java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8c3fbe1 [2018-10-22 16:00:21,123 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 16:00:21,128 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 16:00:21,145 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 16:00:21,146 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 16:00:21,147 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 16:00:21,148 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 16:00:21,150 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 16:00:21,151 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 16:00:21,152 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 16:00:21,153 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 16:00:21,154 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 16:00:21,155 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 16:00:21,155 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 16:00:21,157 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 16:00:21,158 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 16:00:21,158 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 16:00:21,160 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 16:00:21,162 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 16:00:21,164 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 16:00:21,165 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 16:00:21,166 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 16:00:21,169 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-10-22 16:00:21,178 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-22 16:00:21,204 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 16:00:21,205 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 16:00:21,205 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 16:00:21,206 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 16:00:21,206 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 16:00:21,206 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 16:00:21,206 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 16:00:21,206 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 16:00:21,207 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-22 16:00:21,207 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 16:00:21,207 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 16:00:21,207 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 16:00:21,208 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 16:00:21,208 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 16:00:21,208 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 16:00:21,209 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 16:00:21,209 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 16:00:21,209 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 16:00:21,209 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 16:00:21,209 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 16:00:21,210 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 16:00:21,210 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 16:00:21,210 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 16:00:21,210 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 16:00:21,210 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:21,211 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 16:00:21,211 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 16:00:21,211 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 16:00:21,211 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 16:00:21,211 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 16:00:21,212 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 16:00:21,212 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 16:00:21,212 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-22 16:00:21,212 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-22 16:00:21,256 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 16:00:21,273 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 16:00:21,276 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 16:00:21,278 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 16:00:21,279 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 16:00:21,280 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-22 16:00:21,352 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/49d6440ea/87617ba8f0d04b18b67b30c95b2db2e8/FLAGead67d651 [2018-10-22 16:00:21,861 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 16:00:21,862 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_false-unreach-call3_true-termination.i [2018-10-22 16:00:21,869 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/49d6440ea/87617ba8f0d04b18b67b30c95b2db2e8/FLAGead67d651 [2018-10-22 16:00:21,889 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/49d6440ea/87617ba8f0d04b18b67b30c95b2db2e8 [2018-10-22 16:00:21,902 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 16:00:21,904 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-22 16:00:21,905 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:21,905 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 16:00:21,909 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 16:00:21,910 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:21" (1/1) ... [2018-10-22 16:00:21,913 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7aa8ab6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:21, skipping insertion in model container [2018-10-22 16:00:21,913 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 04:00:21" (1/1) ... [2018-10-22 16:00:21,924 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 16:00:21,949 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 16:00:22,163 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:22,168 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 16:00:22,195 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 16:00:22,226 INFO L193 MainTranslator]: Completed translation [2018-10-22 16:00:22,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22 WrapperNode [2018-10-22 16:00:22,227 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 16:00:22,228 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:22,228 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 16:00:22,228 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 16:00:22,240 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,255 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,281 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 16:00:22,283 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 16:00:22,283 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 16:00:22,283 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 16:00:22,295 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,295 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,297 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,297 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,311 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,317 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,320 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... [2018-10-22 16:00:22,329 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 16:00:22,331 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 16:00:22,332 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 16:00:22,332 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 16:00:22,334 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 16:00:22,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 16:00:22,504 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 16:00:22,505 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 16:00:22,505 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 16:00:22,505 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 16:00:22,505 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 16:00:22,505 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 16:00:22,505 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 16:00:22,965 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 16:00:22,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:22 BoogieIcfgContainer [2018-10-22 16:00:22,966 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 16:00:22,967 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 16:00:22,967 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 16:00:22,970 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 16:00:22,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 04:00:21" (1/3) ... [2018-10-22 16:00:22,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72dad3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:22, skipping insertion in model container [2018-10-22 16:00:22,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 04:00:22" (2/3) ... [2018-10-22 16:00:22,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72dad3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 04:00:22, skipping insertion in model container [2018-10-22 16:00:22,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 04:00:22" (3/3) ... [2018-10-22 16:00:22,974 INFO L112 eAbstractionObserver]: Analyzing ICFG array_false-unreach-call3_true-termination.i [2018-10-22 16:00:22,985 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 16:00:22,996 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 16:00:23,015 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 16:00:23,049 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 16:00:23,049 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 16:00:23,050 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 16:00:23,050 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 16:00:23,050 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 16:00:23,050 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 16:00:23,050 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 16:00:23,050 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 16:00:23,051 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 16:00:23,070 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2018-10-22 16:00:23,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 16:00:23,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:23,078 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:23,081 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:23,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:23,092 INFO L82 PathProgramCache]: Analyzing trace with hash 1097964223, now seen corresponding path program 1 times [2018-10-22 16:00:23,095 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:23,148 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:23,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:23,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:23,149 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:23,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:23,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:23,237 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:23,238 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 16:00:23,238 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:23,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 16:00:23,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 16:00:23,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:23,260 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2018-10-22 16:00:23,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:23,289 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2018-10-22 16:00:23,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 16:00:23,291 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-22 16:00:23,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:23,308 INFO L225 Difference]: With dead ends: 41 [2018-10-22 16:00:23,308 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 16:00:23,314 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 16:00:23,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 16:00:23,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 16:00:23,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 16:00:23,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-22 16:00:23,355 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-22 16:00:23,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:23,356 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-22 16:00:23,356 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 16:00:23,357 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-22 16:00:23,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 16:00:23,358 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:23,359 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:23,359 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:23,361 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:23,361 INFO L82 PathProgramCache]: Analyzing trace with hash 1413574900, now seen corresponding path program 1 times [2018-10-22 16:00:23,362 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:23,363 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:23,364 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:23,365 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:23,365 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:23,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:23,473 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:23,474 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 16:00:23,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 16:00:23,474 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:23,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 16:00:23,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 16:00:23,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:23,477 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2018-10-22 16:00:23,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:23,596 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-22 16:00:23,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 16:00:23,596 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-22 16:00:23,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:23,600 INFO L225 Difference]: With dead ends: 34 [2018-10-22 16:00:23,600 INFO L226 Difference]: Without dead ends: 25 [2018-10-22 16:00:23,601 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 16:00:23,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-10-22 16:00:23,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2018-10-22 16:00:23,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 16:00:23,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-22 16:00:23,608 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2018-10-22 16:00:23,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:23,608 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-22 16:00:23,608 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 16:00:23,608 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-22 16:00:23,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-22 16:00:23,609 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:23,609 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:23,610 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:23,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:23,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1818930225, now seen corresponding path program 1 times [2018-10-22 16:00:23,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:23,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:23,611 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:23,612 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:23,612 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:23,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:23,730 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 16:00:23,731 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:23,731 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:23,732 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-22 16:00:23,734 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [38], [41], [43], [49], [50], [51], [53] [2018-10-22 16:00:23,785 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:23,785 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:24,446 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-22 16:00:24,448 INFO L272 AbstractInterpreter]: Visited 16 different actions 48 times. Merged at 3 different actions 24 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 30 variables. [2018-10-22 16:00:24,491 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:24,491 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-22 16:00:24,648 INFO L232 lantSequenceWeakener]: Weakened 16 states. On average, predicates are now at 84.88% of their original sizes. [2018-10-22 16:00:24,648 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-22 16:00:24,882 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-22 16:00:24,883 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-22 16:00:24,883 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [9] imperfect sequences [4] total 11 [2018-10-22 16:00:24,883 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 16:00:24,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:00:24,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:00:24,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:00:24,885 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 9 states. [2018-10-22 16:00:25,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:25,633 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2018-10-22 16:00:25,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 16:00:25,634 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 18 [2018-10-22 16:00:25,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:25,638 INFO L225 Difference]: With dead ends: 41 [2018-10-22 16:00:25,639 INFO L226 Difference]: Without dead ends: 29 [2018-10-22 16:00:25,640 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-10-22 16:00:25,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-22 16:00:25,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 25. [2018-10-22 16:00:25,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-22 16:00:25,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-22 16:00:25,659 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 18 [2018-10-22 16:00:25,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:25,659 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-22 16:00:25,659 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:00:25,660 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-22 16:00:25,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-22 16:00:25,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:25,662 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:25,663 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:25,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:25,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1343240274, now seen corresponding path program 1 times [2018-10-22 16:00:25,664 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:25,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:25,666 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:25,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:25,667 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:25,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:25,985 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:25,985 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:25,985 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:25,985 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-22 16:00:25,986 INFO L202 CegarAbsIntRunner]: [0], [1], [5], [9], [12], [14], [16], [20], [24], [27], [29], [31], [38], [41], [43], [49], [50], [51], [53] [2018-10-22 16:00:25,988 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 16:00:25,988 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 16:00:26,554 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 16:00:26,555 INFO L272 AbstractInterpreter]: Visited 19 different actions 107 times. Merged at 7 different actions 56 times. Widened at 2 different actions 8 times. Found 2 fixpoints after 2 different actions. Largest state had 31 variables. [2018-10-22 16:00:26,593 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:26,594 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 16:00:26,595 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:26,595 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:26,609 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:26,610 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:26,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:26,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:26,747 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:26,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:26,940 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:26,964 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:26,964 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:26,982 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:26,983 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:27,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:27,034 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:27,040 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:27,041 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:27,092 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:27,097 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:27,098 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-10-22 16:00:27,098 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:27,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-22 16:00:27,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-22 16:00:27,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:00:27,100 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 6 states. [2018-10-22 16:00:27,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:27,272 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2018-10-22 16:00:27,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 16:00:27,272 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2018-10-22 16:00:27,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:27,273 INFO L225 Difference]: With dead ends: 49 [2018-10-22 16:00:27,273 INFO L226 Difference]: Without dead ends: 38 [2018-10-22 16:00:27,274 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-22 16:00:27,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-22 16:00:27,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2018-10-22 16:00:27,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-22 16:00:27,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-10-22 16:00:27,289 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 24 [2018-10-22 16:00:27,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:27,290 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-10-22 16:00:27,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-22 16:00:27,290 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-10-22 16:00:27,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-22 16:00:27,291 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:27,291 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:27,292 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:27,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:27,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1859017687, now seen corresponding path program 2 times [2018-10-22 16:00:27,292 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:27,293 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:27,294 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:27,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:27,294 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:27,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:27,659 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:27,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:27,660 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:27,660 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:27,661 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:27,661 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:27,661 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:27,674 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:27,674 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:27,731 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:27,731 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:27,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:27,836 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:27,836 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:28,636 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:28,671 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:28,672 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:28,716 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:28,716 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:28,779 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:28,779 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:28,785 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:28,790 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:28,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:28,825 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:28,827 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:28,827 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-10-22 16:00:28,827 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:28,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 16:00:28,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 16:00:28,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:00:28,829 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 7 states. [2018-10-22 16:00:28,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:28,931 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2018-10-22 16:00:28,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 16:00:28,931 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2018-10-22 16:00:28,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:28,932 INFO L225 Difference]: With dead ends: 56 [2018-10-22 16:00:28,932 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 16:00:28,933 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-10-22 16:00:28,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 16:00:28,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 31. [2018-10-22 16:00:28,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-22 16:00:28,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-10-22 16:00:28,941 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 27 [2018-10-22 16:00:28,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:28,941 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-10-22 16:00:28,941 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 16:00:28,941 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-10-22 16:00:28,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-22 16:00:28,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:28,942 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:28,942 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:28,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:28,943 INFO L82 PathProgramCache]: Analyzing trace with hash -9056718, now seen corresponding path program 3 times [2018-10-22 16:00:28,943 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:28,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:28,944 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:28,944 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:28,944 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:28,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:29,094 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-22 16:00:29,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:29,094 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:29,095 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:29,095 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:29,095 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:29,095 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:29,112 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:29,113 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:29,161 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-22 16:00:29,161 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:29,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:29,271 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:00:29,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:29,346 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:00:29,367 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:29,367 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:29,383 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:29,383 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:29,433 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-22 16:00:29,433 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:29,438 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:29,444 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:00:29,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:29,476 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-22 16:00:29,478 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:29,478 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6, 6, 6] total 14 [2018-10-22 16:00:29,478 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:29,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:00:29,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:00:29,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-10-22 16:00:29,479 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2018-10-22 16:00:30,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:30,306 INFO L93 Difference]: Finished difference Result 65 states and 71 transitions. [2018-10-22 16:00:30,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:00:30,306 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2018-10-22 16:00:30,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:30,308 INFO L225 Difference]: With dead ends: 65 [2018-10-22 16:00:30,308 INFO L226 Difference]: Without dead ends: 48 [2018-10-22 16:00:30,309 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:00:30,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-22 16:00:30,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2018-10-22 16:00:30,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-22 16:00:30,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2018-10-22 16:00:30,319 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 30 [2018-10-22 16:00:30,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:30,319 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2018-10-22 16:00:30,319 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:00:30,319 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2018-10-22 16:00:30,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-22 16:00:30,320 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:30,321 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:30,321 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:30,321 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:30,321 INFO L82 PathProgramCache]: Analyzing trace with hash -973804553, now seen corresponding path program 4 times [2018-10-22 16:00:30,321 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:30,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:30,322 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:30,322 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:30,323 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:30,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:30,649 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:30,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,649 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:30,649 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:30,649 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:30,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,650 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:30,657 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:30,657 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:30,719 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:30,719 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:30,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:30,741 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:30,741 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:30,973 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:30,994 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:30,994 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:31,011 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:31,011 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:31,100 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:31,100 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:31,106 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:31,113 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:31,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:31,129 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:31,131 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:31,131 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 15 [2018-10-22 16:00:31,131 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:31,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 16:00:31,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 16:00:31,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:00:31,134 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 9 states. [2018-10-22 16:00:31,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:31,408 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2018-10-22 16:00:31,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 16:00:31,409 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 45 [2018-10-22 16:00:31,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:31,410 INFO L225 Difference]: With dead ends: 78 [2018-10-22 16:00:31,410 INFO L226 Difference]: Without dead ends: 55 [2018-10-22 16:00:31,412 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-22 16:00:31,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-10-22 16:00:31,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2018-10-22 16:00:31,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-22 16:00:31,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-22 16:00:31,426 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 45 [2018-10-22 16:00:31,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:31,428 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-22 16:00:31,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 16:00:31,428 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-22 16:00:31,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-22 16:00:31,429 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:31,430 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:31,430 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:31,430 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:31,430 INFO L82 PathProgramCache]: Analyzing trace with hash 368352658, now seen corresponding path program 5 times [2018-10-22 16:00:31,430 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:31,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:31,431 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:31,431 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:31,431 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:31,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:31,662 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:31,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:31,662 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:31,662 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:31,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:31,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:31,663 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:31,674 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:31,674 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:31,725 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:00:31,725 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:31,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:31,756 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:31,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:31,890 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:31,919 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:31,920 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:31,938 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:31,938 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:32,106 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-10-22 16:00:32,107 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:32,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:32,119 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:32,119 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:32,184 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:32,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:32,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-10-22 16:00:32,187 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:32,188 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 16:00:32,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 16:00:32,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:00:32,189 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 10 states. [2018-10-22 16:00:32,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:32,386 INFO L93 Difference]: Finished difference Result 85 states and 89 transitions. [2018-10-22 16:00:32,387 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 16:00:32,387 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 48 [2018-10-22 16:00:32,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:32,388 INFO L225 Difference]: With dead ends: 85 [2018-10-22 16:00:32,389 INFO L226 Difference]: Without dead ends: 62 [2018-10-22 16:00:32,389 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-10-22 16:00:32,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-22 16:00:32,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2018-10-22 16:00:32,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-22 16:00:32,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2018-10-22 16:00:32,399 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 48 [2018-10-22 16:00:32,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:32,399 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2018-10-22 16:00:32,399 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 16:00:32,399 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2018-10-22 16:00:32,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-22 16:00:32,400 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:32,400 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:32,401 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:32,401 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:32,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1571700201, now seen corresponding path program 6 times [2018-10-22 16:00:32,401 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:32,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,402 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:32,402 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:32,402 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:32,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:32,529 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:32,529 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,529 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:32,530 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:32,530 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:32,530 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,530 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:32,538 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:32,539 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:32,630 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:00:32,630 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:32,633 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:32,661 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:32,661 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:32,844 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:32,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:32,866 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:32,881 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:32,882 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:33,114 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-10-22 16:00:33,114 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:33,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:33,126 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:33,127 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:33,145 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:33,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:33,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-10-22 16:00:33,148 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:33,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 16:00:33,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 16:00:33,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:00:33,150 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 11 states. [2018-10-22 16:00:33,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:33,392 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2018-10-22 16:00:33,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 16:00:33,392 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 51 [2018-10-22 16:00:33,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:33,394 INFO L225 Difference]: With dead ends: 92 [2018-10-22 16:00:33,394 INFO L226 Difference]: Without dead ends: 69 [2018-10-22 16:00:33,395 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-22 16:00:33,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-22 16:00:33,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 55. [2018-10-22 16:00:33,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-10-22 16:00:33,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2018-10-22 16:00:33,405 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 51 [2018-10-22 16:00:33,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:33,405 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2018-10-22 16:00:33,405 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 16:00:33,405 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2018-10-22 16:00:33,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-10-22 16:00:33,406 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:33,406 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:33,407 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:33,407 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:33,407 INFO L82 PathProgramCache]: Analyzing trace with hash -311520398, now seen corresponding path program 7 times [2018-10-22 16:00:33,407 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:33,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,408 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:33,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:33,408 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:33,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:33,540 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:33,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:33,541 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:33,541 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:33,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:33,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:33,541 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:33,549 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:33,550 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:33,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:33,596 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:33,626 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:33,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:33,809 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:33,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:33,832 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:33,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:33,847 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:33,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:33,948 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:33,955 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:33,956 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:33,978 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:33,980 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:33,980 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 21 [2018-10-22 16:00:33,981 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:33,981 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 16:00:33,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 16:00:33,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:00:33,982 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 12 states. [2018-10-22 16:00:34,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:34,270 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2018-10-22 16:00:34,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 16:00:34,272 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 54 [2018-10-22 16:00:34,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:34,273 INFO L225 Difference]: With dead ends: 99 [2018-10-22 16:00:34,273 INFO L226 Difference]: Without dead ends: 76 [2018-10-22 16:00:34,274 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 206 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-22 16:00:34,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-22 16:00:34,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 58. [2018-10-22 16:00:34,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-22 16:00:34,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2018-10-22 16:00:34,283 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 54 [2018-10-22 16:00:34,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:34,284 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2018-10-22 16:00:34,284 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 16:00:34,284 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2018-10-22 16:00:34,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-22 16:00:34,285 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:34,285 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:34,285 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:34,286 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:34,286 INFO L82 PathProgramCache]: Analyzing trace with hash -604143561, now seen corresponding path program 8 times [2018-10-22 16:00:34,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:34,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:34,287 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:34,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:34,287 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:34,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:34,506 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:34,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,507 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:34,507 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:34,507 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:34,507 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,507 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:34,517 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:34,517 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:34,559 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:34,560 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:34,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:34,581 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:34,582 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:34,918 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:34,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:34,939 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:34,954 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:34,954 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:35,047 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:35,047 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:35,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:35,059 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:35,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:35,072 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:35,074 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:35,074 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 23 [2018-10-22 16:00:35,074 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:35,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 16:00:35,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 16:00:35,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:00:35,075 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 13 states. [2018-10-22 16:00:35,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:35,240 INFO L93 Difference]: Finished difference Result 106 states and 113 transitions. [2018-10-22 16:00:35,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 16:00:35,243 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 57 [2018-10-22 16:00:35,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:35,244 INFO L225 Difference]: With dead ends: 106 [2018-10-22 16:00:35,245 INFO L226 Difference]: Without dead ends: 83 [2018-10-22 16:00:35,245 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 217 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2018-10-22 16:00:35,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-10-22 16:00:35,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 61. [2018-10-22 16:00:35,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-10-22 16:00:35,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2018-10-22 16:00:35,256 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 57 [2018-10-22 16:00:35,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:35,257 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2018-10-22 16:00:35,257 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 16:00:35,257 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2018-10-22 16:00:35,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-10-22 16:00:35,258 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:35,258 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:35,258 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:35,258 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:35,259 INFO L82 PathProgramCache]: Analyzing trace with hash 642818386, now seen corresponding path program 9 times [2018-10-22 16:00:35,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:35,259 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:35,260 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:35,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:35,260 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:35,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:35,512 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-22 16:00:35,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,513 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:35,513 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:35,513 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:35,513 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,513 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:35,522 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:35,522 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:35,570 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:00:35,571 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:35,575 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:35,636 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:00:35,636 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:35,793 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:00:35,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:35,815 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:35,832 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:35,832 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:36,009 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-22 16:00:36,010 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:36,024 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:00:36,024 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:36,040 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-10-22 16:00:36,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:36,044 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10, 10, 10] total 24 [2018-10-22 16:00:36,044 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:36,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:00:36,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:00:36,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2018-10-22 16:00:36,046 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand 16 states. [2018-10-22 16:00:36,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:36,476 INFO L93 Difference]: Finished difference Result 115 states and 123 transitions. [2018-10-22 16:00:36,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:00:36,477 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 60 [2018-10-22 16:00:36,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:36,478 INFO L225 Difference]: With dead ends: 115 [2018-10-22 16:00:36,478 INFO L226 Difference]: Without dead ends: 84 [2018-10-22 16:00:36,479 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 229 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2018-10-22 16:00:36,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-10-22 16:00:36,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2018-10-22 16:00:36,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2018-10-22 16:00:36,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2018-10-22 16:00:36,505 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 60 [2018-10-22 16:00:36,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:36,505 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2018-10-22 16:00:36,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:00:36,506 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2018-10-22 16:00:36,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-10-22 16:00:36,507 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:36,507 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:36,507 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:36,508 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:36,508 INFO L82 PathProgramCache]: Analyzing trace with hash 586766679, now seen corresponding path program 10 times [2018-10-22 16:00:36,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:36,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:36,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:36,509 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:36,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:36,861 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:36,861 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,861 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:36,861 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:36,862 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:36,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:36,862 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:00:36,871 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:36,872 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:36,936 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:36,936 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:36,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:36,959 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:36,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:37,215 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:37,237 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:37,237 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:37,253 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:37,253 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:37,398 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:37,398 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:37,405 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:37,414 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:37,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:37,434 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:37,436 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:37,437 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 27 [2018-10-22 16:00:37,437 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:37,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-22 16:00:37,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-22 16:00:37,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:00:37,438 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand 15 states. [2018-10-22 16:00:37,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:37,645 INFO L93 Difference]: Finished difference Result 132 states and 135 transitions. [2018-10-22 16:00:37,646 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 16:00:37,646 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 81 [2018-10-22 16:00:37,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:37,647 INFO L225 Difference]: With dead ends: 132 [2018-10-22 16:00:37,647 INFO L226 Difference]: Without dead ends: 91 [2018-10-22 16:00:37,648 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 311 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-22 16:00:37,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-10-22 16:00:37,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2018-10-22 16:00:37,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2018-10-22 16:00:37,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2018-10-22 16:00:37,663 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 81 [2018-10-22 16:00:37,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:37,663 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2018-10-22 16:00:37,663 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-22 16:00:37,663 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2018-10-22 16:00:37,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-10-22 16:00:37,665 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:37,665 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:37,665 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:37,665 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:37,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1890477710, now seen corresponding path program 11 times [2018-10-22 16:00:37,666 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:37,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:37,666 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:37,667 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:37,667 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:37,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:37,976 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:37,976 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:37,977 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:37,977 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:37,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:37,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:37,977 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:00:37,989 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:37,989 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:38,137 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-22 16:00:38,138 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:38,141 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:38,157 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:38,157 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:38,420 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:38,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:38,442 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:38,457 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:38,457 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:39,262 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2018-10-22 16:00:39,262 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:39,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:39,279 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:39,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:39,302 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:39,303 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:39,304 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 29 [2018-10-22 16:00:39,304 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:39,304 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 16:00:39,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 16:00:39,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:00:39,306 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand 16 states. [2018-10-22 16:00:39,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:39,528 INFO L93 Difference]: Finished difference Result 139 states and 143 transitions. [2018-10-22 16:00:39,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 16:00:39,528 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 84 [2018-10-22 16:00:39,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:39,529 INFO L225 Difference]: With dead ends: 139 [2018-10-22 16:00:39,529 INFO L226 Difference]: Without dead ends: 98 [2018-10-22 16:00:39,530 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 322 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2018-10-22 16:00:39,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-10-22 16:00:39,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 88. [2018-10-22 16:00:39,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-10-22 16:00:39,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2018-10-22 16:00:39,544 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 84 [2018-10-22 16:00:39,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:39,544 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2018-10-22 16:00:39,544 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 16:00:39,544 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2018-10-22 16:00:39,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-10-22 16:00:39,545 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:39,546 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:39,546 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:39,546 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:39,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1055023241, now seen corresponding path program 12 times [2018-10-22 16:00:39,546 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:39,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,547 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:39,547 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:39,547 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:39,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:40,681 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:40,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,681 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:40,682 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:40,682 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:40,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:40,682 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:00:40,689 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:40,690 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:41,007 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2018-10-22 16:00:41,007 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:41,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:41,026 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:41,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:41,609 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:41,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:41,630 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:41,646 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:41,646 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:43,063 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 14 check-sat command(s) [2018-10-22 16:00:43,064 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:43,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:43,078 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:43,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,098 INFO L134 CoverageAnalysis]: Checked inductivity of 447 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:43,100 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:43,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 31 [2018-10-22 16:00:43,101 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:43,101 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-22 16:00:43,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-22 16:00:43,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:00:43,102 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand 17 states. [2018-10-22 16:00:43,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:43,284 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2018-10-22 16:00:43,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-22 16:00:43,285 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 87 [2018-10-22 16:00:43,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:43,286 INFO L225 Difference]: With dead ends: 146 [2018-10-22 16:00:43,287 INFO L226 Difference]: Without dead ends: 105 [2018-10-22 16:00:43,288 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 362 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-22 16:00:43,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-10-22 16:00:43,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 91. [2018-10-22 16:00:43,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-10-22 16:00:43,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2018-10-22 16:00:43,301 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 87 [2018-10-22 16:00:43,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:43,301 INFO L481 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2018-10-22 16:00:43,301 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-22 16:00:43,302 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2018-10-22 16:00:43,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2018-10-22 16:00:43,303 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:43,303 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:43,303 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:43,303 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:43,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1366417582, now seen corresponding path program 13 times [2018-10-22 16:00:43,304 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:43,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:43,304 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:43,304 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:43,305 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:43,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:43,567 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:43,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:43,567 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:43,567 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:43,567 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:43,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:43,568 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:00:43,576 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:43,576 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:43,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:43,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:43,663 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:43,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:43,984 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:44,007 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,007 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:44,022 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:44,023 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:00:44,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:44,165 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:44,175 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:44,175 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:44,197 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:44,199 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:44,199 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 33 [2018-10-22 16:00:44,199 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:44,200 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 16:00:44,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 16:00:44,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:00:44,201 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand 18 states. [2018-10-22 16:00:44,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:44,533 INFO L93 Difference]: Finished difference Result 153 states and 159 transitions. [2018-10-22 16:00:44,534 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-22 16:00:44,534 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 90 [2018-10-22 16:00:44,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:44,535 INFO L225 Difference]: With dead ends: 153 [2018-10-22 16:00:44,535 INFO L226 Difference]: Without dead ends: 112 [2018-10-22 16:00:44,536 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 375 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 16:00:44,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2018-10-22 16:00:44,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 94. [2018-10-22 16:00:44,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-10-22 16:00:44,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2018-10-22 16:00:44,555 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 90 [2018-10-22 16:00:44,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:44,555 INFO L481 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2018-10-22 16:00:44,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 16:00:44,555 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2018-10-22 16:00:44,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-10-22 16:00:44,556 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:44,556 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:44,558 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:44,558 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:44,559 INFO L82 PathProgramCache]: Analyzing trace with hash -985870953, now seen corresponding path program 14 times [2018-10-22 16:00:44,559 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:44,559 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:44,560 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:00:44,560 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:44,560 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:44,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:44,896 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:44,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,896 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:44,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:44,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:44,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:44,897 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:00:44,905 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:44,906 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:44,985 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:44,985 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:44,990 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:45,020 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:45,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:45,834 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:45,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:45,858 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:45,875 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:00:45,875 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:46,029 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:00:46,029 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:46,036 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:46,048 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:46,048 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:46,106 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:46,108 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:46,108 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 35 [2018-10-22 16:00:46,108 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:46,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-22 16:00:46,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-22 16:00:46,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:00:46,109 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand 19 states. [2018-10-22 16:00:46,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:46,422 INFO L93 Difference]: Finished difference Result 160 states and 167 transitions. [2018-10-22 16:00:46,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 16:00:46,423 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 93 [2018-10-22 16:00:46,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:46,423 INFO L225 Difference]: With dead ends: 160 [2018-10-22 16:00:46,424 INFO L226 Difference]: Without dead ends: 119 [2018-10-22 16:00:46,425 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 355 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=595, Invalid=595, Unknown=0, NotChecked=0, Total=1190 [2018-10-22 16:00:46,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-22 16:00:46,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 97. [2018-10-22 16:00:46,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-22 16:00:46,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-22 16:00:46,437 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 93 [2018-10-22 16:00:46,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:46,437 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-22 16:00:46,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-22 16:00:46,437 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-22 16:00:46,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-22 16:00:46,438 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:46,438 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:46,439 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:46,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:46,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1460059442, now seen corresponding path program 15 times [2018-10-22 16:00:46,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:46,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:46,440 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:46,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:46,440 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:46,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:47,206 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2018-10-22 16:00:47,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,207 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:47,207 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:47,207 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:47,207 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:47,207 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-22 16:00:47,215 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:47,215 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:47,393 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-22 16:00:47,393 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:47,396 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:47,482 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-22 16:00:47,482 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:48,472 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-22 16:00:48,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:48,493 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:48,509 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:00:48,510 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:00:49,423 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-22 16:00:49,423 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:49,431 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:49,443 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-22 16:00:49,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:49,475 INFO L134 CoverageAnalysis]: Checked inductivity of 579 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2018-10-22 16:00:49,477 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:49,477 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 16, 16, 16] total 36 [2018-10-22 16:00:49,477 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:49,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:00:49,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:00:49,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=754, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 16:00:49,479 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 22 states. [2018-10-22 16:00:49,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:49,732 INFO L93 Difference]: Finished difference Result 169 states and 177 transitions. [2018-10-22 16:00:49,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:00:49,732 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 96 [2018-10-22 16:00:49,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:49,734 INFO L225 Difference]: With dead ends: 169 [2018-10-22 16:00:49,734 INFO L226 Difference]: Without dead ends: 120 [2018-10-22 16:00:49,735 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 16:00:49,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2018-10-22 16:00:49,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2018-10-22 16:00:49,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-10-22 16:00:49,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2018-10-22 16:00:49,753 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 96 [2018-10-22 16:00:49,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:49,753 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2018-10-22 16:00:49,754 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:00:49,754 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2018-10-22 16:00:49,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-10-22 16:00:49,755 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:49,755 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:49,755 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:49,755 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:49,755 INFO L82 PathProgramCache]: Analyzing trace with hash -1125679433, now seen corresponding path program 16 times [2018-10-22 16:00:49,756 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:49,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:49,756 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:49,756 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:49,757 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:49,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:50,081 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:50,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,081 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:50,082 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:50,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:50,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,082 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:50,092 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:50,092 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:50,178 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:50,178 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:50,182 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:50,216 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:50,216 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:50,676 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:50,707 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:50,707 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:50,728 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:00:50,728 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:00:50,933 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:00:50,933 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:50,942 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:50,959 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:50,959 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:51,025 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:51,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:51,028 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 39 [2018-10-22 16:00:51,028 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:51,028 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-22 16:00:51,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-22 16:00:51,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:00:51,029 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand 21 states. [2018-10-22 16:00:51,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:51,910 INFO L93 Difference]: Finished difference Result 186 states and 189 transitions. [2018-10-22 16:00:51,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-22 16:00:51,911 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 117 [2018-10-22 16:00:51,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:51,912 INFO L225 Difference]: With dead ends: 186 [2018-10-22 16:00:51,912 INFO L226 Difference]: Without dead ends: 127 [2018-10-22 16:00:51,914 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 449 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 16:00:51,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-22 16:00:51,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 121. [2018-10-22 16:00:51,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-10-22 16:00:51,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2018-10-22 16:00:51,930 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 117 [2018-10-22 16:00:51,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:51,930 INFO L481 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2018-10-22 16:00:51,930 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-22 16:00:51,930 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2018-10-22 16:00:51,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-10-22 16:00:51,931 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:51,931 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:51,931 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:51,931 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:51,932 INFO L82 PathProgramCache]: Analyzing trace with hash -455930542, now seen corresponding path program 17 times [2018-10-22 16:00:51,932 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:51,932 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:51,933 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:51,933 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:51,933 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:51,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:52,678 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:52,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:52,678 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:52,679 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:52,679 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:52,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:52,679 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:52,686 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:52,687 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:53,020 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-22 16:00:53,020 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:53,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:53,111 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:53,111 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:53,572 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:53,594 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:53,594 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:00:53,609 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:00:53,610 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:00:57,265 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2018-10-22 16:00:57,266 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:57,278 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:57,294 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:57,295 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:00:57,364 INFO L134 CoverageAnalysis]: Checked inductivity of 937 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:57,367 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:00:57,367 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 41 [2018-10-22 16:00:57,367 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:00:57,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 16:00:57,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 16:00:57,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:00:57,369 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand 22 states. [2018-10-22 16:00:57,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:00:57,933 INFO L93 Difference]: Finished difference Result 193 states and 197 transitions. [2018-10-22 16:00:57,933 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-22 16:00:57,934 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 120 [2018-10-22 16:00:57,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:00:57,935 INFO L225 Difference]: With dead ends: 193 [2018-10-22 16:00:57,935 INFO L226 Difference]: Without dead ends: 134 [2018-10-22 16:00:57,936 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 460 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=820, Invalid=820, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 16:00:57,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2018-10-22 16:00:57,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 124. [2018-10-22 16:00:57,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2018-10-22 16:00:57,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2018-10-22 16:00:57,954 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 120 [2018-10-22 16:00:57,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:00:57,954 INFO L481 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2018-10-22 16:00:57,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 16:00:57,954 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2018-10-22 16:00:57,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-10-22 16:00:57,955 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:00:57,955 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:00:57,956 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:00:57,956 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:00:57,956 INFO L82 PathProgramCache]: Analyzing trace with hash 1910191319, now seen corresponding path program 18 times [2018-10-22 16:00:57,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:00:57,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:57,957 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:00:57,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:00:57,957 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:00:57,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:00:58,486 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:58,486 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:58,487 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:00:58,487 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:00:58,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:00:58,487 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:00:58,487 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:00:58,495 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:00:58,496 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:00:59,487 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:00:59,487 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:00:59,492 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:00:59,567 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:00:59,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:00,049 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:00,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:00,071 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:00,087 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:00,087 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:13,480 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-10-22 16:01:13,480 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:13,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:13,507 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:13,507 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:13,532 INFO L134 CoverageAnalysis]: Checked inductivity of 993 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:13,535 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:13,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 43 [2018-10-22 16:01:13,535 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:13,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-22 16:01:13,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-22 16:01:13,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:01:13,538 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand 23 states. [2018-10-22 16:01:13,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:13,810 INFO L93 Difference]: Finished difference Result 200 states and 205 transitions. [2018-10-22 16:01:13,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-22 16:01:13,810 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 123 [2018-10-22 16:01:13,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:13,812 INFO L225 Difference]: With dead ends: 200 [2018-10-22 16:01:13,812 INFO L226 Difference]: Without dead ends: 141 [2018-10-22 16:01:13,813 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 471 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-22 16:01:13,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2018-10-22 16:01:13,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 127. [2018-10-22 16:01:13,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-22 16:01:13,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-10-22 16:01:13,830 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 123 [2018-10-22 16:01:13,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:13,830 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-10-22 16:01:13,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-22 16:01:13,830 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-10-22 16:01:13,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-10-22 16:01:13,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:13,831 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:13,831 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:13,831 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:13,832 INFO L82 PathProgramCache]: Analyzing trace with hash 2043290418, now seen corresponding path program 19 times [2018-10-22 16:01:13,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:13,832 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:13,832 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:13,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:13,833 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:13,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:14,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:14,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:14,593 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:14,593 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:14,593 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:14,593 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:14,593 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:14,601 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:14,601 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:14,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:14,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:14,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:14,736 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:15,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:15,384 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:15,385 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:15,400 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:15,400 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:01:15,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:15,607 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:15,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:15,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:15,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:15,662 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:15,663 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 45 [2018-10-22 16:01:15,663 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:15,663 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 16:01:15,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 16:01:15,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:01:15,665 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 24 states. [2018-10-22 16:01:15,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:15,960 INFO L93 Difference]: Finished difference Result 207 states and 213 transitions. [2018-10-22 16:01:15,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-22 16:01:15,962 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 126 [2018-10-22 16:01:15,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:15,963 INFO L225 Difference]: With dead ends: 207 [2018-10-22 16:01:15,964 INFO L226 Difference]: Without dead ends: 148 [2018-10-22 16:01:15,965 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 525 GetRequests, 482 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 16:01:15,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2018-10-22 16:01:15,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 130. [2018-10-22 16:01:15,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2018-10-22 16:01:15,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2018-10-22 16:01:15,982 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 126 [2018-10-22 16:01:15,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:15,982 INFO L481 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2018-10-22 16:01:15,982 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 16:01:15,982 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2018-10-22 16:01:15,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-10-22 16:01:15,983 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:15,983 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:15,983 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:15,983 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:15,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1351232777, now seen corresponding path program 20 times [2018-10-22 16:01:15,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:15,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:15,984 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:01:15,984 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:15,984 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:16,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:16,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:16,760 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:16,760 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:16,760 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:16,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:16,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:16,761 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:16,769 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:16,770 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:16,878 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:16,878 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:16,882 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:17,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:17,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:17,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:17,677 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:17,678 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:17,693 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:01:17,693 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:17,910 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:01:17,910 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:17,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:17,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:17,937 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:18,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1114 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:18,009 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:18,009 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 47 [2018-10-22 16:01:18,009 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:18,010 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-22 16:01:18,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-22 16:01:18,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:01:18,012 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand 25 states. [2018-10-22 16:01:18,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:18,334 INFO L93 Difference]: Finished difference Result 214 states and 221 transitions. [2018-10-22 16:01:18,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-22 16:01:18,335 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 129 [2018-10-22 16:01:18,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:18,336 INFO L225 Difference]: With dead ends: 214 [2018-10-22 16:01:18,336 INFO L226 Difference]: Without dead ends: 155 [2018-10-22 16:01:18,337 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 493 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1081, Invalid=1081, Unknown=0, NotChecked=0, Total=2162 [2018-10-22 16:01:18,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2018-10-22 16:01:18,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 133. [2018-10-22 16:01:18,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2018-10-22 16:01:18,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2018-10-22 16:01:18,358 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 129 [2018-10-22 16:01:18,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:18,359 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2018-10-22 16:01:18,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-22 16:01:18,359 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2018-10-22 16:01:18,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2018-10-22 16:01:18,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:18,360 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:18,360 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:18,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:18,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1708216594, now seen corresponding path program 21 times [2018-10-22 16:01:18,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:18,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:18,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:18,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:18,361 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:18,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:19,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2018-10-22 16:01:19,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:19,841 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:19,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:19,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:19,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:19,841 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:19,849 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:19,849 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:01:20,319 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-22 16:01:20,320 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:20,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:20,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-22 16:01:20,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:21,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-22 16:01:21,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:21,053 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:21,073 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:01:21,074 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:01:25,542 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-22 16:01:25,543 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:25,554 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:25,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-22 16:01:25,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:25,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2018-10-22 16:01:25,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:25,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 22, 22, 22] total 48 [2018-10-22 16:01:25,640 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:25,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:01:25,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:01:25,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=1300, Unknown=0, NotChecked=0, Total=2256 [2018-10-22 16:01:25,642 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand 28 states. [2018-10-22 16:01:26,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:26,100 INFO L93 Difference]: Finished difference Result 223 states and 231 transitions. [2018-10-22 16:01:26,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:01:26,100 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 132 [2018-10-22 16:01:26,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:26,101 INFO L225 Difference]: With dead ends: 223 [2018-10-22 16:01:26,101 INFO L226 Difference]: Without dead ends: 156 [2018-10-22 16:01:26,102 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 505 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=962, Invalid=1390, Unknown=0, NotChecked=0, Total=2352 [2018-10-22 16:01:26,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2018-10-22 16:01:26,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 154. [2018-10-22 16:01:26,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2018-10-22 16:01:26,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2018-10-22 16:01:26,129 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 132 [2018-10-22 16:01:26,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:26,129 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2018-10-22 16:01:26,129 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:01:26,129 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2018-10-22 16:01:26,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2018-10-22 16:01:26,130 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:26,130 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:26,130 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:26,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:26,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1193714665, now seen corresponding path program 22 times [2018-10-22 16:01:26,131 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:26,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:26,131 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:26,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:26,131 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:26,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:26,956 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:26,956 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:26,957 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:26,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:26,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:26,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:26,957 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:26,964 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:26,964 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:27,076 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:27,076 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:27,080 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:27,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:27,113 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:28,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:28,057 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:28,058 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:28,073 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:01:28,073 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:01:28,327 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:01:28,327 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:28,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:28,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:28,361 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:28,420 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:28,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:28,422 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 51 [2018-10-22 16:01:28,423 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:28,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-22 16:01:28,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-22 16:01:28,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:01:28,424 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand 27 states. [2018-10-22 16:01:28,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:28,709 INFO L93 Difference]: Finished difference Result 240 states and 243 transitions. [2018-10-22 16:01:28,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-22 16:01:28,710 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 153 [2018-10-22 16:01:28,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:28,711 INFO L225 Difference]: With dead ends: 240 [2018-10-22 16:01:28,711 INFO L226 Difference]: Without dead ends: 163 [2018-10-22 16:01:28,713 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 587 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-22 16:01:28,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-10-22 16:01:28,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2018-10-22 16:01:28,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-22 16:01:28,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-10-22 16:01:28,736 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 153 [2018-10-22 16:01:28,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:28,736 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-10-22 16:01:28,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-22 16:01:28,736 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-10-22 16:01:28,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-10-22 16:01:28,737 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:28,737 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:28,738 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:28,738 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:28,738 INFO L82 PathProgramCache]: Analyzing trace with hash -2060256974, now seen corresponding path program 23 times [2018-10-22 16:01:28,738 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:28,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:28,739 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:28,739 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:28,739 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:28,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:30,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:30,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:30,249 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:30,250 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:30,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:30,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:30,250 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:30,259 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:30,259 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:30,897 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-10-22 16:01:30,898 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:30,903 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:30,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:30,931 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:31,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:31,646 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:31,646 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:31,663 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:01:31,663 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:01:44,290 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2018-10-22 16:01:44,290 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:44,317 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:44,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:44,332 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:44,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:44,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:01:44,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 53 [2018-10-22 16:01:44,410 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:01:44,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-22 16:01:44,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-22 16:01:44,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:01:44,412 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 28 states. [2018-10-22 16:01:45,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:01:45,045 INFO L93 Difference]: Finished difference Result 247 states and 251 transitions. [2018-10-22 16:01:45,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-22 16:01:45,045 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 156 [2018-10-22 16:01:45,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:01:45,047 INFO L225 Difference]: With dead ends: 247 [2018-10-22 16:01:45,047 INFO L226 Difference]: Without dead ends: 170 [2018-10-22 16:01:45,048 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 598 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-10-22 16:01:45,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2018-10-22 16:01:45,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 160. [2018-10-22 16:01:45,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-10-22 16:01:45,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2018-10-22 16:01:45,086 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 156 [2018-10-22 16:01:45,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:01:45,087 INFO L481 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2018-10-22 16:01:45,087 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-22 16:01:45,087 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2018-10-22 16:01:45,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-10-22 16:01:45,089 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:01:45,089 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:01:45,089 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:01:45,089 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:01:45,090 INFO L82 PathProgramCache]: Analyzing trace with hash -173768137, now seen corresponding path program 24 times [2018-10-22 16:01:45,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:01:45,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:45,091 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:01:45,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:01:45,091 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:01:45,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:01:46,581 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:46,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:46,582 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:01:46,582 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:01:46,582 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:01:46,582 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:46,582 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:01:46,589 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:46,589 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:01:51,686 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2018-10-22 16:01:51,687 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:01:51,696 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:01:51,744 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:51,745 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:01:52,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:01:52,626 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:01:52,626 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:01:52,641 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:01:52,642 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:03:08,979 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 26 check-sat command(s) [2018-10-22 16:03:08,979 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:08,995 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:09,014 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:09,015 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:09,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1755 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:09,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:09,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 55 [2018-10-22 16:03:09,041 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:09,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-22 16:03:09,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-22 16:03:09,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:03:09,042 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand 29 states. [2018-10-22 16:03:09,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:09,372 INFO L93 Difference]: Finished difference Result 254 states and 259 transitions. [2018-10-22 16:03:09,372 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-22 16:03:09,373 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 159 [2018-10-22 16:03:09,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:09,374 INFO L225 Difference]: With dead ends: 254 [2018-10-22 16:03:09,374 INFO L226 Difference]: Without dead ends: 177 [2018-10-22 16:03:09,375 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 662 GetRequests, 609 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-22 16:03:09,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-22 16:03:09,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 163. [2018-10-22 16:03:09,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2018-10-22 16:03:09,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2018-10-22 16:03:09,403 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 159 [2018-10-22 16:03:09,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:09,404 INFO L481 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2018-10-22 16:03:09,404 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-22 16:03:09,404 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2018-10-22 16:03:09,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2018-10-22 16:03:09,405 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:09,405 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:09,405 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:09,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:09,405 INFO L82 PathProgramCache]: Analyzing trace with hash 568106770, now seen corresponding path program 25 times [2018-10-22 16:03:09,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:09,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:09,406 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:09,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:09,406 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:09,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:10,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:10,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:10,467 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:10,467 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:10,468 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:10,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:10,468 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:10,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:10,483 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:03:10,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:10,587 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:10,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:10,621 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:11,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:11,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:11,692 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:11,707 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:11,707 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 16:03:11,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:11,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:11,991 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:11,992 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:12,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:12,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:12,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 57 [2018-10-22 16:03:12,026 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:12,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-22 16:03:12,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-22 16:03:12,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:03:12,029 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand 30 states. [2018-10-22 16:03:12,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:12,485 INFO L93 Difference]: Finished difference Result 261 states and 267 transitions. [2018-10-22 16:03:12,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-22 16:03:12,486 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 162 [2018-10-22 16:03:12,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:12,487 INFO L225 Difference]: With dead ends: 261 [2018-10-22 16:03:12,487 INFO L226 Difference]: Without dead ends: 184 [2018-10-22 16:03:12,488 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 620 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-22 16:03:12,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2018-10-22 16:03:12,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 166. [2018-10-22 16:03:12,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-10-22 16:03:12,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2018-10-22 16:03:12,521 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 162 [2018-10-22 16:03:12,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:12,522 INFO L481 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2018-10-22 16:03:12,522 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-22 16:03:12,522 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2018-10-22 16:03:12,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-22 16:03:12,523 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:12,523 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:12,523 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:12,523 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:12,523 INFO L82 PathProgramCache]: Analyzing trace with hash -138244009, now seen corresponding path program 26 times [2018-10-22 16:03:12,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:12,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:12,524 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 16:03:12,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:12,524 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:12,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:13,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:13,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:13,163 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:13,163 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:13,163 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:13,163 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:13,163 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:13,172 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:03:13,172 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:13,289 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:03:13,290 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:13,293 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:13,321 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:13,321 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:15,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:15,053 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:15,053 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:15,069 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 16:03:15,069 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:15,339 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 16:03:15,339 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:15,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:15,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:15,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:15,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:15,400 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:15,400 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 59 [2018-10-22 16:03:15,401 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:15,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-22 16:03:15,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-22 16:03:15,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:03:15,402 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand 31 states. [2018-10-22 16:03:15,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:15,817 INFO L93 Difference]: Finished difference Result 268 states and 275 transitions. [2018-10-22 16:03:15,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-22 16:03:15,818 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 165 [2018-10-22 16:03:15,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:15,819 INFO L225 Difference]: With dead ends: 268 [2018-10-22 16:03:15,819 INFO L226 Difference]: Without dead ends: 191 [2018-10-22 16:03:15,820 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1711, Invalid=1711, Unknown=0, NotChecked=0, Total=3422 [2018-10-22 16:03:15,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2018-10-22 16:03:15,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 169. [2018-10-22 16:03:15,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-22 16:03:15,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-22 16:03:15,847 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 165 [2018-10-22 16:03:15,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:15,847 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-22 16:03:15,847 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-22 16:03:15,847 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-22 16:03:15,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2018-10-22 16:03:15,848 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:15,848 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:15,848 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:15,848 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:15,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1989518094, now seen corresponding path program 27 times [2018-10-22 16:03:15,848 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:15,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:15,849 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:15,849 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:15,849 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:15,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:16,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1995 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 805 trivial. 0 not checked. [2018-10-22 16:03:16,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:16,467 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:16,467 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:16,467 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:16,467 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:16,467 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:16,476 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:03:16,476 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:17,450 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-22 16:03:17,451 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:17,456 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:17,523 INFO L134 CoverageAnalysis]: Checked inductivity of 1995 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-22 16:03:17,524 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:18,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1995 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-22 16:03:18,333 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:18,333 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:18,348 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 16:03:18,348 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 16:03:35,196 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-22 16:03:35,196 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:35,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:35,243 INFO L134 CoverageAnalysis]: Checked inductivity of 1995 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-22 16:03:35,243 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:35,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1995 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2018-10-22 16:03:35,272 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:35,272 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 28, 28, 28, 28] total 60 [2018-10-22 16:03:35,273 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:35,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:03:35,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:03:35,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1550, Invalid=1990, Unknown=0, NotChecked=0, Total=3540 [2018-10-22 16:03:35,274 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 34 states. [2018-10-22 16:03:35,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:35,833 INFO L93 Difference]: Finished difference Result 277 states and 285 transitions. [2018-10-22 16:03:35,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:03:35,833 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 168 [2018-10-22 16:03:35,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:35,834 INFO L225 Difference]: With dead ends: 277 [2018-10-22 16:03:35,835 INFO L226 Difference]: Without dead ends: 192 [2018-10-22 16:03:35,836 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 643 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1556, Invalid=2104, Unknown=0, NotChecked=0, Total=3660 [2018-10-22 16:03:35,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2018-10-22 16:03:35,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2018-10-22 16:03:35,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-10-22 16:03:35,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 191 transitions. [2018-10-22 16:03:35,877 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 191 transitions. Word has length 168 [2018-10-22 16:03:35,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:35,877 INFO L481 AbstractCegarLoop]: Abstraction has 190 states and 191 transitions. [2018-10-22 16:03:35,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:03:35,877 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 191 transitions. [2018-10-22 16:03:35,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-10-22 16:03:35,878 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:35,878 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:35,878 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:35,878 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:35,879 INFO L82 PathProgramCache]: Analyzing trace with hash 1030287735, now seen corresponding path program 28 times [2018-10-22 16:03:35,879 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:35,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:35,879 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:35,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:35,879 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:35,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:36,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:03:36,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:36,462 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:36,462 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:36,462 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:36,462 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:36,462 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:36,469 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:36,469 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:36,607 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:36,608 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:36,611 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:36,643 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:03:36,643 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:37,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:03:37,685 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:37,685 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:37,700 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 16:03:37,700 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 16:03:38,032 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 16:03:38,032 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:38,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:38,074 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:03:38,074 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:38,160 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:03:38,165 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:03:38,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 63 [2018-10-22 16:03:38,165 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:03:38,166 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-22 16:03:38,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-22 16:03:38,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:03:38,167 INFO L87 Difference]: Start difference. First operand 190 states and 191 transitions. Second operand 33 states. [2018-10-22 16:03:38,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:03:38,793 INFO L93 Difference]: Finished difference Result 294 states and 297 transitions. [2018-10-22 16:03:38,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-22 16:03:38,793 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 189 [2018-10-22 16:03:38,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:03:38,794 INFO L225 Difference]: With dead ends: 294 [2018-10-22 16:03:38,794 INFO L226 Difference]: Without dead ends: 199 [2018-10-22 16:03:38,795 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 786 GetRequests, 725 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-22 16:03:38,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-22 16:03:38,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 193. [2018-10-22 16:03:38,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2018-10-22 16:03:38,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 194 transitions. [2018-10-22 16:03:38,831 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 194 transitions. Word has length 189 [2018-10-22 16:03:38,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:03:38,831 INFO L481 AbstractCegarLoop]: Abstraction has 193 states and 194 transitions. [2018-10-22 16:03:38,832 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-22 16:03:38,832 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 194 transitions. [2018-10-22 16:03:38,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2018-10-22 16:03:38,833 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:03:38,833 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:03:38,833 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:03:38,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:03:38,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1867817710, now seen corresponding path program 29 times [2018-10-22 16:03:38,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:03:38,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:38,834 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:03:38,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:03:38,834 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:03:38,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:03:39,398 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:03:39,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:39,399 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:03:39,399 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:03:39,399 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:03:39,399 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:39,399 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:03:39,408 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:03:39,408 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:03:40,739 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-10-22 16:03:40,739 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:03:40,747 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:03:40,777 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:03:40,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:03:41,847 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:03:41,871 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:03:41,871 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:03:41,886 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 16:03:41,886 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 16:04:00,868 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 31 check-sat command(s) [2018-10-22 16:04:00,868 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:00,889 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:00,919 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:04:00,919 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:00,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2641 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:04:00,948 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 16:04:00,949 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 65 [2018-10-22 16:04:00,949 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 16:04:00,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-22 16:04:00,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-22 16:04:00,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:04:00,950 INFO L87 Difference]: Start difference. First operand 193 states and 194 transitions. Second operand 34 states. [2018-10-22 16:04:01,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 16:04:01,385 INFO L93 Difference]: Finished difference Result 301 states and 305 transitions. [2018-10-22 16:04:01,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-22 16:04:01,385 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 192 [2018-10-22 16:04:01,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 16:04:01,386 INFO L225 Difference]: With dead ends: 301 [2018-10-22 16:04:01,386 INFO L226 Difference]: Without dead ends: 206 [2018-10-22 16:04:01,387 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 799 GetRequests, 736 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2080, Invalid=2080, Unknown=0, NotChecked=0, Total=4160 [2018-10-22 16:04:01,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-10-22 16:04:01,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 196. [2018-10-22 16:04:01,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2018-10-22 16:04:01,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 197 transitions. [2018-10-22 16:04:01,423 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 197 transitions. Word has length 192 [2018-10-22 16:04:01,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 16:04:01,424 INFO L481 AbstractCegarLoop]: Abstraction has 196 states and 197 transitions. [2018-10-22 16:04:01,424 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-22 16:04:01,424 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 197 transitions. [2018-10-22 16:04:01,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-22 16:04:01,425 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 16:04:01,425 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 16:04:01,425 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 16:04:01,425 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 16:04:01,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1894545513, now seen corresponding path program 30 times [2018-10-22 16:04:01,425 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 16:04:01,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:01,426 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 16:04:01,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 16:04:01,426 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 16:04:01,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 16:04:02,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2733 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:04:02,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:02,318 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 16:04:02,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 16:04:02,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 16:04:02,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:02,318 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 16:04:02,326 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:04:02,327 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 16:04:29,695 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 32 check-sat command(s) [2018-10-22 16:04:29,695 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 16:04:29,710 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 16:04:29,742 INFO L134 CoverageAnalysis]: Checked inductivity of 2733 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:04:29,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 16:04:30,841 INFO L134 CoverageAnalysis]: Checked inductivity of 2733 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2018-10-22 16:04:30,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 16:04:30,866 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 16:04:30,880 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 16:04:30,881 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown