./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loops/sum01_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_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 5cba8acfa381c990ec40e4bf9e5d202ee845a576 --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 10:04:22,882 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-22 10:04:22,884 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-22 10:04:22,896 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-22 10:04:22,897 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-22 10:04:22,898 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-22 10:04:22,899 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-22 10:04:22,901 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-22 10:04:22,903 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-22 10:04:22,904 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-22 10:04:22,905 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-22 10:04:22,905 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-22 10:04:22,906 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-22 10:04:22,907 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-22 10:04:22,909 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-22 10:04:22,910 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-22 10:04:22,911 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-22 10:04:22,913 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-22 10:04:22,915 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-22 10:04:22,917 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-22 10:04:22,918 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-22 10:04:22,920 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-22 10:04:22,922 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-22 10:04:22,923 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-22 10:04:22,923 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-22 10:04:22,924 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-22 10:04:22,926 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-22 10:04:22,927 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-22 10:04:22,928 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-22 10:04:22,929 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-22 10:04:22,929 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-22 10:04:22,930 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-22 10:04:22,931 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-22 10:04:22,931 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-22 10:04:22,932 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-22 10:04:22,933 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-22 10:04:22,933 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-22 10:04:22,950 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-22 10:04:22,950 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-22 10:04:22,951 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-22 10:04:22,951 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-22 10:04:22,952 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-22 10:04:22,952 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-22 10:04:22,952 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-22 10:04:22,952 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-22 10:04:22,952 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-22 10:04:22,952 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-22 10:04:22,953 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-22 10:04:22,953 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-22 10:04:22,953 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-22 10:04:22,954 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-22 10:04:22,955 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-22 10:04:22,955 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-22 10:04:22,955 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-22 10:04:22,955 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-22 10:04:22,956 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-22 10:04:22,956 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-22 10:04:22,956 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-22 10:04:22,956 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-22 10:04:22,956 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-22 10:04:22,956 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-22 10:04:22,958 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-22 10:04:22,958 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-22 10:04:22,958 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-22 10:04:22,958 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-22 10:04:22,959 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-22 10:04:22,959 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-22 10:04:22,959 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-22 10:04:22,959 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-22 10:04:22,959 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-22 10:04:22,959 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-22 10:04:22,959 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 -> 5cba8acfa381c990ec40e4bf9e5d202ee845a576 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock [2018-10-22 10:04:23,011 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-22 10:04:23,024 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-22 10:04:23,028 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-22 10:04:23,029 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-22 10:04:23,029 INFO L276 PluginConnector]: CDTParser initialized [2018-10-22 10:04:23,031 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/sum01_false-unreach-call_true-termination.i [2018-10-22 10:04:23,098 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/5ab6d5579/c4ee3c22d1084c89ad0584801664b1ec/FLAG094c8e0e2 [2018-10-22 10:04:23,611 INFO L298 CDTParser]: Found 1 translation units. [2018-10-22 10:04:23,614 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_false-unreach-call_true-termination.i [2018-10-22 10:04:23,621 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/5ab6d5579/c4ee3c22d1084c89ad0584801664b1ec/FLAG094c8e0e2 [2018-10-22 10:04:23,643 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/5ab6d5579/c4ee3c22d1084c89ad0584801664b1ec [2018-10-22 10:04:23,649 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-22 10:04:23,653 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-22 10:04:23,654 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-22 10:04:23,657 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-22 10:04:23,662 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-22 10:04:23,663 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,667 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79216ac2 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 10:04:23,668 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 10:04:23" (1/1) ... [2018-10-22 10:04:23,679 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-22 10:04:23,701 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-22 10:04:23,940 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 10:04:23,947 INFO L189 MainTranslator]: Completed pre-run [2018-10-22 10:04:23,967 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-22 10:04:23,986 INFO L193 MainTranslator]: Completed translation [2018-10-22 10:04:23,987 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 10:04:23 WrapperNode [2018-10-22 10:04:23,987 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-22 10:04:23,989 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-22 10:04:23,989 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-22 10:04:23,989 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-22 10:04:24,001 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 10:04:24,008 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 10:04:24,016 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-22 10:04:24,016 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-22 10:04:24,018 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-22 10:04:24,018 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-22 10:04:24,029 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 10:04:24,029 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 10:04:24,031 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 10:04:24,031 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 10:04:24,039 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 10:04:24,049 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 10:04:24,051 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 10:04:24,053 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-22 10:04:24,054 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-22 10:04:24,054 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-22 10:04:24,054 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-22 10:04:24,055 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 10:04:24,199 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-22 10:04:24,199 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-22 10:04:24,200 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-22 10:04:24,200 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-22 10:04:24,200 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-22 10:04:24,200 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-22 10:04:24,200 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-22 10:04:24,200 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-22 10:04:24,528 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-22 10:04:24,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 10:04:24 BoogieIcfgContainer [2018-10-22 10:04:24,531 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-22 10:04:24,535 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-22 10:04:24,535 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-22 10:04:24,540 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-22 10:04:24,543 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 10:04:23" (1/3) ... [2018-10-22 10:04:24,544 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37b5347c 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 10:04:24,544 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 10:04:24,545 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37b5347c 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 10:04:24,548 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 10:04:24,550 INFO L112 eAbstractionObserver]: Analyzing ICFG sum01_false-unreach-call_true-termination.i [2018-10-22 10:04:24,567 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-22 10:04:24,578 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-22 10:04:24,595 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-22 10:04:24,628 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-22 10:04:24,629 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-22 10:04:24,629 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-22 10:04:24,629 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-22 10:04:24,629 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-22 10:04:24,629 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-22 10:04:24,630 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-22 10:04:24,631 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-22 10:04:24,631 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-22 10:04:24,653 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-10-22 10:04:24,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-22 10:04:24,661 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:24,662 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:24,665 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:24,672 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:24,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-10-22 10:04:24,676 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:24,731 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,731 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:24,732 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,732 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:24,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:24,825 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 10:04:24,828 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 10:04:24,828 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-22 10:04:24,828 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 10:04:24,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-22 10:04:24,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-22 10:04:24,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-22 10:04:24,854 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-10-22 10:04:24,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:24,876 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-10-22 10:04:24,876 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-22 10:04:24,878 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-22 10:04:24,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:24,886 INFO L225 Difference]: With dead ends: 29 [2018-10-22 10:04:24,886 INFO L226 Difference]: Without dead ends: 12 [2018-10-22 10:04:24,890 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 10:04:24,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-10-22 10:04:24,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-10-22 10:04:24,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-10-22 10:04:24,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-10-22 10:04:24,927 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-10-22 10:04:24,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:24,927 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-10-22 10:04:24,927 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-22 10:04:24,927 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-10-22 10:04:24,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-22 10:04:24,928 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:24,928 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:24,929 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:24,929 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:24,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1143179357, now seen corresponding path program 1 times [2018-10-22 10:04:24,929 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:24,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,931 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:24,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:24,931 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:24,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:25,063 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 10:04:25,063 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-22 10:04:25,064 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-22 10:04:25,064 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-22 10:04:25,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-22 10:04:25,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-22 10:04:25,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-22 10:04:25,068 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2018-10-22 10:04:25,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:25,160 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-10-22 10:04:25,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-22 10:04:25,161 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-22 10:04:25,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:25,162 INFO L225 Difference]: With dead ends: 19 [2018-10-22 10:04:25,162 INFO L226 Difference]: Without dead ends: 14 [2018-10-22 10:04:25,164 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 10:04:25,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-22 10:04:25,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-22 10:04:25,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-22 10:04:25,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-10-22 10:04:25,169 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-10-22 10:04:25,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:25,169 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-10-22 10:04:25,169 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-22 10:04:25,169 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-10-22 10:04:25,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-22 10:04:25,170 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:25,170 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:25,171 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:25,171 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:25,171 INFO L82 PathProgramCache]: Analyzing trace with hash -1764172798, now seen corresponding path program 1 times [2018-10-22 10:04:25,171 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:25,172 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:25,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:25,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:25,173 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:25,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:25,609 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 10:04:25,610 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:25,610 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:25,611 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-10-22 10:04:25,613 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [11], [26], [29], [31], [37], [38], [39], [41], [45] [2018-10-22 10:04:25,659 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-22 10:04:25,660 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-22 10:04:25,769 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-22 10:04:26,180 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-22 10:04:26,181 INFO L272 AbstractInterpreter]: Visited 12 different actions 123 times. Merged at 3 different actions 48 times. Widened at 1 different actions 12 times. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-10-22 10:04:26,226 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:26,227 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-22 10:04:26,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:26,228 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 10:04:26,239 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:26,240 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 10:04:26,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:26,277 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:26,580 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 10:04:26,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:27,071 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 10:04:27,105 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:27,105 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 10:04:27,123 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:27,123 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 10:04:27,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:27,145 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:27,162 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 10:04:27,163 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:27,353 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 10:04:27,356 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:27,356 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 15 [2018-10-22 10:04:27,356 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:27,357 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-10-22 10:04:27,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-10-22 10:04:27,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2018-10-22 10:04:27,358 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2018-10-22 10:04:27,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:27,567 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-10-22 10:04:27,568 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-22 10:04:27,568 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2018-10-22 10:04:27,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:27,569 INFO L225 Difference]: With dead ends: 21 [2018-10-22 10:04:27,570 INFO L226 Difference]: Without dead ends: 16 [2018-10-22 10:04:27,573 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2018-10-22 10:04:27,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-10-22 10:04:27,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-10-22 10:04:27,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-10-22 10:04:27,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-10-22 10:04:27,580 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-10-22 10:04:27,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:27,580 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-10-22 10:04:27,580 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-10-22 10:04:27,581 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-10-22 10:04:27,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-22 10:04:27,581 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:27,582 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:27,582 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:27,582 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:27,582 INFO L82 PathProgramCache]: Analyzing trace with hash 294115943, now seen corresponding path program 2 times [2018-10-22 10:04:27,583 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:27,584 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:27,585 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:27,585 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:27,585 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:27,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:27,809 WARN L179 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2018-10-22 10:04:28,025 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 10:04:28,026 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:28,026 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:28,026 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:28,027 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:28,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:28,027 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 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 10:04:28,041 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 10:04:28,041 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:28,053 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 10:04:28,053 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:28,055 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:28,200 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 10:04:28,200 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:28,783 WARN L179 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 43 [2018-10-22 10:04:28,816 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 10:04:28,839 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:28,839 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 10:04:28,856 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 10:04:28,856 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:28,876 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 10:04:28,877 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:28,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:28,958 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 10:04:28,958 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:29,148 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 10:04:29,151 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:29,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 18 [2018-10-22 10:04:29,151 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:29,152 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-10-22 10:04:29,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-10-22 10:04:29,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2018-10-22 10:04:29,153 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 12 states. [2018-10-22 10:04:29,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:29,312 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-10-22 10:04:29,313 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-22 10:04:29,314 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2018-10-22 10:04:29,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:29,315 INFO L225 Difference]: With dead ends: 23 [2018-10-22 10:04:29,315 INFO L226 Difference]: Without dead ends: 18 [2018-10-22 10:04:29,316 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2018-10-22 10:04:29,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-22 10:04:29,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-22 10:04:29,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-22 10:04:29,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-10-22 10:04:29,320 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-10-22 10:04:29,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:29,321 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-10-22 10:04:29,321 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-10-22 10:04:29,321 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-10-22 10:04:29,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-10-22 10:04:29,322 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:29,322 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:29,322 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:29,322 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:29,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1670327412, now seen corresponding path program 3 times [2018-10-22 10:04:29,323 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:29,323 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:29,324 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:29,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:29,324 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:29,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:29,563 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 10:04:29,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:29,564 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:29,564 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:29,564 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:29,564 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:29,564 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 10:04:29,573 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 10:04:29,574 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 10:04:29,583 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 10:04:29,584 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:29,586 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:29,728 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 10:04:29,728 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:30,206 WARN L179 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 43 [2018-10-22 10:04:30,558 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 56 [2018-10-22 10:04:30,573 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 10:04:30,596 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:30,596 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 10:04:30,614 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 10:04:30,614 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 10:04:30,649 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-22 10:04:30,650 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:30,654 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:30,715 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 10:04:30,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:31,380 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 10:04:31,384 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:31,385 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 21 [2018-10-22 10:04:31,385 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:31,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-10-22 10:04:31,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-10-22 10:04:31,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2018-10-22 10:04:31,391 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 14 states. [2018-10-22 10:04:31,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:31,564 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-10-22 10:04:31,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-22 10:04:31,566 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 17 [2018-10-22 10:04:31,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:31,567 INFO L225 Difference]: With dead ends: 25 [2018-10-22 10:04:31,567 INFO L226 Difference]: Without dead ends: 20 [2018-10-22 10:04:31,568 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2018-10-22 10:04:31,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-10-22 10:04:31,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-10-22 10:04:31,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-10-22 10:04:31,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-10-22 10:04:31,572 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-10-22 10:04:31,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:31,572 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-10-22 10:04:31,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-10-22 10:04:31,572 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-10-22 10:04:31,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-22 10:04:31,573 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:31,573 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:31,573 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:31,573 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:31,574 INFO L82 PathProgramCache]: Analyzing trace with hash 285218673, now seen corresponding path program 4 times [2018-10-22 10:04:31,574 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:31,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:31,575 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:31,575 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:31,575 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:31,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:31,821 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 10:04:31,821 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:31,821 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:31,821 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:31,822 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:31,822 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:31,822 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 10:04:31,831 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 10:04:31,831 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 10:04:31,843 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 10:04:31,843 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:31,845 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:31,940 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 10:04:31,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:32,526 WARN L179 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 56 [2018-10-22 10:04:32,843 WARN L179 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 70 [2018-10-22 10:04:32,911 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 10:04:32,943 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:32,944 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 10:04:32,973 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-22 10:04:32,973 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-22 10:04:33,004 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-22 10:04:33,004 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:33,012 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:33,040 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 10:04:33,040 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:33,445 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 10:04:33,447 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:33,447 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 24 [2018-10-22 10:04:33,447 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:33,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-10-22 10:04:33,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-10-22 10:04:33,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2018-10-22 10:04:33,449 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 16 states. [2018-10-22 10:04:33,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:33,759 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-10-22 10:04:33,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-10-22 10:04:33,760 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 19 [2018-10-22 10:04:33,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:33,761 INFO L225 Difference]: With dead ends: 27 [2018-10-22 10:04:33,761 INFO L226 Difference]: Without dead ends: 22 [2018-10-22 10:04:33,763 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 56 SyntacticMatches, 6 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=155, Invalid=657, Unknown=0, NotChecked=0, Total=812 [2018-10-22 10:04:33,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-22 10:04:33,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-10-22 10:04:33,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-10-22 10:04:33,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-10-22 10:04:33,767 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-10-22 10:04:33,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:33,768 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-10-22 10:04:33,768 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-10-22 10:04:33,768 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-10-22 10:04:33,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-10-22 10:04:33,768 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:33,769 INFO L375 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:33,769 INFO L424 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:33,769 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:33,769 INFO L82 PathProgramCache]: Analyzing trace with hash -1630669290, now seen corresponding path program 5 times [2018-10-22 10:04:33,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:33,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:33,770 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:33,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:33,771 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:33,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:34,070 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 10:04:34,070 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:34,070 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:34,071 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:34,071 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:34,071 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:34,071 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 10:04:34,081 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 10:04:34,081 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:34,100 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 10:04:34,101 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:34,103 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:34,215 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 10:04:34,215 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:35,967 WARN L179 SmtUtils]: Spent 1.07 s on a formula simplification. DAG size of input: 72 DAG size of output: 56 [2018-10-22 10:04:37,478 WARN L179 SmtUtils]: Spent 1.09 s on a formula simplification. DAG size of input: 94 DAG size of output: 70 [2018-10-22 10:04:37,944 WARN L179 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 81 [2018-10-22 10:04:38,006 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 10:04:38,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:38,039 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 10:04:38,068 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-10-22 10:04:38,068 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:38,102 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-10-22 10:04:38,103 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:38,107 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:38,123 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 10:04:38,123 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:38,997 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 10:04:39,000 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:39,000 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 27 [2018-10-22 10:04:39,000 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:39,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-10-22 10:04:39,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-10-22 10:04:39,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2018-10-22 10:04:39,004 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 18 states. [2018-10-22 10:04:39,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:39,580 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-10-22 10:04:39,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-22 10:04:39,581 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2018-10-22 10:04:39,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:39,582 INFO L225 Difference]: With dead ends: 29 [2018-10-22 10:04:39,582 INFO L226 Difference]: Without dead ends: 24 [2018-10-22 10:04:39,583 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 61 SyntacticMatches, 7 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 10:04:39,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-22 10:04:39,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-22 10:04:39,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-22 10:04:39,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-10-22 10:04:39,594 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-10-22 10:04:39,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:39,595 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-10-22 10:04:39,595 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-10-22 10:04:39,595 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-10-22 10:04:39,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-22 10:04:39,597 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:39,598 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:39,598 INFO L424 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:39,598 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:39,598 INFO L82 PathProgramCache]: Analyzing trace with hash -258031749, now seen corresponding path program 6 times [2018-10-22 10:04:39,598 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:39,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:39,604 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:39,604 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:39,604 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:39,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:39,872 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:39,872 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:39,873 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:39,873 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:39,873 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:39,873 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:39,873 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 10:04:39,883 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 10:04:39,883 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 10:04:39,901 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 10:04:39,901 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:39,907 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:40,114 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:40,114 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:40,510 WARN L179 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 56 [2018-10-22 10:04:40,772 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 70 [2018-10-22 10:04:41,072 WARN L179 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 81 [2018-10-22 10:04:41,441 WARN L179 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 95 [2018-10-22 10:04:41,457 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:41,477 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:41,477 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 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 10:04:41,494 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-10-22 10:04:41,494 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-10-22 10:04:41,544 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-10-22 10:04:41,544 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:41,549 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:41,572 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:41,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:42,157 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:42,159 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:42,159 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-10-22 10:04:42,159 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:42,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-10-22 10:04:42,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-10-22 10:04:42,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2018-10-22 10:04:42,162 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 20 states. [2018-10-22 10:04:42,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:42,510 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-10-22 10:04:42,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-10-22 10:04:42,510 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 23 [2018-10-22 10:04:42,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:42,511 INFO L225 Difference]: With dead ends: 31 [2018-10-22 10:04:42,511 INFO L226 Difference]: Without dead ends: 26 [2018-10-22 10:04:42,512 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 66 SyntacticMatches, 8 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=255, Invalid=1077, Unknown=0, NotChecked=0, Total=1332 [2018-10-22 10:04:42,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-22 10:04:42,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-10-22 10:04:42,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-10-22 10:04:42,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-10-22 10:04:42,518 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-10-22 10:04:42,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:42,518 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-10-22 10:04:42,518 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-10-22 10:04:42,518 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-10-22 10:04:42,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-22 10:04:42,519 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:42,519 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:42,519 INFO L424 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:42,519 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:42,520 INFO L82 PathProgramCache]: Analyzing trace with hash 291685280, now seen corresponding path program 7 times [2018-10-22 10:04:42,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:42,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:42,524 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:42,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:42,524 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:42,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:42,737 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:42,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:42,737 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:42,737 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:42,737 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:42,737 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:42,737 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 10:04:42,748 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:42,748 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 10:04:42,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:42,765 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:42,990 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:42,990 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:43,819 WARN L179 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 56 [2018-10-22 10:04:44,150 WARN L179 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 70 [2018-10-22 10:04:44,565 WARN L179 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 81 [2018-10-22 10:04:44,925 WARN L179 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 95 [2018-10-22 10:04:45,517 WARN L179 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 108 [2018-10-22 10:04:45,596 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:45,628 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:45,629 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 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 10:04:45,657 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:45,658 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-22 10:04:45,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:45,686 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:45,705 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:45,705 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:46,450 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:46,452 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:46,452 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 33 [2018-10-22 10:04:46,453 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:46,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-10-22 10:04:46,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-10-22 10:04:46,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2018-10-22 10:04:46,456 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 22 states. [2018-10-22 10:04:46,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:46,775 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-10-22 10:04:46,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-10-22 10:04:46,776 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 25 [2018-10-22 10:04:46,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:46,777 INFO L225 Difference]: With dead ends: 33 [2018-10-22 10:04:46,777 INFO L226 Difference]: Without dead ends: 28 [2018-10-22 10:04:46,778 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 71 SyntacticMatches, 9 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 653 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=302, Invalid=1338, Unknown=0, NotChecked=0, Total=1640 [2018-10-22 10:04:46,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-10-22 10:04:46,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-10-22 10:04:46,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-10-22 10:04:46,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-10-22 10:04:46,783 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-10-22 10:04:46,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:46,784 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-10-22 10:04:46,784 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-10-22 10:04:46,784 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-10-22 10:04:46,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-22 10:04:46,785 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:46,785 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:46,785 INFO L424 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:46,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:46,786 INFO L82 PathProgramCache]: Analyzing trace with hash 288772741, now seen corresponding path program 8 times [2018-10-22 10:04:46,786 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:46,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:46,787 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-22 10:04:46,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:46,787 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:46,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:47,072 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:47,072 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:47,073 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:47,073 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:47,073 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:47,073 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:47,073 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 10:04:47,083 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 10:04:47,083 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:47,119 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 10:04:47,119 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:47,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:47,434 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:47,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:48,618 WARN L179 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 56 [2018-10-22 10:04:48,851 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 70 [2018-10-22 10:04:49,162 WARN L179 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 81 [2018-10-22 10:04:49,575 WARN L179 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 95 [2018-10-22 10:04:50,022 WARN L179 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 108 [2018-10-22 10:04:50,764 WARN L179 SmtUtils]: Spent 421.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 122 [2018-10-22 10:04:50,786 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:50,807 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:50,807 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 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 10:04:50,824 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-22 10:04:50,824 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-22 10:04:50,856 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-22 10:04:50,856 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:50,861 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:50,880 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:50,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:52,077 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:52,080 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:52,081 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 36 [2018-10-22 10:04:52,081 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:52,082 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-10-22 10:04:52,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-10-22 10:04:52,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1026, Unknown=0, NotChecked=0, Total=1260 [2018-10-22 10:04:52,084 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 24 states. [2018-10-22 10:04:52,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:52,591 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-10-22 10:04:52,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-10-22 10:04:52,592 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 27 [2018-10-22 10:04:52,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:52,593 INFO L225 Difference]: With dead ends: 35 [2018-10-22 10:04:52,594 INFO L226 Difference]: Without dead ends: 30 [2018-10-22 10:04:52,595 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 76 SyntacticMatches, 10 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 809 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=346, Invalid=1634, Unknown=0, NotChecked=0, Total=1980 [2018-10-22 10:04:52,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-22 10:04:52,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-22 10:04:52,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-22 10:04:52,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-10-22 10:04:52,600 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-10-22 10:04:52,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:52,600 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-10-22 10:04:52,600 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-10-22 10:04:52,600 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-10-22 10:04:52,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-10-22 10:04:52,601 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:52,601 INFO L375 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:52,601 INFO L424 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:52,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:52,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1784790058, now seen corresponding path program 9 times [2018-10-22 10:04:52,602 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:52,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:52,603 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:52,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:52,603 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:52,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-22 10:04:52,935 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:52,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:52,936 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-22 10:04:52,936 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-22 10:04:52,936 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-22 10:04:52,936 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:52,937 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-22 10:04:52,945 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 10:04:52,946 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 10:04:52,965 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 10:04:52,965 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:52,968 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:53,155 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:53,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:53,612 WARN L179 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 56 [2018-10-22 10:04:53,864 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 70 [2018-10-22 10:04:54,195 WARN L179 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 81 [2018-10-22 10:04:54,648 WARN L179 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 95 [2018-10-22 10:04:55,071 WARN L179 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 108 [2018-10-22 10:04:55,581 WARN L179 SmtUtils]: Spent 329.00 ms on a formula simplification. DAG size of input: 178 DAG size of output: 122 [2018-10-22 10:04:56,157 WARN L179 SmtUtils]: Spent 370.00 ms on a formula simplification. DAG size of input: 199 DAG size of output: 135 [2018-10-22 10:04:56,183 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:56,208 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-22 10:04:56,208 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 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-22 10:04:56,226 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-22 10:04:56,227 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-22 10:04:56,317 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-10-22 10:04:56,317 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-22 10:04:56,321 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-22 10:04:56,334 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:56,334 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-22 10:04:57,936 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-22 10:04:57,939 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-22 10:04:57,939 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 39 [2018-10-22 10:04:57,939 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-22 10:04:57,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-10-22 10:04:57,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-10-22 10:04:57,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=1221, Unknown=0, NotChecked=0, Total=1482 [2018-10-22 10:04:57,941 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 26 states. [2018-10-22 10:04:58,709 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2018-10-22 10:04:58,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-22 10:04:58,879 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-10-22 10:04:58,880 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-10-22 10:04:58,880 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 29 [2018-10-22 10:04:58,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-22 10:04:58,882 INFO L225 Difference]: With dead ends: 37 [2018-10-22 10:04:58,882 INFO L226 Difference]: Without dead ends: 32 [2018-10-22 10:04:58,884 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 81 SyntacticMatches, 11 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=387, Invalid=1965, Unknown=0, NotChecked=0, Total=2352 [2018-10-22 10:04:58,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-10-22 10:04:58,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-10-22 10:04:58,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-10-22 10:04:58,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-10-22 10:04:58,888 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-10-22 10:04:58,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-22 10:04:58,889 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-10-22 10:04:58,889 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-10-22 10:04:58,889 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-10-22 10:04:58,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-22 10:04:58,890 INFO L367 BasicCegarLoop]: Found error trace [2018-10-22 10:04:58,890 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-22 10:04:58,890 INFO L424 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-22 10:04:58,890 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-22 10:04:58,890 INFO L82 PathProgramCache]: Analyzing trace with hash 643387535, now seen corresponding path program 10 times [2018-10-22 10:04:58,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-22 10:04:58,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:58,891 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-22 10:04:58,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-22 10:04:58,892 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-22 10:04:58,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 10:04:58,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-22 10:04:58,938 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-22 10:04:58,994 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 10:04:58 BoogieIcfgContainer [2018-10-22 10:04:58,997 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-22 10:04:58,997 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-22 10:04:58,998 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-22 10:04:58,998 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-22 10:04:58,998 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 10:04:59,005 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-22 10:04:59,082 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-22 10:04:59,085 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-22 10:04:59,086 INFO L168 Benchmark]: Toolchain (without parser) took 35436.68 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 418.9 MB). Free memory was 951.8 MB in the beginning and 1.2 GB in the end (delta: -251.8 MB). Peak memory consumption was 167.1 MB. Max. memory is 11.5 GB. [2018-10-22 10:04:59,087 INFO L168 Benchmark]: CDTParser took 0.23 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 10:04:59,088 INFO L168 Benchmark]: CACSL2BoogieTranslator took 333.34 ms. Allocated memory is still 1.0 GB. Free memory was 951.8 MB in the beginning and 941.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-22 10:04:59,088 INFO L168 Benchmark]: Boogie Procedure Inliner took 27.47 ms. Allocated memory is still 1.0 GB. Free memory is still 941.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 10:04:59,089 INFO L168 Benchmark]: Boogie Preprocessor took 36.56 ms. Allocated memory is still 1.0 GB. Free memory is still 941.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 10:04:59,089 INFO L168 Benchmark]: RCFGBuilder took 477.49 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 129.0 MB). Free memory was 941.1 MB in the beginning and 1.1 GB in the end (delta: -166.4 MB). Peak memory consumption was 26.5 MB. Max. memory is 11.5 GB. [2018-10-22 10:04:59,090 INFO L168 Benchmark]: TraceAbstraction took 34461.86 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 289.9 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -96.1 MB). Peak memory consumption was 193.8 MB. Max. memory is 11.5 GB. [2018-10-22 10:04:59,090 INFO L168 Benchmark]: Witness Printer took 87.44 ms. Allocated memory is still 1.4 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-22 10:04:59,094 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 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 333.34 ms. Allocated memory is still 1.0 GB. Free memory was 951.8 MB in the beginning and 941.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 27.47 ms. Allocated memory is still 1.0 GB. Free memory is still 941.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 36.56 ms. Allocated memory is still 1.0 GB. Free memory is still 941.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 477.49 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 129.0 MB). Free memory was 941.1 MB in the beginning and 1.1 GB in the end (delta: -166.4 MB). Peak memory consumption was 26.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 34461.86 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 289.9 MB). Free memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: -96.1 MB). Peak memory consumption was 193.8 MB. Max. memory is 11.5 GB. * Witness Printer took 87.44 ms. Allocated memory is still 1.4 GB. Free memory is still 1.2 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, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, n=0, n=10] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=2, n=2, n=10] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=3, n=4, n=10] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=4, n=10, n=6] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=5, n=8, n=10] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=6, n=10, n=10] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=7, n=12, n=10] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=8, n=10, n=14] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=9, n=16, n=10] [L13] COND TRUE i<=n [L14] COND TRUE i<10 [L15] sn = sn + (2) [L13] i++ VAL [i=10, n=10, n=18] [L13] COND TRUE i<=n [L14] COND FALSE !(i<10) [L13] i++ VAL [i=11, n=10, n=18] [L13] COND FALSE !(i<=n) VAL [i=11, n=18, n=10] [L17] CALL __VERIFIER_assert(sn==n*(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, 34.3s OverallTime, 12 OverallIterations, 11 TraceHistogramMax, 3.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 154 SDtfs, 23 SDslu, 1281 SDs, 0 SdLazy, 956 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 899 GetRequests, 553 SyntacticMatches, 63 SemanticMatches, 283 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4007 ImplicationChecksByTransitivity, 28.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.6s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 11 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 28.3s InterpolantComputationTime, 619 NumberOfCodeBlocks, 619 NumberOfCodeBlocksAsserted, 82 NumberOfCheckSat, 919 ConstructedInterpolants, 180 QuantifiedInterpolants, 683801 SizeOfPredicates, 72 NumberOfNonLiveVariables, 936 ConjunctsInSsa, 468 ConjunctsInUnsatCore, 47 InterpolantComputations, 2 PerfectInterpolantSequences, 0/1650 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...