./Ultimate.py --spec ../../../trunk/examples/svcomp/ReachSafety.prp --file ../../../trunk/examples/svcomp/loops/n.c11_true-unreach-call_false-termination.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0210da8c Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/TaipanReach.xml -i ../../../trunk/examples/svcomp/loops/n.c11_true-unreach-call_false-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 24b22c477e8a47eac290a2fc1c5b1e1aaa3a4fa4 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.1.23-0210da8 [2018-10-21 12:28:27,886 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-21 12:28:27,889 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-21 12:28:27,908 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-21 12:28:27,909 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-21 12:28:27,911 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-21 12:28:27,914 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-21 12:28:27,917 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-21 12:28:27,920 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-21 12:28:27,921 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-21 12:28:27,923 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-21 12:28:27,924 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-21 12:28:27,925 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-21 12:28:27,928 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-21 12:28:27,930 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-21 12:28:27,931 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-21 12:28:27,933 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-21 12:28:27,936 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-21 12:28:27,939 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-21 12:28:27,941 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-21 12:28:27,943 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-21 12:28:27,946 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-21 12:28:27,949 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-21 12:28:27,950 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-21 12:28:27,951 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-21 12:28:27,953 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-21 12:28:27,954 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-21 12:28:27,956 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-21 12:28:27,958 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-21 12:28:27,959 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-21 12:28:27,960 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-21 12:28:27,961 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-21 12:28:27,962 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-21 12:28:27,962 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-21 12:28:27,964 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-21 12:28:27,966 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-21 12:28:27,967 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-21 12:28:27,988 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-21 12:28:27,988 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-21 12:28:27,990 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-21 12:28:27,991 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-21 12:28:27,991 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-21 12:28:27,991 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-21 12:28:27,991 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-21 12:28:27,991 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-21 12:28:27,992 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-21 12:28:27,992 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-21 12:28:27,992 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-21 12:28:27,995 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-21 12:28:27,995 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-21 12:28:27,996 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-21 12:28:27,996 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-21 12:28:27,996 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-21 12:28:27,996 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-21 12:28:27,996 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-21 12:28:27,997 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-21 12:28:27,997 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-21 12:28:27,997 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-21 12:28:27,997 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-21 12:28:27,997 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-21 12:28:27,997 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-21 12:28:27,999 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-21 12:28:28,000 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-21 12:28:28,000 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:28:28,000 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-21 12:28:28,000 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-21 12:28:28,001 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-21 12:28:28,002 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-21 12:28:28,002 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-21 12:28:28,002 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-21 12:28:28,002 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-21 12:28:28,003 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 -> 24b22c477e8a47eac290a2fc1c5b1e1aaa3a4fa4 [2018-10-21 12:28:28,099 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-21 12:28:28,135 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-21 12:28:28,141 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-21 12:28:28,144 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-21 12:28:28,145 INFO L276 PluginConnector]: CDTParser initialized [2018-10-21 12:28:28,146 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/../../../trunk/examples/svcomp/loops/n.c11_true-unreach-call_false-termination.i [2018-10-21 12:28:28,246 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f761bbaa0/409ef38a769446848e8850d734b5038d/FLAGc3b874529 [2018-10-21 12:28:28,966 INFO L298 CDTParser]: Found 1 translation units. [2018-10-21 12:28:28,967 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/n.c11_true-unreach-call_false-termination.i [2018-10-21 12:28:28,977 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f761bbaa0/409ef38a769446848e8850d734b5038d/FLAGc3b874529 [2018-10-21 12:28:28,998 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/data/f761bbaa0/409ef38a769446848e8850d734b5038d [2018-10-21 12:28:29,005 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-21 12:28:29,009 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-21 12:28:29,012 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-21 12:28:29,015 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-21 12:28:29,022 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-21 12:28:29,025 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,031 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45f860f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29, skipping insertion in model container [2018-10-21 12:28:29,033 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,052 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-21 12:28:29,100 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-21 12:28:29,366 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:28:29,370 INFO L189 MainTranslator]: Completed pre-run [2018-10-21 12:28:29,392 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-21 12:28:29,415 INFO L193 MainTranslator]: Completed translation [2018-10-21 12:28:29,416 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29 WrapperNode [2018-10-21 12:28:29,417 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-21 12:28:29,419 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-21 12:28:29,419 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-21 12:28:29,419 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-21 12:28:29,433 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,443 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,453 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-21 12:28:29,454 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-21 12:28:29,454 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-21 12:28:29,454 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-21 12:28:29,470 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,471 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,472 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,478 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,488 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,489 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... [2018-10-21 12:28:29,492 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-21 12:28:29,493 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-21 12:28:29,493 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-21 12:28:29,493 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-21 12:28:29,496 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-21 12:28:29,687 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-21 12:28:29,688 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-21 12:28:29,688 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-21 12:28:29,688 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-21 12:28:29,688 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-21 12:28:29,688 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-21 12:28:29,689 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-10-21 12:28:29,689 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-10-21 12:28:30,001 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-21 12:28:30,003 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:28:30 BoogieIcfgContainer [2018-10-21 12:28:30,003 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-21 12:28:30,006 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-21 12:28:30,006 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-21 12:28:30,013 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-21 12:28:30,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.10 12:28:29" (1/3) ... [2018-10-21 12:28:30,015 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bcb0362 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:28:30, skipping insertion in model container [2018-10-21 12:28:30,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.10 12:28:29" (2/3) ... [2018-10-21 12:28:30,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bcb0362 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.10 12:28:30, skipping insertion in model container [2018-10-21 12:28:30,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:28:30" (3/3) ... [2018-10-21 12:28:30,021 INFO L112 eAbstractionObserver]: Analyzing ICFG n.c11_true-unreach-call_false-termination.i [2018-10-21 12:28:30,040 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-21 12:28:30,057 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-21 12:28:30,112 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-21 12:28:30,215 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-10-21 12:28:30,219 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-21 12:28:30,224 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-21 12:28:30,224 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-21 12:28:30,224 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-21 12:28:30,224 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-21 12:28:30,224 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-21 12:28:30,225 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-21 12:28:30,225 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-21 12:28:30,253 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-10-21 12:28:30,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-10-21 12:28:30,269 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:28:30,271 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:28:30,278 INFO L424 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:28:30,293 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:28:30,294 INFO L82 PathProgramCache]: Analyzing trace with hash -2008095039, now seen corresponding path program 1 times [2018-10-21 12:28:30,299 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:28:30,379 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:30,380 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:28:30,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:30,381 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:28:30,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:28:30,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:30,465 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:28:30,466 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-10-21 12:28:30,466 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:28:30,473 INFO L460 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-10-21 12:28:30,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-10-21 12:28:30,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:28:30,497 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-10-21 12:28:30,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:28:30,535 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-10-21 12:28:30,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-10-21 12:28:30,538 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-10-21 12:28:30,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:28:30,552 INFO L225 Difference]: With dead ends: 33 [2018-10-21 12:28:30,553 INFO L226 Difference]: Without dead ends: 14 [2018-10-21 12:28:30,559 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-10-21 12:28:30,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-10-21 12:28:30,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-10-21 12:28:30,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-10-21 12:28:30,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-10-21 12:28:30,632 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-10-21 12:28:30,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:28:30,635 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-10-21 12:28:30,635 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-10-21 12:28:30,635 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-10-21 12:28:30,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-10-21 12:28:30,638 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:28:30,639 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:28:30,640 INFO L424 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:28:30,640 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:28:30,642 INFO L82 PathProgramCache]: Analyzing trace with hash 1715940768, now seen corresponding path program 1 times [2018-10-21 12:28:30,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:28:30,645 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:30,650 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:28:30,651 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:30,651 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:28:30,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:28:30,926 WARN L179 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-10-21 12:28:31,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:31,014 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-21 12:28:31,015 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-21 12:28:31,015 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-21 12:28:31,017 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-21 12:28:31,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-21 12:28:31,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-21 12:28:31,018 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2018-10-21 12:28:31,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:28:31,131 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-10-21 12:28:31,131 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-21 12:28:31,131 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-10-21 12:28:31,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:28:31,132 INFO L225 Difference]: With dead ends: 30 [2018-10-21 12:28:31,132 INFO L226 Difference]: Without dead ends: 18 [2018-10-21 12:28:31,134 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-21 12:28:31,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-21 12:28:31,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-10-21 12:28:31,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-10-21 12:28:31,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-10-21 12:28:31,139 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-10-21 12:28:31,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:28:31,140 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-10-21 12:28:31,140 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-21 12:28:31,141 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-10-21 12:28:31,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-10-21 12:28:31,141 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:28:31,142 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:28:31,142 INFO L424 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:28:31,142 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:28:31,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1048902920, now seen corresponding path program 1 times [2018-10-21 12:28:31,142 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:28:31,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:31,144 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:28:31,144 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:31,144 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:28:31,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:28:31,309 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:31,310 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:31,310 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:28:31,311 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-10-21 12:28:31,314 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [21], [28], [31], [33], [39], [40], [41], [43] [2018-10-21 12:28:31,370 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-21 12:28:31,370 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-21 12:28:31,489 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-10-21 12:28:31,853 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-21 12:28:31,855 INFO L272 AbstractInterpreter]: Visited 14 different actions 122 times. Merged at 5 different actions 60 times. Widened at 1 different actions 8 times. Found 1 fixpoints after 1 different actions. Largest state had 5 variables. [2018-10-21 12:28:31,865 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:28:31,866 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-21 12:28:31,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:31,867 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:28:31,879 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:28:31,879 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:28:31,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:28:31,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:28:32,055 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:32,056 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:28:32,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:32,415 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:32,415 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:28:32,432 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:28:32,432 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-21 12:28:32,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:28:32,451 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:28:32,520 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:32,520 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:28:32,530 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:32,532 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:28:32,532 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-10-21 12:28:32,533 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:28:32,533 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-21 12:28:32,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-21 12:28:32,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2018-10-21 12:28:32,534 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 6 states. [2018-10-21 12:28:32,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:28:32,621 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2018-10-21 12:28:32,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-21 12:28:32,622 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2018-10-21 12:28:32,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:28:32,623 INFO L225 Difference]: With dead ends: 34 [2018-10-21 12:28:32,623 INFO L226 Difference]: Without dead ends: 22 [2018-10-21 12:28:32,624 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-10-21 12:28:32,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-10-21 12:28:32,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-10-21 12:28:32,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-21 12:28:32,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-21 12:28:32,630 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-10-21 12:28:32,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:28:32,630 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-21 12:28:32,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-21 12:28:32,630 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-21 12:28:32,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-21 12:28:32,631 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:28:32,631 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:28:32,632 INFO L424 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:28:32,632 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:28:32,633 INFO L82 PathProgramCache]: Analyzing trace with hash 452778096, now seen corresponding path program 2 times [2018-10-21 12:28:32,633 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:28:32,634 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:32,635 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-21 12:28:32,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:32,635 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:28:32,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:28:32,899 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:32,900 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:32,900 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:28:32,900 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:28:32,901 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:28:32,901 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:32,901 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:28:32,916 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:28:32,916 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:28:32,954 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:28:32,954 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:28:32,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:28:33,043 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:33,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:28:33,189 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:33,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:33,211 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:28:33,227 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-10-21 12:28:33,228 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-10-21 12:28:33,250 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-10-21 12:28:33,251 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:28:33,256 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:28:33,470 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:33,470 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:28:33,527 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:33,533 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:28:33,533 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-10-21 12:28:33,534 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:28:33,534 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-21 12:28:33,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-21 12:28:33,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2018-10-21 12:28:33,535 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-10-21 12:28:33,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:28:33,692 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2018-10-21 12:28:33,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-21 12:28:33,692 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-10-21 12:28:33,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:28:33,694 INFO L225 Difference]: With dead ends: 42 [2018-10-21 12:28:33,695 INFO L226 Difference]: Without dead ends: 26 [2018-10-21 12:28:33,695 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 67 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2018-10-21 12:28:33,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-10-21 12:28:33,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2018-10-21 12:28:33,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-10-21 12:28:33,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2018-10-21 12:28:33,701 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 19 [2018-10-21 12:28:33,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:28:33,702 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2018-10-21 12:28:33,702 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-21 12:28:33,702 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2018-10-21 12:28:33,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-10-21 12:28:33,703 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:28:33,703 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:28:33,703 INFO L424 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:28:33,704 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:28:33,704 INFO L82 PathProgramCache]: Analyzing trace with hash -137838632, now seen corresponding path program 3 times [2018-10-21 12:28:33,704 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:28:33,706 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:33,706 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:28:33,707 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:33,707 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:28:33,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:28:33,903 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:33,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:33,904 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:28:33,904 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:28:33,904 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:28:33,904 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:33,905 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:28:33,917 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:28:33,917 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:28:33,946 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-21 12:28:33,946 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:28:33,949 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:28:34,052 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:34,053 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:28:34,294 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:34,315 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:34,315 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:28:34,331 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-21 12:28:34,332 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-21 12:28:34,384 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-10-21 12:28:34,384 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:28:34,389 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:28:34,425 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:34,426 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:28:34,510 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:34,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:28:34,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9, 8, 8] total 17 [2018-10-21 12:28:34,512 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:28:34,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-10-21 12:28:34,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-10-21 12:28:34,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2018-10-21 12:28:34,514 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 8 states. [2018-10-21 12:28:34,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:28:34,658 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2018-10-21 12:28:34,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-10-21 12:28:34,662 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2018-10-21 12:28:34,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:28:34,663 INFO L225 Difference]: With dead ends: 50 [2018-10-21 12:28:34,664 INFO L226 Difference]: Without dead ends: 30 [2018-10-21 12:28:34,664 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-10-21 12:28:34,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-21 12:28:34,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-10-21 12:28:34,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-10-21 12:28:34,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2018-10-21 12:28:34,671 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 23 [2018-10-21 12:28:34,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:28:34,672 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2018-10-21 12:28:34,672 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-10-21 12:28:34,672 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2018-10-21 12:28:34,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-10-21 12:28:34,673 INFO L367 BasicCegarLoop]: Found error trace [2018-10-21 12:28:34,673 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-21 12:28:34,675 INFO L424 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-21 12:28:34,675 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-21 12:28:34,675 INFO L82 PathProgramCache]: Analyzing trace with hash 872592192, now seen corresponding path program 4 times [2018-10-21 12:28:34,675 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-21 12:28:34,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:34,676 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-21 12:28:34,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-21 12:28:34,677 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-21 12:28:34,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-21 12:28:34,986 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:34,986 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:34,986 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-21 12:28:34,986 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-21 12:28:34,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-21 12:28:34,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:34,987 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-21 12:28:35,007 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:28:35,008 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:28:35,023 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:28:35,023 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:28:35,025 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:28:35,078 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:35,078 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:28:35,208 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:35,228 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-21 12:28:35,229 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-10-21 12:28:35,245 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-21 12:28:35,245 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-21 12:28:35,282 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-21 12:28:35,283 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-21 12:28:35,287 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-21 12:28:35,311 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:35,311 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-21 12:28:35,328 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-21 12:28:35,330 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-10-21 12:28:35,330 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-10-21 12:28:35,331 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-21 12:28:35,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-21 12:28:35,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-21 12:28:35,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2018-10-21 12:28:35,332 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2018-10-21 12:28:35,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-21 12:28:35,447 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2018-10-21 12:28:35,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-21 12:28:35,447 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2018-10-21 12:28:35,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-21 12:28:35,449 INFO L225 Difference]: With dead ends: 48 [2018-10-21 12:28:35,449 INFO L226 Difference]: Without dead ends: 0 [2018-10-21 12:28:35,450 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 97 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-10-21 12:28:35,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-10-21 12:28:35,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-10-21 12:28:35,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-10-21 12:28:35,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-10-21 12:28:35,451 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 27 [2018-10-21 12:28:35,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-21 12:28:35,451 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-10-21 12:28:35,451 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-21 12:28:35,451 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-10-21 12:28:35,452 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-10-21 12:28:35,457 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-10-21 12:28:35,569 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-10-21 12:28:35,570 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-10-21 12:28:35,570 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-10-21 12:28:35,570 INFO L428 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-10-21 12:28:35,570 INFO L428 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-10-21 12:28:35,571 INFO L425 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-10-21 12:28:35,571 INFO L428 ceAbstractionStarter]: At program point mainENTRY(lines 9 21) the Hoare annotation is: true [2018-10-21 12:28:35,571 INFO L425 ceAbstractionStarter]: For program point mainEXIT(lines 9 21) no Hoare annotation was computed. [2018-10-21 12:28:35,571 INFO L425 ceAbstractionStarter]: For program point L19(line 19) no Hoare annotation was computed. [2018-10-21 12:28:35,571 INFO L425 ceAbstractionStarter]: For program point L14(lines 14 15) no Hoare annotation was computed. [2018-10-21 12:28:35,571 INFO L425 ceAbstractionStarter]: For program point mainFINAL(lines 9 21) no Hoare annotation was computed. [2018-10-21 12:28:35,571 INFO L425 ceAbstractionStarter]: For program point L13-1(lines 13 18) no Hoare annotation was computed. [2018-10-21 12:28:35,571 INFO L425 ceAbstractionStarter]: For program point L14-2(lines 14 15) no Hoare annotation was computed. [2018-10-21 12:28:35,572 INFO L421 ceAbstractionStarter]: At program point L13-3(lines 13 18) the Hoare annotation is: (or (and (<= main_~len~0 0) (<= 0 main_~len~0)) (and (<= 4 main_~len~0) (<= main_~len~0 4)) (and (<= main_~len~0 2) (<= 2 main_~len~0)) (and (<= 1 main_~len~0) (<= main_~len~0 1)) (and (<= main_~len~0 3) (<= 3 main_~len~0))) [2018-10-21 12:28:35,572 INFO L421 ceAbstractionStarter]: At program point L13-4(lines 13 18) the Hoare annotation is: (or (and (<= main_~len~0 0) (<= 0 main_~len~0)) (and (<= 4 main_~len~0) (<= main_~len~0 4)) (and (<= main_~len~0 2) (<= 2 main_~len~0)) (and (<= 1 main_~len~0) (<= main_~len~0 1)) (and (<= main_~len~0 3) (<= 3 main_~len~0))) [2018-10-21 12:28:35,572 INFO L425 ceAbstractionStarter]: For program point L3-2(lines 2 7) no Hoare annotation was computed. [2018-10-21 12:28:35,572 INFO L428 ceAbstractionStarter]: At program point __VERIFIER_assertENTRY(lines 2 7) the Hoare annotation is: true [2018-10-21 12:28:35,572 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertEXIT(lines 2 7) no Hoare annotation was computed. [2018-10-21 12:28:35,573 INFO L425 ceAbstractionStarter]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 4) no Hoare annotation was computed. [2018-10-21 12:28:35,573 INFO L425 ceAbstractionStarter]: For program point L4(line 4) no Hoare annotation was computed. [2018-10-21 12:28:35,573 INFO L425 ceAbstractionStarter]: For program point L3(lines 3 5) no Hoare annotation was computed. [2018-10-21 12:28:35,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.10 12:28:35 BoogieIcfgContainer [2018-10-21 12:28:35,588 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-21 12:28:35,588 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-21 12:28:35,588 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-21 12:28:35,589 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-21 12:28:35,589 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.10 12:28:30" (3/4) ... [2018-10-21 12:28:35,593 INFO L144 WitnessPrinter]: Generating witness for correct program [2018-10-21 12:28:35,600 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2018-10-21 12:28:35,601 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2018-10-21 12:28:35,601 INFO L333 RCFGBacktranslator]: Ignoring RootEdge to procedure __VERIFIER_assert [2018-10-21 12:28:35,606 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2018-10-21 12:28:35,606 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2018-10-21 12:28:35,606 INFO L846 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2018-10-21 12:28:35,652 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UTaipan-linux/witness.graphml [2018-10-21 12:28:35,652 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-21 12:28:35,653 INFO L168 Benchmark]: Toolchain (without parser) took 6647.30 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.9 MB). Free memory was 953.2 MB in the beginning and 846.1 MB in the end (delta: 107.1 MB). Peak memory consumption was 257.1 MB. Max. memory is 11.5 GB. [2018-10-21 12:28:35,654 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:28:35,655 INFO L168 Benchmark]: CACSL2BoogieTranslator took 405.04 ms. Allocated memory is still 1.0 GB. Free memory was 953.2 MB in the beginning and 942.5 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-21 12:28:35,656 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.31 ms. Allocated memory is still 1.0 GB. Free memory is still 942.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:28:35,656 INFO L168 Benchmark]: Boogie Preprocessor took 38.74 ms. Allocated memory is still 1.0 GB. Free memory is still 942.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:28:35,656 INFO L168 Benchmark]: RCFGBuilder took 510.33 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.9 MB). Free memory was 942.5 MB in the beginning and 1.1 GB in the end (delta: -190.9 MB). Peak memory consumption was 26.5 MB. Max. memory is 11.5 GB. [2018-10-21 12:28:35,657 INFO L168 Benchmark]: TraceAbstraction took 5582.42 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 846.1 MB in the end (delta: 280.4 MB). Peak memory consumption was 280.4 MB. Max. memory is 11.5 GB. [2018-10-21 12:28:35,658 INFO L168 Benchmark]: Witness Printer took 63.94 ms. Allocated memory is still 1.2 GB. Free memory is still 846.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-21 12:28:35,663 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 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 405.04 ms. Allocated memory is still 1.0 GB. Free memory was 953.2 MB in the beginning and 942.5 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 34.31 ms. Allocated memory is still 1.0 GB. Free memory is still 942.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 38.74 ms. Allocated memory is still 1.0 GB. Free memory is still 942.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 510.33 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 149.9 MB). Free memory was 942.5 MB in the beginning and 1.1 GB in the end (delta: -190.9 MB). Peak memory consumption was 26.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5582.42 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 846.1 MB in the end (delta: 280.4 MB). Peak memory consumption was 280.4 MB. Max. memory is 11.5 GB. * Witness Printer took 63.94 ms. Allocated memory is still 1.2 GB. Free memory is still 846.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 4]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 13]: Loop Invariant Derived loop invariant: ((((len <= 0 && 0 <= len) || (4 <= len && len <= 4)) || (len <= 2 && 2 <= len)) || (1 <= len && len <= 1)) || (len <= 3 && 3 <= len) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. SAFE Result, 5.3s OverallTime, 6 OverallIterations, 5 TraceHistogramMax, 0.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.1s HoareAnnotationTime, HoareTripleCheckerStatistics: 99 SDtfs, 14 SDslu, 336 SDs, 0 SdLazy, 220 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 370 GetRequests, 298 SyntacticMatches, 17 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=29occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 4 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 17 PreInvPairs, 27 NumberOfFragments, 77 HoareAnnotationTreeSize, 17 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.9s InterpolantComputationTime, 273 NumberOfCodeBlocks, 273 NumberOfCodeBlocksAsserted, 24 NumberOfCheckSat, 419 ConstructedInterpolants, 0 QuantifiedInterpolants, 45165 SizeOfPredicates, 16 NumberOfNonLiveVariables, 312 ConjunctsInSsa, 105 ConjunctsInUnsatCore, 22 InterpolantComputations, 2 PerfectInterpolantSequences, 3/300 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...