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 --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf -i ../../../trunk/examples/svcomp/loop-acceleration/overflow_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-69f5bdd-m [2018-09-18 09:56:45,352 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-18 09:56:45,354 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-18 09:56:45,367 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-18 09:56:45,367 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-18 09:56:45,368 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-18 09:56:45,369 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-18 09:56:45,371 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-18 09:56:45,372 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-18 09:56:45,373 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-18 09:56:45,374 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-18 09:56:45,375 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-18 09:56:45,375 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-18 09:56:45,376 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-18 09:56:45,378 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-18 09:56:45,379 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-18 09:56:45,379 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-18 09:56:45,381 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-18 09:56:45,383 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-18 09:56:45,385 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-18 09:56:45,386 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-18 09:56:45,387 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-18 09:56:45,390 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-18 09:56:45,390 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-18 09:56:45,390 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-18 09:56:45,391 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-18 09:56:45,392 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-18 09:56:45,393 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-18 09:56:45,394 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-18 09:56:45,398 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-18 09:56:45,399 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-18 09:56:45,400 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-18 09:56:45,400 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-18 09:56:45,400 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-18 09:56:45,403 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-18 09:56:45,405 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-18 09:56:45,406 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf [2018-09-18 09:56:45,440 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-18 09:56:45,441 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-18 09:56:45,442 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-18 09:56:45,442 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-18 09:56:45,442 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-18 09:56:45,443 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-18 09:56:45,443 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-18 09:56:45,444 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-09-18 09:56:45,444 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-18 09:56:45,444 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-18 09:56:45,444 INFO L133 SettingsManager]: * Parallel states before merging=1 [2018-09-18 09:56:45,445 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-18 09:56:45,446 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-18 09:56:45,446 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-18 09:56:45,447 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-18 09:56:45,447 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-18 09:56:45,447 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-18 09:56:45,447 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-18 09:56:45,449 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-18 09:56:45,450 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-18 09:56:45,450 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-18 09:56:45,450 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-18 09:56:45,450 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-18 09:56:45,451 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-18 09:56:45,451 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-18 09:56:45,451 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-18 09:56:45,451 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-18 09:56:45,452 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-18 09:56:45,452 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-09-18 09:56:45,452 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-18 09:56:45,452 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-18 09:56:45,452 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-18 09:56:45,452 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-18 09:56:45,453 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-18 09:56:45,515 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-18 09:56:45,531 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-18 09:56:45,537 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-18 09:56:45,539 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-18 09:56:45,539 INFO L276 PluginConnector]: CDTParser initialized [2018-09-18 09:56:45,540 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/overflow_true-unreach-call1.i [2018-09-18 09:56:45,883 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efa8c7a1d/9ca71da5819844f4ad4f9611885b7a71/FLAG4631705bd [2018-09-18 09:56:46,060 INFO L277 CDTParser]: Found 1 translation units. [2018-09-18 09:56:46,061 INFO L159 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/overflow_true-unreach-call1.i [2018-09-18 09:56:46,069 INFO L325 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efa8c7a1d/9ca71da5819844f4ad4f9611885b7a71/FLAG4631705bd [2018-09-18 09:56:46,090 INFO L333 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/efa8c7a1d/9ca71da5819844f4ad4f9611885b7a71 [2018-09-18 09:56:46,101 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-18 09:56:46,103 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-18 09:56:46,105 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-18 09:56:46,105 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-18 09:56:46,114 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-18 09:56:46,115 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,121 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3665023a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46, skipping insertion in model container [2018-09-18 09:56:46,121 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,135 INFO L160 ieTranslatorObserver]: Starting translation in SV-COMP mode [2018-09-18 09:56:46,365 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-18 09:56:46,388 INFO L424 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-18 09:56:46,393 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-18 09:56:46,409 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46 WrapperNode [2018-09-18 09:56:46,410 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-18 09:56:46,411 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-18 09:56:46,411 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-18 09:56:46,411 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-18 09:56:46,422 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,429 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,436 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-18 09:56:46,436 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-18 09:56:46,436 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-18 09:56:46,436 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-18 09:56:46,448 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,448 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,449 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,449 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,451 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,459 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,460 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (1/1) ... [2018-09-18 09:56:46,462 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-18 09:56:46,467 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-18 09:56:46,467 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-18 09:56:46,467 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-18 09:56:46,470 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (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 [2018-09-18 09:56:46,541 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-18 09:56:46,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-18 09:56:46,542 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-18 09:56:46,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-18 09:56:46,542 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-18 09:56:46,542 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-18 09:56:46,542 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-09-18 09:56:46,543 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-09-18 09:56:46,850 INFO L356 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-18 09:56:46,851 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.09 09:56:46 BoogieIcfgContainer [2018-09-18 09:56:46,851 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-18 09:56:46,852 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-18 09:56:46,852 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-18 09:56:46,856 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-18 09:56:46,856 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.09 09:56:46" (1/3) ... [2018-09-18 09:56:46,857 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a3d9841 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.09 09:56:46, skipping insertion in model container [2018-09-18 09:56:46,857 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.09 09:56:46" (2/3) ... [2018-09-18 09:56:46,858 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a3d9841 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.09 09:56:46, skipping insertion in model container [2018-09-18 09:56:46,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.09 09:56:46" (3/3) ... [2018-09-18 09:56:46,860 INFO L112 eAbstractionObserver]: Analyzing ICFG overflow_true-unreach-call1.i [2018-09-18 09:56:46,869 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-18 09:56:46,876 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-18 09:56:46,925 INFO L130 ementStrategyFactory]: Using default assertion order modulation [2018-09-18 09:56:46,926 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-18 09:56:46,926 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-18 09:56:46,927 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-18 09:56:46,927 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-18 09:56:46,927 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-18 09:56:46,927 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-18 09:56:46,927 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-18 09:56:46,927 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-18 09:56:46,947 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-09-18 09:56:46,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-18 09:56:46,954 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:46,955 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:46,956 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:46,962 INFO L82 PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times [2018-09-18 09:56:46,965 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:47,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:47,024 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:47,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:47,024 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:47,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:47,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:47,091 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-18 09:56:47,091 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-18 09:56:47,092 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:56:47,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-09-18 09:56:47,113 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-09-18 09:56:47,114 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-18 09:56:47,116 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-09-18 09:56:47,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:47,141 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-09-18 09:56:47,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-09-18 09:56:47,143 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-09-18 09:56:47,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:47,153 INFO L225 Difference]: With dead ends: 29 [2018-09-18 09:56:47,153 INFO L226 Difference]: Without dead ends: 12 [2018-09-18 09:56:47,157 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 [2018-09-18 09:56:47,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-09-18 09:56:47,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-09-18 09:56:47,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-09-18 09:56:47,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-09-18 09:56:47,199 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-09-18 09:56:47,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:47,200 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-09-18 09:56:47,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-09-18 09:56:47,200 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-09-18 09:56:47,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-18 09:56:47,201 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:47,201 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:47,202 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:47,202 INFO L82 PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times [2018-09-18 09:56:47,202 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:47,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:47,204 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:47,204 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:47,204 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:47,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:47,363 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:47,363 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-18 09:56:47,364 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-18 09:56:47,364 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-18 09:56:47,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-18 09:56:47,366 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-18 09:56:47,367 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-18 09:56:47,367 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-09-18 09:56:47,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:47,417 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-18 09:56:47,419 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-18 09:56:47,419 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-09-18 09:56:47,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:47,421 INFO L225 Difference]: With dead ends: 19 [2018-09-18 09:56:47,421 INFO L226 Difference]: Without dead ends: 14 [2018-09-18 09:56:47,422 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-18 09:56:47,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-09-18 09:56:47,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-09-18 09:56:47,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-09-18 09:56:47,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-09-18 09:56:47,437 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-09-18 09:56:47,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:47,437 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-09-18 09:56:47,438 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-18 09:56:47,438 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-09-18 09:56:47,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-18 09:56:47,439 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:47,439 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:47,439 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:47,440 INFO L82 PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times [2018-09-18 09:56:47,440 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:47,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:47,441 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:47,445 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:47,446 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:47,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:47,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:47,604 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:47,604 INFO L197 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 [2018-09-18 09:56:47,619 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:47,620 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:56:47,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:47,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:47,701 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:47,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:47,826 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:47,848 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:47,849 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:47,872 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:47,873 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:56:47,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:47,891 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:47,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:47,911 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:47,929 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:47,929 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-09-18 09:56:47,929 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:47,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-18 09:56:47,930 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-18 09:56:47,930 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:47,931 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-09-18 09:56:48,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:48,012 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-18 09:56:48,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-18 09:56:48,013 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-09-18 09:56:48,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:48,014 INFO L225 Difference]: With dead ends: 21 [2018-09-18 09:56:48,014 INFO L226 Difference]: Without dead ends: 16 [2018-09-18 09:56:48,014 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-18 09:56:48,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-18 09:56:48,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-09-18 09:56:48,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-09-18 09:56:48,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-09-18 09:56:48,019 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-09-18 09:56:48,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:48,019 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-09-18 09:56:48,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-18 09:56:48,020 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-09-18 09:56:48,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-09-18 09:56:48,021 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:48,021 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:48,021 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:48,021 INFO L82 PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times [2018-09-18 09:56:48,022 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:48,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:48,023 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:56:48,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:48,023 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:48,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:48,202 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:48,202 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:48,202 INFO L197 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 [2018-09-18 09:56:48,222 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:56:48,222 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:48,240 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:56:48,241 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:48,246 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:48,322 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:48,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:48,494 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:48,515 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:48,515 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:48,531 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:56:48,532 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:48,551 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:56:48,552 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:48,555 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:48,576 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:48,576 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:48,613 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:48,618 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:48,619 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-09-18 09:56:48,619 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:48,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-18 09:56:48,620 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-18 09:56:48,620 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-18 09:56:48,621 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-09-18 09:56:48,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:48,670 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-18 09:56:48,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-18 09:56:48,671 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-09-18 09:56:48,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:48,672 INFO L225 Difference]: With dead ends: 23 [2018-09-18 09:56:48,672 INFO L226 Difference]: Without dead ends: 18 [2018-09-18 09:56:48,673 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-18 09:56:48,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-09-18 09:56:48,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-09-18 09:56:48,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-18 09:56:48,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-09-18 09:56:48,682 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-09-18 09:56:48,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:48,682 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-09-18 09:56:48,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-18 09:56:48,683 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-09-18 09:56:48,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-18 09:56:48,683 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:48,684 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:48,684 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:48,685 INFO L82 PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times [2018-09-18 09:56:48,685 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:48,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:48,687 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:56:48,687 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:48,687 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:48,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:48,821 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:48,822 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:48,822 INFO L197 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 [2018-09-18 09:56:48,838 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:56:48,838 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:56:48,903 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-18 09:56:48,904 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:48,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:48,981 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:48,982 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:49,099 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:49,120 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:49,120 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:49,137 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:56:49,137 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:56:49,174 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-18 09:56:49,174 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:49,177 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:49,188 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:49,189 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:49,214 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:49,218 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:49,219 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-09-18 09:56:49,219 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:49,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-18 09:56:49,220 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-18 09:56:49,221 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-18 09:56:49,221 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-09-18 09:56:49,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:49,280 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-18 09:56:49,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-18 09:56:49,281 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-09-18 09:56:49,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:49,282 INFO L225 Difference]: With dead ends: 25 [2018-09-18 09:56:49,282 INFO L226 Difference]: Without dead ends: 20 [2018-09-18 09:56:49,283 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-18 09:56:49,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-09-18 09:56:49,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-09-18 09:56:49,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-09-18 09:56:49,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-09-18 09:56:49,288 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-09-18 09:56:49,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:49,288 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-09-18 09:56:49,288 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-18 09:56:49,289 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-09-18 09:56:49,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-09-18 09:56:49,289 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:49,290 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:49,290 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:49,290 INFO L82 PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times [2018-09-18 09:56:49,290 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:49,291 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:49,291 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:56:49,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:49,292 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:49,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:49,525 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:49,525 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:49,525 INFO L197 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 [2018-09-18 09:56:49,542 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:56:49,543 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:56:49,578 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:56:49,578 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:49,580 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:49,633 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:49,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:49,945 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:49,967 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:49,967 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:49,984 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:56:49,984 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:56:50,006 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:56:50,006 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:50,011 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:50,037 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:50,037 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:50,050 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:50,053 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:50,053 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-09-18 09:56:50,053 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:50,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-18 09:56:50,055 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-18 09:56:50,055 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-18 09:56:50,056 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-09-18 09:56:50,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:50,142 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-18 09:56:50,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-18 09:56:50,143 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-09-18 09:56:50,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:50,145 INFO L225 Difference]: With dead ends: 27 [2018-09-18 09:56:50,145 INFO L226 Difference]: Without dead ends: 22 [2018-09-18 09:56:50,146 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-18 09:56:50,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-09-18 09:56:50,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-09-18 09:56:50,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-18 09:56:50,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-09-18 09:56:50,151 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-09-18 09:56:50,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:50,151 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-09-18 09:56:50,151 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-18 09:56:50,151 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-09-18 09:56:50,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-18 09:56:50,152 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:50,152 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:50,153 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:50,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times [2018-09-18 09:56:50,153 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:50,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:50,154 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:56:50,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:50,154 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:50,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:50,333 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:50,334 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:50,334 INFO L197 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 [2018-09-18 09:56:50,342 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:56:50,343 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:50,362 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-18 09:56:50,363 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:50,365 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:50,384 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:50,384 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:50,661 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:50,682 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:50,683 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:56:50,699 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:56:50,699 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:56:50,740 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-18 09:56:50,740 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:56:50,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:56:50,776 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:50,776 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:56:50,791 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:50,793 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:56:50,793 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-09-18 09:56:50,793 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:56:50,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-18 09:56:50,794 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-18 09:56:50,795 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-18 09:56:50,795 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-09-18 09:56:50,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:56:50,898 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-18 09:56:50,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-18 09:56:50,901 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-09-18 09:56:50,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:56:50,902 INFO L225 Difference]: With dead ends: 29 [2018-09-18 09:56:50,902 INFO L226 Difference]: Without dead ends: 24 [2018-09-18 09:56:50,903 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-18 09:56:50,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-18 09:56:50,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-18 09:56:50,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-18 09:56:50,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-18 09:56:50,908 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-09-18 09:56:50,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:56:50,908 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-18 09:56:50,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-18 09:56:50,908 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-18 09:56:50,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-18 09:56:50,909 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:56:50,909 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:56:50,909 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:56:50,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times [2018-09-18 09:56:50,910 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:56:50,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:50,911 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:56:50,911 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:56:50,911 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:56:50,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:56:51,121 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:56:51,121 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:56:51,121 INFO L197 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 [2018-09-18 09:56:51,138 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:56:51,138 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:57:03,175 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-18 09:57:03,176 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:03,178 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:03,206 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:03,206 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:03,381 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:03,405 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:03,405 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:03,422 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:57:03,422 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:57:03,495 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-18 09:57:03,495 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:03,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:03,515 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:03,515 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:03,528 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:03,529 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:03,530 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-09-18 09:57:03,530 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:03,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-18 09:57:03,531 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-18 09:57:03,531 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-18 09:57:03,531 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-09-18 09:57:03,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:03,614 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-18 09:57:03,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-18 09:57:03,615 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-09-18 09:57:03,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:03,616 INFO L225 Difference]: With dead ends: 31 [2018-09-18 09:57:03,616 INFO L226 Difference]: Without dead ends: 26 [2018-09-18 09:57:03,617 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-18 09:57:03,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-18 09:57:03,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-18 09:57:03,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-18 09:57:03,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-09-18 09:57:03,622 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-09-18 09:57:03,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:03,623 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-09-18 09:57:03,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-18 09:57:03,623 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-09-18 09:57:03,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-18 09:57:03,624 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:03,624 INFO L376 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:03,624 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:03,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1082171650, now seen corresponding path program 7 times [2018-09-18 09:57:03,625 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:03,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:03,626 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:03,626 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:03,626 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:03,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:03,817 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:03,817 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:03,818 INFO L197 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 [2018-09-18 09:57:03,827 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:57:03,827 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:57:03,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:03,841 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:03,875 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:03,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:04,212 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:04,234 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:04,234 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:04,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:57:04,252 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:57:04,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:04,281 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:04,317 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:04,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:04,334 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:04,336 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:04,336 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-09-18 09:57:04,337 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:04,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-18 09:57:04,338 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-18 09:57:04,338 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-18 09:57:04,338 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-09-18 09:57:04,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:04,438 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-18 09:57:04,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-18 09:57:04,448 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-09-18 09:57:04,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:04,449 INFO L225 Difference]: With dead ends: 33 [2018-09-18 09:57:04,449 INFO L226 Difference]: Without dead ends: 28 [2018-09-18 09:57:04,450 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-18 09:57:04,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-18 09:57:04,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-09-18 09:57:04,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-09-18 09:57:04,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-09-18 09:57:04,455 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-09-18 09:57:04,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:04,455 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-09-18 09:57:04,456 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-18 09:57:04,456 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-09-18 09:57:04,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-09-18 09:57:04,457 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:04,457 INFO L376 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:04,457 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:04,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1579855560, now seen corresponding path program 8 times [2018-09-18 09:57:04,457 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:04,458 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:04,459 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:57:04,459 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:04,459 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:04,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:04,686 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:04,686 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:04,687 INFO L197 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 [2018-09-18 09:57:04,694 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:57:04,695 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:57:04,707 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:57:04,708 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:04,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:04,734 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:04,734 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:04,992 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:05,013 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:05,013 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:05,031 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:57:05,031 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:57:05,057 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:57:05,057 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:05,061 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:05,128 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:05,128 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:05,187 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:05,194 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:05,195 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-09-18 09:57:05,195 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:05,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-18 09:57:05,196 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-18 09:57:05,196 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-18 09:57:05,197 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-09-18 09:57:05,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:05,663 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-18 09:57:05,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-18 09:57:05,664 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-09-18 09:57:05,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:05,665 INFO L225 Difference]: With dead ends: 35 [2018-09-18 09:57:05,665 INFO L226 Difference]: Without dead ends: 30 [2018-09-18 09:57:05,666 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-18 09:57:05,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-18 09:57:05,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-09-18 09:57:05,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-18 09:57:05,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-18 09:57:05,672 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-09-18 09:57:05,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:05,672 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-18 09:57:05,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-18 09:57:05,673 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-18 09:57:05,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-18 09:57:05,674 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:05,674 INFO L376 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:05,674 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:05,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1182244082, now seen corresponding path program 9 times [2018-09-18 09:57:05,675 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:05,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:05,676 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:05,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:05,676 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:05,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:05,923 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:05,924 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:05,924 INFO L197 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 [2018-09-18 09:57:05,931 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:57:05,932 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:57:05,981 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-18 09:57:05,981 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:05,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:05,999 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:05,999 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:06,415 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:06,436 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:06,437 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:06,452 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:57:06,452 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:57:06,567 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-18 09:57:06,568 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:06,571 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:06,581 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:06,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:06,595 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:06,597 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:06,597 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-09-18 09:57:06,597 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:06,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-18 09:57:06,598 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-18 09:57:06,598 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-18 09:57:06,598 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-09-18 09:57:06,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:06,820 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-18 09:57:06,823 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-18 09:57:06,823 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-09-18 09:57:06,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:06,825 INFO L225 Difference]: With dead ends: 37 [2018-09-18 09:57:06,825 INFO L226 Difference]: Without dead ends: 32 [2018-09-18 09:57:06,826 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-18 09:57:06,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-09-18 09:57:06,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-09-18 09:57:06,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-18 09:57:06,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-09-18 09:57:06,832 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-09-18 09:57:06,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:06,833 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-09-18 09:57:06,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-18 09:57:06,833 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-09-18 09:57:06,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-09-18 09:57:06,834 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:06,834 INFO L376 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:06,834 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:06,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1270211116, now seen corresponding path program 10 times [2018-09-18 09:57:06,835 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:06,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:06,836 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:06,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:06,836 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:06,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:07,260 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:07,261 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:07,261 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:07,272 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:57:07,272 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:57:07,283 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:57:07,284 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:07,286 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:07,316 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:07,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:07,698 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:07,720 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:07,721 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:07,756 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:57:07,756 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:57:07,784 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:57:07,784 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:07,788 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:07,824 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:07,825 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:07,860 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:07,861 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:07,862 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-09-18 09:57:07,862 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:07,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-18 09:57:07,862 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-18 09:57:07,863 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-18 09:57:07,863 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-09-18 09:57:08,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:08,004 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-18 09:57:08,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-18 09:57:08,004 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-09-18 09:57:08,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:08,005 INFO L225 Difference]: With dead ends: 39 [2018-09-18 09:57:08,006 INFO L226 Difference]: Without dead ends: 34 [2018-09-18 09:57:08,007 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-18 09:57:08,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-09-18 09:57:08,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-09-18 09:57:08,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-09-18 09:57:08,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-09-18 09:57:08,011 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-09-18 09:57:08,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:08,012 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-09-18 09:57:08,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-18 09:57:08,012 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-09-18 09:57:08,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-09-18 09:57:08,013 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:08,013 INFO L376 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:08,013 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:08,014 INFO L82 PathProgramCache]: Analyzing trace with hash 92815130, now seen corresponding path program 11 times [2018-09-18 09:57:08,014 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:08,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:08,015 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:08,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:08,015 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:08,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:08,256 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:08,256 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:08,256 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:08,264 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:57:08,264 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:57:49,131 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-18 09:57:49,132 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:49,195 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:49,210 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:49,210 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:49,681 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:49,703 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:49,703 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:57:49,718 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:57:49,719 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:57:49,850 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-18 09:57:49,851 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:57:49,854 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:57:49,869 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:49,869 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:57:49,914 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:49,915 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:57:49,915 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-09-18 09:57:49,916 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:57:49,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-18 09:57:49,916 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-18 09:57:49,917 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-18 09:57:49,917 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-09-18 09:57:50,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:57:50,113 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-18 09:57:50,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-18 09:57:50,118 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-09-18 09:57:50,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:57:50,119 INFO L225 Difference]: With dead ends: 41 [2018-09-18 09:57:50,119 INFO L226 Difference]: Without dead ends: 36 [2018-09-18 09:57:50,120 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-18 09:57:50,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-09-18 09:57:50,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-09-18 09:57:50,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-09-18 09:57:50,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-09-18 09:57:50,125 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-09-18 09:57:50,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:57:50,125 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-09-18 09:57:50,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-18 09:57:50,125 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-09-18 09:57:50,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-09-18 09:57:50,126 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:57:50,126 INFO L376 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:57:50,127 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:57:50,127 INFO L82 PathProgramCache]: Analyzing trace with hash -3987744, now seen corresponding path program 12 times [2018-09-18 09:57:50,127 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:57:50,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:50,128 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:57:50,128 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:57:50,128 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:57:50,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:57:50,523 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:57:50,524 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:57:50,524 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:57:50,531 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:57:50,531 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:58:22,632 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-18 09:58:22,632 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:22,637 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:22,671 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:22,671 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:23,127 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:23,151 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:23,151 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:23,168 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-18 09:58:23,168 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-18 09:58:23,361 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-18 09:58:23,362 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:23,366 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:23,398 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:23,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:23,454 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:23,456 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:23,456 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-09-18 09:58:23,456 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:23,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-18 09:58:23,457 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-18 09:58:23,457 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-18 09:58:23,457 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-09-18 09:58:23,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:23,659 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-18 09:58:23,660 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-18 09:58:23,660 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-09-18 09:58:23,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:23,661 INFO L225 Difference]: With dead ends: 43 [2018-09-18 09:58:23,661 INFO L226 Difference]: Without dead ends: 38 [2018-09-18 09:58:23,662 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 125 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-18 09:58:23,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-09-18 09:58:23,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-09-18 09:58:23,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-09-18 09:58:23,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-09-18 09:58:23,668 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-09-18 09:58:23,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:23,669 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-09-18 09:58:23,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-18 09:58:23,669 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-09-18 09:58:23,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-09-18 09:58:23,670 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:23,670 INFO L376 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:23,670 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:23,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1457730854, now seen corresponding path program 13 times [2018-09-18 09:58:23,670 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:23,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:23,671 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:58:23,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:23,672 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:23,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:24,024 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:24,025 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:24,025 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:24,033 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:58:24,033 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:58:24,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:24,047 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:24,061 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:24,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:24,603 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:24,623 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:24,624 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:24,641 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:58:24,641 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-18 09:58:24,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:24,674 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:24,699 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:24,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:24,747 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:24,752 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:24,752 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-09-18 09:58:24,752 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:24,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-18 09:58:24,753 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-18 09:58:24,753 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-18 09:58:24,754 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-09-18 09:58:25,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:25,009 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-18 09:58:25,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-18 09:58:25,010 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-09-18 09:58:25,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:25,011 INFO L225 Difference]: With dead ends: 45 [2018-09-18 09:58:25,011 INFO L226 Difference]: Without dead ends: 40 [2018-09-18 09:58:25,012 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-18 09:58:25,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-09-18 09:58:25,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-09-18 09:58:25,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-09-18 09:58:25,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-09-18 09:58:25,017 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-09-18 09:58:25,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:25,018 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-09-18 09:58:25,018 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-18 09:58:25,018 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-09-18 09:58:25,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-09-18 09:58:25,019 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:25,019 INFO L376 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:25,019 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:25,019 INFO L82 PathProgramCache]: Analyzing trace with hash 1714997740, now seen corresponding path program 14 times [2018-09-18 09:58:25,019 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:25,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:25,020 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-18 09:58:25,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:25,021 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:25,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:25,577 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:25,578 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:25,578 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:25,587 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:58:25,588 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:58:25,601 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:58:25,602 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:25,604 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:25,630 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:25,631 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:26,241 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:26,262 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:26,262 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:58:26,280 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-18 09:58:26,280 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-18 09:58:26,310 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-18 09:58:26,311 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:58:26,314 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:58:26,348 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:26,348 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:58:26,356 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:26,358 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:58:26,358 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-09-18 09:58:26,358 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:58:26,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-18 09:58:26,359 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-18 09:58:26,359 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-09-18 09:58:26,360 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-09-18 09:58:26,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:58:26,557 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-18 09:58:26,558 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-18 09:58:26,558 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-09-18 09:58:26,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:58:26,559 INFO L225 Difference]: With dead ends: 47 [2018-09-18 09:58:26,559 INFO L226 Difference]: Without dead ends: 42 [2018-09-18 09:58:26,560 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-09-18 09:58:26,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-09-18 09:58:26,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-09-18 09:58:26,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-18 09:58:26,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-09-18 09:58:26,566 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-09-18 09:58:26,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:58:26,566 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-09-18 09:58:26,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-18 09:58:26,567 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-09-18 09:58:26,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-09-18 09:58:26,567 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:58:26,567 INFO L376 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:58:26,568 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:58:26,568 INFO L82 PathProgramCache]: Analyzing trace with hash -159627982, now seen corresponding path program 15 times [2018-09-18 09:58:26,568 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:58:26,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:26,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:58:26,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:58:26,569 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:58:26,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:58:27,010 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:58:27,011 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:58:27,011 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:58:27,022 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:58:27,022 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:59:35,326 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-18 09:59:35,327 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:35,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:35,437 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:35,437 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:36,059 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:36,080 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:36,081 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:59:36,097 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-18 09:59:36,097 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-18 09:59:36,367 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-18 09:59:36,367 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:36,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:36,390 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:36,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:36,405 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:36,407 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:36,407 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-09-18 09:59:36,407 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:36,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-18 09:59:36,408 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-18 09:59:36,409 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-09-18 09:59:36,409 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-09-18 09:59:36,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:36,674 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-18 09:59:36,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-18 09:59:36,675 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-09-18 09:59:36,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:36,676 INFO L225 Difference]: With dead ends: 49 [2018-09-18 09:59:36,676 INFO L226 Difference]: Without dead ends: 44 [2018-09-18 09:59:36,677 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 146 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-09-18 09:59:36,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-09-18 09:59:36,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-09-18 09:59:36,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-09-18 09:59:36,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-09-18 09:59:36,683 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-09-18 09:59:36,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:36,683 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-09-18 09:59:36,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-18 09:59:36,684 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-09-18 09:59:36,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-09-18 09:59:36,684 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:36,684 INFO L376 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:36,685 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:36,685 INFO L82 PathProgramCache]: Analyzing trace with hash -2083649800, now seen corresponding path program 16 times [2018-09-18 09:59:36,685 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:36,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:36,686 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:36,686 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:36,686 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:36,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:37,011 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:37,011 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:37,011 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:59:37,021 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:59:37,021 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:59:37,035 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:59:37,036 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:37,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:37,060 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:37,061 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:37,835 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:37,855 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:37,855 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-18 09:59:37,871 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-18 09:59:37,871 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-18 09:59:37,903 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-18 09:59:37,903 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-18 09:59:37,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-18 09:59:37,932 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:37,932 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-18 09:59:37,945 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:37,947 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-18 09:59:37,948 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-09-18 09:59:37,948 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-18 09:59:37,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-18 09:59:37,949 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-18 09:59:37,949 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-18 09:59:37,949 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-09-18 09:59:38,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-18 09:59:38,257 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-18 09:59:38,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-18 09:59:38,257 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-09-18 09:59:38,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-18 09:59:38,258 INFO L225 Difference]: With dead ends: 51 [2018-09-18 09:59:38,258 INFO L226 Difference]: Without dead ends: 46 [2018-09-18 09:59:38,260 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 153 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-18 09:59:38,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-09-18 09:59:38,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-09-18 09:59:38,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-09-18 09:59:38,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-09-18 09:59:38,266 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-09-18 09:59:38,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-18 09:59:38,266 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-09-18 09:59:38,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-18 09:59:38,267 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-09-18 09:59:38,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-09-18 09:59:38,267 INFO L368 BasicCegarLoop]: Found error trace [2018-09-18 09:59:38,267 INFO L376 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-18 09:59:38,268 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-18 09:59:38,268 INFO L82 PathProgramCache]: Analyzing trace with hash 62287678, now seen corresponding path program 17 times [2018-09-18 09:59:38,268 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-18 09:59:38,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:38,269 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-18 09:59:38,269 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-18 09:59:38,269 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-18 09:59:38,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-18 09:59:38,570 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-18 09:59:38,570 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-18 09:59:38,570 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-18 09:59:38,577 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-18 09:59:38,577 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown