java -Xmx8000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --generate-csv --csv-dir csv -s ../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem14_label48_true-unreach-call_false-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-dd2f093 [2018-07-24 14:29:37,438 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-07-24 14:29:37,441 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-07-24 14:29:37,459 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-07-24 14:29:37,459 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-07-24 14:29:37,460 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-07-24 14:29:37,462 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-07-24 14:29:37,463 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-07-24 14:29:37,465 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-07-24 14:29:37,466 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-07-24 14:29:37,467 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-07-24 14:29:37,467 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-07-24 14:29:37,468 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-07-24 14:29:37,471 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-07-24 14:29:37,474 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-07-24 14:29:37,475 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-07-24 14:29:37,481 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-07-24 14:29:37,486 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-07-24 14:29:37,490 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-07-24 14:29:37,492 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-07-24 14:29:37,493 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-07-24 14:29:37,494 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-07-24 14:29:37,499 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-07-24 14:29:37,499 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-07-24 14:29:37,499 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-07-24 14:29:37,502 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-07-24 14:29:37,503 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-07-24 14:29:37,504 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-07-24 14:29:37,505 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-07-24 14:29:37,508 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-07-24 14:29:37,510 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-07-24 14:29:37,510 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-07-24 14:29:37,510 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-07-24 14:29:37,511 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-07-24 14:29:37,514 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-07-24 14:29:37,514 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-07-24 14:29:37,515 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 [2018-07-24 14:29:37,545 INFO L110 SettingsManager]: Loading preferences was successful [2018-07-24 14:29:37,545 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-07-24 14:29:37,546 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-07-24 14:29:37,546 INFO L133 SettingsManager]: * User list type=DISABLED [2018-07-24 14:29:37,546 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-07-24 14:29:37,547 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-07-24 14:29:37,547 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-07-24 14:29:37,547 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-07-24 14:29:37,547 INFO L133 SettingsManager]: * Log string format=TERM [2018-07-24 14:29:37,548 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-07-24 14:29:37,548 INFO L133 SettingsManager]: * Interval Domain=false [2018-07-24 14:29:37,549 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-07-24 14:29:37,549 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-07-24 14:29:37,549 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-07-24 14:29:37,550 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-07-24 14:29:37,550 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-07-24 14:29:37,550 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-07-24 14:29:37,551 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-07-24 14:29:37,551 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-07-24 14:29:37,551 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-07-24 14:29:37,551 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-07-24 14:29:37,553 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-07-24 14:29:37,553 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-07-24 14:29:37,553 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-07-24 14:29:37,553 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-07-24 14:29:37,553 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-07-24 14:29:37,554 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-07-24 14:29:37,554 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-07-24 14:29:37,554 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-07-24 14:29:37,554 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-07-24 14:29:37,554 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-07-24 14:29:37,554 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-07-24 14:29:37,555 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-07-24 14:29:37,617 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-07-24 14:29:37,632 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-07-24 14:29:37,636 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-07-24 14:29:37,638 INFO L271 PluginConnector]: Initializing CDTParser... [2018-07-24 14:29:37,638 INFO L276 PluginConnector]: CDTParser initialized [2018-07-24 14:29:37,639 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem14_label48_true-unreach-call_false-termination.c [2018-07-24 14:29:37,981 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54d0ee48e/9bd2b41398ef47b3874672a37de0ce42/FLAG0c9f57aab [2018-07-24 14:29:38,281 INFO L276 CDTParser]: Found 1 translation units. [2018-07-24 14:29:38,282 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem14_label48_true-unreach-call_false-termination.c [2018-07-24 14:29:38,310 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54d0ee48e/9bd2b41398ef47b3874672a37de0ce42/FLAG0c9f57aab [2018-07-24 14:29:38,329 INFO L332 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/54d0ee48e/9bd2b41398ef47b3874672a37de0ce42 [2018-07-24 14:29:38,342 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-07-24 14:29:38,344 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-07-24 14:29:38,346 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-07-24 14:29:38,346 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-07-24 14:29:38,357 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-07-24 14:29:38,358 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.07 02:29:38" (1/1) ... [2018-07-24 14:29:38,362 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@325dd63d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:38, skipping insertion in model container [2018-07-24 14:29:38,363 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.07 02:29:38" (1/1) ... [2018-07-24 14:29:38,628 INFO L179 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-07-24 14:29:39,017 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-24 14:29:39,033 INFO L422 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-07-24 14:29:39,193 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-24 14:29:39,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39 WrapperNode [2018-07-24 14:29:39,264 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-07-24 14:29:39,265 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-07-24 14:29:39,266 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-07-24 14:29:39,266 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-07-24 14:29:39,277 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,323 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,439 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-07-24 14:29:39,440 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-07-24 14:29:39,440 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-07-24 14:29:39,440 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-07-24 14:29:39,455 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,456 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,474 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,475 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,739 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,766 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,784 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (1/1) ... [2018-07-24 14:29:39,799 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-07-24 14:29:39,800 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-07-24 14:29:39,800 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-07-24 14:29:39,800 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-07-24 14:29:39,801 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (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 [2018-07-24 14:29:39,878 INFO L130 BoogieDeclarations]: Found specification of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_output [2018-07-24 14:29:39,879 INFO L138 BoogieDeclarations]: Found implementation of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_output [2018-07-24 14:29:39,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-07-24 14:29:39,879 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-07-24 14:29:39,880 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-07-24 14:29:39,880 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-07-24 14:29:39,880 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-07-24 14:29:39,880 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-07-24 14:29:43,848 INFO L261 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-07-24 14:29:43,849 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.07 02:29:43 BoogieIcfgContainer [2018-07-24 14:29:43,849 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-07-24 14:29:43,850 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-07-24 14:29:43,850 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-07-24 14:29:43,854 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-07-24 14:29:43,854 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.07 02:29:38" (1/3) ... [2018-07-24 14:29:43,855 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ae8fd29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.07 02:29:43, skipping insertion in model container [2018-07-24 14:29:43,855 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.07 02:29:39" (2/3) ... [2018-07-24 14:29:43,856 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ae8fd29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.07 02:29:43, skipping insertion in model container [2018-07-24 14:29:43,856 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.07 02:29:43" (3/3) ... [2018-07-24 14:29:43,858 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem14_label48_true-unreach-call_false-termination.c [2018-07-24 14:29:43,868 INFO L132 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-07-24 14:29:43,879 INFO L144 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-07-24 14:29:43,932 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2018-07-24 14:29:43,933 INFO L373 AbstractCegarLoop]: Interprodecural is true [2018-07-24 14:29:43,934 INFO L374 AbstractCegarLoop]: Hoare is true [2018-07-24 14:29:43,934 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-07-24 14:29:43,934 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-07-24 14:29:43,934 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-07-24 14:29:43,934 INFO L378 AbstractCegarLoop]: Difference is false [2018-07-24 14:29:43,934 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-07-24 14:29:43,934 INFO L384 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-07-24 14:29:43,960 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states. [2018-07-24 14:29:43,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-07-24 14:29:43,972 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:29:43,973 INFO L353 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:29:43,974 INFO L414 AbstractCegarLoop]: === Iteration 1 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:29:43,979 INFO L82 PathProgramCache]: Analyzing trace with hash -1407725689, now seen corresponding path program 1 times [2018-07-24 14:29:43,982 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:29:44,032 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:44,032 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:29:44,033 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:44,033 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:29:44,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:29:44,382 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 14:29:44,385 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-24 14:29:44,385 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-07-24 14:29:44,386 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-24 14:29:44,392 INFO L450 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-07-24 14:29:44,407 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-07-24 14:29:44,408 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-24 14:29:44,411 INFO L87 Difference]: Start difference. First operand 255 states. Second operand 4 states. [2018-07-24 14:29:47,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:29:47,593 INFO L93 Difference]: Finished difference Result 894 states and 1610 transitions. [2018-07-24 14:29:47,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-07-24 14:29:47,596 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 45 [2018-07-24 14:29:47,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:29:47,619 INFO L225 Difference]: With dead ends: 894 [2018-07-24 14:29:47,619 INFO L226 Difference]: Without dead ends: 633 [2018-07-24 14:29:47,629 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-24 14:29:47,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2018-07-24 14:29:47,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 434. [2018-07-24 14:29:47,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2018-07-24 14:29:47,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 662 transitions. [2018-07-24 14:29:47,715 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 662 transitions. Word has length 45 [2018-07-24 14:29:47,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:29:47,716 INFO L471 AbstractCegarLoop]: Abstraction has 434 states and 662 transitions. [2018-07-24 14:29:47,716 INFO L472 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-07-24 14:29:47,716 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 662 transitions. [2018-07-24 14:29:47,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2018-07-24 14:29:47,724 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:29:47,725 INFO L353 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:29:47,725 INFO L414 AbstractCegarLoop]: === Iteration 2 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:29:47,725 INFO L82 PathProgramCache]: Analyzing trace with hash -950456226, now seen corresponding path program 1 times [2018-07-24 14:29:47,726 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:29:47,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:47,727 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:29:47,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:47,727 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:29:47,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:29:48,039 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 14:29:48,039 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-24 14:29:48,040 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-07-24 14:29:48,040 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-24 14:29:48,042 INFO L450 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-07-24 14:29:48,042 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-07-24 14:29:48,043 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-24 14:29:48,043 INFO L87 Difference]: Start difference. First operand 434 states and 662 transitions. Second operand 4 states. [2018-07-24 14:29:51,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:29:51,091 INFO L93 Difference]: Finished difference Result 1594 states and 2534 transitions. [2018-07-24 14:29:51,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-07-24 14:29:51,093 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 129 [2018-07-24 14:29:51,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:29:51,100 INFO L225 Difference]: With dead ends: 1594 [2018-07-24 14:29:51,100 INFO L226 Difference]: Without dead ends: 780 [2018-07-24 14:29:51,108 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-24 14:29:51,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 780 states. [2018-07-24 14:29:51,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 780 to 780. [2018-07-24 14:29:51,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 780 states. [2018-07-24 14:29:51,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 780 states to 780 states and 1153 transitions. [2018-07-24 14:29:51,179 INFO L78 Accepts]: Start accepts. Automaton has 780 states and 1153 transitions. Word has length 129 [2018-07-24 14:29:51,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:29:51,180 INFO L471 AbstractCegarLoop]: Abstraction has 780 states and 1153 transitions. [2018-07-24 14:29:51,180 INFO L472 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-07-24 14:29:51,180 INFO L276 IsEmpty]: Start isEmpty. Operand 780 states and 1153 transitions. [2018-07-24 14:29:51,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2018-07-24 14:29:51,198 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:29:51,198 INFO L353 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:29:51,198 INFO L414 AbstractCegarLoop]: === Iteration 3 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:29:51,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1536030666, now seen corresponding path program 1 times [2018-07-24 14:29:51,199 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:29:51,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:51,200 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:29:51,200 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:51,200 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:29:51,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:29:51,427 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 14:29:51,428 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-24 14:29:51,428 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-07-24 14:29:51,428 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-24 14:29:51,431 INFO L450 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-07-24 14:29:51,432 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-07-24 14:29:51,432 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-24 14:29:51,432 INFO L87 Difference]: Start difference. First operand 780 states and 1153 transitions. Second operand 4 states. [2018-07-24 14:29:54,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:29:54,060 INFO L93 Difference]: Finished difference Result 3018 states and 4611 transitions. [2018-07-24 14:29:54,060 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-07-24 14:29:54,060 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 141 [2018-07-24 14:29:54,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:29:54,081 INFO L225 Difference]: With dead ends: 3018 [2018-07-24 14:29:54,082 INFO L226 Difference]: Without dead ends: 2244 [2018-07-24 14:29:54,092 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-24 14:29:54,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2244 states. [2018-07-24 14:29:54,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2244 to 2244. [2018-07-24 14:29:54,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2244 states. [2018-07-24 14:29:54,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2244 states to 2244 states and 3182 transitions. [2018-07-24 14:29:54,178 INFO L78 Accepts]: Start accepts. Automaton has 2244 states and 3182 transitions. Word has length 141 [2018-07-24 14:29:54,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:29:54,179 INFO L471 AbstractCegarLoop]: Abstraction has 2244 states and 3182 transitions. [2018-07-24 14:29:54,179 INFO L472 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-07-24 14:29:54,179 INFO L276 IsEmpty]: Start isEmpty. Operand 2244 states and 3182 transitions. [2018-07-24 14:29:54,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-07-24 14:29:54,188 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:29:54,188 INFO L353 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:29:54,188 INFO L414 AbstractCegarLoop]: === Iteration 4 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:29:54,192 INFO L82 PathProgramCache]: Analyzing trace with hash -487845836, now seen corresponding path program 1 times [2018-07-24 14:29:54,192 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:29:54,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:54,193 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:29:54,193 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:54,194 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:29:54,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:29:54,599 WARN L169 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 4 [2018-07-24 14:29:54,687 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2018-07-24 14:29:54,687 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:29:54,688 INFO L191 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 [2018-07-24 14:29:54,705 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:29:54,705 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:29:54,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:29:54,831 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:29:55,320 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 161 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 14:29:55,320 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:29:55,580 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 161 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 14:29:55,603 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:29:55,603 INFO L191 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 [2018-07-24 14:29:55,621 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:29:55,621 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:29:55,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:29:55,824 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:29:55,986 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 77 proven. 2 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-07-24 14:29:55,986 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:29:56,481 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-07-24 14:29:56,483 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 4 imperfect interpolant sequences. [2018-07-24 14:29:56,484 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5, 5, 5] total 11 [2018-07-24 14:29:56,484 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-24 14:29:56,485 INFO L450 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-07-24 14:29:56,485 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-07-24 14:29:56,485 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2018-07-24 14:29:56,486 INFO L87 Difference]: Start difference. First operand 2244 states and 3182 transitions. Second operand 5 states. [2018-07-24 14:29:59,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:29:59,449 INFO L93 Difference]: Finished difference Result 5240 states and 7600 transitions. [2018-07-24 14:29:59,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-07-24 14:29:59,451 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 242 [2018-07-24 14:29:59,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:29:59,473 INFO L225 Difference]: With dead ends: 5240 [2018-07-24 14:29:59,473 INFO L226 Difference]: Without dead ends: 3002 [2018-07-24 14:29:59,489 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 976 GetRequests, 956 SyntacticMatches, 10 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2018-07-24 14:29:59,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3002 states. [2018-07-24 14:29:59,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3002 to 3002. [2018-07-24 14:29:59,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3002 states. [2018-07-24 14:29:59,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3002 states to 3002 states and 4075 transitions. [2018-07-24 14:29:59,581 INFO L78 Accepts]: Start accepts. Automaton has 3002 states and 4075 transitions. Word has length 242 [2018-07-24 14:29:59,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:29:59,582 INFO L471 AbstractCegarLoop]: Abstraction has 3002 states and 4075 transitions. [2018-07-24 14:29:59,582 INFO L472 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-07-24 14:29:59,582 INFO L276 IsEmpty]: Start isEmpty. Operand 3002 states and 4075 transitions. [2018-07-24 14:29:59,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2018-07-24 14:29:59,590 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:29:59,591 INFO L353 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:29:59,591 INFO L414 AbstractCegarLoop]: === Iteration 5 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:29:59,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1786995571, now seen corresponding path program 1 times [2018-07-24 14:29:59,591 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:29:59,592 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:59,593 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:29:59,593 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:29:59,593 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:29:59,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:00,173 WARN L169 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 10 [2018-07-24 14:30:00,362 WARN L169 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2018-07-24 14:30:00,545 WARN L169 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2018-07-24 14:30:00,973 WARN L169 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 40 [2018-07-24 14:30:01,232 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 161 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-24 14:30:01,233 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:01,233 INFO L191 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 [2018-07-24 14:30:01,244 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:01,244 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:01,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:01,340 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:01,646 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 124 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2018-07-24 14:30:01,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:02,662 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 76 proven. 82 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-24 14:30:02,683 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-07-24 14:30:02,683 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [11, 5] total 16 [2018-07-24 14:30:02,683 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-24 14:30:02,684 INFO L450 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-07-24 14:30:02,684 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-07-24 14:30:02,684 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2018-07-24 14:30:02,685 INFO L87 Difference]: Start difference. First operand 3002 states and 4075 transitions. Second operand 5 states. [2018-07-24 14:30:05,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:30:05,542 INFO L93 Difference]: Finished difference Result 8323 states and 11233 transitions. [2018-07-24 14:30:05,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-07-24 14:30:05,543 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 245 [2018-07-24 14:30:05,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:30:05,574 INFO L225 Difference]: With dead ends: 8323 [2018-07-24 14:30:05,574 INFO L226 Difference]: Without dead ends: 5327 [2018-07-24 14:30:05,593 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 485 SyntacticMatches, 4 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=94, Invalid=248, Unknown=0, NotChecked=0, Total=342 [2018-07-24 14:30:05,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5327 states. [2018-07-24 14:30:05,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5327 to 5271. [2018-07-24 14:30:05,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5271 states. [2018-07-24 14:30:05,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5271 states to 5271 states and 6999 transitions. [2018-07-24 14:30:05,731 INFO L78 Accepts]: Start accepts. Automaton has 5271 states and 6999 transitions. Word has length 245 [2018-07-24 14:30:05,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:30:05,732 INFO L471 AbstractCegarLoop]: Abstraction has 5271 states and 6999 transitions. [2018-07-24 14:30:05,732 INFO L472 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-07-24 14:30:05,732 INFO L276 IsEmpty]: Start isEmpty. Operand 5271 states and 6999 transitions. [2018-07-24 14:30:05,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 331 [2018-07-24 14:30:05,747 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:30:05,748 INFO L353 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:30:05,748 INFO L414 AbstractCegarLoop]: === Iteration 6 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:30:05,748 INFO L82 PathProgramCache]: Analyzing trace with hash -116272185, now seen corresponding path program 1 times [2018-07-24 14:30:05,748 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:30:05,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:05,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:05,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:05,750 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:30:05,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:06,266 WARN L169 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-07-24 14:30:06,472 WARN L169 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-07-24 14:30:06,715 WARN L169 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-07-24 14:30:07,158 WARN L169 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2018-07-24 14:30:07,708 WARN L169 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2018-07-24 14:30:08,117 INFO L134 CoverageAnalysis]: Checked inductivity of 371 backedges. 202 proven. 164 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-24 14:30:08,117 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:08,117 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 14:30:08,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:08,131 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:08,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:08,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:08,516 INFO L134 CoverageAnalysis]: Checked inductivity of 371 backedges. 279 proven. 53 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2018-07-24 14:30:08,517 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:09,097 INFO L134 CoverageAnalysis]: Checked inductivity of 371 backedges. 124 proven. 242 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-24 14:30:09,117 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:09,118 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 6 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 6 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 14:30:09,134 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:09,134 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:09,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:09,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:09,973 INFO L134 CoverageAnalysis]: Checked inductivity of 371 backedges. 279 proven. 53 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2018-07-24 14:30:09,973 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:10,549 INFO L134 CoverageAnalysis]: Checked inductivity of 371 backedges. 124 proven. 242 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-24 14:30:10,551 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:30:10,551 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8, 8, 8, 8] total 26 [2018-07-24 14:30:10,552 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:30:10,553 INFO L450 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-07-24 14:30:10,553 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-07-24 14:30:10,554 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=499, Unknown=0, NotChecked=0, Total=650 [2018-07-24 14:30:10,554 INFO L87 Difference]: Start difference. First operand 5271 states and 6999 transitions. Second operand 15 states. [2018-07-24 14:30:16,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:30:16,108 INFO L93 Difference]: Finished difference Result 11782 states and 15624 transitions. [2018-07-24 14:30:16,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-07-24 14:30:16,109 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 330 [2018-07-24 14:30:16,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:30:16,138 INFO L225 Difference]: With dead ends: 11782 [2018-07-24 14:30:16,139 INFO L226 Difference]: Without dead ends: 6316 [2018-07-24 14:30:16,168 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 1364 GetRequests, 1316 SyntacticMatches, 7 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=431, Invalid=1375, Unknown=0, NotChecked=0, Total=1806 [2018-07-24 14:30:16,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6316 states. [2018-07-24 14:30:16,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6316 to 6046. [2018-07-24 14:30:16,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6046 states. [2018-07-24 14:30:16,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6046 states to 6046 states and 7441 transitions. [2018-07-24 14:30:16,311 INFO L78 Accepts]: Start accepts. Automaton has 6046 states and 7441 transitions. Word has length 330 [2018-07-24 14:30:16,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:30:16,311 INFO L471 AbstractCegarLoop]: Abstraction has 6046 states and 7441 transitions. [2018-07-24 14:30:16,311 INFO L472 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-07-24 14:30:16,311 INFO L276 IsEmpty]: Start isEmpty. Operand 6046 states and 7441 transitions. [2018-07-24 14:30:16,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 356 [2018-07-24 14:30:16,330 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:30:16,331 INFO L353 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:30:16,331 INFO L414 AbstractCegarLoop]: === Iteration 7 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:30:16,331 INFO L82 PathProgramCache]: Analyzing trace with hash 507460510, now seen corresponding path program 1 times [2018-07-24 14:30:16,331 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:30:16,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:16,332 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:16,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:16,333 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:30:16,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:17,436 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 289 proven. 2 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-07-24 14:30:17,436 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:17,436 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 14:30:17,445 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:17,445 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:17,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:17,561 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:18,281 WARN L169 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 8 DAG size of output: 3 [2018-07-24 14:30:18,520 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 233 proven. 0 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2018-07-24 14:30:18,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:18,720 WARN L169 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-07-24 14:30:19,113 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 114 proven. 187 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2018-07-24 14:30:19,134 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-07-24 14:30:19,135 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [11, 5] total 15 [2018-07-24 14:30:19,135 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-24 14:30:19,135 INFO L450 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-07-24 14:30:19,136 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-07-24 14:30:19,136 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2018-07-24 14:30:19,137 INFO L87 Difference]: Start difference. First operand 6046 states and 7441 transitions. Second operand 5 states. [2018-07-24 14:30:21,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:30:21,417 INFO L93 Difference]: Finished difference Result 16837 states and 21282 transitions. [2018-07-24 14:30:21,418 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-07-24 14:30:21,418 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 355 [2018-07-24 14:30:21,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:30:21,483 INFO L225 Difference]: With dead ends: 16837 [2018-07-24 14:30:21,483 INFO L226 Difference]: Without dead ends: 10797 [2018-07-24 14:30:21,521 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 726 GetRequests, 704 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-07-24 14:30:21,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10797 states. [2018-07-24 14:30:21,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10797 to 10641. [2018-07-24 14:30:21,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10641 states. [2018-07-24 14:30:21,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10641 states to 10641 states and 13034 transitions. [2018-07-24 14:30:21,769 INFO L78 Accepts]: Start accepts. Automaton has 10641 states and 13034 transitions. Word has length 355 [2018-07-24 14:30:21,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:30:21,770 INFO L471 AbstractCegarLoop]: Abstraction has 10641 states and 13034 transitions. [2018-07-24 14:30:21,770 INFO L472 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-07-24 14:30:21,770 INFO L276 IsEmpty]: Start isEmpty. Operand 10641 states and 13034 transitions. [2018-07-24 14:30:21,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2018-07-24 14:30:21,800 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:30:21,800 INFO L353 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:30:21,800 INFO L414 AbstractCegarLoop]: === Iteration 8 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:30:21,801 INFO L82 PathProgramCache]: Analyzing trace with hash 994496646, now seen corresponding path program 1 times [2018-07-24 14:30:21,801 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:30:21,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:21,802 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:21,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:21,802 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:30:21,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:22,712 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 417 proven. 2 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-07-24 14:30:22,712 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:22,713 INFO L191 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 [2018-07-24 14:30:22,721 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:22,721 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:22,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:22,871 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:23,068 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 417 proven. 2 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-07-24 14:30:23,068 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:23,521 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 417 proven. 2 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-07-24 14:30:23,544 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:23,544 INFO L191 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 [2018-07-24 14:30:23,562 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:23,562 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:23,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:23,915 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:24,017 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 417 proven. 2 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-07-24 14:30:24,017 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:24,513 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 417 proven. 2 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2018-07-24 14:30:24,516 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:30:24,516 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5, 5, 5] total 12 [2018-07-24 14:30:24,516 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:30:24,517 INFO L450 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-07-24 14:30:24,517 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-07-24 14:30:24,517 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2018-07-24 14:30:24,518 INFO L87 Difference]: Start difference. First operand 10641 states and 13034 transitions. Second operand 10 states. [2018-07-24 14:30:29,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:30:29,109 INFO L93 Difference]: Finished difference Result 23312 states and 29397 transitions. [2018-07-24 14:30:29,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-07-24 14:30:29,111 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 466 [2018-07-24 14:30:29,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:30:29,154 INFO L225 Difference]: With dead ends: 23312 [2018-07-24 14:30:29,154 INFO L226 Difference]: Without dead ends: 12677 [2018-07-24 14:30:29,193 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 1899 GetRequests, 1868 SyntacticMatches, 8 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=187, Invalid=413, Unknown=0, NotChecked=0, Total=600 [2018-07-24 14:30:29,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12677 states. [2018-07-24 14:30:29,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12677 to 12350. [2018-07-24 14:30:29,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12350 states. [2018-07-24 14:30:29,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12350 states to 12350 states and 14454 transitions. [2018-07-24 14:30:29,416 INFO L78 Accepts]: Start accepts. Automaton has 12350 states and 14454 transitions. Word has length 466 [2018-07-24 14:30:29,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:30:29,417 INFO L471 AbstractCegarLoop]: Abstraction has 12350 states and 14454 transitions. [2018-07-24 14:30:29,417 INFO L472 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-07-24 14:30:29,417 INFO L276 IsEmpty]: Start isEmpty. Operand 12350 states and 14454 transitions. [2018-07-24 14:30:29,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 485 [2018-07-24 14:30:29,444 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:30:29,444 INFO L353 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:30:29,444 INFO L414 AbstractCegarLoop]: === Iteration 9 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:30:29,445 INFO L82 PathProgramCache]: Analyzing trace with hash -451084734, now seen corresponding path program 1 times [2018-07-24 14:30:29,445 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:30:29,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:29,446 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:29,446 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:29,446 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:30:29,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:29,825 WARN L169 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2018-07-24 14:30:30,326 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 279 proven. 411 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2018-07-24 14:30:30,326 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:30,326 INFO L191 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 [2018-07-24 14:30:30,334 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:30,334 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:30,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:30,490 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:30,706 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 596 proven. 2 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2018-07-24 14:30:30,706 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:31,324 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 384 proven. 86 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2018-07-24 14:30:31,344 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:31,344 INFO L191 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 [2018-07-24 14:30:31,360 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:31,360 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:31,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:31,715 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:32,223 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 590 proven. 8 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2018-07-24 14:30:32,224 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:33,012 INFO L134 CoverageAnalysis]: Checked inductivity of 744 backedges. 384 proven. 86 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2018-07-24 14:30:33,015 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:30:33,015 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5, 8, 5] total 24 [2018-07-24 14:30:33,015 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:30:33,017 INFO L450 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-07-24 14:30:33,018 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-07-24 14:30:33,018 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=459, Unknown=0, NotChecked=0, Total=552 [2018-07-24 14:30:33,018 INFO L87 Difference]: Start difference. First operand 12350 states and 14454 transitions. Second operand 14 states. [2018-07-24 14:30:39,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:30:39,675 INFO L93 Difference]: Finished difference Result 25639 states and 30865 transitions. [2018-07-24 14:30:39,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-07-24 14:30:39,675 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 484 [2018-07-24 14:30:39,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:30:39,713 INFO L225 Difference]: With dead ends: 25639 [2018-07-24 14:30:39,713 INFO L226 Difference]: Without dead ends: 13295 [2018-07-24 14:30:39,747 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 2001 GetRequests, 1948 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 609 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=466, Invalid=2084, Unknown=0, NotChecked=0, Total=2550 [2018-07-24 14:30:39,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13295 states. [2018-07-24 14:30:39,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13295 to 12761. [2018-07-24 14:30:39,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12761 states. [2018-07-24 14:30:39,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12761 states to 12761 states and 14356 transitions. [2018-07-24 14:30:39,964 INFO L78 Accepts]: Start accepts. Automaton has 12761 states and 14356 transitions. Word has length 484 [2018-07-24 14:30:39,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:30:39,964 INFO L471 AbstractCegarLoop]: Abstraction has 12761 states and 14356 transitions. [2018-07-24 14:30:39,965 INFO L472 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-07-24 14:30:39,965 INFO L276 IsEmpty]: Start isEmpty. Operand 12761 states and 14356 transitions. [2018-07-24 14:30:39,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2018-07-24 14:30:39,985 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:30:39,986 INFO L353 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:30:39,986 INFO L414 AbstractCegarLoop]: === Iteration 10 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:30:39,986 INFO L82 PathProgramCache]: Analyzing trace with hash -2137915696, now seen corresponding path program 1 times [2018-07-24 14:30:39,987 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:30:39,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:39,988 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:39,988 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:39,988 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:30:40,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:40,522 WARN L169 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-07-24 14:30:40,732 WARN L169 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-07-24 14:30:40,960 WARN L169 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-07-24 14:30:41,379 WARN L169 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2018-07-24 14:30:42,481 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 521 proven. 433 refuted. 0 times theorem prover too weak. 168 trivial. 0 not checked. [2018-07-24 14:30:42,481 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:42,481 INFO L191 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 [2018-07-24 14:30:42,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:42,489 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:42,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:42,676 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:43,304 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 807 proven. 2 refuted. 0 times theorem prover too weak. 313 trivial. 0 not checked. [2018-07-24 14:30:43,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:43,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 515 proven. 86 refuted. 0 times theorem prover too weak. 521 trivial. 0 not checked. [2018-07-24 14:30:43,949 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:43,949 INFO L191 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 [2018-07-24 14:30:43,968 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:43,968 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:30:44,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:44,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:44,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 599 proven. 210 refuted. 0 times theorem prover too weak. 313 trivial. 0 not checked. [2018-07-24 14:30:44,910 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:45,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 226 proven. 617 refuted. 0 times theorem prover too weak. 279 trivial. 0 not checked. [2018-07-24 14:30:45,928 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:30:45,929 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 5, 5, 8, 8] total 16 [2018-07-24 14:30:45,929 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:30:45,930 INFO L450 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-07-24 14:30:45,930 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-07-24 14:30:45,930 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2018-07-24 14:30:45,930 INFO L87 Difference]: Start difference. First operand 12761 states and 14356 transitions. Second operand 13 states. [2018-07-24 14:30:46,535 WARN L169 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 32 [2018-07-24 14:30:47,250 WARN L169 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 32 [2018-07-24 14:30:49,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:30:49,121 INFO L93 Difference]: Finished difference Result 25421 states and 29276 transitions. [2018-07-24 14:30:49,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-07-24 14:30:49,121 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 569 [2018-07-24 14:30:49,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:30:49,166 INFO L225 Difference]: With dead ends: 25421 [2018-07-24 14:30:49,166 INFO L226 Difference]: Without dead ends: 12813 [2018-07-24 14:30:49,188 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 2306 GetRequests, 2265 SyntacticMatches, 17 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=183, Invalid=467, Unknown=0, NotChecked=0, Total=650 [2018-07-24 14:30:49,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12813 states. [2018-07-24 14:30:49,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12813 to 12257. [2018-07-24 14:30:49,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12257 states. [2018-07-24 14:30:49,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12257 states to 12257 states and 13326 transitions. [2018-07-24 14:30:49,392 INFO L78 Accepts]: Start accepts. Automaton has 12257 states and 13326 transitions. Word has length 569 [2018-07-24 14:30:49,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:30:49,393 INFO L471 AbstractCegarLoop]: Abstraction has 12257 states and 13326 transitions. [2018-07-24 14:30:49,393 INFO L472 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-07-24 14:30:49,393 INFO L276 IsEmpty]: Start isEmpty. Operand 12257 states and 13326 transitions. [2018-07-24 14:30:49,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2018-07-24 14:30:49,418 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:30:49,418 INFO L353 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:30:49,419 INFO L414 AbstractCegarLoop]: === Iteration 11 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:30:49,419 INFO L82 PathProgramCache]: Analyzing trace with hash -763775452, now seen corresponding path program 2 times [2018-07-24 14:30:49,419 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:30:49,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:49,420 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:30:49,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:30:49,420 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:30:49,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:30:50,082 WARN L169 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-07-24 14:30:51,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 547 proven. 461 refuted. 0 times theorem prover too weak. 193 trivial. 0 not checked. [2018-07-24 14:30:51,612 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:51,612 INFO L191 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 [2018-07-24 14:30:51,619 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-24 14:30:51,620 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-24 14:30:51,818 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-24 14:30:51,819 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 14:30:51,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:52,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 835 proven. 2 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-07-24 14:30:52,444 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:52,693 WARN L169 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 37 [2018-07-24 14:30:53,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 541 proven. 86 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2018-07-24 14:30:53,582 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:30:53,582 INFO L191 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 [2018-07-24 14:30:53,598 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-24 14:30:53,598 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-24 14:30:54,040 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-24 14:30:54,041 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-24 14:30:54,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:30:54,940 WARN L169 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 35 [2018-07-24 14:30:56,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 829 proven. 8 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-07-24 14:30:56,164 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:30:56,572 WARN L169 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 25 [2018-07-24 14:30:58,887 INFO L134 CoverageAnalysis]: Checked inductivity of 1201 backedges. 220 proven. 651 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-07-24 14:30:58,889 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:30:58,890 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5, 5, 11, 11] total 32 [2018-07-24 14:30:58,890 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:30:58,891 INFO L450 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-07-24 14:30:58,891 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-07-24 14:30:58,891 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=833, Unknown=0, NotChecked=0, Total=992 [2018-07-24 14:30:58,892 INFO L87 Difference]: Start difference. First operand 12257 states and 13326 transitions. Second operand 18 states. [2018-07-24 14:31:01,110 WARN L169 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2018-07-24 14:31:03,205 WARN L169 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 45 [2018-07-24 14:31:03,481 WARN L169 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 48 [2018-07-24 14:31:03,681 WARN L169 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 52 [2018-07-24 14:31:05,189 WARN L169 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 43 [2018-07-24 14:31:05,454 WARN L169 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 46 [2018-07-24 14:31:05,661 WARN L169 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 41 [2018-07-24 14:31:06,201 WARN L169 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 49 [2018-07-24 14:31:07,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:31:07,555 INFO L93 Difference]: Finished difference Result 24403 states and 26695 transitions. [2018-07-24 14:31:07,555 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-07-24 14:31:07,556 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 595 [2018-07-24 14:31:07,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:31:07,584 INFO L225 Difference]: With dead ends: 24403 [2018-07-24 14:31:07,584 INFO L226 Difference]: Without dead ends: 12520 [2018-07-24 14:31:07,603 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 2453 GetRequests, 2374 SyntacticMatches, 15 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1148 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=783, Invalid=3507, Unknown=0, NotChecked=0, Total=4290 [2018-07-24 14:31:07,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12520 states. [2018-07-24 14:31:07,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12520 to 11432. [2018-07-24 14:31:07,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11432 states. [2018-07-24 14:31:07,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11432 states to 11432 states and 12342 transitions. [2018-07-24 14:31:07,783 INFO L78 Accepts]: Start accepts. Automaton has 11432 states and 12342 transitions. Word has length 595 [2018-07-24 14:31:07,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:31:07,784 INFO L471 AbstractCegarLoop]: Abstraction has 11432 states and 12342 transitions. [2018-07-24 14:31:07,784 INFO L472 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-07-24 14:31:07,784 INFO L276 IsEmpty]: Start isEmpty. Operand 11432 states and 12342 transitions. [2018-07-24 14:31:07,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 652 [2018-07-24 14:31:07,798 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:31:07,799 INFO L353 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:31:07,799 INFO L414 AbstractCegarLoop]: === Iteration 12 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:31:07,800 INFO L82 PathProgramCache]: Analyzing trace with hash -911014918, now seen corresponding path program 1 times [2018-07-24 14:31:07,800 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:31:07,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:07,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-24 14:31:07,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:07,801 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:31:07,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:08,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1208 backedges. 548 proven. 86 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2018-07-24 14:31:08,470 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:08,470 INFO L191 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 [2018-07-24 14:31:08,478 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:08,479 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:08,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:08,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:08,988 INFO L134 CoverageAnalysis]: Checked inductivity of 1208 backedges. 842 proven. 2 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-07-24 14:31:08,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:09,353 INFO L134 CoverageAnalysis]: Checked inductivity of 1208 backedges. 548 proven. 86 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2018-07-24 14:31:09,374 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:09,374 INFO L191 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 [2018-07-24 14:31:09,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:09,393 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:09,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:09,843 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:10,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1208 backedges. 842 proven. 2 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2018-07-24 14:31:10,042 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:10,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1208 backedges. 548 proven. 86 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2018-07-24 14:31:10,391 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:31:10,392 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5, 5, 5] total 9 [2018-07-24 14:31:10,392 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:31:10,393 INFO L450 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-07-24 14:31:10,393 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-07-24 14:31:10,393 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-07-24 14:31:10,393 INFO L87 Difference]: Start difference. First operand 11432 states and 12342 transitions. Second operand 7 states. [2018-07-24 14:31:14,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:31:14,810 INFO L93 Difference]: Finished difference Result 29919 states and 34815 transitions. [2018-07-24 14:31:14,811 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-07-24 14:31:14,811 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 651 [2018-07-24 14:31:14,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:31:14,871 INFO L225 Difference]: With dead ends: 29919 [2018-07-24 14:31:14,871 INFO L226 Difference]: Without dead ends: 18678 [2018-07-24 14:31:14,907 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 2620 GetRequests, 2605 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2018-07-24 14:31:14,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18678 states. [2018-07-24 14:31:15,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18678 to 18251. [2018-07-24 14:31:15,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18251 states. [2018-07-24 14:31:15,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18251 states to 18251 states and 19979 transitions. [2018-07-24 14:31:15,243 INFO L78 Accepts]: Start accepts. Automaton has 18251 states and 19979 transitions. Word has length 651 [2018-07-24 14:31:15,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:31:15,245 INFO L471 AbstractCegarLoop]: Abstraction has 18251 states and 19979 transitions. [2018-07-24 14:31:15,245 INFO L472 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-07-24 14:31:15,245 INFO L276 IsEmpty]: Start isEmpty. Operand 18251 states and 19979 transitions. [2018-07-24 14:31:15,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 759 [2018-07-24 14:31:15,263 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:31:15,264 INFO L353 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:31:15,264 INFO L414 AbstractCegarLoop]: === Iteration 13 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:31:15,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1743403411, now seen corresponding path program 1 times [2018-07-24 14:31:15,265 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:31:15,265 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:15,265 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:15,266 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:15,266 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:31:15,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:17,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2138 backedges. 803 proven. 760 refuted. 0 times theorem prover too weak. 575 trivial. 0 not checked. [2018-07-24 14:31:17,109 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:17,109 INFO L191 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 [2018-07-24 14:31:17,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:17,119 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:17,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:17,353 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:17,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2138 backedges. 1236 proven. 2 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2018-07-24 14:31:17,770 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:17,941 WARN L169 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 35 [2018-07-24 14:31:19,066 INFO L134 CoverageAnalysis]: Checked inductivity of 2138 backedges. 796 proven. 86 refuted. 0 times theorem prover too weak. 1256 trivial. 0 not checked. [2018-07-24 14:31:19,087 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:19,087 INFO L191 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 [2018-07-24 14:31:19,111 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:19,112 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:19,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:19,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:20,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2138 backedges. 1228 proven. 10 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2018-07-24 14:31:20,237 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:22,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2138 backedges. 296 proven. 976 refuted. 0 times theorem prover too weak. 866 trivial. 0 not checked. [2018-07-24 14:31:22,028 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:31:22,028 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5, 5, 8, 8] total 28 [2018-07-24 14:31:22,028 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:31:22,029 INFO L450 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-07-24 14:31:22,030 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-07-24 14:31:22,030 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=618, Unknown=0, NotChecked=0, Total=756 [2018-07-24 14:31:22,030 INFO L87 Difference]: Start difference. First operand 18251 states and 19979 transitions. Second operand 17 states. [2018-07-24 14:31:30,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:31:30,390 INFO L93 Difference]: Finished difference Result 36476 states and 41056 transitions. [2018-07-24 14:31:30,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-07-24 14:31:30,390 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 758 [2018-07-24 14:31:30,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:31:30,445 INFO L225 Difference]: With dead ends: 36476 [2018-07-24 14:31:30,445 INFO L226 Difference]: Without dead ends: 17520 [2018-07-24 14:31:30,488 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 3115 GetRequests, 3037 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1433 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1098, Invalid=4014, Unknown=0, NotChecked=0, Total=5112 [2018-07-24 14:31:30,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17520 states. [2018-07-24 14:31:30,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17520 to 17071. [2018-07-24 14:31:30,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17071 states. [2018-07-24 14:31:30,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17071 states to 17071 states and 18378 transitions. [2018-07-24 14:31:30,795 INFO L78 Accepts]: Start accepts. Automaton has 17071 states and 18378 transitions. Word has length 758 [2018-07-24 14:31:30,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:31:30,796 INFO L471 AbstractCegarLoop]: Abstraction has 17071 states and 18378 transitions. [2018-07-24 14:31:30,796 INFO L472 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-07-24 14:31:30,796 INFO L276 IsEmpty]: Start isEmpty. Operand 17071 states and 18378 transitions. [2018-07-24 14:31:30,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 812 [2018-07-24 14:31:30,806 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:31:30,807 INFO L353 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:31:30,807 INFO L414 AbstractCegarLoop]: === Iteration 14 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:31:30,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1525853035, now seen corresponding path program 1 times [2018-07-24 14:31:30,808 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:31:30,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:30,808 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:30,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:30,809 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:31:30,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:31,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 754 proven. 86 refuted. 0 times theorem prover too weak. 992 trivial. 0 not checked. [2018-07-24 14:31:31,901 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:31,901 INFO L191 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 [2018-07-24 14:31:31,910 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:31,910 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:32,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:32,164 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:32,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 1130 proven. 2 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2018-07-24 14:31:32,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:32,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 754 proven. 86 refuted. 0 times theorem prover too weak. 992 trivial. 0 not checked. [2018-07-24 14:31:32,988 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:32,988 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 14:31:33,003 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:33,003 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:33,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:33,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:33,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 1130 proven. 2 refuted. 0 times theorem prover too weak. 700 trivial. 0 not checked. [2018-07-24 14:31:33,923 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:34,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1832 backedges. 754 proven. 86 refuted. 0 times theorem prover too weak. 992 trivial. 0 not checked. [2018-07-24 14:31:34,384 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:31:34,385 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5, 5, 5] total 9 [2018-07-24 14:31:34,385 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:31:34,387 INFO L450 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-07-24 14:31:34,387 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-07-24 14:31:34,387 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-07-24 14:31:34,387 INFO L87 Difference]: Start difference. First operand 17071 states and 18378 transitions. Second operand 7 states. [2018-07-24 14:31:36,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:31:36,326 INFO L93 Difference]: Finished difference Result 34719 states and 37487 transitions. [2018-07-24 14:31:36,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-07-24 14:31:36,327 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 811 [2018-07-24 14:31:36,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:31:36,355 INFO L225 Difference]: With dead ends: 34719 [2018-07-24 14:31:36,355 INFO L226 Difference]: Without dead ends: 17839 [2018-07-24 14:31:36,379 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 3260 GetRequests, 3245 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2018-07-24 14:31:36,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17839 states. [2018-07-24 14:31:36,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17839 to 17279. [2018-07-24 14:31:36,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17279 states. [2018-07-24 14:31:36,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17279 states to 17279 states and 18514 transitions. [2018-07-24 14:31:36,628 INFO L78 Accepts]: Start accepts. Automaton has 17279 states and 18514 transitions. Word has length 811 [2018-07-24 14:31:36,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:31:36,629 INFO L471 AbstractCegarLoop]: Abstraction has 17279 states and 18514 transitions. [2018-07-24 14:31:36,629 INFO L472 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-07-24 14:31:36,629 INFO L276 IsEmpty]: Start isEmpty. Operand 17279 states and 18514 transitions. [2018-07-24 14:31:36,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 868 [2018-07-24 14:31:36,640 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:31:36,641 INFO L353 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:31:36,641 INFO L414 AbstractCegarLoop]: === Iteration 15 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:31:36,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1905625708, now seen corresponding path program 1 times [2018-07-24 14:31:36,642 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:31:36,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:36,642 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:36,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:36,643 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:31:36,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:38,760 INFO L134 CoverageAnalysis]: Checked inductivity of 2336 backedges. 840 proven. 833 refuted. 0 times theorem prover too weak. 663 trivial. 0 not checked. [2018-07-24 14:31:38,760 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:38,761 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 14:31:38,768 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:38,768 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:39,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:39,037 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:39,714 INFO L134 CoverageAnalysis]: Checked inductivity of 2336 backedges. 1309 proven. 2 refuted. 0 times theorem prover too weak. 1025 trivial. 0 not checked. [2018-07-24 14:31:39,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:40,495 INFO L134 CoverageAnalysis]: Checked inductivity of 2336 backedges. 856 proven. 86 refuted. 0 times theorem prover too weak. 1394 trivial. 0 not checked. [2018-07-24 14:31:40,516 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:40,516 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 14:31:40,536 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:40,536 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:41,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:41,154 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:41,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2336 backedges. 1304 proven. 25 refuted. 0 times theorem prover too weak. 1007 trivial. 0 not checked. [2018-07-24 14:31:41,462 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:42,431 INFO L134 CoverageAnalysis]: Checked inductivity of 2336 backedges. 856 proven. 86 refuted. 0 times theorem prover too weak. 1394 trivial. 0 not checked. [2018-07-24 14:31:42,434 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:31:42,434 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 5, 5] total 22 [2018-07-24 14:31:42,435 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:31:42,436 INFO L450 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-07-24 14:31:42,436 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-07-24 14:31:42,436 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-07-24 14:31:42,437 INFO L87 Difference]: Start difference. First operand 17279 states and 18514 transitions. Second operand 17 states. [2018-07-24 14:31:46,363 WARN L169 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 45 [2018-07-24 14:31:47,458 WARN L169 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 54 [2018-07-24 14:31:48,844 WARN L169 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 40 [2018-07-24 14:31:52,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:31:52,360 INFO L93 Difference]: Finished difference Result 35104 states and 38552 transitions. [2018-07-24 14:31:52,360 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2018-07-24 14:31:52,361 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 867 [2018-07-24 14:31:52,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:31:52,410 INFO L225 Difference]: With dead ends: 35104 [2018-07-24 14:31:52,410 INFO L226 Difference]: Without dead ends: 18016 [2018-07-24 14:31:52,436 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 3556 GetRequests, 3493 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1068 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=917, Invalid=3243, Unknown=0, NotChecked=0, Total=4160 [2018-07-24 14:31:52,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18016 states. [2018-07-24 14:31:52,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18016 to 17381. [2018-07-24 14:31:52,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17381 states. [2018-07-24 14:31:52,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17381 states to 17381 states and 18471 transitions. [2018-07-24 14:31:52,692 INFO L78 Accepts]: Start accepts. Automaton has 17381 states and 18471 transitions. Word has length 867 [2018-07-24 14:31:52,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:31:52,693 INFO L471 AbstractCegarLoop]: Abstraction has 17381 states and 18471 transitions. [2018-07-24 14:31:52,693 INFO L472 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-07-24 14:31:52,693 INFO L276 IsEmpty]: Start isEmpty. Operand 17381 states and 18471 transitions. [2018-07-24 14:31:52,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 889 [2018-07-24 14:31:52,701 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:31:52,702 INFO L353 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:31:52,702 INFO L414 AbstractCegarLoop]: === Iteration 16 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:31:52,702 INFO L82 PathProgramCache]: Analyzing trace with hash 2013432513, now seen corresponding path program 1 times [2018-07-24 14:31:52,702 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:31:52,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:52,703 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:52,703 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:52,703 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:31:52,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:53,766 INFO L134 CoverageAnalysis]: Checked inductivity of 2332 backedges. 621 proven. 150 refuted. 0 times theorem prover too weak. 1561 trivial. 0 not checked. [2018-07-24 14:31:53,766 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:53,767 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 14:31:53,782 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:53,782 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:54,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:54,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:54,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2332 backedges. 1504 proven. 2 refuted. 0 times theorem prover too weak. 826 trivial. 0 not checked. [2018-07-24 14:31:54,400 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:54,798 INFO L134 CoverageAnalysis]: Checked inductivity of 2332 backedges. 621 proven. 150 refuted. 0 times theorem prover too weak. 1561 trivial. 0 not checked. [2018-07-24 14:31:54,836 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:31:54,836 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 14:31:54,863 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:54,863 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:31:55,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:31:55,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:31:55,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2332 backedges. 1504 proven. 2 refuted. 0 times theorem prover too weak. 826 trivial. 0 not checked. [2018-07-24 14:31:55,840 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:31:56,248 INFO L134 CoverageAnalysis]: Checked inductivity of 2332 backedges. 621 proven. 150 refuted. 0 times theorem prover too weak. 1561 trivial. 0 not checked. [2018-07-24 14:31:56,250 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:31:56,251 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5, 5, 5] total 11 [2018-07-24 14:31:56,251 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:31:56,253 INFO L450 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-07-24 14:31:56,253 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-07-24 14:31:56,253 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2018-07-24 14:31:56,253 INFO L87 Difference]: Start difference. First operand 17381 states and 18471 transitions. Second operand 10 states. [2018-07-24 14:31:59,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:31:59,599 INFO L93 Difference]: Finished difference Result 32733 states and 34865 transitions. [2018-07-24 14:31:59,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-07-24 14:31:59,599 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 888 [2018-07-24 14:31:59,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:31:59,625 INFO L225 Difference]: With dead ends: 32733 [2018-07-24 14:31:59,626 INFO L226 Difference]: Without dead ends: 15543 [2018-07-24 14:31:59,649 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 3584 GetRequests, 3553 SyntacticMatches, 9 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=165, Invalid=387, Unknown=0, NotChecked=0, Total=552 [2018-07-24 14:31:59,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15543 states. [2018-07-24 14:31:59,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15543 to 15253. [2018-07-24 14:31:59,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15253 states. [2018-07-24 14:31:59,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15253 states to 15253 states and 15913 transitions. [2018-07-24 14:31:59,829 INFO L78 Accepts]: Start accepts. Automaton has 15253 states and 15913 transitions. Word has length 888 [2018-07-24 14:31:59,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:31:59,829 INFO L471 AbstractCegarLoop]: Abstraction has 15253 states and 15913 transitions. [2018-07-24 14:31:59,829 INFO L472 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-07-24 14:31:59,829 INFO L276 IsEmpty]: Start isEmpty. Operand 15253 states and 15913 transitions. [2018-07-24 14:31:59,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 989 [2018-07-24 14:31:59,838 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:31:59,838 INFO L353 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:31:59,838 INFO L414 AbstractCegarLoop]: === Iteration 17 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:31:59,839 INFO L82 PathProgramCache]: Analyzing trace with hash 1086786040, now seen corresponding path program 1 times [2018-07-24 14:31:59,839 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:31:59,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:59,840 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:31:59,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:31:59,840 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:31:59,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:32:01,466 INFO L134 CoverageAnalysis]: Checked inductivity of 2957 backedges. 1503 proven. 6 refuted. 0 times theorem prover too weak. 1448 trivial. 0 not checked. [2018-07-24 14:32:01,466 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:32:01,466 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 14:32:01,482 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:32:01,483 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:32:01,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:32:01,769 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:32:02,263 INFO L134 CoverageAnalysis]: Checked inductivity of 2957 backedges. 1503 proven. 6 refuted. 0 times theorem prover too weak. 1448 trivial. 0 not checked. [2018-07-24 14:32:02,264 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:32:03,130 INFO L134 CoverageAnalysis]: Checked inductivity of 2957 backedges. 1503 proven. 86 refuted. 0 times theorem prover too weak. 1368 trivial. 0 not checked. [2018-07-24 14:32:03,160 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:32:03,161 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 14:32:03,184 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:32:03,184 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:32:03,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:32:03,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:32:04,285 INFO L134 CoverageAnalysis]: Checked inductivity of 2957 backedges. 1503 proven. 6 refuted. 0 times theorem prover too weak. 1448 trivial. 0 not checked. [2018-07-24 14:32:04,285 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:32:05,957 INFO L134 CoverageAnalysis]: Checked inductivity of 2957 backedges. 1503 proven. 86 refuted. 0 times theorem prover too weak. 1368 trivial. 0 not checked. [2018-07-24 14:32:05,962 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:32:05,964 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8, 7, 8] total 13 [2018-07-24 14:32:05,964 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:32:05,965 INFO L450 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-07-24 14:32:05,966 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-07-24 14:32:05,966 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2018-07-24 14:32:05,966 INFO L87 Difference]: Start difference. First operand 15253 states and 15913 transitions. Second operand 8 states. [2018-07-24 14:32:11,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:32:11,500 INFO L93 Difference]: Finished difference Result 32646 states and 34124 transitions. [2018-07-24 14:32:11,500 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-07-24 14:32:11,500 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 988 [2018-07-24 14:32:11,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:32:11,529 INFO L225 Difference]: With dead ends: 32646 [2018-07-24 14:32:11,530 INFO L226 Difference]: Without dead ends: 17584 [2018-07-24 14:32:11,548 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 3976 GetRequests, 3952 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-07-24 14:32:11,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17584 states. [2018-07-24 14:32:11,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17584 to 16132. [2018-07-24 14:32:11,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16132 states. [2018-07-24 14:32:11,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16132 states to 16132 states and 16834 transitions. [2018-07-24 14:32:11,733 INFO L78 Accepts]: Start accepts. Automaton has 16132 states and 16834 transitions. Word has length 988 [2018-07-24 14:32:11,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:32:11,734 INFO L471 AbstractCegarLoop]: Abstraction has 16132 states and 16834 transitions. [2018-07-24 14:32:11,734 INFO L472 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-07-24 14:32:11,734 INFO L276 IsEmpty]: Start isEmpty. Operand 16132 states and 16834 transitions. [2018-07-24 14:32:11,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1563 [2018-07-24 14:32:11,752 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:32:11,753 INFO L353 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:32:11,753 INFO L414 AbstractCegarLoop]: === Iteration 18 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:32:11,754 INFO L82 PathProgramCache]: Analyzing trace with hash 778793236, now seen corresponding path program 1 times [2018-07-24 14:32:11,754 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:32:11,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:32:11,755 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:32:11,755 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:32:11,755 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:32:11,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:32:16,134 INFO L134 CoverageAnalysis]: Checked inductivity of 7349 backedges. 1600 proven. 4208 refuted. 0 times theorem prover too weak. 1541 trivial. 0 not checked. [2018-07-24 14:32:16,134 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:32:16,135 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 14:32:16,144 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:32:16,145 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:32:16,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:32:16,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:32:17,828 INFO L134 CoverageAnalysis]: Checked inductivity of 7349 backedges. 2525 proven. 2 refuted. 0 times theorem prover too weak. 4822 trivial. 0 not checked. [2018-07-24 14:32:17,828 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:32:20,561 INFO L134 CoverageAnalysis]: Checked inductivity of 7349 backedges. 1672 proven. 86 refuted. 0 times theorem prover too weak. 5591 trivial. 0 not checked. [2018-07-24 14:32:20,582 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:32:20,583 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 14:32:20,598 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:32:20,599 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:32:21,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:32:21,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:32:23,653 INFO L134 CoverageAnalysis]: Checked inductivity of 7349 backedges. 2507 proven. 20 refuted. 0 times theorem prover too weak. 4822 trivial. 0 not checked. [2018-07-24 14:32:23,653 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:32:29,986 INFO L134 CoverageAnalysis]: Checked inductivity of 7349 backedges. 583 proven. 1978 refuted. 0 times theorem prover too weak. 4788 trivial. 0 not checked. [2018-07-24 14:32:29,989 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:32:29,991 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 5, 5, 8, 8] total 35 [2018-07-24 14:32:29,991 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:32:29,993 INFO L450 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-07-24 14:32:29,993 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-07-24 14:32:29,994 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1057, Unknown=0, NotChecked=0, Total=1190 [2018-07-24 14:32:29,994 INFO L87 Difference]: Start difference. First operand 16132 states and 16834 transitions. Second operand 24 states. [2018-07-24 14:32:57,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:32:57,900 INFO L93 Difference]: Finished difference Result 34682 states and 39235 transitions. [2018-07-24 14:32:57,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2018-07-24 14:32:57,901 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 1562 [2018-07-24 14:32:57,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:32:57,967 INFO L225 Difference]: With dead ends: 34682 [2018-07-24 14:32:57,967 INFO L226 Difference]: Without dead ends: 18741 [2018-07-24 14:32:57,998 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 6452 GetRequests, 6280 SyntacticMatches, 14 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9084 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=3973, Invalid=21467, Unknown=0, NotChecked=0, Total=25440 [2018-07-24 14:32:58,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18741 states. [2018-07-24 14:32:58,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18741 to 16150. [2018-07-24 14:32:58,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16150 states. [2018-07-24 14:32:58,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16150 states to 16150 states and 16957 transitions. [2018-07-24 14:32:58,328 INFO L78 Accepts]: Start accepts. Automaton has 16150 states and 16957 transitions. Word has length 1562 [2018-07-24 14:32:58,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:32:58,329 INFO L471 AbstractCegarLoop]: Abstraction has 16150 states and 16957 transitions. [2018-07-24 14:32:58,329 INFO L472 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-07-24 14:32:58,329 INFO L276 IsEmpty]: Start isEmpty. Operand 16150 states and 16957 transitions. [2018-07-24 14:32:58,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1724 [2018-07-24 14:32:58,356 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:32:58,357 INFO L353 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 8, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:32:58,358 INFO L414 AbstractCegarLoop]: === Iteration 19 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:32:58,358 INFO L82 PathProgramCache]: Analyzing trace with hash -694926188, now seen corresponding path program 1 times [2018-07-24 14:32:58,358 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:32:58,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:32:58,359 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:32:58,359 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:32:58,359 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:32:58,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:32:59,295 WARN L169 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2018-07-24 14:33:01,219 INFO L134 CoverageAnalysis]: Checked inductivity of 8793 backedges. 1964 proven. 338 refuted. 0 times theorem prover too weak. 6491 trivial. 0 not checked. [2018-07-24 14:33:01,219 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:33:01,219 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 14:33:01,226 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:33:01,226 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:33:01,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:33:01,753 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:33:03,018 INFO L134 CoverageAnalysis]: Checked inductivity of 8793 backedges. 2920 proven. 2 refuted. 0 times theorem prover too weak. 5871 trivial. 0 not checked. [2018-07-24 14:33:03,018 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:33:04,372 INFO L134 CoverageAnalysis]: Checked inductivity of 8793 backedges. 1985 proven. 86 refuted. 0 times theorem prover too weak. 6722 trivial. 0 not checked. [2018-07-24 14:33:04,392 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:33:04,393 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 14:33:04,407 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:33:04,408 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:33:05,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:33:05,589 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:33:06,770 INFO L134 CoverageAnalysis]: Checked inductivity of 8793 backedges. 2920 proven. 2 refuted. 0 times theorem prover too weak. 5871 trivial. 0 not checked. [2018-07-24 14:33:06,770 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:33:08,275 INFO L134 CoverageAnalysis]: Checked inductivity of 8793 backedges. 1985 proven. 86 refuted. 0 times theorem prover too weak. 6722 trivial. 0 not checked. [2018-07-24 14:33:08,278 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-24 14:33:08,280 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5, 5, 5] total 12 [2018-07-24 14:33:08,280 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-24 14:33:08,281 INFO L450 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-07-24 14:33:08,282 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-07-24 14:33:08,282 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-07-24 14:33:08,282 INFO L87 Difference]: Start difference. First operand 16150 states and 16957 transitions. Second operand 11 states. [2018-07-24 14:33:12,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-24 14:33:12,370 INFO L93 Difference]: Finished difference Result 31973 states and 33605 transitions. [2018-07-24 14:33:12,371 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-07-24 14:33:12,371 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 1723 [2018-07-24 14:33:12,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-24 14:33:12,381 INFO L225 Difference]: With dead ends: 31973 [2018-07-24 14:33:12,381 INFO L226 Difference]: Without dead ends: 5788 [2018-07-24 14:33:12,403 INFO L573 BasicCegarLoop]: 0 DeclaredPredicates, 6933 GetRequests, 6897 SyntacticMatches, 7 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=250, Invalid=680, Unknown=0, NotChecked=0, Total=930 [2018-07-24 14:33:12,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5788 states. [2018-07-24 14:33:12,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5788 to 4996. [2018-07-24 14:33:12,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4996 states. [2018-07-24 14:33:12,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4996 states to 4996 states and 5132 transitions. [2018-07-24 14:33:12,496 INFO L78 Accepts]: Start accepts. Automaton has 4996 states and 5132 transitions. Word has length 1723 [2018-07-24 14:33:12,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-24 14:33:12,497 INFO L471 AbstractCegarLoop]: Abstraction has 4996 states and 5132 transitions. [2018-07-24 14:33:12,497 INFO L472 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-07-24 14:33:12,497 INFO L276 IsEmpty]: Start isEmpty. Operand 4996 states and 5132 transitions. [2018-07-24 14:33:12,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1782 [2018-07-24 14:33:12,518 INFO L345 BasicCegarLoop]: Found error trace [2018-07-24 14:33:12,519 INFO L353 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 8, 8, 8, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-24 14:33:12,519 INFO L414 AbstractCegarLoop]: === Iteration 20 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_eca_rers_____Problem___label___true_unreach_call_false_termination_c__calculate_outputErr0AssertViolationERROR_FUNCTION]=== [2018-07-24 14:33:12,520 INFO L82 PathProgramCache]: Analyzing trace with hash -986171757, now seen corresponding path program 1 times [2018-07-24 14:33:12,520 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-07-24 14:33:12,520 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:33:12,520 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:33:12,521 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-24 14:33:12,521 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-24 14:33:12,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:33:13,897 WARN L169 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-07-24 14:33:14,115 WARN L169 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-07-24 14:33:14,338 WARN L169 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2018-07-24 14:33:14,643 WARN L169 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2018-07-24 14:33:18,673 INFO L134 CoverageAnalysis]: Checked inductivity of 9986 backedges. 1927 proven. 2167 refuted. 0 times theorem prover too weak. 5892 trivial. 0 not checked. [2018-07-24 14:33:18,673 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:33:18,673 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-24 14:33:18,682 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:33:18,682 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:33:19,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:33:19,221 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:33:20,660 INFO L134 CoverageAnalysis]: Checked inductivity of 9986 backedges. 3994 proven. 6 refuted. 0 times theorem prover too weak. 5986 trivial. 0 not checked. [2018-07-24 14:33:20,660 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-24 14:33:20,829 WARN L169 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 32 [2018-07-24 14:33:23,390 INFO L134 CoverageAnalysis]: Checked inductivity of 9986 backedges. 2979 proven. 170 refuted. 0 times theorem prover too weak. 6837 trivial. 0 not checked. [2018-07-24 14:33:23,412 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-24 14:33:23,412 INFO L191 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-24 14:33:23,428 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-24 14:33:23,428 INFO L288 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-24 14:33:24,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-24 14:33:24,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-24 14:33:28,218 INFO L134 CoverageAnalysis]: Checked inductivity of 9986 backedges. 3041 proven. 1062 refuted. 0 times theorem prover too weak. 5883 trivial. 0 not checked. [2018-07-24 14:33:28,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown