./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loops/sum04_false-unreach-call_true-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0210da8c Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/TaipanReach.xml -i ../../../trunk/examples/svcomp/loops/sum04_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 aeade23d65797ff650f62ff8e383f015764d9ed2 ..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 [2018-10-21 12:24:38,505 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-21 12:24:38,507 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-21 12:24:38,525 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-21 12:24:38,525 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-21 12:24:38,526 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-21 12:24:38,527 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-21 12:24:38,529 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-21 12:24:38,530 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-21 12:24:38,531 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-21 12:24:38,532 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-21 12:24:38,533 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-21 12:24:38,534 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-21 12:24:38,535 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-21 12:24:38,536 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-21 12:24:38,537 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-21 12:24:38,538 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-21 12:24:38,540 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-21 12:24:38,542 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-21 12:24:38,544 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-21 12:24:38,545 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-21 12:24:38,546 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-21 12:24:38,549 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-21 12:24:38,549 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-21 12:24:38,550 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-21 12:24:38,550 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-21 12:24:38,551 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-21 12:24:38,553 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-21 12:24:38,554 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-21 12:24:38,555 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-21 12:24:38,555 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-21 12:24:38,556 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-21 12:24:38,557 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-21 12:24:38,557 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-21 12:24:38,558 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-21 12:24:38,559 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-21 12:24:38,560 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-21 12:24:38,593 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-21 12:24:38,593 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-21 12:24:38,594 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-21 12:24:38,594 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-21 12:24:38,595 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-21 12:24:38,596 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-21 12:24:38,596 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-21 12:24:38,596 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-21 12:24:38,596 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-21 12:24:38,596 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-21 12:24:38,597 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-21 12:24:38,597 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-21 12:24:38,598 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-21 12:24:38,600 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-21 12:24:38,600 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-21 12:24:38,600 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-21 12:24:38,600 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-21 12:24:38,600 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-21 12:24:38,601 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-21 12:24:38,603 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-21 12:24:38,603 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-21 12:24:38,603 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-21 12:24:38,603 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-21 12:24:38,603 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-21 12:24:38,604 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-21 12:24:38,605 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-21 12:24:38,605 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:24:38,605 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-21 12:24:38,605 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-21 12:24:38,606 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-21 12:24:38,606 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-21 12:24:38,607 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-21 12:24:38,607 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-21 12:24:38,607 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-21 12:24:38,607 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 -> aeade23d65797ff650f62ff8e383f015764d9ed2 [2018-10-21 12:24:38,688 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-21 12:24:38,708 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-21 12:24:38,713 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-21 12:24:38,714 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-21 12:24:38,715 INFO L276 PluginConnector]: CDTParser initialized [2018-10-21 12:24:38,716 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/sum04_false-unreach-call_true-termination.i [2018-10-21 12:24:38,778 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3a6f39387/500c401682ea4efb8c8a1093fbc2b124/FLAG67803dad9 [2018-10-21 12:24:39,281 INFO L298 CDTParser]: Found 1 translation units. [2018-10-21 12:24:39,282 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04_false-unreach-call_true-termination.i [2018-10-21 12:24:39,289 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3a6f39387/500c401682ea4efb8c8a1093fbc2b124/FLAG67803dad9 [2018-10-21 12:24:39,304 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/3a6f39387/500c401682ea4efb8c8a1093fbc2b124 [2018-10-21 12:24:39,309 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-21 12:24:39,311 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-21 12:24:39,312 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-21 12:24:39,312 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-21 12:24:39,316 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-21 12:24:39,317 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,321 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bec4742 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39, skipping insertion in model container [2018-10-21 12:24:39,321 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,332 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-21 12:24:39,354 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-21 12:24:39,581 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:24:39,587 INFO L189 MainTranslator]: Completed pre-run [2018-10-21 12:24:39,607 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:24:39,626 INFO L193 MainTranslator]: Completed translation [2018-10-21 12:24:39,626 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39 WrapperNode [2018-10-21 12:24:39,626 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-21 12:24:39,628 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-21 12:24:39,628 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-21 12:24:39,628 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-21 12:24:39,639 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,645 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,652 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-21 12:24:39,653 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-21 12:24:39,653 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-21 12:24:39,653 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-21 12:24:39,664 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,664 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,664 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,665 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,668 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,674 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,676 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... [2018-10-21 12:24:39,677 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-21 12:24:39,678 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-21 12:24:39,679 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-21 12:24:39,679 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-21 12:24:39,680 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:24:39,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-21 12:24:39,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-21 12:24:39,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-21 12:24:39,799 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-21 12:24:39,800 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-21 12:24:39,800 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-21 12:24:39,800 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-21 12:24:39,800 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-21 12:24:39,995 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-21 12:24:39,996 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:24:39 BoogieIcfgContainer [2018-10-21 12:24:39,996 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-21 12:24:39,997 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-21 12:24:39,997 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-21 12:24:40,001 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-21 12:24:40,001 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.10 12:24:39" (1/3) ... [2018-10-21 12:24:40,002 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d0c9cb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:24:40, skipping insertion in model container [2018-10-21 12:24:40,002 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:24:39" (2/3) ... [2018-10-21 12:24:40,003 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d0c9cb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:24:40, skipping insertion in model container [2018-10-21 12:24:40,004 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:24:39" (3/3) ... [2018-10-21 12:24:40,006 INFO L112 eAbstractionObserver]: Analyzing ICFG sum04_false-unreach-call_true-termination.i [2018-10-21 12:24:40,016 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-21 12:24:40,023 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-21 12:24:40,039 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-21 12:24:40,071 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-21 12:24:40,072 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-21 12:24:40,072 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-21 12:24:40,072 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-21 12:24:40,072 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-21 12:24:40,072 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-21 12:24:40,072 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-21 12:24:40,072 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-21 12:24:40,073 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-21 12:24:40,097 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-21 12:24:40,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-21 12:24:40,106 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:24:40,107 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:24:40,109 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:24:40,117 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:40,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-21 12:24:40,120 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:24:40,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:40,163 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:24:40,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:40,163 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:24:40,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:40,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:40,226 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:24:40,226 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-21 12:24:40,227 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:24:40,232 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-21 12:24:40,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-21 12:24:40,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:24:40,251 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-10-21 12:24:40,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:24:40,273 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-10-21 12:24:40,274 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-21 12:24:40,276 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-21 12:24:40,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:24:40,285 INFO L225 Difference]: With dead ends: 31 [2018-10-21 12:24:40,285 INFO L226 Difference]: Without dead ends: 14 [2018-10-21 12:24:40,289 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:24:40,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-21 12:24:40,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-21 12:24:40,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-21 12:24:40,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-10-21 12:24:40,328 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-10-21 12:24:40,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:24:40,328 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-10-21 12:24:40,328 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-21 12:24:40,328 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-10-21 12:24:40,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-21 12:24:40,330 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:24:40,330 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:24:40,330 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:24:40,331 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:40,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1143179357, now seen corresponding path program 1 times [2018-10-21 12:24:40,331 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:24:40,332 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:40,333 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:24:40,333 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:40,333 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:24:40,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:40,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:40,421 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:24:40,421 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-10-21 12:24:40,421 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:24:40,424 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-10-21 12:24:40,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-10-21 12:24:40,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:24:40,425 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2018-10-21 12:24:40,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:24:40,544 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-10-21 12:24:40,545 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-10-21 12:24:40,545 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-10-21 12:24:40,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:24:40,546 INFO L225 Difference]: With dead ends: 27 [2018-10-21 12:24:40,546 INFO L226 Difference]: Without dead ends: 18 [2018-10-21 12:24:40,548 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-10-21 12:24:40,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-21 12:24:40,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-21 12:24:40,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-21 12:24:40,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-10-21 12:24:40,554 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-10-21 12:24:40,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:24:40,554 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-10-21 12:24:40,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-10-21 12:24:40,555 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-10-21 12:24:40,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-21 12:24:40,556 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:24:40,557 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:24:40,561 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:24:40,561 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:40,562 INFO L82 PathProgramCache]: Analyzing trace with hash -1652058138, now seen corresponding path program 1 times [2018-10-21 12:24:40,562 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:24:40,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:40,563 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:24:40,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:40,564 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:24:40,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:40,648 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:40,649 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:40,649 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:24:40,650 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-21 12:24:40,653 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [16], [20], [26], [29], [31], [37], [38], [39], [41] [2018-10-21 12:24:40,697 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:24:40,698 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:24:40,951 INFO L266 AbstractInterpreter]: Error location(s) were unreachable [2018-10-21 12:24:40,955 INFO L272 AbstractInterpreter]: Visited 10 different actions 65 times. Merged at 4 different actions 44 times. Widened at 1 different actions 7 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables. [2018-10-21 12:24:40,967 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:40,967 INFO L398 sIntCurrentIteration]: Generating AbsInt predicates [2018-10-21 12:24:41,022 INFO L224 lantSequenceWeakener]: Could never weaken! [2018-10-21 12:24:41,022 INFO L411 sIntCurrentIteration]: Unifying AI predicates [2018-10-21 12:24:41,061 INFO L422 sIntCurrentIteration]: Finished generation of AbsInt predicates [2018-10-21 12:24:41,062 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-10-21 12:24:41,063 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2018-10-21 12:24:41,063 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:24:41,063 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-21 12:24:41,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-21 12:24:41,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-21 12:24:41,064 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2018-10-21 12:24:41,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:24:41,234 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-10-21 12:24:41,234 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-21 12:24:41,234 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2018-10-21 12:24:41,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:24:41,235 INFO L225 Difference]: With dead ends: 27 [2018-10-21 12:24:41,235 INFO L226 Difference]: Without dead ends: 22 [2018-10-21 12:24:41,236 INFO L605 BasicCegarLoop]: 2 DeclaredPredicates, 14 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-10-21 12:24:41,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-21 12:24:41,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-21 12:24:41,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-21 12:24:41,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2018-10-21 12:24:41,242 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2018-10-21 12:24:41,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:24:41,242 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2018-10-21 12:24:41,242 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-21 12:24:41,242 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2018-10-21 12:24:41,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-21 12:24:41,243 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:24:41,244 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:24:41,244 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:24:41,244 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:41,244 INFO L82 PathProgramCache]: Analyzing trace with hash 1335432365, now seen corresponding path program 1 times [2018-10-21 12:24:41,244 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:24:41,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:41,246 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:24:41,246 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:41,246 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:24:41,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:41,312 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:41,312 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:41,313 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:24:41,313 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-21 12:24:41,313 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [13], [16], [18], [20], [26], [29], [31], [37], [38], [39], [41] [2018-10-21 12:24:41,315 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:24:41,315 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:24:41,548 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-21 12:24:41,549 INFO L272 AbstractInterpreter]: Visited 15 different actions 138 times. Merged at 6 different actions 75 times. Widened at 1 different actions 11 times. Found 14 fixpoints after 4 different actions. Largest state had 3 variables. [2018-10-21 12:24:41,589 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:41,590 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-21 12:24:41,590 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:41,591 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:24:41,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:24:41,603 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:24:41,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:41,645 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:24:41,669 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:41,669 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:24:41,736 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:41,765 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:41,765 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:24:41,783 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:24:41,783 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:24:41,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:41,803 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:24:41,810 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:41,814 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:24:41,846 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:41,853 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:24:41,853 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 5 [2018-10-21 12:24:41,853 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:24:41,854 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-10-21 12:24:41,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-10-21 12:24:41,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-21 12:24:41,856 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2018-10-21 12:24:41,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:24:41,998 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2018-10-21 12:24:41,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-10-21 12:24:41,998 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2018-10-21 12:24:41,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:24:41,999 INFO L225 Difference]: With dead ends: 35 [2018-10-21 12:24:41,999 INFO L226 Difference]: Without dead ends: 26 [2018-10-21 12:24:42,000 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2018-10-21 12:24:42,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-21 12:24:42,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-10-21 12:24:42,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-21 12:24:42,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-10-21 12:24:42,007 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 19 [2018-10-21 12:24:42,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:24:42,009 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-10-21 12:24:42,010 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-10-21 12:24:42,010 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-10-21 12:24:42,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-21 12:24:42,011 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:24:42,011 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:24:42,012 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:24:42,012 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:42,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1612548918, now seen corresponding path program 2 times [2018-10-21 12:24:42,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:24:42,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:42,016 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:24:42,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:42,016 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:24:42,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:42,181 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:42,185 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:42,185 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:24:42,185 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:24:42,185 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:24:42,186 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:42,186 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:24:42,200 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:24:42,201 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:24:42,235 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:24:42,235 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:24:42,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:24:42,348 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:42,349 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:24:42,463 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:42,492 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:42,493 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:24:42,517 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:24:42,518 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:24:42,541 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:24:42,541 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:24:42,545 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:24:42,559 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:42,560 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:24:42,667 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:42,673 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:24:42,673 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6, 5, 5] total 10 [2018-10-21 12:24:42,673 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:24:42,674 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-21 12:24:42,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-21 12:24:42,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:24:42,675 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 8 states. [2018-10-21 12:24:42,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:24:42,777 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2018-10-21 12:24:42,777 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-21 12:24:42,778 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2018-10-21 12:24:42,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:24:42,780 INFO L225 Difference]: With dead ends: 51 [2018-10-21 12:24:42,780 INFO L226 Difference]: Without dead ends: 42 [2018-10-21 12:24:42,782 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 81 SyntacticMatches, 6 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:24:42,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-21 12:24:42,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2018-10-21 12:24:42,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-10-21 12:24:42,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2018-10-21 12:24:42,789 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 23 [2018-10-21 12:24:42,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:24:42,790 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2018-10-21 12:24:42,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-21 12:24:42,790 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2018-10-21 12:24:42,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-10-21 12:24:42,791 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:24:42,791 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:24:42,791 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:24:42,792 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:42,792 INFO L82 PathProgramCache]: Analyzing trace with hash -1955042739, now seen corresponding path program 3 times [2018-10-21 12:24:42,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:24:42,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:42,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:24:42,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:42,793 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:24:42,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:42,916 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:42,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:42,917 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:24:42,917 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:24:42,917 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:24:42,917 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:42,917 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:24:42,937 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:24:42,937 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:24:43,037 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-21 12:24:43,037 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:24:43,043 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:24:43,149 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 41 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-21 12:24:43,151 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:24:43,433 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 41 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-21 12:24:43,453 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:43,454 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:24:43,470 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:24:43,470 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:24:43,505 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-10-21 12:24:43,505 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:24:43,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:24:43,530 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 41 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-21 12:24:43,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:24:43,627 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 41 proven. 21 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-21 12:24:43,629 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:24:43,630 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7, 7, 7] total 10 [2018-10-21 12:24:43,630 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:24:43,630 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-21 12:24:43,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-21 12:24:43,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:24:43,631 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 9 states. [2018-10-21 12:24:43,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:24:43,718 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2018-10-21 12:24:43,719 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-21 12:24:43,719 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2018-10-21 12:24:43,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:24:43,720 INFO L225 Difference]: With dead ends: 47 [2018-10-21 12:24:43,721 INFO L226 Difference]: Without dead ends: 42 [2018-10-21 12:24:43,722 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 129 SyntacticMatches, 10 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:24:43,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-10-21 12:24:43,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2018-10-21 12:24:43,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-10-21 12:24:43,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2018-10-21 12:24:43,729 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 35 [2018-10-21 12:24:43,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:24:43,731 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2018-10-21 12:24:43,731 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-21 12:24:43,731 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2018-10-21 12:24:43,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-10-21 12:24:43,732 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:24:43,732 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:24:43,733 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:24:43,733 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:43,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1518099348, now seen corresponding path program 4 times [2018-10-21 12:24:43,733 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:24:43,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:43,736 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:24:43,736 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:43,737 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:24:43,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:24:44,026 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:44,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:44,026 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:24:44,027 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:24:44,027 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:24:44,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:44,027 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:24:44,037 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:24:44,037 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:24:44,058 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:24:44,058 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:24:44,060 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:24:44,072 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:44,072 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:24:44,187 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:44,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:24:44,208 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:24:44,224 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:24:44,224 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:24:44,245 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:24:44,245 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:24:44,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:24:44,259 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:44,260 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:24:44,381 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:24:44,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:24:44,384 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 10 [2018-10-21 12:24:44,384 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:24:44,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-21 12:24:44,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-21 12:24:44,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:24:44,385 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 10 states. [2018-10-21 12:24:44,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:24:44,495 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-10-21 12:24:44,498 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-21 12:24:44,499 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 39 [2018-10-21 12:24:44,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:24:44,500 INFO L225 Difference]: With dead ends: 49 [2018-10-21 12:24:44,501 INFO L226 Difference]: Without dead ends: 44 [2018-10-21 12:24:44,502 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 142 SyntacticMatches, 14 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:24:44,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-10-21 12:24:44,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-10-21 12:24:44,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-10-21 12:24:44,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2018-10-21 12:24:44,508 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 39 [2018-10-21 12:24:44,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:24:44,509 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2018-10-21 12:24:44,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-21 12:24:44,509 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2018-10-21 12:24:44,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-21 12:24:44,510 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:24:44,510 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:24:44,510 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:24:44,511 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:24:44,511 INFO L82 PathProgramCache]: Analyzing trace with hash 940069211, now seen corresponding path program 5 times [2018-10-21 12:24:44,511 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:24:44,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:44,512 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:24:44,512 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:24:44,512 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:24:44,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-21 12:24:44,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-21 12:24:44,547 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-21 12:24:44,570 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.10 12:24:44 BoogieIcfgContainer [2018-10-21 12:24:44,570 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-21 12:24:44,571 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-21 12:24:44,571 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-21 12:24:44,571 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-21 12:24:44,572 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:24:39" (3/4) ... [2018-10-21 12:24:44,574 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-21 12:24:44,629 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-21 12:24:44,631 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-21 12:24:44,632 INFO L168 Benchmark]: Toolchain (without parser) took 5322.59 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.8 MB). Free memory was 949.7 MB in the beginning and 868.5 MB in the end (delta: 81.2 MB). Peak memory consumption was 228.0 MB. Max. memory is 11.5 GB. [2018-10-21 12:24:44,636 INFO L168 Benchmark]: CDTParser took 0.54 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:24:44,636 INFO L168 Benchmark]: CACSL2BoogieTranslator took 315.32 ms. Allocated memory is still 1.0 GB. Free memory was 949.7 MB in the beginning and 939.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-21 12:24:44,637 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.58 ms. Allocated memory is still 1.0 GB. Free memory is still 939.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:24:44,637 INFO L168 Benchmark]: Boogie Preprocessor took 24.74 ms. Allocated memory is still 1.0 GB. Free memory is still 939.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:24:44,638 INFO L168 Benchmark]: RCFGBuilder took 317.90 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.8 MB). Free memory was 939.0 MB in the beginning and 1.1 GB in the end (delta: -192.7 MB). Peak memory consumption was 25.4 MB. Max. memory is 11.5 GB. [2018-10-21 12:24:44,638 INFO L168 Benchmark]: TraceAbstraction took 4573.55 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 868.5 MB in the end (delta: 263.1 MB). Peak memory consumption was 263.1 MB. Max. memory is 11.5 GB. [2018-10-21 12:24:44,641 INFO L168 Benchmark]: Witness Printer took 60.09 ms. Allocated memory is still 1.2 GB. Free memory is still 868.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:24:44,650 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.54 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 315.32 ms. Allocated memory is still 1.0 GB. Free memory was 949.7 MB in the beginning and 939.0 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 24.58 ms. Allocated memory is still 1.0 GB. Free memory is still 939.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 24.74 ms. Allocated memory is still 1.0 GB. Free memory is still 939.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 317.90 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.8 MB). Free memory was 939.0 MB in the beginning and 1.1 GB in the end (delta: -192.7 MB). Peak memory consumption was 25.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 4573.55 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 868.5 MB in the end (delta: 263.1 MB). Peak memory consumption was 263.1 MB. Max. memory is 11.5 GB. * Witness Printer took 60.09 ms. Allocated memory is still 1.2 GB. Free memory is still 868.5 MB. 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, sn=0; [L13] i=1 VAL [i=1, sn=0] [L13] COND TRUE i<=8 VAL [i=1, sn=0] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=1, sn=2] [L13] i++ VAL [i=2, sn=2] [L13] COND TRUE i<=8 VAL [i=2, sn=2] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=2, sn=4] [L13] i++ VAL [i=3, sn=4] [L13] COND TRUE i<=8 VAL [i=3, sn=4] [L14] COND TRUE i<4 [L15] sn = sn + (2) VAL [i=3, sn=6] [L13] i++ VAL [i=4, sn=6] [L13] COND TRUE i<=8 VAL [i=4, sn=6] [L14] COND FALSE !(i<4) VAL [i=4, sn=6] [L13] i++ VAL [i=5, sn=6] [L13] COND TRUE i<=8 VAL [i=5, sn=6] [L14] COND FALSE !(i<4) VAL [i=5, sn=6] [L13] i++ VAL [i=6, sn=6] [L13] COND TRUE i<=8 VAL [i=6, sn=6] [L14] COND FALSE !(i<4) VAL [i=6, sn=6] [L13] i++ VAL [i=7, sn=6] [L13] COND TRUE i<=8 VAL [i=7, sn=6] [L14] COND FALSE !(i<4) VAL [i=7, sn=6] [L13] i++ VAL [i=8, sn=6] [L13] COND TRUE i<=8 VAL [i=8, sn=6] [L14] COND FALSE !(i<4) VAL [i=8, sn=6] [L13] i++ VAL [i=9, sn=6] [L13] COND FALSE !(i<=8) VAL [i=9, sn=6] [L17] CALL __VERIFIER_assert(sn==8*(2) || sn == 0) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 4.5s OverallTime, 8 OverallIterations, 9 TraceHistogramMax, 0.8s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 89 SDtfs, 64 SDslu, 138 SDs, 0 SdLazy, 117 SolverSat, 25 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 2 DeclaredPredicates, 503 GetRequests, 441 SyntacticMatches, 32 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 1.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=44occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 2 AbstIntIterations, 1 AbstIntStrong, 0.9761904761904763 AbsIntWeakeningRatio, 0.35714285714285715 AbsIntAvgWeakeningVarsNumRemoved, 0.0 AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 11 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.0s InterpolantComputationTime, 427 NumberOfCodeBlocks, 417 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 593 ConstructedInterpolants, 0 QuantifiedInterpolants, 38553 SizeOfPredicates, 9 NumberOfNonLiveVariables, 394 ConjunctsInSsa, 45 ConjunctsInUnsatCore, 23 InterpolantComputations, 2 PerfectInterpolantSequences, 269/982 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...