./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call2_true-termination.i --full-output --rcfgbuilder.size.of.a.code.block SingleStatement --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-acceleration/underapprox_false-unreach-call2_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 c0ad4658b31654787cb281a441e891421d607e94 --rcfgbuilder.size.of.a.code.block SingleStatement .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.23-0210da8 [2018-10-22 09:48:35,234 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 09:48:35,236 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 09:48:35,250 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 09:48:35,250 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 09:48:35,251 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 09:48:35,253 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 09:48:35,255 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 09:48:35,256 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 09:48:35,257 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 09:48:35,258 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 09:48:35,259 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 09:48:35,259 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 09:48:35,261 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 09:48:35,262 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 09:48:35,263 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 09:48:35,264 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 09:48:35,266 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 09:48:35,268 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 09:48:35,270 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 09:48:35,271 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 09:48:35,272 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 09:48:35,275 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 09:48:35,275 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 09:48:35,275 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 09:48:35,276 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 09:48:35,277 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 09:48:35,279 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 09:48:35,279 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 09:48:35,280 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 09:48:35,281 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 09:48:35,282 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 09:48:35,282 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 09:48:35,282 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 09:48:35,283 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 09:48:35,284 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 09:48:35,285 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-22 09:48:35,309 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 09:48:35,313 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 09:48:35,314 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 09:48:35,314 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 09:48:35,314 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 09:48:35,314 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 09:48:35,314 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 09:48:35,314 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 09:48:35,315 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 09:48:35,315 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 09:48:35,315 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 09:48:35,316 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 09:48:35,318 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-22 09:48:35,318 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 09:48:35,318 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-22 09:48:35,318 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 09:48:35,318 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 09:48:35,319 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 09:48:35,319 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 09:48:35,319 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-22 09:48:35,319 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 09:48:35,319 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 09:48:35,319 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 09:48:35,320 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 09:48:35,320 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 09:48:35,320 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 09:48:35,320 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 09:48:35,320 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 09:48:35,321 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 09:48:35,322 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 09:48:35,323 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 09:48:35,323 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 09:48:35,323 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 09:48:35,323 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 09:48:35,324 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 -> c0ad4658b31654787cb281a441e891421d607e94 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement [2018-10-22 09:48:35,382 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 09:48:35,394 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 09:48:35,397 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 09:48:35,398 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 09:48:35,398 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 09:48:35,399 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call2_true-termination.i [2018-10-22 09:48:35,459 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d6c0f3932/b6867680a62e4cb48b6efe9bc0666246/FLAGda55ae7db [2018-10-22 09:48:35,860 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 09:48:35,861 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_false-unreach-call2_true-termination.i [2018-10-22 09:48:35,867 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d6c0f3932/b6867680a62e4cb48b6efe9bc0666246/FLAGda55ae7db [2018-10-22 09:48:35,880 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/d6c0f3932/b6867680a62e4cb48b6efe9bc0666246 [2018-10-22 09:48:35,884 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 09:48:35,885 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-22 09:48:35,887 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 09:48:35,887 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 09:48:35,891 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 09:48:35,892 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 09:48:35" (1/1) ... [2018-10-22 09:48:35,895 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@528c740e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:35, skipping insertion in model container [2018-10-22 09:48:35,895 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 09:48:35" (1/1) ... [2018-10-22 09:48:35,905 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 09:48:35,929 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 09:48:36,106 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 09:48:36,110 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 09:48:36,126 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 09:48:36,141 INFO L193 MainTranslator]: Completed translation [2018-10-22 09:48:36,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36 WrapperNode [2018-10-22 09:48:36,141 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 09:48:36,142 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 09:48:36,142 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 09:48:36,143 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 09:48:36,151 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,156 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,161 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 09:48:36,162 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 09:48:36,162 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 09:48:36,162 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 09:48:36,170 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,171 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,171 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,173 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,180 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,181 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (1/1) ... [2018-10-22 09:48:36,182 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 09:48:36,182 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 09:48:36,182 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 09:48:36,183 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 09:48:36,183 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (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 [2018-10-22 09:48:36,306 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 09:48:36,307 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 09:48:36,307 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 09:48:36,307 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 09:48:36,307 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 09:48:36,307 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 09:48:36,307 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 09:48:36,307 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 09:48:36,509 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 09:48:36,509 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:48:36 BoogieIcfgContainer [2018-10-22 09:48:36,510 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 09:48:36,511 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 09:48:36,511 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 09:48:36,515 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 09:48:36,515 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 09:48:35" (1/3) ... [2018-10-22 09:48:36,516 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31e4357a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 09:48:36, skipping insertion in model container [2018-10-22 09:48:36,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 09:48:36" (2/3) ... [2018-10-22 09:48:36,517 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31e4357a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 09:48:36, skipping insertion in model container [2018-10-22 09:48:36,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:48:36" (3/3) ... [2018-10-22 09:48:36,520 INFO L112 eAbstractionObserver]: Analyzing ICFG underapprox_false-unreach-call2_true-termination.i [2018-10-22 09:48:36,530 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 09:48:36,539 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 09:48:36,563 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 09:48:36,631 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 09:48:36,634 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 09:48:36,637 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 09:48:36,637 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 09:48:36,637 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 09:48:36,637 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 09:48:36,637 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 09:48:36,637 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 09:48:36,638 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 09:48:36,665 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-10-22 09:48:36,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 09:48:36,671 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:48:36,672 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:48:36,674 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:48:36,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:36,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1366875479, now seen corresponding path program 1 times [2018-10-22 09:48:36,682 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:48:36,727 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:36,727 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:48:36,728 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:36,728 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:48:36,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:36,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:36,791 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 09:48:36,791 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 09:48:36,791 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 09:48:36,795 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 09:48:36,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 09:48:36,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 09:48:36,813 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2018-10-22 09:48:36,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:48:36,835 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-10-22 09:48:36,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 09:48:36,837 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2018-10-22 09:48:36,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:48:36,847 INFO L225 Difference]: With dead ends: 34 [2018-10-22 09:48:36,847 INFO L226 Difference]: Without dead ends: 17 [2018-10-22 09:48:36,851 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 [2018-10-22 09:48:36,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2018-10-22 09:48:36,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-10-22 09:48:36,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-22 09:48:36,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2018-10-22 09:48:36,888 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2018-10-22 09:48:36,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:48:36,888 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2018-10-22 09:48:36,889 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 09:48:36,889 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2018-10-22 09:48:36,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-10-22 09:48:36,889 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:48:36,890 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:48:36,891 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:48:36,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:36,891 INFO L82 PathProgramCache]: Analyzing trace with hash 208492182, now seen corresponding path program 1 times [2018-10-22 09:48:36,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:48:36,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:36,893 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:48:36,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:36,894 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:48:36,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:36,969 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:36,969 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 09:48:36,969 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-22 09:48:36,969 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 09:48:36,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-22 09:48:36,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-22 09:48:36,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 09:48:36,973 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 3 states. [2018-10-22 09:48:37,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:48:37,023 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2018-10-22 09:48:37,024 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-22 09:48:37,024 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2018-10-22 09:48:37,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:48:37,025 INFO L225 Difference]: With dead ends: 26 [2018-10-22 09:48:37,025 INFO L226 Difference]: Without dead ends: 21 [2018-10-22 09:48:37,026 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-22 09:48:37,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-22 09:48:37,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2018-10-22 09:48:37,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-10-22 09:48:37,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2018-10-22 09:48:37,035 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 12 [2018-10-22 09:48:37,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:48:37,036 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2018-10-22 09:48:37,036 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-22 09:48:37,036 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2018-10-22 09:48:37,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-10-22 09:48:37,039 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:48:37,039 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:48:37,039 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:48:37,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:37,040 INFO L82 PathProgramCache]: Analyzing trace with hash -105647234, now seen corresponding path program 1 times [2018-10-22 09:48:37,041 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:48:37,042 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:37,043 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:48:37,043 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:37,043 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:48:37,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:37,211 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:37,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:37,212 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:48:37,213 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 19 with the following transitions: [2018-10-22 09:48:37,214 INFO L202 CegarAbsIntRunner]: [0], [4], [5], [9], [13], [15], [16], [17], [18], [19], [25], [28], [30], [36], [37], [38], [40] [2018-10-22 09:48:37,262 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 09:48:37,263 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 09:48:37,387 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 09:48:37,652 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 09:48:37,654 INFO L272 AbstractInterpreter]: Visited 17 different actions 105 times. Merged at 7 different actions 61 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-22 09:48:37,679 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:37,680 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 09:48:37,680 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:37,681 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 [2018-10-22 09:48:37,692 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:48:37,692 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 09:48:37,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:37,732 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:37,777 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:37,777 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:38,237 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:38,267 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:38,267 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 [2018-10-22 09:48:38,287 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:48:38,287 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 09:48:38,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:38,304 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:38,381 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:38,381 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:38,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:38,428 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:48:38,428 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 7, 7, 7] total 12 [2018-10-22 09:48:38,429 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:48:38,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 09:48:38,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 09:48:38,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2018-10-22 09:48:38,430 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 5 states. [2018-10-22 09:48:38,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:48:38,527 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-10-22 09:48:38,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-22 09:48:38,528 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2018-10-22 09:48:38,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:48:38,529 INFO L225 Difference]: With dead ends: 32 [2018-10-22 09:48:38,529 INFO L226 Difference]: Without dead ends: 27 [2018-10-22 09:48:38,530 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2018-10-22 09:48:38,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-22 09:48:38,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 25. [2018-10-22 09:48:38,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-22 09:48:38,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-10-22 09:48:38,536 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 18 [2018-10-22 09:48:38,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:48:38,536 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-10-22 09:48:38,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 09:48:38,537 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-10-22 09:48:38,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-10-22 09:48:38,538 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:48:38,538 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:48:38,538 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:48:38,538 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:38,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1757724058, now seen corresponding path program 2 times [2018-10-22 09:48:38,539 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:48:38,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:38,540 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 09:48:38,540 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:38,540 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:48:38,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:38,830 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:38,830 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:38,831 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:48:38,831 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 09:48:38,831 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 09:48:38,831 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:38,831 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 [2018-10-22 09:48:38,839 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 09:48:38,840 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 09:48:38,869 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 09:48:38,869 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:48:38,872 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:38,891 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:38,891 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:39,417 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:39,438 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:39,438 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 [2018-10-22 09:48:39,454 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 09:48:39,454 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 09:48:39,474 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 09:48:39,474 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:48:39,479 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:39,574 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:39,574 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:39,582 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:39,584 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:48:39,584 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9, 9, 9] total 16 [2018-10-22 09:48:39,584 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:48:39,585 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-22 09:48:39,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-22 09:48:39,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2018-10-22 09:48:39,586 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 7 states. [2018-10-22 09:48:39,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:48:39,820 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-10-22 09:48:39,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 09:48:39,821 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2018-10-22 09:48:39,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:48:39,822 INFO L225 Difference]: With dead ends: 38 [2018-10-22 09:48:39,823 INFO L226 Difference]: Without dead ends: 33 [2018-10-22 09:48:39,824 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 83 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2018-10-22 09:48:39,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-10-22 09:48:39,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2018-10-22 09:48:39,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-10-22 09:48:39,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-10-22 09:48:39,830 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 24 [2018-10-22 09:48:39,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:48:39,830 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-10-22 09:48:39,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-22 09:48:39,830 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-10-22 09:48:39,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-10-22 09:48:39,831 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:48:39,832 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:48:39,832 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:48:39,832 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:39,832 INFO L82 PathProgramCache]: Analyzing trace with hash -902446258, now seen corresponding path program 3 times [2018-10-22 09:48:39,832 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:48:39,833 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:39,833 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 09:48:39,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:39,834 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:48:39,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:40,030 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:40,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:40,031 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:48:40,031 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 09:48:40,031 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 09:48:40,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:40,031 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 [2018-10-22 09:48:40,041 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 09:48:40,041 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 09:48:40,066 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 09:48:40,066 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:48:40,069 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:40,087 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:40,087 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:40,460 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:40,479 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:40,480 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 [2018-10-22 09:48:40,497 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 09:48:40,497 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 09:48:40,530 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 09:48:40,530 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:48:40,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:40,600 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:40,600 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:40,617 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:40,619 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:48:40,619 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11, 11, 11] total 20 [2018-10-22 09:48:40,619 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:48:40,620 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-22 09:48:40,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-22 09:48:40,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=317, Unknown=0, NotChecked=0, Total=380 [2018-10-22 09:48:40,621 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 9 states. [2018-10-22 09:48:40,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:48:40,839 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-10-22 09:48:40,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 09:48:40,839 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2018-10-22 09:48:40,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:48:40,841 INFO L225 Difference]: With dead ends: 44 [2018-10-22 09:48:40,842 INFO L226 Difference]: Without dead ends: 39 [2018-10-22 09:48:40,843 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 105 SyntacticMatches, 5 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-10-22 09:48:40,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-10-22 09:48:40,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2018-10-22 09:48:40,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-10-22 09:48:40,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-10-22 09:48:40,848 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 30 [2018-10-22 09:48:40,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:48:40,848 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-10-22 09:48:40,849 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-22 09:48:40,849 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-10-22 09:48:40,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-10-22 09:48:40,850 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:48:40,850 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:48:40,850 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:48:40,850 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:40,850 INFO L82 PathProgramCache]: Analyzing trace with hash 1744172598, now seen corresponding path program 4 times [2018-10-22 09:48:40,850 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:48:40,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:40,851 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 09:48:40,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:40,852 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:48:40,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:41,039 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:41,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:41,039 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:48:41,039 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 09:48:41,039 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 09:48:41,040 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:41,040 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 [2018-10-22 09:48:41,049 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 09:48:41,049 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 09:48:41,061 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 09:48:41,061 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:48:41,064 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:41,082 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:41,083 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:41,539 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:41,560 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:41,560 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 [2018-10-22 09:48:41,577 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 09:48:41,577 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 09:48:41,602 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 09:48:41,602 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:48:41,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:41,711 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:41,712 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:41,755 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:41,760 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:48:41,760 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 13, 13, 13] total 24 [2018-10-22 09:48:41,760 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:48:41,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-10-22 09:48:41,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-10-22 09:48:41,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2018-10-22 09:48:41,762 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 11 states. [2018-10-22 09:48:42,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:48:42,245 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-10-22 09:48:42,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 09:48:42,246 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 36 [2018-10-22 09:48:42,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:48:42,247 INFO L225 Difference]: With dead ends: 50 [2018-10-22 09:48:42,247 INFO L226 Difference]: Without dead ends: 45 [2018-10-22 09:48:42,248 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 127 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=178, Invalid=814, Unknown=0, NotChecked=0, Total=992 [2018-10-22 09:48:42,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-10-22 09:48:42,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2018-10-22 09:48:42,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-10-22 09:48:42,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-10-22 09:48:42,254 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 36 [2018-10-22 09:48:42,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:48:42,254 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-10-22 09:48:42,254 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-10-22 09:48:42,254 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-10-22 09:48:42,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-10-22 09:48:42,256 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:48:42,256 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:48:42,257 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:48:42,257 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:42,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1645323490, now seen corresponding path program 5 times [2018-10-22 09:48:42,257 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:48:42,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:42,258 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 09:48:42,258 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:42,258 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:48:42,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 09:48:42,567 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:42,567 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:42,567 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 09:48:42,567 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 09:48:42,567 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 09:48:42,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:42,568 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 [2018-10-22 09:48:42,576 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 09:48:42,576 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 09:48:42,639 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 09:48:42,639 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:48:42,643 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:42,668 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:42,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:43,031 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:43,051 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 09:48:43,051 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 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 [2018-10-22 09:48:43,067 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 09:48:43,067 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 09:48:43,118 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 09:48:43,118 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 09:48:43,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 09:48:43,439 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:43,439 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 09:48:43,456 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 09:48:43,459 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 09:48:43,459 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 15, 15, 15] total 28 [2018-10-22 09:48:43,459 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 09:48:43,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-10-22 09:48:43,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-10-22 09:48:43,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2018-10-22 09:48:43,461 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 13 states. [2018-10-22 09:48:43,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 09:48:43,859 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-10-22 09:48:43,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-10-22 09:48:43,859 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 42 [2018-10-22 09:48:43,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 09:48:43,860 INFO L225 Difference]: With dead ends: 56 [2018-10-22 09:48:43,860 INFO L226 Difference]: Without dead ends: 51 [2018-10-22 09:48:43,862 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 149 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=240, Invalid=1166, Unknown=0, NotChecked=0, Total=1406 [2018-10-22 09:48:43,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-10-22 09:48:43,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2018-10-22 09:48:43,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-10-22 09:48:43,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-10-22 09:48:43,867 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 42 [2018-10-22 09:48:43,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 09:48:43,868 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-10-22 09:48:43,868 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-10-22 09:48:43,868 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-10-22 09:48:43,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-10-22 09:48:43,869 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 09:48:43,869 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 09:48:43,869 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 09:48:43,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 09:48:43,870 INFO L82 PathProgramCache]: Analyzing trace with hash 1504801286, now seen corresponding path program 6 times [2018-10-22 09:48:43,870 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 09:48:43,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:43,871 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 09:48:43,871 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 09:48:43,871 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 09:48:43,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 09:48:43,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 09:48:43,909 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-22 09:48:43,939 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 09:48:43 BoogieIcfgContainer [2018-10-22 09:48:43,939 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 09:48:43,940 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-22 09:48:43,940 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-22 09:48:43,940 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-22 09:48:43,940 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 09:48:36" (3/4) ... [2018-10-22 09:48:43,943 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-22 09:48:44,000 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-22 09:48:44,000 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-22 09:48:44,001 INFO L168 Benchmark]: Toolchain (without parser) took 8116.86 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 210.2 MB). Free memory was 953.2 MB in the beginning and 964.9 MB in the end (delta: -11.7 MB). Peak memory consumption was 198.5 MB. Max. memory is 11.5 GB. [2018-10-22 09:48:44,003 INFO L168 Benchmark]: CDTParser took 0.25 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. [2018-10-22 09:48:44,004 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.25 ms. Allocated memory is still 1.0 GB. Free memory was 953.2 MB in the beginning and 942.4 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-22 09:48:44,004 INFO L168 Benchmark]: Boogie Procedure Inliner took 19.14 ms. Allocated memory is still 1.0 GB. Free memory is still 942.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 09:48:44,005 INFO L168 Benchmark]: Boogie Preprocessor took 20.33 ms. Allocated memory is still 1.0 GB. Free memory is still 942.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 09:48:44,005 INFO L168 Benchmark]: RCFGBuilder took 327.44 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.8 MB). Free memory was 942.4 MB in the beginning and 1.1 GB in the end (delta: -188.3 MB). Peak memory consumption was 26.6 MB. Max. memory is 11.5 GB. [2018-10-22 09:48:44,006 INFO L168 Benchmark]: TraceAbstraction took 7428.79 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 63.4 MB). Free memory was 1.1 GB in the beginning and 972.2 MB in the end (delta: 158.5 MB). Peak memory consumption was 221.9 MB. Max. memory is 11.5 GB. [2018-10-22 09:48:44,007 INFO L168 Benchmark]: Witness Printer took 60.70 ms. Allocated memory is still 1.2 GB. Free memory was 972.2 MB in the beginning and 964.9 MB in the end (delta: 7.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 11.5 GB. [2018-10-22 09:48:44,012 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 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 255.25 ms. Allocated memory is still 1.0 GB. Free memory was 953.2 MB in the beginning and 942.4 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 19.14 ms. Allocated memory is still 1.0 GB. Free memory is still 942.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 20.33 ms. Allocated memory is still 1.0 GB. Free memory is still 942.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 327.44 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.8 MB). Free memory was 942.4 MB in the beginning and 1.1 GB in the end (delta: -188.3 MB). Peak memory consumption was 26.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 7428.79 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 63.4 MB). Free memory was 1.1 GB in the beginning and 972.2 MB in the end (delta: 158.5 MB). Peak memory consumption was 221.9 MB. Max. memory is 11.5 GB. * Witness Printer took 60.70 ms. Allocated memory is still 1.2 GB. Free memory was 972.2 MB in the beginning and 964.9 MB in the end (delta: 7.4 MB). Peak memory consumption was 7.4 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L9] unsigned int x = 0; VAL [x=0] [L10] unsigned int y = 1; VAL [x=0, y=1] [L11] COND TRUE x < 6 VAL [x=0, y=1] [L12] x++ VAL [x=1, y=1] [L13] y *= 2 VAL [x=1, y=2] [L11] COND TRUE x < 6 VAL [x=1, y=2] [L12] x++ VAL [x=2, y=2] [L13] y *= 2 VAL [x=2, y=4] [L11] COND TRUE x < 6 VAL [x=2, y=4] [L12] x++ VAL [x=3, y=4] [L13] y *= 2 VAL [x=3, y=8] [L11] COND TRUE x < 6 VAL [x=3, y=8] [L12] x++ VAL [x=4, y=8] [L13] y *= 2 VAL [x=4, y=16] [L11] COND TRUE x < 6 VAL [x=4, y=16] [L12] x++ VAL [x=5, y=16] [L13] y *= 2 VAL [x=5, y=32] [L11] COND TRUE x < 6 VAL [x=5, y=32] [L12] x++ VAL [x=6, y=32] [L13] y *= 2 VAL [x=6, y=64] [L11] COND FALSE !(x < 6) VAL [x=6, y=64] [L15] CALL __VERIFIER_assert(x != 6) VAL [\old(cond)=0] [L3] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L4] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. UNSAFE Result, 7.3s OverallTime, 8 OverallIterations, 7 TraceHistogramMax, 1.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 148 SDtfs, 27 SDslu, 658 SDs, 0 SdLazy, 546 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 676 GetRequests, 529 SyntacticMatches, 26 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 4.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 4.2s InterpolantComputationTime, 521 NumberOfCodeBlocks, 521 NumberOfCodeBlocksAsserted, 38 NumberOfCheckSat, 746 ConstructedInterpolants, 0 QuantifiedInterpolants, 134524 SizeOfPredicates, 70 NumberOfNonLiveVariables, 520 ConjunctsInSsa, 205 ConjunctsInUnsatCore, 27 InterpolantComputations, 2 PerfectInterpolantSequences, 0/750 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...