java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 04:00:57,063 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 04:00:57,065 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 04:00:57,080 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 04:00:57,081 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 04:00:57,082 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 04:00:57,083 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 04:00:57,085 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 04:00:57,086 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 04:00:57,087 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 04:00:57,088 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 04:00:57,088 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 04:00:57,089 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 04:00:57,090 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 04:00:57,091 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 04:00:57,092 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 04:00:57,093 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 04:00:57,095 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 04:00:57,097 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 04:00:57,098 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 04:00:57,099 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 04:00:57,100 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 04:00:57,103 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 04:00:57,103 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 04:00:57,104 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 04:00:57,104 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 04:00:57,105 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 04:00:57,106 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 04:00:57,107 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 04:00:57,108 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 04:00:57,108 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 04:00:57,109 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-27 04:00:57,109 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-27 04:00:57,109 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-27 04:00:57,110 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-27 04:00:57,111 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-27 04:00:57,112 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-10-27 04:00:57,127 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 04:00:57,128 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 04:00:57,128 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 04:00:57,129 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 04:00:57,129 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 04:00:57,129 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 04:00:57,129 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 04:00:57,129 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 04:00:57,130 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 04:00:57,130 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 04:00:57,130 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 04:00:57,130 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 04:00:57,131 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 04:00:57,131 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 04:00:57,131 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 04:00:57,131 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 04:00:57,132 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 04:00:57,132 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 04:00:57,132 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 04:00:57,135 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 04:00:57,135 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 04:00:57,135 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 04:00:57,135 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 04:00:57,136 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 04:00:57,136 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 04:00:57,136 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 04:00:57,136 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 04:00:57,137 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 04:00:57,137 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 04:00:57,137 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 04:00:57,137 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 04:00:57,137 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 04:00:57,138 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 04:00:57,138 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 04:00:57,191 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 04:00:57,215 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 04:00:57,219 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 04:00:57,220 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 04:00:57,221 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 04:00:57,222 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-27 04:00:57,285 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/de3d0e1a7/e17f7aad967a4fdbb4d3941422f9939a/FLAG985de323b [2018-10-27 04:00:57,772 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 04:00:57,773 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c24_false-unreach-call.i [2018-10-27 04:00:57,784 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/de3d0e1a7/e17f7aad967a4fdbb4d3941422f9939a/FLAG985de323b [2018-10-27 04:00:57,797 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/de3d0e1a7/e17f7aad967a4fdbb4d3941422f9939a [2018-10-27 04:00:57,809 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 04:00:57,811 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 04:00:57,812 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 04:00:57,812 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 04:00:57,816 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 04:00:57,817 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:00:57" (1/1) ... [2018-10-27 04:00:57,820 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@403d6da2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:57, skipping insertion in model container [2018-10-27 04:00:57,820 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 04:00:57" (1/1) ... [2018-10-27 04:00:57,830 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 04:00:57,869 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 04:00:58,178 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:00:58,216 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 04:00:58,282 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 04:00:58,332 INFO L193 MainTranslator]: Completed translation [2018-10-27 04:00:58,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58 WrapperNode [2018-10-27 04:00:58,333 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 04:00:58,334 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 04:00:58,334 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 04:00:58,336 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 04:00:58,348 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,369 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,421 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 04:00:58,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 04:00:58,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 04:00:58,422 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 04:00:58,436 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,436 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,448 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,449 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,464 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,479 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,487 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (1/1) ... [2018-10-27 04:00:58,495 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 04:00:58,496 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 04:00:58,496 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 04:00:58,496 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 04:00:58,497 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (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 [2018-10-27 04:00:58,642 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 04:00:58,643 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 04:00:58,643 INFO L130 BoogieDeclarations]: Found specification of procedure bar [2018-10-27 04:00:58,643 INFO L138 BoogieDeclarations]: Found implementation of procedure bar [2018-10-27 04:00:58,643 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 04:00:58,643 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 04:00:58,643 INFO L130 BoogieDeclarations]: Found specification of procedure foo [2018-10-27 04:00:58,643 INFO L138 BoogieDeclarations]: Found implementation of procedure foo [2018-10-27 04:00:58,644 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memmove [2018-10-27 04:00:58,644 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memmove [2018-10-27 04:00:58,644 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 04:00:58,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 04:00:58,644 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 04:00:58,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 04:00:59,325 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 04:00:59,326 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:00:59 BoogieIcfgContainer [2018-10-27 04:00:59,326 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 04:00:59,327 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 04:00:59,327 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 04:00:59,331 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 04:00:59,331 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 04:00:57" (1/3) ... [2018-10-27 04:00:59,332 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20deae15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:00:59, skipping insertion in model container [2018-10-27 04:00:59,332 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 04:00:58" (2/3) ... [2018-10-27 04:00:59,333 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20deae15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 04:00:59, skipping insertion in model container [2018-10-27 04:00:59,333 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 04:00:59" (3/3) ... [2018-10-27 04:00:59,335 INFO L112 eAbstractionObserver]: Analyzing ICFG n.c24_false-unreach-call.i [2018-10-27 04:00:59,346 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 04:00:59,360 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 04:00:59,379 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 04:00:59,421 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 04:00:59,421 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 04:00:59,422 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 04:00:59,422 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 04:00:59,422 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 04:00:59,422 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 04:00:59,422 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 04:00:59,423 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 04:00:59,442 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states. [2018-10-27 04:00:59,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 04:00:59,448 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:00:59,449 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:00:59,451 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:00:59,458 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:00:59,458 INFO L82 PathProgramCache]: Analyzing trace with hash 277346705, now seen corresponding path program 1 times [2018-10-27 04:00:59,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:00:59,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:00:59,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:00:59,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:00:59,524 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:00:59,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:00:59,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:00:59,617 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:00:59,618 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 04:00:59,618 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:00:59,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 04:00:59,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 04:00:59,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 04:00:59,645 INFO L87 Difference]: Start difference. First operand 55 states. Second operand 2 states. [2018-10-27 04:00:59,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:00:59,681 INFO L93 Difference]: Finished difference Result 101 states and 134 transitions. [2018-10-27 04:00:59,681 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 04:00:59,682 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-10-27 04:00:59,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:00:59,697 INFO L225 Difference]: With dead ends: 101 [2018-10-27 04:00:59,697 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 04:00:59,703 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 [2018-10-27 04:00:59,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 04:00:59,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 04:00:59,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 04:00:59,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2018-10-27 04:00:59,749 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 13 [2018-10-27 04:00:59,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:00:59,750 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2018-10-27 04:00:59,750 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 04:00:59,750 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2018-10-27 04:00:59,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 04:00:59,751 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:00:59,752 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:00:59,752 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:00:59,752 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:00:59,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1161873536, now seen corresponding path program 1 times [2018-10-27 04:00:59,753 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:00:59,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:00:59,754 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:00:59,754 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:00:59,754 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:00:59,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:00:59,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 04:00:59,862 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 04:00:59,862 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 04:00:59,862 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:00:59,864 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 04:00:59,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 04:00:59,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:00:59,865 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand 3 states. [2018-10-27 04:01:00,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:00,053 INFO L93 Difference]: Finished difference Result 113 states and 142 transitions. [2018-10-27 04:01:00,053 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 04:01:00,054 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2018-10-27 04:01:00,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:00,056 INFO L225 Difference]: With dead ends: 113 [2018-10-27 04:01:00,056 INFO L226 Difference]: Without dead ends: 74 [2018-10-27 04:01:00,059 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 04:01:00,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-27 04:01:00,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 52. [2018-10-27 04:01:00,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 04:01:00,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 61 transitions. [2018-10-27 04:01:00,074 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 61 transitions. Word has length 15 [2018-10-27 04:01:00,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:00,075 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 61 transitions. [2018-10-27 04:01:00,075 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 04:01:00,075 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 61 transitions. [2018-10-27 04:01:00,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 04:01:00,076 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:00,077 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:00,077 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:00,077 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:00,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1375381986, now seen corresponding path program 1 times [2018-10-27 04:01:00,078 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:00,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:00,079 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:00,079 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:00,079 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:00,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:00,222 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 04:01:00,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:00,222 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:00,224 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 26 with the following transitions: [2018-10-27 04:01:00,230 INFO L202 CegarAbsIntRunner]: [2], [3], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [113], [120], [123], [125], [131], [132], [133], [141] [2018-10-27 04:01:00,290 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:01:00,291 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:01:00,522 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 04:01:02,498 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:01:02,500 INFO L272 AbstractInterpreter]: Visited 23 different actions 269 times. Merged at 10 different actions 204 times. Widened at 3 different actions 50 times. Found 2 fixpoints after 2 different actions. Largest state had 35 variables. [2018-10-27 04:01:02,549 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:02,551 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:01:02,552 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:02,552 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 [2018-10-27 04:01:02,573 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:02,573 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:01:02,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:02,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:02,789 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 04:01:02,789 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:03,085 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-27 04:01:03,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:03,129 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2018-10-27 04:01:03,129 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:03,130 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 04:01:03,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 04:01:03,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 04:01:03,133 INFO L87 Difference]: Start difference. First operand 52 states and 61 transitions. Second operand 5 states. [2018-10-27 04:01:03,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:03,821 INFO L93 Difference]: Finished difference Result 141 states and 180 transitions. [2018-10-27 04:01:03,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 04:01:03,822 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2018-10-27 04:01:03,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:03,824 INFO L225 Difference]: With dead ends: 141 [2018-10-27 04:01:03,824 INFO L226 Difference]: Without dead ends: 100 [2018-10-27 04:01:03,827 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-10-27 04:01:03,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2018-10-27 04:01:03,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 78. [2018-10-27 04:01:03,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-10-27 04:01:03,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 97 transitions. [2018-10-27 04:01:03,849 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 97 transitions. Word has length 25 [2018-10-27 04:01:03,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:03,849 INFO L481 AbstractCegarLoop]: Abstraction has 78 states and 97 transitions. [2018-10-27 04:01:03,849 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 04:01:03,850 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 97 transitions. [2018-10-27 04:01:03,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 04:01:03,854 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:03,854 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:03,855 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:03,855 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:03,855 INFO L82 PathProgramCache]: Analyzing trace with hash -103717632, now seen corresponding path program 2 times [2018-10-27 04:01:03,855 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:03,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:03,857 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:03,857 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:03,857 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:03,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:04,080 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-27 04:01:04,081 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:04,081 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:04,082 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:04,082 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:04,082 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:04,082 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 [2018-10-27 04:01:04,095 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:01:04,095 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:01:04,151 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-27 04:01:04,151 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:04,155 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:04,536 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-27 04:01:04,537 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:04,782 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-10-27 04:01:04,809 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-27 04:01:04,809 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5] total 11 [2018-10-27 04:01:04,809 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 04:01:04,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 04:01:04,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 04:01:04,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2018-10-27 04:01:04,811 INFO L87 Difference]: Start difference. First operand 78 states and 97 transitions. Second operand 5 states. [2018-10-27 04:01:04,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:04,892 INFO L93 Difference]: Finished difference Result 127 states and 166 transitions. [2018-10-27 04:01:04,892 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 04:01:04,892 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 35 [2018-10-27 04:01:04,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:04,894 INFO L225 Difference]: With dead ends: 127 [2018-10-27 04:01:04,894 INFO L226 Difference]: Without dead ends: 122 [2018-10-27 04:01:04,895 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2018-10-27 04:01:04,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-10-27 04:01:04,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 80. [2018-10-27 04:01:04,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2018-10-27 04:01:04,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 100 transitions. [2018-10-27 04:01:04,908 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 100 transitions. Word has length 35 [2018-10-27 04:01:04,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:04,908 INFO L481 AbstractCegarLoop]: Abstraction has 80 states and 100 transitions. [2018-10-27 04:01:04,908 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 04:01:04,908 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 100 transitions. [2018-10-27 04:01:04,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 04:01:04,910 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:04,910 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:04,911 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:04,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:04,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1875911917, now seen corresponding path program 1 times [2018-10-27 04:01:04,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:04,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:04,913 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:04,913 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:04,913 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:04,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:05,168 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 04:01:05,168 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:05,168 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:05,169 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 46 with the following transitions: [2018-10-27 04:01:05,169 INFO L202 CegarAbsIntRunner]: [2], [3], [4], [5], [17], [21], [24], [26], [28], [32], [36], [39], [41], [45], [49], [53], [56], [58], [60], [64], [67], [109], [113], [120], [123], [125], [131], [132], [133], [135], [136], [141] [2018-10-27 04:01:05,173 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-27 04:01:05,173 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 04:01:05,193 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-27 04:01:08,737 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 04:01:08,738 INFO L272 AbstractInterpreter]: Visited 32 different actions 948 times. Merged at 16 different actions 630 times. Widened at 5 different actions 144 times. Found 64 fixpoints after 6 different actions. Largest state had 37 variables. [2018-10-27 04:01:08,776 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:08,776 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 04:01:08,776 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:08,776 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 [2018-10-27 04:01:08,787 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:08,788 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:01:08,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:08,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:08,918 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 04:01:08,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:09,478 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-27 04:01:09,508 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:09,511 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2018-10-27 04:01:09,511 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:09,512 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 04:01:09,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 04:01:09,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 04:01:09,517 INFO L87 Difference]: Start difference. First operand 80 states and 100 transitions. Second operand 6 states. [2018-10-27 04:01:10,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:10,239 INFO L93 Difference]: Finished difference Result 205 states and 268 transitions. [2018-10-27 04:01:10,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 04:01:10,241 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2018-10-27 04:01:10,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:10,242 INFO L225 Difference]: With dead ends: 205 [2018-10-27 04:01:10,242 INFO L226 Difference]: Without dead ends: 139 [2018-10-27 04:01:10,243 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-10-27 04:01:10,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2018-10-27 04:01:10,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 106. [2018-10-27 04:01:10,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-10-27 04:01:10,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 136 transitions. [2018-10-27 04:01:10,274 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 136 transitions. Word has length 45 [2018-10-27 04:01:10,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:10,275 INFO L481 AbstractCegarLoop]: Abstraction has 106 states and 136 transitions. [2018-10-27 04:01:10,275 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 04:01:10,275 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 136 transitions. [2018-10-27 04:01:10,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 04:01:10,279 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:10,279 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:10,279 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:10,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:10,280 INFO L82 PathProgramCache]: Analyzing trace with hash -588961457, now seen corresponding path program 2 times [2018-10-27 04:01:10,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:10,282 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:10,282 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:10,283 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:10,283 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:10,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:10,688 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2018-10-27 04:01:10,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:10,689 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:10,689 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:10,689 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:10,689 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:10,689 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 [2018-10-27 04:01:10,707 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:01:10,707 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:01:10,782 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 04:01:10,782 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:10,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:11,649 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-27 04:01:11,649 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:12,311 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-10-27 04:01:12,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:12,343 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 16 [2018-10-27 04:01:12,343 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:12,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 04:01:12,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 04:01:12,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2018-10-27 04:01:12,345 INFO L87 Difference]: Start difference. First operand 106 states and 136 transitions. Second operand 11 states. [2018-10-27 04:01:13,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:13,369 INFO L93 Difference]: Finished difference Result 462 states and 644 transitions. [2018-10-27 04:01:13,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:01:13,371 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 55 [2018-10-27 04:01:13,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:13,374 INFO L225 Difference]: With dead ends: 462 [2018-10-27 04:01:13,374 INFO L226 Difference]: Without dead ends: 370 [2018-10-27 04:01:13,376 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=224, Invalid=646, Unknown=0, NotChecked=0, Total=870 [2018-10-27 04:01:13,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2018-10-27 04:01:13,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 150. [2018-10-27 04:01:13,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2018-10-27 04:01:13,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 200 transitions. [2018-10-27 04:01:13,400 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 200 transitions. Word has length 55 [2018-10-27 04:01:13,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:13,401 INFO L481 AbstractCegarLoop]: Abstraction has 150 states and 200 transitions. [2018-10-27 04:01:13,401 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 04:01:13,401 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 200 transitions. [2018-10-27 04:01:13,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-27 04:01:13,404 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:13,404 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:13,405 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:13,405 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:13,405 INFO L82 PathProgramCache]: Analyzing trace with hash 175545882, now seen corresponding path program 3 times [2018-10-27 04:01:13,405 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:13,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:13,406 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:13,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:13,406 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:13,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:13,545 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-27 04:01:13,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:13,545 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:13,545 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:13,545 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:13,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:13,546 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 [2018-10-27 04:01:13,553 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:01:13,554 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:01:13,633 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:01:13,633 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:13,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:13,760 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-27 04:01:13,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:14,339 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2018-10-27 04:01:14,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:14,362 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2018-10-27 04:01:14,362 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:14,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 04:01:14,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 04:01:14,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 04:01:14,364 INFO L87 Difference]: Start difference. First operand 150 states and 200 transitions. Second operand 8 states. [2018-10-27 04:01:15,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:15,276 INFO L93 Difference]: Finished difference Result 375 states and 518 transitions. [2018-10-27 04:01:15,277 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 04:01:15,277 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 75 [2018-10-27 04:01:15,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:15,280 INFO L225 Difference]: With dead ends: 375 [2018-10-27 04:01:15,280 INFO L226 Difference]: Without dead ends: 245 [2018-10-27 04:01:15,284 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2018-10-27 04:01:15,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2018-10-27 04:01:15,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 176. [2018-10-27 04:01:15,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-10-27 04:01:15,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 236 transitions. [2018-10-27 04:01:15,330 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 236 transitions. Word has length 75 [2018-10-27 04:01:15,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:15,331 INFO L481 AbstractCegarLoop]: Abstraction has 176 states and 236 transitions. [2018-10-27 04:01:15,331 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 04:01:15,331 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 236 transitions. [2018-10-27 04:01:15,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-10-27 04:01:15,335 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:15,337 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:15,337 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:15,337 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:15,338 INFO L82 PathProgramCache]: Analyzing trace with hash -2053819268, now seen corresponding path program 4 times [2018-10-27 04:01:15,338 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:15,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:15,339 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:15,339 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:15,339 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:15,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:15,505 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-27 04:01:15,505 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:15,505 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:15,505 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:15,508 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:15,509 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:15,509 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 [2018-10-27 04:01:15,522 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:15,522 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:01:15,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:15,591 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:15,618 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-27 04:01:15,618 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:15,744 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2018-10-27 04:01:15,768 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:15,768 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2018-10-27 04:01:15,769 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:15,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 04:01:15,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 04:01:15,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 04:01:15,770 INFO L87 Difference]: Start difference. First operand 176 states and 236 transitions. Second operand 9 states. [2018-10-27 04:01:16,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:16,060 INFO L93 Difference]: Finished difference Result 424 states and 587 transitions. [2018-10-27 04:01:16,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 04:01:16,062 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 85 [2018-10-27 04:01:16,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:16,065 INFO L225 Difference]: With dead ends: 424 [2018-10-27 04:01:16,065 INFO L226 Difference]: Without dead ends: 271 [2018-10-27 04:01:16,067 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2018-10-27 04:01:16,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2018-10-27 04:01:16,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 202. [2018-10-27 04:01:16,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-10-27 04:01:16,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 272 transitions. [2018-10-27 04:01:16,088 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 272 transitions. Word has length 85 [2018-10-27 04:01:16,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:16,088 INFO L481 AbstractCegarLoop]: Abstraction has 202 states and 272 transitions. [2018-10-27 04:01:16,088 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 04:01:16,089 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 272 transitions. [2018-10-27 04:01:16,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-10-27 04:01:16,091 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:16,091 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:16,091 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:16,091 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:16,092 INFO L82 PathProgramCache]: Analyzing trace with hash -1431295078, now seen corresponding path program 5 times [2018-10-27 04:01:16,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:16,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:16,093 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:16,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:16,093 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:16,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:16,258 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2018-10-27 04:01:16,258 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:16,258 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:16,259 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:16,259 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:16,259 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:16,259 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 [2018-10-27 04:01:16,267 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:01:16,267 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:01:16,323 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-27 04:01:16,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:16,331 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:16,509 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 47 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-27 04:01:16,509 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:16,707 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 47 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-10-27 04:01:16,731 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:16,731 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 21 [2018-10-27 04:01:16,732 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:16,733 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:01:16,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:01:16,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2018-10-27 04:01:16,734 INFO L87 Difference]: Start difference. First operand 202 states and 272 transitions. Second operand 15 states. [2018-10-27 04:01:18,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:18,795 INFO L93 Difference]: Finished difference Result 935 states and 1327 transitions. [2018-10-27 04:01:18,796 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-10-27 04:01:18,796 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 95 [2018-10-27 04:01:18,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:18,803 INFO L225 Difference]: With dead ends: 935 [2018-10-27 04:01:18,803 INFO L226 Difference]: Without dead ends: 756 [2018-10-27 04:01:18,805 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 567 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=725, Invalid=1927, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 04:01:18,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 756 states. [2018-10-27 04:01:18,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 756 to 246. [2018-10-27 04:01:18,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2018-10-27 04:01:18,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 336 transitions. [2018-10-27 04:01:18,841 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 336 transitions. Word has length 95 [2018-10-27 04:01:18,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:18,842 INFO L481 AbstractCegarLoop]: Abstraction has 246 states and 336 transitions. [2018-10-27 04:01:18,842 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:01:18,842 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 336 transitions. [2018-10-27 04:01:18,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2018-10-27 04:01:18,844 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:18,844 INFO L375 BasicCegarLoop]: trace histogram [10, 8, 8, 7, 7, 7, 7, 7, 7, 7, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:18,845 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:18,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:18,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1239096169, now seen corresponding path program 6 times [2018-10-27 04:01:18,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:18,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:18,846 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:18,847 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:18,847 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:18,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:19,041 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-27 04:01:19,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:19,042 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:19,042 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:19,042 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:19,042 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:19,042 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 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 [2018-10-27 04:01:19,052 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:01:19,053 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:01:19,116 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:01:19,116 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:19,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:19,149 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-27 04:01:19,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:19,402 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 233 trivial. 0 not checked. [2018-10-27 04:01:19,434 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:19,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2018-10-27 04:01:19,435 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:19,435 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 04:01:19,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 04:01:19,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 04:01:19,437 INFO L87 Difference]: Start difference. First operand 246 states and 336 transitions. Second operand 11 states. [2018-10-27 04:01:19,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:19,800 INFO L93 Difference]: Finished difference Result 594 states and 837 transitions. [2018-10-27 04:01:19,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 04:01:19,809 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 115 [2018-10-27 04:01:19,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:19,812 INFO L225 Difference]: With dead ends: 594 [2018-10-27 04:01:19,812 INFO L226 Difference]: Without dead ends: 377 [2018-10-27 04:01:19,814 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-10-27 04:01:19,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2018-10-27 04:01:19,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 272. [2018-10-27 04:01:19,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-10-27 04:01:19,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 372 transitions. [2018-10-27 04:01:19,850 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 372 transitions. Word has length 115 [2018-10-27 04:01:19,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:19,850 INFO L481 AbstractCegarLoop]: Abstraction has 272 states and 372 transitions. [2018-10-27 04:01:19,850 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 04:01:19,850 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 372 transitions. [2018-10-27 04:01:19,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2018-10-27 04:01:19,852 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:19,853 INFO L375 BasicCegarLoop]: trace histogram [11, 9, 9, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:19,853 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:19,853 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:19,853 INFO L82 PathProgramCache]: Analyzing trace with hash -2041958265, now seen corresponding path program 7 times [2018-10-27 04:01:19,853 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:19,854 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:19,854 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:19,855 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:19,855 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:19,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:20,833 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-27 04:01:20,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:20,834 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:20,834 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:20,834 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:20,834 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:20,834 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 [2018-10-27 04:01:20,843 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:20,844 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:01:20,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:20,911 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:20,992 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-27 04:01:20,992 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:21,163 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 290 trivial. 0 not checked. [2018-10-27 04:01:21,186 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:21,186 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2018-10-27 04:01:21,187 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:21,187 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 04:01:21,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 04:01:21,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 04:01:21,188 INFO L87 Difference]: Start difference. First operand 272 states and 372 transitions. Second operand 12 states. [2018-10-27 04:01:21,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:21,787 INFO L93 Difference]: Finished difference Result 643 states and 906 transitions. [2018-10-27 04:01:21,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 04:01:21,792 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 125 [2018-10-27 04:01:21,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:21,795 INFO L225 Difference]: With dead ends: 643 [2018-10-27 04:01:21,795 INFO L226 Difference]: Without dead ends: 403 [2018-10-27 04:01:21,797 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 241 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2018-10-27 04:01:21,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2018-10-27 04:01:21,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 298. [2018-10-27 04:01:21,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-10-27 04:01:21,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 408 transitions. [2018-10-27 04:01:21,832 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 408 transitions. Word has length 125 [2018-10-27 04:01:21,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:21,833 INFO L481 AbstractCegarLoop]: Abstraction has 298 states and 408 transitions. [2018-10-27 04:01:21,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 04:01:21,833 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 408 transitions. [2018-10-27 04:01:21,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-10-27 04:01:21,835 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:21,835 INFO L375 BasicCegarLoop]: trace histogram [12, 10, 10, 9, 9, 9, 9, 9, 9, 9, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:21,836 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:21,836 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:21,836 INFO L82 PathProgramCache]: Analyzing trace with hash 1943870825, now seen corresponding path program 8 times [2018-10-27 04:01:21,836 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:21,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:21,837 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:21,837 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:21,837 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:21,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:22,357 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 354 trivial. 0 not checked. [2018-10-27 04:01:22,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:22,358 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:22,358 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:22,358 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:22,358 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:22,358 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 [2018-10-27 04:01:22,367 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:01:22,367 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:01:22,426 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-10-27 04:01:22,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:22,430 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:22,581 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2018-10-27 04:01:22,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:22,768 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 90 proven. 27 refuted. 0 times theorem prover too weak. 363 trivial. 0 not checked. [2018-10-27 04:01:22,795 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:22,795 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9, 9] total 26 [2018-10-27 04:01:22,795 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:22,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 04:01:22,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 04:01:22,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2018-10-27 04:01:22,797 INFO L87 Difference]: Start difference. First operand 298 states and 408 transitions. Second operand 19 states. [2018-10-27 04:01:26,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:26,458 INFO L93 Difference]: Finished difference Result 1540 states and 2202 transitions. [2018-10-27 04:01:26,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2018-10-27 04:01:26,459 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 135 [2018-10-27 04:01:26,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:26,467 INFO L225 Difference]: With dead ends: 1540 [2018-10-27 04:01:26,467 INFO L226 Difference]: Without dead ends: 1274 [2018-10-27 04:01:26,472 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1667 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1773, Invalid=4547, Unknown=0, NotChecked=0, Total=6320 [2018-10-27 04:01:26,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1274 states. [2018-10-27 04:01:26,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1274 to 342. [2018-10-27 04:01:26,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 342 states. [2018-10-27 04:01:26,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 472 transitions. [2018-10-27 04:01:26,533 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 472 transitions. Word has length 135 [2018-10-27 04:01:26,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:26,534 INFO L481 AbstractCegarLoop]: Abstraction has 342 states and 472 transitions. [2018-10-27 04:01:26,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 04:01:26,534 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 472 transitions. [2018-10-27 04:01:26,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-10-27 04:01:26,537 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:26,537 INFO L375 BasicCegarLoop]: trace histogram [14, 11, 11, 10, 10, 10, 10, 10, 10, 10, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:26,537 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:26,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:26,538 INFO L82 PathProgramCache]: Analyzing trace with hash -168664780, now seen corresponding path program 9 times [2018-10-27 04:01:26,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:26,538 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:26,539 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:26,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:26,539 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:26,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:27,249 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-27 04:01:27,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:27,249 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:27,250 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:27,250 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:27,250 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:27,250 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 [2018-10-27 04:01:27,291 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:01:27,291 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:01:27,385 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:01:27,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:27,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:27,424 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-27 04:01:27,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:27,624 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 475 trivial. 0 not checked. [2018-10-27 04:01:27,647 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:27,647 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2018-10-27 04:01:27,647 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:27,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 04:01:27,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 04:01:27,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 04:01:27,649 INFO L87 Difference]: Start difference. First operand 342 states and 472 transitions. Second operand 14 states. [2018-10-27 04:01:28,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:28,099 INFO L93 Difference]: Finished difference Result 813 states and 1156 transitions. [2018-10-27 04:01:28,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 04:01:28,100 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 155 [2018-10-27 04:01:28,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:28,103 INFO L225 Difference]: With dead ends: 813 [2018-10-27 04:01:28,103 INFO L226 Difference]: Without dead ends: 509 [2018-10-27 04:01:28,105 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 299 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2018-10-27 04:01:28,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2018-10-27 04:01:28,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 368. [2018-10-27 04:01:28,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2018-10-27 04:01:28,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 508 transitions. [2018-10-27 04:01:28,161 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 508 transitions. Word has length 155 [2018-10-27 04:01:28,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:28,161 INFO L481 AbstractCegarLoop]: Abstraction has 368 states and 508 transitions. [2018-10-27 04:01:28,161 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 04:01:28,161 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 508 transitions. [2018-10-27 04:01:28,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-10-27 04:01:28,164 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:28,165 INFO L375 BasicCegarLoop]: trace histogram [15, 12, 12, 11, 11, 11, 11, 11, 11, 11, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:28,165 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:28,165 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:28,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1485660182, now seen corresponding path program 10 times [2018-10-27 04:01:28,165 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:28,166 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:28,166 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:28,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:28,167 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:28,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:28,472 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-27 04:01:28,472 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:28,472 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:28,472 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:28,473 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:28,473 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:28,473 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 [2018-10-27 04:01:28,481 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:28,481 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:01:28,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:28,576 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:28,607 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-27 04:01:28,608 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:28,862 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2018-10-27 04:01:28,884 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:28,885 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2018-10-27 04:01:28,885 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:28,885 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 04:01:28,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 04:01:28,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 04:01:28,886 INFO L87 Difference]: Start difference. First operand 368 states and 508 transitions. Second operand 15 states. [2018-10-27 04:01:29,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:29,762 INFO L93 Difference]: Finished difference Result 862 states and 1225 transitions. [2018-10-27 04:01:29,762 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 04:01:29,763 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 165 [2018-10-27 04:01:29,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:29,766 INFO L225 Difference]: With dead ends: 862 [2018-10-27 04:01:29,766 INFO L226 Difference]: Without dead ends: 535 [2018-10-27 04:01:29,768 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2018-10-27 04:01:29,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2018-10-27 04:01:29,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 394. [2018-10-27 04:01:29,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 394 states. [2018-10-27 04:01:29,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 544 transitions. [2018-10-27 04:01:29,827 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 544 transitions. Word has length 165 [2018-10-27 04:01:29,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:29,828 INFO L481 AbstractCegarLoop]: Abstraction has 394 states and 544 transitions. [2018-10-27 04:01:29,828 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 04:01:29,828 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 544 transitions. [2018-10-27 04:01:29,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-10-27 04:01:29,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:29,831 INFO L375 BasicCegarLoop]: trace histogram [16, 13, 13, 12, 12, 12, 12, 12, 12, 12, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:29,831 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:29,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:29,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1005051572, now seen corresponding path program 11 times [2018-10-27 04:01:29,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:29,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:29,833 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:29,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:29,833 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:29,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:30,330 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2018-10-27 04:01:30,330 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:30,330 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:30,330 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:30,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:30,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:30,331 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 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 [2018-10-27 04:01:30,339 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:01:30,339 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:01:30,420 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 04:01:30,421 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:30,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:30,554 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 145 proven. 50 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2018-10-27 04:01:30,555 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:31,113 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2018-10-27 04:01:31,286 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 145 proven. 50 refuted. 0 times theorem prover too weak. 669 trivial. 0 not checked. [2018-10-27 04:01:31,325 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:31,325 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10, 10] total 31 [2018-10-27 04:01:31,325 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:31,326 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 04:01:31,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 04:01:31,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2018-10-27 04:01:31,327 INFO L87 Difference]: Start difference. First operand 394 states and 544 transitions. Second operand 23 states. [2018-10-27 04:01:32,957 WARN L179 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-27 04:01:34,204 WARN L179 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-27 04:01:38,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:38,649 INFO L93 Difference]: Finished difference Result 2277 states and 3269 transitions. [2018-10-27 04:01:38,649 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2018-10-27 04:01:38,649 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 175 [2018-10-27 04:01:38,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:38,659 INFO L225 Difference]: With dead ends: 2277 [2018-10-27 04:01:38,659 INFO L226 Difference]: Without dead ends: 1924 [2018-10-27 04:01:38,665 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3647, Invalid=9235, Unknown=0, NotChecked=0, Total=12882 [2018-10-27 04:01:38,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1924 states. [2018-10-27 04:01:38,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1924 to 438. [2018-10-27 04:01:38,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 438 states. [2018-10-27 04:01:38,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 608 transitions. [2018-10-27 04:01:38,758 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 608 transitions. Word has length 175 [2018-10-27 04:01:38,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:38,758 INFO L481 AbstractCegarLoop]: Abstraction has 438 states and 608 transitions. [2018-10-27 04:01:38,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 04:01:38,759 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 608 transitions. [2018-10-27 04:01:38,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-10-27 04:01:38,762 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:38,762 INFO L375 BasicCegarLoop]: trace histogram [18, 14, 14, 13, 13, 13, 13, 13, 13, 13, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:38,763 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:38,763 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:38,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1770266243, now seen corresponding path program 12 times [2018-10-27 04:01:38,763 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:38,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:38,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:38,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:38,764 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:38,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:39,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-27 04:01:39,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:39,094 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:39,094 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:39,094 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:39,094 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:39,094 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 [2018-10-27 04:01:39,103 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:01:39,103 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:01:39,209 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:01:39,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:39,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:39,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-27 04:01:39,255 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:39,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1062 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 802 trivial. 0 not checked. [2018-10-27 04:01:39,567 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:39,568 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2018-10-27 04:01:39,568 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:39,568 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 04:01:39,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 04:01:39,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 04:01:39,569 INFO L87 Difference]: Start difference. First operand 438 states and 608 transitions. Second operand 17 states. [2018-10-27 04:01:40,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:40,438 INFO L93 Difference]: Finished difference Result 1032 states and 1475 transitions. [2018-10-27 04:01:40,439 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 04:01:40,439 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 195 [2018-10-27 04:01:40,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:40,442 INFO L225 Difference]: With dead ends: 1032 [2018-10-27 04:01:40,442 INFO L226 Difference]: Without dead ends: 641 [2018-10-27 04:01:40,444 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 376 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=465, Invalid=465, Unknown=0, NotChecked=0, Total=930 [2018-10-27 04:01:40,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2018-10-27 04:01:40,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 464. [2018-10-27 04:01:40,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 464 states. [2018-10-27 04:01:40,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 644 transitions. [2018-10-27 04:01:40,533 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 644 transitions. Word has length 195 [2018-10-27 04:01:40,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:40,534 INFO L481 AbstractCegarLoop]: Abstraction has 464 states and 644 transitions. [2018-10-27 04:01:40,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 04:01:40,534 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 644 transitions. [2018-10-27 04:01:40,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-10-27 04:01:40,538 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:40,538 INFO L375 BasicCegarLoop]: trace histogram [19, 15, 15, 14, 14, 14, 14, 14, 14, 14, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:40,539 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:40,539 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:40,539 INFO L82 PathProgramCache]: Analyzing trace with hash -2012988639, now seen corresponding path program 13 times [2018-10-27 04:01:40,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:40,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:40,540 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:40,541 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:40,541 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:40,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:41,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-27 04:01:41,143 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:41,144 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:41,144 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:41,144 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:41,144 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:41,144 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 [2018-10-27 04:01:41,154 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:41,154 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:01:41,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:41,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:41,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-27 04:01:41,316 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:41,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1206 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 905 trivial. 0 not checked. [2018-10-27 04:01:41,677 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:41,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 33 [2018-10-27 04:01:41,678 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:41,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 04:01:41,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 04:01:41,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 04:01:41,679 INFO L87 Difference]: Start difference. First operand 464 states and 644 transitions. Second operand 18 states. [2018-10-27 04:01:42,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:42,215 INFO L93 Difference]: Finished difference Result 1081 states and 1544 transitions. [2018-10-27 04:01:42,215 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 04:01:42,215 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 205 [2018-10-27 04:01:42,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:42,220 INFO L225 Difference]: With dead ends: 1081 [2018-10-27 04:01:42,220 INFO L226 Difference]: Without dead ends: 667 [2018-10-27 04:01:42,222 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 395 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=528, Invalid=528, Unknown=0, NotChecked=0, Total=1056 [2018-10-27 04:01:42,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2018-10-27 04:01:42,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 490. [2018-10-27 04:01:42,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2018-10-27 04:01:42,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 680 transitions. [2018-10-27 04:01:42,330 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 680 transitions. Word has length 205 [2018-10-27 04:01:42,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:42,330 INFO L481 AbstractCegarLoop]: Abstraction has 490 states and 680 transitions. [2018-10-27 04:01:42,330 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 04:01:42,331 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 680 transitions. [2018-10-27 04:01:42,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-10-27 04:01:42,334 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:42,334 INFO L375 BasicCegarLoop]: trace histogram [20, 16, 16, 15, 15, 15, 15, 15, 15, 15, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:42,334 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:42,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:42,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1457442685, now seen corresponding path program 14 times [2018-10-27 04:01:42,335 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:42,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:42,336 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:42,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:42,336 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:42,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:42,953 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 1015 trivial. 0 not checked. [2018-10-27 04:01:42,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:42,954 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:42,954 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:42,954 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:42,954 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:42,954 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 [2018-10-27 04:01:42,967 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:01:42,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:01:43,108 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-10-27 04:01:43,108 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:43,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:43,303 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 212 proven. 80 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2018-10-27 04:01:43,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:43,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1360 backedges. 212 proven. 80 refuted. 0 times theorem prover too weak. 1068 trivial. 0 not checked. [2018-10-27 04:01:43,666 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:43,666 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 11, 11] total 36 [2018-10-27 04:01:43,666 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:43,667 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 04:01:43,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 04:01:43,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1000, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 04:01:43,668 INFO L87 Difference]: Start difference. First operand 490 states and 680 transitions. Second operand 27 states. [2018-10-27 04:01:52,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:52,924 INFO L93 Difference]: Finished difference Result 3146 states and 4528 transitions. [2018-10-27 04:01:52,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2018-10-27 04:01:52,925 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 215 [2018-10-27 04:01:52,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:52,939 INFO L225 Difference]: With dead ends: 3146 [2018-10-27 04:01:52,940 INFO L226 Difference]: Without dead ends: 2706 [2018-10-27 04:01:52,951 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 667 GetRequests, 515 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8108 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=6680, Invalid=16882, Unknown=0, NotChecked=0, Total=23562 [2018-10-27 04:01:52,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2706 states. [2018-10-27 04:01:53,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2706 to 534. [2018-10-27 04:01:53,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 534 states. [2018-10-27 04:01:53,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 534 states to 534 states and 744 transitions. [2018-10-27 04:01:53,120 INFO L78 Accepts]: Start accepts. Automaton has 534 states and 744 transitions. Word has length 215 [2018-10-27 04:01:53,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:53,121 INFO L481 AbstractCegarLoop]: Abstraction has 534 states and 744 transitions. [2018-10-27 04:01:53,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 04:01:53,121 INFO L276 IsEmpty]: Start isEmpty. Operand 534 states and 744 transitions. [2018-10-27 04:01:53,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-10-27 04:01:53,125 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:53,125 INFO L375 BasicCegarLoop]: trace histogram [22, 17, 17, 16, 16, 16, 16, 16, 16, 16, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:53,125 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:53,126 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:53,126 INFO L82 PathProgramCache]: Analyzing trace with hash 202859342, now seen corresponding path program 15 times [2018-10-27 04:01:53,126 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:53,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:53,127 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:53,127 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:53,127 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:53,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:55,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-27 04:01:55,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:55,052 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:55,052 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:55,052 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:55,052 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:55,052 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 [2018-10-27 04:01:55,063 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:01:55,063 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:01:55,197 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:01:55,197 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:01:55,204 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:55,352 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-27 04:01:55,353 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:01:56,157 INFO L134 CoverageAnalysis]: Checked inductivity of 1606 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 1214 trivial. 0 not checked. [2018-10-27 04:01:56,183 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:01:56,183 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 37 [2018-10-27 04:01:56,184 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:01:56,184 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 04:01:56,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 04:01:56,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 04:01:56,186 INFO L87 Difference]: Start difference. First operand 534 states and 744 transitions. Second operand 20 states. [2018-10-27 04:01:56,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:01:56,871 INFO L93 Difference]: Finished difference Result 1251 states and 1794 transitions. [2018-10-27 04:01:56,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 04:01:56,871 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 235 [2018-10-27 04:01:56,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:01:56,875 INFO L225 Difference]: With dead ends: 1251 [2018-10-27 04:01:56,876 INFO L226 Difference]: Without dead ends: 773 [2018-10-27 04:01:56,878 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 488 GetRequests, 453 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=666, Invalid=666, Unknown=0, NotChecked=0, Total=1332 [2018-10-27 04:01:56,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2018-10-27 04:01:57,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 560. [2018-10-27 04:01:57,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 560 states. [2018-10-27 04:01:57,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 560 states to 560 states and 780 transitions. [2018-10-27 04:01:57,036 INFO L78 Accepts]: Start accepts. Automaton has 560 states and 780 transitions. Word has length 235 [2018-10-27 04:01:57,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:01:57,037 INFO L481 AbstractCegarLoop]: Abstraction has 560 states and 780 transitions. [2018-10-27 04:01:57,037 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 04:01:57,037 INFO L276 IsEmpty]: Start isEmpty. Operand 560 states and 780 transitions. [2018-10-27 04:01:57,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-10-27 04:01:57,041 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:01:57,041 INFO L375 BasicCegarLoop]: trace histogram [23, 18, 18, 17, 17, 17, 17, 17, 17, 17, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:01:57,042 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:01:57,042 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:01:57,042 INFO L82 PathProgramCache]: Analyzing trace with hash 249227952, now seen corresponding path program 16 times [2018-10-27 04:01:57,042 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:01:57,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:57,044 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:01:57,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:01:57,044 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:01:57,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:58,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-27 04:01:58,780 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:58,780 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:01:58,780 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:01:58,780 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:01:58,781 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:01:58,781 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 [2018-10-27 04:01:58,792 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:01:58,793 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:01:58,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:01:58,951 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:01:59,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-27 04:01:59,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:02:00,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1782 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 1340 trivial. 0 not checked. [2018-10-27 04:02:00,360 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:02:00,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2018-10-27 04:02:00,360 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:02:00,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 04:02:00,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 04:02:00,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 04:02:00,363 INFO L87 Difference]: Start difference. First operand 560 states and 780 transitions. Second operand 21 states. [2018-10-27 04:02:01,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:02:01,383 INFO L93 Difference]: Finished difference Result 1300 states and 1863 transitions. [2018-10-27 04:02:01,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 04:02:01,383 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 245 [2018-10-27 04:02:01,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:02:01,389 INFO L225 Difference]: With dead ends: 1300 [2018-10-27 04:02:01,389 INFO L226 Difference]: Without dead ends: 799 [2018-10-27 04:02:01,392 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 509 GetRequests, 472 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=741, Invalid=741, Unknown=0, NotChecked=0, Total=1482 [2018-10-27 04:02:01,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2018-10-27 04:02:01,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 586. [2018-10-27 04:02:01,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 586 states. [2018-10-27 04:02:01,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 586 states to 586 states and 816 transitions. [2018-10-27 04:02:01,556 INFO L78 Accepts]: Start accepts. Automaton has 586 states and 816 transitions. Word has length 245 [2018-10-27 04:02:01,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:02:01,557 INFO L481 AbstractCegarLoop]: Abstraction has 586 states and 816 transitions. [2018-10-27 04:02:01,557 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 04:02:01,557 INFO L276 IsEmpty]: Start isEmpty. Operand 586 states and 816 transitions. [2018-10-27 04:02:01,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 256 [2018-10-27 04:02:01,561 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:02:01,561 INFO L375 BasicCegarLoop]: trace histogram [24, 19, 19, 18, 18, 18, 18, 18, 18, 18, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:02:01,561 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:02:01,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:02:01,562 INFO L82 PathProgramCache]: Analyzing trace with hash -1964715826, now seen corresponding path program 17 times [2018-10-27 04:02:01,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:02:01,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:01,563 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:02:01,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:01,563 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:02:01,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:01,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 1473 trivial. 0 not checked. [2018-10-27 04:02:01,966 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:01,966 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:02:01,966 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:02:01,966 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:02:01,967 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:01,967 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 [2018-10-27 04:02:01,976 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:02:01,976 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:02:02,128 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-10-27 04:02:02,129 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:02:02,137 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:02:02,488 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 291 proven. 117 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2018-10-27 04:02:02,488 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:02:02,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1968 backedges. 291 proven. 117 refuted. 0 times theorem prover too weak. 1560 trivial. 0 not checked. [2018-10-27 04:02:02,982 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:02:02,983 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12, 12] total 41 [2018-10-27 04:02:02,983 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:02:02,984 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 04:02:02,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 04:02:02,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=1294, Unknown=0, NotChecked=0, Total=1640 [2018-10-27 04:02:02,985 INFO L87 Difference]: Start difference. First operand 586 states and 816 transitions. Second operand 31 states. [2018-10-27 04:02:12,500 WARN L179 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-27 04:02:17,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:02:17,422 INFO L93 Difference]: Finished difference Result 4147 states and 5979 transitions. [2018-10-27 04:02:17,422 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 182 states. [2018-10-27 04:02:17,423 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 255 [2018-10-27 04:02:17,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:02:17,437 INFO L225 Difference]: With dead ends: 4147 [2018-10-27 04:02:17,437 INFO L226 Difference]: Without dead ends: 3620 [2018-10-27 04:02:17,441 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 829 GetRequests, 631 SyntacticMatches, 0 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14642 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=11259, Invalid=28541, Unknown=0, NotChecked=0, Total=39800 [2018-10-27 04:02:17,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3620 states. [2018-10-27 04:02:17,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3620 to 630. [2018-10-27 04:02:17,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 630 states. [2018-10-27 04:02:17,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 630 states to 630 states and 880 transitions. [2018-10-27 04:02:17,622 INFO L78 Accepts]: Start accepts. Automaton has 630 states and 880 transitions. Word has length 255 [2018-10-27 04:02:17,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:02:17,622 INFO L481 AbstractCegarLoop]: Abstraction has 630 states and 880 transitions. [2018-10-27 04:02:17,622 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 04:02:17,622 INFO L276 IsEmpty]: Start isEmpty. Operand 630 states and 880 transitions. [2018-10-27 04:02:17,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-10-27 04:02:17,629 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:02:17,629 INFO L375 BasicCegarLoop]: trace histogram [26, 20, 20, 19, 19, 19, 19, 19, 19, 19, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:02:17,629 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:02:17,629 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:02:17,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1157906275, now seen corresponding path program 18 times [2018-10-27 04:02:17,630 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:02:17,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:17,631 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:02:17,631 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:17,631 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:02:17,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:18,084 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-27 04:02:18,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:18,085 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:02:18,085 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:02:18,085 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:02:18,085 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:18,085 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 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 [2018-10-27 04:02:18,095 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:02:18,095 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:02:18,256 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:02:18,257 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:02:18,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:02:18,430 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-27 04:02:18,431 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:02:19,294 INFO L134 CoverageAnalysis]: Checked inductivity of 2262 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2018-10-27 04:02:19,317 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:02:19,318 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2018-10-27 04:02:19,318 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:02:19,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 04:02:19,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 04:02:19,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 04:02:19,320 INFO L87 Difference]: Start difference. First operand 630 states and 880 transitions. Second operand 23 states. [2018-10-27 04:02:20,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:02:20,326 INFO L93 Difference]: Finished difference Result 1470 states and 2113 transitions. [2018-10-27 04:02:20,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 04:02:20,329 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 275 [2018-10-27 04:02:20,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:02:20,333 INFO L225 Difference]: With dead ends: 1470 [2018-10-27 04:02:20,333 INFO L226 Difference]: Without dead ends: 905 [2018-10-27 04:02:20,336 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 530 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=903, Invalid=903, Unknown=0, NotChecked=0, Total=1806 [2018-10-27 04:02:20,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 905 states. [2018-10-27 04:02:20,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 905 to 656. [2018-10-27 04:02:20,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 656 states. [2018-10-27 04:02:20,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 656 states to 656 states and 916 transitions. [2018-10-27 04:02:20,575 INFO L78 Accepts]: Start accepts. Automaton has 656 states and 916 transitions. Word has length 275 [2018-10-27 04:02:20,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:02:20,575 INFO L481 AbstractCegarLoop]: Abstraction has 656 states and 916 transitions. [2018-10-27 04:02:20,575 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 04:02:20,576 INFO L276 IsEmpty]: Start isEmpty. Operand 656 states and 916 transitions. [2018-10-27 04:02:20,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2018-10-27 04:02:20,580 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:02:20,580 INFO L375 BasicCegarLoop]: trace histogram [27, 21, 21, 20, 20, 20, 20, 20, 20, 20, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:02:20,580 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:02:20,581 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:02:20,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1671641925, now seen corresponding path program 19 times [2018-10-27 04:02:20,581 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:02:20,582 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:20,582 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:02:20,583 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:20,583 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:02:20,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:21,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 04:02:21,126 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:21,126 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:02:21,126 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:02:21,126 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:02:21,127 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:21,127 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 [2018-10-27 04:02:21,136 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:02:21,136 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:02:21,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:21,308 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:02:21,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 04:02:21,380 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:02:22,051 INFO L134 CoverageAnalysis]: Checked inductivity of 2470 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2018-10-27 04:02:22,075 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:02:22,076 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2018-10-27 04:02:22,076 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:02:22,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 04:02:22,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 04:02:22,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 04:02:22,078 INFO L87 Difference]: Start difference. First operand 656 states and 916 transitions. Second operand 24 states. [2018-10-27 04:02:23,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:02:23,081 INFO L93 Difference]: Finished difference Result 1519 states and 2182 transitions. [2018-10-27 04:02:23,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 04:02:23,081 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 285 [2018-10-27 04:02:23,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:02:23,087 INFO L225 Difference]: With dead ends: 1519 [2018-10-27 04:02:23,087 INFO L226 Difference]: Without dead ends: 931 [2018-10-27 04:02:23,089 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 549 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2018-10-27 04:02:23,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 931 states. [2018-10-27 04:02:23,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 931 to 682. [2018-10-27 04:02:23,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 682 states. [2018-10-27 04:02:23,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 682 states to 682 states and 952 transitions. [2018-10-27 04:02:23,261 INFO L78 Accepts]: Start accepts. Automaton has 682 states and 952 transitions. Word has length 285 [2018-10-27 04:02:23,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:02:23,261 INFO L481 AbstractCegarLoop]: Abstraction has 682 states and 952 transitions. [2018-10-27 04:02:23,261 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 04:02:23,261 INFO L276 IsEmpty]: Start isEmpty. Operand 682 states and 952 transitions. [2018-10-27 04:02:23,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2018-10-27 04:02:23,264 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:02:23,265 INFO L375 BasicCegarLoop]: trace histogram [28, 22, 22, 21, 21, 21, 21, 21, 21, 21, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:02:23,265 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:02:23,265 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:02:23,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1483218275, now seen corresponding path program 20 times [2018-10-27 04:02:23,266 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:02:23,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:23,267 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:02:23,267 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:23,267 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:02:23,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:23,814 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 0 proven. 672 refuted. 0 times theorem prover too weak. 2016 trivial. 0 not checked. [2018-10-27 04:02:23,815 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:23,815 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:02:23,815 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:02:23,815 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:02:23,816 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:23,816 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 [2018-10-27 04:02:23,826 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:02:23,826 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:02:24,005 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 04:02:24,005 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:02:24,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:02:24,416 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 382 proven. 161 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-27 04:02:24,417 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:02:24,893 INFO L134 CoverageAnalysis]: Checked inductivity of 2688 backedges. 382 proven. 161 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-10-27 04:02:24,918 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:02:24,918 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 46 [2018-10-27 04:02:24,918 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:02:24,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-10-27 04:02:24,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-10-27 04:02:24,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=445, Invalid=1625, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 04:02:24,920 INFO L87 Difference]: Start difference. First operand 682 states and 952 transitions. Second operand 35 states. [2018-10-27 04:02:28,096 WARN L179 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 11 [2018-10-27 04:02:45,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:02:45,033 INFO L93 Difference]: Finished difference Result 5280 states and 7622 transitions. [2018-10-27 04:02:45,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 232 states. [2018-10-27 04:02:45,033 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 295 [2018-10-27 04:02:45,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:02:45,055 INFO L225 Difference]: With dead ends: 5280 [2018-10-27 04:02:45,056 INFO L226 Difference]: Without dead ends: 4666 [2018-10-27 04:02:45,067 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1003 GetRequests, 738 SyntacticMatches, 15 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25982 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=17825, Invalid=45427, Unknown=0, NotChecked=0, Total=63252 [2018-10-27 04:02:45,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4666 states. [2018-10-27 04:02:45,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4666 to 726. [2018-10-27 04:02:45,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 726 states. [2018-10-27 04:02:45,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 726 states to 726 states and 1016 transitions. [2018-10-27 04:02:45,337 INFO L78 Accepts]: Start accepts. Automaton has 726 states and 1016 transitions. Word has length 295 [2018-10-27 04:02:45,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:02:45,337 INFO L481 AbstractCegarLoop]: Abstraction has 726 states and 1016 transitions. [2018-10-27 04:02:45,337 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-10-27 04:02:45,337 INFO L276 IsEmpty]: Start isEmpty. Operand 726 states and 1016 transitions. [2018-10-27 04:02:45,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 316 [2018-10-27 04:02:45,341 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:02:45,341 INFO L375 BasicCegarLoop]: trace histogram [30, 23, 23, 22, 22, 22, 22, 22, 22, 22, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:02:45,341 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:02:45,341 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:02:45,342 INFO L82 PathProgramCache]: Analyzing trace with hash 1730421864, now seen corresponding path program 21 times [2018-10-27 04:02:45,342 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:02:45,342 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:45,343 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:02:45,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:45,343 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:02:45,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:46,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-27 04:02:46,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:46,315 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:02:46,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:02:46,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:02:46,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:46,316 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 [2018-10-27 04:02:46,324 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:02:46,324 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:02:46,501 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:02:46,501 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:02:46,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:02:46,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-27 04:02:46,628 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:02:47,412 INFO L134 CoverageAnalysis]: Checked inductivity of 3030 backedges. 0 proven. 737 refuted. 0 times theorem prover too weak. 2293 trivial. 0 not checked. [2018-10-27 04:02:47,435 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:02:47,435 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2018-10-27 04:02:47,436 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:02:47,436 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 04:02:47,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 04:02:47,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 04:02:47,437 INFO L87 Difference]: Start difference. First operand 726 states and 1016 transitions. Second operand 26 states. [2018-10-27 04:02:48,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:02:48,427 INFO L93 Difference]: Finished difference Result 1689 states and 2432 transitions. [2018-10-27 04:02:48,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 04:02:48,427 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 315 [2018-10-27 04:02:48,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:02:48,434 INFO L225 Difference]: With dead ends: 1689 [2018-10-27 04:02:48,434 INFO L226 Difference]: Without dead ends: 1037 [2018-10-27 04:02:48,437 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 607 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1176, Invalid=1176, Unknown=0, NotChecked=0, Total=2352 [2018-10-27 04:02:48,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1037 states. [2018-10-27 04:02:48,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1037 to 752. [2018-10-27 04:02:48,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 752 states. [2018-10-27 04:02:48,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 752 states to 752 states and 1052 transitions. [2018-10-27 04:02:48,687 INFO L78 Accepts]: Start accepts. Automaton has 752 states and 1052 transitions. Word has length 315 [2018-10-27 04:02:48,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:02:48,687 INFO L481 AbstractCegarLoop]: Abstraction has 752 states and 1052 transitions. [2018-10-27 04:02:48,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 04:02:48,688 INFO L276 IsEmpty]: Start isEmpty. Operand 752 states and 1052 transitions. [2018-10-27 04:02:48,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-10-27 04:02:48,692 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:02:48,692 INFO L375 BasicCegarLoop]: trace histogram [31, 24, 24, 23, 23, 23, 23, 23, 23, 23, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:02:48,693 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:02:48,693 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:02:48,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1371253686, now seen corresponding path program 22 times [2018-10-27 04:02:48,693 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:02:48,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:48,694 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:02:48,694 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:48,695 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:02:48,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:49,559 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-27 04:02:49,559 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:49,560 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:02:49,560 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:02:49,560 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:02:49,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:49,560 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 [2018-10-27 04:02:49,569 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:02:49,570 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:02:49,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:49,757 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:02:49,923 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-27 04:02:49,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:02:50,729 INFO L134 CoverageAnalysis]: Checked inductivity of 3270 backedges. 0 proven. 805 refuted. 0 times theorem prover too weak. 2465 trivial. 0 not checked. [2018-10-27 04:02:50,752 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:02:50,752 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2018-10-27 04:02:50,752 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:02:50,753 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 04:02:50,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 04:02:50,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 04:02:50,754 INFO L87 Difference]: Start difference. First operand 752 states and 1052 transitions. Second operand 27 states. [2018-10-27 04:02:52,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:02:52,002 INFO L93 Difference]: Finished difference Result 1738 states and 2501 transitions. [2018-10-27 04:02:52,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 04:02:52,002 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 325 [2018-10-27 04:02:52,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:02:52,010 INFO L225 Difference]: With dead ends: 1738 [2018-10-27 04:02:52,010 INFO L226 Difference]: Without dead ends: 1063 [2018-10-27 04:02:52,013 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 626 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1275, Invalid=1275, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 04:02:52,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1063 states. [2018-10-27 04:02:52,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1063 to 778. [2018-10-27 04:02:52,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 778 states. [2018-10-27 04:02:52,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 778 states to 778 states and 1088 transitions. [2018-10-27 04:02:52,247 INFO L78 Accepts]: Start accepts. Automaton has 778 states and 1088 transitions. Word has length 325 [2018-10-27 04:02:52,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:02:52,247 INFO L481 AbstractCegarLoop]: Abstraction has 778 states and 1088 transitions. [2018-10-27 04:02:52,248 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 04:02:52,248 INFO L276 IsEmpty]: Start isEmpty. Operand 778 states and 1088 transitions. [2018-10-27 04:02:52,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2018-10-27 04:02:52,252 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:02:52,252 INFO L375 BasicCegarLoop]: trace histogram [32, 25, 25, 24, 24, 24, 24, 24, 24, 24, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:02:52,253 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:02:52,253 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:02:52,253 INFO L82 PathProgramCache]: Analyzing trace with hash 686129640, now seen corresponding path program 23 times [2018-10-27 04:02:52,253 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:02:52,254 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:52,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:02:52,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:02:52,255 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:02:52,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:02:53,227 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 0 proven. 876 refuted. 0 times theorem prover too weak. 2644 trivial. 0 not checked. [2018-10-27 04:02:53,227 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:53,227 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:02:53,227 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:02:53,228 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:02:53,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:02:53,228 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 [2018-10-27 04:02:53,317 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:02:53,317 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:02:53,540 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-27 04:02:53,540 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:02:53,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:02:53,840 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 485 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-10-27 04:02:53,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:02:54,607 INFO L134 CoverageAnalysis]: Checked inductivity of 3520 backedges. 485 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-10-27 04:02:54,630 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:02:54,631 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14, 14] total 51 [2018-10-27 04:02:54,631 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:02:54,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-10-27 04:02:54,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-10-27 04:02:54,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=557, Invalid=1993, Unknown=0, NotChecked=0, Total=2550 [2018-10-27 04:02:54,633 INFO L87 Difference]: Start difference. First operand 778 states and 1088 transitions. Second operand 39 states. [2018-10-27 04:03:20,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:03:20,119 INFO L93 Difference]: Finished difference Result 6545 states and 9457 transitions. [2018-10-27 04:03:20,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2018-10-27 04:03:20,119 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 335 [2018-10-27 04:03:20,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:03:20,145 INFO L225 Difference]: With dead ends: 6545 [2018-10-27 04:03:20,146 INFO L226 Difference]: Without dead ends: 5844 [2018-10-27 04:03:20,153 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1189 GetRequests, 881 SyntacticMatches, 0 SemanticMatches, 308 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40665 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=26873, Invalid=68917, Unknown=0, NotChecked=0, Total=95790 [2018-10-27 04:03:20,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5844 states. [2018-10-27 04:03:20,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5844 to 822. [2018-10-27 04:03:20,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 822 states. [2018-10-27 04:03:20,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 822 states to 822 states and 1152 transitions. [2018-10-27 04:03:20,471 INFO L78 Accepts]: Start accepts. Automaton has 822 states and 1152 transitions. Word has length 335 [2018-10-27 04:03:20,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:03:20,471 INFO L481 AbstractCegarLoop]: Abstraction has 822 states and 1152 transitions. [2018-10-27 04:03:20,471 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-10-27 04:03:20,471 INFO L276 IsEmpty]: Start isEmpty. Operand 822 states and 1152 transitions. [2018-10-27 04:03:20,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2018-10-27 04:03:20,476 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:03:20,476 INFO L375 BasicCegarLoop]: trace histogram [34, 26, 26, 25, 25, 25, 25, 25, 25, 25, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:03:20,477 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:03:20,477 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:03:20,477 INFO L82 PathProgramCache]: Analyzing trace with hash 115900855, now seen corresponding path program 24 times [2018-10-27 04:03:20,477 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:03:20,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:03:20,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:03:20,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:03:20,478 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:03:20,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:03:21,114 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-27 04:03:21,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:03:21,115 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:03:21,115 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:03:21,115 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:03:21,115 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:03:21,116 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 [2018-10-27 04:03:21,131 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:03:21,132 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:03:21,328 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:03:21,328 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:03:21,338 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:03:21,507 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-27 04:03:21,507 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:03:22,559 INFO L134 CoverageAnalysis]: Checked inductivity of 3910 backedges. 0 proven. 950 refuted. 0 times theorem prover too weak. 2960 trivial. 0 not checked. [2018-10-27 04:03:22,582 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:03:22,583 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2018-10-27 04:03:22,583 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:03:22,583 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 04:03:22,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 04:03:22,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 04:03:22,585 INFO L87 Difference]: Start difference. First operand 822 states and 1152 transitions. Second operand 29 states. [2018-10-27 04:03:23,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:03:23,941 INFO L93 Difference]: Finished difference Result 1908 states and 2751 transitions. [2018-10-27 04:03:23,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 04:03:23,942 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 355 [2018-10-27 04:03:23,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:03:23,952 INFO L225 Difference]: With dead ends: 1908 [2018-10-27 04:03:23,952 INFO L226 Difference]: Without dead ends: 1169 [2018-10-27 04:03:23,956 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 684 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1485, Invalid=1485, Unknown=0, NotChecked=0, Total=2970 [2018-10-27 04:03:23,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1169 states. [2018-10-27 04:03:24,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1169 to 848. [2018-10-27 04:03:24,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 848 states. [2018-10-27 04:03:24,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 848 states to 848 states and 1188 transitions. [2018-10-27 04:03:24,393 INFO L78 Accepts]: Start accepts. Automaton has 848 states and 1188 transitions. Word has length 355 [2018-10-27 04:03:24,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:03:24,393 INFO L481 AbstractCegarLoop]: Abstraction has 848 states and 1188 transitions. [2018-10-27 04:03:24,393 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 04:03:24,394 INFO L276 IsEmpty]: Start isEmpty. Operand 848 states and 1188 transitions. [2018-10-27 04:03:24,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2018-10-27 04:03:24,396 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:03:24,396 INFO L375 BasicCegarLoop]: trace histogram [35, 27, 27, 26, 26, 26, 26, 26, 26, 26, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:03:24,397 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:03:24,397 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:03:24,397 INFO L82 PathProgramCache]: Analyzing trace with hash 796020053, now seen corresponding path program 25 times [2018-10-27 04:03:24,397 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:03:24,397 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:03:24,398 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:03:24,398 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:03:24,398 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:03:24,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:03:25,050 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-27 04:03:25,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:03:25,050 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:03:25,050 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:03:25,050 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:03:25,050 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:03:25,050 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 [2018-10-27 04:03:25,058 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:03:25,058 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:03:25,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:03:25,261 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:03:25,429 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-27 04:03:25,429 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:03:26,312 INFO L134 CoverageAnalysis]: Checked inductivity of 4182 backedges. 0 proven. 1027 refuted. 0 times theorem prover too weak. 3155 trivial. 0 not checked. [2018-10-27 04:03:26,333 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:03:26,334 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 57 [2018-10-27 04:03:26,334 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:03:26,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 04:03:26,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 04:03:26,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 04:03:26,336 INFO L87 Difference]: Start difference. First operand 848 states and 1188 transitions. Second operand 30 states. [2018-10-27 04:03:27,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:03:27,493 INFO L93 Difference]: Finished difference Result 1957 states and 2820 transitions. [2018-10-27 04:03:27,493 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 04:03:27,493 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 365 [2018-10-27 04:03:27,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:03:27,500 INFO L225 Difference]: With dead ends: 1957 [2018-10-27 04:03:27,500 INFO L226 Difference]: Without dead ends: 1195 [2018-10-27 04:03:27,502 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 758 GetRequests, 703 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1596, Invalid=1596, Unknown=0, NotChecked=0, Total=3192 [2018-10-27 04:03:27,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1195 states. [2018-10-27 04:03:27,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1195 to 874. [2018-10-27 04:03:27,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 874 states. [2018-10-27 04:03:27,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 1224 transitions. [2018-10-27 04:03:27,940 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 1224 transitions. Word has length 365 [2018-10-27 04:03:27,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:03:27,940 INFO L481 AbstractCegarLoop]: Abstraction has 874 states and 1224 transitions. [2018-10-27 04:03:27,940 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 04:03:27,940 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 1224 transitions. [2018-10-27 04:03:27,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2018-10-27 04:03:27,943 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:03:27,944 INFO L375 BasicCegarLoop]: trace histogram [36, 28, 28, 27, 27, 27, 27, 27, 27, 27, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:03:27,944 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:03:27,944 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:03:27,944 INFO L82 PathProgramCache]: Analyzing trace with hash -521686089, now seen corresponding path program 26 times [2018-10-27 04:03:27,944 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:03:27,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:03:27,945 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:03:27,945 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:03:27,945 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:03:27,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:03:28,492 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 0 proven. 1107 refuted. 0 times theorem prover too weak. 3357 trivial. 0 not checked. [2018-10-27 04:03:28,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:03:28,493 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:03:28,493 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:03:28,493 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:03:28,493 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:03:28,493 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 [2018-10-27 04:03:28,503 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:03:28,503 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:03:28,866 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-10-27 04:03:28,866 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:03:28,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:03:29,526 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 600 proven. 270 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2018-10-27 04:03:29,526 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:03:30,240 INFO L134 CoverageAnalysis]: Checked inductivity of 4464 backedges. 600 proven. 270 refuted. 0 times theorem prover too weak. 3594 trivial. 0 not checked. [2018-10-27 04:03:30,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:03:30,263 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 15, 15] total 56 [2018-10-27 04:03:30,263 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:03:30,263 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-10-27 04:03:30,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-10-27 04:03:30,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=682, Invalid=2398, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 04:03:30,264 INFO L87 Difference]: Start difference. First operand 874 states and 1224 transitions. Second operand 43 states. [2018-10-27 04:04:04,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:04:04,780 INFO L93 Difference]: Finished difference Result 7942 states and 11484 transitions. [2018-10-27 04:04:04,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 350 states. [2018-10-27 04:04:04,780 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 375 [2018-10-27 04:04:04,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:04:04,796 INFO L225 Difference]: With dead ends: 7942 [2018-10-27 04:04:04,796 INFO L226 Difference]: Without dead ends: 7154 [2018-10-27 04:04:04,806 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 1387 GetRequests, 1015 SyntacticMatches, 0 SemanticMatches, 372 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62504 ImplicationChecksByTransitivity, 16.1s TimeCoverageRelationStatistics Valid=38952, Invalid=100550, Unknown=0, NotChecked=0, Total=139502 [2018-10-27 04:04:04,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7154 states. [2018-10-27 04:04:05,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7154 to 918. [2018-10-27 04:04:05,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 918 states. [2018-10-27 04:04:05,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 918 states to 918 states and 1288 transitions. [2018-10-27 04:04:05,405 INFO L78 Accepts]: Start accepts. Automaton has 918 states and 1288 transitions. Word has length 375 [2018-10-27 04:04:05,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:04:05,405 INFO L481 AbstractCegarLoop]: Abstraction has 918 states and 1288 transitions. [2018-10-27 04:04:05,405 INFO L482 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-10-27 04:04:05,406 INFO L276 IsEmpty]: Start isEmpty. Operand 918 states and 1288 transitions. [2018-10-27 04:04:05,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2018-10-27 04:04:05,410 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:04:05,410 INFO L375 BasicCegarLoop]: trace histogram [38, 29, 29, 28, 28, 28, 28, 28, 28, 28, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:04:05,410 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:04:05,411 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:04:05,411 INFO L82 PathProgramCache]: Analyzing trace with hash 907486338, now seen corresponding path program 27 times [2018-10-27 04:04:05,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:04:05,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:04:05,412 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:04:05,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:04:05,412 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:04:05,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:04:06,604 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-27 04:04:06,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:04:06,605 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:04:06,605 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:04:06,605 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:04:06,605 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:04:06,605 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 [2018-10-27 04:04:06,614 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 04:04:06,614 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 04:04:06,820 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 04:04:06,821 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:04:06,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:04:06,924 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-27 04:04:06,925 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:04:09,204 INFO L134 CoverageAnalysis]: Checked inductivity of 4902 backedges. 0 proven. 1190 refuted. 0 times theorem prover too weak. 3712 trivial. 0 not checked. [2018-10-27 04:04:09,227 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:04:09,227 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 61 [2018-10-27 04:04:09,227 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:04:09,228 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 04:04:09,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 04:04:09,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 04:04:09,229 INFO L87 Difference]: Start difference. First operand 918 states and 1288 transitions. Second operand 32 states. [2018-10-27 04:04:10,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:04:10,589 INFO L93 Difference]: Finished difference Result 2127 states and 3070 transitions. [2018-10-27 04:04:10,589 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 04:04:10,589 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 395 [2018-10-27 04:04:10,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:04:10,592 INFO L225 Difference]: With dead ends: 2127 [2018-10-27 04:04:10,592 INFO L226 Difference]: Without dead ends: 1301 [2018-10-27 04:04:10,595 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 761 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1830, Invalid=1830, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 04:04:10,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1301 states. [2018-10-27 04:04:11,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1301 to 944. [2018-10-27 04:04:11,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 944 states. [2018-10-27 04:04:11,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 944 states to 944 states and 1324 transitions. [2018-10-27 04:04:11,044 INFO L78 Accepts]: Start accepts. Automaton has 944 states and 1324 transitions. Word has length 395 [2018-10-27 04:04:11,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:04:11,045 INFO L481 AbstractCegarLoop]: Abstraction has 944 states and 1324 transitions. [2018-10-27 04:04:11,045 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 04:04:11,045 INFO L276 IsEmpty]: Start isEmpty. Operand 944 states and 1324 transitions. [2018-10-27 04:04:11,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2018-10-27 04:04:11,048 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:04:11,048 INFO L375 BasicCegarLoop]: trace histogram [39, 30, 30, 29, 29, 29, 29, 29, 29, 29, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:04:11,048 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:04:11,048 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:04:11,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1397759204, now seen corresponding path program 28 times [2018-10-27 04:04:11,049 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:04:11,049 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:04:11,049 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 04:04:11,050 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:04:11,050 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:04:11,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:04:11,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-27 04:04:11,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:04:11,709 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:04:11,710 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:04:11,710 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:04:11,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:04:11,710 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 [2018-10-27 04:04:11,717 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:04:11,717 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 04:04:11,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:04:11,940 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:04:12,021 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-27 04:04:12,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:04:13,390 INFO L134 CoverageAnalysis]: Checked inductivity of 5206 backedges. 0 proven. 1276 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2018-10-27 04:04:13,412 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:04:13,412 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2018-10-27 04:04:13,412 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:04:13,413 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 04:04:13,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 04:04:13,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 04:04:13,414 INFO L87 Difference]: Start difference. First operand 944 states and 1324 transitions. Second operand 33 states. [2018-10-27 04:04:14,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 04:04:14,927 INFO L93 Difference]: Finished difference Result 2176 states and 3139 transitions. [2018-10-27 04:04:14,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 04:04:14,928 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 405 [2018-10-27 04:04:14,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 04:04:14,931 INFO L225 Difference]: With dead ends: 2176 [2018-10-27 04:04:14,931 INFO L226 Difference]: Without dead ends: 1327 [2018-10-27 04:04:14,934 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 841 GetRequests, 780 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1953, Invalid=1953, Unknown=0, NotChecked=0, Total=3906 [2018-10-27 04:04:14,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1327 states. [2018-10-27 04:04:15,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1327 to 970. [2018-10-27 04:04:15,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 970 states. [2018-10-27 04:04:15,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 970 states to 970 states and 1360 transitions. [2018-10-27 04:04:15,410 INFO L78 Accepts]: Start accepts. Automaton has 970 states and 1360 transitions. Word has length 405 [2018-10-27 04:04:15,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 04:04:15,411 INFO L481 AbstractCegarLoop]: Abstraction has 970 states and 1360 transitions. [2018-10-27 04:04:15,411 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 04:04:15,411 INFO L276 IsEmpty]: Start isEmpty. Operand 970 states and 1360 transitions. [2018-10-27 04:04:15,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 416 [2018-10-27 04:04:15,416 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 04:04:15,417 INFO L375 BasicCegarLoop]: trace histogram [40, 31, 31, 30, 30, 30, 30, 30, 30, 30, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 04:04:15,417 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 04:04:15,417 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 04:04:15,417 INFO L82 PathProgramCache]: Analyzing trace with hash 2078831106, now seen corresponding path program 29 times [2018-10-27 04:04:15,417 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 04:04:15,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:04:15,418 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 04:04:15,418 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 04:04:15,418 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 04:04:15,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 04:04:16,101 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 0 proven. 1365 refuted. 0 times theorem prover too weak. 4155 trivial. 0 not checked. [2018-10-27 04:04:16,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:04:16,102 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 04:04:16,102 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 04:04:16,102 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 04:04:16,102 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 04:04:16,102 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 [2018-10-27 04:04:16,114 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 04:04:16,114 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 04:04:16,426 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 04:04:16,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 04:04:16,433 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 04:04:16,857 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 727 proven. 335 refuted. 0 times theorem prover too weak. 4458 trivial. 0 not checked. [2018-10-27 04:04:16,858 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 04:04:17,623 INFO L134 CoverageAnalysis]: Checked inductivity of 5520 backedges. 727 proven. 335 refuted. 0 times theorem prover too weak. 4458 trivial. 0 not checked. [2018-10-27 04:04:17,645 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 04:04:17,646 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16, 16] total 61 [2018-10-27 04:04:17,646 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 04:04:17,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-10-27 04:04:17,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-10-27 04:04:17,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=820, Invalid=2840, Unknown=0, NotChecked=0, Total=3660 [2018-10-27 04:04:17,649 INFO L87 Difference]: Start difference. First operand 970 states and 1360 transitions. Second operand 47 states. Received shutdown request... [2018-10-27 04:04:48,110 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 339 states. [2018-10-27 04:04:48,111 WARN L550 AbstractCegarLoop]: Verification canceled [2018-10-27 04:04:48,115 WARN L205 ceAbstractionStarter]: Timeout [2018-10-27 04:04:48,115 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 04:04:48 BoogieIcfgContainer [2018-10-27 04:04:48,115 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-27 04:04:48,116 INFO L168 Benchmark]: Toolchain (without parser) took 230306.30 ms. Allocated memory was 1.5 GB in the beginning and 4.1 GB in the end (delta: 2.6 GB). Free memory was 1.4 GB in the beginning and 1.6 GB in the end (delta: -178.4 MB). Peak memory consumption was 2.4 GB. Max. memory is 7.1 GB. [2018-10-27 04:04:48,116 INFO L168 Benchmark]: CDTParser took 0.21 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. [2018-10-27 04:04:48,117 INFO L168 Benchmark]: CACSL2BoogieTranslator took 521.82 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: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. [2018-10-27 04:04:48,117 INFO L168 Benchmark]: Boogie Procedure Inliner took 87.04 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. [2018-10-27 04:04:48,118 INFO L168 Benchmark]: Boogie Preprocessor took 73.71 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. [2018-10-27 04:04:48,118 INFO L168 Benchmark]: RCFGBuilder took 830.23 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 717.8 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -758.9 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. [2018-10-27 04:04:48,119 INFO L168 Benchmark]: TraceAbstraction took 228788.17 ms. Allocated memory was 2.2 GB in the beginning and 4.1 GB in the end (delta: 1.9 GB). Free memory was 2.1 GB in the beginning and 1.6 GB in the end (delta: 556.8 MB). Peak memory consumption was 2.4 GB. Max. memory is 7.1 GB. [2018-10-27 04:04:48,122 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 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. * CACSL2BoogieTranslator took 521.82 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: 13.2 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 87.04 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 73.71 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. * RCFGBuilder took 830.23 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 717.8 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -758.9 MB). Peak memory consumption was 16.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 228788.17 ms. Allocated memory was 2.2 GB in the beginning and 4.1 GB in the end (delta: 1.9 GB). Free memory was 2.1 GB in the beginning and 1.6 GB in the end (delta: 556.8 MB). Peak memory consumption was 2.4 GB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was constructing difference of abstraction (970states) and FLOYD_HOARE automaton (currently 339 states, 47 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 366 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 55 locations, 1 error locations. TIMEOUT Result, 228.7s OverallTime, 33 OverallIterations, 40 TraceHistogramMax, 166.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 7024 SDtfs, 75956 SDslu, 40594 SDs, 0 SdLazy, 48102 SolverSat, 25029 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 53.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 16989 GetRequests, 14390 SyntacticMatches, 15 SemanticMatches, 2583 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217171 ImplicationChecksByTransitivity, 101.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=970occurred in iteration=32, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 5.9s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 5.3s AutomataMinimizationTime, 32 MinimizatonAttempts, 27461 StatesRemovedByMinimization, 31 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.9s SsaConstructionTime, 4.4s SatisfiabilityAnalysisTime, 42.7s InterpolantComputationTime, 13578 NumberOfCodeBlocks, 12568 NumberOfCodeBlocksAsserted, 139 NumberOfCheckSat, 20258 ConstructedInterpolants, 0 QuantifiedInterpolants, 10760600 SizeOfPredicates, 62 NumberOfNonLiveVariables, 22502 ConjunctsInSsa, 493 ConjunctsInUnsatCore, 95 InterpolantComputations, 4 PerfectInterpolantSequences, 139906/175128 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown