./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loops/sum01_bug02_false-unreach-call_true-termination.i --full-output --rcfgbuilder.size.of.a.code.block LoopFreeBlock --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/loops/sum01_bug02_false-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 c5465a084053aead702161d951dd339bfa1665d5 --rcfgbuilder.size.of.a.code.block LoopFreeBlock ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 10:04:22,432 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 10:04:22,435 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 10:04:22,453 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 10:04:22,454 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 10:04:22,455 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 10:04:22,456 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 10:04:22,459 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 10:04:22,460 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 10:04:22,461 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 10:04:22,462 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 10:04:22,463 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 10:04:22,463 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 10:04:22,465 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 10:04:22,466 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 10:04:22,467 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 10:04:22,468 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 10:04:22,470 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 10:04:22,472 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 10:04:22,474 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 10:04:22,476 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 10:04:22,477 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 10:04:22,479 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 10:04:22,481 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 10:04:22,483 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 10:04:22,484 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 10:04:22,487 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 10:04:22,488 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 10:04:22,489 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 10:04:22,491 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 10:04:22,493 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 10:04:22,494 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 10:04:22,495 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 10:04:22,495 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 10:04:22,498 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 10:04:22,499 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 10:04:22,499 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-22 10:04:22,525 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 10:04:22,525 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 10:04:22,527 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 10:04:22,527 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 10:04:22,527 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 10:04:22,527 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 10:04:22,527 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 10:04:22,528 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 10:04:22,528 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 10:04:22,528 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 10:04:22,528 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 10:04:22,530 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 10:04:22,530 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-22 10:04:22,530 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 10:04:22,531 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-22 10:04:22,531 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 10:04:22,531 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 10:04:22,531 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 10:04:22,531 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 10:04:22,531 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-22 10:04:22,532 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 10:04:22,533 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 10:04:22,533 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 10:04:22,533 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 10:04:22,533 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 10:04:22,534 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 10:04:22,534 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 10:04:22,534 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 10:04:22,534 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 10:04:22,534 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 10:04:22,535 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 10:04:22,536 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 10:04:22,536 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 10:04:22,537 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 10:04:22,537 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 -> c5465a084053aead702161d951dd339bfa1665d5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock [2018-10-22 10:04:22,619 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 10:04:22,638 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 10:04:22,643 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 10:04:22,645 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 10:04:22,645 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 10:04:22,646 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/sum01_bug02_false-unreach-call_true-termination.i [2018-10-22 10:04:22,703 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2f66a3116/47294947b0714684979fe4f8c1d205ee/FLAG8834fc947 [2018-10-22 10:04:23,153 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 10:04:23,162 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_false-unreach-call_true-termination.i [2018-10-22 10:04:23,170 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2f66a3116/47294947b0714684979fe4f8c1d205ee/FLAG8834fc947 [2018-10-22 10:04:23,191 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/2f66a3116/47294947b0714684979fe4f8c1d205ee [2018-10-22 10:04:23,196 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 10:04:23,199 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-22 10:04:23,201 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 10:04:23,204 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 10:04:23,209 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 10:04:23,210 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,213 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67ef2998 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23, skipping insertion in model container [2018-10-22 10:04:23,214 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,225 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 10:04:23,257 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 10:04:23,439 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 10:04:23,443 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 10:04:23,457 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 10:04:23,473 INFO L193 MainTranslator]: Completed translation [2018-10-22 10:04:23,474 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23 WrapperNode [2018-10-22 10:04:23,474 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 10:04:23,475 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 10:04:23,475 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 10:04:23,475 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 10:04:23,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,491 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,498 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 10:04:23,499 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 10:04:23,499 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 10:04:23,499 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 10:04:23,508 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,508 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,509 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,509 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,512 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,517 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,518 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,519 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 10:04:23,520 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 10:04:23,520 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 10:04:23,520 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 10:04:23,522 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (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 10:04:23,641 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 10:04:23,642 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 10:04:23,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 10:04:23,642 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 10:04:23,642 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 10:04:23,642 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 10:04:23,642 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 10:04:23,643 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 10:04:24,204 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 10:04:24,205 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 10:04:24 BoogieIcfgContainer [2018-10-22 10:04:24,205 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 10:04:24,206 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 10:04:24,207 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 10:04:24,211 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 10:04:24,211 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 10:04:23" (1/3) ... [2018-10-22 10:04:24,212 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@315a8885 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 10:04:24, skipping insertion in model container [2018-10-22 10:04:24,212 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23" (2/3) ... [2018-10-22 10:04:24,213 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@315a8885 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 10:04:24, skipping insertion in model container [2018-10-22 10:04:24,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 10:04:24" (3/3) ... [2018-10-22 10:04:24,215 INFO L112 eAbstractionObserver]: Analyzing ICFG sum01_bug02_false-unreach-call_true-termination.i [2018-10-22 10:04:24,227 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 10:04:24,249 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 10:04:24,269 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 10:04:24,312 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 10:04:24,313 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 10:04:24,313 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 10:04:24,313 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 10:04:24,313 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 10:04:24,313 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 10:04:24,313 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 10:04:24,313 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 10:04:24,313 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 10:04:24,330 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-22 10:04:24,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 10:04:24,338 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:24,339 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:24,342 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:24,348 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:24,348 INFO L82 PathProgramCache]: Analyzing trace with hash -2007171518, now seen corresponding path program 1 times [2018-10-22 10:04:24,351 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:24,403 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,403 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:24,404 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,404 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:24,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:24,481 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 10:04:24,484 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 10:04:24,484 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 10:04:24,484 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 10:04:24,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 10:04:24,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 10:04:24,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 10:04:24,512 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-22 10:04:24,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:24,539 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-22 10:04:24,540 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 10:04:24,541 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 10:04:24,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:24,549 INFO L225 Difference]: With dead ends: 29 [2018-10-22 10:04:24,549 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 10:04:24,553 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 10:04:24,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 10:04:24,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-22 10:04:24,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-22 10:04:24,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-22 10:04:24,591 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-22 10:04:24,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:24,591 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-22 10:04:24,591 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 10:04:24,592 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-22 10:04:24,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 10:04:24,593 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:24,593 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:24,594 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:24,595 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:24,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1715017247, now seen corresponding path program 1 times [2018-10-22 10:04:24,595 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:24,596 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,596 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:24,597 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,598 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:24,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:24,718 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 10:04:24,718 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 10:04:24,720 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 10:04:24,720 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 10:04:24,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 10:04:24,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 10:04:24,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 10:04:24,723 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-22 10:04:24,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:24,821 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-22 10:04:24,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 10:04:24,827 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-22 10:04:24,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:24,828 INFO L225 Difference]: With dead ends: 19 [2018-10-22 10:04:24,828 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 10:04:24,829 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-22 10:04:24,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 10:04:24,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 10:04:24,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 10:04:24,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 10:04:24,834 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-22 10:04:24,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:24,834 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 10:04:24,834 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 10:04:24,834 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 10:04:24,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 10:04:24,836 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:24,836 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:24,836 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:24,837 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:24,837 INFO L82 PathProgramCache]: Analyzing trace with hash 619631367, now seen corresponding path program 1 times [2018-10-22 10:04:24,837 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:24,839 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,839 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:24,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,840 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:24,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:25,112 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 14 [2018-10-22 10:04:25,263 WARN L179 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 9 [2018-10-22 10:04:25,354 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 10:04:25,355 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:25,355 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:25,357 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-22 10:04:25,360 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [28], [31], [33], [39], [40], [41], [43], [48] [2018-10-22 10:04:25,430 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 10:04:25,431 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 10:04:25,621 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 10:04:26,592 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 10:04:26,594 INFO L272 AbstractInterpreter]: Visited 12 different actions 186 times. Merged at 3 different actions 75 times. Widened at 1 different actions 21 times. Found 1 fixpoints after 1 different actions. Largest state had 7 variables. [2018-10-22 10:04:26,631 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:26,633 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 10:04:26,633 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:26,633 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 10:04:26,645 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:26,646 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 10:04:26,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:26,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:26,896 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 10:04:26,897 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:27,352 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 10:04:27,375 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:27,375 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 10:04:27,394 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:27,394 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 10:04:27,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:27,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:27,464 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 10:04:27,464 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:27,637 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 10:04:27,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:27,640 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 15 [2018-10-22 10:04:27,641 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:27,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 10:04:27,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 10:04:27,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2018-10-22 10:04:27,643 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2018-10-22 10:04:28,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:28,018 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-22 10:04:28,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 10:04:28,018 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2018-10-22 10:04:28,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:28,019 INFO L225 Difference]: With dead ends: 21 [2018-10-22 10:04:28,019 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 10:04:28,020 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2018-10-22 10:04:28,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 10:04:28,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 10:04:28,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 10:04:28,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-22 10:04:28,025 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-22 10:04:28,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:28,025 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-22 10:04:28,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 10:04:28,025 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-22 10:04:28,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 10:04:28,026 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:28,026 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:28,027 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:28,027 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:28,027 INFO L82 PathProgramCache]: Analyzing trace with hash 220788207, now seen corresponding path program 2 times [2018-10-22 10:04:28,027 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:28,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:28,028 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:28,028 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:28,029 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:28,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:28,303 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:28,304 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:28,304 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:28,305 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:28,305 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:28,305 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:28,305 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 10:04:28,323 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 10:04:28,323 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:28,346 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 10:04:28,346 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:28,349 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:28,519 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:28,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:29,102 WARN L179 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2018-10-22 10:04:29,144 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:29,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:29,165 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 10:04:29,183 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 10:04:29,183 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:29,203 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 10:04:29,204 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:29,207 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:29,253 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:29,254 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:29,439 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:29,441 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:29,441 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 18 [2018-10-22 10:04:29,441 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:29,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 10:04:29,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 10:04:29,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2018-10-22 10:04:29,443 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 12 states. [2018-10-22 10:04:29,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:29,627 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-22 10:04:29,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 10:04:29,629 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2018-10-22 10:04:29,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:29,630 INFO L225 Difference]: With dead ends: 23 [2018-10-22 10:04:29,630 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 10:04:29,632 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2018-10-22 10:04:29,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 10:04:29,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 10:04:29,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 10:04:29,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 10:04:29,637 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-22 10:04:29,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:29,637 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 10:04:29,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 10:04:29,637 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 10:04:29,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 10:04:29,638 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:29,638 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:29,640 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:29,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:29,641 INFO L82 PathProgramCache]: Analyzing trace with hash -815399209, now seen corresponding path program 3 times [2018-10-22 10:04:29,641 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:29,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:29,643 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:29,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:29,643 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:29,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:29,857 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:29,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:29,858 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:29,858 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:29,858 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:29,858 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:29,859 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 10:04:29,882 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 10:04:29,883 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 10:04:29,928 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 10:04:29,928 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:29,930 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:30,311 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:30,312 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:30,868 WARN L179 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2018-10-22 10:04:31,180 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:31,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:31,204 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 10:04:31,221 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 10:04:31,221 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 10:04:31,252 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 10:04:31,253 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:31,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:31,277 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:31,278 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:31,567 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:31,569 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:31,569 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 21 [2018-10-22 10:04:31,569 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:31,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 10:04:31,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 10:04:31,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2018-10-22 10:04:31,570 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 14 states. [2018-10-22 10:04:31,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:31,797 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-22 10:04:31,800 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 10:04:31,800 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 17 [2018-10-22 10:04:31,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:31,801 INFO L225 Difference]: With dead ends: 25 [2018-10-22 10:04:31,801 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 10:04:31,801 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2018-10-22 10:04:31,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 10:04:31,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-22 10:04:31,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 10:04:31,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 10:04:31,806 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-22 10:04:31,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:31,806 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 10:04:31,806 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 10:04:31,806 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 10:04:31,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 10:04:31,809 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:31,809 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:31,809 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:31,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:31,810 INFO L82 PathProgramCache]: Analyzing trace with hash -159093313, now seen corresponding path program 4 times [2018-10-22 10:04:31,810 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:31,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:31,811 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:31,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:31,811 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:31,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:32,099 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:32,099 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:32,099 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:32,099 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:32,100 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:32,100 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:32,100 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 10:04:32,111 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 10:04:32,111 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 10:04:32,122 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 10:04:32,122 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:32,125 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:32,317 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:32,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:32,836 WARN L179 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2018-10-22 10:04:33,066 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 32 [2018-10-22 10:04:33,184 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:33,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:33,204 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 10:04:33,222 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 10:04:33,222 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 10:04:33,245 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 10:04:33,246 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:33,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:33,283 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:33,283 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:34,132 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:34,134 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:34,134 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 24 [2018-10-22 10:04:34,134 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:34,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 10:04:34,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 10:04:34,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2018-10-22 10:04:34,136 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 16 states. [2018-10-22 10:04:34,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:34,387 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-22 10:04:34,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 10:04:34,388 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 19 [2018-10-22 10:04:34,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:34,390 INFO L225 Difference]: With dead ends: 27 [2018-10-22 10:04:34,390 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 10:04:34,391 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=146, Invalid=666, Unknown=0, NotChecked=0, Total=812 [2018-10-22 10:04:34,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 10:04:34,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 10:04:34,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 10:04:34,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-22 10:04:34,396 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-22 10:04:34,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:34,397 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-22 10:04:34,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 10:04:34,397 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-22 10:04:34,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-22 10:04:34,397 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:34,398 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:34,399 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:34,400 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:34,400 INFO L82 PathProgramCache]: Analyzing trace with hash -809319769, now seen corresponding path program 5 times [2018-10-22 10:04:34,400 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:34,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:34,401 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:34,401 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:34,401 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:34,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:34,598 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:34,599 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:34,599 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:34,599 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:34,600 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:34,600 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:34,600 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 10:04:34,609 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 10:04:34,609 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:34,628 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 10:04:34,628 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:34,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:34,879 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:34,879 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:35,450 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 55 [2018-10-22 10:04:35,724 WARN L179 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 71 [2018-10-22 10:04:36,180 WARN L179 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 83 [2018-10-22 10:04:36,202 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:36,222 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:36,223 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 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 10:04:36,240 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 10:04:36,240 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:36,281 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 10:04:36,281 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:36,285 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:36,352 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:36,352 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:36,700 WARN L179 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2018-10-22 10:04:37,405 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:37,407 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:37,407 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 31 [2018-10-22 10:04:37,407 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:37,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 10:04:37,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 10:04:37,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=777, Unknown=0, NotChecked=0, Total=930 [2018-10-22 10:04:37,409 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 18 states. [2018-10-22 10:04:37,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:37,682 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-22 10:04:37,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 10:04:37,683 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2018-10-22 10:04:37,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:37,684 INFO L225 Difference]: With dead ends: 29 [2018-10-22 10:04:37,684 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 10:04:37,685 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 7 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 515 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=213, Invalid=1119, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 10:04:37,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 10:04:37,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-22 10:04:37,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 10:04:37,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 10:04:37,689 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-22 10:04:37,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:37,689 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 10:04:37,689 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 10:04:37,689 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 10:04:37,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 10:04:37,690 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:37,690 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:37,690 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:37,691 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:37,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1388281231, now seen corresponding path program 6 times [2018-10-22 10:04:37,691 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:37,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:37,692 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:37,692 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:37,692 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:37,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 10:04:37,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 10:04:37,752 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-22 10:04:37,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 10:04:37 BoogieIcfgContainer [2018-10-22 10:04:37,803 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 10:04:37,803 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-22 10:04:37,804 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-22 10:04:37,804 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-22 10:04:37,804 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 10:04:24" (3/4) ... [2018-10-22 10:04:37,815 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-22 10:04:37,894 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-22 10:04:37,894 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-22 10:04:37,898 INFO L168 Benchmark]: Toolchain (without parser) took 14699.82 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 241.7 MB). Free memory was 950.5 MB in the beginning and 1.0 GB in the end (delta: -80.8 MB). Peak memory consumption was 160.8 MB. Max. memory is 11.5 GB. [2018-10-22 10:04:37,899 INFO L168 Benchmark]: CDTParser took 0.41 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 10:04:37,899 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.03 ms. Allocated memory is still 1.0 GB. Free memory was 950.5 MB in the beginning and 939.7 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-22 10:04:37,901 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.99 ms. Allocated memory is still 1.0 GB. Free memory is still 939.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 10:04:37,902 INFO L168 Benchmark]: Boogie Preprocessor took 20.53 ms. Allocated memory is still 1.0 GB. Free memory is still 939.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 10:04:37,902 INFO L168 Benchmark]: RCFGBuilder took 685.91 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 75.5 MB). Free memory was 939.7 MB in the beginning and 1.0 GB in the end (delta: -109.5 MB). Peak memory consumption was 26.3 MB. Max. memory is 11.5 GB. [2018-10-22 10:04:37,903 INFO L168 Benchmark]: TraceAbstraction took 13596.60 ms. Allocated memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: 166.2 MB). Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 17.9 MB). Peak memory consumption was 184.1 MB. Max. memory is 11.5 GB. [2018-10-22 10:04:37,904 INFO L168 Benchmark]: Witness Printer took 90.86 ms. Allocated memory is still 1.3 GB. Free memory is still 1.0 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 10:04:37,909 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.41 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 273.03 ms. Allocated memory is still 1.0 GB. Free memory was 950.5 MB in the beginning and 939.7 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 23.99 ms. Allocated memory is still 1.0 GB. Free memory is still 939.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 20.53 ms. Allocated memory is still 1.0 GB. Free memory is still 939.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 685.91 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 75.5 MB). Free memory was 939.7 MB in the beginning and 1.0 GB in the end (delta: -109.5 MB). Peak memory consumption was 26.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 13596.60 ms. Allocated memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: 166.2 MB). Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 17.9 MB). Peak memory consumption was 184.1 MB. Max. memory is 11.5 GB. * Witness Printer took 90.86 ms. Allocated memory is still 1.3 GB. Free memory is still 1.0 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, j=10, n=6, n=0] [L13] COND TRUE i<=n [L14] COND TRUE i