java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -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/functions_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 10:33:49,366 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 10:33:49,372 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 10:33:49,392 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 10:33:49,392 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 10:33:49,394 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 10:33:49,397 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 10:33:49,400 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 10:33:49,401 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 10:33:49,402 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 10:33:49,403 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 10:33:49,403 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 10:33:49,404 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 10:33:49,405 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 10:33:49,406 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 10:33:49,407 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 10:33:49,408 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 10:33:49,410 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 10:33:49,412 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 10:33:49,413 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 10:33:49,414 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 10:33:49,421 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 10:33:49,423 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 10:33:49,424 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 10:33:49,424 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 10:33:49,425 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 10:33:49,426 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 10:33:49,426 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 10:33:49,427 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 10:33:49,428 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 10:33:49,428 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 10:33:49,429 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 10:33:49,431 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-EXP.epf [2018-11-07 10:33:49,448 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 10:33:49,448 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 10:33:49,449 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 10:33:49,449 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 10:33:49,449 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 10:33:49,450 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 10:33:49,450 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-07 10:33:49,450 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 10:33:49,450 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 10:33:49,450 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 10:33:49,450 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 10:33:49,451 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 10:33:49,451 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 10:33:49,451 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-07 10:33:49,452 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 10:33:49,452 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 10:33:49,452 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 10:33:49,452 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 10:33:49,453 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 10:33:49,453 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 10:33:49,453 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 10:33:49,453 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 10:33:49,453 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 10:33:49,454 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 10:33:49,454 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 10:33:49,454 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 10:33:49,454 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 10:33:49,454 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 10:33:49,455 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 10:33:49,455 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 10:33:49,455 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 10:33:49,455 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 10:33:49,455 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 10:33:49,455 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 10:33:49,456 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 10:33:49,456 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 10:33:49,504 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 10:33:49,520 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 10:33:49,525 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 10:33:49,527 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 10:33:49,527 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 10:33:49,528 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-11-07 10:33:49,592 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c0698d80/68dc783c43024bcc88182b20d85b008f/FLAG538ffe407 [2018-11-07 10:33:50,043 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 10:33:50,044 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/functions_true-unreach-call1_true-termination.i [2018-11-07 10:33:50,050 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c0698d80/68dc783c43024bcc88182b20d85b008f/FLAG538ffe407 [2018-11-07 10:33:50,066 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c0698d80/68dc783c43024bcc88182b20d85b008f [2018-11-07 10:33:50,081 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 10:33:50,084 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 10:33:50,085 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 10:33:50,085 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 10:33:50,093 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 10:33:50,094 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,098 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c193a73 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50, skipping insertion in model container [2018-11-07 10:33:50,098 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,109 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 10:33:50,129 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 10:33:50,375 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 10:33:50,380 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 10:33:50,400 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 10:33:50,418 INFO L193 MainTranslator]: Completed translation [2018-11-07 10:33:50,419 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50 WrapperNode [2018-11-07 10:33:50,419 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 10:33:50,420 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 10:33:50,420 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 10:33:50,420 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 10:33:50,432 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,441 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,447 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 10:33:50,447 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 10:33:50,448 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 10:33:50,448 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 10:33:50,459 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,459 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,460 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,460 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,463 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,467 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,468 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... [2018-11-07 10:33:50,469 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 10:33:50,470 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 10:33:50,470 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 10:33:50,470 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 10:33:50,471 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 10:33:50,605 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 10:33:50,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 10:33:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure f [2018-11-07 10:33:50,606 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2018-11-07 10:33:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 10:33:50,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 10:33:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 10:33:50,607 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 10:33:50,607 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 10:33:50,607 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 10:33:51,007 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 10:33:51,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:33:51 BoogieIcfgContainer [2018-11-07 10:33:51,008 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 10:33:51,009 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 10:33:51,010 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 10:33:51,013 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 10:33:51,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:33:50" (1/3) ... [2018-11-07 10:33:51,014 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1deba3f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:33:51, skipping insertion in model container [2018-11-07 10:33:51,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:33:50" (2/3) ... [2018-11-07 10:33:51,015 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1deba3f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:33:51, skipping insertion in model container [2018-11-07 10:33:51,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:33:51" (3/3) ... [2018-11-07 10:33:51,017 INFO L112 eAbstractionObserver]: Analyzing ICFG functions_true-unreach-call1_true-termination.i [2018-11-07 10:33:51,028 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 10:33:51,036 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 10:33:51,052 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 10:33:51,092 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 10:33:51,093 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 10:33:51,093 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 10:33:51,093 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 10:33:51,093 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 10:33:51,093 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 10:33:51,094 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 10:33:51,094 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 10:33:51,114 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-11-07 10:33:51,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 10:33:51,121 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:51,122 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:51,125 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:51,130 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:51,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1196028990, now seen corresponding path program 1 times [2018-11-07 10:33:51,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:51,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:51,181 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:51,181 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:51,182 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:51,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:51,239 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:51,241 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 10:33:51,241 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 10:33:51,242 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 10:33:51,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 10:33:51,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 10:33:51,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 10:33:51,261 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-11-07 10:33:51,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:51,283 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-11-07 10:33:51,283 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 10:33:51,284 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 10:33:51,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:51,294 INFO L225 Difference]: With dead ends: 34 [2018-11-07 10:33:51,294 INFO L226 Difference]: Without dead ends: 17 [2018-11-07 10:33:51,298 INFO L604 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 [2018-11-07 10:33:51,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-11-07 10:33:51,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-11-07 10:33:51,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-07 10:33:51,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-11-07 10:33:51,339 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 10 [2018-11-07 10:33:51,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:51,340 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-11-07 10:33:51,340 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 10:33:51,341 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-11-07 10:33:51,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 10:33:51,342 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:51,342 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:51,342 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:51,343 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:51,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1888530020, now seen corresponding path program 1 times [2018-11-07 10:33:51,343 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:51,344 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:51,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:51,345 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:51,345 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:51,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:51,561 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:51,563 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 10:33:51,564 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 10:33:51,564 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 10:33:51,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 10:33:51,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 10:33:51,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 10:33:51,567 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-11-07 10:33:51,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:51,644 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2018-11-07 10:33:51,645 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 10:33:51,645 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 10:33:51,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:51,654 INFO L225 Difference]: With dead ends: 26 [2018-11-07 10:33:51,655 INFO L226 Difference]: Without dead ends: 21 [2018-11-07 10:33:51,659 INFO L604 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 [2018-11-07 10:33:51,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-07 10:33:51,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-11-07 10:33:51,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-07 10:33:51,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-11-07 10:33:51,691 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 11 [2018-11-07 10:33:51,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:51,691 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-11-07 10:33:51,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 10:33:51,692 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-11-07 10:33:51,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-11-07 10:33:51,693 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:51,693 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:51,693 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:51,694 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:51,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1261609818, now seen corresponding path program 1 times [2018-11-07 10:33:51,694 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:51,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:51,695 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:51,695 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:51,696 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:51,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:51,932 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:51,933 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:51,933 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:51,934 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-11-07 10:33:51,936 INFO L202 CegarAbsIntRunner]: [0], [1], [2], [6], [10], [14], [16], [18], [24], [27], [29], [35], [36], [37], [39], [40], [41] [2018-11-07 10:33:51,981 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2018-11-07 10:33:51,981 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 10:33:52,142 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 10:33:52,143 INFO L272 AbstractInterpreter]: Visited 17 different actions 25 times. Merged at 4 different actions 4 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-11-07 10:33:52,157 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:52,158 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 10:33:52,158 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:52,159 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:52,179 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:52,180 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:33:52,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:52,215 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:52,284 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:52,284 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:52,624 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-11-07 10:33:52,845 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 10:33:52,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:52,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2018-11-07 10:33:52,866 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:52,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 10:33:52,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 10:33:52,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-11-07 10:33:52,868 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 6 states. [2018-11-07 10:33:53,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:53,010 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-11-07 10:33:53,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 10:33:53,011 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2018-11-07 10:33:53,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:53,012 INFO L225 Difference]: With dead ends: 30 [2018-11-07 10:33:53,012 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 10:33:53,013 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2018-11-07 10:33:53,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 10:33:53,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2018-11-07 10:33:53,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-11-07 10:33:53,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-11-07 10:33:53,022 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2018-11-07 10:33:53,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:53,023 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2018-11-07 10:33:53,023 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 10:33:53,024 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2018-11-07 10:33:53,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-07 10:33:53,026 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:53,026 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:53,026 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:53,026 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:53,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1235124260, now seen corresponding path program 2 times [2018-11-07 10:33:53,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:53,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:53,028 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:53,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:53,028 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:53,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:53,334 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 10:33:53,335 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:53,335 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:53,335 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:53,335 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:53,336 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:53,336 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:53,353 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:33:53,354 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:33:53,384 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 10:33:53,384 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:33:53,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:53,507 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 10:33:53,507 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:54,340 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-07 10:33:54,361 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:54,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 15 [2018-11-07 10:33:54,362 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:54,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-11-07 10:33:54,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-11-07 10:33:54,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2018-11-07 10:33:54,363 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 8 states. [2018-11-07 10:33:54,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:54,523 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-11-07 10:33:54,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 10:33:54,525 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2018-11-07 10:33:54,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:54,527 INFO L225 Difference]: With dead ends: 34 [2018-11-07 10:33:54,527 INFO L226 Difference]: Without dead ends: 29 [2018-11-07 10:33:54,528 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-11-07 10:33:54,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-11-07 10:33:54,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2018-11-07 10:33:54,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-11-07 10:33:54,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2018-11-07 10:33:54,535 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 25 [2018-11-07 10:33:54,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:54,535 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2018-11-07 10:33:54,535 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-11-07 10:33:54,535 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2018-11-07 10:33:54,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 10:33:54,536 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:54,537 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:54,537 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:54,537 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:54,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1046211866, now seen corresponding path program 3 times [2018-11-07 10:33:54,538 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:54,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:54,539 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:33:54,539 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:54,539 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:54,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:54,760 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 10:33:54,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:54,761 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:54,761 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:54,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:54,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:54,761 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:54,770 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:33:54,771 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:33:54,789 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:33:54,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:33:54,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:54,860 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 10:33:54,861 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:55,379 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 10:33:55,408 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:55,409 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 12] total 20 [2018-11-07 10:33:55,409 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:55,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 10:33:55,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 10:33:55,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2018-11-07 10:33:55,411 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 10 states. [2018-11-07 10:33:55,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:55,712 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2018-11-07 10:33:55,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 10:33:55,714 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 10:33:55,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:55,716 INFO L225 Difference]: With dead ends: 38 [2018-11-07 10:33:55,716 INFO L226 Difference]: Without dead ends: 33 [2018-11-07 10:33:55,717 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2018-11-07 10:33:55,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-07 10:33:55,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-11-07 10:33:55,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-11-07 10:33:55,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2018-11-07 10:33:55,723 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 32 [2018-11-07 10:33:55,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:55,724 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2018-11-07 10:33:55,724 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 10:33:55,724 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2018-11-07 10:33:55,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-11-07 10:33:55,726 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:55,726 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:55,727 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:55,727 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:55,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1312440804, now seen corresponding path program 4 times [2018-11-07 10:33:55,727 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:55,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:55,729 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:33:55,729 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:55,729 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:55,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:56,017 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-07 10:33:56,018 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:56,018 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:56,018 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:56,018 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:56,019 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:56,019 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:56,028 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:56,028 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:33:56,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:56,047 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:56,122 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-11-07 10:33:56,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:56,826 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-11-07 10:33:56,847 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:56,847 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 15] total 25 [2018-11-07 10:33:56,847 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:56,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 10:33:56,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 10:33:56,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2018-11-07 10:33:56,849 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 12 states. [2018-11-07 10:33:57,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:57,157 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2018-11-07 10:33:57,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-11-07 10:33:57,158 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2018-11-07 10:33:57,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:57,160 INFO L225 Difference]: With dead ends: 42 [2018-11-07 10:33:57,160 INFO L226 Difference]: Without dead ends: 37 [2018-11-07 10:33:57,161 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 60 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=144, Invalid=668, Unknown=0, NotChecked=0, Total=812 [2018-11-07 10:33:57,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-11-07 10:33:57,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2018-11-07 10:33:57,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-11-07 10:33:57,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2018-11-07 10:33:57,170 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 39 [2018-11-07 10:33:57,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:57,170 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2018-11-07 10:33:57,170 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 10:33:57,170 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2018-11-07 10:33:57,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-11-07 10:33:57,172 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:57,172 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:57,172 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:57,173 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:57,173 INFO L82 PathProgramCache]: Analyzing trace with hash -341760294, now seen corresponding path program 5 times [2018-11-07 10:33:57,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:57,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:57,174 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:33:57,174 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:57,174 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:57,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:57,467 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-11-07 10:33:57,468 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:57,468 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:57,468 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:57,468 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:57,469 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:57,469 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:57,478 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:33:57,479 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:33:57,517 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 10:33:57,518 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:33:57,523 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:57,603 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2018-11-07 10:33:57,603 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:33:58,620 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 10:33:58,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:33:58,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 18] total 30 [2018-11-07 10:33:58,640 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:33:58,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 10:33:58,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 10:33:58,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=747, Unknown=0, NotChecked=0, Total=870 [2018-11-07 10:33:58,643 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 14 states. [2018-11-07 10:33:59,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:33:59,051 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2018-11-07 10:33:59,052 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 10:33:59,052 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 46 [2018-11-07 10:33:59,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:33:59,053 INFO L225 Difference]: With dead ends: 46 [2018-11-07 10:33:59,053 INFO L226 Difference]: Without dead ends: 41 [2018-11-07 10:33:59,054 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 70 SyntacticMatches, 12 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=198, Invalid=992, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 10:33:59,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-11-07 10:33:59,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2018-11-07 10:33:59,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-11-07 10:33:59,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2018-11-07 10:33:59,061 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 46 [2018-11-07 10:33:59,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:33:59,062 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2018-11-07 10:33:59,062 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 10:33:59,062 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2018-11-07 10:33:59,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 10:33:59,063 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:33:59,063 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:33:59,064 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:33:59,064 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:33:59,064 INFO L82 PathProgramCache]: Analyzing trace with hash -2000679844, now seen corresponding path program 6 times [2018-11-07 10:33:59,064 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:33:59,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:59,065 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:33:59,065 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:33:59,065 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:33:59,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:33:59,411 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 10:33:59,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:59,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:33:59,412 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:33:59,412 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:33:59,412 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:33:59,412 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:33:59,421 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:33:59,421 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:33:59,439 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:33:59,440 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:33:59,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:33:59,542 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 10:33:59,542 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:34:00,835 WARN L179 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-11-07 10:34:00,936 WARN L179 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-11-07 10:34:02,618 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 10:34:02,638 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:34:02,638 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 21] total 35 [2018-11-07 10:34:02,638 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:34:02,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 10:34:02,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 10:34:02,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 10:34:02,640 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand 16 states. [2018-11-07 10:34:03,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:34:03,118 INFO L93 Difference]: Finished difference Result 50 states and 57 transitions. [2018-11-07 10:34:03,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 10:34:03,119 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 53 [2018-11-07 10:34:03,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:34:03,121 INFO L225 Difference]: With dead ends: 50 [2018-11-07 10:34:03,121 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 10:34:03,123 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 80 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=260, Invalid=1380, Unknown=0, NotChecked=0, Total=1640 [2018-11-07 10:34:03,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 10:34:03,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-11-07 10:34:03,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-11-07 10:34:03,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2018-11-07 10:34:03,130 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 53 [2018-11-07 10:34:03,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:34:03,130 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2018-11-07 10:34:03,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 10:34:03,131 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2018-11-07 10:34:03,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2018-11-07 10:34:03,132 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:34:03,132 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:34:03,132 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:34:03,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:34:03,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1151446886, now seen corresponding path program 7 times [2018-11-07 10:34:03,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:34:03,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:03,134 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:34:03,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:03,134 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:34:03,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:34:03,680 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-11-07 10:34:03,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:03,680 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:34:03,680 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:34:03,680 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:34:03,681 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:03,681 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:34:03,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:34:03,689 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:34:03,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:34:03,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:34:03,776 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2018-11-07 10:34:03,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:34:04,831 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 0 proven. 140 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 10:34:04,853 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:34:04,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 24] total 40 [2018-11-07 10:34:04,853 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:34:04,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 10:34:04,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 10:34:04,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1363, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 10:34:04,855 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 18 states. [2018-11-07 10:34:05,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:34:05,387 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2018-11-07 10:34:05,387 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 10:34:05,387 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 60 [2018-11-07 10:34:05,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:34:05,389 INFO L225 Difference]: With dead ends: 54 [2018-11-07 10:34:05,390 INFO L226 Difference]: Without dead ends: 49 [2018-11-07 10:34:05,391 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 90 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=330, Invalid=1832, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 10:34:05,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-11-07 10:34:05,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2018-11-07 10:34:05,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-11-07 10:34:05,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2018-11-07 10:34:05,400 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 60 [2018-11-07 10:34:05,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:34:05,400 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2018-11-07 10:34:05,400 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 10:34:05,401 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2018-11-07 10:34:05,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-07 10:34:05,402 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:34:05,402 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:34:05,402 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:34:05,402 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:34:05,403 INFO L82 PathProgramCache]: Analyzing trace with hash -210474340, now seen corresponding path program 8 times [2018-11-07 10:34:05,403 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:34:05,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:05,404 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:34:05,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:05,404 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:34:05,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:34:05,850 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 10:34:05,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:05,851 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:34:05,851 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:34:05,851 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:34:05,851 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:05,851 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:34:05,864 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:34:05,864 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:34:05,941 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 10:34:05,941 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:34:05,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:34:06,201 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-11-07 10:34:06,201 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:34:07,421 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-11-07 10:34:07,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:34:07,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 27] total 45 [2018-11-07 10:34:07,441 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:34:07,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 10:34:07,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 10:34:07,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1740, Unknown=0, NotChecked=0, Total=1980 [2018-11-07 10:34:07,443 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand 20 states. [2018-11-07 10:34:08,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:34:08,115 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2018-11-07 10:34:08,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 10:34:08,116 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2018-11-07 10:34:08,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:34:08,117 INFO L225 Difference]: With dead ends: 58 [2018-11-07 10:34:08,117 INFO L226 Difference]: Without dead ends: 53 [2018-11-07 10:34:08,119 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 100 SyntacticMatches, 18 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=408, Invalid=2348, Unknown=0, NotChecked=0, Total=2756 [2018-11-07 10:34:08,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-11-07 10:34:08,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2018-11-07 10:34:08,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-11-07 10:34:08,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2018-11-07 10:34:08,129 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 67 [2018-11-07 10:34:08,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:34:08,130 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2018-11-07 10:34:08,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 10:34:08,130 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2018-11-07 10:34:08,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2018-11-07 10:34:08,131 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:34:08,131 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:34:08,132 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:34:08,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:34:08,132 INFO L82 PathProgramCache]: Analyzing trace with hash 1156541018, now seen corresponding path program 9 times [2018-11-07 10:34:08,132 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:34:08,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:08,133 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:34:08,133 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:08,134 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:34:08,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:34:08,939 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 10:34:08,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:08,939 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:34:08,939 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:34:08,939 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:34:08,939 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:08,940 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:34:08,948 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:34:08,949 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:34:08,968 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:34:08,968 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:34:08,973 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:34:09,051 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 10:34:09,052 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:34:10,799 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 10:34:10,819 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:34:10,820 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 30] total 50 [2018-11-07 10:34:10,820 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:34:10,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 10:34:10,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 10:34:10,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=2163, Unknown=0, NotChecked=0, Total=2450 [2018-11-07 10:34:10,822 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand 22 states. [2018-11-07 10:34:11,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:34:11,663 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2018-11-07 10:34:11,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 10:34:11,664 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 74 [2018-11-07 10:34:11,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:34:11,665 INFO L225 Difference]: With dead ends: 62 [2018-11-07 10:34:11,665 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 10:34:11,667 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 110 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=494, Invalid=2928, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 10:34:11,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 10:34:11,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2018-11-07 10:34:11,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-11-07 10:34:11,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2018-11-07 10:34:11,673 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 74 [2018-11-07 10:34:11,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:34:11,674 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2018-11-07 10:34:11,674 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 10:34:11,674 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2018-11-07 10:34:11,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2018-11-07 10:34:11,676 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:34:11,676 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:34:11,676 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:34:11,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:34:11,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1694050084, now seen corresponding path program 10 times [2018-11-07 10:34:11,677 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:34:11,677 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:11,678 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:34:11,678 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:11,678 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:34:11,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:34:12,380 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-11-07 10:34:12,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:12,381 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:34:12,381 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:34:12,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:34:12,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:12,381 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:34:12,391 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:34:12,391 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:34:12,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:34:12,420 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:34:12,664 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 200 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2018-11-07 10:34:12,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:34:15,136 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 0 proven. 290 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 10:34:15,156 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:34:15,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 33] total 55 [2018-11-07 10:34:15,157 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:34:15,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 10:34:15,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 10:34:15,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=2632, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 10:34:15,159 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand 24 states. [2018-11-07 10:34:16,086 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-11-07 10:34:16,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:34:16,550 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2018-11-07 10:34:16,550 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-11-07 10:34:16,550 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 81 [2018-11-07 10:34:16,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:34:16,552 INFO L225 Difference]: With dead ends: 66 [2018-11-07 10:34:16,552 INFO L226 Difference]: Without dead ends: 61 [2018-11-07 10:34:16,554 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 120 SyntacticMatches, 22 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=588, Invalid=3572, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 10:34:16,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-11-07 10:34:16,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2018-11-07 10:34:16,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2018-11-07 10:34:16,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 69 transitions. [2018-11-07 10:34:16,562 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 69 transitions. Word has length 81 [2018-11-07 10:34:16,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:34:16,562 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 69 transitions. [2018-11-07 10:34:16,562 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 10:34:16,563 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 69 transitions. [2018-11-07 10:34:16,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2018-11-07 10:34:16,564 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:34:16,564 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:34:16,564 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:34:16,565 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:34:16,565 INFO L82 PathProgramCache]: Analyzing trace with hash 246445082, now seen corresponding path program 11 times [2018-11-07 10:34:16,565 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:34:16,565 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:16,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:34:16,566 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:34:16,566 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:34:16,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:34:17,336 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-11-07 10:34:17,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:17,337 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:34:17,337 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:34:17,337 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:34:17,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:34:17,338 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:34:17,347 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:34:17,347 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:35:21,913 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 10:35:21,914 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:35:22,445 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:35:22,612 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-11-07 10:35:22,612 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:35:26,010 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 352 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-07 10:35:26,032 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:35:26,032 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 36] total 60 [2018-11-07 10:35:26,032 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:35:26,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 10:35:26,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 10:35:26,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=3147, Unknown=0, NotChecked=0, Total=3540 [2018-11-07 10:35:26,035 INFO L87 Difference]: Start difference. First operand 59 states and 69 transitions. Second operand 26 states. [2018-11-07 10:35:27,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:35:27,450 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2018-11-07 10:35:27,450 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 10:35:27,450 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 88 [2018-11-07 10:35:27,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:35:27,452 INFO L225 Difference]: With dead ends: 70 [2018-11-07 10:35:27,452 INFO L226 Difference]: Without dead ends: 65 [2018-11-07 10:35:27,455 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 130 SyntacticMatches, 24 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 440 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=690, Invalid=4280, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 10:35:27,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2018-11-07 10:35:27,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2018-11-07 10:35:27,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-11-07 10:35:27,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 74 transitions. [2018-11-07 10:35:27,463 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 74 transitions. Word has length 88 [2018-11-07 10:35:27,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:35:27,464 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 74 transitions. [2018-11-07 10:35:27,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 10:35:27,464 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 74 transitions. [2018-11-07 10:35:27,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2018-11-07 10:35:27,466 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:35:27,466 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:35:27,467 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:35:27,467 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:35:27,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1503352604, now seen corresponding path program 12 times [2018-11-07 10:35:27,467 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:35:27,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:27,468 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:35:27,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:27,468 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:35:27,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:35:27,979 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-07 10:35:27,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:27,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:35:27,980 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:35:27,980 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:35:27,980 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:27,980 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:35:27,989 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:35:27,989 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:35:28,016 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:35:28,017 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:35:28,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:35:28,097 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-07 10:35:28,098 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:35:30,662 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-11-07 10:35:30,682 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:35:30,682 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 39] total 65 [2018-11-07 10:35:30,682 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:35:30,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-11-07 10:35:30,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-11-07 10:35:30,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=452, Invalid=3708, Unknown=0, NotChecked=0, Total=4160 [2018-11-07 10:35:30,685 INFO L87 Difference]: Start difference. First operand 63 states and 74 transitions. Second operand 28 states. [2018-11-07 10:35:31,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:35:31,755 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2018-11-07 10:35:31,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 10:35:31,755 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 95 [2018-11-07 10:35:31,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:35:31,757 INFO L225 Difference]: With dead ends: 74 [2018-11-07 10:35:31,757 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 10:35:31,760 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 140 SyntacticMatches, 26 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=800, Invalid=5052, Unknown=0, NotChecked=0, Total=5852 [2018-11-07 10:35:31,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 10:35:31,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2018-11-07 10:35:31,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-11-07 10:35:31,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2018-11-07 10:35:31,767 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 95 [2018-11-07 10:35:31,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:35:31,767 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2018-11-07 10:35:31,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-11-07 10:35:31,768 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2018-11-07 10:35:31,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-11-07 10:35:31,769 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:35:31,769 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:35:31,769 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:35:31,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:35:31,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1308454362, now seen corresponding path program 13 times [2018-11-07 10:35:31,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:35:31,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:31,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:35:31,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:31,771 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:35:31,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:35:32,465 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-11-07 10:35:32,465 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:32,465 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:35:32,466 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:35:32,466 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:35:32,466 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:32,466 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:35:32,474 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:35:32,474 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:35:32,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:35:32,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:35:32,625 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 338 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2018-11-07 10:35:32,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:35:35,323 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 0 proven. 494 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-11-07 10:35:35,343 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:35:35,344 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 42] total 70 [2018-11-07 10:35:35,344 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:35:35,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 10:35:35,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 10:35:35,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=515, Invalid=4315, Unknown=0, NotChecked=0, Total=4830 [2018-11-07 10:35:35,346 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 30 states. [2018-11-07 10:35:36,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:35:36,797 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-11-07 10:35:36,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-11-07 10:35:36,800 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 102 [2018-11-07 10:35:36,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:35:36,801 INFO L225 Difference]: With dead ends: 78 [2018-11-07 10:35:36,801 INFO L226 Difference]: Without dead ends: 73 [2018-11-07 10:35:36,804 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 150 SyntacticMatches, 28 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 611 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=918, Invalid=5888, Unknown=0, NotChecked=0, Total=6806 [2018-11-07 10:35:36,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-11-07 10:35:36,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2018-11-07 10:35:36,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2018-11-07 10:35:36,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2018-11-07 10:35:36,811 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 102 [2018-11-07 10:35:36,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:35:36,811 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2018-11-07 10:35:36,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 10:35:36,812 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2018-11-07 10:35:36,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-11-07 10:35:36,812 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:35:36,813 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:35:36,813 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:35:36,814 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:35:36,814 INFO L82 PathProgramCache]: Analyzing trace with hash 2052449628, now seen corresponding path program 14 times [2018-11-07 10:35:36,814 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:35:36,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:36,815 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:35:36,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:36,815 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:35:36,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:35:37,776 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-11-07 10:35:37,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:37,777 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:35:37,777 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:35:37,777 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:35:37,777 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:37,777 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:35:37,786 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:35:37,786 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 10:35:39,351 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2018-11-07 10:35:39,352 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:35:39,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:35:39,458 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 273 trivial. 0 not checked. [2018-11-07 10:35:39,458 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:35:42,904 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 0 proven. 574 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-11-07 10:35:42,926 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:35:42,926 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 45] total 75 [2018-11-07 10:35:42,926 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:35:42,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-11-07 10:35:42,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-11-07 10:35:42,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=4968, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 10:35:42,929 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand 32 states. [2018-11-07 10:35:44,848 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-11-07 10:35:44,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:35:44,972 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2018-11-07 10:35:44,972 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-11-07 10:35:44,972 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 109 [2018-11-07 10:35:44,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:35:44,974 INFO L225 Difference]: With dead ends: 82 [2018-11-07 10:35:44,974 INFO L226 Difference]: Without dead ends: 77 [2018-11-07 10:35:44,975 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 160 SyntacticMatches, 30 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1044, Invalid=6788, Unknown=0, NotChecked=0, Total=7832 [2018-11-07 10:35:44,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2018-11-07 10:35:44,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2018-11-07 10:35:44,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-11-07 10:35:44,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2018-11-07 10:35:44,983 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 109 [2018-11-07 10:35:44,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:35:44,984 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2018-11-07 10:35:44,984 INFO L481 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-11-07 10:35:44,984 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2018-11-07 10:35:44,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-11-07 10:35:44,985 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:35:44,985 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:35:44,985 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:35:44,986 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:35:44,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1489872998, now seen corresponding path program 15 times [2018-11-07 10:35:44,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:35:44,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:44,987 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:35:44,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:44,987 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:35:45,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:35:46,310 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-11-07 10:35:46,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:46,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:35:46,311 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:35:46,311 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:35:46,311 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:46,311 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:35:46,320 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 10:35:46,320 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 10:35:46,357 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 10:35:46,358 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 10:35:46,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:35:46,504 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 450 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-11-07 10:35:46,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:35:50,241 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-11-07 10:35:50,262 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:35:50,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 48] total 80 [2018-11-07 10:35:50,262 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:35:50,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-11-07 10:35:50,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-11-07 10:35:50,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=653, Invalid=5667, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 10:35:50,264 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 34 states. [2018-11-07 10:35:51,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:35:51,939 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2018-11-07 10:35:51,940 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-11-07 10:35:51,940 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 116 [2018-11-07 10:35:51,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:35:51,942 INFO L225 Difference]: With dead ends: 86 [2018-11-07 10:35:51,942 INFO L226 Difference]: Without dead ends: 81 [2018-11-07 10:35:51,943 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 170 SyntacticMatches, 32 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1178, Invalid=7752, Unknown=0, NotChecked=0, Total=8930 [2018-11-07 10:35:51,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-11-07 10:35:51,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2018-11-07 10:35:51,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-11-07 10:35:51,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2018-11-07 10:35:51,949 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 116 [2018-11-07 10:35:51,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:35:51,950 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2018-11-07 10:35:51,950 INFO L481 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-11-07 10:35:51,950 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2018-11-07 10:35:51,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2018-11-07 10:35:51,951 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:35:51,951 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:35:51,952 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:35:51,952 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:35:51,952 INFO L82 PathProgramCache]: Analyzing trace with hash -111508580, now seen corresponding path program 16 times [2018-11-07 10:35:51,952 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:35:51,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:51,953 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 10:35:51,953 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:51,953 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:35:51,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:35:53,060 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-11-07 10:35:53,060 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:53,060 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:35:53,061 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:35:53,061 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:35:53,061 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:35:53,061 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:35:53,069 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:35:53,070 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 10:35:53,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:35:53,113 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 10:35:53,221 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2018-11-07 10:35:53,221 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 10:35:57,619 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 0 proven. 752 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2018-11-07 10:35:57,641 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 10:35:57,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 51] total 85 [2018-11-07 10:35:57,641 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 10:35:57,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 10:35:57,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 10:35:57,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=728, Invalid=6412, Unknown=0, NotChecked=0, Total=7140 [2018-11-07 10:35:57,643 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand 36 states. [2018-11-07 10:35:59,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 10:35:59,408 INFO L93 Difference]: Finished difference Result 90 states and 107 transitions. [2018-11-07 10:35:59,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-11-07 10:35:59,409 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 123 [2018-11-07 10:35:59,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 10:35:59,411 INFO L225 Difference]: With dead ends: 90 [2018-11-07 10:35:59,411 INFO L226 Difference]: Without dead ends: 85 [2018-11-07 10:35:59,413 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 180 SyntacticMatches, 34 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 920 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=1320, Invalid=8780, Unknown=0, NotChecked=0, Total=10100 [2018-11-07 10:35:59,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-11-07 10:35:59,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2018-11-07 10:35:59,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2018-11-07 10:35:59,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2018-11-07 10:35:59,419 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 123 [2018-11-07 10:35:59,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 10:35:59,420 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2018-11-07 10:35:59,420 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 10:35:59,420 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2018-11-07 10:35:59,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2018-11-07 10:35:59,421 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 10:35:59,421 INFO L375 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 10:35:59,421 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 10:35:59,421 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 10:35:59,422 INFO L82 PathProgramCache]: Analyzing trace with hash -307547814, now seen corresponding path program 17 times [2018-11-07 10:35:59,422 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 10:35:59,422 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:59,422 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 10:35:59,423 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 10:35:59,423 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 10:35:59,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 10:36:00,924 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 0 proven. 578 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2018-11-07 10:36:00,924 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:36:00,924 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 10:36:00,925 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 10:36:00,925 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 10:36:00,925 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 10:36:00,925 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 10:36:00,934 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 10:36:00,934 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