java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-1dbac8b [2018-10-27 09:07:40,341 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-27 09:07:40,343 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-27 09:07:40,355 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-27 09:07:40,356 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-27 09:07:40,357 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-27 09:07:40,358 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-27 09:07:40,360 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-27 09:07:40,361 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-27 09:07:40,362 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-27 09:07:40,364 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-27 09:07:40,364 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-27 09:07:40,366 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-27 09:07:40,367 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-27 09:07:40,370 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-27 09:07:40,371 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-27 09:07:40,372 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-27 09:07:40,374 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-27 09:07:40,376 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-27 09:07:40,377 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-27 09:07:40,379 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-27 09:07:40,380 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-27 09:07:40,382 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-27 09:07:40,383 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-27 09:07:40,383 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-27 09:07:40,384 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-27 09:07:40,385 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-27 09:07:40,386 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-27 09:07:40,386 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-27 09:07:40,388 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-27 09:07:40,388 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-27 09:07:40,388 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-10-27 09:07:40,391 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-10-27 09:07:40,406 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-27 09:07:40,407 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-27 09:07:40,407 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-27 09:07:40,408 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-27 09:07:40,408 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-27 09:07:40,408 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-27 09:07:40,408 INFO L133 SettingsManager]: * Explicit value domain=true [2018-10-27 09:07:40,408 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-27 09:07:40,409 INFO L133 SettingsManager]: * Octagon Domain=false [2018-10-27 09:07:40,409 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-27 09:07:40,409 INFO L133 SettingsManager]: * Log string format=TERM [2018-10-27 09:07:40,409 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-27 09:07:40,409 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-27 09:07:40,409 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-27 09:07:40,410 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-27 09:07:40,410 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-27 09:07:40,411 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-27 09:07:40,411 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-27 09:07:40,411 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-27 09:07:40,411 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-27 09:07:40,411 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-27 09:07:40,412 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-27 09:07:40,412 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-27 09:07:40,412 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-27 09:07:40,412 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-27 09:07:40,412 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-27 09:07:40,413 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-27 09:07:40,413 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-27 09:07:40,414 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-27 09:07:40,414 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-27 09:07:40,414 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-27 09:07:40,414 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-27 09:07:40,414 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-27 09:07:40,414 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-27 09:07:40,415 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-10-27 09:07:40,415 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-10-27 09:07:40,481 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-27 09:07:40,500 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-27 09:07:40,503 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-27 09:07:40,505 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-27 09:07:40,506 INFO L276 PluginConnector]: CDTParser initialized [2018-10-27 09:07:40,506 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-27 09:07:40,562 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/7b5abc919/56a1606b312340c0a7408e5f5cafaf81/FLAG145b7ec32 [2018-10-27 09:07:41,074 INFO L298 CDTParser]: Found 1 translation units. [2018-10-27 09:07:41,075 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-10-27 09:07:41,081 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/7b5abc919/56a1606b312340c0a7408e5f5cafaf81/FLAG145b7ec32 [2018-10-27 09:07:41,098 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/7b5abc919/56a1606b312340c0a7408e5f5cafaf81 [2018-10-27 09:07:41,109 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-27 09:07:41,111 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-10-27 09:07:41,112 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-27 09:07:41,112 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-27 09:07:41,116 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-27 09:07:41,117 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,121 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c237445 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41, skipping insertion in model container [2018-10-27 09:07:41,121 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,132 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-27 09:07:41,156 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-27 09:07:41,390 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:07:41,395 INFO L189 MainTranslator]: Completed pre-run [2018-10-27 09:07:41,414 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-27 09:07:41,433 INFO L193 MainTranslator]: Completed translation [2018-10-27 09:07:41,434 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41 WrapperNode [2018-10-27 09:07:41,434 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-27 09:07:41,435 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-27 09:07:41,435 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-27 09:07:41,435 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-27 09:07:41,446 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,452 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,459 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-27 09:07:41,460 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-27 09:07:41,460 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-27 09:07:41,460 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-27 09:07:41,471 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,471 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,472 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,472 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,476 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,484 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,485 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (1/1) ... [2018-10-27 09:07:41,487 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-27 09:07:41,489 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-27 09:07:41,489 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-27 09:07:41,489 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-27 09:07:41,490 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (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 09:07:41,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-27 09:07:41,630 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-27 09:07:41,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-27 09:07:41,630 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-27 09:07:41,630 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-27 09:07:41,630 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-27 09:07:41,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-27 09:07:41,631 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-27 09:07:41,812 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-27 09:07:41,813 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:07:41 BoogieIcfgContainer [2018-10-27 09:07:41,813 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-27 09:07:41,814 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-27 09:07:41,814 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-27 09:07:41,818 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-27 09:07:41,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 09:07:41" (1/3) ... [2018-10-27 09:07:41,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@570d153c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:07:41, skipping insertion in model container [2018-10-27 09:07:41,819 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 09:07:41" (2/3) ... [2018-10-27 09:07:41,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@570d153c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 09:07:41, skipping insertion in model container [2018-10-27 09:07:41,820 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 09:07:41" (3/3) ... [2018-10-27 09:07:41,821 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call4.i [2018-10-27 09:07:41,832 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-27 09:07:41,840 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-27 09:07:41,859 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-27 09:07:41,895 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-27 09:07:41,896 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-27 09:07:41,896 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-27 09:07:41,896 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-27 09:07:41,896 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-27 09:07:41,896 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-27 09:07:41,896 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-27 09:07:41,897 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-27 09:07:41,918 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-27 09:07:41,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-27 09:07:41,936 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:41,938 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:41,942 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:41,949 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:41,949 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-10-27 09:07:41,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:42,011 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:42,011 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:42,012 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:42,012 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:42,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:42,067 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 09:07:42,069 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:42,070 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-27 09:07:42,070 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:42,074 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-27 09:07:42,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-27 09:07:42,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-27 09:07:42,094 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-27 09:07:42,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:42,126 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-27 09:07:42,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-27 09:07:42,128 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-27 09:07:42,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:42,137 INFO L225 Difference]: With dead ends: 29 [2018-10-27 09:07:42,137 INFO L226 Difference]: Without dead ends: 12 [2018-10-27 09:07:42,142 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 09:07:42,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-27 09:07:42,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-27 09:07:42,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-27 09:07:42,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-27 09:07:42,185 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-27 09:07:42,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:42,185 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-27 09:07:42,185 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-27 09:07:42,186 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-27 09:07:42,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-27 09:07:42,186 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:42,186 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:42,187 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:42,187 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:42,187 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-10-27 09:07:42,187 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:42,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:42,189 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:42,189 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:42,189 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:42,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:42,367 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 09:07:42,367 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-27 09:07:42,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-27 09:07:42,368 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-27 09:07:42,370 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-27 09:07:42,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-27 09:07:42,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:42,371 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-10-27 09:07:42,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:42,431 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-27 09:07:42,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-27 09:07:42,450 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-27 09:07:42,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:42,451 INFO L225 Difference]: With dead ends: 19 [2018-10-27 09:07:42,451 INFO L226 Difference]: Without dead ends: 14 [2018-10-27 09:07:42,453 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-27 09:07:42,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-27 09:07:42,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-27 09:07:42,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-27 09:07:42,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-27 09:07:42,465 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-27 09:07:42,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:42,466 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-27 09:07:42,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-27 09:07:42,466 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-27 09:07:42,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-27 09:07:42,467 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:42,467 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:42,467 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:42,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:42,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-10-27 09:07:42,468 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:42,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:42,469 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:42,469 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:42,469 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:42,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:42,610 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:42,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:42,611 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:42,612 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-27 09:07:42,614 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35] [2018-10-27 09:07:42,650 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-10-27 09:07:42,650 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-27 09:07:42,846 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-27 09:07:42,847 INFO L272 AbstractInterpreter]: Visited 12 different actions 25 times. Merged at 3 different actions 7 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-10-27 09:07:42,860 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:42,861 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-27 09:07:42,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:42,862 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 09:07:42,878 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:42,878 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:42,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:42,912 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:42,977 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:42,977 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:43,084 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:43,108 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:43,108 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-10-27 09:07:43,108 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:43,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-27 09:07:43,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-27 09:07:43,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:07:43,109 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-10-27 09:07:43,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:43,139 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-27 09:07:43,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-27 09:07:43,140 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-10-27 09:07:43,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:43,141 INFO L225 Difference]: With dead ends: 21 [2018-10-27 09:07:43,141 INFO L226 Difference]: Without dead ends: 16 [2018-10-27 09:07:43,142 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-10-27 09:07:43,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-27 09:07:43,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-27 09:07:43,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-27 09:07:43,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-27 09:07:43,146 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-27 09:07:43,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:43,146 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-27 09:07:43,146 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-27 09:07:43,146 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-27 09:07:43,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-27 09:07:43,147 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:43,147 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:43,148 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:43,148 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:43,148 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-10-27 09:07:43,148 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:43,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:43,149 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:43,149 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:43,150 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:43,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:43,339 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:43,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:43,339 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:43,339 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:43,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:43,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:43,340 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 09:07:43,351 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:43,351 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:43,390 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-27 09:07:43,390 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:43,392 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:43,414 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:43,415 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:43,658 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:43,680 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:43,680 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2018-10-27 09:07:43,680 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:43,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-27 09:07:43,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-27 09:07:43,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 09:07:43,682 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-10-27 09:07:43,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:43,716 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-27 09:07:43,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-27 09:07:43,717 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-10-27 09:07:43,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:43,718 INFO L225 Difference]: With dead ends: 23 [2018-10-27 09:07:43,718 INFO L226 Difference]: Without dead ends: 18 [2018-10-27 09:07:43,719 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-10-27 09:07:43,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-27 09:07:43,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-27 09:07:43,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-27 09:07:43,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-27 09:07:43,723 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-27 09:07:43,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:43,724 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-27 09:07:43,724 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-27 09:07:43,724 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-27 09:07:43,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-27 09:07:43,725 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:43,725 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:43,725 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:43,726 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:43,726 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-10-27 09:07:43,726 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:43,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:43,727 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:43,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:43,728 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:43,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:43,831 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:43,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:43,831 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:43,831 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:43,832 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:43,832 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:43,832 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 09:07:43,842 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:43,842 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:43,872 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:43,872 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:43,874 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:43,905 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:43,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:44,108 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:44,129 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:44,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-10-27 09:07:44,130 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:44,130 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-27 09:07:44,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-27 09:07:44,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 09:07:44,133 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-10-27 09:07:44,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:44,177 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-27 09:07:44,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-27 09:07:44,178 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-10-27 09:07:44,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:44,179 INFO L225 Difference]: With dead ends: 25 [2018-10-27 09:07:44,182 INFO L226 Difference]: Without dead ends: 20 [2018-10-27 09:07:44,183 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-10-27 09:07:44,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-27 09:07:44,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-27 09:07:44,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-27 09:07:44,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-27 09:07:44,187 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-27 09:07:44,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:44,188 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-27 09:07:44,188 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-27 09:07:44,188 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-27 09:07:44,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-27 09:07:44,189 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:44,190 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:44,190 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:44,190 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:44,190 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-10-27 09:07:44,191 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:44,191 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:44,192 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:44,192 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:44,192 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:44,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:44,450 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:44,450 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:44,451 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:44,451 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:44,451 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:44,451 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:44,451 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 09:07:44,466 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:44,466 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:44,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:44,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:44,498 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:44,498 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:44,938 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:44,959 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:44,959 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 12 [2018-10-27 09:07:44,960 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:44,960 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-27 09:07:44,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-27 09:07:44,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:07:44,961 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-10-27 09:07:45,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:45,010 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-27 09:07:45,011 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-27 09:07:45,011 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-27 09:07:45,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:45,012 INFO L225 Difference]: With dead ends: 27 [2018-10-27 09:07:45,012 INFO L226 Difference]: Without dead ends: 22 [2018-10-27 09:07:45,013 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-10-27 09:07:45,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-27 09:07:45,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-27 09:07:45,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-27 09:07:45,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-27 09:07:45,018 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-27 09:07:45,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:45,018 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-27 09:07:45,018 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-27 09:07:45,018 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-27 09:07:45,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-27 09:07:45,019 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:45,019 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:45,020 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:45,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:45,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-10-27 09:07:45,020 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:45,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:45,021 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:45,022 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:45,022 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:45,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:45,248 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:45,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:45,249 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:45,249 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:45,249 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:45,249 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:45,250 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 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 09:07:45,259 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:45,259 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:45,289 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-27 09:07:45,289 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:45,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:45,310 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:45,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:45,543 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:45,566 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:45,566 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2018-10-27 09:07:45,566 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:45,567 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-27 09:07:45,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-27 09:07:45,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:07:45,568 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-10-27 09:07:45,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:45,663 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-27 09:07:45,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-27 09:07:45,666 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-10-27 09:07:45,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:45,667 INFO L225 Difference]: With dead ends: 29 [2018-10-27 09:07:45,667 INFO L226 Difference]: Without dead ends: 24 [2018-10-27 09:07:45,667 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-10-27 09:07:45,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-27 09:07:45,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-27 09:07:45,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-27 09:07:45,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-27 09:07:45,672 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-27 09:07:45,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:45,673 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-27 09:07:45,673 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-27 09:07:45,673 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-27 09:07:45,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-27 09:07:45,674 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:45,674 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:45,674 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:45,674 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:45,675 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-10-27 09:07:45,675 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:45,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:45,676 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:45,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:45,676 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:45,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:45,937 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:45,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:45,938 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:45,938 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:45,938 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:45,938 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:45,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 09:07:45,948 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:45,948 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:45,977 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:45,977 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:45,979 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:45,991 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:45,991 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:46,237 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:46,269 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:46,269 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2018-10-27 09:07:46,270 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:46,270 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-27 09:07:46,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-27 09:07:46,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:07:46,271 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-10-27 09:07:46,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:46,338 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-27 09:07:46,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-27 09:07:46,340 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-10-27 09:07:46,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:46,341 INFO L225 Difference]: With dead ends: 31 [2018-10-27 09:07:46,341 INFO L226 Difference]: Without dead ends: 26 [2018-10-27 09:07:46,343 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-10-27 09:07:46,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-27 09:07:46,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-27 09:07:46,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-27 09:07:46,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-27 09:07:46,348 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-27 09:07:46,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:46,349 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-27 09:07:46,349 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-27 09:07:46,349 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-27 09:07:46,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-27 09:07:46,350 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:46,350 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:46,350 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:46,350 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:46,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-10-27 09:07:46,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:46,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:46,351 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:46,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:46,352 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:46,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:46,580 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:46,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:46,581 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:46,581 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:46,581 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:46,581 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:46,581 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 09:07:46,589 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:46,589 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:46,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:46,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:46,615 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:46,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:46,902 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:46,923 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:46,924 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2018-10-27 09:07:46,924 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:46,925 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-27 09:07:46,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-27 09:07:46,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:07:46,925 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-10-27 09:07:47,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:47,062 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-27 09:07:47,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-27 09:07:47,063 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-10-27 09:07:47,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:47,064 INFO L225 Difference]: With dead ends: 33 [2018-10-27 09:07:47,064 INFO L226 Difference]: Without dead ends: 28 [2018-10-27 09:07:47,065 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-10-27 09:07:47,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-27 09:07:47,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-27 09:07:47,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-27 09:07:47,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-27 09:07:47,071 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-27 09:07:47,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:47,071 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-27 09:07:47,072 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-27 09:07:47,072 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-27 09:07:47,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-27 09:07:47,072 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:47,073 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:47,073 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:47,073 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:47,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-10-27 09:07:47,073 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:47,074 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:47,074 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:47,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:47,075 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:47,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:47,240 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:47,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:47,241 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:47,241 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:47,241 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:47,241 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:47,242 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 09:07:47,251 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:47,251 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:07:47,339 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-10-27 09:07:47,339 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:47,341 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:47,355 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:47,355 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:47,637 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:47,658 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:47,658 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2018-10-27 09:07:47,658 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:47,659 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-27 09:07:47,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-27 09:07:47,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:07:47,660 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-10-27 09:07:47,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:47,755 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-27 09:07:47,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-27 09:07:47,755 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-10-27 09:07:47,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:47,757 INFO L225 Difference]: With dead ends: 35 [2018-10-27 09:07:47,757 INFO L226 Difference]: Without dead ends: 30 [2018-10-27 09:07:47,759 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-10-27 09:07:47,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-27 09:07:47,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-27 09:07:47,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-27 09:07:47,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-27 09:07:47,764 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-27 09:07:47,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:47,764 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-27 09:07:47,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-27 09:07:47,764 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-27 09:07:47,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-27 09:07:47,765 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:47,766 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:47,766 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:47,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:47,766 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-10-27 09:07:47,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:47,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:47,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:47,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:47,768 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:47,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:48,057 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:48,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:48,058 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:48,058 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:48,058 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:48,058 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:48,058 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 09:07:48,066 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:07:48,066 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:07:48,076 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:07:48,076 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:07:48,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:48,107 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:48,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:48,388 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:48,409 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:48,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2018-10-27 09:07:48,410 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:48,410 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-27 09:07:48,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-27 09:07:48,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 09:07:48,412 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-10-27 09:07:48,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:48,588 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-27 09:07:48,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-27 09:07:48,591 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-10-27 09:07:48,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:48,593 INFO L225 Difference]: With dead ends: 37 [2018-10-27 09:07:48,593 INFO L226 Difference]: Without dead ends: 32 [2018-10-27 09:07:48,594 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-10-27 09:07:48,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-27 09:07:48,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-27 09:07:48,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-27 09:07:48,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-27 09:07:48,599 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-27 09:07:48,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:48,599 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-27 09:07:48,600 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-27 09:07:48,600 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-27 09:07:48,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-27 09:07:48,601 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:48,601 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:48,601 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:48,601 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:48,601 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-10-27 09:07:48,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:48,602 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:48,602 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:07:48,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:48,603 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:48,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:48,834 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:48,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:48,835 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:48,835 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:48,835 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:48,835 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:48,835 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 09:07:48,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:48,847 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:07:48,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:48,878 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:07:48,919 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:48,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:07:49,314 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:49,336 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:07:49,336 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 24 [2018-10-27 09:07:49,336 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:07:49,337 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-27 09:07:49,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-27 09:07:49,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:49,338 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-10-27 09:07:49,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:07:49,457 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-10-27 09:07:49,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-27 09:07:49,458 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-10-27 09:07:49,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:07:49,459 INFO L225 Difference]: With dead ends: 39 [2018-10-27 09:07:49,459 INFO L226 Difference]: Without dead ends: 34 [2018-10-27 09:07:49,461 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-10-27 09:07:49,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-27 09:07:49,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-10-27 09:07:49,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-27 09:07:49,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-10-27 09:07:49,466 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-10-27 09:07:49,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:07:49,467 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-10-27 09:07:49,467 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-27 09:07:49,467 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-10-27 09:07:49,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-10-27 09:07:49,468 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:07:49,468 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:07:49,468 INFO L424 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:07:49,468 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:07:49,469 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-10-27 09:07:49,469 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:07:49,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:49,470 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:07:49,470 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:07:49,471 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:07:49,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:07:49,901 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:07:49,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:49,901 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:07:49,901 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:07:49,902 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:07:49,902 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:07:49,902 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) [2018-10-27 09:07:49,913 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:07:49,913 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:08:04,500 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-10-27 09:08:04,500 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:04,539 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:04,572 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:04,573 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:04,974 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:04,994 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:04,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2018-10-27 09:08:04,995 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:04,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-27 09:08:04,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-27 09:08:04,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:08:04,997 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-10-27 09:08:05,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:05,288 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-10-27 09:08:05,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-27 09:08:05,291 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-10-27 09:08:05,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:05,292 INFO L225 Difference]: With dead ends: 41 [2018-10-27 09:08:05,292 INFO L226 Difference]: Without dead ends: 36 [2018-10-27 09:08:05,293 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-10-27 09:08:05,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-10-27 09:08:05,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-10-27 09:08:05,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-27 09:08:05,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-10-27 09:08:05,298 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-10-27 09:08:05,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:05,298 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-10-27 09:08:05,298 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-27 09:08:05,298 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-10-27 09:08:05,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-27 09:08:05,299 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:05,299 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:05,299 INFO L424 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:05,299 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:05,300 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-10-27 09:08:05,300 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:05,300 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:05,301 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:05,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:05,301 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:05,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:05,663 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:05,663 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:05,663 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:05,663 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:05,663 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:05,664 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:05,664 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 09:08:05,672 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:05,672 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:05,685 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:05,685 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:05,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:05,703 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:05,704 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:06,433 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:06,455 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:06,455 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2018-10-27 09:08:06,455 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:06,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-10-27 09:08:06,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-10-27 09:08:06,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:08:06,456 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-10-27 09:08:06,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:06,603 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-10-27 09:08:06,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-27 09:08:06,603 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-10-27 09:08:06,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:06,604 INFO L225 Difference]: With dead ends: 43 [2018-10-27 09:08:06,605 INFO L226 Difference]: Without dead ends: 38 [2018-10-27 09:08:06,605 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-10-27 09:08:06,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-10-27 09:08:06,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-10-27 09:08:06,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-10-27 09:08:06,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-10-27 09:08:06,610 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-10-27 09:08:06,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:06,610 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-10-27 09:08:06,611 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-10-27 09:08:06,611 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-10-27 09:08:06,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-27 09:08:06,612 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:06,612 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:06,612 INFO L424 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:06,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:06,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-10-27 09:08:06,612 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:06,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:06,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:06,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:06,614 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:06,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:06,840 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:06,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:06,841 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:06,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:06,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:06,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:06,841 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 09:08:06,849 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:06,849 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:06,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:06,866 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:06,905 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:06,906 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:07,472 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:07,494 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:07,495 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2018-10-27 09:08:07,495 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:07,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-27 09:08:07,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-27 09:08:07,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:08:07,496 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-10-27 09:08:07,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:07,850 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-10-27 09:08:07,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-10-27 09:08:07,851 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-10-27 09:08:07,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:07,852 INFO L225 Difference]: With dead ends: 45 [2018-10-27 09:08:07,852 INFO L226 Difference]: Without dead ends: 40 [2018-10-27 09:08:07,857 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-10-27 09:08:07,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-10-27 09:08:07,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-10-27 09:08:07,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-27 09:08:07,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-10-27 09:08:07,861 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-10-27 09:08:07,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:07,861 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-10-27 09:08:07,862 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-27 09:08:07,862 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-10-27 09:08:07,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-27 09:08:07,862 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:07,863 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:07,863 INFO L424 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:07,863 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:07,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-10-27 09:08:07,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:07,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:07,864 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:07,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:07,864 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:07,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:08,482 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:08,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:08,483 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:08,483 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:08,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:08,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:08,483 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 09:08:08,499 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:08,500 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:15,456 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-10-27 09:08:15,456 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:15,463 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:15,476 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:15,476 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:16,065 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:16,086 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:16,086 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2018-10-27 09:08:16,086 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:16,087 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-27 09:08:16,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-27 09:08:16,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:08:16,088 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-10-27 09:08:16,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:16,382 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-10-27 09:08:16,382 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-10-27 09:08:16,382 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-10-27 09:08:16,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:16,383 INFO L225 Difference]: With dead ends: 47 [2018-10-27 09:08:16,383 INFO L226 Difference]: Without dead ends: 42 [2018-10-27 09:08:16,384 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-10-27 09:08:16,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-27 09:08:16,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-10-27 09:08:16,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-10-27 09:08:16,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-10-27 09:08:16,389 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-10-27 09:08:16,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:16,389 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-10-27 09:08:16,389 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-27 09:08:16,390 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-10-27 09:08:16,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-10-27 09:08:16,390 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:16,390 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:16,391 INFO L424 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:16,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:16,391 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-10-27 09:08:16,391 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:16,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:16,392 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:16,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:16,392 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:16,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:16,774 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:16,774 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:16,774 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:16,774 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:16,775 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:16,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:16,775 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 09:08:16,782 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:16,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:16,794 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:16,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:16,796 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:16,872 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:16,873 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:17,468 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:17,490 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:17,490 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2018-10-27 09:08:17,490 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:17,490 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-27 09:08:17,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-27 09:08:17,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:08:17,491 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-10-27 09:08:17,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:17,714 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-10-27 09:08:17,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-27 09:08:17,715 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-10-27 09:08:17,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:17,716 INFO L225 Difference]: With dead ends: 49 [2018-10-27 09:08:17,716 INFO L226 Difference]: Without dead ends: 44 [2018-10-27 09:08:17,717 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-10-27 09:08:17,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-27 09:08:17,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-27 09:08:17,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-27 09:08:17,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-10-27 09:08:17,723 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-10-27 09:08:17,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:17,723 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-10-27 09:08:17,723 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-27 09:08:17,724 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-10-27 09:08:17,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-27 09:08:17,724 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:17,725 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:17,725 INFO L424 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:17,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:17,725 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-10-27 09:08:17,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:17,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:17,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:17,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:17,727 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:17,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:17,981 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:17,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:17,981 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:17,981 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:17,981 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:17,981 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:17,981 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 09:08:17,990 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:17,990 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:18,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:18,005 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:18,042 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:18,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:18,790 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:18,820 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:18,821 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 36 [2018-10-27 09:08:18,821 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:18,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-10-27 09:08:18,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-10-27 09:08:18,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:08:18,823 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-10-27 09:08:19,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:19,178 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-10-27 09:08:19,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-10-27 09:08:19,178 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-10-27 09:08:19,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:19,180 INFO L225 Difference]: With dead ends: 51 [2018-10-27 09:08:19,180 INFO L226 Difference]: Without dead ends: 46 [2018-10-27 09:08:19,181 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-10-27 09:08:19,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-10-27 09:08:19,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-10-27 09:08:19,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-10-27 09:08:19,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-10-27 09:08:19,187 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-10-27 09:08:19,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:19,187 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-10-27 09:08:19,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-10-27 09:08:19,187 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-10-27 09:08:19,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-10-27 09:08:19,188 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:19,189 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:19,189 INFO L424 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:19,189 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:19,189 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-10-27 09:08:19,189 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:19,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:19,190 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:19,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:19,191 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:19,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:19,840 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:19,840 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:19,841 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:19,841 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:19,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:19,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:19,841 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 09:08:19,853 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:19,853 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:27,989 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2018-10-27 09:08:27,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:28,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:28,047 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:28,047 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:28,826 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:28,848 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:28,848 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2018-10-27 09:08:28,848 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:28,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-27 09:08:28,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-27 09:08:28,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:08:28,850 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-10-27 09:08:29,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:29,402 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-10-27 09:08:29,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-10-27 09:08:29,402 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-10-27 09:08:29,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:29,403 INFO L225 Difference]: With dead ends: 53 [2018-10-27 09:08:29,404 INFO L226 Difference]: Without dead ends: 48 [2018-10-27 09:08:29,405 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-10-27 09:08:29,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-10-27 09:08:29,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-10-27 09:08:29,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-10-27 09:08:29,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-10-27 09:08:29,409 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-10-27 09:08:29,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:29,409 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-10-27 09:08:29,409 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-27 09:08:29,409 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-10-27 09:08:29,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-10-27 09:08:29,410 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:29,410 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:29,411 INFO L424 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:29,411 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:29,411 INFO L82 PathProgramCache]: Analyzing trace with hash 723901956, now seen corresponding path program 18 times [2018-10-27 09:08:29,411 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:29,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:29,412 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:29,412 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:29,412 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:29,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:29,769 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:29,769 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:29,770 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:29,770 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:29,770 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:29,770 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:29,770 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 09:08:29,783 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:29,783 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:29,798 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:29,798 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:29,800 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:29,819 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:29,819 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:31,097 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:31,117 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:31,117 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2018-10-27 09:08:31,117 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:31,118 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-10-27 09:08:31,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-10-27 09:08:31,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:08:31,119 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 21 states. [2018-10-27 09:08:31,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:31,585 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-10-27 09:08:31,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-10-27 09:08:31,585 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2018-10-27 09:08:31,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:31,586 INFO L225 Difference]: With dead ends: 55 [2018-10-27 09:08:31,586 INFO L226 Difference]: Without dead ends: 50 [2018-10-27 09:08:31,587 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-10-27 09:08:31,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-10-27 09:08:31,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-10-27 09:08:31,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-10-27 09:08:31,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-10-27 09:08:31,592 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-10-27 09:08:31,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:31,593 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-10-27 09:08:31,593 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-10-27 09:08:31,593 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-10-27 09:08:31,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-10-27 09:08:31,594 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:31,594 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:31,594 INFO L424 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:31,595 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:31,595 INFO L82 PathProgramCache]: Analyzing trace with hash 880063306, now seen corresponding path program 19 times [2018-10-27 09:08:31,595 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:31,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:31,596 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:31,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:31,596 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:31,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:32,027 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:32,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:32,028 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:32,028 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:32,028 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:32,028 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:32,028 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 09:08:32,040 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:32,040 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:32,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:32,056 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:32,095 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:32,095 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:33,542 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:33,563 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:33,563 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2018-10-27 09:08:33,563 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:33,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-27 09:08:33,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-27 09:08:33,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 09:08:33,565 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 22 states. [2018-10-27 09:08:33,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:33,873 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-10-27 09:08:33,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-10-27 09:08:33,874 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-10-27 09:08:33,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:33,875 INFO L225 Difference]: With dead ends: 57 [2018-10-27 09:08:33,875 INFO L226 Difference]: Without dead ends: 52 [2018-10-27 09:08:33,876 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-10-27 09:08:33,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-10-27 09:08:33,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-10-27 09:08:33,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-10-27 09:08:33,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-10-27 09:08:33,882 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-10-27 09:08:33,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:33,882 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-10-27 09:08:33,882 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-27 09:08:33,882 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-10-27 09:08:33,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-10-27 09:08:33,883 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:33,883 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:33,883 INFO L424 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:33,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:33,884 INFO L82 PathProgramCache]: Analyzing trace with hash 627265296, now seen corresponding path program 20 times [2018-10-27 09:08:33,884 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:33,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:33,885 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:33,885 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:33,885 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:33,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:35,116 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:35,116 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:35,116 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:35,117 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:35,117 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:35,117 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:35,117 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 09:08:35,125 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:35,125 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:37,223 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2018-10-27 09:08:37,223 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:37,228 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:37,238 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:37,238 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:39,031 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:39,052 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:39,053 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2018-10-27 09:08:39,053 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:39,053 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-10-27 09:08:39,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-10-27 09:08:39,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:08:39,055 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 23 states. [2018-10-27 09:08:39,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:39,428 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-10-27 09:08:39,430 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-10-27 09:08:39,431 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2018-10-27 09:08:39,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:39,431 INFO L225 Difference]: With dead ends: 59 [2018-10-27 09:08:39,431 INFO L226 Difference]: Without dead ends: 54 [2018-10-27 09:08:39,432 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-10-27 09:08:39,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-10-27 09:08:39,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-10-27 09:08:39,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-10-27 09:08:39,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-10-27 09:08:39,437 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-10-27 09:08:39,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:39,437 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-10-27 09:08:39,437 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-10-27 09:08:39,437 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-10-27 09:08:39,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-10-27 09:08:39,438 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:39,438 INFO L375 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:39,438 INFO L424 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:39,438 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:39,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1793453738, now seen corresponding path program 21 times [2018-10-27 09:08:39,439 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:39,439 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:39,439 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:39,440 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:39,440 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:39,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:39,886 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:39,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:39,886 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:39,886 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:39,886 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:39,886 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:39,886 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 09:08:39,895 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:39,895 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:39,912 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:39,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:39,914 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:39,936 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:39,936 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:41,006 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:41,027 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:41,027 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2018-10-27 09:08:41,027 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:41,027 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-27 09:08:41,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-27 09:08:41,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:08:41,029 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 24 states. [2018-10-27 09:08:41,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:41,378 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-10-27 09:08:41,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-27 09:08:41,379 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2018-10-27 09:08:41,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:41,380 INFO L225 Difference]: With dead ends: 61 [2018-10-27 09:08:41,380 INFO L226 Difference]: Without dead ends: 56 [2018-10-27 09:08:41,381 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-10-27 09:08:41,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-10-27 09:08:41,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-10-27 09:08:41,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-10-27 09:08:41,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-10-27 09:08:41,386 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-10-27 09:08:41,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:41,386 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-10-27 09:08:41,386 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-27 09:08:41,386 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-10-27 09:08:41,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-10-27 09:08:41,387 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:41,387 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:41,388 INFO L424 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:41,388 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:41,388 INFO L82 PathProgramCache]: Analyzing trace with hash -232170980, now seen corresponding path program 22 times [2018-10-27 09:08:41,388 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:41,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:41,389 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:41,389 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:41,389 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:41,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:42,435 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:42,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:42,435 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:42,435 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:42,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:42,436 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:42,436 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 09:08:42,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:42,445 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:42,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:42,462 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:42,481 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:42,481 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:43,660 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:43,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:43,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 48 [2018-10-27 09:08:43,682 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:43,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-27 09:08:43,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-27 09:08:43,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 09:08:43,684 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 25 states. [2018-10-27 09:08:44,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:44,066 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-10-27 09:08:44,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-10-27 09:08:44,067 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2018-10-27 09:08:44,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:44,068 INFO L225 Difference]: With dead ends: 63 [2018-10-27 09:08:44,068 INFO L226 Difference]: Without dead ends: 58 [2018-10-27 09:08:44,069 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 87 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-10-27 09:08:44,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-10-27 09:08:44,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-10-27 09:08:44,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-10-27 09:08:44,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-10-27 09:08:44,073 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-10-27 09:08:44,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:44,073 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-10-27 09:08:44,073 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-27 09:08:44,073 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-10-27 09:08:44,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-10-27 09:08:44,074 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:44,074 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:44,075 INFO L424 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:44,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:44,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1216973154, now seen corresponding path program 23 times [2018-10-27 09:08:44,075 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:44,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:44,076 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:44,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:44,076 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:44,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:44,934 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:44,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:44,934 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:44,934 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:44,934 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:44,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:44,935 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 09:08:44,941 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:44,941 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:45,431 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2018-10-27 09:08:45,431 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:45,439 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:45,463 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:45,463 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:46,892 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:46,913 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:46,913 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2018-10-27 09:08:46,913 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:46,913 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-27 09:08:46,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-27 09:08:46,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 09:08:46,914 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 26 states. [2018-10-27 09:08:47,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:47,410 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2018-10-27 09:08:47,411 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-10-27 09:08:47,411 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 57 [2018-10-27 09:08:47,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:47,412 INFO L225 Difference]: With dead ends: 65 [2018-10-27 09:08:47,412 INFO L226 Difference]: Without dead ends: 60 [2018-10-27 09:08:47,413 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2018-10-27 09:08:47,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-10-27 09:08:47,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-10-27 09:08:47,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-10-27 09:08:47,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-10-27 09:08:47,417 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 57 [2018-10-27 09:08:47,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:47,418 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-10-27 09:08:47,418 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-27 09:08:47,418 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-10-27 09:08:47,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-10-27 09:08:47,419 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:47,419 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:47,419 INFO L424 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:47,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:47,419 INFO L82 PathProgramCache]: Analyzing trace with hash -2019885272, now seen corresponding path program 24 times [2018-10-27 09:08:47,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:47,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:47,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:47,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:47,421 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:47,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:48,698 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:48,698 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:48,698 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:48,698 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:48,698 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:48,699 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:48,699 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 09:08:48,707 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:48,708 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:48,726 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:48,726 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:48,728 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:48,756 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:48,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:50,136 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:50,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:50,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2018-10-27 09:08:50,157 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:50,158 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-10-27 09:08:50,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-10-27 09:08:50,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=726, Invalid=1926, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 09:08:50,159 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 27 states. [2018-10-27 09:08:50,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:50,601 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2018-10-27 09:08:50,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-10-27 09:08:50,602 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 59 [2018-10-27 09:08:50,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:50,603 INFO L225 Difference]: With dead ends: 67 [2018-10-27 09:08:50,603 INFO L226 Difference]: Without dead ends: 62 [2018-10-27 09:08:50,605 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=726, Invalid=1926, Unknown=0, NotChecked=0, Total=2652 [2018-10-27 09:08:50,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2018-10-27 09:08:50,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2018-10-27 09:08:50,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2018-10-27 09:08:50,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2018-10-27 09:08:50,609 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 59 [2018-10-27 09:08:50,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:50,609 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2018-10-27 09:08:50,609 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-10-27 09:08:50,609 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2018-10-27 09:08:50,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-10-27 09:08:50,610 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:50,610 INFO L375 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:50,613 INFO L424 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:50,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:50,613 INFO L82 PathProgramCache]: Analyzing trace with hash 1210456942, now seen corresponding path program 25 times [2018-10-27 09:08:50,613 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:50,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:50,614 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:50,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:50,614 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:50,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:51,190 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:51,190 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:51,191 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:51,191 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:51,191 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:51,191 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:51,191 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 09:08:51,199 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:51,199 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:08:51,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:51,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:51,238 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:51,239 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:53,081 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:53,101 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:53,101 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2018-10-27 09:08:53,101 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:53,102 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-10-27 09:08:53,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-10-27 09:08:53,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 09:08:53,103 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 28 states. [2018-10-27 09:08:53,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:53,583 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-10-27 09:08:53,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-10-27 09:08:53,584 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 61 [2018-10-27 09:08:53,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:53,586 INFO L225 Difference]: With dead ends: 69 [2018-10-27 09:08:53,586 INFO L226 Difference]: Without dead ends: 64 [2018-10-27 09:08:53,588 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2018-10-27 09:08:53,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-10-27 09:08:53,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2018-10-27 09:08:53,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-10-27 09:08:53,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2018-10-27 09:08:53,591 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 61 [2018-10-27 09:08:53,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:53,592 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2018-10-27 09:08:53,592 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-10-27 09:08:53,592 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2018-10-27 09:08:53,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-10-27 09:08:53,592 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:53,593 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:53,593 INFO L424 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:53,593 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:53,593 INFO L82 PathProgramCache]: Analyzing trace with hash 307969588, now seen corresponding path program 26 times [2018-10-27 09:08:53,593 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:53,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:53,594 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:08:53,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:53,594 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:53,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:54,129 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:54,129 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:54,129 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:54,130 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:54,130 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:54,130 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:54,130 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 09:08:54,137 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:08:54,137 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:08:54,249 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2018-10-27 09:08:54,249 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:54,251 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:54,262 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:54,263 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:55,922 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:55,943 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:55,943 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2018-10-27 09:08:55,943 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:55,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-10-27 09:08:55,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-10-27 09:08:55,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=838, Invalid=2242, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:08:55,945 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 29 states. [2018-10-27 09:08:56,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:08:56,456 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2018-10-27 09:08:56,457 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-10-27 09:08:56,457 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 63 [2018-10-27 09:08:56,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:08:56,458 INFO L225 Difference]: With dead ends: 71 [2018-10-27 09:08:56,458 INFO L226 Difference]: Without dead ends: 66 [2018-10-27 09:08:56,460 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=838, Invalid=2242, Unknown=0, NotChecked=0, Total=3080 [2018-10-27 09:08:56,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2018-10-27 09:08:56,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2018-10-27 09:08:56,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-10-27 09:08:56,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-10-27 09:08:56,463 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 63 [2018-10-27 09:08:56,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:08:56,463 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-10-27 09:08:56,464 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-10-27 09:08:56,464 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-10-27 09:08:56,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-10-27 09:08:56,464 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:08:56,464 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:08:56,464 INFO L424 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:08:56,465 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:08:56,465 INFO L82 PathProgramCache]: Analyzing trace with hash 601016186, now seen corresponding path program 27 times [2018-10-27 09:08:56,465 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:08:56,465 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:56,465 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:08:56,466 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:08:56,466 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:08:56,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:08:57,710 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:57,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:57,711 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:08:57,711 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:08:57,711 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:08:57,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:08:57,711 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 09:08:57,719 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:08:57,719 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:08:57,737 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:08:57,738 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:08:57,739 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:08:57,757 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:57,757 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:08:59,455 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:08:59,475 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:08:59,475 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2018-10-27 09:08:59,476 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:08:59,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-10-27 09:08:59,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-10-27 09:08:59,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 09:08:59,478 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 30 states. [2018-10-27 09:09:00,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:00,022 INFO L93 Difference]: Finished difference Result 73 states and 73 transitions. [2018-10-27 09:09:00,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-10-27 09:09:00,022 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 65 [2018-10-27 09:09:00,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:00,023 INFO L225 Difference]: With dead ends: 73 [2018-10-27 09:09:00,023 INFO L226 Difference]: Without dead ends: 68 [2018-10-27 09:09:00,024 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2018-10-27 09:09:00,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-10-27 09:09:00,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2018-10-27 09:09:00,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-10-27 09:09:00,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2018-10-27 09:09:00,028 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 65 [2018-10-27 09:09:00,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:00,028 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2018-10-27 09:09:00,028 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-10-27 09:09:00,029 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2018-10-27 09:09:00,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-10-27 09:09:00,029 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:00,029 INFO L375 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:00,029 INFO L424 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:00,030 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:00,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1249044672, now seen corresponding path program 28 times [2018-10-27 09:09:00,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:00,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:00,031 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:09:00,031 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:00,031 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:00,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:00,902 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:00,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:00,903 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:00,903 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:00,903 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:00,903 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:00,903 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 09:09:00,910 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:00,911 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:09:00,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:00,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:09:00,969 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:00,969 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:09:03,177 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:03,198 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:09:03,198 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2018-10-27 09:09:03,198 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:09:03,198 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-10-27 09:09:03,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-10-27 09:09:03,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=2582, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 09:09:03,199 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 31 states. [2018-10-27 09:09:03,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:09:03,784 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2018-10-27 09:09:03,784 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-10-27 09:09:03,785 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 67 [2018-10-27 09:09:03,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:09:03,786 INFO L225 Difference]: With dead ends: 75 [2018-10-27 09:09:03,786 INFO L226 Difference]: Without dead ends: 70 [2018-10-27 09:09:03,788 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=958, Invalid=2582, Unknown=0, NotChecked=0, Total=3540 [2018-10-27 09:09:03,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-10-27 09:09:03,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2018-10-27 09:09:03,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-10-27 09:09:03,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2018-10-27 09:09:03,802 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 67 [2018-10-27 09:09:03,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:09:03,802 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2018-10-27 09:09:03,802 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-10-27 09:09:03,802 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2018-10-27 09:09:03,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-10-27 09:09:03,803 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:09:03,803 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:09:03,803 INFO L424 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:09:03,803 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:09:03,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1041068666, now seen corresponding path program 29 times [2018-10-27 09:09:03,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:09:03,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:03,804 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:09:03,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:09:03,804 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:09:03,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:09:04,597 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:09:04,597 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:04,597 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:09:04,597 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:09:04,597 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:09:04,598 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:09:04,598 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 09:09:04,605 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:09:04,605 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-27 09:11:19,445 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2018-10-27 09:11:19,445 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:11:19,684 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:19,731 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:19,731 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:21,789 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:21,793 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:21,794 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2018-10-27 09:11:21,794 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:21,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-10-27 09:11:21,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-10-27 09:11:21,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 09:11:21,795 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 32 states. [2018-10-27 09:11:22,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:22,413 INFO L93 Difference]: Finished difference Result 77 states and 77 transitions. [2018-10-27 09:11:22,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-10-27 09:11:22,413 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 69 [2018-10-27 09:11:22,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:22,415 INFO L225 Difference]: With dead ends: 77 [2018-10-27 09:11:22,415 INFO L226 Difference]: Without dead ends: 72 [2018-10-27 09:11:22,416 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2018-10-27 09:11:22,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-10-27 09:11:22,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-10-27 09:11:22,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-10-27 09:11:22,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2018-10-27 09:11:22,420 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 69 [2018-10-27 09:11:22,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:22,420 INFO L481 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2018-10-27 09:11:22,420 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-10-27 09:11:22,420 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2018-10-27 09:11:22,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-10-27 09:11:22,421 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:22,421 INFO L375 BasicCegarLoop]: trace histogram [31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:22,422 INFO L424 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:22,422 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:22,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1255377484, now seen corresponding path program 30 times [2018-10-27 09:11:22,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:22,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:22,423 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:11:22,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:22,423 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:22,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:23,044 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:23,044 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:23,044 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:23,045 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:23,045 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:23,045 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:23,045 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 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 09:11:23,054 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-27 09:11:23,054 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-27 09:11:23,076 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-27 09:11:23,076 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-27 09:11:23,078 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:23,107 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:23,107 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:25,164 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:25,184 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:25,184 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2018-10-27 09:11:25,184 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:25,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-10-27 09:11:25,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-10-27 09:11:25,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1086, Invalid=2946, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 09:11:25,190 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 33 states. [2018-10-27 09:11:26,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:26,004 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2018-10-27 09:11:26,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-10-27 09:11:26,004 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 71 [2018-10-27 09:11:26,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:26,005 INFO L225 Difference]: With dead ends: 79 [2018-10-27 09:11:26,006 INFO L226 Difference]: Without dead ends: 74 [2018-10-27 09:11:26,007 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 111 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1086, Invalid=2946, Unknown=0, NotChecked=0, Total=4032 [2018-10-27 09:11:26,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-10-27 09:11:26,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2018-10-27 09:11:26,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-10-27 09:11:26,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2018-10-27 09:11:26,011 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 71 [2018-10-27 09:11:26,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:26,011 INFO L481 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2018-10-27 09:11:26,011 INFO L482 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-10-27 09:11:26,011 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2018-10-27 09:11:26,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-10-27 09:11:26,012 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:26,012 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:26,012 INFO L424 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:26,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:26,013 INFO L82 PathProgramCache]: Analyzing trace with hash 526937490, now seen corresponding path program 31 times [2018-10-27 09:11:26,013 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:26,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:26,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-27 09:11:26,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:26,014 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:26,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:26,695 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:26,695 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:26,695 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:26,695 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:26,695 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:26,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:26,696 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 09:11:26,710 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:11:26,710 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-27 09:11:26,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:26,734 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-27 09:11:26,754 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:26,754 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-27 09:11:28,999 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:29,019 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-27 09:11:29,020 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2018-10-27 09:11:29,020 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-27 09:11:29,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-10-27 09:11:29,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-10-27 09:11:29,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2018-10-27 09:11:29,021 INFO L87 Difference]: Start difference. First operand 74 states and 74 transitions. Second operand 34 states. [2018-10-27 09:11:29,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-27 09:11:29,722 INFO L93 Difference]: Finished difference Result 81 states and 81 transitions. [2018-10-27 09:11:29,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-10-27 09:11:29,722 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 73 [2018-10-27 09:11:29,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-27 09:11:29,723 INFO L225 Difference]: With dead ends: 81 [2018-10-27 09:11:29,723 INFO L226 Difference]: Without dead ends: 76 [2018-10-27 09:11:29,724 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2018-10-27 09:11:29,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-10-27 09:11:29,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2018-10-27 09:11:29,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2018-10-27 09:11:29,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2018-10-27 09:11:29,728 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 73 [2018-10-27 09:11:29,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-27 09:11:29,728 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2018-10-27 09:11:29,729 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-10-27 09:11:29,729 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2018-10-27 09:11:29,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-10-27 09:11:29,729 INFO L367 BasicCegarLoop]: Found error trace [2018-10-27 09:11:29,729 INFO L375 BasicCegarLoop]: trace histogram [33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-27 09:11:29,730 INFO L424 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-27 09:11:29,730 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-27 09:11:29,730 INFO L82 PathProgramCache]: Analyzing trace with hash 575772504, now seen corresponding path program 32 times [2018-10-27 09:11:29,730 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-27 09:11:29,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:29,731 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-27 09:11:29,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-27 09:11:29,731 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-27 09:11:29,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-27 09:11:30,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-27 09:11:30,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:30,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-27 09:11:30,424 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-27 09:11:30,424 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-27 09:11:30,424 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-27 09:11:30,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-27 09:11:30,431 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-27 09:11:30,431 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown