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-crafted/simple_array_index_value_true-unreach-call2_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-dace188-m [2018-09-14 15:50:26,724 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-14 15:50:26,727 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-14 15:50:26,742 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-14 15:50:26,742 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-14 15:50:26,743 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-14 15:50:26,745 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-14 15:50:26,754 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-14 15:50:26,756 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-14 15:50:26,756 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-14 15:50:26,757 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-14 15:50:26,758 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-14 15:50:26,759 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-14 15:50:26,760 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-14 15:50:26,761 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-14 15:50:26,762 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-14 15:50:26,763 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-14 15:50:26,764 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-14 15:50:26,766 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-14 15:50:26,768 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-14 15:50:26,769 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-14 15:50:26,770 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-14 15:50:26,773 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-14 15:50:26,773 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-14 15:50:26,773 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-14 15:50:26,774 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-14 15:50:26,775 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-14 15:50:26,776 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-14 15:50:26,777 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-14 15:50:26,778 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-14 15:50:26,778 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-14 15:50:26,779 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-14 15:50:26,779 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-14 15:50:26,780 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-14 15:50:26,781 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-14 15:50:26,781 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-14 15:50:26,782 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 [2018-09-14 15:50:26,797 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-14 15:50:26,798 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-14 15:50:26,799 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-14 15:50:26,799 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-14 15:50:26,799 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-14 15:50:26,799 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-14 15:50:26,799 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-14 15:50:26,800 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-09-14 15:50:26,800 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-14 15:50:26,800 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-14 15:50:26,800 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-14 15:50:26,801 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-14 15:50:26,801 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-14 15:50:26,801 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-14 15:50:26,802 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-14 15:50:26,802 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-14 15:50:26,802 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-14 15:50:26,802 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-14 15:50:26,802 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-14 15:50:26,803 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-14 15:50:26,803 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-14 15:50:26,803 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-14 15:50:26,803 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-14 15:50:26,803 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-14 15:50:26,804 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-14 15:50:26,804 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-14 15:50:26,804 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-14 15:50:26,804 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-09-14 15:50:26,804 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-14 15:50:26,805 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-14 15:50:26,805 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-14 15:50:26,805 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-14 15:50:26,805 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-14 15:50:26,848 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-14 15:50:26,869 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-14 15:50:26,876 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-14 15:50:26,877 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-14 15:50:26,877 INFO L276 PluginConnector]: CDTParser initialized [2018-09-14 15:50:26,878 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call2_true-termination.i [2018-09-14 15:50:27,228 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea96a47f5/db7874eda72f4f7584ebb989ae1730d2/FLAG167edb09a [2018-09-14 15:50:27,400 INFO L277 CDTParser]: Found 1 translation units. [2018-09-14 15:50:27,401 INFO L159 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_true-unreach-call2_true-termination.i [2018-09-14 15:50:27,407 INFO L325 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea96a47f5/db7874eda72f4f7584ebb989ae1730d2/FLAG167edb09a [2018-09-14 15:50:27,424 INFO L333 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ea96a47f5/db7874eda72f4f7584ebb989ae1730d2 [2018-09-14 15:50:27,439 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-14 15:50:27,445 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-14 15:50:27,447 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-14 15:50:27,447 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-14 15:50:27,458 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-14 15:50:27,459 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,462 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@489bfad9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27, skipping insertion in model container [2018-09-14 15:50:27,463 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,476 INFO L160 ieTranslatorObserver]: Starting translation in SV-COMP mode [2018-09-14 15:50:27,678 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-14 15:50:27,696 INFO L424 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-14 15:50:27,704 INFO L170 PostProcessor]: Settings: Checked method=main [2018-09-14 15:50:27,720 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27 WrapperNode [2018-09-14 15:50:27,720 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-14 15:50:27,721 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-14 15:50:27,721 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-14 15:50:27,721 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-14 15:50:27,731 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,738 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,744 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-14 15:50:27,745 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-14 15:50:27,745 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-14 15:50:27,745 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-14 15:50:27,759 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,760 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,760 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,761 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,763 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,772 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,773 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (1/1) ... [2018-09-14 15:50:27,774 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-14 15:50:27,774 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-14 15:50:27,775 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-14 15:50:27,775 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-14 15:50:27,776 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (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 [2018-09-14 15:50:27,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-14 15:50:27,832 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-14 15:50:27,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-14 15:50:27,832 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-14 15:50:27,833 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-14 15:50:27,833 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-14 15:50:27,833 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-09-14 15:50:27,833 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-09-14 15:50:28,161 INFO L353 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-14 15:50:28,167 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.09 03:50:28 BoogieIcfgContainer [2018-09-14 15:50:28,167 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-14 15:50:28,168 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-14 15:50:28,168 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-14 15:50:28,178 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-14 15:50:28,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.09 03:50:27" (1/3) ... [2018-09-14 15:50:28,179 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28b40131 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.09 03:50:28, skipping insertion in model container [2018-09-14 15:50:28,180 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.09 03:50:27" (2/3) ... [2018-09-14 15:50:28,180 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28b40131 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.09 03:50:28, skipping insertion in model container [2018-09-14 15:50:28,180 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.09 03:50:28" (3/3) ... [2018-09-14 15:50:28,184 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_true-unreach-call2_true-termination.i [2018-09-14 15:50:28,209 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-14 15:50:28,222 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-14 15:50:28,269 INFO L130 ementStrategyFactory]: Using default assertion order modulation [2018-09-14 15:50:28,269 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-14 15:50:28,270 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-14 15:50:28,270 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-14 15:50:28,270 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-14 15:50:28,270 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-14 15:50:28,270 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-14 15:50:28,271 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-14 15:50:28,271 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-14 15:50:28,290 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-09-14 15:50:28,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-14 15:50:28,297 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:50:28,298 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:50:28,299 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:50:28,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1512438165, now seen corresponding path program 1 times [2018-09-14 15:50:28,308 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:50:28,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:28,366 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:28,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:28,367 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:50:28,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:28,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:28,426 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-14 15:50:28,426 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-14 15:50:28,426 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-14 15:50:28,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-09-14 15:50:28,443 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-09-14 15:50:28,443 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-14 15:50:28,446 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-09-14 15:50:28,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:50:28,469 INFO L93 Difference]: Finished difference Result 38 states and 45 transitions. [2018-09-14 15:50:28,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-09-14 15:50:28,470 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2018-09-14 15:50:28,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:50:28,480 INFO L225 Difference]: With dead ends: 38 [2018-09-14 15:50:28,480 INFO L226 Difference]: Without dead ends: 19 [2018-09-14 15:50:28,484 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 [2018-09-14 15:50:28,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-14 15:50:28,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-09-14 15:50:28,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-09-14 15:50:28,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-09-14 15:50:28,525 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 13 [2018-09-14 15:50:28,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:50:28,525 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-09-14 15:50:28,525 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-09-14 15:50:28,526 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-09-14 15:50:28,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-14 15:50:28,526 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:50:28,527 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:50:28,527 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:50:28,527 INFO L82 PathProgramCache]: Analyzing trace with hash -1030292873, now seen corresponding path program 1 times [2018-09-14 15:50:28,528 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:50:28,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:28,529 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:28,529 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:28,530 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:50:28,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:28,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:28,691 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-14 15:50:28,691 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-14 15:50:28,692 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-14 15:50:28,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-14 15:50:28,694 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-14 15:50:28,694 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-14 15:50:28,694 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-09-14 15:50:28,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:50:28,840 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2018-09-14 15:50:28,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-14 15:50:28,841 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2018-09-14 15:50:28,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:50:28,844 INFO L225 Difference]: With dead ends: 37 [2018-09-14 15:50:28,845 INFO L226 Difference]: Without dead ends: 26 [2018-09-14 15:50:28,846 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-14 15:50:28,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-14 15:50:28,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 21. [2018-09-14 15:50:28,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-14 15:50:28,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-09-14 15:50:28,857 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 14 [2018-09-14 15:50:28,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:50:28,858 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-09-14 15:50:28,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-14 15:50:28,858 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-09-14 15:50:28,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-14 15:50:28,859 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:50:28,859 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:50:28,860 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:50:28,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1364873137, now seen corresponding path program 1 times [2018-09-14 15:50:28,861 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:50:28,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:28,863 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:28,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:28,863 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:50:28,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:29,055 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:29,056 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:29,056 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 [2018-09-14 15:50:29,070 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:29,071 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:50:29,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:29,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:29,179 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:50:29,182 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:29,205 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:50:29,206 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:50:29,497 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:29,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:29,876 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2018-09-14 15:50:29,884 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:29,895 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:50:29,896 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:21, output treesize:13 [2018-09-14 15:50:30,999 WARN L178 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:50:31,007 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:31,028 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:31,029 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 [2018-09-14 15:50:31,047 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:31,047 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:50:31,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:31,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:31,092 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:31,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:32,426 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:32,427 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:50:32,427 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7, 4, 4] total 15 [2018-09-14 15:50:32,428 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:50:32,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-14 15:50:32,429 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-14 15:50:32,429 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=165, Unknown=1, NotChecked=0, Total=210 [2018-09-14 15:50:32,429 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 8 states. [2018-09-14 15:50:32,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:50:32,862 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2018-09-14 15:50:32,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-14 15:50:32,863 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2018-09-14 15:50:32,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:50:32,864 INFO L225 Difference]: With dead ends: 48 [2018-09-14 15:50:32,864 INFO L226 Difference]: Without dead ends: 37 [2018-09-14 15:50:32,866 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=57, Invalid=214, Unknown=1, NotChecked=0, Total=272 [2018-09-14 15:50:32,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-14 15:50:32,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 31. [2018-09-14 15:50:32,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-09-14 15:50:32,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2018-09-14 15:50:32,875 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 17 [2018-09-14 15:50:32,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:50:32,876 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2018-09-14 15:50:32,876 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-14 15:50:32,876 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2018-09-14 15:50:32,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-09-14 15:50:32,877 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:50:32,877 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:50:32,878 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:50:32,878 INFO L82 PathProgramCache]: Analyzing trace with hash 324735642, now seen corresponding path program 1 times [2018-09-14 15:50:32,878 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:50:32,879 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:32,879 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:32,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:32,880 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:50:32,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:33,202 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-09-14 15:50:33,202 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:33,203 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 [2018-09-14 15:50:33,225 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:33,225 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:50:33,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:33,260 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:33,327 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:50:33,327 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:33,341 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:50:33,341 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:50:33,654 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:33,655 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:34,129 WARN L178 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2018-09-14 15:50:34,135 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-09-14 15:50:34,139 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:34,142 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-09-14 15:50:34,143 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:34,149 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:50:34,150 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:13 [2018-09-14 15:50:34,504 WARN L178 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:50:35,605 WARN L178 SmtUtils]: Spent 341.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-09-14 15:50:35,615 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-14 15:50:35,636 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:35,636 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 [2018-09-14 15:50:35,651 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:35,652 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:50:35,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:35,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:35,697 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-09-14 15:50:35,698 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:39,642 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-09-14 15:50:39,644 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:50:39,644 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 12, 11, 5, 5] total 24 [2018-09-14 15:50:39,644 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:50:39,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-14 15:50:39,645 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-14 15:50:39,648 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=454, Unknown=4, NotChecked=0, Total=552 [2018-09-14 15:50:39,648 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 13 states. [2018-09-14 15:50:40,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:50:40,111 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2018-09-14 15:50:40,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-14 15:50:40,111 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 28 [2018-09-14 15:50:40,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:50:40,114 INFO L225 Difference]: With dead ends: 66 [2018-09-14 15:50:40,114 INFO L226 Difference]: Without dead ends: 48 [2018-09-14 15:50:40,116 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=128, Invalid=624, Unknown=4, NotChecked=0, Total=756 [2018-09-14 15:50:40,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-09-14 15:50:40,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2018-09-14 15:50:40,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-14 15:50:40,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2018-09-14 15:50:40,127 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 28 [2018-09-14 15:50:40,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:50:40,128 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2018-09-14 15:50:40,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-14 15:50:40,128 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2018-09-14 15:50:40,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-09-14 15:50:40,129 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:50:40,129 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:50:40,130 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:50:40,130 INFO L82 PathProgramCache]: Analyzing trace with hash -681866603, now seen corresponding path program 2 times [2018-09-14 15:50:40,130 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:50:40,131 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:40,131 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:50:40,132 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:40,132 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:50:40,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:40,308 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2018-09-14 15:50:40,309 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:40,309 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 [2018-09-14 15:50:40,324 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:50:40,325 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:50:40,348 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:50:40,349 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:50:40,352 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:40,365 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:50:40,365 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:40,379 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:50:40,379 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:50:40,692 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 29 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-09-14 15:50:40,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:41,255 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-09-14 15:50:41,257 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:41,265 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-09-14 15:50:41,268 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:41,274 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:50:41,274 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:13 [2018-09-14 15:50:42,385 WARN L178 SmtUtils]: Spent 1.09 s on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:50:43,821 WARN L178 SmtUtils]: Spent 1.40 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:50:44,232 WARN L178 SmtUtils]: Spent 338.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-09-14 15:50:44,243 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 29 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-09-14 15:50:44,271 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:44,271 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 [2018-09-14 15:50:44,288 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:50:44,288 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:50:44,337 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:50:44,337 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:50:44,342 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:44,364 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-09-14 15:50:44,364 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:51,305 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2018-09-14 15:50:51,306 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:50:51,306 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 14, 13, 6, 6] total 29 [2018-09-14 15:50:51,307 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:50:51,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-14 15:50:51,307 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-14 15:50:51,308 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=679, Unknown=6, NotChecked=0, Total=812 [2018-09-14 15:50:51,308 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 15 states. [2018-09-14 15:50:51,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:50:51,864 INFO L93 Difference]: Finished difference Result 85 states and 89 transitions. [2018-09-14 15:50:51,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-14 15:50:51,867 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 39 [2018-09-14 15:50:51,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:50:51,868 INFO L225 Difference]: With dead ends: 85 [2018-09-14 15:50:51,869 INFO L226 Difference]: Without dead ends: 59 [2018-09-14 15:50:51,870 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=163, Invalid=887, Unknown=6, NotChecked=0, Total=1056 [2018-09-14 15:50:51,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2018-09-14 15:50:51,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 53. [2018-09-14 15:50:51,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-09-14 15:50:51,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2018-09-14 15:50:51,884 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 39 [2018-09-14 15:50:51,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:50:51,884 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2018-09-14 15:50:51,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-14 15:50:51,885 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2018-09-14 15:50:51,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-14 15:50:51,886 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:50:51,887 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:50:51,887 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:50:51,887 INFO L82 PathProgramCache]: Analyzing trace with hash 661977312, now seen corresponding path program 3 times [2018-09-14 15:50:51,887 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:50:51,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:51,888 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:50:51,888 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:50:51,889 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:50:51,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:50:52,130 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2018-09-14 15:50:52,130 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:52,130 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 [2018-09-14 15:50:52,139 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:50:52,139 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-14 15:50:52,203 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-09-14 15:50:52,204 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:50:52,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:52,230 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:50:52,231 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:52,242 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:50:52,243 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:50:52,618 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-14 15:50:52,619 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:50:53,299 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-09-14 15:50:53,301 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:53,305 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-09-14 15:50:53,306 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-09-14 15:50:53,312 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:50:53,312 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:13 [2018-09-14 15:50:53,670 WARN L178 SmtUtils]: Spent 328.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:50:54,195 WARN L178 SmtUtils]: Spent 340.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:50:54,631 WARN L178 SmtUtils]: Spent 338.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-09-14 15:50:54,644 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 11 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-09-14 15:50:54,665 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:50:54,666 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 [2018-09-14 15:50:54,681 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:50:54,681 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-14 15:50:54,926 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-09-14 15:50:54,926 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:50:54,932 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:50:54,979 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2018-09-14 15:50:54,979 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:51:04,654 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2018-09-14 15:51:04,657 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:51:04,657 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 16, 15, 7, 7] total 34 [2018-09-14 15:51:04,657 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:51:04,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-14 15:51:04,658 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-14 15:51:04,659 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=949, Unknown=8, NotChecked=0, Total=1122 [2018-09-14 15:51:04,659 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 17 states. [2018-09-14 15:51:05,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:51:05,796 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2018-09-14 15:51:05,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-14 15:51:05,797 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 50 [2018-09-14 15:51:05,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:51:05,798 INFO L225 Difference]: With dead ends: 104 [2018-09-14 15:51:05,798 INFO L226 Difference]: Without dead ends: 70 [2018-09-14 15:51:05,800 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=203, Invalid=1195, Unknown=8, NotChecked=0, Total=1406 [2018-09-14 15:51:05,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2018-09-14 15:51:05,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2018-09-14 15:51:05,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-09-14 15:51:05,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2018-09-14 15:51:05,814 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 50 [2018-09-14 15:51:05,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:51:05,814 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2018-09-14 15:51:05,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-14 15:51:05,817 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2018-09-14 15:51:05,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2018-09-14 15:51:05,819 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:51:05,822 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:51:05,822 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:51:05,823 INFO L82 PathProgramCache]: Analyzing trace with hash -2141529893, now seen corresponding path program 4 times [2018-09-14 15:51:05,823 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:51:05,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:51:05,824 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:51:05,824 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:51:05,824 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:51:05,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:51:06,014 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-09-14 15:51:06,015 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:51:06,015 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 [2018-09-14 15:51:06,024 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-14 15:51:06,024 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-14 15:51:06,067 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-14 15:51:06,068 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:51:06,071 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:51:06,136 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:51:06,137 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:51:06,263 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:51:06,264 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:51:07,164 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 7 proven. 86 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-09-14 15:51:07,165 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:51:07,624 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-09-14 15:51:07,634 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:51:07,636 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-09-14 15:51:07,637 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-09-14 15:51:07,641 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:51:07,642 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:13 [2018-09-14 15:51:08,780 WARN L178 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:51:09,187 WARN L178 SmtUtils]: Spent 337.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:51:09,355 WARN L178 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:51:09,856 WARN L178 SmtUtils]: Spent 335.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-09-14 15:51:09,878 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 7 proven. 86 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-09-14 15:51:09,900 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:51:09,901 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 [2018-09-14 15:51:09,916 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-14 15:51:09,916 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-14 15:51:10,003 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-14 15:51:10,003 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:51:10,009 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:51:10,026 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2018-09-14 15:51:10,027 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:51:27,553 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 8 proven. 40 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2018-09-14 15:51:27,555 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:51:27,556 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 18, 17, 8, 8] total 39 [2018-09-14 15:51:27,556 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:51:27,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-14 15:51:27,558 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-14 15:51:27,559 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1260, Unknown=14, NotChecked=0, Total=1482 [2018-09-14 15:51:27,559 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 19 states. [2018-09-14 15:51:28,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:51:28,314 INFO L93 Difference]: Finished difference Result 123 states and 127 transitions. [2018-09-14 15:51:28,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-14 15:51:28,314 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 61 [2018-09-14 15:51:28,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:51:28,316 INFO L225 Difference]: With dead ends: 123 [2018-09-14 15:51:28,316 INFO L226 Difference]: Without dead ends: 81 [2018-09-14 15:51:28,318 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 211 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 358 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=248, Invalid=1544, Unknown=14, NotChecked=0, Total=1806 [2018-09-14 15:51:28,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2018-09-14 15:51:28,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 75. [2018-09-14 15:51:28,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2018-09-14 15:51:28,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2018-09-14 15:51:28,333 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 61 [2018-09-14 15:51:28,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:51:28,334 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2018-09-14 15:51:28,334 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-14 15:51:28,334 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2018-09-14 15:51:28,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2018-09-14 15:51:28,335 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:51:28,335 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:51:28,336 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:51:28,336 INFO L82 PathProgramCache]: Analyzing trace with hash -93138138, now seen corresponding path program 5 times [2018-09-14 15:51:28,336 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:51:28,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:51:28,337 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:51:28,337 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:51:28,337 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:51:28,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:51:28,624 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 10 proven. 57 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2018-09-14 15:51:28,625 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:51:28,625 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 [2018-09-14 15:51:28,632 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-14 15:51:28,632 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:51:29,042 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-09-14 15:51:29,043 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:51:29,047 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:51:29,087 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:51:29,088 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:51:29,096 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:51:29,097 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:51:29,724 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 12 proven. 122 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-09-14 15:51:29,724 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:51:30,317 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-09-14 15:51:30,318 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:51:30,320 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-09-14 15:51:30,322 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-09-14 15:51:30,325 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:51:30,325 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:13 [2018-09-14 15:51:31,464 WARN L178 SmtUtils]: Spent 1.09 s on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:51:31,904 WARN L178 SmtUtils]: Spent 335.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:51:33,317 WARN L178 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:51:33,702 WARN L178 SmtUtils]: Spent 336.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:51:35,464 WARN L178 SmtUtils]: Spent 1.29 s on a formula simplification that was a NOOP. DAG size: 11 [2018-09-14 15:51:35,478 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 12 proven. 122 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2018-09-14 15:51:35,499 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:51:35,499 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 [2018-09-14 15:51:35,514 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-14 15:51:35,514 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:51:36,724 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-09-14 15:51:36,725 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:51:36,731 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:51:36,742 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2018-09-14 15:51:36,742 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:51:56,511 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 10 proven. 57 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2018-09-14 15:51:56,513 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:51:56,513 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 20, 19, 9, 9] total 44 [2018-09-14 15:51:56,513 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:51:56,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-09-14 15:51:56,514 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-09-14 15:51:56,515 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=1619, Unknown=17, NotChecked=0, Total=1892 [2018-09-14 15:51:56,515 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand 21 states. [2018-09-14 15:51:57,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:51:57,413 INFO L93 Difference]: Finished difference Result 142 states and 146 transitions. [2018-09-14 15:51:57,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-09-14 15:51:57,414 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 72 [2018-09-14 15:51:57,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:51:57,415 INFO L225 Difference]: With dead ends: 142 [2018-09-14 15:51:57,415 INFO L226 Difference]: Without dead ends: 92 [2018-09-14 15:51:57,417 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 251 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=298, Invalid=1941, Unknown=17, NotChecked=0, Total=2256 [2018-09-14 15:51:57,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-09-14 15:51:57,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 86. [2018-09-14 15:51:57,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-09-14 15:51:57,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2018-09-14 15:51:57,437 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 72 [2018-09-14 15:51:57,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:51:57,437 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2018-09-14 15:51:57,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-09-14 15:51:57,438 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2018-09-14 15:51:57,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-09-14 15:51:57,439 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:51:57,439 INFO L376 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:51:57,440 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:51:57,440 INFO L82 PathProgramCache]: Analyzing trace with hash 262904609, now seen corresponding path program 6 times [2018-09-14 15:51:57,440 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:51:57,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:51:57,441 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:51:57,441 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:51:57,441 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:51:57,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:51:57,735 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 12 proven. 77 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2018-09-14 15:51:57,735 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:51:57,736 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 [2018-09-14 15:51:57,743 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-14 15:51:57,743 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-14 15:51:58,037 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-09-14 15:51:58,038 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:51:58,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:51:58,090 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:51:58,090 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:51:58,115 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:51:58,115 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:51:59,146 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 26 proven. 156 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-09-14 15:51:59,146 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:52:00,010 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-09-14 15:52:00,012 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:52:00,014 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-09-14 15:52:00,017 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-09-14 15:52:00,021 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:52:00,022 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:13 [2018-09-14 15:52:00,384 WARN L178 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:52:02,119 WARN L178 SmtUtils]: Spent 1.67 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:52:02,775 WARN L178 SmtUtils]: Spent 344.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:52:04,233 WARN L178 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:52:04,402 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 26 proven. 156 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-09-14 15:52:04,423 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:52:04,423 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 [2018-09-14 15:52:04,439 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-14 15:52:04,439 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-14 15:52:30,288 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-09-14 15:52:30,288 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:52:30,296 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:52:30,313 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2018-09-14 15:52:30,313 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:52:49,991 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 12 proven. 77 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2018-09-14 15:52:49,994 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:52:49,995 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 22, 21, 10, 10] total 49 [2018-09-14 15:52:49,995 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:52:49,995 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-09-14 15:52:49,995 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-09-14 15:52:49,996 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=2027, Unknown=16, NotChecked=0, Total=2352 [2018-09-14 15:52:49,997 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand 23 states. [2018-09-14 15:52:51,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:52:51,233 INFO L93 Difference]: Finished difference Result 161 states and 165 transitions. [2018-09-14 15:52:51,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-09-14 15:52:51,234 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 83 [2018-09-14 15:52:51,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:52:51,236 INFO L225 Difference]: With dead ends: 161 [2018-09-14 15:52:51,236 INFO L226 Difference]: Without dead ends: 103 [2018-09-14 15:52:51,238 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 291 SyntacticMatches, 2 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 26.0s TimeCoverageRelationStatistics Valid=353, Invalid=2387, Unknown=16, NotChecked=0, Total=2756 [2018-09-14 15:52:51,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-09-14 15:52:51,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2018-09-14 15:52:51,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2018-09-14 15:52:51,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2018-09-14 15:52:51,259 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 83 [2018-09-14 15:52:51,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:52:51,259 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2018-09-14 15:52:51,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-09-14 15:52:51,260 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2018-09-14 15:52:51,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2018-09-14 15:52:51,261 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:52:51,261 INFO L376 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:52:51,261 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:52:51,262 INFO L82 PathProgramCache]: Analyzing trace with hash 679256428, now seen corresponding path program 7 times [2018-09-14 15:52:51,262 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:52:51,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:52:51,263 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:52:51,263 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:52:51,263 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:52:51,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:52:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 14 proven. 100 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2018-09-14 15:52:51,435 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:52:51,435 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 [2018-09-14 15:52:51,442 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:52:51,443 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:52:51,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:52:51,475 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:52:51,493 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:52:51,494 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:52:51,507 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:52:51,507 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:52:52,303 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 13 proven. 224 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-09-14 15:52:52,303 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:52:53,330 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-09-14 15:52:53,331 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:52:53,334 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-09-14 15:52:53,335 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-09-14 15:52:53,338 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:52:53,338 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:13 [2018-09-14 15:52:53,704 WARN L178 SmtUtils]: Spent 329.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:52:56,163 WARN L178 SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:52:59,049 WARN L178 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:52:59,459 WARN L178 SmtUtils]: Spent 344.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:52:59,858 WARN L178 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:53:01,606 WARN L178 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:53:02,889 WARN L178 SmtUtils]: Spent 1.12 s on a formula simplification that was a NOOP. DAG size: 11 [2018-09-14 15:53:02,949 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 13 proven. 224 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-09-14 15:53:02,970 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:53:02,970 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 [2018-09-14 15:53:02,985 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:53:02,985 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-14 15:53:03,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:53:03,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:53:03,199 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 203 trivial. 0 not checked. [2018-09-14 15:53:03,199 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:53:30,632 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 14 proven. 100 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2018-09-14 15:53:30,633 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:53:30,634 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 24, 23, 11, 11] total 54 [2018-09-14 15:53:30,634 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:53:30,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-09-14 15:53:30,635 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-09-14 15:53:30,636 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=367, Invalid=2469, Unknown=26, NotChecked=0, Total=2862 [2018-09-14 15:53:30,636 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand 25 states. [2018-09-14 15:53:31,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:53:31,998 INFO L93 Difference]: Finished difference Result 180 states and 184 transitions. [2018-09-14 15:53:31,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-09-14 15:53:31,998 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 94 [2018-09-14 15:53:31,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:53:32,000 INFO L225 Difference]: With dead ends: 180 [2018-09-14 15:53:32,001 INFO L226 Difference]: Without dead ends: 114 [2018-09-14 15:53:32,003 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 389 GetRequests, 331 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 38.7s TimeCoverageRelationStatistics Valid=413, Invalid=2867, Unknown=26, NotChecked=0, Total=3306 [2018-09-14 15:53:32,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-09-14 15:53:32,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 108. [2018-09-14 15:53:32,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2018-09-14 15:53:32,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2018-09-14 15:53:32,029 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 94 [2018-09-14 15:53:32,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:53:32,030 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2018-09-14 15:53:32,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-09-14 15:53:32,030 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2018-09-14 15:53:32,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-09-14 15:53:32,032 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:53:32,032 INFO L376 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:53:32,032 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:53:32,032 INFO L82 PathProgramCache]: Analyzing trace with hash -1487548057, now seen corresponding path program 8 times [2018-09-14 15:53:32,033 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:53:32,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:53:32,033 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-14 15:53:32,034 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:53:32,034 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:53:32,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:53:32,484 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 16 proven. 126 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2018-09-14 15:53:32,484 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:53:32,484 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 [2018-09-14 15:53:32,492 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:53:32,492 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:53:32,526 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:53:32,526 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:53:32,529 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:53:32,535 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2018-09-14 15:53:32,536 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:53:32,550 INFO L267 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:53:32,551 INFO L202 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:22, output treesize:18 [2018-09-14 15:53:33,223 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 15 proven. 284 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-09-14 15:53:33,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:53:34,050 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2018-09-14 15:53:34,052 INFO L267 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2018-09-14 15:53:34,059 INFO L477 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2018-09-14 15:53:34,061 INFO L267 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2018-09-14 15:53:34,064 INFO L267 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2018-09-14 15:53:34,065 INFO L202 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:13 [2018-09-14 15:53:35,201 WARN L178 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 10 [2018-09-14 15:53:36,361 WARN L178 SmtUtils]: Spent 1.10 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:53:36,843 WARN L178 SmtUtils]: Spent 348.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:53:37,245 WARN L178 SmtUtils]: Spent 343.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:53:40,480 WARN L178 SmtUtils]: Spent 345.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:53:41,892 WARN L178 SmtUtils]: Spent 1.35 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:53:43,168 WARN L178 SmtUtils]: Spent 1.10 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-14 15:53:47,668 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 15 proven. 284 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2018-09-14 15:53:47,689 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:53:47,689 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 [2018-09-14 15:53:47,704 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-14 15:53:47,704 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-14 15:53:47,838 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-14 15:53:47,838 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-14 15:53:47,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-14 15:53:47,874 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2018-09-14 15:53:47,874 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-14 15:54:22,687 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 16 proven. 126 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2018-09-14 15:54:22,688 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-14 15:54:22,689 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 26, 25, 12, 12] total 59 [2018-09-14 15:54:22,689 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-14 15:54:22,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-09-14 15:54:22,690 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-09-14 15:54:22,692 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=430, Invalid=2959, Unknown=33, NotChecked=0, Total=3422 [2018-09-14 15:54:22,693 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 27 states. [2018-09-14 15:54:23,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-14 15:54:23,819 INFO L93 Difference]: Finished difference Result 199 states and 203 transitions. [2018-09-14 15:54:23,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-09-14 15:54:23,826 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 105 [2018-09-14 15:54:23,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-14 15:54:23,827 INFO L225 Difference]: With dead ends: 199 [2018-09-14 15:54:23,827 INFO L226 Difference]: Without dead ends: 125 [2018-09-14 15:54:23,830 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 371 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 844 ImplicationChecksByTransitivity, 50.1s TimeCoverageRelationStatistics Valid=478, Invalid=3395, Unknown=33, NotChecked=0, Total=3906 [2018-09-14 15:54:23,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2018-09-14 15:54:23,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 119. [2018-09-14 15:54:23,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-09-14 15:54:23,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 120 transitions. [2018-09-14 15:54:23,857 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 120 transitions. Word has length 105 [2018-09-14 15:54:23,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-14 15:54:23,858 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 120 transitions. [2018-09-14 15:54:23,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-09-14 15:54:23,858 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 120 transitions. [2018-09-14 15:54:23,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2018-09-14 15:54:23,859 INFO L368 BasicCegarLoop]: Found error trace [2018-09-14 15:54:23,860 INFO L376 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-14 15:54:23,860 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-14 15:54:23,860 INFO L82 PathProgramCache]: Analyzing trace with hash -1313184846, now seen corresponding path program 9 times [2018-09-14 15:54:23,861 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-14 15:54:23,862 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:54:23,862 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-14 15:54:23,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-14 15:54:23,863 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-14 15:54:23,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-14 15:54:24,194 INFO L134 CoverageAnalysis]: Checked inductivity of 488 backedges. 18 proven. 155 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-09-14 15:54:24,194 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-14 15:54:24,194 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 [2018-09-14 15:54:24,203 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-14 15:54:24,203 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown