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-EXP.epf -i ../../../trunk/examples/svcomp/loop-invgen/down_true-unreach-call_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-d380424 [2018-10-24 12:33:59,213 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-24 12:33:59,215 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-24 12:33:59,227 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-24 12:33:59,227 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-24 12:33:59,228 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-24 12:33:59,230 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-24 12:33:59,231 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-24 12:33:59,233 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-24 12:33:59,234 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-24 12:33:59,235 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-24 12:33:59,235 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-24 12:33:59,236 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-24 12:33:59,237 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-24 12:33:59,238 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-24 12:33:59,239 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-24 12:33:59,240 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-24 12:33:59,243 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-24 12:33:59,251 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-24 12:33:59,252 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-24 12:33:59,257 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-24 12:33:59,258 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-24 12:33:59,262 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-24 12:33:59,262 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-24 12:33:59,262 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-24 12:33:59,263 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-24 12:33:59,267 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-24 12:33:59,268 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-24 12:33:59,269 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-24 12:33:59,270 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-24 12:33:59,272 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-24 12:33:59,273 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-24 12:33:59,276 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-24 12:33:59,303 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-24 12:33:59,303 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-24 12:33:59,304 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-24 12:33:59,304 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-24 12:33:59,304 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-24 12:33:59,304 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-24 12:33:59,305 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-24 12:33:59,307 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-24 12:33:59,307 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-24 12:33:59,307 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-24 12:33:59,308 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-24 12:33:59,308 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-24 12:33:59,308 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-24 12:33:59,308 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-24 12:33:59,309 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-24 12:33:59,309 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-24 12:33:59,309 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-24 12:33:59,310 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-24 12:33:59,310 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-24 12:33:59,310 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-24 12:33:59,310 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-24 12:33:59,310 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-24 12:33:59,311 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-24 12:33:59,311 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-24 12:33:59,311 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-24 12:33:59,311 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-24 12:33:59,311 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-24 12:33:59,312 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-24 12:33:59,313 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-24 12:33:59,313 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-24 12:33:59,314 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-24 12:33:59,314 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-24 12:33:59,314 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-24 12:33:59,314 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-24 12:33:59,314 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-24 12:33:59,314 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-24 12:33:59,375 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-24 12:33:59,389 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-24 12:33:59,393 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-24 12:33:59,395 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-24 12:33:59,395 INFO L276 PluginConnector]: CDTParser initialized [2018-10-24 12:33:59,396 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-invgen/down_true-unreach-call_true-termination.i [2018-10-24 12:33:59,458 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4a71d7967/790771832c964ff6aed81360d5f4188a/FLAG865720c5d [2018-10-24 12:33:59,927 INFO L298 CDTParser]: Found 1 translation units. [2018-10-24 12:33:59,928 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/down_true-unreach-call_true-termination.i [2018-10-24 12:33:59,934 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4a71d7967/790771832c964ff6aed81360d5f4188a/FLAG865720c5d [2018-10-24 12:33:59,947 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/4a71d7967/790771832c964ff6aed81360d5f4188a [2018-10-24 12:33:59,958 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-24 12:33:59,959 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-24 12:33:59,960 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-24 12:33:59,960 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-24 12:33:59,965 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-24 12:33:59,966 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:33:59" (1/1) ... [2018-10-24 12:33:59,969 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6c54db9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:33:59, skipping insertion in model container [2018-10-24 12:33:59,969 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 12:33:59" (1/1) ... [2018-10-24 12:33:59,980 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-24 12:34:00,004 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-24 12:34:00,179 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:00,183 INFO L189 MainTranslator]: Completed pre-run [2018-10-24 12:34:00,200 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-24 12:34:00,217 INFO L193 MainTranslator]: Completed translation [2018-10-24 12:34:00,218 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00 WrapperNode [2018-10-24 12:34:00,218 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-24 12:34:00,218 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:00,219 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-24 12:34:00,219 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-24 12:34:00,228 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,233 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,239 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-24 12:34:00,240 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-24 12:34:00,240 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-24 12:34:00,240 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-24 12:34:00,249 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,250 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,250 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,251 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,254 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,259 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,260 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (1/1) ... [2018-10-24 12:34:00,261 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-24 12:34:00,261 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-24 12:34:00,262 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-24 12:34:00,262 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-24 12:34:00,262 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (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 [2018-10-24 12:34:00,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-24 12:34:00,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-24 12:34:00,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-24 12:34:00,321 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-24 12:34:00,321 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-24 12:34:00,321 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-24 12:34:00,321 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-24 12:34:00,321 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-24 12:34:00,636 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-24 12:34:00,636 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:00 BoogieIcfgContainer [2018-10-24 12:34:00,637 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-24 12:34:00,637 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-24 12:34:00,638 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-24 12:34:00,641 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-24 12:34:00,641 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 12:33:59" (1/3) ... [2018-10-24 12:34:00,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@998cb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:00, skipping insertion in model container [2018-10-24 12:34:00,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 12:34:00" (2/3) ... [2018-10-24 12:34:00,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@998cb4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 12:34:00, skipping insertion in model container [2018-10-24 12:34:00,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 12:34:00" (3/3) ... [2018-10-24 12:34:00,644 INFO L112 eAbstractionObserver]: Analyzing ICFG down_true-unreach-call_true-termination.i [2018-10-24 12:34:00,652 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-24 12:34:00,659 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-24 12:34:00,671 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-24 12:34:00,704 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-24 12:34:00,704 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-24 12:34:00,704 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-24 12:34:00,705 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-24 12:34:00,705 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-24 12:34:00,705 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-24 12:34:00,705 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-24 12:34:00,705 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-24 12:34:00,723 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-10-24 12:34:00,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-24 12:34:00,729 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:00,730 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:00,733 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:00,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:00,739 INFO L82 PathProgramCache]: Analyzing trace with hash 123585964, now seen corresponding path program 1 times [2018-10-24 12:34:00,741 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:00,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:00,793 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:00,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:00,793 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:00,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:00,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:00,852 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:00,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-24 12:34:00,852 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:00,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-24 12:34:00,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-24 12:34:00,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-24 12:34:00,870 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-10-24 12:34:00,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:00,891 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2018-10-24 12:34:00,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-24 12:34:00,894 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-24 12:34:00,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:00,902 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:34:00,902 INFO L226 Difference]: Without dead ends: 18 [2018-10-24 12:34:00,906 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 [2018-10-24 12:34:00,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-24 12:34:00,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-24 12:34:00,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-24 12:34:00,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-24 12:34:00,948 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-24 12:34:00,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:00,949 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-24 12:34:00,949 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-24 12:34:00,949 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-24 12:34:00,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-10-24 12:34:00,950 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:00,950 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:00,950 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:00,955 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:00,956 INFO L82 PathProgramCache]: Analyzing trace with hash -203615370, now seen corresponding path program 1 times [2018-10-24 12:34:00,956 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:00,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:00,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:00,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:00,958 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:00,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:01,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:01,239 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:01,240 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-24 12:34:01,240 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:01,241 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-24 12:34:01,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-24 12:34:01,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-24 12:34:01,242 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2018-10-24 12:34:01,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:01,431 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2018-10-24 12:34:01,431 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-24 12:34:01,431 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2018-10-24 12:34:01,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:01,432 INFO L225 Difference]: With dead ends: 33 [2018-10-24 12:34:01,432 INFO L226 Difference]: Without dead ends: 20 [2018-10-24 12:34:01,434 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:34:01,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-24 12:34:01,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-24 12:34:01,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-24 12:34:01,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2018-10-24 12:34:01,440 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2018-10-24 12:34:01,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:01,440 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2018-10-24 12:34:01,440 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-24 12:34:01,441 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2018-10-24 12:34:01,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-24 12:34:01,441 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:01,442 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:01,442 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:01,442 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:01,443 INFO L82 PathProgramCache]: Analyzing trace with hash 1025157488, now seen corresponding path program 1 times [2018-10-24 12:34:01,443 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:01,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:01,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:01,444 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:01,444 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:01,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:01,572 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:01,573 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-24 12:34:01,573 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-10-24 12:34:01,573 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-24 12:34:01,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-24 12:34:01,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-24 12:34:01,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-10-24 12:34:01,574 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 6 states. [2018-10-24 12:34:01,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:01,774 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2018-10-24 12:34:01,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-24 12:34:01,775 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2018-10-24 12:34:01,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:01,777 INFO L225 Difference]: With dead ends: 34 [2018-10-24 12:34:01,777 INFO L226 Difference]: Without dead ends: 32 [2018-10-24 12:34:01,778 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:34:01,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-24 12:34:01,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2018-10-24 12:34:01,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-24 12:34:01,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-24 12:34:01,789 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 16 [2018-10-24 12:34:01,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:01,790 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-24 12:34:01,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-24 12:34:01,790 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-24 12:34:01,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-24 12:34:01,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:01,791 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:01,791 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:01,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:01,792 INFO L82 PathProgramCache]: Analyzing trace with hash -1392733261, now seen corresponding path program 1 times [2018-10-24 12:34:01,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:01,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:01,793 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:01,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:01,794 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:01,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:01,947 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:01,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:01,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:01,948 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 25 with the following transitions: [2018-10-24 12:34:01,950 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [18], [22], [28], [30], [36], [39], [41], [44], [46], [47], [48], [49], [51], [52] [2018-10-24 12:34:01,980 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-24 12:34:01,981 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-24 12:34:02,204 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-24 12:34:02,205 INFO L272 AbstractInterpreter]: Visited 19 different actions 69 times. Merged at 8 different actions 24 times. Widened at 1 different actions 2 times. Found 4 fixpoints after 3 different actions. Largest state had 9 variables. [2018-10-24 12:34:02,216 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:02,217 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-24 12:34:02,218 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:02,218 INFO L194 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 [2018-10-24 12:34:02,227 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:02,228 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:02,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:02,271 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:02,304 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:02,304 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:02,437 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:02,459 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:02,460 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 7 [2018-10-24 12:34:02,460 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:02,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-24 12:34:02,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-24 12:34:02,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-24 12:34:02,462 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 7 states. [2018-10-24 12:34:02,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:02,702 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2018-10-24 12:34:02,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-24 12:34:02,703 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2018-10-24 12:34:02,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:02,705 INFO L225 Difference]: With dead ends: 46 [2018-10-24 12:34:02,705 INFO L226 Difference]: Without dead ends: 29 [2018-10-24 12:34:02,707 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 45 SyntacticMatches, 4 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:34:02,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-10-24 12:34:02,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-10-24 12:34:02,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-24 12:34:02,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-24 12:34:02,714 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 24 [2018-10-24 12:34:02,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:02,714 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-24 12:34:02,714 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-24 12:34:02,715 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-24 12:34:02,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-10-24 12:34:02,716 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:02,716 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:02,716 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:02,716 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:02,717 INFO L82 PathProgramCache]: Analyzing trace with hash -782599891, now seen corresponding path program 2 times [2018-10-24 12:34:02,717 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:02,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:02,718 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:02,718 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:02,718 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:02,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:02,845 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:02,845 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:02,845 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:02,846 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:02,846 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:02,846 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:02,846 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:02,863 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:02,863 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:02,909 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-24 12:34:02,910 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:02,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:03,012 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:03,013 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:03,094 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-24 12:34:03,115 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:03,115 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 10 [2018-10-24 12:34:03,115 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:03,116 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-24 12:34:03,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-24 12:34:03,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2018-10-24 12:34:03,117 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2018-10-24 12:34:03,443 WARN L179 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 7 DAG size of output: 6 [2018-10-24 12:34:03,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:03,521 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2018-10-24 12:34:03,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:34:03,524 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2018-10-24 12:34:03,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:03,526 INFO L225 Difference]: With dead ends: 39 [2018-10-24 12:34:03,526 INFO L226 Difference]: Without dead ends: 37 [2018-10-24 12:34:03,528 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:34:03,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-24 12:34:03,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-24 12:34:03,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-24 12:34:03,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2018-10-24 12:34:03,536 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 26 [2018-10-24 12:34:03,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:03,537 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2018-10-24 12:34:03,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-24 12:34:03,538 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2018-10-24 12:34:03,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-10-24 12:34:03,538 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:03,539 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:03,539 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:03,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:03,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1585665648, now seen corresponding path program 3 times [2018-10-24 12:34:03,540 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:03,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:03,541 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:03,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:03,541 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:03,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:03,672 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:03,672 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:03,672 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:03,672 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:03,673 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:03,673 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:03,673 INFO L194 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 [2018-10-24 12:34:03,687 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:03,687 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:03,703 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:03,703 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:03,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:03,725 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:03,726 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:03,834 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:03,864 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:03,864 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 9 [2018-10-24 12:34:03,864 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:03,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-24 12:34:03,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-24 12:34:03,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-10-24 12:34:03,866 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 9 states. [2018-10-24 12:34:04,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:04,083 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2018-10-24 12:34:04,084 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-24 12:34:04,084 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2018-10-24 12:34:04,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:04,085 INFO L225 Difference]: With dead ends: 60 [2018-10-24 12:34:04,085 INFO L226 Difference]: Without dead ends: 39 [2018-10-24 12:34:04,086 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:04,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-24 12:34:04,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-10-24 12:34:04,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-10-24 12:34:04,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2018-10-24 12:34:04,093 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2018-10-24 12:34:04,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:04,093 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2018-10-24 12:34:04,093 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-24 12:34:04,094 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2018-10-24 12:34:04,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-24 12:34:04,095 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:04,095 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:04,095 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:04,095 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:04,096 INFO L82 PathProgramCache]: Analyzing trace with hash -75224214, now seen corresponding path program 4 times [2018-10-24 12:34:04,096 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:04,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:04,097 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:04,097 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:04,097 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:04,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:04,355 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 15 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-24 12:34:04,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:04,356 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:04,356 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:04,356 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:04,356 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:04,356 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:04,363 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:04,364 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:04,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:04,383 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:04,448 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:04,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:04,541 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-10-24 12:34:04,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:04,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 11 [2018-10-24 12:34:04,563 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:04,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:34:04,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:34:04,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:34:04,565 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 11 states. [2018-10-24 12:34:04,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:04,753 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2018-10-24 12:34:04,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-24 12:34:04,753 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2018-10-24 12:34:04,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:04,754 INFO L225 Difference]: With dead ends: 49 [2018-10-24 12:34:04,755 INFO L226 Difference]: Without dead ends: 47 [2018-10-24 12:34:04,756 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:04,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-10-24 12:34:04,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-10-24 12:34:04,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-10-24 12:34:04,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2018-10-24 12:34:04,763 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 36 [2018-10-24 12:34:04,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:04,764 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2018-10-24 12:34:04,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:34:04,764 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2018-10-24 12:34:04,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-10-24 12:34:04,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:04,766 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:04,766 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:04,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:04,766 INFO L82 PathProgramCache]: Analyzing trace with hash 959019949, now seen corresponding path program 5 times [2018-10-24 12:34:04,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:04,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:04,767 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:04,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:04,768 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:04,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:04,880 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:04,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:04,881 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:04,881 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:04,881 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:04,881 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:04,881 INFO L194 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 [2018-10-24 12:34:04,892 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:04,892 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:04,917 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-24 12:34:04,918 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:04,921 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:04,932 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:04,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:05,025 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:05,046 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:05,047 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 11 [2018-10-24 12:34:05,047 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:05,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-24 12:34:05,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-24 12:34:05,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-10-24 12:34:05,048 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 11 states. [2018-10-24 12:34:05,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:05,206 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2018-10-24 12:34:05,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:34:05,208 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 44 [2018-10-24 12:34:05,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:05,209 INFO L225 Difference]: With dead ends: 74 [2018-10-24 12:34:05,210 INFO L226 Difference]: Without dead ends: 49 [2018-10-24 12:34:05,210 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:34:05,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-10-24 12:34:05,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-10-24 12:34:05,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-24 12:34:05,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2018-10-24 12:34:05,218 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2018-10-24 12:34:05,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:05,219 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2018-10-24 12:34:05,219 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-24 12:34:05,219 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2018-10-24 12:34:05,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-10-24 12:34:05,220 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:05,221 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:05,225 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:05,225 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:05,225 INFO L82 PathProgramCache]: Analyzing trace with hash 1636294695, now seen corresponding path program 6 times [2018-10-24 12:34:05,225 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:05,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:05,226 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:05,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:05,227 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:05,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:05,402 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 25 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-24 12:34:05,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:05,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:05,403 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:05,403 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:05,403 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:05,403 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:05,410 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:05,411 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:05,436 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:05,436 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:05,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:05,506 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:05,506 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:05,617 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 26 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-24 12:34:05,637 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:05,637 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 12 [2018-10-24 12:34:05,637 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:05,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-24 12:34:05,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-24 12:34:05,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2018-10-24 12:34:05,638 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 12 states. [2018-10-24 12:34:05,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:05,890 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2018-10-24 12:34:05,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-24 12:34:05,890 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2018-10-24 12:34:05,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:05,892 INFO L225 Difference]: With dead ends: 59 [2018-10-24 12:34:05,892 INFO L226 Difference]: Without dead ends: 57 [2018-10-24 12:34:05,893 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 87 SyntacticMatches, 9 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:34:05,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-10-24 12:34:05,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-10-24 12:34:05,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-10-24 12:34:05,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2018-10-24 12:34:05,900 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 46 [2018-10-24 12:34:05,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:05,901 INFO L481 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2018-10-24 12:34:05,901 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-24 12:34:05,901 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2018-10-24 12:34:05,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-10-24 12:34:05,902 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:05,903 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:05,903 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:05,903 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:05,903 INFO L82 PathProgramCache]: Analyzing trace with hash -2134957206, now seen corresponding path program 7 times [2018-10-24 12:34:05,903 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:05,904 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:05,904 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:05,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:05,905 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:05,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:06,041 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:06,041 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:06,041 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:06,041 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:06,041 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:06,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:06,042 INFO L194 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 [2018-10-24 12:34:06,049 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:06,050 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:06,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:06,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:06,082 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:06,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:06,207 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:06,228 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:06,228 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 13 [2018-10-24 12:34:06,228 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:06,229 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:34:06,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:34:06,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:06,230 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 13 states. [2018-10-24 12:34:06,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:06,394 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2018-10-24 12:34:06,396 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:34:06,396 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2018-10-24 12:34:06,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:06,397 INFO L225 Difference]: With dead ends: 88 [2018-10-24 12:34:06,398 INFO L226 Difference]: Without dead ends: 59 [2018-10-24 12:34:06,398 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 99 SyntacticMatches, 10 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=97, Invalid=245, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:06,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-10-24 12:34:06,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2018-10-24 12:34:06,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-10-24 12:34:06,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2018-10-24 12:34:06,406 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2018-10-24 12:34:06,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:06,407 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2018-10-24 12:34:06,407 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:34:06,407 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2018-10-24 12:34:06,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-10-24 12:34:06,408 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:06,408 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:06,408 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:06,409 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:06,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1771194524, now seen corresponding path program 8 times [2018-10-24 12:34:06,409 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:06,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:06,410 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:06,410 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:06,410 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:06,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:06,544 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-24 12:34:06,544 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:06,544 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:06,545 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:06,545 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:06,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:06,545 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:06,555 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:06,555 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:06,621 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-24 12:34:06,622 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:06,626 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:06,690 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:06,690 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:06,806 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 38 proven. 36 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2018-10-24 12:34:06,826 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:06,827 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 13 [2018-10-24 12:34:06,827 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:06,827 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-24 12:34:06,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-24 12:34:06,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2018-10-24 12:34:06,828 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand 13 states. [2018-10-24 12:34:06,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:06,972 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2018-10-24 12:34:06,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-24 12:34:06,973 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2018-10-24 12:34:06,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:06,975 INFO L225 Difference]: With dead ends: 69 [2018-10-24 12:34:06,975 INFO L226 Difference]: Without dead ends: 67 [2018-10-24 12:34:06,976 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 106 SyntacticMatches, 11 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:34:06,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-10-24 12:34:06,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2018-10-24 12:34:06,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-10-24 12:34:06,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2018-10-24 12:34:06,984 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 56 [2018-10-24 12:34:06,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:06,984 INFO L481 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2018-10-24 12:34:06,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-24 12:34:06,984 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2018-10-24 12:34:06,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2018-10-24 12:34:06,985 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:06,986 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:06,986 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:06,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:06,986 INFO L82 PathProgramCache]: Analyzing trace with hash -835949145, now seen corresponding path program 9 times [2018-10-24 12:34:06,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:06,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:06,987 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:06,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:06,988 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:06,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:07,263 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:07,263 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:07,263 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:07,264 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:07,264 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:07,264 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:07,264 INFO L194 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 [2018-10-24 12:34:07,273 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:07,274 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:07,321 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:07,321 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:07,325 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:07,342 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:07,342 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:07,977 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 65 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:07,997 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:07,997 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 15 [2018-10-24 12:34:07,997 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:07,998 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:34:07,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:34:07,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:34:07,998 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand 15 states. [2018-10-24 12:34:08,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:08,320 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2018-10-24 12:34:08,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:34:08,321 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 64 [2018-10-24 12:34:08,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:08,322 INFO L225 Difference]: With dead ends: 102 [2018-10-24 12:34:08,323 INFO L226 Difference]: Without dead ends: 69 [2018-10-24 12:34:08,323 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 117 SyntacticMatches, 12 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=127, Invalid=335, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:34:08,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-10-24 12:34:08,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-10-24 12:34:08,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-10-24 12:34:08,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2018-10-24 12:34:08,331 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 64 [2018-10-24 12:34:08,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:08,332 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2018-10-24 12:34:08,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:34:08,332 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2018-10-24 12:34:08,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2018-10-24 12:34:08,333 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:08,333 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:08,333 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:08,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:08,334 INFO L82 PathProgramCache]: Analyzing trace with hash -598355679, now seen corresponding path program 10 times [2018-10-24 12:34:08,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:08,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:08,335 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:08,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:08,335 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:08,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:08,465 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 51 proven. 68 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-10-24 12:34:08,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:08,465 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:08,465 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:08,465 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:08,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:08,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:08,476 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:08,476 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:08,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:08,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:08,631 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:08,631 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:08,751 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 52 proven. 55 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-10-24 12:34:08,773 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:08,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 14 [2018-10-24 12:34:08,773 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:08,773 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-24 12:34:08,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-24 12:34:08,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2018-10-24 12:34:08,774 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 14 states. [2018-10-24 12:34:08,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:08,959 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2018-10-24 12:34:08,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-24 12:34:08,959 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2018-10-24 12:34:08,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:08,961 INFO L225 Difference]: With dead ends: 79 [2018-10-24 12:34:08,961 INFO L226 Difference]: Without dead ends: 77 [2018-10-24 12:34:08,962 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 125 SyntacticMatches, 13 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:34:08,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-10-24 12:34:08,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2018-10-24 12:34:08,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-10-24 12:34:08,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 78 transitions. [2018-10-24 12:34:08,968 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 78 transitions. Word has length 66 [2018-10-24 12:34:08,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:08,969 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 78 transitions. [2018-10-24 12:34:08,969 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-24 12:34:08,969 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 78 transitions. [2018-10-24 12:34:08,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-10-24 12:34:08,970 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:08,970 INFO L375 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:08,970 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:08,970 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:08,971 INFO L82 PathProgramCache]: Analyzing trace with hash -781092252, now seen corresponding path program 11 times [2018-10-24 12:34:08,971 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:08,971 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:08,972 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:08,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:08,972 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:08,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:09,316 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:34:09,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:09,317 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:09,317 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:09,317 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:09,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:09,317 INFO L194 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 [2018-10-24 12:34:09,324 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:09,325 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:09,350 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-24 12:34:09,350 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:09,354 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:09,367 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:34:09,367 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:09,630 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 90 proven. 42 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:34:09,651 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:09,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 17 [2018-10-24 12:34:09,651 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:09,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:34:09,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:34:09,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:34:09,652 INFO L87 Difference]: Start difference. First operand 77 states and 78 transitions. Second operand 17 states. [2018-10-24 12:34:10,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:10,109 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2018-10-24 12:34:10,112 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:34:10,112 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 74 [2018-10-24 12:34:10,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:10,113 INFO L225 Difference]: With dead ends: 116 [2018-10-24 12:34:10,113 INFO L226 Difference]: Without dead ends: 79 [2018-10-24 12:34:10,114 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 135 SyntacticMatches, 14 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=161, Invalid=439, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:34:10,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-10-24 12:34:10,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2018-10-24 12:34:10,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-10-24 12:34:10,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2018-10-24 12:34:10,121 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2018-10-24 12:34:10,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:10,122 INFO L481 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2018-10-24 12:34:10,122 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:34:10,122 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2018-10-24 12:34:10,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2018-10-24 12:34:10,123 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:10,123 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:10,123 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:10,123 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:10,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1719160158, now seen corresponding path program 12 times [2018-10-24 12:34:10,124 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:10,124 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:10,125 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:10,125 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:10,125 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:10,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:10,317 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 67 proven. 94 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-10-24 12:34:10,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:10,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:10,318 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:10,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:10,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:10,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:10,325 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:10,326 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:10,347 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:10,347 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:10,350 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:10,667 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:34:10,668 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:10,841 INFO L134 CoverageAnalysis]: Checked inductivity of 206 backedges. 68 proven. 78 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-10-24 12:34:10,863 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:10,864 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 15 [2018-10-24 12:34:10,864 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:10,864 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-24 12:34:10,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-24 12:34:10,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2018-10-24 12:34:10,865 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand 15 states. [2018-10-24 12:34:11,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:11,002 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2018-10-24 12:34:11,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-24 12:34:11,002 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 76 [2018-10-24 12:34:11,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:11,004 INFO L225 Difference]: With dead ends: 89 [2018-10-24 12:34:11,004 INFO L226 Difference]: Without dead ends: 87 [2018-10-24 12:34:11,004 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 144 SyntacticMatches, 15 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:34:11,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2018-10-24 12:34:11,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2018-10-24 12:34:11,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-10-24 12:34:11,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2018-10-24 12:34:11,011 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 76 [2018-10-24 12:34:11,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:11,011 INFO L481 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2018-10-24 12:34:11,011 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-24 12:34:11,011 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2018-10-24 12:34:11,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2018-10-24 12:34:11,012 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:11,012 INFO L375 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:11,013 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:11,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:11,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1817810527, now seen corresponding path program 13 times [2018-10-24 12:34:11,013 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:11,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:11,014 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:11,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:11,014 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:11,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:11,190 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:11,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:11,191 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:11,191 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:11,191 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:11,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:11,191 INFO L194 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 [2018-10-24 12:34:11,198 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:11,199 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:11,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:11,227 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:11,241 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:11,241 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:11,390 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 119 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:11,410 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:11,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 19 [2018-10-24 12:34:11,410 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:11,411 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:34:11,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:34:11,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:11,411 INFO L87 Difference]: Start difference. First operand 87 states and 88 transitions. Second operand 19 states. [2018-10-24 12:34:11,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:11,717 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2018-10-24 12:34:11,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:34:11,725 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 84 [2018-10-24 12:34:11,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:11,726 INFO L225 Difference]: With dead ends: 130 [2018-10-24 12:34:11,726 INFO L226 Difference]: Without dead ends: 89 [2018-10-24 12:34:11,727 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 153 SyntacticMatches, 16 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=199, Invalid=557, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:34:11,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2018-10-24 12:34:11,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2018-10-24 12:34:11,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-10-24 12:34:11,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 90 transitions. [2018-10-24 12:34:11,734 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 90 transitions. Word has length 84 [2018-10-24 12:34:11,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:11,735 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 90 transitions. [2018-10-24 12:34:11,735 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:34:11,735 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 90 transitions. [2018-10-24 12:34:11,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2018-10-24 12:34:11,736 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:11,736 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:11,736 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:11,737 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:11,737 INFO L82 PathProgramCache]: Analyzing trace with hash 455429147, now seen corresponding path program 14 times [2018-10-24 12:34:11,737 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:11,737 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:11,738 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:11,738 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:11,738 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:11,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:12,055 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-10-24 12:34:12,055 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:12,056 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:12,056 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:12,056 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:12,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:12,056 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:12,070 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:12,070 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:12,106 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-24 12:34:12,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:12,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:12,160 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:12,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:12,290 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 86 proven. 105 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-10-24 12:34:12,310 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:12,311 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 16 [2018-10-24 12:34:12,311 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:12,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-24 12:34:12,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-24 12:34:12,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-24 12:34:12,312 INFO L87 Difference]: Start difference. First operand 89 states and 90 transitions. Second operand 16 states. [2018-10-24 12:34:12,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:12,491 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2018-10-24 12:34:12,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-24 12:34:12,492 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 86 [2018-10-24 12:34:12,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:12,493 INFO L225 Difference]: With dead ends: 99 [2018-10-24 12:34:12,493 INFO L226 Difference]: Without dead ends: 97 [2018-10-24 12:34:12,494 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 163 SyntacticMatches, 17 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:34:12,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2018-10-24 12:34:12,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2018-10-24 12:34:12,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-10-24 12:34:12,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-10-24 12:34:12,500 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 86 [2018-10-24 12:34:12,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:12,501 INFO L481 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-10-24 12:34:12,501 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-24 12:34:12,501 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-10-24 12:34:12,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-10-24 12:34:12,502 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:12,502 INFO L375 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:12,502 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:12,503 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:12,503 INFO L82 PathProgramCache]: Analyzing trace with hash 955997022, now seen corresponding path program 15 times [2018-10-24 12:34:12,503 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:12,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:12,504 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:12,504 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:12,504 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:12,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:12,704 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:34:12,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:12,705 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:12,705 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:12,705 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:12,705 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:12,705 INFO L194 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 [2018-10-24 12:34:12,713 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:12,713 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:12,747 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:12,747 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:12,750 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:12,774 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:34:12,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:12,971 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 152 proven. 72 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:34:12,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:12,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 21 [2018-10-24 12:34:12,992 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:12,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:34:12,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:34:12,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:34:12,993 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 21 states. [2018-10-24 12:34:13,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:13,299 INFO L93 Difference]: Finished difference Result 144 states and 154 transitions. [2018-10-24 12:34:13,306 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:34:13,306 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 94 [2018-10-24 12:34:13,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:13,307 INFO L225 Difference]: With dead ends: 144 [2018-10-24 12:34:13,308 INFO L226 Difference]: Without dead ends: 99 [2018-10-24 12:34:13,309 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 171 SyntacticMatches, 18 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=241, Invalid=689, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:34:13,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-10-24 12:34:13,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2018-10-24 12:34:13,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-10-24 12:34:13,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 100 transitions. [2018-10-24 12:34:13,321 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 100 transitions. Word has length 94 [2018-10-24 12:34:13,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:13,321 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 100 transitions. [2018-10-24 12:34:13,321 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:34:13,321 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 100 transitions. [2018-10-24 12:34:13,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2018-10-24 12:34:13,322 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:13,322 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:13,323 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:13,323 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:13,323 INFO L82 PathProgramCache]: Analyzing trace with hash -708514472, now seen corresponding path program 16 times [2018-10-24 12:34:13,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:13,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:13,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:13,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:13,324 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:13,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:14,069 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 105 proven. 158 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-10-24 12:34:14,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:14,070 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:14,070 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:14,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:14,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:14,070 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:14,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:14,079 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:14,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:14,111 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:14,180 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:34:14,180 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:14,494 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 106 proven. 136 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2018-10-24 12:34:14,514 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:14,515 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 17 [2018-10-24 12:34:14,515 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:14,515 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-24 12:34:14,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-24 12:34:14,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=194, Unknown=0, NotChecked=0, Total=272 [2018-10-24 12:34:14,516 INFO L87 Difference]: Start difference. First operand 99 states and 100 transitions. Second operand 17 states. [2018-10-24 12:34:14,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:14,756 INFO L93 Difference]: Finished difference Result 109 states and 110 transitions. [2018-10-24 12:34:14,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-24 12:34:14,756 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 96 [2018-10-24 12:34:14,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:14,758 INFO L225 Difference]: With dead ends: 109 [2018-10-24 12:34:14,758 INFO L226 Difference]: Without dead ends: 107 [2018-10-24 12:34:14,759 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 182 SyntacticMatches, 19 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:14,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-10-24 12:34:14,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2018-10-24 12:34:14,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2018-10-24 12:34:14,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 108 transitions. [2018-10-24 12:34:14,766 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 108 transitions. Word has length 96 [2018-10-24 12:34:14,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:14,766 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 108 transitions. [2018-10-24 12:34:14,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-24 12:34:14,766 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 108 transitions. [2018-10-24 12:34:14,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-10-24 12:34:14,767 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:14,767 INFO L375 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:14,768 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:14,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:14,768 INFO L82 PathProgramCache]: Analyzing trace with hash 1119383451, now seen corresponding path program 17 times [2018-10-24 12:34:14,768 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:14,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:14,769 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:14,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:14,769 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:14,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:14,987 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:14,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:14,987 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:14,987 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:14,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:14,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:14,987 INFO L194 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 [2018-10-24 12:34:14,996 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:14,996 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:15,051 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-24 12:34:15,051 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:15,053 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:15,069 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:15,069 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:15,298 INFO L134 CoverageAnalysis]: Checked inductivity of 423 backedges. 189 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:15,318 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:15,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 23 [2018-10-24 12:34:15,319 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:15,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:34:15,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:34:15,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=373, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:34:15,320 INFO L87 Difference]: Start difference. First operand 107 states and 108 transitions. Second operand 23 states. [2018-10-24 12:34:15,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:15,732 INFO L93 Difference]: Finished difference Result 158 states and 169 transitions. [2018-10-24 12:34:15,733 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:34:15,733 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 104 [2018-10-24 12:34:15,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:15,734 INFO L225 Difference]: With dead ends: 158 [2018-10-24 12:34:15,734 INFO L226 Difference]: Without dead ends: 109 [2018-10-24 12:34:15,735 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 189 SyntacticMatches, 20 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=287, Invalid=835, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:34:15,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2018-10-24 12:34:15,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2018-10-24 12:34:15,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2018-10-24 12:34:15,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2018-10-24 12:34:15,741 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2018-10-24 12:34:15,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:15,742 INFO L481 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2018-10-24 12:34:15,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:34:15,742 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2018-10-24 12:34:15,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2018-10-24 12:34:15,743 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:15,743 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:15,743 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:15,743 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:15,743 INFO L82 PathProgramCache]: Analyzing trace with hash 685199637, now seen corresponding path program 18 times [2018-10-24 12:34:15,744 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:15,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:15,744 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:15,744 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:15,745 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:15,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:15,938 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 127 proven. 196 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-10-24 12:34:15,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:15,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:15,939 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:15,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:15,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:15,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:15,947 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:15,947 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:15,980 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:15,980 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:15,982 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:16,038 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:16,038 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:16,278 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 128 proven. 171 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2018-10-24 12:34:16,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:16,308 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 18 [2018-10-24 12:34:16,308 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:16,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-24 12:34:16,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-24 12:34:16,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=216, Unknown=0, NotChecked=0, Total=306 [2018-10-24 12:34:16,309 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand 18 states. [2018-10-24 12:34:16,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:16,532 INFO L93 Difference]: Finished difference Result 119 states and 120 transitions. [2018-10-24 12:34:16,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-24 12:34:16,532 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2018-10-24 12:34:16,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:16,535 INFO L225 Difference]: With dead ends: 119 [2018-10-24 12:34:16,535 INFO L226 Difference]: Without dead ends: 117 [2018-10-24 12:34:16,536 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 201 SyntacticMatches, 21 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:34:16,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2018-10-24 12:34:16,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2018-10-24 12:34:16,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2018-10-24 12:34:16,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 118 transitions. [2018-10-24 12:34:16,543 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 118 transitions. Word has length 106 [2018-10-24 12:34:16,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:16,543 INFO L481 AbstractCegarLoop]: Abstraction has 117 states and 118 transitions. [2018-10-24 12:34:16,543 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-24 12:34:16,543 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 118 transitions. [2018-10-24 12:34:16,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2018-10-24 12:34:16,544 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:16,544 INFO L375 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:16,544 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:16,545 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:16,545 INFO L82 PathProgramCache]: Analyzing trace with hash 1363002968, now seen corresponding path program 19 times [2018-10-24 12:34:16,545 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:16,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:16,546 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:16,546 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:16,546 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:16,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:16,854 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:34:16,854 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:16,854 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:16,854 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:16,855 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:16,855 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:16,855 INFO L194 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 [2018-10-24 12:34:16,865 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:16,865 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:16,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:16,901 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:16,915 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:34:16,915 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:17,113 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 230 proven. 110 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:34:17,133 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:17,133 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 25 [2018-10-24 12:34:17,133 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:17,134 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:34:17,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:34:17,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=443, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:34:17,135 INFO L87 Difference]: Start difference. First operand 117 states and 118 transitions. Second operand 25 states. [2018-10-24 12:34:17,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:17,827 INFO L93 Difference]: Finished difference Result 172 states and 184 transitions. [2018-10-24 12:34:17,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:34:17,829 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 114 [2018-10-24 12:34:17,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:17,830 INFO L225 Difference]: With dead ends: 172 [2018-10-24 12:34:17,830 INFO L226 Difference]: Without dead ends: 119 [2018-10-24 12:34:17,831 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 207 SyntacticMatches, 22 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=337, Invalid=995, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:34:17,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-10-24 12:34:17,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2018-10-24 12:34:17,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-10-24 12:34:17,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2018-10-24 12:34:17,838 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 114 [2018-10-24 12:34:17,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:17,838 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2018-10-24 12:34:17,838 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:34:17,839 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2018-10-24 12:34:17,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-10-24 12:34:17,839 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:17,840 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:17,840 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:17,840 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:17,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1611360430, now seen corresponding path program 20 times [2018-10-24 12:34:17,840 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:17,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:17,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:17,841 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:17,841 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:17,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:18,159 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 151 proven. 238 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-10-24 12:34:18,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:18,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:18,159 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:18,159 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:18,159 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:18,160 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:18,167 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:18,167 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:18,216 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-24 12:34:18,216 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:18,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:18,280 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:34:18,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:18,533 INFO L134 CoverageAnalysis]: Checked inductivity of 542 backedges. 152 proven. 210 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2018-10-24 12:34:18,555 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:18,555 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 19 [2018-10-24 12:34:18,556 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:18,556 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-24 12:34:18,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-24 12:34:18,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=239, Unknown=0, NotChecked=0, Total=342 [2018-10-24 12:34:18,557 INFO L87 Difference]: Start difference. First operand 119 states and 120 transitions. Second operand 19 states. [2018-10-24 12:34:18,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:18,731 INFO L93 Difference]: Finished difference Result 129 states and 130 transitions. [2018-10-24 12:34:18,731 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-24 12:34:18,731 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 116 [2018-10-24 12:34:18,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:18,733 INFO L225 Difference]: With dead ends: 129 [2018-10-24 12:34:18,733 INFO L226 Difference]: Without dead ends: 127 [2018-10-24 12:34:18,734 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 220 SyntacticMatches, 23 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:34:18,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2018-10-24 12:34:18,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2018-10-24 12:34:18,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-10-24 12:34:18,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2018-10-24 12:34:18,740 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 116 [2018-10-24 12:34:18,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:18,740 INFO L481 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2018-10-24 12:34:18,740 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-24 12:34:18,740 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2018-10-24 12:34:18,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2018-10-24 12:34:18,741 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:18,741 INFO L375 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:18,742 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:18,742 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:18,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1711505301, now seen corresponding path program 21 times [2018-10-24 12:34:18,742 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:18,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:18,743 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:18,743 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:18,743 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:18,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:20,102 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:20,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:20,102 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:20,102 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:20,103 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:20,103 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:20,103 INFO L194 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 [2018-10-24 12:34:20,115 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:20,115 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:20,170 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:20,170 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:20,174 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:20,193 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:20,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:20,489 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 275 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:20,509 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:20,509 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 27 [2018-10-24 12:34:20,509 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:20,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:34:20,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:34:20,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=519, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:20,510 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand 27 states. [2018-10-24 12:34:21,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:21,038 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2018-10-24 12:34:21,040 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:34:21,040 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 124 [2018-10-24 12:34:21,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:21,041 INFO L225 Difference]: With dead ends: 186 [2018-10-24 12:34:21,041 INFO L226 Difference]: Without dead ends: 129 [2018-10-24 12:34:21,042 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 225 SyntacticMatches, 24 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 473 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=391, Invalid=1169, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:34:21,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2018-10-24 12:34:21,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2018-10-24 12:34:21,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2018-10-24 12:34:21,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 130 transitions. [2018-10-24 12:34:21,052 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 130 transitions. Word has length 124 [2018-10-24 12:34:21,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:21,053 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 130 transitions. [2018-10-24 12:34:21,053 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:34:21,053 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 130 transitions. [2018-10-24 12:34:21,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2018-10-24 12:34:21,055 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:21,056 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:21,056 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:21,056 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:21,056 INFO L82 PathProgramCache]: Analyzing trace with hash -2117279729, now seen corresponding path program 22 times [2018-10-24 12:34:21,056 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:21,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:21,057 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:21,057 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:21,057 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:21,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:21,301 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 177 proven. 284 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2018-10-24 12:34:21,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:21,302 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:21,302 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:21,302 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:21,302 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:21,302 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:21,309 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:21,309 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:21,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:21,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:21,564 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:21,565 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:21,731 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 178 proven. 253 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2018-10-24 12:34:21,751 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:21,751 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 20 [2018-10-24 12:34:21,752 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:21,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-24 12:34:21,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-24 12:34:21,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=263, Unknown=0, NotChecked=0, Total=380 [2018-10-24 12:34:21,753 INFO L87 Difference]: Start difference. First operand 129 states and 130 transitions. Second operand 20 states. [2018-10-24 12:34:21,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:21,975 INFO L93 Difference]: Finished difference Result 139 states and 140 transitions. [2018-10-24 12:34:21,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-24 12:34:21,976 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 126 [2018-10-24 12:34:21,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:21,978 INFO L225 Difference]: With dead ends: 139 [2018-10-24 12:34:21,978 INFO L226 Difference]: Without dead ends: 137 [2018-10-24 12:34:21,979 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 239 SyntacticMatches, 25 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=130, Invalid=332, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:34:21,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2018-10-24 12:34:21,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2018-10-24 12:34:21,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-10-24 12:34:21,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 138 transitions. [2018-10-24 12:34:21,986 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 138 transitions. Word has length 126 [2018-10-24 12:34:21,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:21,986 INFO L481 AbstractCegarLoop]: Abstraction has 137 states and 138 transitions. [2018-10-24 12:34:21,986 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-24 12:34:21,986 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 138 transitions. [2018-10-24 12:34:21,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2018-10-24 12:34:21,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:21,987 INFO L375 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:21,988 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:21,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:21,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1516651694, now seen corresponding path program 23 times [2018-10-24 12:34:21,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:21,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:21,989 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:21,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:21,989 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:21,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:22,280 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:34:22,280 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:22,280 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:22,281 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:22,281 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:22,281 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:22,281 INFO L194 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 [2018-10-24 12:34:22,289 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:22,289 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:22,335 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2018-10-24 12:34:22,335 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:22,339 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:22,361 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:34:22,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:22,908 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 324 proven. 156 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:34:22,927 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:22,928 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 29 [2018-10-24 12:34:22,928 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:22,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:34:22,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:34:22,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=601, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:34:22,929 INFO L87 Difference]: Start difference. First operand 137 states and 138 transitions. Second operand 29 states. [2018-10-24 12:34:23,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:23,498 INFO L93 Difference]: Finished difference Result 200 states and 214 transitions. [2018-10-24 12:34:23,503 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:34:23,503 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 134 [2018-10-24 12:34:23,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:23,504 INFO L225 Difference]: With dead ends: 200 [2018-10-24 12:34:23,504 INFO L226 Difference]: Without dead ends: 139 [2018-10-24 12:34:23,505 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 243 SyntacticMatches, 26 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=449, Invalid=1357, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:34:23,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-24 12:34:23,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2018-10-24 12:34:23,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-10-24 12:34:23,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2018-10-24 12:34:23,513 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2018-10-24 12:34:23,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:23,514 INFO L481 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2018-10-24 12:34:23,514 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:34:23,514 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2018-10-24 12:34:23,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2018-10-24 12:34:23,515 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:23,515 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:23,515 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:23,515 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:23,515 INFO L82 PathProgramCache]: Analyzing trace with hash 304630604, now seen corresponding path program 24 times [2018-10-24 12:34:23,516 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:23,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:23,516 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:23,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:23,517 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:23,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:23,935 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 205 proven. 334 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2018-10-24 12:34:23,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:23,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:23,935 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:23,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:23,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:23,936 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:23,958 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:23,958 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:23,998 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:23,999 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:24,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:24,073 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:34:24,073 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:24,313 INFO L134 CoverageAnalysis]: Checked inductivity of 770 backedges. 206 proven. 300 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-10-24 12:34:24,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:24,333 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 21 [2018-10-24 12:34:24,333 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:24,334 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-24 12:34:24,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-24 12:34:24,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=288, Unknown=0, NotChecked=0, Total=420 [2018-10-24 12:34:24,334 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand 21 states. [2018-10-24 12:34:24,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:24,651 INFO L93 Difference]: Finished difference Result 149 states and 150 transitions. [2018-10-24 12:34:24,651 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-24 12:34:24,651 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 136 [2018-10-24 12:34:24,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:24,652 INFO L225 Difference]: With dead ends: 149 [2018-10-24 12:34:24,652 INFO L226 Difference]: Without dead ends: 147 [2018-10-24 12:34:24,653 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 258 SyntacticMatches, 27 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:34:24,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-10-24 12:34:24,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2018-10-24 12:34:24,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2018-10-24 12:34:24,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 148 transitions. [2018-10-24 12:34:24,661 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 148 transitions. Word has length 136 [2018-10-24 12:34:24,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:24,661 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 148 transitions. [2018-10-24 12:34:24,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-24 12:34:24,661 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 148 transitions. [2018-10-24 12:34:24,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2018-10-24 12:34:24,663 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:24,664 INFO L375 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:24,664 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:24,664 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:24,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1717003889, now seen corresponding path program 25 times [2018-10-24 12:34:24,664 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:24,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:24,665 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:24,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:24,665 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:24,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:25,084 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:25,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:25,084 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:25,084 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:25,084 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:25,084 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:25,085 INFO L194 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 [2018-10-24 12:34:25,094 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:25,094 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:25,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:25,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:25,162 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:25,162 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:25,570 INFO L134 CoverageAnalysis]: Checked inductivity of 871 backedges. 377 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:25,591 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:25,591 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 31 [2018-10-24 12:34:25,591 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:25,592 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:34:25,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:34:25,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=689, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:34:25,592 INFO L87 Difference]: Start difference. First operand 147 states and 148 transitions. Second operand 31 states. [2018-10-24 12:34:27,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:27,121 INFO L93 Difference]: Finished difference Result 214 states and 229 transitions. [2018-10-24 12:34:27,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:34:27,121 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 144 [2018-10-24 12:34:27,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:27,122 INFO L225 Difference]: With dead ends: 214 [2018-10-24 12:34:27,122 INFO L226 Difference]: Without dead ends: 149 [2018-10-24 12:34:27,123 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 261 SyntacticMatches, 28 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 650 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=511, Invalid=1559, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:34:27,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-10-24 12:34:27,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2018-10-24 12:34:27,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-10-24 12:34:27,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 150 transitions. [2018-10-24 12:34:27,131 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 150 transitions. Word has length 144 [2018-10-24 12:34:27,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:27,132 INFO L481 AbstractCegarLoop]: Abstraction has 149 states and 150 transitions. [2018-10-24 12:34:27,132 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:34:27,132 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 150 transitions. [2018-10-24 12:34:27,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-10-24 12:34:27,133 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:27,133 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:27,133 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:27,133 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:27,134 INFO L82 PathProgramCache]: Analyzing trace with hash 1407645961, now seen corresponding path program 26 times [2018-10-24 12:34:27,134 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:27,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:27,134 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:27,135 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:27,135 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:27,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:27,440 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 235 proven. 388 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2018-10-24 12:34:27,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:27,440 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:27,440 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:27,440 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:27,440 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:27,441 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:27,448 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:27,448 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:27,542 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-24 12:34:27,542 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:27,545 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:28,132 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:28,132 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:28,799 INFO L134 CoverageAnalysis]: Checked inductivity of 899 backedges. 236 proven. 351 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2018-10-24 12:34:28,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:28,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 22 [2018-10-24 12:34:28,819 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:28,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-24 12:34:28,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-24 12:34:28,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=314, Unknown=0, NotChecked=0, Total=462 [2018-10-24 12:34:28,820 INFO L87 Difference]: Start difference. First operand 149 states and 150 transitions. Second operand 22 states. [2018-10-24 12:34:29,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:29,042 INFO L93 Difference]: Finished difference Result 159 states and 160 transitions. [2018-10-24 12:34:29,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-24 12:34:29,043 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 146 [2018-10-24 12:34:29,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:29,045 INFO L225 Difference]: With dead ends: 159 [2018-10-24 12:34:29,045 INFO L226 Difference]: Without dead ends: 157 [2018-10-24 12:34:29,045 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 277 SyntacticMatches, 29 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 312 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=161, Invalid=391, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:34:29,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2018-10-24 12:34:29,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2018-10-24 12:34:29,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2018-10-24 12:34:29,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2018-10-24 12:34:29,053 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 146 [2018-10-24 12:34:29,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:29,053 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2018-10-24 12:34:29,054 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-24 12:34:29,054 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2018-10-24 12:34:29,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2018-10-24 12:34:29,055 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:29,055 INFO L375 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:29,055 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:29,055 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:29,055 INFO L82 PathProgramCache]: Analyzing trace with hash -219137460, now seen corresponding path program 27 times [2018-10-24 12:34:29,056 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:29,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:29,056 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:29,056 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:29,056 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:29,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:30,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:34:30,022 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:30,022 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:30,023 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:30,023 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:30,023 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:30,023 INFO L194 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 [2018-10-24 12:34:30,031 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:30,031 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:30,082 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:30,082 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:30,087 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:30,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:34:30,132 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:30,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 434 proven. 210 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:34:30,853 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:30,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 33 [2018-10-24 12:34:30,853 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:30,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:34:30,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:34:30,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=783, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:34:30,855 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand 33 states. [2018-10-24 12:34:31,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:31,657 INFO L93 Difference]: Finished difference Result 228 states and 244 transitions. [2018-10-24 12:34:31,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:34:31,657 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 154 [2018-10-24 12:34:31,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:31,658 INFO L225 Difference]: With dead ends: 228 [2018-10-24 12:34:31,658 INFO L226 Difference]: Without dead ends: 159 [2018-10-24 12:34:31,660 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 279 SyntacticMatches, 30 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 749 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=577, Invalid=1775, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:34:31,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-10-24 12:34:31,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 159. [2018-10-24 12:34:31,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2018-10-24 12:34:31,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 160 transitions. [2018-10-24 12:34:31,668 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 160 transitions. Word has length 154 [2018-10-24 12:34:31,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:31,668 INFO L481 AbstractCegarLoop]: Abstraction has 159 states and 160 transitions. [2018-10-24 12:34:31,668 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:34:31,669 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 160 transitions. [2018-10-24 12:34:31,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2018-10-24 12:34:31,669 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:31,670 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:31,670 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:31,670 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:31,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1258359110, now seen corresponding path program 28 times [2018-10-24 12:34:31,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:31,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:31,671 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:31,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:31,671 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:31,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:32,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 267 proven. 446 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-10-24 12:34:32,460 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:32,460 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:32,460 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:32,460 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:32,461 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:32,461 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:32,468 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:32,468 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:32,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:32,521 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:32,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:34:32,608 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:32,865 INFO L134 CoverageAnalysis]: Checked inductivity of 1038 backedges. 268 proven. 406 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-10-24 12:34:32,885 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:32,885 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 23 [2018-10-24 12:34:32,886 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:32,886 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-24 12:34:32,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-24 12:34:32,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=341, Unknown=0, NotChecked=0, Total=506 [2018-10-24 12:34:32,887 INFO L87 Difference]: Start difference. First operand 159 states and 160 transitions. Second operand 23 states. [2018-10-24 12:34:33,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:33,426 INFO L93 Difference]: Finished difference Result 169 states and 170 transitions. [2018-10-24 12:34:33,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-24 12:34:33,427 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 156 [2018-10-24 12:34:33,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:33,429 INFO L225 Difference]: With dead ends: 169 [2018-10-24 12:34:33,430 INFO L226 Difference]: Without dead ends: 167 [2018-10-24 12:34:33,430 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 296 SyntacticMatches, 31 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=178, Invalid=422, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:34:33,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-10-24 12:34:33,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 167. [2018-10-24 12:34:33,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2018-10-24 12:34:33,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 168 transitions. [2018-10-24 12:34:33,437 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 168 transitions. Word has length 156 [2018-10-24 12:34:33,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:33,437 INFO L481 AbstractCegarLoop]: Abstraction has 167 states and 168 transitions. [2018-10-24 12:34:33,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-24 12:34:33,437 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 168 transitions. [2018-10-24 12:34:33,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-10-24 12:34:33,438 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:33,438 INFO L375 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:33,439 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:33,439 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:33,439 INFO L82 PathProgramCache]: Analyzing trace with hash -884425335, now seen corresponding path program 29 times [2018-10-24 12:34:33,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:33,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:33,440 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:33,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:33,440 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:33,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:33,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:33,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:33,968 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:33,968 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:33,968 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:33,968 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:33,968 INFO L194 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 [2018-10-24 12:34:33,975 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:33,975 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:34,032 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-10-24 12:34:34,032 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:34,036 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:34,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:34,058 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:34,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 495 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:34,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:34,456 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 35 [2018-10-24 12:34:34,456 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:34,456 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:34:34,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:34:34,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=883, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:34:34,457 INFO L87 Difference]: Start difference. First operand 167 states and 168 transitions. Second operand 35 states. [2018-10-24 12:34:35,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:35,602 INFO L93 Difference]: Finished difference Result 242 states and 259 transitions. [2018-10-24 12:34:35,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:34:35,602 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 164 [2018-10-24 12:34:35,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:35,604 INFO L225 Difference]: With dead ends: 242 [2018-10-24 12:34:35,604 INFO L226 Difference]: Without dead ends: 169 [2018-10-24 12:34:35,605 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 297 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 855 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=647, Invalid=2005, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:34:35,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-10-24 12:34:35,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2018-10-24 12:34:35,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-10-24 12:34:35,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2018-10-24 12:34:35,614 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2018-10-24 12:34:35,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:35,615 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2018-10-24 12:34:35,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:34:35,615 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2018-10-24 12:34:35,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-10-24 12:34:35,616 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:35,616 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:35,616 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:35,616 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:35,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1098474493, now seen corresponding path program 30 times [2018-10-24 12:34:35,617 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:35,617 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:35,617 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:35,618 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:35,618 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:35,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:36,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 301 proven. 508 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2018-10-24 12:34:36,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:36,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:36,298 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:36,298 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:36,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:36,299 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:36,326 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:36,326 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:36,376 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:36,376 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:36,380 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:37,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:37,074 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:37,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1187 backedges. 302 proven. 465 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2018-10-24 12:34:37,699 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:37,699 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 24 [2018-10-24 12:34:37,699 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:37,700 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-24 12:34:37,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-24 12:34:37,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=369, Unknown=0, NotChecked=0, Total=552 [2018-10-24 12:34:37,701 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand 24 states. [2018-10-24 12:34:37,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:37,963 INFO L93 Difference]: Finished difference Result 179 states and 180 transitions. [2018-10-24 12:34:37,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-24 12:34:37,964 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 166 [2018-10-24 12:34:37,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:37,966 INFO L225 Difference]: With dead ends: 179 [2018-10-24 12:34:37,966 INFO L226 Difference]: Without dead ends: 177 [2018-10-24 12:34:37,966 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 372 GetRequests, 315 SyntacticMatches, 33 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=196, Invalid=454, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:37,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-10-24 12:34:37,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2018-10-24 12:34:37,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2018-10-24 12:34:37,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 178 transitions. [2018-10-24 12:34:37,975 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 178 transitions. Word has length 166 [2018-10-24 12:34:37,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:37,975 INFO L481 AbstractCegarLoop]: Abstraction has 177 states and 178 transitions. [2018-10-24 12:34:37,976 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-24 12:34:37,976 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 178 transitions. [2018-10-24 12:34:37,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2018-10-24 12:34:37,977 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:37,977 INFO L375 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:37,977 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:37,977 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:37,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1738687302, now seen corresponding path program 31 times [2018-10-24 12:34:37,978 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:37,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:37,978 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:37,978 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:37,979 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:37,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:38,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:34:38,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:38,859 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:38,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:38,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:38,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:38,860 INFO L194 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 [2018-10-24 12:34:38,866 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:38,867 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:38,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:38,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:38,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:34:38,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:39,408 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 560 proven. 272 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:34:39,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:39,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 37 [2018-10-24 12:34:39,428 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:39,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:34:39,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:34:39,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=343, Invalid=989, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:34:39,430 INFO L87 Difference]: Start difference. First operand 177 states and 178 transitions. Second operand 37 states. [2018-10-24 12:34:40,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:40,810 INFO L93 Difference]: Finished difference Result 256 states and 274 transitions. [2018-10-24 12:34:40,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:34:40,811 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 174 [2018-10-24 12:34:40,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:40,812 INFO L225 Difference]: With dead ends: 256 [2018-10-24 12:34:40,813 INFO L226 Difference]: Without dead ends: 179 [2018-10-24 12:34:40,814 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 315 SyntacticMatches, 34 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 968 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=721, Invalid=2249, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:34:40,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2018-10-24 12:34:40,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2018-10-24 12:34:40,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2018-10-24 12:34:40,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 180 transitions. [2018-10-24 12:34:40,823 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 180 transitions. Word has length 174 [2018-10-24 12:34:40,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:40,824 INFO L481 AbstractCegarLoop]: Abstraction has 179 states and 180 transitions. [2018-10-24 12:34:40,824 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:34:40,824 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 180 transitions. [2018-10-24 12:34:40,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2018-10-24 12:34:40,825 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:40,825 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:40,825 INFO L424 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:40,826 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:40,827 INFO L82 PathProgramCache]: Analyzing trace with hash 2057294144, now seen corresponding path program 32 times [2018-10-24 12:34:40,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:40,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:40,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:40,827 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:40,828 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:40,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:41,330 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 337 proven. 574 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2018-10-24 12:34:41,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:41,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:41,331 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:41,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:41,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:41,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:41,338 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:41,338 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:41,422 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-24 12:34:41,422 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:41,427 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:41,532 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:34:41,532 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:41,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1346 backedges. 338 proven. 528 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2018-10-24 12:34:41,902 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:41,902 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 25 [2018-10-24 12:34:41,902 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:41,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-24 12:34:41,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-24 12:34:41,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=398, Unknown=0, NotChecked=0, Total=600 [2018-10-24 12:34:41,903 INFO L87 Difference]: Start difference. First operand 179 states and 180 transitions. Second operand 25 states. [2018-10-24 12:34:43,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:43,039 INFO L93 Difference]: Finished difference Result 189 states and 190 transitions. [2018-10-24 12:34:43,039 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-24 12:34:43,039 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 176 [2018-10-24 12:34:43,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:43,041 INFO L225 Difference]: With dead ends: 189 [2018-10-24 12:34:43,041 INFO L226 Difference]: Without dead ends: 187 [2018-10-24 12:34:43,042 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 334 SyntacticMatches, 35 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=215, Invalid=487, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:43,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2018-10-24 12:34:43,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 187. [2018-10-24 12:34:43,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-10-24 12:34:43,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 188 transitions. [2018-10-24 12:34:43,050 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 188 transitions. Word has length 176 [2018-10-24 12:34:43,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:43,051 INFO L481 AbstractCegarLoop]: Abstraction has 187 states and 188 transitions. [2018-10-24 12:34:43,051 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-24 12:34:43,051 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 188 transitions. [2018-10-24 12:34:43,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2018-10-24 12:34:43,052 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:43,052 INFO L375 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:43,052 INFO L424 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:43,052 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:43,052 INFO L82 PathProgramCache]: Analyzing trace with hash 2047142787, now seen corresponding path program 33 times [2018-10-24 12:34:43,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:43,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:43,053 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:43,053 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:43,053 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:43,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:43,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:43,703 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:43,704 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:43,704 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:43,704 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:43,704 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:43,704 INFO L194 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 [2018-10-24 12:34:43,711 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:43,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:43,762 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:43,762 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:43,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:43,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:43,801 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:44,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1479 backedges. 629 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:44,615 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:44,615 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 39 [2018-10-24 12:34:44,615 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:44,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:34:44,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:34:44,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=381, Invalid=1101, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:34:44,616 INFO L87 Difference]: Start difference. First operand 187 states and 188 transitions. Second operand 39 states. [2018-10-24 12:34:45,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:45,851 INFO L93 Difference]: Finished difference Result 270 states and 289 transitions. [2018-10-24 12:34:45,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:34:45,852 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 184 [2018-10-24 12:34:45,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:45,853 INFO L225 Difference]: With dead ends: 270 [2018-10-24 12:34:45,853 INFO L226 Difference]: Without dead ends: 189 [2018-10-24 12:34:45,855 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 333 SyntacticMatches, 36 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1088 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=799, Invalid=2507, Unknown=0, NotChecked=0, Total=3306 [2018-10-24 12:34:45,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2018-10-24 12:34:45,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 189. [2018-10-24 12:34:45,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2018-10-24 12:34:45,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 190 transitions. [2018-10-24 12:34:45,864 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 190 transitions. Word has length 184 [2018-10-24 12:34:45,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:45,864 INFO L481 AbstractCegarLoop]: Abstraction has 189 states and 190 transitions. [2018-10-24 12:34:45,864 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:34:45,864 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 190 transitions. [2018-10-24 12:34:45,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2018-10-24 12:34:45,865 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:45,865 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:45,866 INFO L424 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:45,866 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:45,866 INFO L82 PathProgramCache]: Analyzing trace with hash 311216381, now seen corresponding path program 34 times [2018-10-24 12:34:45,866 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:45,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:45,867 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:45,867 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:45,867 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:45,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:46,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 375 proven. 644 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2018-10-24 12:34:46,254 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:46,254 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:46,254 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:46,254 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:46,255 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:46,255 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:46,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:46,262 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:46,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:46,320 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:46,410 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:46,410 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:46,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1515 backedges. 376 proven. 595 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2018-10-24 12:34:46,752 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:46,753 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 26 [2018-10-24 12:34:46,753 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:46,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-24 12:34:46,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-24 12:34:46,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=428, Unknown=0, NotChecked=0, Total=650 [2018-10-24 12:34:46,754 INFO L87 Difference]: Start difference. First operand 189 states and 190 transitions. Second operand 26 states. [2018-10-24 12:34:47,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:47,030 INFO L93 Difference]: Finished difference Result 199 states and 200 transitions. [2018-10-24 12:34:47,031 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-24 12:34:47,031 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 186 [2018-10-24 12:34:47,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:47,033 INFO L225 Difference]: With dead ends: 199 [2018-10-24 12:34:47,033 INFO L226 Difference]: Without dead ends: 197 [2018-10-24 12:34:47,034 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 353 SyntacticMatches, 37 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=235, Invalid=521, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:34:47,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-10-24 12:34:47,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2018-10-24 12:34:47,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2018-10-24 12:34:47,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 198 transitions. [2018-10-24 12:34:47,043 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 198 transitions. Word has length 186 [2018-10-24 12:34:47,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:47,043 INFO L481 AbstractCegarLoop]: Abstraction has 197 states and 198 transitions. [2018-10-24 12:34:47,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-24 12:34:47,044 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 198 transitions. [2018-10-24 12:34:47,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2018-10-24 12:34:47,045 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:47,045 INFO L375 BasicCegarLoop]: trace histogram [19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:47,045 INFO L424 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:47,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:47,045 INFO L82 PathProgramCache]: Analyzing trace with hash -477047232, now seen corresponding path program 35 times [2018-10-24 12:34:47,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:47,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:47,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:47,047 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:47,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:47,692 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:34:47,692 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:47,692 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:47,692 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:47,693 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:47,693 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:47,693 INFO L194 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 [2018-10-24 12:34:47,699 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:47,699 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:47,772 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2018-10-24 12:34:47,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:47,779 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:47,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:34:47,817 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:48,397 INFO L134 CoverageAnalysis]: Checked inductivity of 1656 backedges. 702 proven. 342 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:34:48,417 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:48,417 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 41 [2018-10-24 12:34:48,417 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:48,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:34:48,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:34:48,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=1219, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:34:48,419 INFO L87 Difference]: Start difference. First operand 197 states and 198 transitions. Second operand 41 states. [2018-10-24 12:34:49,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:49,495 INFO L93 Difference]: Finished difference Result 284 states and 304 transitions. [2018-10-24 12:34:49,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:34:49,495 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 194 [2018-10-24 12:34:49,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:49,497 INFO L225 Difference]: With dead ends: 284 [2018-10-24 12:34:49,497 INFO L226 Difference]: Without dead ends: 199 [2018-10-24 12:34:49,498 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 351 SyntacticMatches, 38 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1215 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=881, Invalid=2779, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:34:49,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-10-24 12:34:49,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2018-10-24 12:34:49,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-10-24 12:34:49,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 200 transitions. [2018-10-24 12:34:49,508 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 200 transitions. Word has length 194 [2018-10-24 12:34:49,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:49,508 INFO L481 AbstractCegarLoop]: Abstraction has 199 states and 200 transitions. [2018-10-24 12:34:49,508 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:34:49,508 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 200 transitions. [2018-10-24 12:34:49,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2018-10-24 12:34:49,509 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:49,509 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:49,510 INFO L424 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:49,510 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:49,510 INFO L82 PathProgramCache]: Analyzing trace with hash 581280570, now seen corresponding path program 36 times [2018-10-24 12:34:49,510 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:49,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:49,511 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:49,511 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:49,511 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:49,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:50,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 415 proven. 718 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2018-10-24 12:34:50,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:50,070 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:50,070 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:50,070 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:50,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:50,071 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:50,078 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:50,078 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:50,129 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:50,129 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:50,133 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:50,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:34:50,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:50,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1694 backedges. 416 proven. 666 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2018-10-24 12:34:50,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:50,750 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 27 [2018-10-24 12:34:50,750 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:50,750 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-24 12:34:50,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-24 12:34:50,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=459, Unknown=0, NotChecked=0, Total=702 [2018-10-24 12:34:50,751 INFO L87 Difference]: Start difference. First operand 199 states and 200 transitions. Second operand 27 states. [2018-10-24 12:34:50,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:50,979 INFO L93 Difference]: Finished difference Result 209 states and 210 transitions. [2018-10-24 12:34:50,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-24 12:34:50,979 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 196 [2018-10-24 12:34:50,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:50,981 INFO L225 Difference]: With dead ends: 209 [2018-10-24 12:34:50,981 INFO L226 Difference]: Without dead ends: 207 [2018-10-24 12:34:50,982 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 372 SyntacticMatches, 39 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=256, Invalid=556, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:34:50,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-10-24 12:34:50,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2018-10-24 12:34:50,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 207 states. [2018-10-24 12:34:50,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 208 transitions. [2018-10-24 12:34:50,990 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 208 transitions. Word has length 196 [2018-10-24 12:34:50,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:50,991 INFO L481 AbstractCegarLoop]: Abstraction has 207 states and 208 transitions. [2018-10-24 12:34:50,991 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-24 12:34:50,991 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 208 transitions. [2018-10-24 12:34:50,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2018-10-24 12:34:50,992 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:50,993 INFO L375 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:50,993 INFO L424 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:50,993 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:50,993 INFO L82 PathProgramCache]: Analyzing trace with hash -159505539, now seen corresponding path program 37 times [2018-10-24 12:34:50,993 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:50,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:50,994 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:50,994 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:50,994 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:51,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:52,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:34:52,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:52,104 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:52,104 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:52,104 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:52,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:52,104 INFO L194 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 [2018-10-24 12:34:52,116 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:52,116 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:34:52,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:52,176 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:52,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:34:52,211 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:52,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1843 backedges. 779 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:34:52,822 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:52,822 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 43 [2018-10-24 12:34:52,822 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:52,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:34:52,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:34:52,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1343, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:34:52,823 INFO L87 Difference]: Start difference. First operand 207 states and 208 transitions. Second operand 43 states. [2018-10-24 12:34:54,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:54,060 INFO L93 Difference]: Finished difference Result 298 states and 319 transitions. [2018-10-24 12:34:54,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:34:54,062 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 204 [2018-10-24 12:34:54,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:54,063 INFO L225 Difference]: With dead ends: 298 [2018-10-24 12:34:54,064 INFO L226 Difference]: Without dead ends: 209 [2018-10-24 12:34:54,065 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 369 SyntacticMatches, 40 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1349 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=967, Invalid=3065, Unknown=0, NotChecked=0, Total=4032 [2018-10-24 12:34:54,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2018-10-24 12:34:54,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 209. [2018-10-24 12:34:54,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 209 states. [2018-10-24 12:34:54,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 210 transitions. [2018-10-24 12:34:54,075 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 210 transitions. Word has length 204 [2018-10-24 12:34:54,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:54,075 INFO L481 AbstractCegarLoop]: Abstraction has 209 states and 210 transitions. [2018-10-24 12:34:54,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:34:54,075 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 210 transitions. [2018-10-24 12:34:54,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-10-24 12:34:54,077 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:54,077 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:54,077 INFO L424 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:54,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:54,077 INFO L82 PathProgramCache]: Analyzing trace with hash 307920887, now seen corresponding path program 38 times [2018-10-24 12:34:54,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:54,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:54,078 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:34:54,078 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:54,078 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:54,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:55,275 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 457 proven. 796 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-10-24 12:34:55,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:55,275 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:55,275 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:55,275 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:55,275 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:55,276 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:34:55,282 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:34:55,282 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:34:55,390 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-24 12:34:55,391 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:55,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:55,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:34:55,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:56,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1883 backedges. 458 proven. 741 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2018-10-24 12:34:56,121 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:56,121 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 25] total 28 [2018-10-24 12:34:56,121 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:56,121 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-24 12:34:56,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-24 12:34:56,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=491, Unknown=0, NotChecked=0, Total=756 [2018-10-24 12:34:56,122 INFO L87 Difference]: Start difference. First operand 209 states and 210 transitions. Second operand 28 states. [2018-10-24 12:34:56,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:56,384 INFO L93 Difference]: Finished difference Result 219 states and 220 transitions. [2018-10-24 12:34:56,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-24 12:34:56,385 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 206 [2018-10-24 12:34:56,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:56,387 INFO L225 Difference]: With dead ends: 219 [2018-10-24 12:34:56,387 INFO L226 Difference]: Without dead ends: 217 [2018-10-24 12:34:56,387 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 391 SyntacticMatches, 41 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=278, Invalid=592, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:34:56,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2018-10-24 12:34:56,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 217. [2018-10-24 12:34:56,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 217 states. [2018-10-24 12:34:56,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 218 transitions. [2018-10-24 12:34:56,397 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 218 transitions. Word has length 206 [2018-10-24 12:34:56,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:56,397 INFO L481 AbstractCegarLoop]: Abstraction has 217 states and 218 transitions. [2018-10-24 12:34:56,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-24 12:34:56,397 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 218 transitions. [2018-10-24 12:34:56,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2018-10-24 12:34:56,399 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:56,399 INFO L375 BasicCegarLoop]: trace histogram [21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:56,399 INFO L424 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:56,399 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:56,399 INFO L82 PathProgramCache]: Analyzing trace with hash 941421370, now seen corresponding path program 39 times [2018-10-24 12:34:56,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:56,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:56,400 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:56,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:56,401 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:56,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:34:57,148 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:34:57,148 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:57,149 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:34:57,149 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:34:57,149 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:34:57,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:34:57,149 INFO L194 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 [2018-10-24 12:34:57,157 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:34:57,157 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:34:57,215 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:34:57,215 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:34:57,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:34:57,263 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:34:57,263 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:34:57,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2040 backedges. 860 proven. 420 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:34:57,970 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:34:57,970 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 45 [2018-10-24 12:34:57,970 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:34:57,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:34:57,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:34:57,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=1473, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:34:57,971 INFO L87 Difference]: Start difference. First operand 217 states and 218 transitions. Second operand 45 states. [2018-10-24 12:34:59,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:34:59,394 INFO L93 Difference]: Finished difference Result 312 states and 334 transitions. [2018-10-24 12:34:59,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:34:59,394 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 214 [2018-10-24 12:34:59,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:34:59,395 INFO L225 Difference]: With dead ends: 312 [2018-10-24 12:34:59,395 INFO L226 Difference]: Without dead ends: 219 [2018-10-24 12:34:59,397 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 494 GetRequests, 387 SyntacticMatches, 42 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1057, Invalid=3365, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:34:59,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-10-24 12:34:59,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 219. [2018-10-24 12:34:59,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 219 states. [2018-10-24 12:34:59,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 220 transitions. [2018-10-24 12:34:59,408 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 220 transitions. Word has length 214 [2018-10-24 12:34:59,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:34:59,408 INFO L481 AbstractCegarLoop]: Abstraction has 219 states and 220 transitions. [2018-10-24 12:34:59,408 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:34:59,409 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 220 transitions. [2018-10-24 12:34:59,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2018-10-24 12:34:59,410 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:34:59,410 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:34:59,410 INFO L424 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:34:59,410 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:34:59,411 INFO L82 PathProgramCache]: Analyzing trace with hash 1446215476, now seen corresponding path program 40 times [2018-10-24 12:34:59,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:34:59,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:59,412 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:34:59,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:34:59,412 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:34:59,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:01,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 501 proven. 878 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2018-10-24 12:35:01,372 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:01,373 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:01,373 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:01,373 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:01,373 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:01,373 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:01,387 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:01,387 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:01,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:01,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:01,534 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:35:01,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:01,969 INFO L134 CoverageAnalysis]: Checked inductivity of 2082 backedges. 502 proven. 820 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2018-10-24 12:35:01,989 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:01,989 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 29 [2018-10-24 12:35:01,989 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:01,990 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-24 12:35:01,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-24 12:35:01,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=524, Unknown=0, NotChecked=0, Total=812 [2018-10-24 12:35:01,990 INFO L87 Difference]: Start difference. First operand 219 states and 220 transitions. Second operand 29 states. [2018-10-24 12:35:02,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:02,538 INFO L93 Difference]: Finished difference Result 229 states and 230 transitions. [2018-10-24 12:35:02,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-24 12:35:02,539 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 216 [2018-10-24 12:35:02,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:02,541 INFO L225 Difference]: With dead ends: 229 [2018-10-24 12:35:02,541 INFO L226 Difference]: Without dead ends: 227 [2018-10-24 12:35:02,541 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 410 SyntacticMatches, 43 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=301, Invalid=629, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:35:02,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-10-24 12:35:02,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 227. [2018-10-24 12:35:02,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 227 states. [2018-10-24 12:35:02,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 228 transitions. [2018-10-24 12:35:02,551 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 228 transitions. Word has length 216 [2018-10-24 12:35:02,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:02,552 INFO L481 AbstractCegarLoop]: Abstraction has 227 states and 228 transitions. [2018-10-24 12:35:02,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-24 12:35:02,552 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 228 transitions. [2018-10-24 12:35:02,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2018-10-24 12:35:02,553 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:02,553 INFO L375 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:02,553 INFO L424 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:02,554 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:02,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1563073161, now seen corresponding path program 41 times [2018-10-24 12:35:02,554 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:02,554 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:02,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:02,555 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:02,555 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:02,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:03,577 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:03,577 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:03,578 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:03,578 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:03,578 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:03,578 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:03,578 INFO L194 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 [2018-10-24 12:35:03,592 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:03,592 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:03,722 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-10-24 12:35:03,722 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:03,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:03,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:03,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:04,417 INFO L134 CoverageAnalysis]: Checked inductivity of 2247 backedges. 945 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:04,437 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:04,437 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 47 [2018-10-24 12:35:04,437 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:04,438 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:35:04,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:35:04,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=553, Invalid=1609, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:35:04,439 INFO L87 Difference]: Start difference. First operand 227 states and 228 transitions. Second operand 47 states. [2018-10-24 12:35:06,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:06,156 INFO L93 Difference]: Finished difference Result 326 states and 349 transitions. [2018-10-24 12:35:06,156 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:35:06,156 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 224 [2018-10-24 12:35:06,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:06,157 INFO L225 Difference]: With dead ends: 326 [2018-10-24 12:35:06,157 INFO L226 Difference]: Without dead ends: 229 [2018-10-24 12:35:06,158 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 405 SyntacticMatches, 44 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1638 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1151, Invalid=3679, Unknown=0, NotChecked=0, Total=4830 [2018-10-24 12:35:06,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2018-10-24 12:35:06,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 229. [2018-10-24 12:35:06,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2018-10-24 12:35:06,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 230 transitions. [2018-10-24 12:35:06,169 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 230 transitions. Word has length 224 [2018-10-24 12:35:06,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:06,169 INFO L481 AbstractCegarLoop]: Abstraction has 229 states and 230 transitions. [2018-10-24 12:35:06,169 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:35:06,170 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 230 transitions. [2018-10-24 12:35:06,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2018-10-24 12:35:06,171 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:06,171 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:06,171 INFO L424 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:06,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:06,171 INFO L82 PathProgramCache]: Analyzing trace with hash 835764465, now seen corresponding path program 42 times [2018-10-24 12:35:06,172 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:06,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:06,172 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:06,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:06,173 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:06,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:06,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 547 proven. 964 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2018-10-24 12:35:06,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:06,734 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:06,734 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:06,735 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:06,735 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:06,735 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:06,743 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:06,743 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:06,810 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:06,810 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:06,813 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:06,900 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:06,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:07,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2291 backedges. 548 proven. 903 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2018-10-24 12:35:07,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:07,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 27] total 30 [2018-10-24 12:35:07,378 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:07,378 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-24 12:35:07,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-24 12:35:07,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=558, Unknown=0, NotChecked=0, Total=870 [2018-10-24 12:35:07,379 INFO L87 Difference]: Start difference. First operand 229 states and 230 transitions. Second operand 30 states. [2018-10-24 12:35:07,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:07,664 INFO L93 Difference]: Finished difference Result 239 states and 240 transitions. [2018-10-24 12:35:07,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-24 12:35:07,665 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 226 [2018-10-24 12:35:07,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:07,667 INFO L225 Difference]: With dead ends: 239 [2018-10-24 12:35:07,667 INFO L226 Difference]: Without dead ends: 237 [2018-10-24 12:35:07,667 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 429 SyntacticMatches, 45 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=325, Invalid=667, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:35:07,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2018-10-24 12:35:07,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 237. [2018-10-24 12:35:07,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 237 states. [2018-10-24 12:35:07,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 238 transitions. [2018-10-24 12:35:07,677 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 238 transitions. Word has length 226 [2018-10-24 12:35:07,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:07,678 INFO L481 AbstractCegarLoop]: Abstraction has 237 states and 238 transitions. [2018-10-24 12:35:07,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-24 12:35:07,678 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 238 transitions. [2018-10-24 12:35:07,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 235 [2018-10-24 12:35:07,679 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:07,679 INFO L375 BasicCegarLoop]: trace histogram [23, 23, 23, 23, 23, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:07,680 INFO L424 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:07,680 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:07,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1747425844, now seen corresponding path program 43 times [2018-10-24 12:35:07,680 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:07,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:07,681 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:07,681 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:07,681 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:07,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:08,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:35:08,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:08,859 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:08,859 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:08,859 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:08,859 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:08,859 INFO L194 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 [2018-10-24 12:35:08,870 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:08,870 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:08,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:08,939 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:08,978 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:35:08,978 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:09,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2464 backedges. 1034 proven. 506 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:35:09,723 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:09,723 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 49 [2018-10-24 12:35:09,723 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:09,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:35:09,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:35:09,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=1751, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:35:09,724 INFO L87 Difference]: Start difference. First operand 237 states and 238 transitions. Second operand 49 states. [2018-10-24 12:35:11,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:11,297 INFO L93 Difference]: Finished difference Result 340 states and 364 transitions. [2018-10-24 12:35:11,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:35:11,297 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 234 [2018-10-24 12:35:11,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:11,298 INFO L225 Difference]: With dead ends: 340 [2018-10-24 12:35:11,299 INFO L226 Difference]: Without dead ends: 239 [2018-10-24 12:35:11,300 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 423 SyntacticMatches, 46 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1793 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1249, Invalid=4007, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:35:11,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2018-10-24 12:35:11,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 239. [2018-10-24 12:35:11,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2018-10-24 12:35:11,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 240 transitions. [2018-10-24 12:35:11,311 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 240 transitions. Word has length 234 [2018-10-24 12:35:11,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:11,311 INFO L481 AbstractCegarLoop]: Abstraction has 239 states and 240 transitions. [2018-10-24 12:35:11,311 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:35:11,311 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 240 transitions. [2018-10-24 12:35:11,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2018-10-24 12:35:11,312 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:11,313 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:11,313 INFO L424 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:11,313 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:11,313 INFO L82 PathProgramCache]: Analyzing trace with hash -102079186, now seen corresponding path program 44 times [2018-10-24 12:35:11,313 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:11,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,314 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:11,314 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:11,314 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:11,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:12,277 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 595 proven. 1054 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-10-24 12:35:12,277 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:12,277 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:12,278 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:12,278 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:12,278 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:12,278 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:12,286 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:12,286 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:12,373 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-24 12:35:12,373 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:12,377 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:12,502 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:35:12,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:13,523 INFO L134 CoverageAnalysis]: Checked inductivity of 2510 backedges. 596 proven. 990 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2018-10-24 12:35:13,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:13,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 31 [2018-10-24 12:35:13,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:13,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-24 12:35:13,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-24 12:35:13,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=593, Unknown=0, NotChecked=0, Total=930 [2018-10-24 12:35:13,544 INFO L87 Difference]: Start difference. First operand 239 states and 240 transitions. Second operand 31 states. [2018-10-24 12:35:13,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:13,884 INFO L93 Difference]: Finished difference Result 249 states and 250 transitions. [2018-10-24 12:35:13,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-24 12:35:13,885 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 236 [2018-10-24 12:35:13,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:13,887 INFO L225 Difference]: With dead ends: 249 [2018-10-24 12:35:13,887 INFO L226 Difference]: Without dead ends: 247 [2018-10-24 12:35:13,887 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 448 SyntacticMatches, 47 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=350, Invalid=706, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:35:13,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-10-24 12:35:13,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 247. [2018-10-24 12:35:13,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2018-10-24 12:35:13,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 248 transitions. [2018-10-24 12:35:13,897 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 248 transitions. Word has length 236 [2018-10-24 12:35:13,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:13,898 INFO L481 AbstractCegarLoop]: Abstraction has 247 states and 248 transitions. [2018-10-24 12:35:13,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-24 12:35:13,898 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 248 transitions. [2018-10-24 12:35:13,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2018-10-24 12:35:13,899 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:13,900 INFO L375 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:13,900 INFO L424 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:13,900 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:13,900 INFO L82 PathProgramCache]: Analyzing trace with hash 850112881, now seen corresponding path program 45 times [2018-10-24 12:35:13,900 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:13,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:13,901 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:13,901 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:13,901 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:13,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:14,762 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:14,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:14,762 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:14,762 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:14,762 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:14,762 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:14,762 INFO L194 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 [2018-10-24 12:35:14,769 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:14,770 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:14,839 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:14,839 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:14,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:14,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:14,898 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:16,523 INFO L134 CoverageAnalysis]: Checked inductivity of 2691 backedges. 1127 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:16,543 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:16,543 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 51 [2018-10-24 12:35:16,543 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:16,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-10-24 12:35:16,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-10-24 12:35:16,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1899, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:35:16,544 INFO L87 Difference]: Start difference. First operand 247 states and 248 transitions. Second operand 51 states. [2018-10-24 12:35:17,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:17,383 INFO L93 Difference]: Finished difference Result 354 states and 379 transitions. [2018-10-24 12:35:17,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-10-24 12:35:17,384 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 244 [2018-10-24 12:35:17,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:17,385 INFO L225 Difference]: With dead ends: 354 [2018-10-24 12:35:17,385 INFO L226 Difference]: Without dead ends: 249 [2018-10-24 12:35:17,386 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 563 GetRequests, 441 SyntacticMatches, 48 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1955 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1351, Invalid=4349, Unknown=0, NotChecked=0, Total=5700 [2018-10-24 12:35:17,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-10-24 12:35:17,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 249. [2018-10-24 12:35:17,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-10-24 12:35:17,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 250 transitions. [2018-10-24 12:35:17,397 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 250 transitions. Word has length 244 [2018-10-24 12:35:17,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:17,397 INFO L481 AbstractCegarLoop]: Abstraction has 249 states and 250 transitions. [2018-10-24 12:35:17,398 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-10-24 12:35:17,398 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 250 transitions. [2018-10-24 12:35:17,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2018-10-24 12:35:17,399 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:17,399 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:17,399 INFO L424 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:17,399 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:17,399 INFO L82 PathProgramCache]: Analyzing trace with hash -699364373, now seen corresponding path program 46 times [2018-10-24 12:35:17,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:17,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:17,400 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:17,400 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:17,400 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:17,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:18,074 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 645 proven. 1148 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2018-10-24 12:35:18,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:18,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:18,074 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:18,074 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:18,074 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:18,074 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:18,081 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:18,081 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:18,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:18,151 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:18,277 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:18,277 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:18,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2739 backedges. 646 proven. 1081 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2018-10-24 12:35:18,880 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:18,881 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 32 [2018-10-24 12:35:18,881 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:18,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-24 12:35:18,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-24 12:35:18,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=629, Unknown=0, NotChecked=0, Total=992 [2018-10-24 12:35:18,882 INFO L87 Difference]: Start difference. First operand 249 states and 250 transitions. Second operand 32 states. [2018-10-24 12:35:19,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:19,234 INFO L93 Difference]: Finished difference Result 259 states and 260 transitions. [2018-10-24 12:35:19,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-24 12:35:19,234 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 246 [2018-10-24 12:35:19,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:19,236 INFO L225 Difference]: With dead ends: 259 [2018-10-24 12:35:19,236 INFO L226 Difference]: Without dead ends: 257 [2018-10-24 12:35:19,238 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 548 GetRequests, 467 SyntacticMatches, 49 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=376, Invalid=746, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:35:19,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2018-10-24 12:35:19,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 257. [2018-10-24 12:35:19,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 257 states. [2018-10-24 12:35:19,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 258 transitions. [2018-10-24 12:35:19,248 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 258 transitions. Word has length 246 [2018-10-24 12:35:19,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:19,249 INFO L481 AbstractCegarLoop]: Abstraction has 257 states and 258 transitions. [2018-10-24 12:35:19,249 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-24 12:35:19,249 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 258 transitions. [2018-10-24 12:35:19,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 255 [2018-10-24 12:35:19,250 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:19,251 INFO L375 BasicCegarLoop]: trace histogram [25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:19,251 INFO L424 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:19,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:19,251 INFO L82 PathProgramCache]: Analyzing trace with hash -401487058, now seen corresponding path program 47 times [2018-10-24 12:35:19,251 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:19,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:19,252 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:19,252 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:19,252 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:19,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:20,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:35:20,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:20,342 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:20,342 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:20,342 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:20,342 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:20,342 INFO L194 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 [2018-10-24 12:35:20,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:20,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:20,449 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-10-24 12:35:20,449 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:20,452 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:20,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:35:20,516 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:21,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2928 backedges. 1224 proven. 600 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:35:21,584 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:21,584 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 53 [2018-10-24 12:35:21,584 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:21,585 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-10-24 12:35:21,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-10-24 12:35:21,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=2053, Unknown=0, NotChecked=0, Total=2756 [2018-10-24 12:35:21,585 INFO L87 Difference]: Start difference. First operand 257 states and 258 transitions. Second operand 53 states. [2018-10-24 12:35:23,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:23,380 INFO L93 Difference]: Finished difference Result 368 states and 394 transitions. [2018-10-24 12:35:23,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-10-24 12:35:23,380 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 254 [2018-10-24 12:35:23,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:23,381 INFO L225 Difference]: With dead ends: 368 [2018-10-24 12:35:23,382 INFO L226 Difference]: Without dead ends: 259 [2018-10-24 12:35:23,383 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 586 GetRequests, 459 SyntacticMatches, 50 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2124 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1457, Invalid=4705, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:35:23,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2018-10-24 12:35:23,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2018-10-24 12:35:23,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 259 states. [2018-10-24 12:35:23,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 260 transitions. [2018-10-24 12:35:23,394 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 260 transitions. Word has length 254 [2018-10-24 12:35:23,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:23,394 INFO L481 AbstractCegarLoop]: Abstraction has 259 states and 260 transitions. [2018-10-24 12:35:23,394 INFO L482 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-10-24 12:35:23,394 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 260 transitions. [2018-10-24 12:35:23,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 257 [2018-10-24 12:35:23,396 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:23,396 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:23,396 INFO L424 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:23,396 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:23,396 INFO L82 PathProgramCache]: Analyzing trace with hash 65754408, now seen corresponding path program 48 times [2018-10-24 12:35:23,396 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:23,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:23,397 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:23,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:23,397 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:23,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:23,882 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 697 proven. 1246 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2018-10-24 12:35:23,882 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:23,882 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:23,883 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:23,883 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:23,883 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:23,883 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:23,889 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:23,890 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:23,965 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:23,965 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:23,969 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:24,441 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:35:24,441 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:25,009 INFO L134 CoverageAnalysis]: Checked inductivity of 2978 backedges. 698 proven. 1176 refuted. 0 times theorem prover too weak. 1104 trivial. 0 not checked. [2018-10-24 12:35:25,029 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:25,029 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 33 [2018-10-24 12:35:25,029 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:25,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-24 12:35:25,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-24 12:35:25,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=390, Invalid=666, Unknown=0, NotChecked=0, Total=1056 [2018-10-24 12:35:25,030 INFO L87 Difference]: Start difference. First operand 259 states and 260 transitions. Second operand 33 states. [2018-10-24 12:35:25,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:25,364 INFO L93 Difference]: Finished difference Result 269 states and 270 transitions. [2018-10-24 12:35:25,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-24 12:35:25,365 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 256 [2018-10-24 12:35:25,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:25,367 INFO L225 Difference]: With dead ends: 269 [2018-10-24 12:35:25,367 INFO L226 Difference]: Without dead ends: 267 [2018-10-24 12:35:25,368 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 486 SyntacticMatches, 51 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=403, Invalid=787, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:35:25,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2018-10-24 12:35:25,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 267. [2018-10-24 12:35:25,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2018-10-24 12:35:25,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 268 transitions. [2018-10-24 12:35:25,378 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 268 transitions. Word has length 256 [2018-10-24 12:35:25,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:25,379 INFO L481 AbstractCegarLoop]: Abstraction has 267 states and 268 transitions. [2018-10-24 12:35:25,379 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-24 12:35:25,379 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 268 transitions. [2018-10-24 12:35:25,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-10-24 12:35:25,381 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:25,381 INFO L375 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:25,381 INFO L424 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:25,381 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:25,381 INFO L82 PathProgramCache]: Analyzing trace with hash -350091413, now seen corresponding path program 49 times [2018-10-24 12:35:25,381 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:25,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:25,382 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:25,382 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:25,382 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:25,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:26,835 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:26,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:26,835 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:26,836 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:26,836 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:26,836 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:26,836 INFO L194 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 [2018-10-24 12:35:26,843 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:26,843 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:26,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:26,922 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:26,968 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:26,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:27,804 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1325 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:27,824 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:27,824 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 55 [2018-10-24 12:35:27,824 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:27,824 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2018-10-24 12:35:27,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2018-10-24 12:35:27,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=757, Invalid=2213, Unknown=0, NotChecked=0, Total=2970 [2018-10-24 12:35:27,826 INFO L87 Difference]: Start difference. First operand 267 states and 268 transitions. Second operand 55 states. [2018-10-24 12:35:29,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:29,434 INFO L93 Difference]: Finished difference Result 382 states and 409 transitions. [2018-10-24 12:35:29,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2018-10-24 12:35:29,436 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 264 [2018-10-24 12:35:29,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:29,438 INFO L225 Difference]: With dead ends: 382 [2018-10-24 12:35:29,438 INFO L226 Difference]: Without dead ends: 269 [2018-10-24 12:35:29,439 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 609 GetRequests, 477 SyntacticMatches, 52 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2300 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1567, Invalid=5075, Unknown=0, NotChecked=0, Total=6642 [2018-10-24 12:35:29,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 269 states. [2018-10-24 12:35:29,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 269 to 269. [2018-10-24 12:35:29,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2018-10-24 12:35:29,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 270 transitions. [2018-10-24 12:35:29,451 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 270 transitions. Word has length 264 [2018-10-24 12:35:29,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:29,451 INFO L481 AbstractCegarLoop]: Abstraction has 269 states and 270 transitions. [2018-10-24 12:35:29,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 55 states. [2018-10-24 12:35:29,452 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 270 transitions. [2018-10-24 12:35:29,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2018-10-24 12:35:29,453 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:29,453 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:29,453 INFO L424 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:29,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:29,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1766137627, now seen corresponding path program 50 times [2018-10-24 12:35:29,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:29,454 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:29,455 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:29,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:29,455 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:29,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:29,906 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 751 proven. 1348 refuted. 0 times theorem prover too weak. 1128 trivial. 0 not checked. [2018-10-24 12:35:29,907 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:29,907 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:29,907 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:29,907 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:29,907 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:29,907 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:29,915 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:29,915 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:30,021 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-24 12:35:30,021 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:30,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:30,117 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:30,118 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:30,938 INFO L134 CoverageAnalysis]: Checked inductivity of 3227 backedges. 752 proven. 1275 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2018-10-24 12:35:30,958 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:30,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 34 [2018-10-24 12:35:30,959 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:30,959 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-24 12:35:30,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-24 12:35:30,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=704, Unknown=0, NotChecked=0, Total=1122 [2018-10-24 12:35:30,960 INFO L87 Difference]: Start difference. First operand 269 states and 270 transitions. Second operand 34 states. [2018-10-24 12:35:31,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:31,452 INFO L93 Difference]: Finished difference Result 279 states and 280 transitions. [2018-10-24 12:35:31,453 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-24 12:35:31,453 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 266 [2018-10-24 12:35:31,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:31,455 INFO L225 Difference]: With dead ends: 279 [2018-10-24 12:35:31,455 INFO L226 Difference]: Without dead ends: 277 [2018-10-24 12:35:31,455 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 505 SyntacticMatches, 53 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 888 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=431, Invalid=829, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:35:31,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2018-10-24 12:35:31,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 277. [2018-10-24 12:35:31,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 277 states. [2018-10-24 12:35:31,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 278 transitions. [2018-10-24 12:35:31,466 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 278 transitions. Word has length 266 [2018-10-24 12:35:31,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:31,466 INFO L481 AbstractCegarLoop]: Abstraction has 277 states and 278 transitions. [2018-10-24 12:35:31,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-24 12:35:31,467 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 278 transitions. [2018-10-24 12:35:31,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2018-10-24 12:35:31,468 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:31,468 INFO L375 BasicCegarLoop]: trace histogram [27, 27, 27, 27, 27, 26, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:31,469 INFO L424 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:31,469 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:31,469 INFO L82 PathProgramCache]: Analyzing trace with hash -574847448, now seen corresponding path program 51 times [2018-10-24 12:35:31,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:31,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:31,470 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:31,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:31,470 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:31,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:32,446 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:35:32,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:32,446 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:32,446 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:32,446 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:32,446 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:32,446 INFO L194 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 [2018-10-24 12:35:32,454 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:32,454 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:32,534 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:32,535 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:32,540 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:32,607 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:35:32,607 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:33,895 INFO L134 CoverageAnalysis]: Checked inductivity of 3432 backedges. 1430 proven. 702 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:35:33,915 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:33,916 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57] total 57 [2018-10-24 12:35:33,916 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:33,916 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-10-24 12:35:33,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-10-24 12:35:33,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=813, Invalid=2379, Unknown=0, NotChecked=0, Total=3192 [2018-10-24 12:35:33,917 INFO L87 Difference]: Start difference. First operand 277 states and 278 transitions. Second operand 57 states. [2018-10-24 12:35:35,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:35,439 INFO L93 Difference]: Finished difference Result 396 states and 424 transitions. [2018-10-24 12:35:35,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-10-24 12:35:35,439 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 274 [2018-10-24 12:35:35,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:35,440 INFO L225 Difference]: With dead ends: 396 [2018-10-24 12:35:35,440 INFO L226 Difference]: Without dead ends: 279 [2018-10-24 12:35:35,442 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 495 SyntacticMatches, 54 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2483 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1681, Invalid=5459, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:35:35,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2018-10-24 12:35:35,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 279. [2018-10-24 12:35:35,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 279 states. [2018-10-24 12:35:35,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 280 transitions. [2018-10-24 12:35:35,453 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 280 transitions. Word has length 274 [2018-10-24 12:35:35,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:35,453 INFO L481 AbstractCegarLoop]: Abstraction has 279 states and 280 transitions. [2018-10-24 12:35:35,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-10-24 12:35:35,454 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 280 transitions. [2018-10-24 12:35:35,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2018-10-24 12:35:35,455 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:35,455 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 27, 27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:35,456 INFO L424 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:35,456 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:35,456 INFO L82 PathProgramCache]: Analyzing trace with hash -1143517406, now seen corresponding path program 52 times [2018-10-24 12:35:35,456 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:35,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:35,457 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:35,457 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:35,457 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:35,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:36,006 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 807 proven. 1454 refuted. 0 times theorem prover too weak. 1225 trivial. 0 not checked. [2018-10-24 12:35:36,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:36,006 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:36,006 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:36,006 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:36,006 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:36,007 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:36,014 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:36,014 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:36,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:36,095 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:36,231 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:35:36,231 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:36,987 INFO L134 CoverageAnalysis]: Checked inductivity of 3486 backedges. 808 proven. 1378 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2018-10-24 12:35:37,007 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:37,007 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 35 [2018-10-24 12:35:37,007 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:37,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-24 12:35:37,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-24 12:35:37,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=743, Unknown=0, NotChecked=0, Total=1190 [2018-10-24 12:35:37,008 INFO L87 Difference]: Start difference. First operand 279 states and 280 transitions. Second operand 35 states. [2018-10-24 12:35:37,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:37,450 INFO L93 Difference]: Finished difference Result 289 states and 290 transitions. [2018-10-24 12:35:37,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-24 12:35:37,450 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 276 [2018-10-24 12:35:37,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:37,453 INFO L225 Difference]: With dead ends: 289 [2018-10-24 12:35:37,453 INFO L226 Difference]: Without dead ends: 287 [2018-10-24 12:35:37,453 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 524 SyntacticMatches, 55 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=460, Invalid=872, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:35:37,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-10-24 12:35:37,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 287. [2018-10-24 12:35:37,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2018-10-24 12:35:37,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 288 transitions. [2018-10-24 12:35:37,464 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 288 transitions. Word has length 276 [2018-10-24 12:35:37,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:37,464 INFO L481 AbstractCegarLoop]: Abstraction has 287 states and 288 transitions. [2018-10-24 12:35:37,464 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-24 12:35:37,464 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 288 transitions. [2018-10-24 12:35:37,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-10-24 12:35:37,466 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:37,466 INFO L375 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:37,466 INFO L424 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:37,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:37,467 INFO L82 PathProgramCache]: Analyzing trace with hash -489068699, now seen corresponding path program 53 times [2018-10-24 12:35:37,467 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:37,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:37,468 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:37,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:37,468 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:37,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:38,514 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:38,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:38,514 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:38,514 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:38,514 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:38,514 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:38,514 INFO L194 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) [2018-10-24 12:35:38,524 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:38,524 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:38,629 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2018-10-24 12:35:38,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:38,635 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:38,687 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:38,687 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:39,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3699 backedges. 1539 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:39,718 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:39,718 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 59 [2018-10-24 12:35:39,718 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:39,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2018-10-24 12:35:39,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2018-10-24 12:35:39,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=871, Invalid=2551, Unknown=0, NotChecked=0, Total=3422 [2018-10-24 12:35:39,719 INFO L87 Difference]: Start difference. First operand 287 states and 288 transitions. Second operand 59 states. [2018-10-24 12:35:41,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:41,026 INFO L93 Difference]: Finished difference Result 410 states and 439 transitions. [2018-10-24 12:35:41,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2018-10-24 12:35:41,026 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 284 [2018-10-24 12:35:41,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:41,028 INFO L225 Difference]: With dead ends: 410 [2018-10-24 12:35:41,028 INFO L226 Difference]: Without dead ends: 289 [2018-10-24 12:35:41,029 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 513 SyntacticMatches, 56 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2673 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1799, Invalid=5857, Unknown=0, NotChecked=0, Total=7656 [2018-10-24 12:35:41,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2018-10-24 12:35:41,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2018-10-24 12:35:41,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 289 states. [2018-10-24 12:35:41,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 290 transitions. [2018-10-24 12:35:41,041 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 290 transitions. Word has length 284 [2018-10-24 12:35:41,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:41,041 INFO L481 AbstractCegarLoop]: Abstraction has 289 states and 290 transitions. [2018-10-24 12:35:41,041 INFO L482 AbstractCegarLoop]: Interpolant automaton has 59 states. [2018-10-24 12:35:41,041 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 290 transitions. [2018-10-24 12:35:41,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2018-10-24 12:35:41,044 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:41,044 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:41,044 INFO L424 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:41,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:41,045 INFO L82 PathProgramCache]: Analyzing trace with hash 2070986719, now seen corresponding path program 54 times [2018-10-24 12:35:41,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:41,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:41,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:41,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:41,046 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:41,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:41,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 865 proven. 1564 refuted. 0 times theorem prover too weak. 1326 trivial. 0 not checked. [2018-10-24 12:35:41,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:41,866 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:41,866 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:41,866 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:41,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:41,866 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:41,873 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:41,873 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:41,953 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:41,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:41,958 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:42,066 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:42,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:42,761 INFO L134 CoverageAnalysis]: Checked inductivity of 3755 backedges. 866 proven. 1485 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2018-10-24 12:35:42,781 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:42,782 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 33] total 36 [2018-10-24 12:35:42,782 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:42,782 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-10-24 12:35:42,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-10-24 12:35:42,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=783, Unknown=0, NotChecked=0, Total=1260 [2018-10-24 12:35:42,783 INFO L87 Difference]: Start difference. First operand 289 states and 290 transitions. Second operand 36 states. [2018-10-24 12:35:43,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:43,183 INFO L93 Difference]: Finished difference Result 299 states and 300 transitions. [2018-10-24 12:35:43,184 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-10-24 12:35:43,184 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 286 [2018-10-24 12:35:43,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:43,186 INFO L225 Difference]: With dead ends: 299 [2018-10-24 12:35:43,186 INFO L226 Difference]: Without dead ends: 297 [2018-10-24 12:35:43,187 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 636 GetRequests, 543 SyntacticMatches, 57 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1012 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=490, Invalid=916, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:35:43,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2018-10-24 12:35:43,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 297. [2018-10-24 12:35:43,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 297 states. [2018-10-24 12:35:43,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 298 transitions. [2018-10-24 12:35:43,196 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 298 transitions. Word has length 286 [2018-10-24 12:35:43,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:43,196 INFO L481 AbstractCegarLoop]: Abstraction has 297 states and 298 transitions. [2018-10-24 12:35:43,196 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-10-24 12:35:43,197 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 298 transitions. [2018-10-24 12:35:43,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2018-10-24 12:35:43,198 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:43,198 INFO L375 BasicCegarLoop]: trace histogram [29, 29, 29, 29, 29, 28, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:43,199 INFO L424 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:43,199 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:43,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1619577634, now seen corresponding path program 55 times [2018-10-24 12:35:43,199 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:43,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:43,200 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:43,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:43,200 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:43,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:44,385 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:35:44,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:44,386 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:44,386 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:44,386 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:44,386 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:44,386 INFO L194 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 [2018-10-24 12:35:44,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:44,393 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:44,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:44,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:44,554 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:35:44,554 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:45,588 INFO L134 CoverageAnalysis]: Checked inductivity of 3976 backedges. 1652 proven. 812 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:35:45,609 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:45,609 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 61 [2018-10-24 12:35:45,609 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:45,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2018-10-24 12:35:45,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2018-10-24 12:35:45,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=931, Invalid=2729, Unknown=0, NotChecked=0, Total=3660 [2018-10-24 12:35:45,610 INFO L87 Difference]: Start difference. First operand 297 states and 298 transitions. Second operand 61 states. [2018-10-24 12:35:46,022 WARN L179 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-10-24 12:35:47,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:47,928 INFO L93 Difference]: Finished difference Result 424 states and 454 transitions. [2018-10-24 12:35:47,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-10-24 12:35:47,928 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 294 [2018-10-24 12:35:47,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:47,930 INFO L225 Difference]: With dead ends: 424 [2018-10-24 12:35:47,930 INFO L226 Difference]: Without dead ends: 299 [2018-10-24 12:35:47,931 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 678 GetRequests, 531 SyntacticMatches, 58 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2870 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1921, Invalid=6269, Unknown=0, NotChecked=0, Total=8190 [2018-10-24 12:35:47,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-10-24 12:35:47,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 299. [2018-10-24 12:35:47,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 299 states. [2018-10-24 12:35:47,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 300 transitions. [2018-10-24 12:35:47,940 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 300 transitions. Word has length 294 [2018-10-24 12:35:47,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:47,940 INFO L481 AbstractCegarLoop]: Abstraction has 299 states and 300 transitions. [2018-10-24 12:35:47,940 INFO L482 AbstractCegarLoop]: Interpolant automaton has 61 states. [2018-10-24 12:35:47,940 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 300 transitions. [2018-10-24 12:35:47,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2018-10-24 12:35:47,942 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:47,942 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 29, 29, 29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:47,942 INFO L424 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:47,942 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:47,942 INFO L82 PathProgramCache]: Analyzing trace with hash -87076068, now seen corresponding path program 56 times [2018-10-24 12:35:47,942 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:47,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:47,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:47,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:47,943 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:47,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:48,662 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 925 proven. 1678 refuted. 0 times theorem prover too weak. 1431 trivial. 0 not checked. [2018-10-24 12:35:48,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:48,662 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:48,662 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:48,662 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:48,662 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:48,662 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:48,670 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:48,670 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:48,785 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-24 12:35:48,786 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:48,790 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:48,899 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:35:48,899 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:49,680 INFO L134 CoverageAnalysis]: Checked inductivity of 4034 backedges. 926 proven. 1596 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2018-10-24 12:35:49,700 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:49,700 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 37 [2018-10-24 12:35:49,700 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:49,701 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-10-24 12:35:49,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-10-24 12:35:49,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=824, Unknown=0, NotChecked=0, Total=1332 [2018-10-24 12:35:49,701 INFO L87 Difference]: Start difference. First operand 299 states and 300 transitions. Second operand 37 states. [2018-10-24 12:35:50,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:50,153 INFO L93 Difference]: Finished difference Result 309 states and 310 transitions. [2018-10-24 12:35:50,154 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-10-24 12:35:50,154 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 296 [2018-10-24 12:35:50,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:50,156 INFO L225 Difference]: With dead ends: 309 [2018-10-24 12:35:50,156 INFO L226 Difference]: Without dead ends: 307 [2018-10-24 12:35:50,157 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 562 SyntacticMatches, 59 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=521, Invalid=961, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:35:50,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-10-24 12:35:50,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 307. [2018-10-24 12:35:50,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 307 states. [2018-10-24 12:35:50,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 308 transitions. [2018-10-24 12:35:50,166 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 308 transitions. Word has length 296 [2018-10-24 12:35:50,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:50,166 INFO L481 AbstractCegarLoop]: Abstraction has 307 states and 308 transitions. [2018-10-24 12:35:50,166 INFO L482 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-10-24 12:35:50,166 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 308 transitions. [2018-10-24 12:35:50,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-10-24 12:35:50,167 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:50,167 INFO L375 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:50,167 INFO L424 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:50,168 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:50,168 INFO L82 PathProgramCache]: Analyzing trace with hash 1106432351, now seen corresponding path program 57 times [2018-10-24 12:35:50,168 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:50,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:50,168 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:50,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:50,168 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:50,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:51,362 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:35:51,362 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:51,362 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:51,362 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:51,363 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:51,363 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:51,363 INFO L194 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 [2018-10-24 12:35:51,370 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:35:51,370 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:35:51,456 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:35:51,457 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:51,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:51,525 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:35:51,525 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:52,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4263 backedges. 1769 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:35:52,883 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:52,884 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 63 [2018-10-24 12:35:52,884 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:52,898 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2018-10-24 12:35:52,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2018-10-24 12:35:52,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=993, Invalid=2913, Unknown=0, NotChecked=0, Total=3906 [2018-10-24 12:35:52,899 INFO L87 Difference]: Start difference. First operand 307 states and 308 transitions. Second operand 63 states. [2018-10-24 12:35:54,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:54,676 INFO L93 Difference]: Finished difference Result 438 states and 469 transitions. [2018-10-24 12:35:54,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2018-10-24 12:35:54,676 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 304 [2018-10-24 12:35:54,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:54,678 INFO L225 Difference]: With dead ends: 438 [2018-10-24 12:35:54,678 INFO L226 Difference]: Without dead ends: 309 [2018-10-24 12:35:54,679 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 701 GetRequests, 549 SyntacticMatches, 60 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3074 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2047, Invalid=6695, Unknown=0, NotChecked=0, Total=8742 [2018-10-24 12:35:54,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2018-10-24 12:35:54,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 309. [2018-10-24 12:35:54,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 309 states. [2018-10-24 12:35:54,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 310 transitions. [2018-10-24 12:35:54,692 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 310 transitions. Word has length 304 [2018-10-24 12:35:54,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:54,692 INFO L481 AbstractCegarLoop]: Abstraction has 309 states and 310 transitions. [2018-10-24 12:35:54,693 INFO L482 AbstractCegarLoop]: Interpolant automaton has 63 states. [2018-10-24 12:35:54,693 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 310 transitions. [2018-10-24 12:35:54,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2018-10-24 12:35:54,694 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:54,695 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:54,695 INFO L424 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:54,695 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:54,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1045637337, now seen corresponding path program 58 times [2018-10-24 12:35:54,695 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:54,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:54,696 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:35:54,696 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:54,696 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:54,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:55,305 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 987 proven. 1796 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2018-10-24 12:35:55,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:55,305 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:55,305 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:55,306 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:55,306 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:55,306 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:35:55,316 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:55,316 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:35:55,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:55,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:55,520 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:35:55,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:56,287 INFO L134 CoverageAnalysis]: Checked inductivity of 4323 backedges. 988 proven. 1711 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2018-10-24 12:35:56,307 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:56,307 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 38 [2018-10-24 12:35:56,308 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:56,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-10-24 12:35:56,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-10-24 12:35:56,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=866, Unknown=0, NotChecked=0, Total=1406 [2018-10-24 12:35:56,309 INFO L87 Difference]: Start difference. First operand 309 states and 310 transitions. Second operand 38 states. [2018-10-24 12:35:56,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:35:56,881 INFO L93 Difference]: Finished difference Result 319 states and 320 transitions. [2018-10-24 12:35:56,881 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-10-24 12:35:56,881 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 306 [2018-10-24 12:35:56,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:35:56,883 INFO L225 Difference]: With dead ends: 319 [2018-10-24 12:35:56,883 INFO L226 Difference]: Without dead ends: 317 [2018-10-24 12:35:56,883 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 581 SyntacticMatches, 61 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=553, Invalid=1007, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:35:56,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2018-10-24 12:35:56,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 317. [2018-10-24 12:35:56,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 317 states. [2018-10-24 12:35:56,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 318 transitions. [2018-10-24 12:35:56,893 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 318 transitions. Word has length 306 [2018-10-24 12:35:56,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:35:56,893 INFO L481 AbstractCegarLoop]: Abstraction has 317 states and 318 transitions. [2018-10-24 12:35:56,893 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-10-24 12:35:56,893 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 318 transitions. [2018-10-24 12:35:56,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2018-10-24 12:35:56,895 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:35:56,895 INFO L375 BasicCegarLoop]: trace histogram [31, 31, 31, 31, 31, 30, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:35:56,895 INFO L424 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:35:56,896 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:35:56,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1185441252, now seen corresponding path program 59 times [2018-10-24 12:35:56,896 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:35:56,896 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:56,897 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:35:56,897 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:35:56,897 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:35:56,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:35:58,149 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:35:58,149 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:58,150 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:35:58,150 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:35:58,150 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:35:58,150 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:35:58,150 INFO L194 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 [2018-10-24 12:35:58,159 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:35:58,159 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:35:58,284 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2018-10-24 12:35:58,284 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:35:58,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:35:58,352 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:35:58,352 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:35:59,514 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 1890 proven. 930 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:35:59,534 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:35:59,534 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 65 [2018-10-24 12:35:59,534 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:35:59,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2018-10-24 12:35:59,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2018-10-24 12:35:59,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1057, Invalid=3103, Unknown=0, NotChecked=0, Total=4160 [2018-10-24 12:35:59,535 INFO L87 Difference]: Start difference. First operand 317 states and 318 transitions. Second operand 65 states. [2018-10-24 12:36:00,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:00,794 INFO L93 Difference]: Finished difference Result 452 states and 484 transitions. [2018-10-24 12:36:00,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2018-10-24 12:36:00,795 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 314 [2018-10-24 12:36:00,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:00,796 INFO L225 Difference]: With dead ends: 452 [2018-10-24 12:36:00,796 INFO L226 Difference]: Without dead ends: 319 [2018-10-24 12:36:00,797 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 567 SyntacticMatches, 62 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3285 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2177, Invalid=7135, Unknown=0, NotChecked=0, Total=9312 [2018-10-24 12:36:00,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-10-24 12:36:00,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2018-10-24 12:36:00,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 319 states. [2018-10-24 12:36:00,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 320 transitions. [2018-10-24 12:36:00,807 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 320 transitions. Word has length 314 [2018-10-24 12:36:00,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:00,807 INFO L481 AbstractCegarLoop]: Abstraction has 319 states and 320 transitions. [2018-10-24 12:36:00,807 INFO L482 AbstractCegarLoop]: Interpolant automaton has 65 states. [2018-10-24 12:36:00,807 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 320 transitions. [2018-10-24 12:36:00,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2018-10-24 12:36:00,809 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:00,809 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 31, 31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:00,809 INFO L424 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:00,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:00,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1802789142, now seen corresponding path program 60 times [2018-10-24 12:36:00,809 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:00,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:00,810 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:00,810 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:00,810 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:00,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:01,438 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1051 proven. 1918 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2018-10-24 12:36:01,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:01,439 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:01,439 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:01,439 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:01,439 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:01,439 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:01,446 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:01,446 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:01,535 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:01,536 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:01,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:01,666 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:36:01,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:02,825 INFO L134 CoverageAnalysis]: Checked inductivity of 4622 backedges. 1052 proven. 1830 refuted. 0 times theorem prover too weak. 1740 trivial. 0 not checked. [2018-10-24 12:36:02,845 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:02,846 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 39 [2018-10-24 12:36:02,846 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:02,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-24 12:36:02,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-24 12:36:02,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=909, Unknown=0, NotChecked=0, Total=1482 [2018-10-24 12:36:02,847 INFO L87 Difference]: Start difference. First operand 319 states and 320 transitions. Second operand 39 states. [2018-10-24 12:36:03,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:03,309 INFO L93 Difference]: Finished difference Result 329 states and 330 transitions. [2018-10-24 12:36:03,309 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-10-24 12:36:03,310 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 316 [2018-10-24 12:36:03,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:03,312 INFO L225 Difference]: With dead ends: 329 [2018-10-24 12:36:03,312 INFO L226 Difference]: Without dead ends: 327 [2018-10-24 12:36:03,313 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 600 SyntacticMatches, 63 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=586, Invalid=1054, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:36:03,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-10-24 12:36:03,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2018-10-24 12:36:03,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2018-10-24 12:36:03,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 328 transitions. [2018-10-24 12:36:03,324 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 328 transitions. Word has length 316 [2018-10-24 12:36:03,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:03,324 INFO L481 AbstractCegarLoop]: Abstraction has 327 states and 328 transitions. [2018-10-24 12:36:03,324 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-24 12:36:03,324 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 328 transitions. [2018-10-24 12:36:03,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2018-10-24 12:36:03,326 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:03,326 INFO L375 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:03,326 INFO L424 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:03,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:03,327 INFO L82 PathProgramCache]: Analyzing trace with hash -2112928423, now seen corresponding path program 61 times [2018-10-24 12:36:03,327 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:03,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:03,327 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:03,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:03,327 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:03,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:04,634 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:04,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:04,635 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:04,635 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:04,635 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:04,635 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:04,635 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:04,643 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:04,644 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:04,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:04,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:04,794 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:04,794 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:06,261 INFO L134 CoverageAnalysis]: Checked inductivity of 4867 backedges. 2015 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:06,281 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:06,281 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 67 [2018-10-24 12:36:06,281 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:06,282 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-10-24 12:36:06,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-10-24 12:36:06,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1123, Invalid=3299, Unknown=0, NotChecked=0, Total=4422 [2018-10-24 12:36:06,283 INFO L87 Difference]: Start difference. First operand 327 states and 328 transitions. Second operand 67 states. [2018-10-24 12:36:08,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:08,486 INFO L93 Difference]: Finished difference Result 466 states and 499 transitions. [2018-10-24 12:36:08,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-10-24 12:36:08,486 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 324 [2018-10-24 12:36:08,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:08,488 INFO L225 Difference]: With dead ends: 466 [2018-10-24 12:36:08,488 INFO L226 Difference]: Without dead ends: 329 [2018-10-24 12:36:08,489 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 585 SyntacticMatches, 64 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3503 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2311, Invalid=7589, Unknown=0, NotChecked=0, Total=9900 [2018-10-24 12:36:08,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-10-24 12:36:08,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 329. [2018-10-24 12:36:08,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 329 states. [2018-10-24 12:36:08,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 330 transitions. [2018-10-24 12:36:08,503 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 330 transitions. Word has length 324 [2018-10-24 12:36:08,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:08,504 INFO L481 AbstractCegarLoop]: Abstraction has 329 states and 330 transitions. [2018-10-24 12:36:08,504 INFO L482 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-10-24 12:36:08,504 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 330 transitions. [2018-10-24 12:36:08,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2018-10-24 12:36:08,506 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:08,506 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:08,506 INFO L424 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:08,506 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:08,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1966924845, now seen corresponding path program 62 times [2018-10-24 12:36:08,507 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:08,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:08,507 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:08,507 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:08,507 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:08,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:09,135 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1117 proven. 2044 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2018-10-24 12:36:09,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:09,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:09,135 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:09,135 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:09,135 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:09,135 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:09,145 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:09,145 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:09,283 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2018-10-24 12:36:09,283 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:09,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:09,432 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:09,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:10,353 INFO L134 CoverageAnalysis]: Checked inductivity of 4931 backedges. 1118 proven. 1953 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-24 12:36:10,373 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:10,374 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 37] total 40 [2018-10-24 12:36:10,374 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:10,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-10-24 12:36:10,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-10-24 12:36:10,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=953, Unknown=0, NotChecked=0, Total=1560 [2018-10-24 12:36:10,375 INFO L87 Difference]: Start difference. First operand 329 states and 330 transitions. Second operand 40 states. [2018-10-24 12:36:10,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:10,816 INFO L93 Difference]: Finished difference Result 339 states and 340 transitions. [2018-10-24 12:36:10,817 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-10-24 12:36:10,817 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 326 [2018-10-24 12:36:10,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:10,819 INFO L225 Difference]: With dead ends: 339 [2018-10-24 12:36:10,819 INFO L226 Difference]: Without dead ends: 337 [2018-10-24 12:36:10,820 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 724 GetRequests, 619 SyntacticMatches, 65 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1284 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=620, Invalid=1102, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:36:10,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2018-10-24 12:36:10,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 337. [2018-10-24 12:36:10,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 337 states. [2018-10-24 12:36:10,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 338 transitions. [2018-10-24 12:36:10,834 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 338 transitions. Word has length 326 [2018-10-24 12:36:10,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:10,835 INFO L481 AbstractCegarLoop]: Abstraction has 337 states and 338 transitions. [2018-10-24 12:36:10,835 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-10-24 12:36:10,835 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 338 transitions. [2018-10-24 12:36:10,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2018-10-24 12:36:10,837 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:10,837 INFO L375 BasicCegarLoop]: trace histogram [33, 33, 33, 33, 33, 32, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:10,837 INFO L424 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:10,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:10,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1568017642, now seen corresponding path program 63 times [2018-10-24 12:36:10,838 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:10,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:10,838 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:10,838 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:10,839 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:10,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:12,739 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:36:12,739 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:12,740 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:12,740 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:12,740 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:12,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:12,740 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:12,750 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:12,750 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:12,846 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:12,846 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:12,851 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:12,921 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:36:12,921 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:14,335 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 2144 proven. 1056 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:36:14,355 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:14,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 69 [2018-10-24 12:36:14,356 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:14,356 INFO L460 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-10-24 12:36:14,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-10-24 12:36:14,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1191, Invalid=3501, Unknown=0, NotChecked=0, Total=4692 [2018-10-24 12:36:14,357 INFO L87 Difference]: Start difference. First operand 337 states and 338 transitions. Second operand 69 states. [2018-10-24 12:36:16,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:16,467 INFO L93 Difference]: Finished difference Result 480 states and 514 transitions. [2018-10-24 12:36:16,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-10-24 12:36:16,468 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 334 [2018-10-24 12:36:16,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:16,469 INFO L225 Difference]: With dead ends: 480 [2018-10-24 12:36:16,469 INFO L226 Difference]: Without dead ends: 339 [2018-10-24 12:36:16,470 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 770 GetRequests, 603 SyntacticMatches, 66 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3728 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=2449, Invalid=8057, Unknown=0, NotChecked=0, Total=10506 [2018-10-24 12:36:16,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2018-10-24 12:36:16,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 339. [2018-10-24 12:36:16,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 339 states. [2018-10-24 12:36:16,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 340 transitions. [2018-10-24 12:36:16,484 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 340 transitions. Word has length 334 [2018-10-24 12:36:16,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:16,484 INFO L481 AbstractCegarLoop]: Abstraction has 339 states and 340 transitions. [2018-10-24 12:36:16,484 INFO L482 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-10-24 12:36:16,484 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 340 transitions. [2018-10-24 12:36:16,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2018-10-24 12:36:16,486 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:16,486 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 33, 33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:16,486 INFO L424 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:16,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:16,486 INFO L82 PathProgramCache]: Analyzing trace with hash -907577072, now seen corresponding path program 64 times [2018-10-24 12:36:16,486 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:16,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:16,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:16,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:16,487 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:16,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:17,193 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1185 proven. 2174 refuted. 0 times theorem prover too weak. 1891 trivial. 0 not checked. [2018-10-24 12:36:17,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:17,193 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:17,194 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:17,194 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:17,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:17,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:17,201 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:17,201 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:17,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:17,299 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:17,551 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:36:17,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:18,527 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 1186 proven. 2080 refuted. 0 times theorem prover too weak. 1984 trivial. 0 not checked. [2018-10-24 12:36:18,547 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:18,547 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 41 [2018-10-24 12:36:18,547 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:18,548 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-10-24 12:36:18,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-10-24 12:36:18,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=998, Unknown=0, NotChecked=0, Total=1640 [2018-10-24 12:36:18,548 INFO L87 Difference]: Start difference. First operand 339 states and 340 transitions. Second operand 41 states. [2018-10-24 12:36:19,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:19,052 INFO L93 Difference]: Finished difference Result 349 states and 350 transitions. [2018-10-24 12:36:19,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-10-24 12:36:19,053 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 336 [2018-10-24 12:36:19,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:19,055 INFO L225 Difference]: With dead ends: 349 [2018-10-24 12:36:19,055 INFO L226 Difference]: Without dead ends: 347 [2018-10-24 12:36:19,056 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 746 GetRequests, 638 SyntacticMatches, 67 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=655, Invalid=1151, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:36:19,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 347 states. [2018-10-24 12:36:19,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 347 to 347. [2018-10-24 12:36:19,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 347 states. [2018-10-24 12:36:19,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 348 transitions. [2018-10-24 12:36:19,067 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 348 transitions. Word has length 336 [2018-10-24 12:36:19,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:19,068 INFO L481 AbstractCegarLoop]: Abstraction has 347 states and 348 transitions. [2018-10-24 12:36:19,068 INFO L482 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-10-24 12:36:19,068 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 348 transitions. [2018-10-24 12:36:19,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2018-10-24 12:36:19,069 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:19,069 INFO L375 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:19,070 INFO L424 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:19,070 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:19,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1370504365, now seen corresponding path program 65 times [2018-10-24 12:36:19,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:19,070 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:19,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:19,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:19,071 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:19,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:20,991 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:20,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:20,991 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:20,991 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:20,991 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:20,991 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:20,991 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:20,999 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:20,999 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:21,141 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2018-10-24 12:36:21,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:21,146 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:21,218 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:21,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:22,971 INFO L134 CoverageAnalysis]: Checked inductivity of 5511 backedges. 2277 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:22,991 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:22,991 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 71, 71] total 71 [2018-10-24 12:36:22,991 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:22,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 71 states [2018-10-24 12:36:22,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2018-10-24 12:36:22,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1261, Invalid=3709, Unknown=0, NotChecked=0, Total=4970 [2018-10-24 12:36:22,993 INFO L87 Difference]: Start difference. First operand 347 states and 348 transitions. Second operand 71 states. [2018-10-24 12:36:24,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:24,645 INFO L93 Difference]: Finished difference Result 494 states and 529 transitions. [2018-10-24 12:36:24,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-10-24 12:36:24,645 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 344 [2018-10-24 12:36:24,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:24,647 INFO L225 Difference]: With dead ends: 494 [2018-10-24 12:36:24,647 INFO L226 Difference]: Without dead ends: 349 [2018-10-24 12:36:24,648 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 793 GetRequests, 621 SyntacticMatches, 68 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3960 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2591, Invalid=8539, Unknown=0, NotChecked=0, Total=11130 [2018-10-24 12:36:24,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2018-10-24 12:36:24,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 349. [2018-10-24 12:36:24,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 349 states. [2018-10-24 12:36:24,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 350 transitions. [2018-10-24 12:36:24,660 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 350 transitions. Word has length 344 [2018-10-24 12:36:24,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:24,660 INFO L481 AbstractCegarLoop]: Abstraction has 349 states and 350 transitions. [2018-10-24 12:36:24,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 71 states. [2018-10-24 12:36:24,660 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 350 transitions. [2018-10-24 12:36:24,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-10-24 12:36:24,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:24,662 INFO L375 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 34, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:24,662 INFO L424 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:24,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:24,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1034000589, now seen corresponding path program 66 times [2018-10-24 12:36:24,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:24,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:24,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:24,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:24,663 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:24,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:25,313 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1255 proven. 2308 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-24 12:36:25,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:25,313 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:25,313 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:25,313 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:25,313 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:25,313 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:25,321 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:25,321 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:25,424 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:25,425 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:25,430 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:25,562 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:25,562 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:26,578 INFO L134 CoverageAnalysis]: Checked inductivity of 5579 backedges. 1256 proven. 2211 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2018-10-24 12:36:26,598 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:26,599 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 39] total 42 [2018-10-24 12:36:26,599 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:26,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-10-24 12:36:26,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-10-24 12:36:26,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=1044, Unknown=0, NotChecked=0, Total=1722 [2018-10-24 12:36:26,600 INFO L87 Difference]: Start difference. First operand 349 states and 350 transitions. Second operand 42 states. [2018-10-24 12:36:27,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:27,045 INFO L93 Difference]: Finished difference Result 359 states and 360 transitions. [2018-10-24 12:36:27,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-10-24 12:36:27,045 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 346 [2018-10-24 12:36:27,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:27,047 INFO L225 Difference]: With dead ends: 359 [2018-10-24 12:36:27,048 INFO L226 Difference]: Without dead ends: 357 [2018-10-24 12:36:27,048 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 768 GetRequests, 657 SyntacticMatches, 69 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1432 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=691, Invalid=1201, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:36:27,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 357 states. [2018-10-24 12:36:27,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 357 to 357. [2018-10-24 12:36:27,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 357 states. [2018-10-24 12:36:27,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 358 transitions. [2018-10-24 12:36:27,059 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 358 transitions. Word has length 346 [2018-10-24 12:36:27,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:27,060 INFO L481 AbstractCegarLoop]: Abstraction has 357 states and 358 transitions. [2018-10-24 12:36:27,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-10-24 12:36:27,060 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 358 transitions. [2018-10-24 12:36:27,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2018-10-24 12:36:27,062 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:27,062 INFO L375 BasicCegarLoop]: trace histogram [35, 35, 35, 35, 35, 34, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:27,062 INFO L424 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:27,062 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:27,062 INFO L82 PathProgramCache]: Analyzing trace with hash -2013211120, now seen corresponding path program 67 times [2018-10-24 12:36:27,063 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:27,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:27,063 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:27,063 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:27,063 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:27,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:28,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:36:28,864 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:28,864 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:28,864 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:28,864 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:28,865 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:28,865 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:28,873 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:28,873 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:28,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:28,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:29,070 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:36:29,071 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:30,515 INFO L134 CoverageAnalysis]: Checked inductivity of 5848 backedges. 2414 proven. 1190 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:36:30,536 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:30,536 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 73, 73] total 73 [2018-10-24 12:36:30,536 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:30,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2018-10-24 12:36:30,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2018-10-24 12:36:30,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1333, Invalid=3923, Unknown=0, NotChecked=0, Total=5256 [2018-10-24 12:36:30,538 INFO L87 Difference]: Start difference. First operand 357 states and 358 transitions. Second operand 73 states. [2018-10-24 12:36:32,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:32,168 INFO L93 Difference]: Finished difference Result 508 states and 544 transitions. [2018-10-24 12:36:32,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2018-10-24 12:36:32,168 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 354 [2018-10-24 12:36:32,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:32,169 INFO L225 Difference]: With dead ends: 508 [2018-10-24 12:36:32,169 INFO L226 Difference]: Without dead ends: 359 [2018-10-24 12:36:32,171 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 639 SyntacticMatches, 70 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4199 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2737, Invalid=9035, Unknown=0, NotChecked=0, Total=11772 [2018-10-24 12:36:32,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2018-10-24 12:36:32,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 359. [2018-10-24 12:36:32,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2018-10-24 12:36:32,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 360 transitions. [2018-10-24 12:36:32,182 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 360 transitions. Word has length 354 [2018-10-24 12:36:32,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:32,183 INFO L481 AbstractCegarLoop]: Abstraction has 359 states and 360 transitions. [2018-10-24 12:36:32,183 INFO L482 AbstractCegarLoop]: Interpolant automaton has 73 states. [2018-10-24 12:36:32,183 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 360 transitions. [2018-10-24 12:36:32,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2018-10-24 12:36:32,184 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:32,184 INFO L375 BasicCegarLoop]: trace histogram [36, 35, 35, 35, 35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:32,184 INFO L424 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:32,185 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:32,185 INFO L82 PathProgramCache]: Analyzing trace with hash 600414986, now seen corresponding path program 68 times [2018-10-24 12:36:32,185 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:32,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:32,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:32,186 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:32,186 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:32,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:33,133 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1327 proven. 2446 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-24 12:36:33,133 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:33,134 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:33,134 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:33,134 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:33,134 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:33,134 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:33,141 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:33,141 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:33,305 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2018-10-24 12:36:33,305 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:33,310 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:33,449 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:36:33,449 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:34,484 INFO L134 CoverageAnalysis]: Checked inductivity of 5918 backedges. 1328 proven. 2346 refuted. 0 times theorem prover too weak. 2244 trivial. 0 not checked. [2018-10-24 12:36:34,504 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:34,504 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 40] total 43 [2018-10-24 12:36:34,505 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:34,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-24 12:36:34,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-24 12:36:34,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=715, Invalid=1091, Unknown=0, NotChecked=0, Total=1806 [2018-10-24 12:36:34,506 INFO L87 Difference]: Start difference. First operand 359 states and 360 transitions. Second operand 43 states. [2018-10-24 12:36:35,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:35,023 INFO L93 Difference]: Finished difference Result 369 states and 370 transitions. [2018-10-24 12:36:35,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-24 12:36:35,024 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 356 [2018-10-24 12:36:35,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:35,026 INFO L225 Difference]: With dead ends: 369 [2018-10-24 12:36:35,026 INFO L226 Difference]: Without dead ends: 367 [2018-10-24 12:36:35,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 790 GetRequests, 676 SyntacticMatches, 71 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1509 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=728, Invalid=1252, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:36:35,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-10-24 12:36:35,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 367. [2018-10-24 12:36:35,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 367 states. [2018-10-24 12:36:35,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 368 transitions. [2018-10-24 12:36:35,037 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 368 transitions. Word has length 356 [2018-10-24 12:36:35,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:35,038 INFO L481 AbstractCegarLoop]: Abstraction has 367 states and 368 transitions. [2018-10-24 12:36:35,038 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-24 12:36:35,038 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 368 transitions. [2018-10-24 12:36:35,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 365 [2018-10-24 12:36:35,039 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:35,039 INFO L375 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:35,040 INFO L424 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:35,040 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:35,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1554691251, now seen corresponding path program 69 times [2018-10-24 12:36:35,040 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:35,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:35,041 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:35,041 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:35,041 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:35,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:36,616 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:36:36,616 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:36,616 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:36,617 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:36,617 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:36,617 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:36,617 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:36,625 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:36,625 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:36,731 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:36,731 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:36,737 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:36,810 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:36:36,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:38,821 INFO L134 CoverageAnalysis]: Checked inductivity of 6195 backedges. 2555 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:36:38,842 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:38,842 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 75, 75] total 75 [2018-10-24 12:36:38,842 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:38,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2018-10-24 12:36:38,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2018-10-24 12:36:38,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1407, Invalid=4143, Unknown=0, NotChecked=0, Total=5550 [2018-10-24 12:36:38,844 INFO L87 Difference]: Start difference. First operand 367 states and 368 transitions. Second operand 75 states. [2018-10-24 12:36:41,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:41,337 INFO L93 Difference]: Finished difference Result 522 states and 559 transitions. [2018-10-24 12:36:41,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-10-24 12:36:41,337 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 364 [2018-10-24 12:36:41,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:41,339 INFO L225 Difference]: With dead ends: 522 [2018-10-24 12:36:41,339 INFO L226 Difference]: Without dead ends: 369 [2018-10-24 12:36:41,340 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 839 GetRequests, 657 SyntacticMatches, 72 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4445 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=2887, Invalid=9545, Unknown=0, NotChecked=0, Total=12432 [2018-10-24 12:36:41,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2018-10-24 12:36:41,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 369. [2018-10-24 12:36:41,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 369 states. [2018-10-24 12:36:41,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 370 transitions. [2018-10-24 12:36:41,357 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 370 transitions. Word has length 364 [2018-10-24 12:36:41,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:41,357 INFO L481 AbstractCegarLoop]: Abstraction has 369 states and 370 transitions. [2018-10-24 12:36:41,357 INFO L482 AbstractCegarLoop]: Interpolant automaton has 75 states. [2018-10-24 12:36:41,358 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 370 transitions. [2018-10-24 12:36:41,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2018-10-24 12:36:41,360 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:41,360 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 36, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:41,360 INFO L424 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:41,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:41,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1521508409, now seen corresponding path program 70 times [2018-10-24 12:36:41,361 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:41,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:41,361 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:41,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:41,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:41,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:42,104 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1401 proven. 2588 refuted. 0 times theorem prover too weak. 2278 trivial. 0 not checked. [2018-10-24 12:36:42,104 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:42,105 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:42,105 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:42,105 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:42,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:42,105 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:42,112 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:42,112 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:42,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:42,220 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:42,362 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:36:42,362 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:43,786 INFO L134 CoverageAnalysis]: Checked inductivity of 6267 backedges. 1402 proven. 2485 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2018-10-24 12:36:43,806 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:43,806 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 44 [2018-10-24 12:36:43,806 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:43,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-10-24 12:36:43,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-10-24 12:36:43,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=1139, Unknown=0, NotChecked=0, Total=1892 [2018-10-24 12:36:43,807 INFO L87 Difference]: Start difference. First operand 369 states and 370 transitions. Second operand 44 states. [2018-10-24 12:36:44,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:44,390 INFO L93 Difference]: Finished difference Result 379 states and 380 transitions. [2018-10-24 12:36:44,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-10-24 12:36:44,390 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 366 [2018-10-24 12:36:44,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:44,393 INFO L225 Difference]: With dead ends: 379 [2018-10-24 12:36:44,393 INFO L226 Difference]: Without dead ends: 377 [2018-10-24 12:36:44,393 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 812 GetRequests, 695 SyntacticMatches, 73 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1588 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=766, Invalid=1304, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:36:44,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-10-24 12:36:44,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 377. [2018-10-24 12:36:44,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2018-10-24 12:36:44,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 378 transitions. [2018-10-24 12:36:44,408 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 378 transitions. Word has length 366 [2018-10-24 12:36:44,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:44,408 INFO L481 AbstractCegarLoop]: Abstraction has 377 states and 378 transitions. [2018-10-24 12:36:44,408 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-10-24 12:36:44,408 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 378 transitions. [2018-10-24 12:36:44,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2018-10-24 12:36:44,410 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:44,410 INFO L375 BasicCegarLoop]: trace histogram [37, 37, 37, 37, 37, 36, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:44,410 INFO L424 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:44,410 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:44,410 INFO L82 PathProgramCache]: Analyzing trace with hash -954383606, now seen corresponding path program 71 times [2018-10-24 12:36:44,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:44,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:44,411 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:44,411 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:44,411 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:44,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:46,044 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:36:46,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:46,044 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:46,044 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:46,044 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:46,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:46,045 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:46,051 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:36:46,051 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:36:46,205 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2018-10-24 12:36:46,205 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:46,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:46,294 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:36:46,294 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:48,131 INFO L134 CoverageAnalysis]: Checked inductivity of 6552 backedges. 2700 proven. 1332 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:36:48,151 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:48,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [77, 77, 77] total 77 [2018-10-24 12:36:48,151 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:48,152 INFO L460 AbstractCegarLoop]: Interpolant automaton has 77 states [2018-10-24 12:36:48,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2018-10-24 12:36:48,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4369, Unknown=0, NotChecked=0, Total=5852 [2018-10-24 12:36:48,153 INFO L87 Difference]: Start difference. First operand 377 states and 378 transitions. Second operand 77 states. [2018-10-24 12:36:50,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:50,785 INFO L93 Difference]: Finished difference Result 536 states and 574 transitions. [2018-10-24 12:36:50,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2018-10-24 12:36:50,786 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 374 [2018-10-24 12:36:50,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:50,787 INFO L225 Difference]: With dead ends: 536 [2018-10-24 12:36:50,787 INFO L226 Difference]: Without dead ends: 379 [2018-10-24 12:36:50,788 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 862 GetRequests, 675 SyntacticMatches, 74 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4698 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=3041, Invalid=10069, Unknown=0, NotChecked=0, Total=13110 [2018-10-24 12:36:50,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2018-10-24 12:36:50,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 379. [2018-10-24 12:36:50,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 379 states. [2018-10-24 12:36:50,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 380 transitions. [2018-10-24 12:36:50,803 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 380 transitions. Word has length 374 [2018-10-24 12:36:50,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:50,803 INFO L481 AbstractCegarLoop]: Abstraction has 379 states and 380 transitions. [2018-10-24 12:36:50,804 INFO L482 AbstractCegarLoop]: Interpolant automaton has 77 states. [2018-10-24 12:36:50,804 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 380 transitions. [2018-10-24 12:36:50,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2018-10-24 12:36:50,805 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:50,805 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 37, 37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:50,805 INFO L424 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:50,806 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:50,806 INFO L82 PathProgramCache]: Analyzing trace with hash 406570756, now seen corresponding path program 72 times [2018-10-24 12:36:50,806 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:50,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:50,806 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:50,806 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:50,807 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:50,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:51,567 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1477 proven. 2734 refuted. 0 times theorem prover too weak. 2415 trivial. 0 not checked. [2018-10-24 12:36:51,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:51,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:51,568 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:51,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:51,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:51,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:51,575 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:36:51,575 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:36:51,685 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:36:51,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:36:51,691 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:51,840 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:36:51,841 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:53,376 INFO L134 CoverageAnalysis]: Checked inductivity of 6626 backedges. 1478 proven. 2628 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2018-10-24 12:36:53,396 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:53,396 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 45 [2018-10-24 12:36:53,396 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:53,397 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-10-24 12:36:53,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-10-24 12:36:53,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=1188, Unknown=0, NotChecked=0, Total=1980 [2018-10-24 12:36:53,397 INFO L87 Difference]: Start difference. First operand 379 states and 380 transitions. Second operand 45 states. [2018-10-24 12:36:53,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:36:53,902 INFO L93 Difference]: Finished difference Result 389 states and 390 transitions. [2018-10-24 12:36:53,902 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-10-24 12:36:53,903 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 376 [2018-10-24 12:36:53,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:36:53,905 INFO L225 Difference]: With dead ends: 389 [2018-10-24 12:36:53,906 INFO L226 Difference]: Without dead ends: 387 [2018-10-24 12:36:53,906 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 834 GetRequests, 714 SyntacticMatches, 75 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1669 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=805, Invalid=1357, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:36:53,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2018-10-24 12:36:53,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2018-10-24 12:36:53,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 387 states. [2018-10-24 12:36:53,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 388 transitions. [2018-10-24 12:36:53,922 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 388 transitions. Word has length 376 [2018-10-24 12:36:53,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:36:53,922 INFO L481 AbstractCegarLoop]: Abstraction has 387 states and 388 transitions. [2018-10-24 12:36:53,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-10-24 12:36:53,922 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 388 transitions. [2018-10-24 12:36:53,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2018-10-24 12:36:53,924 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:36:53,924 INFO L375 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:36:53,924 INFO L424 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:36:53,925 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:36:53,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1329651015, now seen corresponding path program 73 times [2018-10-24 12:36:53,925 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:36:53,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:53,925 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:36:53,925 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:36:53,926 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:36:53,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:55,689 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:36:55,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:55,689 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:36:55,690 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:36:55,690 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:36:55,690 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:36:55,690 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:36:55,696 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:36:55,697 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:36:55,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:36:55,807 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:36:55,917 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:36:55,917 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:36:57,638 INFO L134 CoverageAnalysis]: Checked inductivity of 6919 backedges. 2849 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:36:57,659 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:36:57,659 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 79, 79] total 79 [2018-10-24 12:36:57,659 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:36:57,660 INFO L460 AbstractCegarLoop]: Interpolant automaton has 79 states [2018-10-24 12:36:57,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2018-10-24 12:36:57,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1561, Invalid=4601, Unknown=0, NotChecked=0, Total=6162 [2018-10-24 12:36:57,661 INFO L87 Difference]: Start difference. First operand 387 states and 388 transitions. Second operand 79 states. [2018-10-24 12:37:01,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:01,153 INFO L93 Difference]: Finished difference Result 550 states and 589 transitions. [2018-10-24 12:37:01,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2018-10-24 12:37:01,160 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 384 [2018-10-24 12:37:01,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:01,162 INFO L225 Difference]: With dead ends: 550 [2018-10-24 12:37:01,162 INFO L226 Difference]: Without dead ends: 389 [2018-10-24 12:37:01,164 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 885 GetRequests, 693 SyntacticMatches, 76 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4958 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=3199, Invalid=10607, Unknown=0, NotChecked=0, Total=13806 [2018-10-24 12:37:01,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2018-10-24 12:37:01,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 389. [2018-10-24 12:37:01,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 389 states. [2018-10-24 12:37:01,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 390 transitions. [2018-10-24 12:37:01,180 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 390 transitions. Word has length 384 [2018-10-24 12:37:01,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:01,181 INFO L481 AbstractCegarLoop]: Abstraction has 389 states and 390 transitions. [2018-10-24 12:37:01,181 INFO L482 AbstractCegarLoop]: Interpolant automaton has 79 states. [2018-10-24 12:37:01,181 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 390 transitions. [2018-10-24 12:37:01,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-10-24 12:37:01,183 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:01,183 INFO L375 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 38, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:01,183 INFO L424 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:01,184 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:01,184 INFO L82 PathProgramCache]: Analyzing trace with hash -1045548863, now seen corresponding path program 74 times [2018-10-24 12:37:01,184 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:01,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:01,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:01,185 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:01,185 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:01,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:02,002 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1555 proven. 2884 refuted. 0 times theorem prover too weak. 2556 trivial. 0 not checked. [2018-10-24 12:37:02,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:02,003 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:02,003 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:02,003 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:02,003 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:02,003 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:02,010 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:02,010 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:02,182 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2018-10-24 12:37:02,183 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:02,188 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:02,351 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:02,351 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:03,793 INFO L134 CoverageAnalysis]: Checked inductivity of 6995 backedges. 1556 proven. 2775 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2018-10-24 12:37:03,814 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:03,814 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 46 [2018-10-24 12:37:03,814 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:03,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-10-24 12:37:03,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-10-24 12:37:03,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=1238, Unknown=0, NotChecked=0, Total=2070 [2018-10-24 12:37:03,815 INFO L87 Difference]: Start difference. First operand 389 states and 390 transitions. Second operand 46 states. [2018-10-24 12:37:04,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:04,398 INFO L93 Difference]: Finished difference Result 399 states and 400 transitions. [2018-10-24 12:37:04,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-10-24 12:37:04,398 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 386 [2018-10-24 12:37:04,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:04,401 INFO L225 Difference]: With dead ends: 399 [2018-10-24 12:37:04,401 INFO L226 Difference]: Without dead ends: 397 [2018-10-24 12:37:04,401 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 733 SyntacticMatches, 77 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1752 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=845, Invalid=1411, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:37:04,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2018-10-24 12:37:04,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2018-10-24 12:37:04,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 397 states. [2018-10-24 12:37:04,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 398 transitions. [2018-10-24 12:37:04,413 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 398 transitions. Word has length 386 [2018-10-24 12:37:04,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:04,414 INFO L481 AbstractCegarLoop]: Abstraction has 397 states and 398 transitions. [2018-10-24 12:37:04,414 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-10-24 12:37:04,414 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 398 transitions. [2018-10-24 12:37:04,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2018-10-24 12:37:04,415 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:04,415 INFO L375 BasicCegarLoop]: trace histogram [39, 39, 39, 39, 39, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:04,416 INFO L424 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:04,416 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:04,416 INFO L82 PathProgramCache]: Analyzing trace with hash -289392124, now seen corresponding path program 75 times [2018-10-24 12:37:04,416 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:04,416 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:04,416 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:04,417 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:04,417 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:04,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:06,441 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-24 12:37:06,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:06,442 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:06,442 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:06,442 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:06,442 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:06,442 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:06,450 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:06,450 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:06,563 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:06,563 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:06,570 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:06,662 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-24 12:37:06,663 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:08,716 INFO L134 CoverageAnalysis]: Checked inductivity of 7296 backedges. 3002 proven. 1482 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-24 12:37:08,737 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:08,737 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [81, 81, 81] total 81 [2018-10-24 12:37:08,737 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:08,738 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2018-10-24 12:37:08,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2018-10-24 12:37:08,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1641, Invalid=4839, Unknown=0, NotChecked=0, Total=6480 [2018-10-24 12:37:08,738 INFO L87 Difference]: Start difference. First operand 397 states and 398 transitions. Second operand 81 states. [2018-10-24 12:37:11,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:11,644 INFO L93 Difference]: Finished difference Result 564 states and 604 transitions. [2018-10-24 12:37:11,644 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2018-10-24 12:37:11,644 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 394 [2018-10-24 12:37:11,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:11,646 INFO L225 Difference]: With dead ends: 564 [2018-10-24 12:37:11,646 INFO L226 Difference]: Without dead ends: 399 [2018-10-24 12:37:11,647 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 711 SyntacticMatches, 78 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5225 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=3361, Invalid=11159, Unknown=0, NotChecked=0, Total=14520 [2018-10-24 12:37:11,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2018-10-24 12:37:11,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 399. [2018-10-24 12:37:11,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2018-10-24 12:37:11,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 400 transitions. [2018-10-24 12:37:11,660 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 400 transitions. Word has length 394 [2018-10-24 12:37:11,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:11,660 INFO L481 AbstractCegarLoop]: Abstraction has 399 states and 400 transitions. [2018-10-24 12:37:11,660 INFO L482 AbstractCegarLoop]: Interpolant automaton has 81 states. [2018-10-24 12:37:11,660 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 400 transitions. [2018-10-24 12:37:11,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2018-10-24 12:37:11,662 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:11,662 INFO L375 BasicCegarLoop]: trace histogram [40, 39, 39, 39, 39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:11,662 INFO L424 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:11,662 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:11,662 INFO L82 PathProgramCache]: Analyzing trace with hash 400489726, now seen corresponding path program 76 times [2018-10-24 12:37:11,662 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:11,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:11,663 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:11,663 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:11,663 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:11,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:12,527 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1635 proven. 3038 refuted. 0 times theorem prover too weak. 2701 trivial. 0 not checked. [2018-10-24 12:37:12,527 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:12,527 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:12,527 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:12,528 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:12,528 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:12,528 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:12,536 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:12,536 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:12,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:12,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:12,811 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1636 proven. 2926 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-24 12:37:12,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:14,331 INFO L134 CoverageAnalysis]: Checked inductivity of 7374 backedges. 1636 proven. 2926 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2018-10-24 12:37:14,351 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:14,352 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 47 [2018-10-24 12:37:14,352 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:14,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-24 12:37:14,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-24 12:37:14,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=873, Invalid=1289, Unknown=0, NotChecked=0, Total=2162 [2018-10-24 12:37:14,353 INFO L87 Difference]: Start difference. First operand 399 states and 400 transitions. Second operand 47 states. [2018-10-24 12:37:14,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:14,937 INFO L93 Difference]: Finished difference Result 409 states and 410 transitions. [2018-10-24 12:37:14,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-10-24 12:37:14,938 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 396 [2018-10-24 12:37:14,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:14,941 INFO L225 Difference]: With dead ends: 409 [2018-10-24 12:37:14,941 INFO L226 Difference]: Without dead ends: 407 [2018-10-24 12:37:14,942 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 752 SyntacticMatches, 79 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1837 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=886, Invalid=1466, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:37:14,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2018-10-24 12:37:14,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 407. [2018-10-24 12:37:14,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 407 states. [2018-10-24 12:37:14,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 408 transitions. [2018-10-24 12:37:14,954 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 408 transitions. Word has length 396 [2018-10-24 12:37:14,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:14,955 INFO L481 AbstractCegarLoop]: Abstraction has 407 states and 408 transitions. [2018-10-24 12:37:14,955 INFO L482 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-10-24 12:37:14,955 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 408 transitions. [2018-10-24 12:37:14,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2018-10-24 12:37:14,956 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:14,956 INFO L375 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:14,957 INFO L424 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:14,957 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:14,957 INFO L82 PathProgramCache]: Analyzing trace with hash -239896255, now seen corresponding path program 77 times [2018-10-24 12:37:14,957 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:14,957 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:14,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:14,958 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:14,958 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:14,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:16,908 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-24 12:37:16,909 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:16,909 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:16,909 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:16,909 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:16,909 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:16,909 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:16,917 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:16,917 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:17,088 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-10-24 12:37:17,088 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:17,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:17,187 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-24 12:37:17,187 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:19,352 INFO L134 CoverageAnalysis]: Checked inductivity of 7683 backedges. 3159 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-24 12:37:19,374 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:19,375 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 83, 83] total 83 [2018-10-24 12:37:19,375 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:19,375 INFO L460 AbstractCegarLoop]: Interpolant automaton has 83 states [2018-10-24 12:37:19,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2018-10-24 12:37:19,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1723, Invalid=5083, Unknown=0, NotChecked=0, Total=6806 [2018-10-24 12:37:19,376 INFO L87 Difference]: Start difference. First operand 407 states and 408 transitions. Second operand 83 states. [2018-10-24 12:37:22,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:22,660 INFO L93 Difference]: Finished difference Result 578 states and 619 transitions. [2018-10-24 12:37:22,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2018-10-24 12:37:22,660 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 404 [2018-10-24 12:37:22,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:22,662 INFO L225 Difference]: With dead ends: 578 [2018-10-24 12:37:22,662 INFO L226 Difference]: Without dead ends: 409 [2018-10-24 12:37:22,663 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 931 GetRequests, 729 SyntacticMatches, 80 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5499 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3527, Invalid=11725, Unknown=0, NotChecked=0, Total=15252 [2018-10-24 12:37:22,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2018-10-24 12:37:22,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 409. [2018-10-24 12:37:22,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-10-24 12:37:22,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 410 transitions. [2018-10-24 12:37:22,676 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 410 transitions. Word has length 404 [2018-10-24 12:37:22,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:22,676 INFO L481 AbstractCegarLoop]: Abstraction has 409 states and 410 transitions. [2018-10-24 12:37:22,676 INFO L482 AbstractCegarLoop]: Interpolant automaton has 83 states. [2018-10-24 12:37:22,676 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 410 transitions. [2018-10-24 12:37:22,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2018-10-24 12:37:22,678 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:22,678 INFO L375 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 40, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:22,678 INFO L424 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:22,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:22,679 INFO L82 PathProgramCache]: Analyzing trace with hash -2078389317, now seen corresponding path program 78 times [2018-10-24 12:37:22,679 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:22,679 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:22,680 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:22,680 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:22,680 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:22,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:23,563 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1717 proven. 3196 refuted. 0 times theorem prover too weak. 2850 trivial. 0 not checked. [2018-10-24 12:37:23,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:23,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:23,563 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:23,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:23,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:23,564 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:23,571 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:23,571 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:23,691 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:23,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:23,697 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:23,916 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1718 proven. 3081 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-24 12:37:23,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:25,297 INFO L134 CoverageAnalysis]: Checked inductivity of 7763 backedges. 1718 proven. 3081 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2018-10-24 12:37:25,318 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:25,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45, 45] total 48 [2018-10-24 12:37:25,318 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:25,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-10-24 12:37:25,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-10-24 12:37:25,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=915, Invalid=1341, Unknown=0, NotChecked=0, Total=2256 [2018-10-24 12:37:25,319 INFO L87 Difference]: Start difference. First operand 409 states and 410 transitions. Second operand 48 states. [2018-10-24 12:37:25,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:25,894 INFO L93 Difference]: Finished difference Result 419 states and 420 transitions. [2018-10-24 12:37:25,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-10-24 12:37:25,894 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 406 [2018-10-24 12:37:25,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:25,896 INFO L225 Difference]: With dead ends: 419 [2018-10-24 12:37:25,896 INFO L226 Difference]: Without dead ends: 417 [2018-10-24 12:37:25,896 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 900 GetRequests, 771 SyntacticMatches, 81 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1924 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=928, Invalid=1522, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:37:25,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2018-10-24 12:37:25,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 417. [2018-10-24 12:37:25,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 417 states. [2018-10-24 12:37:25,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 418 transitions. [2018-10-24 12:37:25,909 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 418 transitions. Word has length 406 [2018-10-24 12:37:25,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:25,910 INFO L481 AbstractCegarLoop]: Abstraction has 417 states and 418 transitions. [2018-10-24 12:37:25,910 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-10-24 12:37:25,910 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 418 transitions. [2018-10-24 12:37:25,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2018-10-24 12:37:25,911 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:25,912 INFO L375 BasicCegarLoop]: trace histogram [41, 41, 41, 41, 41, 40, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:25,912 INFO L424 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:25,912 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:25,912 INFO L82 PathProgramCache]: Analyzing trace with hash -11879682, now seen corresponding path program 79 times [2018-10-24 12:37:25,912 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:25,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:25,913 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:25,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:25,913 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:25,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:27,962 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-24 12:37:27,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:27,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:27,962 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:27,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:27,962 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:27,962 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:27,969 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:27,970 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:28,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:28,084 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:28,173 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-24 12:37:28,173 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:30,507 INFO L134 CoverageAnalysis]: Checked inductivity of 8080 backedges. 3320 proven. 1640 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-24 12:37:30,528 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:30,529 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [85, 85, 85] total 85 [2018-10-24 12:37:30,529 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:30,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 85 states [2018-10-24 12:37:30,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2018-10-24 12:37:30,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1807, Invalid=5333, Unknown=0, NotChecked=0, Total=7140 [2018-10-24 12:37:30,530 INFO L87 Difference]: Start difference. First operand 417 states and 418 transitions. Second operand 85 states. [2018-10-24 12:37:33,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:33,671 INFO L93 Difference]: Finished difference Result 592 states and 634 transitions. [2018-10-24 12:37:33,672 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2018-10-24 12:37:33,672 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 414 [2018-10-24 12:37:33,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:33,674 INFO L225 Difference]: With dead ends: 592 [2018-10-24 12:37:33,675 INFO L226 Difference]: Without dead ends: 419 [2018-10-24 12:37:33,677 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 954 GetRequests, 747 SyntacticMatches, 82 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5780 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=3697, Invalid=12305, Unknown=0, NotChecked=0, Total=16002 [2018-10-24 12:37:33,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2018-10-24 12:37:33,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 419. [2018-10-24 12:37:33,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 419 states. [2018-10-24 12:37:33,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 420 transitions. [2018-10-24 12:37:33,691 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 420 transitions. Word has length 414 [2018-10-24 12:37:33,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:33,691 INFO L481 AbstractCegarLoop]: Abstraction has 419 states and 420 transitions. [2018-10-24 12:37:33,691 INFO L482 AbstractCegarLoop]: Interpolant automaton has 85 states. [2018-10-24 12:37:33,691 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 420 transitions. [2018-10-24 12:37:33,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2018-10-24 12:37:33,693 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:33,693 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 41, 41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:33,693 INFO L424 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:33,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:33,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1529594632, now seen corresponding path program 80 times [2018-10-24 12:37:33,694 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:33,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:33,694 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:33,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:33,694 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:33,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:34,892 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1801 proven. 3358 refuted. 0 times theorem prover too weak. 3003 trivial. 0 not checked. [2018-10-24 12:37:34,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:34,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:34,893 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:34,893 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:34,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:34,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:34,900 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-24 12:37:34,900 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-24 12:37:35,088 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 42 check-sat command(s) [2018-10-24 12:37:35,088 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:35,094 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:35,280 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1802 proven. 3240 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-24 12:37:35,280 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:36,665 INFO L134 CoverageAnalysis]: Checked inductivity of 8162 backedges. 1802 proven. 3240 refuted. 0 times theorem prover too weak. 3120 trivial. 0 not checked. [2018-10-24 12:37:36,686 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:36,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 49 [2018-10-24 12:37:36,686 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:36,686 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-10-24 12:37:36,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-10-24 12:37:36,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=1394, Unknown=0, NotChecked=0, Total=2352 [2018-10-24 12:37:36,687 INFO L87 Difference]: Start difference. First operand 419 states and 420 transitions. Second operand 49 states. [2018-10-24 12:37:37,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:37,295 INFO L93 Difference]: Finished difference Result 429 states and 430 transitions. [2018-10-24 12:37:37,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-10-24 12:37:37,296 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 416 [2018-10-24 12:37:37,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:37,298 INFO L225 Difference]: With dead ends: 429 [2018-10-24 12:37:37,298 INFO L226 Difference]: Without dead ends: 427 [2018-10-24 12:37:37,298 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 922 GetRequests, 790 SyntacticMatches, 83 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2013 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=971, Invalid=1579, Unknown=0, NotChecked=0, Total=2550 [2018-10-24 12:37:37,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2018-10-24 12:37:37,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 427. [2018-10-24 12:37:37,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 427 states. [2018-10-24 12:37:37,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 428 transitions. [2018-10-24 12:37:37,312 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 428 transitions. Word has length 416 [2018-10-24 12:37:37,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:37,313 INFO L481 AbstractCegarLoop]: Abstraction has 427 states and 428 transitions. [2018-10-24 12:37:37,313 INFO L482 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-10-24 12:37:37,313 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 428 transitions. [2018-10-24 12:37:37,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 425 [2018-10-24 12:37:37,315 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:37,316 INFO L375 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:37,316 INFO L424 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:37,316 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:37,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1540235067, now seen corresponding path program 81 times [2018-10-24 12:37:37,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:37,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:37,317 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:37,317 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:37,317 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:37,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:39,774 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-10-24 12:37:39,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:39,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:39,775 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:39,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:39,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:39,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:39,783 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-24 12:37:39,783 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-24 12:37:39,924 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-24 12:37:39,925 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-24 12:37:39,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:40,042 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-10-24 12:37:40,043 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:42,203 INFO L134 CoverageAnalysis]: Checked inductivity of 8487 backedges. 3485 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-10-24 12:37:42,223 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:42,223 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 87, 87] total 87 [2018-10-24 12:37:42,224 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:42,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 87 states [2018-10-24 12:37:42,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2018-10-24 12:37:42,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1893, Invalid=5589, Unknown=0, NotChecked=0, Total=7482 [2018-10-24 12:37:42,225 INFO L87 Difference]: Start difference. First operand 427 states and 428 transitions. Second operand 87 states. [2018-10-24 12:37:46,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:46,004 INFO L93 Difference]: Finished difference Result 606 states and 649 transitions. [2018-10-24 12:37:46,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2018-10-24 12:37:46,014 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 424 [2018-10-24 12:37:46,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:46,016 INFO L225 Difference]: With dead ends: 606 [2018-10-24 12:37:46,016 INFO L226 Difference]: Without dead ends: 429 [2018-10-24 12:37:46,019 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 977 GetRequests, 765 SyntacticMatches, 84 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6068 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=3871, Invalid=12899, Unknown=0, NotChecked=0, Total=16770 [2018-10-24 12:37:46,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 429 states. [2018-10-24 12:37:46,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 429 to 429. [2018-10-24 12:37:46,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 429 states. [2018-10-24 12:37:46,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 430 transitions. [2018-10-24 12:37:46,039 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 430 transitions. Word has length 424 [2018-10-24 12:37:46,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:46,039 INFO L481 AbstractCegarLoop]: Abstraction has 429 states and 430 transitions. [2018-10-24 12:37:46,040 INFO L482 AbstractCegarLoop]: Interpolant automaton has 87 states. [2018-10-24 12:37:46,040 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 430 transitions. [2018-10-24 12:37:46,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2018-10-24 12:37:46,042 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:46,043 INFO L375 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 42, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:46,043 INFO L424 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:46,043 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:46,043 INFO L82 PathProgramCache]: Analyzing trace with hash 260108469, now seen corresponding path program 82 times [2018-10-24 12:37:46,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:46,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:46,045 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-24 12:37:46,045 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:46,045 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:46,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:47,010 INFO L134 CoverageAnalysis]: Checked inductivity of 8571 backedges. 1887 proven. 3524 refuted. 0 times theorem prover too weak. 3160 trivial. 0 not checked. [2018-10-24 12:37:47,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:47,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-24 12:37:47,010 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-24 12:37:47,010 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-24 12:37:47,010 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-24 12:37:47,010 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-24 12:37:47,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:47,018 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-24 12:37:47,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-24 12:37:47,138 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-24 12:37:47,315 INFO L134 CoverageAnalysis]: Checked inductivity of 8571 backedges. 1888 proven. 3403 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-10-24 12:37:47,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-24 12:37:48,829 INFO L134 CoverageAnalysis]: Checked inductivity of 8571 backedges. 1888 proven. 3403 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2018-10-24 12:37:48,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-24 12:37:48,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 47] total 50 [2018-10-24 12:37:48,849 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-24 12:37:48,850 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-10-24 12:37:48,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-10-24 12:37:48,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1002, Invalid=1448, Unknown=0, NotChecked=0, Total=2450 [2018-10-24 12:37:48,851 INFO L87 Difference]: Start difference. First operand 429 states and 430 transitions. Second operand 50 states. [2018-10-24 12:37:49,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-24 12:37:49,674 INFO L93 Difference]: Finished difference Result 439 states and 440 transitions. [2018-10-24 12:37:49,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-10-24 12:37:49,675 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 426 [2018-10-24 12:37:49,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-24 12:37:49,677 INFO L225 Difference]: With dead ends: 439 [2018-10-24 12:37:49,677 INFO L226 Difference]: Without dead ends: 437 [2018-10-24 12:37:49,678 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 944 GetRequests, 809 SyntacticMatches, 85 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2104 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1015, Invalid=1637, Unknown=0, NotChecked=0, Total=2652 [2018-10-24 12:37:49,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2018-10-24 12:37:49,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 437. [2018-10-24 12:37:49,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 437 states. [2018-10-24 12:37:49,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 438 transitions. [2018-10-24 12:37:49,696 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 438 transitions. Word has length 426 [2018-10-24 12:37:49,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-24 12:37:49,696 INFO L481 AbstractCegarLoop]: Abstraction has 437 states and 438 transitions. [2018-10-24 12:37:49,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-10-24 12:37:49,696 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 438 transitions. [2018-10-24 12:37:49,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 435 [2018-10-24 12:37:49,698 INFO L367 BasicCegarLoop]: Found error trace [2018-10-24 12:37:49,698 INFO L375 BasicCegarLoop]: trace histogram [43, 43, 43, 43, 43, 42, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-24 12:37:49,699 INFO L424 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-24 12:37:49,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-24 12:37:49,699 INFO L82 PathProgramCache]: Analyzing trace with hash -1432500744, now seen corresponding path program 83 times [2018-10-24 12:37:49,699 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-24 12:37:49,699 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:49,700 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-24 12:37:49,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-24 12:37:49,700 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-24 12:37:49,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-10-24 12:37:51,323 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-24 12:37:51,328 WARN L205 ceAbstractionStarter]: Timeout [2018-10-24 12:37:51,328 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 12:37:51 BoogieIcfgContainer [2018-10-24 12:37:51,328 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-24 12:37:51,329 INFO L168 Benchmark]: Toolchain (without parser) took 231370.71 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 946.3 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -633.2 MB). Peak memory consumption was 313.1 MB. Max. memory is 7.1 GB. [2018-10-24 12:37:51,330 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:37:51,330 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.94 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-10-24 12:37:51,330 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.94 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:37:51,331 INFO L168 Benchmark]: Boogie Preprocessor took 21.53 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-10-24 12:37:51,331 INFO L168 Benchmark]: RCFGBuilder took 375.29 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 751.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -791.9 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2018-10-24 12:37:51,331 INFO L168 Benchmark]: TraceAbstraction took 230690.73 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 195.0 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 148.1 MB). Peak memory consumption was 343.1 MB. Max. memory is 7.1 GB. [2018-10-24 12:37:51,334 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 257.94 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 20.94 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 21.53 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 375.29 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 751.3 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -791.9 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 230690.73 ms. Allocated memory was 2.3 GB in the beginning and 2.5 GB in the end (delta: 195.0 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 148.1 MB). Peak memory consumption was 343.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 435 with TraceHistMax 43,while InterpolatingTraceCheckCraig was constructing Craig interpolants,while PredicateComparison was comparing new predicate (quantifier-free) to 76 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. TIMEOUT Result, 230.6s OverallTime, 86 OverallIterations, 43 TraceHistogramMax, 76.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 4608 SDtfs, 3742 SDslu, 46891 SDs, 0 SdLazy, 60565 SolverSat, 4438 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 38.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 41877 GetRequests, 34200 SyntacticMatches, 3649 SemanticMatches, 4028 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120215 ImplicationChecksByTransitivity, 149.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=437occurred in iteration=85, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.8s AutomataMinimizationTime, 85 MinimizatonAttempts, 5 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 1.0s SsaConstructionTime, 6.3s SatisfiabilityAnalysisTime, 138.0s InterpolantComputationTime, 36943 NumberOfCodeBlocks, 36943 NumberOfCodeBlocksAsserted, 768 NumberOfCheckSat, 55144 ConstructedInterpolants, 0 QuantifiedInterpolants, 34746008 SizeOfPredicates, 246 NumberOfNonLiveVariables, 39114 ConjunctsInSsa, 3936 ConjunctsInUnsatCore, 249 InterpolantComputations, 3 PerfectInterpolantSequences, 508320/730376 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown