./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loop-new/half_true-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0210da8c Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/TaipanReach.xml -i ../../../trunk/examples/svcomp/loop-new/half_true-unreach-call_true-termination.i -s /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UTaipan-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 14367fbcb63815bbc35abe1c5a8e938762f99ead .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-0210da8 [2018-10-21 12:39:05,228 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-21 12:39:05,230 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-21 12:39:05,248 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-21 12:39:05,249 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-21 12:39:05,251 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-21 12:39:05,255 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-21 12:39:05,257 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-21 12:39:05,268 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-21 12:39:05,269 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-21 12:39:05,270 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-21 12:39:05,270 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-21 12:39:05,271 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-21 12:39:05,272 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-21 12:39:05,273 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-21 12:39:05,274 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-21 12:39:05,275 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-21 12:39:05,277 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-21 12:39:05,280 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-21 12:39:05,281 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-21 12:39:05,282 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-21 12:39:05,283 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-21 12:39:05,286 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-21 12:39:05,286 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-21 12:39:05,287 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-21 12:39:05,287 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-21 12:39:05,289 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-21 12:39:05,290 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-21 12:39:05,290 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-21 12:39:05,292 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-21 12:39:05,292 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-21 12:39:05,293 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-21 12:39:05,294 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-21 12:39:05,294 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-21 12:39:05,295 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-21 12:39:05,296 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-21 12:39:05,296 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-21 12:39:05,313 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-21 12:39:05,313 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-21 12:39:05,314 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-21 12:39:05,314 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-21 12:39:05,315 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-21 12:39:05,315 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-21 12:39:05,316 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-21 12:39:05,316 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-21 12:39:05,316 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-21 12:39:05,316 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-21 12:39:05,316 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-21 12:39:05,317 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-21 12:39:05,317 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-21 12:39:05,319 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-21 12:39:05,319 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-21 12:39:05,319 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-21 12:39:05,319 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-21 12:39:05,320 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-21 12:39:05,320 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-21 12:39:05,320 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-21 12:39:05,320 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-21 12:39:05,320 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-21 12:39:05,321 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-21 12:39:05,322 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-21 12:39:05,322 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-21 12:39:05,322 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-21 12:39:05,323 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:39:05,324 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-21 12:39:05,324 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-21 12:39:05,325 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-21 12:39:05,325 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-21 12:39:05,325 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-21 12:39:05,325 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-21 12:39:05,325 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-21 12:39:05,326 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UTaipan-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 14367fbcb63815bbc35abe1c5a8e938762f99ead [2018-10-21 12:39:05,406 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-21 12:39:05,430 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-21 12:39:05,435 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-21 12:39:05,437 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-21 12:39:05,437 INFO L276 PluginConnector]: CDTParser initialized [2018-10-21 12:39:05,438 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-new/half_true-unreach-call_true-termination.i [2018-10-21 12:39:05,526 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/82bd5c1d0/7e8b35e003fc48c18bebf99cfa0b3ea2/FLAG8dc9d1629 [2018-10-21 12:39:05,997 INFO L298 CDTParser]: Found 1 translation units. [2018-10-21 12:39:06,000 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-new/half_true-unreach-call_true-termination.i [2018-10-21 12:39:06,007 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/82bd5c1d0/7e8b35e003fc48c18bebf99cfa0b3ea2/FLAG8dc9d1629 [2018-10-21 12:39:06,026 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/82bd5c1d0/7e8b35e003fc48c18bebf99cfa0b3ea2 [2018-10-21 12:39:06,030 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-21 12:39:06,033 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-21 12:39:06,034 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-21 12:39:06,034 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-21 12:39:06,039 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-21 12:39:06,039 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,042 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@237663f7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06, skipping insertion in model container [2018-10-21 12:39:06,043 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,054 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-21 12:39:06,078 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-21 12:39:06,326 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:39:06,330 INFO L189 MainTranslator]: Completed pre-run [2018-10-21 12:39:06,350 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:39:06,367 INFO L193 MainTranslator]: Completed translation [2018-10-21 12:39:06,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06 WrapperNode [2018-10-21 12:39:06,368 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-21 12:39:06,369 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-21 12:39:06,369 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-21 12:39:06,369 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-21 12:39:06,381 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,387 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,394 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-21 12:39:06,395 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-21 12:39:06,395 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-21 12:39:06,395 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-21 12:39:06,407 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,407 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,408 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,408 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,412 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,418 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,419 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... [2018-10-21 12:39:06,421 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-21 12:39:06,422 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-21 12:39:06,422 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-21 12:39:06,422 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-21 12:39:06,424 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:39:06,567 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-21 12:39:06,568 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-21 12:39:06,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-21 12:39:06,568 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-21 12:39:06,568 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-21 12:39:06,568 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-21 12:39:06,568 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-21 12:39:06,568 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-21 12:39:06,887 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-21 12:39:06,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:39:06 BoogieIcfgContainer [2018-10-21 12:39:06,890 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-21 12:39:06,891 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-21 12:39:06,891 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-21 12:39:06,900 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-21 12:39:06,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.10 12:39:06" (1/3) ... [2018-10-21 12:39:06,905 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70d7c042 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:39:06, skipping insertion in model container [2018-10-21 12:39:06,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:39:06" (2/3) ... [2018-10-21 12:39:06,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70d7c042 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:39:06, skipping insertion in model container [2018-10-21 12:39:06,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:39:06" (3/3) ... [2018-10-21 12:39:06,909 INFO L112 eAbstractionObserver]: Analyzing ICFG half_true-unreach-call_true-termination.i [2018-10-21 12:39:06,919 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-21 12:39:06,927 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-21 12:39:06,944 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-21 12:39:06,983 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-21 12:39:06,984 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-21 12:39:06,984 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-21 12:39:06,984 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-21 12:39:06,984 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-21 12:39:06,984 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-21 12:39:06,984 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-21 12:39:06,984 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-21 12:39:06,985 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-21 12:39:07,010 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-10-21 12:39:07,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-21 12:39:07,018 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:07,019 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:07,021 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:07,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:07,027 INFO L82 PathProgramCache]: Analyzing trace with hash 439143249, now seen corresponding path program 1 times [2018-10-21 12:39:07,030 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:07,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:07,075 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:07,075 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:07,075 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:07,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:07,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:07,154 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:39:07,154 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-21 12:39:07,154 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:39:07,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-21 12:39:07,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-21 12:39:07,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:39:07,179 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2018-10-21 12:39:07,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:07,203 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2018-10-21 12:39:07,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-21 12:39:07,205 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-10-21 12:39:07,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:07,215 INFO L225 Difference]: With dead ends: 34 [2018-10-21 12:39:07,215 INFO L226 Difference]: Without dead ends: 15 [2018-10-21 12:39:07,219 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:39:07,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2018-10-21 12:39:07,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-10-21 12:39:07,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-10-21 12:39:07,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-10-21 12:39:07,258 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-10-21 12:39:07,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:07,258 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-10-21 12:39:07,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-21 12:39:07,259 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-10-21 12:39:07,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-21 12:39:07,259 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:07,260 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:07,260 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:07,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:07,261 INFO L82 PathProgramCache]: Analyzing trace with hash 299545522, now seen corresponding path program 1 times [2018-10-21 12:39:07,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:07,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:07,262 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:07,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:07,263 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:07,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:07,556 WARN L179 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 12 [2018-10-21 12:39:07,681 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2018-10-21 12:39:07,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:07,892 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:39:07,892 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-10-21 12:39:07,892 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:39:07,894 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-21 12:39:07,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-21 12:39:07,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2018-10-21 12:39:07,898 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 7 states. [2018-10-21 12:39:08,115 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2018-10-21 12:39:08,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:08,275 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-10-21 12:39:08,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-21 12:39:08,276 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2018-10-21 12:39:08,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:08,280 INFO L225 Difference]: With dead ends: 29 [2018-10-21 12:39:08,280 INFO L226 Difference]: Without dead ends: 24 [2018-10-21 12:39:08,282 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-10-21 12:39:08,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-21 12:39:08,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 17. [2018-10-21 12:39:08,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-21 12:39:08,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-10-21 12:39:08,290 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2018-10-21 12:39:08,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:08,290 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-10-21 12:39:08,290 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-21 12:39:08,291 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-10-21 12:39:08,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-10-21 12:39:08,291 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:08,292 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:08,292 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:08,292 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:08,292 INFO L82 PathProgramCache]: Analyzing trace with hash 2077692347, now seen corresponding path program 1 times [2018-10-21 12:39:08,293 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:08,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:08,294 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:08,294 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:08,294 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:08,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:08,660 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:08,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:08,661 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:08,662 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 17 with the following transitions: [2018-10-21 12:39:08,664 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [20], [24], [31], [34], [36], [42], [43], [44], [46] [2018-10-21 12:39:08,716 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:39:08,717 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:39:08,878 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-21 12:39:08,947 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-21 12:39:08,948 INFO L272 AbstractInterpreter]: Visited 15 different actions 23 times. Merged at 4 different actions 4 times. Never widened. Found 1 fixpoints after 1 different actions. Largest state had 6 variables. [2018-10-21 12:39:08,961 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:08,962 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-21 12:39:08,963 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:08,963 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:08,972 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:08,972 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:39:08,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:08,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:09,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:09,218 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:09,733 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:09,755 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:09,755 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-21 12:39:09,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:09,774 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:39:09,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:09,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:09,850 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:09,851 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:09,909 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:09,916 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:09,917 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 5, 5, 5] total 16 [2018-10-21 12:39:09,917 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:09,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-21 12:39:09,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-21 12:39:09,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2018-10-21 12:39:09,919 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 11 states. [2018-10-21 12:39:10,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:10,190 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2018-10-21 12:39:10,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-21 12:39:10,191 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 16 [2018-10-21 12:39:10,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:10,192 INFO L225 Difference]: With dead ends: 33 [2018-10-21 12:39:10,192 INFO L226 Difference]: Without dead ends: 24 [2018-10-21 12:39:10,193 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=84, Invalid=222, Unknown=0, NotChecked=0, Total=306 [2018-10-21 12:39:10,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-21 12:39:10,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-10-21 12:39:10,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-21 12:39:10,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-21 12:39:10,198 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 16 [2018-10-21 12:39:10,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:10,199 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-21 12:39:10,199 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-21 12:39:10,199 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-21 12:39:10,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-21 12:39:10,200 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:10,200 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:10,200 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:10,201 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:10,201 INFO L82 PathProgramCache]: Analyzing trace with hash -1259125948, now seen corresponding path program 2 times [2018-10-21 12:39:10,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:10,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:10,202 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:10,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:10,202 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:10,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:10,282 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:10,283 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:10,283 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:10,283 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:10,283 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:10,284 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:10,285 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:10,300 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:10,300 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:10,315 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:10,315 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:10,318 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:10,336 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:10,337 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:10,409 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:10,431 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:10,432 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:10,448 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:10,449 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:10,475 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:10,475 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:10,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:10,501 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:10,502 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:10,552 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (5)] Exception during sending of exit command (exit): Broken pipe [2018-10-21 12:39:10,559 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:10,559 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-10-21 12:39:10,559 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:10,560 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-21 12:39:10,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-21 12:39:10,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-21 12:39:10,561 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 4 states. [2018-10-21 12:39:10,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:10,655 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2018-10-21 12:39:10,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-21 12:39:10,656 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2018-10-21 12:39:10,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:10,657 INFO L225 Difference]: With dead ends: 32 [2018-10-21 12:39:10,657 INFO L226 Difference]: Without dead ends: 23 [2018-10-21 12:39:10,658 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-21 12:39:10,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-10-21 12:39:10,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2018-10-21 12:39:10,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-21 12:39:10,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2018-10-21 12:39:10,667 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 20 [2018-10-21 12:39:10,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:10,668 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2018-10-21 12:39:10,668 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-21 12:39:10,668 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2018-10-21 12:39:10,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-10-21 12:39:10,669 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:10,669 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:10,669 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:10,669 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:10,671 INFO L82 PathProgramCache]: Analyzing trace with hash -2068472574, now seen corresponding path program 1 times [2018-10-21 12:39:10,672 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:10,672 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:10,673 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:10,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:10,676 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:10,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:11,123 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:11,123 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:11,123 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:11,124 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-10-21 12:39:11,124 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [15], [17], [20], [22], [24], [31], [34], [36], [42], [43], [44], [46] [2018-10-21 12:39:11,126 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:39:11,126 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:39:11,146 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-21 12:39:11,907 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-21 12:39:11,907 INFO L272 AbstractInterpreter]: Visited 16 different actions 284 times. Merged at 6 different actions 143 times. Widened at 1 different actions 21 times. Found 26 fixpoints after 2 different actions. Largest state had 6 variables. [2018-10-21 12:39:11,947 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:11,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-21 12:39:11,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:11,947 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:11,961 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:11,961 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:39:11,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:11,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:12,297 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:12,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:13,088 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:13,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:13,109 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:13,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:13,131 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:39:13,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:13,150 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:13,249 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:13,249 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:13,534 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:13,535 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:13,535 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 12, 11, 11] total 30 [2018-10-21 12:39:13,535 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:13,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-21 12:39:13,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-21 12:39:13,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=711, Unknown=1, NotChecked=0, Total=870 [2018-10-21 12:39:13,538 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 17 states. [2018-10-21 12:39:13,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:13,976 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2018-10-21 12:39:13,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-21 12:39:13,977 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 20 [2018-10-21 12:39:13,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:13,978 INFO L225 Difference]: With dead ends: 47 [2018-10-21 12:39:13,978 INFO L226 Difference]: Without dead ends: 34 [2018-10-21 12:39:13,980 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 55 SyntacticMatches, 6 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=239, Invalid=1020, Unknown=1, NotChecked=0, Total=1260 [2018-10-21 12:39:13,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-10-21 12:39:13,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-10-21 12:39:13,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-21 12:39:13,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-10-21 12:39:13,986 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 20 [2018-10-21 12:39:13,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:13,986 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-10-21 12:39:13,987 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-21 12:39:13,987 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-10-21 12:39:13,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-10-21 12:39:13,987 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:13,988 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:13,988 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:13,988 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:13,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1278729364, now seen corresponding path program 2 times [2018-10-21 12:39:13,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:13,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:13,989 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:39:13,990 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:13,990 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:14,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:14,100 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:14,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:14,100 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:14,100 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:14,101 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:14,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:14,101 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:14,119 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:14,119 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:14,141 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:14,141 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:14,143 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:14,151 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:14,152 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:14,202 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-21 12:39:14,223 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:14,223 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-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 [2018-10-21 12:39:14,242 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:39:14,242 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:39:14,268 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:39:14,268 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:14,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:14,297 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:14,297 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:14,307 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-21 12:39:14,309 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:14,309 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 4, 6, 4] total 8 [2018-10-21 12:39:14,309 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:14,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-21 12:39:14,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-21 12:39:14,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-10-21 12:39:14,310 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 6 states. [2018-10-21 12:39:14,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:14,538 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2018-10-21 12:39:14,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-21 12:39:14,539 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2018-10-21 12:39:14,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:14,541 INFO L225 Difference]: With dead ends: 44 [2018-10-21 12:39:14,541 INFO L226 Difference]: Without dead ends: 35 [2018-10-21 12:39:14,541 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 108 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-10-21 12:39:14,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-10-21 12:39:14,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2018-10-21 12:39:14,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-10-21 12:39:14,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2018-10-21 12:39:14,548 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 28 [2018-10-21 12:39:14,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:14,548 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2018-10-21 12:39:14,548 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-21 12:39:14,549 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2018-10-21 12:39:14,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-10-21 12:39:14,549 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:14,550 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:14,550 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:14,550 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:14,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1892400037, now seen corresponding path program 3 times [2018-10-21 12:39:14,550 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:14,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:14,551 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:14,551 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:14,551 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:14,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:14,744 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-21 12:39:14,744 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:14,744 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:14,744 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:14,744 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:14,745 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:14,745 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:14,754 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:39:14,754 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:39:14,763 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-10-21 12:39:14,763 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:14,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:14,844 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-10-21 12:39:14,844 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:14,923 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2018-10-21 12:39:14,944 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-10-21 12:39:14,944 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4, 5] imperfect sequences [9] total 13 [2018-10-21 12:39:14,944 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:39:14,944 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-21 12:39:14,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-21 12:39:14,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2018-10-21 12:39:14,945 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 4 states. [2018-10-21 12:39:14,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:14,980 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2018-10-21 12:39:14,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-21 12:39:14,981 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 32 [2018-10-21 12:39:14,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:14,982 INFO L225 Difference]: With dead ends: 42 [2018-10-21 12:39:14,982 INFO L226 Difference]: Without dead ends: 37 [2018-10-21 12:39:14,983 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2018-10-21 12:39:14,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-10-21 12:39:14,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-10-21 12:39:14,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-21 12:39:14,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2018-10-21 12:39:14,989 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2018-10-21 12:39:14,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:14,989 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2018-10-21 12:39:14,989 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-21 12:39:14,989 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2018-10-21 12:39:14,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-21 12:39:14,990 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:39:14,990 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:39:14,991 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:39:14,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:39:14,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1794670498, now seen corresponding path program 4 times [2018-10-21 12:39:14,991 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:39:14,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:14,992 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:39:14,992 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:39:14,992 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:39:15,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:39:15,317 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-10-21 12:39:15,317 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:15,317 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:39:15,317 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:39:15,318 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:39:15,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:15,318 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:39:15,328 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:39:15,328 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:39:15,357 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:39:15,357 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:15,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:15,814 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:15,815 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:21,754 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:21,775 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:39:21,775 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 12 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 12 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:39:21,799 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:39:21,799 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:39:21,835 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:39:21,835 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:39:21,840 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:39:21,902 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:21,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:39:26,892 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:39:26,896 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:39:26,896 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17, 17, 17] total 49 [2018-10-21 12:39:26,896 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:39:26,897 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-10-21 12:39:26,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-10-21 12:39:26,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=1968, Unknown=24, NotChecked=0, Total=2352 [2018-10-21 12:39:26,901 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 25 states. [2018-10-21 12:39:27,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:39:28,000 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2018-10-21 12:39:28,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-10-21 12:39:28,003 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 36 [2018-10-21 12:39:28,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:39:28,003 INFO L225 Difference]: With dead ends: 61 [2018-10-21 12:39:28,003 INFO L226 Difference]: Without dead ends: 0 [2018-10-21 12:39:28,006 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 105 SyntacticMatches, 7 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1276 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=781, Invalid=3751, Unknown=24, NotChecked=0, Total=4556 [2018-10-21 12:39:28,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-21 12:39:28,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-21 12:39:28,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-21 12:39:28,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-21 12:39:28,007 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 36 [2018-10-21 12:39:28,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:39:28,013 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-21 12:39:28,013 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-10-21 12:39:28,013 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-21 12:39:28,013 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-21 12:39:28,020 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-21 12:39:28,208 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-21 12:39:28,209 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-21 12:39:28,209 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-21 12:39:28,209 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-21 12:39:28,209 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-21 12:39:28,209 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-21 12:39:28,209 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 10 22) the Hoare annotation is: true [2018-10-21 12:39:28,209 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 10 22) no Hoare annotation was computed. [2018-10-21 12:39:28,209 INFO L425 ceAbstractionStarter]: For program point L20(line 20) no Hoare annotation was computed. [2018-10-21 12:39:28,210 INFO L425 ceAbstractionStarter]: For program point L16(lines 16 18) no Hoare annotation was computed. [2018-10-21 12:39:28,210 INFO L425 ceAbstractionStarter]: For program point L14(line 14) no Hoare annotation was computed. [2018-10-21 12:39:28,210 INFO L425 ceAbstractionStarter]: For program point L15-1(lines 15 19) no Hoare annotation was computed. [2018-10-21 12:39:28,210 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 10 22) no Hoare annotation was computed. [2018-10-21 12:39:28,210 INFO L425 ceAbstractionStarter]: For program point L15-3(lines 15 19) no Hoare annotation was computed. [2018-10-21 12:39:28,210 INFO L421 ceAbstractionStarter]: At program point L15-4(lines 15 19) the Hoare annotation is: (let ((.cse1 (* 2 main_~n~0)) (.cse2 (<= main_~n~0 main_~k~0))) (or (let ((.cse0 (+ main_~i~0 1))) (and (<= .cse0 .cse1) (<= .cse1 .cse0) .cse2)) (and (<= main_~i~0 .cse1) (<= .cse1 main_~i~0) .cse2) (and (<= 0 main_~n~0) (<= main_~n~0 0) (= main_~i~0 0)))) [2018-10-21 12:39:28,210 INFO L421 ceAbstractionStarter]: At program point L15-5(lines 15 19) the Hoare annotation is: (and (or (<= main_~n~0 0) (<= main_~n~0 main_~k~0)) (<= main_~k~0 main_~n~0)) [2018-10-21 12:39:28,210 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-10-21 12:39:28,210 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-10-21 12:39:28,211 INFO L425 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-10-21 12:39:28,211 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-10-21 12:39:28,211 INFO L425 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-10-21 12:39:28,211 INFO L425 ceAbstractionStarter]: For program point L4-2(lines 3 8) no Hoare annotation was computed. [2018-10-21 12:39:28,227 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.10 12:39:28 BoogieIcfgContainer [2018-10-21 12:39:28,227 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-21 12:39:28,228 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-21 12:39:28,228 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-21 12:39:28,228 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-21 12:39:28,228 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:39:06" (3/4) ... [2018-10-21 12:39:28,232 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-10-21 12:39:28,237 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-10-21 12:39:28,238 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-10-21 12:39:28,238 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-10-21 12:39:28,241 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2018-10-21 12:39:28,242 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2018-10-21 12:39:28,244 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-10-21 12:39:28,287 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-21 12:39:28,287 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-21 12:39:28,288 INFO L168 Benchmark]: Toolchain (without parser) took 22256.74 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 295.2 MB). Free memory was 951.9 MB in the beginning and 1.1 GB in the end (delta: -115.4 MB). Peak memory consumption was 179.8 MB. Max. memory is 11.5 GB. [2018-10-21 12:39:28,290 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:39:28,290 INFO L168 Benchmark]: CACSL2BoogieTranslator took 334.85 ms. Allocated memory is still 1.0 GB. Free memory was 951.9 MB in the beginning and 941.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-21 12:39:28,291 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.10 ms. Allocated memory is still 1.0 GB. Free memory is still 941.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:39:28,291 INFO L168 Benchmark]: Boogie Preprocessor took 27.12 ms. Allocated memory is still 1.0 GB. Free memory is still 941.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:39:28,293 INFO L168 Benchmark]: RCFGBuilder took 468.18 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 148.9 MB). Free memory was 941.1 MB in the beginning and 1.1 GB in the end (delta: -185.1 MB). Peak memory consumption was 26.6 MB. Max. memory is 11.5 GB. [2018-10-21 12:39:28,294 INFO L168 Benchmark]: TraceAbstraction took 21336.25 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 146.3 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 59.0 MB). Peak memory consumption was 205.3 MB. Max. memory is 11.5 GB. [2018-10-21 12:39:28,295 INFO L168 Benchmark]: Witness Printer took 59.36 ms. Allocated memory is still 1.3 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:39:28,300 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 334.85 ms. Allocated memory is still 1.0 GB. Free memory was 951.9 MB in the beginning and 941.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 25.10 ms. Allocated memory is still 1.0 GB. Free memory is still 941.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 27.12 ms. Allocated memory is still 1.0 GB. Free memory is still 941.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 468.18 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 148.9 MB). Free memory was 941.1 MB in the beginning and 1.1 GB in the end (delta: -185.1 MB). Peak memory consumption was 26.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 21336.25 ms. Allocated memory was 1.2 GB in the beginning and 1.3 GB in the end (delta: 146.3 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 59.0 MB). Peak memory consumption was 205.3 MB. Max. memory is 11.5 GB. * Witness Printer took 59.36 ms. Allocated memory is still 1.3 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 15]: Loop Invariant Derived loop invariant: (((i + 1 <= 2 * n && 2 * n <= i + 1) && n <= k) || ((i <= 2 * n && 2 * n <= i) && n <= k)) || ((0 <= n && n <= 0) && i == 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. SAFE Result, 21.2s OverallTime, 8 OverallIterations, 7 TraceHistogramMax, 2.6s AutomataDifference, 0.0s DeadEndRemovalTime, 0.1s HoareAnnotationTime, HoareTripleCheckerStatistics: 115 SDtfs, 69 SDslu, 465 SDs, 0 SdLazy, 688 SolverSat, 41 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 633 GetRequests, 465 SyntacticMatches, 24 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1625 ImplicationChecksByTransitivity, 16.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.1s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 16 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 18 PreInvPairs, 32 NumberOfFragments, 59 HoareAnnotationTreeSize, 18 FomulaSimplifications, 98 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 209 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 16.2s InterpolantComputationTime, 447 NumberOfCodeBlocks, 431 NumberOfCodeBlocksAsserted, 26 NumberOfCheckSat, 689 ConstructedInterpolants, 30 QuantifiedInterpolants, 133879 SizeOfPredicates, 28 NumberOfNonLiveVariables, 581 ConjunctsInSsa, 151 ConjunctsInUnsatCore, 30 InterpolantComputations, 4 PerfectInterpolantSequences, 218/760 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...