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-23 21:28:12,392 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 26 states. [2018-09-23 21:28:12,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:12,825 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-09-23 21:28:12,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-23 21:28:12,826 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 50 [2018-09-23 21:28:12,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:12,827 INFO L225 Difference]: With dead ends: 55 [2018-09-23 21:28:12,827 INFO L226 Difference]: Without dead ends: 53 [2018-09-23 21:28:12,828 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2018-09-23 21:28:12,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-09-23 21:28:12,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-09-23 21:28:12,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-23 21:28:12,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-09-23 21:28:12,834 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2018-09-23 21:28:12,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:12,834 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-09-23 21:28:12,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-09-23 21:28:12,834 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-09-23 21:28:12,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-09-23 21:28:12,835 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:12,835 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1] [2018-09-23 21:28:12,835 INFO L423 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:12,835 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:12,835 INFO L82 PathProgramCache]: Analyzing trace with hash 725428023, now seen corresponding path program 24 times [2018-09-23 21:28:12,836 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:12,836 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:12,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:12,836 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:28:12,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:12,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:13,825 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:13,825 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:13,825 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:13,833 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-23 21:28:52,665 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2018-09-23 21:28:52,665 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:28:52,680 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:52,813 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:52,834 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:52,834 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 26 [2018-09-23 21:28:52,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-23 21:28:52,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-23 21:28:52,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-23 21:28:52,835 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 27 states. [2018-09-23 21:28:53,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:53,272 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-23 21:28:53,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-09-23 21:28:53,273 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 52 [2018-09-23 21:28:53,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:53,273 INFO L225 Difference]: With dead ends: 57 [2018-09-23 21:28:53,274 INFO L226 Difference]: Without dead ends: 55 [2018-09-23 21:28:53,274 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2018-09-23 21:28:53,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-23 21:28:53,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-09-23 21:28:53,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-09-23 21:28:53,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-09-23 21:28:53,280 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2018-09-23 21:28:53,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:53,281 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-09-23 21:28:53,281 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-23 21:28:53,281 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-09-23 21:28:53,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-09-23 21:28:53,282 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:53,282 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1] [2018-09-23 21:28:53,282 INFO L423 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:53,282 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:53,282 INFO L82 PathProgramCache]: Analyzing trace with hash 1351680241, now seen corresponding path program 25 times [2018-09-23 21:28:53,282 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:53,283 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:53,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:53,283 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:28:53,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:53,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:54,093 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:54,094 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:54,094 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:54,101 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:28:54,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:54,127 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:54,149 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:54,170 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:54,170 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 27 [2018-09-23 21:28:54,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-09-23 21:28:54,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-09-23 21:28:54,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-23 21:28:54,171 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 28 states. [2018-09-23 21:28:54,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:54,667 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-09-23 21:28:54,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-23 21:28:54,668 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 54 [2018-09-23 21:28:54,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:54,669 INFO L225 Difference]: With dead ends: 59 [2018-09-23 21:28:54,669 INFO L226 Difference]: Without dead ends: 57 [2018-09-23 21:28:54,670 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2018-09-23 21:28:54,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-09-23 21:28:54,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-09-23 21:28:54,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-23 21:28:54,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-23 21:28:54,675 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2018-09-23 21:28:54,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:54,675 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-23 21:28:54,675 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-09-23 21:28:54,675 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-23 21:28:54,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-23 21:28:54,676 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:54,676 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1] [2018-09-23 21:28:54,676 INFO L423 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:54,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:54,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1884640299, now seen corresponding path program 26 times [2018-09-23 21:28:54,676 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:54,676 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:54,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:54,677 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-23 21:28:54,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:54,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:55,274 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:55,275 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:55,275 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:55,283 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-23 21:28:55,314 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-23 21:28:55,314 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:28:55,316 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:28:55,352 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:55,372 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:28:55,372 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 28 [2018-09-23 21:28:55,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-09-23 21:28:55,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-09-23 21:28:55,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-23 21:28:55,373 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 29 states. [2018-09-23 21:28:55,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:28:55,981 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-09-23 21:28:55,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-09-23 21:28:55,982 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 56 [2018-09-23 21:28:55,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:28:55,982 INFO L225 Difference]: With dead ends: 61 [2018-09-23 21:28:55,982 INFO L226 Difference]: Without dead ends: 59 [2018-09-23 21:28:55,983 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2018-09-23 21:28:55,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-23 21:28:55,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-09-23 21:28:55,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-09-23 21:28:55,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2018-09-23 21:28:55,987 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2018-09-23 21:28:55,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:28:55,988 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2018-09-23 21:28:55,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-09-23 21:28:55,988 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2018-09-23 21:28:55,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2018-09-23 21:28:55,988 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:28:55,989 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1] [2018-09-23 21:28:55,989 INFO L423 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:28:55,989 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:28:55,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1336819483, now seen corresponding path program 27 times [2018-09-23 21:28:55,989 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:28:55,989 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:28:55,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:55,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:28:55,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:28:56,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:28:56,726 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:28:56,726 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:28:56,726 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:28:56,736 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-23 21:29:14,887 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-09-23 21:29:14,887 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:29:14,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:29:14,975 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:29:14,995 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:29:14,995 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 29 [2018-09-23 21:29:14,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-09-23 21:29:14,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-09-23 21:29:14,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-23 21:29:14,996 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 30 states. [2018-09-23 21:29:15,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:29:15,574 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-23 21:29:15,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-09-23 21:29:15,575 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 58 [2018-09-23 21:29:15,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:29:15,576 INFO L225 Difference]: With dead ends: 63 [2018-09-23 21:29:15,576 INFO L226 Difference]: Without dead ends: 61 [2018-09-23 21:29:15,577 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2018-09-23 21:29:15,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-23 21:29:15,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2018-09-23 21:29:15,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-09-23 21:29:15,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2018-09-23 21:29:15,581 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2018-09-23 21:29:15,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:29:15,582 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2018-09-23 21:29:15,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-09-23 21:29:15,582 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2018-09-23 21:29:15,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-09-23 21:29:15,582 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:29:15,583 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1] [2018-09-23 21:29:15,583 INFO L423 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:29:15,583 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:29:15,583 INFO L82 PathProgramCache]: Analyzing trace with hash -488249569, now seen corresponding path program 28 times [2018-09-23 21:29:15,583 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:29:15,583 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:29:15,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:29:15,584 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:29:15,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:29:15,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:29:16,419 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:29:16,419 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:29:16,419 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:29:16,427 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-23 21:29:16,456 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-23 21:29:16,457 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-23 21:29:16,459 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-23 21:29:16,490 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:29:16,510 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-09-23 21:29:16,510 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 30 [2018-09-23 21:29:16,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-09-23 21:29:16,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-09-23 21:29:16,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-23 21:29:16,511 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 31 states. [2018-09-23 21:29:17,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-23 21:29:17,119 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-09-23 21:29:17,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-09-23 21:29:17,119 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 60 [2018-09-23 21:29:17,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-23 21:29:17,120 INFO L225 Difference]: With dead ends: 65 [2018-09-23 21:29:17,121 INFO L226 Difference]: Without dead ends: 63 [2018-09-23 21:29:17,122 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2018-09-23 21:29:17,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-09-23 21:29:17,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2018-09-23 21:29:17,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-23 21:29:17,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-23 21:29:17,126 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2018-09-23 21:29:17,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-23 21:29:17,126 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-23 21:29:17,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-09-23 21:29:17,126 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-23 21:29:17,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-23 21:29:17,127 INFO L367 BasicCegarLoop]: Found error trace [2018-09-23 21:29:17,127 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1] [2018-09-23 21:29:17,127 INFO L423 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2018-09-23 21:29:17,127 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-09-23 21:29:17,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1056348455, now seen corresponding path program 29 times [2018-09-23 21:29:17,128 INFO L227 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-09-23 21:29:17,128 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-09-23 21:29:17,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:29:17,128 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-23 21:29:17,129 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-23 21:29:17,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-23 21:29:17,727 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-23 21:29:17,727 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-23 21:29:17,728 INFO L227 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-23 21:29:17,735 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown